diff --git a/sys/amd64/amd64/machdep.c b/sys/amd64/amd64/machdep.c index de5d4b7c4f10..2cf8d5f5ac6b 100644 --- a/sys/amd64/amd64/machdep.c +++ b/sys/amd64/amd64/machdep.c @@ -1,1530 +1,1540 @@ /*- * Copyright (c) 1992 Terrence R. Lambert. * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 - * $Id: machdep.c,v 1.207 1996/10/05 10:44:03 jkh Exp $ + * $Id: machdep.c,v 1.208 1996/10/20 18:35:32 phk Exp $ */ #include "npx.h" #include "opt_sysvipc.h" #include "opt_ddb.h" #include "opt_bounce.h" #include "opt_machdep.h" #include "opt_perfmon.h" #include "opt_userconfig.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef SYSVSHM #include #endif #ifdef SYSVMSG #include #endif #ifdef SYSVSEM #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef PERFMON #include #endif #include #include #include extern void init386 __P((int first)); extern int ptrace_set_pc __P((struct proc *p, unsigned int addr)); extern int ptrace_single_step __P((struct proc *p)); extern int ptrace_write_u __P((struct proc *p, vm_offset_t off, int data)); extern void dblfault_handler __P((void)); extern void identifycpu(void); /* XXX header file */ extern void earlysetcpuclass(void); /* same header file */ static void cpu_startup __P((void *)); SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) #ifdef BOUNCE_BUFFERS extern char *bouncememory; extern int maxbkva; #ifdef BOUNCEPAGES int bouncepages = BOUNCEPAGES; #else int bouncepages = 0; #endif #endif /* BOUNCE_BUFFERS */ extern int freebufspace; int msgbufmapped = 0; /* set when safe to use msgbuf */ int _udatasel, _ucodesel; u_int atdevbase; int physmem = 0; int cold = 1; static int sysctl_hw_physmem SYSCTL_HANDLER_ARGS { int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); return (error); } SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_hw_physmem, "I", ""); static int sysctl_hw_usermem SYSCTL_HANDLER_ARGS { int error = sysctl_handle_int(oidp, 0, ctob(physmem - cnt.v_wire_count), req); return (error); } SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_hw_usermem, "I", ""); int boothowto = 0, bootverbose = 0, Maxmem = 0; static int badpages = 0; long dumplo; extern int bootdev; vm_offset_t phys_avail[10]; /* must be 2 less so 0 0 can signal end of chunks */ #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) static void setup_netisrs __P((struct linker_set *)); /* XXX declare elsewhere */ static vm_offset_t buffer_sva, buffer_eva; vm_offset_t clean_sva, clean_eva; static vm_offset_t pager_sva, pager_eva; extern struct linker_set netisr_set; #define offsetof(type, member) ((size_t)(&((type *)0)->member)) static void cpu_startup(dummy) void *dummy; { register unsigned i; register caddr_t v; vm_offset_t maxaddr; vm_size_t size = 0; int firstaddr; vm_offset_t minaddr; if (boothowto & RB_VERBOSE) bootverbose++; /* * Initialize error message buffer (at end of core). */ /* avail_end was pre-decremented in init386() to compensate */ for (i = 0; i < btoc(sizeof (struct msgbuf)); i++) pmap_enter(pmap_kernel(), (vm_offset_t)msgbufp, avail_end + i * PAGE_SIZE, VM_PROT_ALL, TRUE); msgbufmapped = 1; /* * Good {morning,afternoon,evening,night}. */ printf(version); earlysetcpuclass(); startrtclock(); identifycpu(); #ifdef PERFMON perfmon_init(); #endif printf("real memory = %d (%dK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); /* * Display any holes after the first chunk of extended memory. */ if (badpages != 0) { int indx = 1; /* * XXX skip reporting ISA hole & unmanaged kernel memory */ if (phys_avail[0] == PAGE_SIZE) indx += 2; printf("Physical memory hole(s):\n"); for (; phys_avail[indx + 1] != 0; indx += 2) { int size = phys_avail[indx + 1] - phys_avail[indx]; printf("0x%08lx - 0x%08lx, %d bytes (%d pages)\n", phys_avail[indx], phys_avail[indx + 1] - 1, size, size / PAGE_SIZE); } } /* * Quickly wire in netisrs. */ setup_netisrs(&netisr_set); /* * Allocate space for system data structures. * The first available kernel virtual address is in "v". * As pages of kernel virtual memory are allocated, "v" is incremented. * As pages of memory are allocated and cleared, * "firstaddr" is incremented. * An index into the kernel page table corresponding to the * virtual memory address maintained in "v" is kept in "mapaddr". */ /* * Make two passes. The first pass calculates how much memory is * needed and allocates it. The second pass assigns virtual * addresses to the various data structures. */ firstaddr = 0; again: v = (caddr_t)firstaddr; #define valloc(name, type, num) \ (name) = (type *)v; v = (caddr_t)((name)+(num)) #define valloclim(name, type, num, lim) \ (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) valloc(callout, struct callout, ncallout); #ifdef SYSVSHM valloc(shmsegs, struct shmid_ds, shminfo.shmmni); #endif #ifdef SYSVSEM valloc(sema, struct semid_ds, seminfo.semmni); valloc(sem, struct sem, seminfo.semmns); /* This is pretty disgusting! */ valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); #endif #ifdef SYSVMSG valloc(msgpool, char, msginfo.msgmax); valloc(msgmaps, struct msgmap, msginfo.msgseg); valloc(msghdrs, struct msg, msginfo.msgtql); valloc(msqids, struct msqid_ds, msginfo.msgmni); #endif if (nbuf == 0) { nbuf = 30; if( physmem > 1024) nbuf += min((physmem - 1024) / 12, 1024); } nswbuf = min(nbuf, 128); valloc(swbuf, struct buf, nswbuf); valloc(buf, struct buf, nbuf); #ifdef BOUNCE_BUFFERS /* * If there is more than 16MB of memory, allocate some bounce buffers */ if (Maxmem > 4096) { if (bouncepages == 0) { bouncepages = 64; bouncepages += ((Maxmem - 4096) / 2048) * 32; } v = (caddr_t)((vm_offset_t)round_page(v)); valloc(bouncememory, char, bouncepages * PAGE_SIZE); } #endif /* * End of first pass, size has been calculated so allocate memory */ if (firstaddr == 0) { size = (vm_size_t)(v - firstaddr); firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); if (firstaddr == 0) panic("startup: no room for tables"); goto again; } /* * End of second pass, addresses have been assigned */ if ((vm_size_t)(v - firstaddr) != size) panic("startup: table size inconsistency"); #ifdef BOUNCE_BUFFERS clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + maxbkva + pager_map_size, TRUE); io_map = kmem_suballoc(clean_map, &minaddr, &maxaddr, maxbkva, FALSE); #else clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + pager_map_size, TRUE); #endif buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, (nbuf*MAXBSIZE), TRUE); pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, (nswbuf*MAXPHYS) + pager_map_size, TRUE); exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, (16*ARG_MAX), TRUE); exech_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, (32*ARG_MAX), TRUE); u_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, (maxproc*UPAGES*PAGE_SIZE), FALSE); /* * Finally, allocate mbuf pool. Since mclrefcnt is an off-size * we use the more space efficient malloc in place of kmem_alloc. */ mclrefcnt = (char *)malloc(nmbclusters+PAGE_SIZE/MCLBYTES, M_MBUF, M_NOWAIT); bzero(mclrefcnt, nmbclusters+PAGE_SIZE/MCLBYTES); mcl_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, nmbclusters * MCLBYTES, FALSE); { vm_size_t mb_map_size; mb_map_size = nmbufs * MSIZE; mb_map = kmem_suballoc(kmem_map, &minaddr, &maxaddr, round_page(mb_map_size), FALSE); } /* * Initialize callouts */ callfree = callout; for (i = 1; i < ncallout; i++) callout[i-1].c_next = &callout[i]; #if defined(USERCONFIG_BOOT) && defined(USERCONFIG) boothowto |= RB_CONFIG; #endif if (boothowto & RB_CONFIG) { #ifdef USERCONFIG userconfig(); cninit(); /* the preferred console may have changed */ #else printf("Sorry! no userconfig in this kernel\n"); #endif } #ifdef BOUNCE_BUFFERS /* * init bounce buffers */ vm_bounce_init(); #endif printf("avail memory = %d (%dK bytes)\n", ptoa(cnt.v_free_count), ptoa(cnt.v_free_count) / 1024); /* * Set up buffers, so they can be used to read disk labels. */ bufinit(); vm_pager_bufferinit(); /* * In verbose mode, print out the BIOS's idea of the disk geometries. */ if (bootverbose) { printf("BIOS Geometries:\n"); for (i = 0; i < N_BIOS_GEOM; i++) { unsigned long bios_geom; int max_cylinder, max_head, max_sector; bios_geom = bootinfo.bi_bios_geom[i]; /* * XXX the bootstrap punts a 1200K floppy geometry * when the get-disk-geometry interrupt fails. Skip * drives that have this geometry. */ if (bios_geom == 0x4f010f) continue; printf(" %x:%08lx ", i, bios_geom); max_cylinder = bios_geom >> 16; max_head = (bios_geom >> 8) & 0xff; max_sector = bios_geom & 0xff; printf( "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n", max_cylinder, max_cylinder + 1, max_head, max_head + 1, max_sector, max_sector); } printf(" %d accounted for\n", bootinfo.bi_n_bios_used); } } int register_netisr(num, handler) int num; netisr_t *handler; { if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { printf("register_netisr: bad isr number: %d\n", num); return (EINVAL); } netisrs[num] = handler; return (0); } static void setup_netisrs(ls) struct linker_set *ls; { int i; const struct netisrtab *nit; for(i = 0; ls->ls_items[i]; i++) { nit = (const struct netisrtab *)ls->ls_items[i]; register_netisr(nit->nit_num, nit->nit_isr); } } /* * Send an interrupt to process. * * Stack is set up to allow sigcode stored * at top to call routine, followed by kcall * to sigreturn routine below. After sigreturn * resets the signal mask, the stack, and the * frame pointer, it returns to the user * specified pc, psl. */ void sendsig(catcher, sig, mask, code) sig_t catcher; int sig, mask; u_long code; { register struct proc *p = curproc; register int *regs; register struct sigframe *fp; struct sigframe sf; struct sigacts *psp = p->p_sigacts; int oonstack; regs = p->p_md.md_regs; oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; /* * Allocate and validate space for the signal handler context. */ if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && (psp->ps_sigonstack & sigmask(sig))) { fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + psp->ps_sigstk.ss_size - sizeof(struct sigframe)); psp->ps_sigstk.ss_flags |= SS_ONSTACK; } else { fp = (struct sigframe *)regs[tESP] - 1; } /* * grow() will