Index: head/sys/riscv/riscv/machdep.c =================================================================== --- head/sys/riscv/riscv/machdep.c (revision 336008) +++ head/sys/riscv/riscv/machdep.c (revision 336009) @@ -1,887 +1,885 @@ /*- * Copyright (c) 2014 Andrew Turner * Copyright (c) 2015-2017 Ruslan Bukin * All rights reserved. * * Portions of this software were developed by SRI International and the * University of Cambridge Computer Laboratory under DARPA/AFRL contract * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme. * * Portions of this software were developed by the University of Cambridge * Computer Laboratory as part of the CTSRD Project, with support from the * UK Higher Education Innovation Fund (HEIF). * * 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. * * 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. */ #include "opt_platform.h" #include __FBSDID("$FreeBSD$"); #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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef FPE #include #endif #ifdef FDT #include #include #endif struct pcpu __pcpu[MAXCPU]; static struct trapframe proc0_tf; vm_paddr_t phys_avail[PHYS_AVAIL_SIZE + 2]; vm_paddr_t dump_avail[PHYS_AVAIL_SIZE + 2]; int early_boot = 1; int cold = 1; long realmem = 0; long Maxmem = 0; #define DTB_SIZE_MAX (1024 * 1024) #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1)) vm_paddr_t physmap[PHYSMAP_SIZE]; u_int physmap_idx; struct kva_md_info kmi; int64_t dcache_line_size; /* The minimum D cache line size */ int64_t icache_line_size; /* The minimum I cache line size */ int64_t idcache_line_size; /* The minimum cache line size */ extern int *end; extern int *initstack_end; struct pcpu *pcpup; uintptr_t mcall_trap(uintptr_t mcause, uintptr_t* regs); uintptr_t mcall_trap(uintptr_t mcause, uintptr_t* regs) { return (0); } static void cpu_startup(void *dummy) { identify_cpu(); vm_ksubmap_init(&kmi); bufinit(); vm_pager_bufferinit(); } SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL); int cpu_idle_wakeup(int cpu) { return (0); } int fill_regs(struct thread *td, struct reg *regs) { struct trapframe *frame; frame = td->td_frame; regs->sepc = frame->tf_sepc; regs->sstatus = frame->tf_sstatus; regs->ra = frame->tf_ra; regs->sp = frame->tf_sp; regs->gp = frame->tf_gp; regs->tp = frame->tf_tp; memcpy(regs->t, frame->tf_t, sizeof(regs->t)); memcpy(regs->s, frame->tf_s, sizeof(regs->s)); memcpy(regs->a, frame->tf_a, sizeof(regs->a)); return (0); } int set_regs(struct thread *td, struct reg *regs) { struct trapframe *frame; frame = td->td_frame; frame->tf_sepc = regs->sepc; frame->tf_sstatus = regs->sstatus; frame->tf_ra = regs->ra; frame->tf_sp = regs->sp; frame->tf_gp = regs->gp; frame->tf_tp = regs->tp; memcpy(frame->tf_t, regs->t, sizeof(frame->tf_t)); memcpy(frame->tf_s, regs->s, sizeof(frame->tf_s)); memcpy(frame->tf_a, regs->a, sizeof(frame->tf_a)); return (0); } int fill_fpregs(struct thread *td, struct fpreg *regs) { #ifdef FPE struct pcb *pcb; pcb = td->td_pcb; if ((pcb->pcb_fpflags & PCB_FP_STARTED) != 0) { /* * If we have just been running FPE instructions we will * need to save the state to memcpy it below. */ fpe_state_save(td); memcpy(regs->fp_x, pcb->pcb_x, sizeof(regs->fp_x)); regs->fp_fcsr = pcb->pcb_fcsr; } else #endif memset(regs->fp_x, 0, sizeof(regs->fp_x)); return (0); } int set_fpregs(struct thread *td, struct fpreg *regs) { #ifdef FPE struct pcb *pcb; pcb = td->td_pcb; memcpy(pcb->pcb_x, regs->fp_x, sizeof(regs->fp_x)); pcb->pcb_fcsr = regs->fp_fcsr; #endif return (0); } int fill_dbregs(struct thread *td, struct dbreg *regs) { panic("fill_dbregs"); } int set_dbregs(struct thread *td, struct dbreg *regs) { panic("set_dbregs"); } int ptrace_set_pc(struct thread *td, u_long addr) { panic("ptrace_set_pc"); return (0); } int ptrace_single_step(struct thread *td) { /* TODO; */ return (0); } int ptrace_clear_single_step(struct thread *td) { /* TODO; */ return (0); } void exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) { struct trapframe *tf; struct pcb *pcb; tf = td->td_frame; pcb = td->td_pcb; memset(tf, 0, sizeof(struct trapframe)); tf->tf_a[0] = stack; tf->tf_sp = STACKALIGN(stack); tf->tf_ra = imgp->entry_addr; tf->tf_sepc = imgp->entry_addr; pcb->pcb_fpflags &= ~PCB_FP_STARTED; } /* Sanity check these are the same size, they will be memcpy'd to and fro */ CTASSERT(sizeof(((struct trapframe *)0)->tf_a) == sizeof((struct gpregs *)0)->gp_a); CTASSERT(sizeof(((struct trapframe *)0)->tf_s) == sizeof((struct gpregs *)0)->gp_s); CTASSERT(sizeof(((struct trapframe *)0)->tf_t) == sizeof((struct gpregs *)0)->gp_t); CTASSERT(sizeof(((struct trapframe *)0)->tf_a) == sizeof((struct reg *)0)->a); CTASSERT(sizeof(((struct trapframe *)0)->tf_s) == sizeof((struct reg *)0)->s); CTASSERT(sizeof(((struct trapframe *)0)->tf_t) == sizeof((struct reg *)0)->t); /* Support for FDT configurations only. */ CTASSERT(FDT); int get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret) { struct trapframe *tf = td->td_frame; memcpy(mcp->mc_gpregs.gp_t, tf->tf_t, sizeof(mcp->mc_gpregs.gp_t)); memcpy(mcp->mc_gpregs.gp_s, tf->tf_s, sizeof(mcp->mc_gpregs.gp_s)); memcpy(mcp->mc_gpregs.gp_a, tf->tf_a, sizeof(mcp->mc_gpregs.gp_a)); if (clear_ret & GET_MC_CLEAR_RET) { mcp->mc_gpregs.gp_a[0] = 0; mcp->mc_gpregs.gp_t[0] = 0; /* clear syscall error */ } mcp->mc_gpregs.gp_ra = tf->tf_ra; mcp->mc_gpregs.gp_sp = tf->tf_sp; mcp->mc_gpregs.gp_gp = tf->tf_gp; mcp->mc_gpregs.gp_tp = tf->tf_tp; mcp->mc_gpregs.gp_sepc = tf->tf_sepc; mcp->mc_gpregs.gp_sstatus = tf->tf_sstatus; return (0); } int set_mcontext(struct thread *td, mcontext_t *mcp) { struct trapframe *tf; tf = td->td_frame; memcpy(tf->tf_t, mcp->mc_gpregs.gp_t, sizeof(tf->tf_t)); memcpy(tf->tf_s, mcp->mc_gpregs.gp_s, sizeof(tf->tf_s)); memcpy(tf->tf_a, mcp->mc_gpregs.gp_a, sizeof(tf->tf_a)); tf->tf_ra = mcp->mc_gpregs.gp_ra; tf->tf_sp = mcp->mc_gpregs.gp_sp; tf->tf_gp = mcp->mc_gpregs.gp_gp; tf->tf_tp = mcp->mc_gpregs.gp_tp; tf->tf_sepc = mcp->mc_gpregs.gp_sepc; tf->tf_sstatus = mcp->mc_gpregs.gp_sstatus; return (0); } static void get_fpcontext(struct thread *td, mcontext_t *mcp) { #ifdef FPE struct pcb *curpcb; critical_enter(); curpcb = curthread->td_pcb; KASSERT(td->td_pcb == curpcb, ("Invalid fpe pcb")); if ((curpcb->pcb_fpflags & PCB_FP_STARTED) != 0) { /* * If we have just been running FPE instructions we will * need to save the state to memcpy it below. */ fpe_state_save(td); KASSERT((curpcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0, ("Non-userspace FPE flags set in get_fpcontext")); memcpy(mcp->mc_fpregs.fp_x, curpcb->pcb_x, sizeof(mcp->mc_fpregs)); mcp->mc_fpregs.fp_fcsr = curpcb->pcb_fcsr; mcp->mc_fpregs.fp_flags = curpcb->pcb_fpflags; mcp->mc_flags |= _MC_FP_VALID; } critical_exit(); #endif } static void set_fpcontext(struct thread *td, mcontext_t *mcp) { #ifdef FPE struct pcb *curpcb; critical_enter(); if ((mcp->mc_flags & _MC_FP_VALID) != 0) { curpcb = curthread->td_pcb; /* FPE usage is enabled, override registers. */ memcpy(curpcb->pcb_x, mcp->mc_fpregs.fp_x, sizeof(mcp->mc_fpregs)); curpcb->pcb_fcsr = mcp->mc_fpregs.fp_fcsr; curpcb->pcb_fpflags = mcp->mc_fpregs.fp_flags & PCB_FP_USERMASK; } critical_exit(); #endif } void cpu_idle(int busy) { spinlock_enter(); if (!busy) cpu_idleclock(); if (!sched_runnable()) __asm __volatile( "fence \n" "wfi \n"); if (!busy) cpu_activeclock(); spinlock_exit(); } void cpu_halt(void) { panic("cpu_halt"); } /* * Flush the D-cache for non-DMA I/O so that the I-cache can * be made coherent later. */ void cpu_flush_dcache(void *ptr, size_t len) { /* TBD */ } /* Get current clock frequency for the given CPU ID. */ int cpu_est_clockrate(int cpu_id, uint64_t *rate) { panic("cpu_est_clockrate"); } void cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) { } void spinlock_enter(void) { struct thread *td; td = curthread; if (td->td_md.md_spinlock_count == 0) { td->td_md.md_spinlock_count = 1; td->td_md.md_saved_sstatus_ie = intr_disable(); } else td->td_md.md_spinlock_count++; critical_enter(); } void spinlock_exit(void) { struct thread *td; register_t sstatus_ie; td = curthread; critical_exit(); sstatus_ie = td->td_md.md_saved_sstatus_ie; td->td_md.md_spinlock_count--; if (td->td_md.md_spinlock_count == 0) intr_restore(sstatus_ie); } #ifndef _SYS_SYSPROTO_H_ struct sigreturn_args { ucontext_t *ucp; }; #endif int sys_sigreturn(struct thread *td, struct sigreturn_args *uap) { uint64_t sstatus; ucontext_t uc; int error; if (uap == NULL) return (EFAULT); if (copyin(uap->sigcntxp, &uc, sizeof(uc))) return (EFAULT); /* * Make sure the processor mode has not been tampered with and * interrupts have not been disabled. * Supervisor interrupts in user mode are always enabled. */ sstatus = uc.uc_mcontext.mc_gpregs.gp_sstatus; if ((sstatus & SSTATUS_SPP) != 0) return (EINVAL); error = set_mcontext(td, &uc.uc_mcontext); if (error != 0) return (error); set_fpcontext(td, &uc.uc_mcontext); /* Restore signal mask. */ kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0); return (EJUSTRETURN); } /* * Construct a PCB from a trapframe. This is called from kdb_trap() where * we want to start a backtrace from the function that caused us to enter * the debugger. We have the context in the trapframe, but base the trace * on the PCB. The PCB doesn't have to be perfect, as long as it contains * enough for a backtrace. */ void makectx(struct trapframe *tf, struct pcb *pcb) { memcpy(pcb->pcb_t, tf->tf_t, sizeof(tf->tf_t)); memcpy(pcb->pcb_s, tf->tf_s, sizeof(tf->tf_s)); memcpy(pcb->pcb_a, tf->tf_a, sizeof(tf->tf_a)); pcb->pcb_ra = tf->tf_ra; pcb->pcb_sp = tf->tf_sp; pcb->pcb_gp = tf->tf_gp; pcb->pcb_tp = tf->tf_tp; pcb->pcb_sepc = tf->tf_sepc; } void sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) { struct sigframe *fp, frame; struct sysentvec *sysent; struct trapframe *tf; struct sigacts *psp; struct thread *td; struct proc *p; int onstack; - int code; int sig; td = curthread; p = td->td_proc; PROC_LOCK_ASSERT(p, MA_OWNED); sig = ksi->ksi_signo; - code = ksi->ksi_code; psp = p->p_sigacts; mtx_assert(&psp->ps_mtx, MA_OWNED); tf = td->td_frame; onstack = sigonstack(tf->tf_sp); CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm, catcher, sig); /* Allocate and validate space for the signal handler context. */ if ((td->td_pflags & TDP_ALTSTACK) != 0 && !onstack && SIGISMEMBER(psp->ps_sigonstack, sig)) { fp = (struct sigframe *)((uintptr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size); } else { fp = (struct sigframe *)td->td_frame->tf_sp; } /* Make room, keeping the stack aligned */ fp--; fp = (struct sigframe *)STACKALIGN(fp); /* Fill in the frame to copy out */ get_mcontext(td, &frame.sf_uc.uc_mcontext, 0); get_fpcontext(td, &frame.sf_uc.uc_mcontext); frame.sf_si = ksi->ksi_info; frame.sf_uc.uc_sigmask = *mask; frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE; frame.sf_uc.uc_stack = td->td_sigstk; mtx_unlock(&psp->ps_mtx); PROC_UNLOCK(td->td_proc); /* Copy the sigframe out to the user's stack. */ if (copyout(&frame, fp, sizeof(*fp)) != 0) { /* Process has trashed its stack. Kill it. */ CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp); PROC_LOCK(p); sigexit(td, SIGILL); } tf->tf_a[0] = sig; tf->tf_a[1] = (register_t)&fp->sf_si; tf->tf_a[2] = (register_t)&fp->sf_uc; tf->tf_sepc = (register_t)catcher; tf->tf_sp = (register_t)fp; sysent = p->p_sysent; if (sysent->sv_sigcode_base != 0) tf->tf_ra = (register_t)sysent->sv_sigcode_base; else tf->tf_ra = (register_t)(sysent->sv_psstrings - *(sysent->sv_szsigcode)); CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_sepc, tf->tf_sp); PROC_LOCK(p); mtx_lock(&psp->ps_mtx); } static void init_proc0(vm_offset_t kstack) { pcpup = &__pcpu[0]; proc_linkup0(&proc0, &thread0); thread0.td_kstack = kstack; thread0.td_pcb = (struct pcb *)(thread0.td_kstack) - 1; thread0.td_pcb->pcb_fpflags = 0; thread0.td_frame = &proc0_tf; pcpup->pc_curpcb = thread0.td_pcb; } static int add_physmap_entry(uint64_t base, uint64_t length, vm_paddr_t *physmap, u_int *physmap_idxp) { u_int i, insert_idx, _physmap_idx; _physmap_idx = *physmap_idxp; if (length == 0) return (1); /* * Find insertion point while checking for overlap. Start off by * assuming the new entry will be added to the end. */ insert_idx = _physmap_idx; for (i = 0; i <= _physmap_idx; i += 2) { if (base < physmap[i + 1]) { if (base + length <= physmap[i]) { insert_idx = i; break; } if (boothowto & RB_VERBOSE) printf( "Overlapping memory regions, ignoring second region\n"); return (1); } } /* See if we can prepend to the next entry. */ if (insert_idx <= _physmap_idx && base + length == physmap[insert_idx]) { physmap[insert_idx] = base; return (1); } /* See if we can append to the previous entry. */ if (insert_idx > 0 && base == physmap[insert_idx - 1]) { physmap[insert_idx - 1] += length; return (1); } _physmap_idx += 2; *physmap_idxp = _physmap_idx; if (_physmap_idx == PHYSMAP_SIZE) { printf( "Too many segments in the physical address map, giving up\n"); return (0); } /* * Move the last 'N' entries down to make room for the new * entry if needed. */ for (i = _physmap_idx; i > insert_idx; i -= 2) { physmap[i] = physmap[i - 2]; physmap[i + 1] = physmap[i - 1]; } /* Insert the new entry. */ physmap[insert_idx] = base; physmap[insert_idx + 1] = base + length; printf("physmap[%d] = 0x%016lx\n", insert_idx, base); printf("physmap[%d] = 0x%016lx\n", insert_idx + 1, base + length); return (1); } #ifdef FDT static void try_load_dtb(caddr_t kmdp, vm_offset_t dtbp) { #if defined(FDT_DTB_STATIC) dtbp = (vm_offset_t)&fdt_static_dtb; #endif if (dtbp == (vm_offset_t)NULL) { printf("ERROR loading DTB\n"); return; } if (OF_install(OFW_FDT, 0) == FALSE) panic("Cannot install FDT"); if (OF_init((void *)dtbp) != 0) panic("OF_init failed with the found device tree"); } #endif static void cache_setup(void) { /* TODO */ } /* * Fake up a boot descriptor table. * RISCVTODO: This needs to be done via loader (when it's available). */ vm_offset_t fake_preload_metadata(struct riscv_bootparams *rvbp __unused) { #ifdef DDB vm_offset_t zstart = 0, zend = 0; #endif vm_offset_t lastaddr; int i = 0; static uint32_t fake_preload[35]; fake_preload[i++] = MODINFO_NAME; fake_preload[i++] = strlen("kernel") + 1; strcpy((char*)&fake_preload[i++], "kernel"); i += 1; fake_preload[i++] = MODINFO_TYPE; fake_preload[i++] = strlen("elf64 kernel") + 1; strcpy((char*)&fake_preload[i++], "elf64 kernel"); i += 3; fake_preload[i++] = MODINFO_ADDR; fake_preload[i++] = sizeof(vm_offset_t); fake_preload[i++] = (uint64_t)(KERNBASE + KERNENTRY); i += 1; fake_preload[i++] = MODINFO_SIZE; fake_preload[i++] = sizeof(uint64_t); printf("end is 0x%016lx\n", (uint64_t)&end); fake_preload[i++] = (uint64_t)&end - (uint64_t)(KERNBASE + KERNENTRY); i += 1; #ifdef DDB #if 0 /* RISCVTODO */ if (*(uint32_t *)KERNVIRTADDR == MAGIC_TRAMP_NUMBER) { fake_preload[i++] = MODINFO_METADATA|MODINFOMD_SSYM; fake_preload[i++] = sizeof(vm_offset_t); fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 4); fake_preload[i++] = MODINFO_METADATA|MODINFOMD_ESYM; fake_preload[i++] = sizeof(vm_offset_t); fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 8); lastaddr = *(uint32_t *)(KERNVIRTADDR + 8); zend = lastaddr; zstart = *(uint32_t *)(KERNVIRTADDR + 4); db_fetch_ksymtab(zstart, zend); } else #endif #endif lastaddr = (vm_offset_t)&end; fake_preload[i++] = 0; fake_preload[i] = 0; preload_metadata = (void *)fake_preload; return (lastaddr); } void initriscv(struct riscv_bootparams *rvbp) { struct mem_region mem_regions[FDT_MEM_REGIONS]; vm_offset_t rstart, rend; vm_offset_t s, e; int mem_regions_sz; vm_offset_t lastaddr; vm_size_t kernlen; caddr_t kmdp; int i; /* Set the module data location */ lastaddr = fake_preload_metadata(rvbp); /* Find the kernel address */ kmdp = preload_search_by_type("elf kernel"); if (kmdp == NULL) kmdp = preload_search_by_type("elf64 kernel"); boothowto = RB_VERBOSE | RB_SINGLE; boothowto = RB_VERBOSE; kern_envp = NULL; #ifdef FDT try_load_dtb(kmdp, rvbp->dtbp_virt); #endif /* Load the physical memory ranges */ physmap_idx = 0; #ifdef FDT /* Grab physical memory regions information from device tree. */ if (fdt_get_mem_regions(mem_regions, &mem_regions_sz, NULL) != 0) panic("Cannot get physical memory regions"); s = rvbp->dtbp_phys; e = s + DTB_SIZE_MAX; for (i = 0; i < mem_regions_sz; i++) { rstart = mem_regions[i].mr_start; rend = (mem_regions[i].mr_start + mem_regions[i].mr_size); if ((rstart < s) && (rend > e)) { /* Exclude DTB region. */ add_physmap_entry(rstart, (s - rstart), physmap, &physmap_idx); add_physmap_entry(e, (rend - e), physmap, &physmap_idx); } else { add_physmap_entry(mem_regions[i].mr_start, mem_regions[i].mr_size, physmap, &physmap_idx); } } #endif /* Set the pcpu data, this is needed by pmap_bootstrap */ pcpup = &__pcpu[0]; pcpu_init(pcpup, 0, sizeof(struct pcpu)); /* Set the pcpu pointer */ __asm __volatile("mv gp, %0" :: "r"(pcpup)); PCPU_SET(curthread, &thread0); /* Do basic tuning, hz etc */ init_param1(); cache_setup(); /* Bootstrap enough of pmap to enter the kernel proper */ kernlen = (lastaddr - KERNBASE); pmap_bootstrap(rvbp->kern_l1pt, mem_regions[0].mr_start, kernlen); cninit(); init_proc0(rvbp->kern_stack); /* set page table base register for thread0 */ thread0.td_pcb->pcb_l1addr = \ (rvbp->kern_l1pt - KERNBASE + rvbp->kern_phys); msgbufinit(msgbufp, msgbufsize); mutex_init(); init_param2(physmem); kdb_init(); early_boot = 0; } #undef bzero void bzero(void *buf, size_t len) { uint8_t *p; p = buf; while(len-- > 0) *p++ = 0; }