return FALSE if the fp will not fit inside the stack * and the stack can not be grown. useracc will return FALSE * if access is denied. */ if ((grow(p, (int)fp) == FALSE) || (useracc((caddr_t)fp, sizeof (struct sigframe), B_WRITE) == FALSE)) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ SIGACTION(p, SIGILL) = SIG_DFL; sig = sigmask(SIGILL); p->p_sigignore &= ~sig; p->p_sigcatch &= ~sig; p->p_sigmask &= ~sig; psignal(p, SIGILL); return; } /* * Build the argument list for the signal handler. */ if (p->p_sysent->sv_sigtbl) { if (sig < p->p_sysent->sv_sigsize) sig = p->p_sysent->sv_sigtbl[sig]; else sig = p->p_sysent->sv_sigsize + 1; } sf.sf_signum = sig; sf.sf_code = code; sf.sf_scp = &fp->sf_sc; sf.sf_addr = (char *) regs[tERR]; sf.sf_handler = catcher; /* save scratch registers */ sf.sf_sc.sc_eax = regs[tEAX]; sf.sf_sc.sc_ebx = regs[tEBX]; sf.sf_sc.sc_ecx = regs[tECX]; sf.sf_sc.sc_edx = regs[tEDX]; sf.sf_sc.sc_esi = regs[tESI]; sf.sf_sc.sc_edi = regs[tEDI]; sf.sf_sc.sc_cs = regs[tCS]; sf.sf_sc.sc_ds = regs[tDS]; sf.sf_sc.sc_ss = regs[tSS]; sf.sf_sc.sc_es = regs[tES]; sf.sf_sc.sc_isp = regs[tISP]; /* * Build the signal context to be used by sigreturn. */ sf.sf_sc.sc_onstack = oonstack; sf.sf_sc.sc_mask = mask; sf.sf_sc.sc_sp = regs[tESP]; sf.sf_sc.sc_fp = regs[tEBP]; sf.sf_sc.sc_pc = regs[tEIP]; sf.sf_sc.sc_ps = regs[tEFLAGS]; /* * Copy the sigframe out to the user's stack. */ if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { /* * Something is wrong with the stack pointer. * ...Kill the process. */ sigexit(p, SIGILL); }; regs[tESP] = (int)fp; regs[tEIP] = (int)(((char *)PS_STRINGS) - *(p->p_sysent->sv_szsigcode)); regs[tEFLAGS] &= ~PSL_VM; regs[tCS] = _ucodesel; regs[tDS] = _udatasel; regs[tES] = _udatasel; regs[tSS] = _udatasel; } /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by sendsig (above). * Return to previous pc and psl as specified by * context left by sendsig. Check carefully to * make sure that the user has not modified the * state to gain improper privileges. */ int sigreturn(p, uap, retval) struct proc *p; struct sigreturn_args /* { struct sigcontext *sigcntxp; } */ *uap; int *retval; { register struct sigcontext *scp; register struct sigframe *fp; register int *regs = p->p_md.md_regs; int eflags; /* * (XXX old comment) regs[tESP] points to the return address. * The user scp pointer is above that. * The return address is faked in the signal trampoline code * for consistency. */ scp = uap->sigcntxp; fp = (struct sigframe *) ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); if (useracc((caddr_t)fp, sizeof (*fp), 0) == 0) return(EINVAL); /* * Don't allow users to change privileged or reserved flags. */ #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) eflags = scp->sc_ps; /* * XXX do allow users to change the privileged flag PSL_RF. The * cpu sets PSL_RF in tf_eflags for faults. Debuggers should * sometimes set it there too. tf_eflags is kept in the signal * context during signal handling and there is no other place * to remember it, so the PSL_RF bit may be corrupted by the * signal handler without us knowing. Corruption of the PSL_RF * bit at worst causes one more or one less debugger trap, so * allowing it is fairly harmless. */ if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs[tEFLAGS] & ~PSL_RF)) { #ifdef DEBUG printf("sigreturn: eflags = 0x%x\n", eflags); #endif return(EINVAL); } /* * Don't allow users to load a valid privileged %cs. Let the * hardware check for invalid selectors, excess privilege in * other selectors, invalid %eip's and invalid %esp's. */ #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) if (!CS_SECURE(scp->sc_cs)) { #ifdef DEBUG printf("sigreturn: cs = 0x%x\n", scp->sc_cs); #endif trapsignal(p, SIGBUS, T_PROTFLT); return(EINVAL); } /* restore scratch registers */ regs[tEAX] = scp->sc_eax; regs[tEBX] = scp->sc_ebx; regs[tECX] = scp->sc_ecx; regs[tEDX] = scp->sc_edx; regs[tESI] = scp->sc_esi; regs[tEDI] = scp->sc_edi; regs[tCS] = scp->sc_cs; regs[tDS] = scp->sc_ds; regs[tES] = scp->sc_es; regs[tSS] = scp->sc_ss; regs[tISP] = scp->sc_isp; if (useracc((caddr_t)scp, sizeof (*scp), 0) == 0) return(EINVAL); if (scp->sc_onstack & 01) p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; else p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; p->p_sigmask = scp->sc_mask &~ (sigmask(SIGKILL)|sigmask(SIGCONT)|sigmask(SIGSTOP)); regs[tEBP] = scp->sc_fp; regs[tESP] = scp->sc_sp; regs[tEIP] = scp->sc_pc; regs[tEFLAGS] = eflags; return(EJUSTRETURN); } /* * Machine depdnetnt boot() routine * * I haven't seen anything too put here yet * Possibly some stuff might be grafted back here from boot() */ void cpu_boot(int howto) { } +/* + * Shutdown the CPU as much as possible + */ +void +cpu_halt(void) +{ + for (;;) + __asm__ ("hlt"); +} + /* * Clear registers on exec */ void setregs(p, entry, stack) struct proc *p; u_long entry; u_long stack; { int *regs = p->p_md.md_regs; #ifdef USER_LDT struct pcb *pcb = &p->p_addr->u_pcb; /* was i386_user_cleanup() in NetBSD */ if (pcb->pcb_ldt) { if (pcb == curpcb) lldt(GSEL(GUSERLDT_SEL, SEL_KPL)); kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, pcb->pcb_ldt_len * sizeof(union descriptor)); pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; } #endif bzero(regs, sizeof(struct trapframe)); regs[tEIP] = entry; regs[tESP] = stack; regs[tEFLAGS] = PSL_USER | (regs[tEFLAGS] & PSL_T); regs[tSS] = _udatasel; regs[tDS] = _udatasel; regs[tES] = _udatasel; regs[tCS] = _ucodesel; p->p_addr->u_pcb.pcb_flags = 0; /* no fp at all */ load_cr0(rcr0() | CR0_TS); /* start emulating */ #if NNPX > 0 npxinit(__INITIAL_NPXCW__); #endif /* NNPX > 0 */ } static int sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS { int error; error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); if (!error && req->newptr) resettodr(); return (error); } SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, CTLFLAG_RW, &disable_rtc_set, 0, ""); SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, CTLFLAG_RD, &bootinfo, bootinfo, ""); SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, CTLFLAG_RW, &wall_cmos_clock, 0, ""); /* * Initialize 386 and configure to run kernel */ /* * Initialize segments & interrupt table */ int currentldt; int _default_ldt; union descriptor gdt[NGDT]; /* global descriptor table */ struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ union descriptor ldt[NLDT]; /* local descriptor table */ static struct i386tss dblfault_tss; static char dblfault_stack[PAGE_SIZE]; extern struct user *proc0paddr; /* software prototypes -- in more palatable form */ struct soft_segment_descriptor gdt_segs[] = { /* GNULL_SEL 0 Null Descriptor */ { 0x0, /* segment base address */ 0x0, /* length */ 0, /* segment type */ 0, /* segment descriptor priority level */ 0, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GCODE_SEL 1 Code Descriptor for kernel */ { 0x0, /* segment base address */ 0xfffff, /* length - all address space */ SDT_MEMERA, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, /* GDATA_SEL 2 Data Descriptor for kernel */ { 0x0, /* segment base address */ 0xfffff, /* length - all address space */ SDT_MEMRWA, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, /* GLDT_SEL 3 LDT Descriptor */ { (int) ldt, /* segment base address */ sizeof(ldt)-1, /* length - all address space */ SDT_SYSLDT, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 0, /* unused - default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GTGATE_SEL 4 Null Descriptor - Placeholder */ { 0x0, /* segment base address */ 0x0, /* length - all address space */ 0, /* segment type */ 0, /* segment descriptor priority level */ 0, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GPANIC_SEL 5 Panic Tss Descriptor */ { (int) &dblfault_tss, /* segment base address */ sizeof(struct i386tss)-1,/* length - all address space */ SDT_SYS386TSS, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 0, /* unused - default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GPROC0_SEL 6 Proc 0 Tss Descriptor */ { (int) kstack, /* segment base address */ sizeof(struct i386tss)-1,/* length - all address space */ SDT_SYS386TSS, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 0, /* unused - default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GUSERLDT_SEL 7 User LDT Descriptor per process */ { (int) ldt, /* segment base address */ (512 * sizeof(union descriptor)-1), /* length */ SDT_SYSLDT, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 0, /* unused - default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ { 0, /* segment base address (overwritten by APM) */ 0xfffff, /* length */ SDT_MEMERA, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, /* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ { 0, /* segment base address (overwritten by APM) */ 0xfffff, /* length */ SDT_MEMERA, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, /* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ { 0, /* segment base address (overwritten by APM) */ 0xfffff, /* length */ SDT_MEMRWA, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, }; static struct soft_segment_descriptor ldt_segs[] = { /* Null Descriptor - overwritten by call gate */ { 0x0, /* segment base address */ 0x0, /* length - all address space */ 0, /* segment type */ 0, /* segment descriptor priority level */ 0, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* Null Descriptor - overwritten by call gate */ { 0x0, /* segment base address */ 0x0, /* length - all address space */ 0, /* segment type */ 0, /* segment descriptor priority level */ 0, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* Null Descriptor - overwritten by call gate */ { 0x0, /* segment base address */ 0x0, /* length - all address space */ 0, /* segment type */ 0, /* segment descriptor priority level */ 0, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* Code Descriptor for user */ { 0x0, /* segment base address */ 0xfffff, /* length - all address space */ SDT_MEMERA, /* segment type */ SEL_UPL, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, /* Data Descriptor for user */ { 0x0, /* segment base address */ 0xfffff, /* length - all address space */ SDT_MEMRWA, /* segment type */ SEL_UPL, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, }; void setidt(idx, func, typ, dpl, selec) int idx; inthand_t *func; int typ; int dpl; int selec; { struct gate_descriptor *ip = idt + idx; ip->gd_looffset = (int)func; ip->gd_selector = selec; ip->gd_stkcpy = 0; ip->gd_xx = 0; ip->gd_type = typ; ip->gd_dpl = dpl; ip->gd_p = 1; ip->gd_hioffset = ((int)func)>>16 ; } #define IDTVEC(name) __CONCAT(X,name) extern inthand_t IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), IDTVEC(syscall), IDTVEC(int0x80_syscall); void sdtossd(sd, ssd) struct segment_descriptor *sd; struct soft_segment_descriptor *ssd; { ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; ssd->ssd_type = sd->sd_type; ssd->ssd_dpl = sd->sd_dpl; ssd->ssd_p = sd->sd_p; ssd->ssd_def32 = sd->sd_def32; ssd->ssd_gran = sd->sd_gran; } void init386(first) int first; { int x; unsigned biosbasemem, biosextmem; struct gate_descriptor *gdp; int gsel_tss; /* table descriptors - used to load tables by microp */ struct region_descriptor r_gdt, r_idt; int pagesinbase, pagesinext; int target_page, pa_indx; proc0.p_addr = proc0paddr; atdevbase = ISA_HOLE_START + KERNBASE; /* * Initialize the console before we print anything out. */ cninit(); /* * make gdt memory segments, the code segment goes up to end of the * page with etext in it, the data segment goes to the end of * the address space */ /* * XXX text protection is temporarily (?) disabled. The limit was * i386_btop(round_page(etext)) - 1. */ gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; for (x = 0; x < NGDT; x++) ssdtosd(&gdt_segs[x], &gdt[x].sd); /* make ldt memory segments */ /* * The data segment limit must not cover the user area because we * don't want the user area to be writable in copyout() etc. (page * level protection is lost in kernel mode on 386's). Also, we * don't want the user area to be writable directly (page level * protection of the user area is not available on 486's with * CR0_WP set, because there is no user-read/kernel-write mode). * * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it * should be spelled ...MAX_USER... */ #define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS /* * The code segment limit has to cover the user area until we move * the signal trampoline out of the user area. This is safe because * the code segment cannot be written to directly. */ #define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; /* Note. eventually want private ldts per process */ for (x = 0; x < NLDT; x++) ssdtosd(&ldt_segs[x], &ldt[x].sd); /* exceptions */ for (x = 0; x < NIDT; x++) setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(14, &IDTVEC(page), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(0x80, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); #include "isa.h" #if NISA >0 isa_defaultirq(); #endif rand_initialize(); r_gdt.rd_limit = sizeof(gdt) - 1; r_gdt.rd_base = (int) gdt; lgdt(&r_gdt); r_idt.rd_limit = sizeof(idt) - 1; r_idt.rd_base = (int) idt; lidt(&r_idt); _default_ldt = GSEL(GLDT_SEL, SEL_KPL); lldt(_default_ldt); currentldt = _default_ldt; #ifdef DDB kdb_init(); if (boothowto & RB_KDB) Debugger("Boot flags requested debugger"); #endif /* Use BIOS values stored in RTC CMOS RAM, since probing * breaks certain 386 AT relics. */ biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); /* * If BIOS tells us that it has more than 640k in the basemem, * don't believe it - set it to 640k. */ if (biosbasemem > 640) { printf("Preposterous RTC basemem of %dK, truncating to 640K\n", biosbasemem); biosbasemem = 640; } if (bootinfo.bi_memsizes_valid && bootinfo.bi_basemem > 640) { printf("Preposterous BIOS basemem of %dK, truncating to 640K\n", bootinfo.bi_basemem); bootinfo.bi_basemem = 640; } /* * Warn if the official BIOS interface disagrees with the RTC * interface used above about the amount of base memory or the * amount of extended memory. Prefer the BIOS value for the base * memory. This is necessary for machines that `steal' base * memory for use as BIOS memory, at least if we are going to use * the BIOS for apm. Prefer the RTC value for extended memory. * Eventually the hackish interface shouldn't even be looked at. */ if (bootinfo.bi_memsizes_valid) { if (bootinfo.bi_basemem != biosbasemem) { vm_offset_t pa; printf( "BIOS basemem (%ldK) != RTC basemem (%dK), setting to BIOS value\n", bootinfo.bi_basemem, biosbasemem); biosbasemem = bootinfo.bi_basemem; /* * XXX if biosbasemem is now < 640, there is `hole' * between the end of base memory and the start of * ISA memory. The hole may be empty or it may * contain BIOS code or data. Map it read/write so * that the BIOS can write to it. (Memory from 0 to * the physical end of the kernel is mapped read-only * to begin with and then parts of it are remapped. * The parts that aren't remapped form holes that * remain read-only and are unused by the kernel. * The base memory area is below the physical end of * the kernel and right now forms a read-only hole. * The part of it from 0 to * (trunc_page(biosbasemem * 1024) - 1) will be * remapped and used by the kernel later.) * * This code is similar to the code used in * pmap_mapdev, but since no memory needs to be * allocated we simply change the mapping. */ for (pa = trunc_page(biosbasemem * 1024); pa < ISA_HOLE_START; pa += PAGE_SIZE) { unsigned *pte; pte = (unsigned *)vtopte(pa + KERNBASE); *pte = pa | PG_RW | PG_V; } } if (bootinfo.bi_extmem != biosextmem) printf("BIOS extmem (%ldK) != RTC extmem (%dK)\n", bootinfo.bi_extmem, biosextmem); } pagesinbase = biosbasemem * 1024 / PAGE_SIZE; pagesinext = biosextmem * 1024 / PAGE_SIZE; /* * Special hack for chipsets that still remap the 384k hole when * there's 16MB of memory - this really confuses people that * are trying to use bus mastering ISA controllers with the * "16MB limit"; they only have 16MB, but the remapping puts * them beyond the limit. */ /* * If extended memory is between 15-16MB (16-17MB phys address range), * chop it to 15MB. */ if ((pagesinext > 3840) && (pagesinext < 4096)) pagesinext = 3840; /* * Maxmem isn't the "maximum memory", it's one larger than the * highest page of the physical address space. It should be * called something like "Maxphyspage". */ Maxmem = pagesinext + 0x100000/PAGE_SIZE; #ifdef MAXMEM Maxmem = MAXMEM/4; #endif /* call pmap initialization to make new kernel address space */ pmap_bootstrap (first, 0); /* * Size up each available chunk of physical memory. */ /* * We currently don't bother testing base memory. * XXX ...but we probably should. */ pa_indx = 0; badpages = 0; if (pagesinbase > 1) { phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ physmem = pagesinbase - 1; } else { /* point at first chunk end */ pa_indx++; } for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { int tmp, page_bad = FALSE; /* * map page into kernel: valid, read/write, non-cacheable */ *(int *)CMAP1 = PG_V | PG_RW | PG_N | target_page; invltlb(); tmp = *(int *)CADDR1; /* * Test for alternating 1's and 0's */ *(volatile int *)CADDR1 = 0xaaaaaaaa; if (*(volatile int *)CADDR1 != 0xaaaaaaaa) { page_bad = TRUE; } /* * Test for alternating 0's and 1's */ *(volatile int *)CADDR1 = 0x55555555; if (*(volatile int *)CADDR1 != 0x55555555) { page_bad = TRUE; } /* * Test for all 1's */ *(volatile int *)CADDR1 = 0xffffffff; if (*(volatile int *)CADDR1 != 0xffffffff) { page_bad = TRUE; } /* * Test for all 0's */ *(volatile int *)CADDR1 = 0x0; if (*(volatile int *)CADDR1 != 0x0) { /* * test of page failed */ page_bad = TRUE; } /* * Restore original value. */ *(int *)CADDR1 = tmp; /* * Adjust array of valid/good pages. */ if (page_bad == FALSE) { /* * If this good page is a continuation of the * previous set of good pages, then just increase * the end pointer. Otherwise start a new chunk. * Note that "end" points one higher than end, * making the range >= start and < end. */ if (phys_avail[pa_indx] == target_page) { phys_avail[pa_indx] += PAGE_SIZE; } else { pa_indx++; if (pa_indx == PHYS_AVAIL_ARRAY_END) { printf("Too many holes in the physical address space, giving up\n"); pa_indx--; break; } phys_avail[pa_indx++] = target_page; /* start */ phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ } physmem++; } else { badpages++; page_bad = FALSE; } } *(int *)CMAP1 = 0; invltlb(); /* * XXX * The last chunk must contain at least one page plus the message * buffer to avoid complicating other code (message buffer address * calculation, etc.). */ while (phys_avail[pa_indx - 1] + PAGE_SIZE + round_page(sizeof(struct msgbuf)) >= phys_avail[pa_indx]) { physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); phys_avail[pa_indx--] = 0; phys_avail[pa_indx--] = 0; } Maxmem = atop(phys_avail[pa_indx]); /* Trim off space for the message buffer. */ phys_avail[pa_indx] -= round_page(sizeof(struct msgbuf)); avail_end = phys_avail[pa_indx]; /* now running on new page tables, configured,and u/iom is accessible */ /* make a initial tss so microp can get interrupt stack on syscall! */ proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*PAGE_SIZE; proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); dblfault_tss.tss_cr3 = IdlePTD; dblfault_tss.tss_eip = (int) dblfault_handler; dblfault_tss.tss_eflags = PSL_KERNEL; dblfault_tss.tss_ds = dblfault_tss.tss_es = dblfault_tss.tss_fs = dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); ((struct i386tss *)gdt_segs[GPROC0_SEL].ssd_base)->tss_ioopt = (sizeof(struct i386tss))<<16; ltr(gsel_tss); /* make a call gate to reenter kernel with */ gdp = &ldt[LSYS5CALLS_SEL].gd; x = (int) &IDTVEC(syscall); gdp->gd_looffset = x++; gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); gdp->gd_stkcpy = 1; gdp->gd_type = SDT_SYS386CGT; gdp->gd_dpl = SEL_UPL; gdp->gd_p = 1; gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; /* XXX does this work? */ ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; /* transfer to user mode */ _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); _udatasel = LSEL(LUDATA_SEL, SEL_UPL); /* setup proc 0's pcb */ proc0.p_addr->u_pcb.pcb_flags = 0; proc0.p_addr->u_pcb.pcb_cr3 = IdlePTD; } /* * The registers are in the frame; the frame is in the user area of * the process in question; when the process is active, the registers * are in "the kernel stack"; when it's not, they're still there, but * things get flipped around. So, since p->p_md.md_regs is the whole address * of the register set, take its offset from the kernel stack, and * index into the user block. Don't you just *love* virtual memory? * (I'm starting to think seymour is right...) */ #define TF_REGP(p) ((struct trapframe *) \ ((char *)(p)->p_addr \ + ((char *)(p)->p_md.md_regs - kstack))) int ptrace_set_pc(p, addr) struct proc *p; unsigned int addr; { TF_REGP(p)->tf_eip = addr; return (0); } int ptrace_single_step(p) struct proc *p; { TF_REGP(p)->tf_eflags |= PSL_T; return (0); } int ptrace_write_u(p, off, data) struct proc *p; vm_offset_t off; int data; { struct trapframe frame_copy; vm_offset_t min; struct trapframe *tp; /* * Privileged kernel state is scattered all over the user area. * Only allow write access to parts of regs and to fpregs. */ min = (char *)p->p_md.md_regs - kstack; if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { tp = TF_REGP(p); frame_copy = *tp; *(int *)((char *)&frame_copy + (off - min)) = data; if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || !CS_SECURE(frame_copy.tf_cs)) return (EINVAL); *(int*)((char *)p->p_addr + off) = data; return (0); } min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { *(int*)((char *)p->p_addr + off) = data; return (0); } return (EFAULT); } int fill_regs(p, regs) struct proc *p; struct reg *regs; { struct trapframe *tp; tp = TF_REGP(p); regs->r_es = tp->tf_es; regs->r_ds = tp->tf_ds; regs->r_edi = tp->tf_edi; regs->r_esi = tp->tf_esi; regs->r_ebp = tp->tf_ebp; regs->r_ebx = tp->tf_ebx; regs->r_edx = tp->tf_edx; regs->r_ecx = tp->tf_ecx; regs->r_eax = tp->tf_eax; regs->r_eip = tp->tf_eip; regs->r_cs = tp->tf_cs; regs->r_eflags = tp->tf_eflags; regs->r_esp = tp->tf_esp; regs->r_ss = tp->tf_ss; return (0); } int set_regs(p, regs) struct proc *p; struct reg *regs; { struct trapframe *tp; tp = TF_REGP(p); if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || !CS_SECURE(regs->r_cs)) return (EINVAL); tp->tf_es = regs->r_es; tp->tf_ds = regs->r_ds; tp->tf_edi = regs->r_edi; tp->tf_esi = regs->r_esi; tp->tf_ebp = regs->r_ebp; tp->tf_ebx = regs->r_ebx; tp->tf_edx = regs->r_edx; tp->tf_ecx = regs->r_ecx; tp->tf_eax = regs->r_eax; tp->tf_eip = regs->r_eip; tp->tf_cs = regs->r_cs; tp->tf_eflags = regs->r_eflags; tp->tf_esp = regs->r_esp; tp->tf_ss = regs->r_ss; return (0); } #ifndef DDB void Debugger(const char *msg) { printf("Debugger(\"%s\") called.\n", msg); } #endif /* no DDB */ #include #define b_cylin b_resid /* * Determine the size of the transfer, and make sure it is * within the boundaries of the partition. Adjust transfer * if needed, and signal errors or early completion. */ int bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) { struct partition *p = lp->d_partitions + dkpart(bp->b_dev); int labelsect = lp->d_partitions[0].p_offset; int maxsz = p->p_size, sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; /* overwriting disk label ? */ /* XXX should also protect bootstrap in first 8K */ if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && #if LABELSECTOR != 0 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && #endif (bp->b_flags & B_READ) == 0 && wlabel == 0) { bp->b_error = EROFS; goto bad; } #if defined(DOSBBSECTOR) && defined(notyet) /* overwriting master boot record? */ if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && (bp->b_flags & B_READ) == 0 && wlabel == 0) { bp->b_error = EROFS; goto bad; } #endif /* beyond partition? */ if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { /* if exactly at end of disk, return an EOF */ if (bp->b_blkno == maxsz) { bp->b_resid = bp->b_bcount; return(0); } /* or truncate if part of it fits */ sz = maxsz - bp->b_blkno; if (sz <= 0) { bp->b_error = EINVAL; goto bad; } bp->b_bcount = sz << DEV_BSHIFT; } /* calculate cylinder for disksort to order transfers with */ bp->b_pblkno = bp->b_blkno + p->p_offset; bp->b_cylin = bp->b_pblkno / lp->d_secpercyl; return(1); bad: bp->b_flags |= B_ERROR; return(-1); } diff --git a/sys/amd64/include/md_var.h b/sys/amd64/include/md_var.h index b8faa151de64..c8752e339e6e 100644 --- a/sys/amd64/include/md_var.h +++ b/sys/amd64/include/md_var.h @@ -1,74 +1,75 @@ /*- * Copyright (c) 1995 Bruce D. Evans. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the author nor the names of contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $Id: md_var.h,v 1.8 1996/03/02 19:37:45 peter Exp $ + * $Id: md_var.h,v 1.9 1996/07/01 18:12:24 bde Exp $ */ #ifndef _MACHINE_MD_VAR_H_ #define _MACHINE_MD_VAR_H_ /* * Miscellaneous machine-dependent declarations. */ extern int Maxmem; extern u_int atdevbase; /* offset in virtual memory of ISA io mem */ extern u_long cpu_feature; extern u_long cpu_high; extern u_long cpu_id; extern char cpu_vendor[]; extern char etext[]; extern char kstack[]; extern void (*netisrs[32]) __P((void)); extern int nfs_diskless_valid; extern char sigcode[]; extern int szsigcode; typedef void alias_for_inthand_t __P((u_int cs, u_int ef, u_int esp, u_int ss)); struct proc; struct reg; void bcopyb __P((const void *from, void *to, size_t len)); void cpu_reset __P((void)); +void cpu_halt __P((void)); void doreti_iret __P((void)) __asm(__STRING(doreti_iret)); void doreti_iret_fault __P((void)) __asm(__STRING(doreti_iret_fault)); void doreti_popl_ds __P((void)) __asm(__STRING(doreti_popl_ds)); void doreti_popl_ds_fault __P((void)) __asm(__STRING(doreti_popl_ds_fault)); void doreti_popl_es __P((void)) __asm(__STRING(doreti_popl_es)); void doreti_popl_es_fault __P((void)) __asm(__STRING(doreti_popl_es_fault)); int fill_regs __P((struct proc *p, struct reg *regs)); void fillw __P((int /*u_short*/ pat, void *base, size_t cnt)); int fusword __P((void *base)); u_long kvtop __P((void *addr)); void setidt __P((int idx, alias_for_inthand_t *func, int typ, int dpl, int selec)); void userconfig __P((void)); void vm_bounce_init __P((void)); int vm_page_zero_idle __P((void)); #endif /* !_MACHINE_MD_VAR_H_ */ diff --git a/sys/i386/i386/machdep.c b/sys/i386/i386/machdep.c index de5d4b7c4f10..2cf8d5f5ac6b 100644 --- a/sys/i386/i386/machdep.c +++ b/sys/i386/i386/machdep.c @@ -1,1530 +1,1540 @@ /*- * Copyright (c) 1992 Terrence R. Lambert. * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 - * $Id: machdep.c,v 1.207 1996/10/05 10:44:03 jkh Exp $ + * $Id: machdep.c,v 1.208 1996/10/20 18:35:32 phk Exp $ */ #include "npx.h" #include "opt_sysvipc.h" #include "opt_ddb.h" #include "opt_bounce.h" #include "opt_machdep.h" #include "opt_perfmon.h" #include "opt_userconfig.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef SYSVSHM #include #endif #ifdef SYSVMSG #include #endif #ifdef SYSVSEM #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef PERFMON #include #endif #include #include #include extern void init386 __P((int first)); extern int ptrace_set_pc __P((struct proc *p, unsigned int addr)); extern int ptrace_single_step __P((struct proc *p)); extern int ptrace_write_u __P((struct proc *p, vm_offset_t off, int data)); extern void dblfault_handler __P((void)); extern void identifycpu(void); /* XXX header file */ extern void earlysetcpuclass(void); /* same header file */ static void cpu_startup __P((void *)); SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) #ifdef BOUNCE_BUFFERS extern char *bouncememory; extern int maxbkva; #ifdef BOUNCEPAGES int bouncepages = BOUNCEPAGES; #else int bouncepages = 0; #endif #endif /* BOUNCE_BUFFERS */ extern int freebufspace; int msgbufmapped = 0; /* set when safe to use msgbuf */ int _udatasel, _ucodesel; u_int atdevbase; int physmem = 0; int cold = 1; static int sysctl_hw_physmem SYSCTL_HANDLER_ARGS { int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); return (error); } SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_hw_physmem, "I", ""); static int sysctl_hw_usermem SYSCTL_HANDLER_ARGS { int error = sysctl_handle_int(oidp, 0, ctob(physmem - cnt.v_wire_count), req); return (error); } SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_hw_usermem, "I", ""); int boothowto = 0, bootverbose = 0, Maxmem = 0; static int badpages = 0; long dumplo; extern int bootdev; vm_offset_t phys_avail[10]; /* must be 2 less so 0 0 can signal end of chunks */ #define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) static void setup_netisrs __P((struct linker_set *)); /* XXX declare elsewhere */ static vm_offset_t buffer_sva, buffer_eva; vm_offset_t clean_sva, clean_eva; static vm_offset_t pager_sva, pager_eva; extern struct linker_set netisr_set; #define offsetof(type, member) ((size_t)(&((type *)0)->member)) static void cpu_startup(dummy) void *dummy; { register unsigned i; register caddr_t v; vm_offset_t maxaddr; vm_size_t size = 0; int firstaddr; vm_offset_t minaddr; if (boothowto & RB_VERBOSE) bootverbose++; /* * Initialize error message buffer (at end of core). */ /* avail_end was pre-decremented in init386() to compensate */ for (i = 0; i < btoc(sizeof (struct msgbuf)); i++) pmap_enter(pmap_kernel(), (vm_offset_t)msgbufp, avail_end + i * PAGE_SIZE, VM_PROT_ALL, TRUE); msgbufmapped = 1; /* * Good {morning,afternoon,evening,night}. */ printf(version); earlysetcpuclass(); startrtclock(); identifycpu(); #ifdef PERFMON perfmon_init(); #endif printf("real memory = %d (%dK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); /* * Display any holes after the first chunk of extended memory. */ if (badpages != 0) { int indx = 1; /* * XXX skip reporting ISA hole & unmanaged kernel memory */ if (phys_avail[0] == PAGE_SIZE) indx += 2; printf("Physical memory hole(s):\n"); for (; phys_avail[indx + 1] != 0; indx += 2) { int size = phys_avail[indx + 1] - phys_avail[indx]; printf("0x%08lx - 0x%08lx, %d bytes (%d pages)\n", phys_avail[indx], phys_avail[indx + 1] - 1, size, size / PAGE_SIZE); } } /* * Quickly wire in netisrs. */ setup_netisrs(&netisr_set); /* * Allocate space for system data structures. * The first available kernel virtual address is in "v". * As pages of kernel virtual memory are allocated, "v" is incremented. * As pages of memory are allocated and cleared, * "firstaddr" is incremented. * An index into the kernel page table corresponding to the * virtual memory address maintained in "v" is kept in "mapaddr". */ /* * Make two passes. The first pass calculates how much memory is * needed and allocates it. The second pass assigns virtual * addresses to the various data structures. */ firstaddr = 0; again: v = (caddr_t)firstaddr; #define valloc(name, type, num) \ (name) = (type *)v; v = (caddr_t)((name)+(num)) #define valloclim(name, type, num, lim) \ (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) valloc(callout, struct callout, ncallout); #ifdef SYSVSHM valloc(shmsegs, struct shmid_ds, shminfo.shmmni); #endif #ifdef SYSVSEM valloc(sema, struct semid_ds, seminfo.semmni); valloc(sem, struct sem, seminfo.semmns); /* This is pretty disgusting! */ valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); #endif #ifdef SYSVMSG valloc(msgpool, char, msginfo.msgmax); valloc(msgmaps, struct msgmap, msginfo.msgseg); valloc(msghdrs, struct msg, msginfo.msgtql); valloc(msqids, struct msqid_ds, msginfo.msgmni); #endif if (nbuf == 0) { nbuf = 30; if( physmem > 1024) nbuf += min((physmem - 1024) / 12, 1024); } nswbuf = min(nbuf, 128); valloc(swbuf, struct buf, nswbuf); valloc(buf, struct buf, nbuf); #ifdef BOUNCE_BUFFERS /* * If there is more than 16MB of memory, allocate some bounce buffers */ if (Maxmem > 4096) { if (bouncepages == 0) { bouncepages = 64; bouncepages += ((Maxmem - 4096) / 2048) * 32; } v = (caddr_t)((vm_offset_t)round_page(v)); valloc(bouncememory, char, bouncepages * PAGE_SIZE); } #endif /* * End of first pass, size has been calculated so allocate memory */ if (firstaddr == 0) { size = (vm_size_t)(v - firstaddr); firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); if (firstaddr == 0) panic("startup: no room for tables"); goto again; } /* * End of second pass, addresses have been assigned */ if ((vm_size_t)(v - firstaddr) != size) panic("startup: table size inconsistency"); #ifdef BOUNCE_BUFFERS clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + maxbkva + pager_map_size, TRUE); io_map = kmem_suballoc(clean_map, &minaddr, &maxaddr, maxbkva, FALSE); #else clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + pager_map_size, TRUE); #endif buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, (nbuf*MAXBSIZE), TRUE); pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, (nswbuf*MAXPHYS) + pager_map_size, TRUE); exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, (16*ARG_MAX), TRUE); exech_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, (32*ARG_MAX), TRUE); u_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, (maxproc*UPAGES*PAGE_SIZE), FALSE); /* * Finally, allocate mbuf pool. Since mclrefcnt is an off-size * we use the more space efficient malloc in place of kmem_alloc. */ mclrefcnt = (char *)malloc(nmbclusters+PAGE_SIZE/MCLBYTES, M_MBUF, M_NOWAIT); bzero(mclrefcnt, nmbclusters+PAGE_SIZE/MCLBYTES); mcl_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, nmbclusters * MCLBYTES, FALSE); { vm_size_t mb_map_size; mb_map_size = nmbufs * MSIZE; mb_map = kmem_suballoc(kmem_map, &minaddr, &maxaddr, round_page(mb_map_size), FALSE); } /* * Initialize callouts */ callfree = callout; for (i = 1; i < ncallout; i++) callout[i-1].c_next = &callout[i]; #if defined(USERCONFIG_BOOT) && defined(USERCONFIG) boothowto |= RB_CONFIG; #endif if (boothowto & RB_CONFIG) { #ifdef USERCONFIG userconfig(); cninit(); /* the preferred console may have changed */ #else printf("Sorry! no userconfig in this kernel\n"); #endif } #ifdef BOUNCE_BUFFERS /* * init bounce buffers */ vm_bounce_init(); #endif printf("avail memory = %d (%dK bytes)\n", ptoa(cnt.v_free_count), ptoa(cnt.v_free_count) / 1024); /* * Set up buffers, so they can be used to read disk labels. */ bufinit(); vm_pager_bufferinit(); /* * In verbose mode, print out the BIOS's idea of the disk geometries. */ if (bootverbose) { printf("BIOS Geometries:\n"); for (i = 0; i < N_BIOS_GEOM; i++) { unsigned long bios_geom; int max_cylinder, max_head, max_sector; bios_geom = bootinfo.bi_bios_geom[i]; /* * XXX the bootstrap punts a 1200K floppy geometry * when the get-disk-geometry interrupt fails. Skip * drives that have this geometry. */ if (bios_geom == 0x4f010f) continue; printf(" %x:%08lx ", i, bios_geom); max_cylinder = bios_geom >> 16; max_head = (bios_geom >> 8) & 0xff; max_sector = bios_geom & 0xff; printf( "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n", max_cylinder, max_cylinder + 1, max_head, max_head + 1, max_sector, max_sector); } printf(" %d accounted for\n", bootinfo.bi_n_bios_used); } } int register_netisr(num, handler) int num; netisr_t *handler; { if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { printf("register_netisr: bad isr number: %d\n", num); return (EINVAL); } netisrs[num] = handler; return (0); } static void setup_netisrs(ls) struct linker_set *ls; { int i; const struct netisrtab *nit; for(i = 0; ls->ls_items[i]; i++) { nit = (const struct netisrtab *)ls->ls_items[i]; register_netisr(nit->nit_num, nit->nit_isr); } } /* * Send an interrupt to process. * * Stack is set up to allow sigcode stored * at top to call routine, followed by kcall * to sigreturn routine below. After sigreturn * resets the signal mask, the stack, and the * frame pointer, it returns to the user * specified pc, psl. */ void sendsig(catcher, sig, mask, code) sig_t catcher; int sig, mask; u_long code; { register struct proc *p = curproc; register int *regs; register struct sigframe *fp; struct sigframe sf; struct sigacts *psp = p->p_sigacts; int oonstack; regs = p->p_md.md_regs; oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; /* * Allocate and validate space for the signal handler context. */ if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && (psp->ps_sigonstack & sigmask(sig))) { fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + psp->ps_sigstk.ss_size - sizeof(struct sigframe)); psp->ps_sigstk.ss_flags |= SS_ONSTACK; } else { fp = (struct sigframe *)regs[tESP] - 1; } /* * grow() will return FALSE if the fp will not fit inside the stack * and the stack can not be grown. useracc will return FALSE * if access is denied. */ if ((grow(p, (int)fp) == FALSE) || (useracc((caddr_t)fp, sizeof (struct sigframe), B_WRITE) == FALSE)) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ SIGACTION(p, SIGILL) = SIG_DFL; sig = sigmask(SIGILL); p->p_sigignore &= ~sig; p->p_sigcatch &= ~sig; p->p_sigmask &= ~sig; psignal(p, SIGILL); return; } /* * Build the argument list for the signal handler. */ if (p->p_sysent->sv_sigtbl) { if (sig < p->p_sysent->sv_sigsize) sig = p->p_sysent->sv_sigtbl[sig]; else sig = p->p_sysent->sv_sigsize + 1; } sf.sf_signum = sig; sf.sf_code = code; sf.sf_scp = &fp->sf_sc; sf.sf_addr = (char *) regs[tERR]; sf.sf_handler = catcher; /* save scratch registers */ sf.sf_sc.sc_eax = regs[tEAX]; sf.sf_sc.sc_ebx = regs[tEBX]; sf.sf_sc.sc_ecx = regs[tECX]; sf.sf_sc.sc_edx = regs[tEDX]; sf.sf_sc.sc_esi = regs[tESI]; sf.sf_sc.sc_edi = regs[tEDI]; sf.sf_sc.sc_cs = regs[tCS]; sf.sf_sc.sc_ds = regs[tDS]; sf.sf_sc.sc_ss = regs[tSS]; sf.sf_sc.sc_es = regs[tES]; sf.sf_sc.sc_isp = regs[tISP]; /* * Build the signal context to be used by sigreturn. */ sf.sf_sc.sc_onstack = oonstack; sf.sf_sc.sc_mask = mask; sf.sf_sc.sc_sp = regs[tESP]; sf.sf_sc.sc_fp = regs[tEBP]; sf.sf_sc.sc_pc = regs[tEIP]; sf.sf_sc.sc_ps = regs[tEFLAGS]; /* * Copy the sigframe out to the user's stack. */ if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { /* * Something is wrong with the stack pointer. * ...Kill the process. */ sigexit(p, SIGILL); }; regs[tESP] = (int)fp; regs[tEIP] = (int)(((char *)PS_STRINGS) - *(p->p_sysent->sv_szsigcode)); regs[tEFLAGS] &= ~PSL_VM; regs[tCS] = _ucodesel; regs[tDS] = _udatasel; regs[tES] = _udatasel; regs[tSS] = _udatasel; } /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by sendsig (above). * Return to previous pc and psl as specified by * context left by sendsig. Check carefully to * make sure that the user has not modified the * state to gain improper privileges. */ int sigreturn(p, uap, retval) struct proc *p; struct sigreturn_args /* { struct sigcontext *sigcntxp; } */ *uap; int *retval; { register struct sigcontext *scp; register struct sigframe *fp; register int *regs = p->p_md.md_regs; int eflags; /* * (XXX old comment) regs[tESP] points to the return address. * The user scp pointer is above that. * The return address is faked in the signal trampoline code * for consistency. */ scp = uap->sigcntxp; fp = (struct sigframe *) ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); if (useracc((caddr_t)fp, sizeof (*fp), 0) == 0) return(EINVAL); /* * Don't allow users to change privileged or reserved flags. */ #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) eflags = scp->sc_ps; /* * XXX do allow users to change the privileged flag PSL_RF. The * cpu sets PSL_RF in tf_eflags for faults. Debuggers should * sometimes set it there too. tf_eflags is kept in the signal * context during signal handling and there is no other place * to remember it, so the PSL_RF bit may be corrupted by the * signal handler without us knowing. Corruption of the PSL_RF * bit at worst causes one more or one less debugger trap, so * allowing it is fairly harmless. */ if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs[tEFLAGS] & ~PSL_RF)) { #ifdef DEBUG printf("sigreturn: eflags = 0x%x\n", eflags); #endif return(EINVAL); } /* * Don't allow users to load a valid privileged %cs. Let the * hardware check for invalid selectors, excess privilege in * other selectors, invalid %eip's and invalid %esp's. */ #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) if (!CS_SECURE(scp->sc_cs)) { #ifdef DEBUG printf("sigreturn: cs = 0x%x\n", scp->sc_cs); #endif trapsignal(p, SIGBUS, T_PROTFLT); return(EINVAL); } /* restore scratch registers */ regs[tEAX] = scp->sc_eax; regs[tEBX] = scp->sc_ebx; regs[tECX] = scp->sc_ecx; regs[tEDX] = scp->sc_edx; regs[tESI] = scp->sc_esi; regs[tEDI] = scp->sc_edi; regs[tCS] = scp->sc_cs; regs[tDS] = scp->sc_ds; regs[tES] = scp->sc_es; regs[tSS] = scp->sc_ss; regs[tISP] = scp->sc_isp; if (useracc((caddr_t)scp, sizeof (*scp), 0) == 0) return(EINVAL); if (scp->sc_onstack & 01) p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; else p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; p->p_sigmask = scp->sc_mask &~ (sigmask(SIGKILL)|sigmask(SIGCONT)|sigmask(SIGSTOP)); regs[tEBP] = scp->sc_fp; regs[tESP] = scp->sc_sp; regs[tEIP] = scp->sc_pc; regs[tEFLAGS] = eflags; return(EJUSTRETURN); } /* * Machine depdnetnt boot() routine * * I haven't seen anything too put here yet * Possibly some stuff might be grafted back here from boot() */ void cpu_boot(int howto) { } +/* + * Shutdown the CPU as much as possible + */ +void +cpu_halt(void) +{ + for (;;) + __asm__ ("hlt"); +} + /* * Clear registers on exec */ void setregs(p, entry, stack) struct proc *p; u_long entry; u_long stack; { int *regs = p->p_md.md_regs; #ifdef USER_LDT struct pcb *pcb = &p->p_addr->u_pcb; /* was i386_user_cleanup() in NetBSD */ if (pcb->pcb_ldt) { if (pcb == curpcb) lldt(GSEL(GUSERLDT_SEL, SEL_KPL)); kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, pcb->pcb_ldt_len * sizeof(union descriptor)); pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; } #endif bzero(regs, sizeof(struct trapframe)); regs[tEIP] = entry; regs[tESP] = stack; regs[tEFLAGS] = PSL_USER | (regs[tEFLAGS] & PSL_T); regs[tSS] = _udatasel; regs[tDS] = _udatasel; regs[tES] = _udatasel; regs[tCS] = _ucodesel; p->p_addr->u_pcb.pcb_flags = 0; /* no fp at all */ load_cr0(rcr0() | CR0_TS); /* start emulating */ #if NNPX > 0 npxinit(__INITIAL_NPXCW__); #endif /* NNPX > 0 */ } static int sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS { int error; error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); if (!error && req->newptr) resettodr(); return (error); } SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, CTLFLAG_RW, &disable_rtc_set, 0, ""); SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, CTLFLAG_RD, &bootinfo, bootinfo, ""); SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, CTLFLAG_RW, &wall_cmos_clock, 0, ""); /* * Initialize 386 and configure to run kernel */ /* * Initialize segments & interrupt table */ int currentldt; int _default_ldt; union descriptor gdt[NGDT]; /* global descriptor table */ struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ union descriptor ldt[NLDT]; /* local descriptor table */ static struct i386tss dblfault_tss; static char dblfault_stack[PAGE_SIZE]; extern struct user *proc0paddr; /* software prototypes -- in more palatable form */ struct soft_segment_descriptor gdt_segs[] = { /* GNULL_SEL 0 Null Descriptor */ { 0x0, /* segment base address */ 0x0, /* length */ 0, /* segment type */ 0, /* segment descriptor priority level */ 0, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GCODE_SEL 1 Code Descriptor for kernel */ { 0x0, /* segment base address */ 0xfffff, /* length - all address space */ SDT_MEMERA, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, /* GDATA_SEL 2 Data Descriptor for kernel */ { 0x0, /* segment base address */ 0xfffff, /* length - all address space */ SDT_MEMRWA, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, /* GLDT_SEL 3 LDT Descriptor */ { (int) ldt, /* segment base address */ sizeof(ldt)-1, /* length - all address space */ SDT_SYSLDT, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 0, /* unused - default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GTGATE_SEL 4 Null Descriptor - Placeholder */ { 0x0, /* segment base address */ 0x0, /* length - all address space */ 0, /* segment type */ 0, /* segment descriptor priority level */ 0, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GPANIC_SEL 5 Panic Tss Descriptor */ { (int) &dblfault_tss, /* segment base address */ sizeof(struct i386tss)-1,/* length - all address space */ SDT_SYS386TSS, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 0, /* unused - default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GPROC0_SEL 6 Proc 0 Tss Descriptor */ { (int) kstack, /* segment base address */ sizeof(struct i386tss)-1,/* length - all address space */ SDT_SYS386TSS, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 0, /* unused - default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GUSERLDT_SEL 7 User LDT Descriptor per process */ { (int) ldt, /* segment base address */ (512 * sizeof(union descriptor)-1), /* length */ SDT_SYSLDT, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 0, /* unused - default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ { 0, /* segment base address (overwritten by APM) */ 0xfffff, /* length */ SDT_MEMERA, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, /* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ { 0, /* segment base address (overwritten by APM) */ 0xfffff, /* length */ SDT_MEMERA, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, /* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ { 0, /* segment base address (overwritten by APM) */ 0xfffff, /* length */ SDT_MEMRWA, /* segment type */ 0, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, }; static struct soft_segment_descriptor ldt_segs[] = { /* Null Descriptor - overwritten by call gate */ { 0x0, /* segment base address */ 0x0, /* length - all address space */ 0, /* segment type */ 0, /* segment descriptor priority level */ 0, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* Null Descriptor - overwritten by call gate */ { 0x0, /* segment base address */ 0x0, /* length - all address space */ 0, /* segment type */ 0, /* segment descriptor priority level */ 0, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* Null Descriptor - overwritten by call gate */ { 0x0, /* segment base address */ 0x0, /* length - all address space */ 0, /* segment type */ 0, /* segment descriptor priority level */ 0, /* segment descriptor present */ 0, 0, 0, /* default 32 vs 16 bit size */ 0 /* limit granularity (byte/page units)*/ }, /* Code Descriptor for user */ { 0x0, /* segment base address */ 0xfffff, /* length - all address space */ SDT_MEMERA, /* segment type */ SEL_UPL, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, /* Data Descriptor for user */ { 0x0, /* segment base address */ 0xfffff, /* length - all address space */ SDT_MEMRWA, /* segment type */ SEL_UPL, /* segment descriptor priority level */ 1, /* segment descriptor present */ 0, 0, 1, /* default 32 vs 16 bit size */ 1 /* limit granularity (byte/page units)*/ }, }; void setidt(idx, func, typ, dpl, selec) int idx; inthand_t *func; int typ; int dpl; int selec; { struct gate_descriptor *ip = idt + idx; ip->gd_looffset = (int)func; ip->gd_selector = selec; ip->gd_stkcpy = 0; ip->gd_xx = 0; ip->gd_type = typ; ip->gd_dpl = dpl; ip->gd_p = 1; ip->gd_hioffset = ((int)func)>>16 ; } #define IDTVEC(name) __CONCAT(X,name) extern inthand_t IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), IDTVEC(syscall), IDTVEC(int0x80_syscall); void sdtossd(sd, ssd) struct segment_descriptor *sd; struct soft_segment_descriptor *ssd; { ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; ssd->ssd_type = sd->sd_type; ssd->ssd_dpl = sd->sd_dpl; ssd->ssd_p = sd->sd_p; ssd->ssd_def32 = sd->sd_def32; ssd->ssd_gran = sd->sd_gran; } void init386(first) int first; { int x; unsigned biosbasemem, biosextmem; struct gate_descriptor *gdp; int gsel_tss; /* table descriptors - used to load tables by microp */ struct region_descriptor r_gdt, r_idt; int pagesinbase, pagesinext; int target_page, pa_indx; proc0.p_addr = proc0paddr; atdevbase = ISA_HOLE_START + KERNBASE; /* * Initialize the console before we print anything out. */ cninit(); /* * make gdt memory segments, the code segment goes up to end of the * page with etext in it, the data segment goes to the end of * the address space */ /* * XXX text protection is temporarily (?) disabled. The limit was * i386_btop(round_page(etext)) - 1. */ gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; for (x = 0; x < NGDT; x++) ssdtosd(&gdt_segs[x], &gdt[x].sd); /* make ldt memory segments */ /* * The data segment limit must not cover the user area because we * don't want the user area to be writable in copyout() etc. (page * level protection is lost in kernel mode on 386's). Also, we * don't want the user area to be writable directly (page level * protection of the user area is not available on 486's with * CR0_WP set, because there is no user-read/kernel-write mode). * * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it * should be spelled ...MAX_USER... */ #define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS /* * The code segment limit has to cover the user area until we move * the signal trampoline out of the user area. This is safe because * the code segment cannot be written to directly. */ #define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; /* Note. eventually want private ldts per process */ for (x = 0; x < NLDT; x++) ssdtosd(&ldt_segs[x], &ldt[x].sd); /* exceptions */ for (x = 0; x < NIDT; x++) setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(14, &IDTVEC(page), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); setidt(0x80, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); #include "isa.h" #if NISA >0 isa_defaultirq(); #endif rand_initialize(); r_gdt.rd_limit = sizeof(gdt) - 1; r_gdt.rd_base = (int) gdt; lgdt(&r_gdt); r_idt.rd_limit = sizeof(idt) - 1; r_idt.rd_base = (int) idt; lidt(&r_idt); _default_ldt = GSEL(GLDT_SEL, SEL_KPL); lldt(_default_ldt); currentldt = _default_ldt; #ifdef DDB kdb_init(); if (boothowto & RB_KDB) Debugger("Boot flags requested debugger"); #endif /* Use BIOS values stored in RTC CMOS RAM, since probing * breaks certain 386 AT relics. */ biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); /* * If BIOS tells us that it has more than 640k in the basemem, * don't believe it - set it to 640k. */ if (biosbasemem > 640) { printf("Preposterous RTC basemem of %dK, truncating to 640K\n", biosbasemem); biosbasemem = 640; } if (bootinfo.bi_memsizes_valid && bootinfo.bi_basemem > 640) { printf("Preposterous BIOS basemem of %dK, truncating to 640K\n", bootinfo.bi_basemem); bootinfo.bi_basemem = 640; } /* * Warn if the official BIOS interface disagrees with the RTC * interface used above about the amount of base memory or the * amount of extended memory. Prefer the BIOS value for the base * memory. This is necessary for machines that `steal' base * memory for use as BIOS memory, at least if we are going to use * the BIOS for apm. Prefer the RTC value for extended memory. * Eventually the hackish interface shouldn't even be looked at. */ if (bootinfo.bi_memsizes_valid) { if (bootinfo.bi_basemem != biosbasemem) { vm_offset_t pa; printf( "BIOS basemem (%ldK) != RTC basemem (%dK), setting to BIOS value\n", bootinfo.bi_basemem, biosbasemem); biosbasemem = bootinfo.bi_basemem; /* * XXX if biosbasemem is now < 640, there is `hole' * between the end of base memory and the start of * ISA memory. The hole may be empty or it may * contain BIOS code or data. Map it read/write so * that the BIOS can write to it. (Memory from 0 to * the physical end of the kernel is mapped read-only * to begin with and then parts of it are remapped. * The parts that aren't remapped form holes that * remain read-only and are unused by the kernel. * The base memory area is below the physical end of * the kernel and right now forms a read-only hole. * The part of it from 0 to * (trunc_page(biosbasemem * 1024) - 1) will be * remapped and used by the kernel later.) * * This code is similar to the code used in * pmap_mapdev, but since no memory needs to be * allocated we simply change the mapping. */ for (pa = trunc_page(biosbasemem * 1024); pa < ISA_HOLE_START; pa += PAGE_SIZE) { unsigned *pte; pte = (unsigned *)vtopte(pa + KERNBASE); *pte = pa | PG_RW | PG_V; } } if (bootinfo.bi_extmem != biosextmem) printf("BIOS extmem (%ldK) != RTC extmem (%dK)\n", bootinfo.bi_extmem, biosextmem); } pagesinbase = biosbasemem * 1024 / PAGE_SIZE; pagesinext = biosextmem * 1024 / PAGE_SIZE; /* * Special hack for chipsets that still remap the 384k hole when * there's 16MB of memory - this really confuses people that * are trying to use bus mastering ISA controllers with the * "16MB limit"; they only have 16MB, but the remapping puts * them beyond the limit. */ /* * If extended memory is between 15-16MB (16-17MB phys address range), * chop it to 15MB. */ if ((pagesinext > 3840) && (pagesinext < 4096)) pagesinext = 3840; /* * Maxmem isn't the "maximum memory", it's one larger than the * highest page of the physical address space. It should be * called something like "Maxphyspage". */ Maxmem = pagesinext + 0x100000/PAGE_SIZE; #ifdef MAXMEM Maxmem = MAXMEM/4; #endif /* call pmap initialization to make new kernel address space */ pmap_bootstrap (first, 0); /* * Size up each available chunk of physical memory. */ /* * We currently don't bother testing base memory. * XXX ...but we probably should. */ pa_indx = 0; badpages = 0; if (pagesinbase > 1) { phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ physmem = pagesinbase - 1; } else { /* point at first chunk end */ pa_indx++; } for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { int tmp, page_bad = FALSE; /* * map page into kernel: valid, read/write, non-cacheable */ *(int *)CMAP1 = PG_V | PG_RW | PG_N | target_page; invltlb(); tmp = *(int *)CADDR1; /* * Test for alternating 1's and 0's */ *(volatile int *)CADDR1 = 0xaaaaaaaa; if (*(volatile int *)CADDR1 != 0xaaaaaaaa) { page_bad = TRUE; } /* * Test for alternating 0's and 1's */ *(volatile int *)CADDR1 = 0x55555555; if (*(volatile int *)CADDR1 != 0x55555555) { page_bad = TRUE; } /* * Test for all 1's */ *(volatile int *)CADDR1 = 0xffffffff; if (*(volatile int *)CADDR1 != 0xffffffff) { page_bad = TRUE; } /* * Test for all 0's */ *(volatile int *)CADDR1 = 0x0; if (*(volatile int *)CADDR1 != 0x0) { /* * test of page failed */ page_bad = TRUE; } /* * Restore original value. */ *(int *)CADDR1 = tmp; /* * Adjust array of valid/good pages. */ if (page_bad == FALSE) { /* * If this good page is a continuation of the * previous set of good pages, then just increase * the end pointer. Otherwise start a new chunk. * Note that "end" points one higher than end, * making the range >= start and < end. */ if (phys_avail[pa_indx] == target_page) { phys_avail[pa_indx] += PAGE_SIZE; } else { pa_indx++; if (pa_indx == PHYS_AVAIL_ARRAY_END) { printf("Too many holes in the physical address space, giving up\n"); pa_indx--; break; } phys_avail[pa_indx++] = target_page; /* start */ phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ } physmem++; } else { badpages++; page_bad = FALSE; } } *(int *)CMAP1 = 0; invltlb(); /* * XXX * The last chunk must contain at least one page plus the message * buffer to avoid complicating other code (message buffer address * calculation, etc.). */ while (phys_avail[pa_indx - 1] + PAGE_SIZE + round_page(sizeof(struct msgbuf)) >= phys_avail[pa_indx]) { physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); phys_avail[pa_indx--] = 0; phys_avail[pa_indx--] = 0; } Maxmem = atop(phys_avail[pa_indx]); /* Trim off space for the message buffer. */ phys_avail[pa_indx] -= round_page(sizeof(struct msgbuf)); avail_end = phys_avail[pa_indx]; /* now running on new page tables, configured,and u/iom is accessible */ /* make a initial tss so microp can get interrupt stack on syscall! */ proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*PAGE_SIZE; proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); dblfault_tss.tss_cr3 = IdlePTD; dblfault_tss.tss_eip = (int) dblfault_handler; dblfault_tss.tss_eflags = PSL_KERNEL; dblfault_tss.tss_ds = dblfault_tss.tss_es = dblfault_tss.tss_fs = dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); ((struct i386tss *)gdt_segs[GPROC0_SEL].ssd_base)->tss_ioopt = (sizeof(struct i386tss))<<16; ltr(gsel_tss); /* make a call gate to reenter kernel with */ gdp = &ldt[LSYS5CALLS_SEL].gd; x = (int) &IDTVEC(syscall); gdp->gd_looffset = x++; gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); gdp->gd_stkcpy = 1; gdp->gd_type = SDT_SYS386CGT; gdp->gd_dpl = SEL_UPL; gdp->gd_p = 1; gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; /* XXX does this work? */ ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; /* transfer to user mode */ _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); _udatasel = LSEL(LUDATA_SEL, SEL_UPL); /* setup proc 0's pcb */ proc0.p_addr->u_pcb.pcb_flags = 0; proc0.p_addr->u_pcb.pcb_cr3 = IdlePTD; } /* * The registers are in the frame; the frame is in the user area of * the process in question; when the process is active, the registers * are in "the kernel stack"; when it's not, they're still there, but * things get flipped around. So, since p->p_md.md_regs is the whole address * of the register set, take its offset from the kernel stack, and * index into the user block. Don't you just *love* virtual memory? * (I'm starting to think seymour is right...) */ #define TF_REGP(p) ((struct trapframe *) \ ((char *)(p)->p_addr \ + ((char *)(p)->p_md.md_regs - kstack))) int ptrace_set_pc(p, addr) struct proc *p; unsigned int addr; { TF_REGP(p)->tf_eip = addr; return (0); } int ptrace_single_step(p) struct proc *p; { TF_REGP(p)->tf_eflags |= PSL_T; return (0); } int ptrace_write_u(p, off, data) struct proc *p; vm_offset_t off; int data; { struct trapframe frame_copy; vm_offset_t min; struct trapframe *tp; /* * Privileged kernel state is scattered all over the user area. * Only allow write access to parts of regs and to fpregs. */ min = (char *)p->p_md.md_regs - kstack; if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { tp = TF_REGP(p); frame_copy = *tp; *(int *)((char *)&frame_copy + (off - min)) = data; if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || !CS_SECURE(frame_copy.tf_cs)) return (EINVAL); *(int*)((char *)p->p_addr + off) = data; return (0); } min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { *(int*)((char *)p->p_addr + off) = data; return (0); } return (EFAULT); } int fill_regs(p, regs) struct proc *p; struct reg *regs; { struct trapframe *tp; tp = TF_REGP(p); regs->r_es = tp->tf_es; regs->r_ds = tp->tf_ds; regs->r_edi = tp->tf_edi; regs->r_esi = tp->tf_esi; regs->r_ebp = tp->tf_ebp; regs->r_ebx = tp->tf_ebx; regs->r_edx = tp->tf_edx; regs->r_ecx = tp->tf_ecx; regs->r_eax = tp->tf_eax; regs->r_eip = tp->tf_eip; regs->r_cs = tp->tf_cs; regs->r_eflags = tp->tf_eflags; regs->r_esp = tp->tf_esp; regs->r_ss = tp->tf_ss; return (0); } int set_regs(p, regs) struct proc *p; struct reg *regs; { struct trapframe *tp; tp = TF_REGP(p); if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || !CS_SECURE(regs->r_cs)) return (EINVAL); tp->tf_es = regs->r_es; tp->tf_ds = regs->r_ds; tp->tf_edi = regs->r_edi; tp->tf_esi = regs->r_esi; tp->tf_ebp = regs->r_ebp; tp->tf_ebx = regs->r_ebx; tp->tf_edx = regs->r_edx; tp->tf_ecx = regs->r_ecx; tp->tf_eax = regs->r_eax; tp->tf_eip = regs->r_eip; tp->tf_cs = regs->r_cs; tp->tf_eflags = regs->r_eflags; tp->tf_esp = regs->r_esp; tp->tf_ss = regs->r_ss; return (0); } #ifndef DDB void Debugger(const char *msg) { printf("Debugger(\"%s\") called.\n", msg); } #endif /* no DDB */ #include #define b_cylin b_resid /* * Determine the size of the transfer, and make sure it is * within the boundaries of the partition. Adjust transfer * if needed, and signal errors or early completion. */ int bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) { struct partition *p = lp->d_partitions + dkpart(bp->b_dev); int labelsect = lp->d_partitions[0].p_offset; int maxsz = p->p_size, sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; /* overwriting disk label ? */ /* XXX should also protect bootstrap in first 8K */ if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && #if LABELSECTOR != 0 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && #endif (bp->b_flags & B_READ) == 0 && wlabel == 0) { bp->b_error = EROFS; goto bad; } #if defined(DOSBBSECTOR) && defined(notyet) /* overwriting master boot record? */ if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && (bp->b_flags & B_READ) == 0 && wlabel == 0) { bp->b_error = EROFS; goto bad; } #endif /* beyond partition? */ if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { /* if exactly at end of disk, return an EOF */ if (bp->b_blkno == maxsz) { bp->b_resid = bp->b_bcount; return(0); } /* or truncate if part of it fits */ sz = maxsz - bp->b_blkno; if (sz <= 0) { bp->b_error = EINVAL; goto bad; } bp->b_bcount = sz << DEV_BSHIFT; } /* calculate cylinder for disksort to order transfers with */ bp->b_pblkno = bp->b_blkno + p->p_offset; bp->b_cylin = bp->b_pblkno / lp->d_secpercyl; return(1); bad: bp->b_flags |= B_ERROR; return(-1); } diff --git a/sys/i386/include/md_var.h b/sys/i386/include/md_var.h index b8faa151de64..c8752e339e6e 100644 --- a/sys/i386/include/md_var.h +++ b/sys/i386/include/md_var.h @@ -1,74 +1,75 @@ /*- * Copyright (c) 1995 Bruce D. Evans. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the author nor the names of contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $Id: md_var.h,v 1.8 1996/03/02 19:37:45 peter Exp $ + * $Id: md_var.h,v 1.9 1996/07/01 18:12:24 bde Exp $ */ #ifndef _MACHINE_MD_VAR_H_ #define _MACHINE_MD_VAR_H_ /* * Miscellaneous machine-dependent declarations. */ extern int Maxmem; extern u_int atdevbase; /* offset in virtual memory of ISA io mem */ extern u_long cpu_feature; extern u_long cpu_high; extern u_long cpu_id; extern char cpu_vendor[]; extern char etext[]; extern char kstack[]; extern void (*netisrs[32]) __P((void)); extern int nfs_diskless_valid; extern char sigcode[]; extern int szsigcode; typedef void alias_for_inthand_t __P((u_int cs, u_int ef, u_int esp, u_int ss)); struct proc; struct reg; void bcopyb __P((const void *from, void *to, size_t len)); void cpu_reset __P((void)); +void cpu_halt __P((void)); void doreti_iret __P((void)) __asm(__STRING(doreti_iret)); void doreti_iret_fault __P((void)) __asm(__STRING(doreti_iret_fault)); void doreti_popl_ds __P((void)) __asm(__STRING(doreti_popl_ds)); void doreti_popl_ds_fault __P((void)) __asm(__STRING(doreti_popl_ds_fault)); void doreti_popl_es __P((void)) __asm(__STRING(doreti_popl_es)); void doreti_popl_es_fault __P((void)) __asm(__STRING(doreti_popl_es_fault)); int fill_regs __P((struct proc *p, struct reg *regs)); void fillw __P((int /*u_short*/ pat, void *base, size_t cnt)); int fusword __P((void *base)); u_long kvtop __P((void *addr)); void setidt __P((int idx, alias_for_inthand_t *func, int typ, int dpl, int selec)); void userconfig __P((void)); void vm_bounce_init __P((void)); int vm_page_zero_idle __P((void)); #endif /* !_MACHINE_MD_VAR_H_ */ diff --git a/sys/kern/kern_shutdown.c b/sys/kern/kern_shutdown.c index 40d1d7403cd7..11e395b8e957 100644 --- a/sys/kern/kern_shutdown.c +++ b/sys/kern/kern_shutdown.c @@ -1,438 +1,444 @@ /*- * Copyright (c) 1986, 1988, 1991, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)kern_shutdown.c 8.3 (Berkeley) 1/21/94 - * $Id: kern_shutdown.c,v 1.8 1996/09/14 04:31:01 bde Exp $ + * $Id: kern_shutdown.c,v 1.9 1996/10/30 21:40:22 julian Exp $ */ #include "opt_ddb.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef PANIC_REBOOT_WAIT_TIME #define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ #endif /* * Note that stdarg.h and the ANSI style va_start macro is used for both * ANSI and traditional C compilers. */ #include #if defined(DDB) #ifdef DDB_UNATTENDED static int debugger_on_panic = 0; #else static int debugger_on_panic = 1; #endif SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW, &debugger_on_panic, 0, ""); #endif /* * Variable panicstr contains argument to first call to panic; used as flag * to indicate that the kernel has already called panic. */ const char *panicstr; /* * callout list for things to do a shutdown */ typedef struct shutdown_list_element { struct shutdown_list_element *next; bootlist_fn function; void *arg; } *sle_p; /* * there are two shutdown lists. Some things need to be shut down * Earlier than others. */ static sle_p shutdown_list1; static sle_p shutdown_list2; static void dumpsys(void); #ifndef _SYS_SYSPROTO_H_ struct reboot_args { int opt; }; #endif /* ARGSUSED */ /* * The system call that results in a reboot */ int reboot(p, uap, retval) struct proc *p; struct reboot_args *uap; int *retval; { int error; if ((error = suser(p->p_ucred, &p->p_acflag))) return (error); boot(uap->opt); return (0); } /* * Called by events that want to shut down.. e.g on a PC */ void shutdown_nice(void) { /* Send a signal to init(8) and have it shutdown the world */ if (initproc != NULL) { psignal(initproc, SIGINT); } else { /* No init(8) running, so simply reboot */ boot(RB_NOSYNC); } return; } static int waittime = -1; static struct pcb dumppcb; /* * Go through the rigmarole of shutting down.. * this used to be in machdep.c but I'll be dammned if I could see * anything machine dependant in it. */ void boot(howto) int howto; { sle_p ep; ep = shutdown_list1; while (ep) { shutdown_list1 = ep->next; (*ep->function)(howto, ep->arg); ep = ep->next; } if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { register struct buf *bp; int iter, nbusy; waittime = 0; printf("\nsyncing disks... "); sync(&proc0, NULL, NULL); for (iter = 0; iter < 20; iter++) { nbusy = 0; for (bp = &buf[nbuf]; --bp >= buf; ) { if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { nbusy++; } } if (nbusy == 0) break; printf("%d ", nbusy); DELAY(40000 * iter); } if (nbusy) { /* * Failed to sync all blocks. Indicate this and don't * unmount filesystems (thus forcing an fsck on reboot). */ printf("giving up\n"); #ifdef SHOW_BUSYBUFS nbusy = 0; for (bp = &buf[nbuf]; --bp >= buf; ) { if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { nbusy++; printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno); } } DELAY(5000000); /* 5 seconds */ #endif } else { printf("done\n"); /* * Unmount filesystems */ if (panicstr == 0) vfs_unmountall(); } DELAY(100000); /* wait for console output to finish */ } ep = shutdown_list2; while (ep) { shutdown_list2 = ep->next; (*ep->function)(howto, ep->arg); ep = ep->next; } splhigh(); if (howto & RB_HALT) { printf("\n"); printf("The operating system has halted.\n"); printf("Please press any key to reboot.\n\n"); - while (cngetc() == -1); /* no console, halt means STOP HERE */ + switch (cngetc()) { + case -1: /* No console, just die */ + cpu_halt(); + /* NOTREACHED */ + default: + break; + } } else { if (howto & RB_DUMP) { if (!cold) { savectx(&dumppcb); dumppcb.pcb_cr3 = rcr3(); dumpsys(); } if (PANIC_REBOOT_WAIT_TIME != 0) { if (PANIC_REBOOT_WAIT_TIME != -1) { int loop; printf("Automatic reboot in %d seconds - press a key on the console to abort\n", PANIC_REBOOT_WAIT_TIME); for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { DELAY(1000 * 100); /* 1/10th second */ /* Did user type a key? */ if (cncheckc() != -1) break; } if (!loop) goto die; } } else { /* zero time specified - reboot NOW */ goto die; } printf("--> Press a key on the console to reboot <--\n"); cngetc(); } } die: printf("Rebooting...\n"); DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ /* cpu_boot(howto); */ /* doesn't do anything at the moment */ cpu_reset(); for(;;) ; /* NOTREACHED */ } /* * Magic number for savecore * * exported (symorder) and used at least by savecore(8) * */ static u_long const dumpmag = 0x8fca0101UL; static int dumpsize = 0; /* also for savecore */ static int dodump = 1; SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); /* * Doadump comes here after turning off memory management and * getting on the dump stack, either when called above, or by * the auto-restart code. */ static void dumpsys(void) { if (!dodump) return; if (dumpdev == NODEV) return; if ((minor(dumpdev)&07) != 1) return; if (!(bdevsw[major(dumpdev)])) return; if (!(bdevsw[major(dumpdev)]->d_dump)) return; dumpsize = Maxmem; printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); printf("dump "); switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { case ENXIO: printf("device bad\n"); break; case EFAULT: printf("device not ready\n"); break; case EINVAL: printf("area improper\n"); break; case EIO: printf("i/o error\n"); break; case EINTR: printf("aborted from console\n"); break; default: printf("succeeded\n"); break; } } /* * Panic is called on unresolvable fatal errors. It prints "panic: mesg", * and then reboots. If we are called twice, then we avoid trying to sync * the disks as this often leads to recursive panics. */ void panic(const char *fmt, ...) { int bootopt; va_list ap; bootopt = RB_AUTOBOOT | RB_DUMP; if (panicstr) bootopt |= RB_NOSYNC; else panicstr = fmt; printf("panic: "); va_start(ap, fmt); vprintf(fmt, ap); va_end(ap); printf("\n"); #if defined(DDB) if (debugger_on_panic) Debugger ("panic"); #endif boot(bootopt); } /* * Two routines to handle adding/deleting items on the * shutdown callout lists * * at_shutdown(): * Take the arguments given and put them onto the shutdown callout list. * However first make sure that it's not already there. * returns 0 on success. */ int at_shutdown(bootlist_fn function, void *arg, int position) { sle_p ep, *epp; switch(position) { case SHUTDOWN_PRE_SYNC: epp = &shutdown_list1; break; case SHUTDOWN_POST_SYNC: epp = &shutdown_list2; break; default: printf("bad exit callout list specified\n"); return (EINVAL); } if (rm_at_shutdown(function, arg)) printf("exit callout entry already present\n"); ep = malloc(sizeof(*ep), M_TEMP, M_NOWAIT); if (ep == NULL) return (ENOMEM); ep->next = *epp; ep->function = function; ep->arg = arg; *epp = ep; return (0); } /* * Scan the exit callout lists for the given items and remove them. * Returns the number of items removed. */ int rm_at_shutdown(bootlist_fn function, void *arg) { sle_p *epp, ep; int count; count = 0; epp = &shutdown_list1; ep = *epp; while (ep) { if ((ep->function == function) && (ep->arg == arg)) { *epp = ep->next; free(ep, M_TEMP); count++; } else { epp = &ep->next; } ep = *epp; } epp = &shutdown_list2; ep = *epp; while (ep) { if ((ep->function == function) && (ep->arg == arg)) { *epp = ep->next; free(ep, M_TEMP); count++; } else { epp = &ep->next; } ep = *epp; } return (count); }