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Differential D31954 Diff 95462 sys/amd64/amd64/machdep.c

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sys/amd64/amd64/machdep.c

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* couple of scratch registers, as well as the trapframe left behind after an * couple of scratch registers, as well as the trapframe left behind after an
* iret fault. * iret fault.
*/ */
CTASSERT(PC_PTI_STACK_SZ * sizeof(register_t) >= 2 * sizeof(struct pti_frame) - CTASSERT(PC_PTI_STACK_SZ * sizeof(register_t) >= 2 * sizeof(struct pti_frame) -
offsetof(struct pti_frame, pti_rip)); offsetof(struct pti_frame, pti_rip));
extern u_int64_t hammer_time(u_int64_t, u_int64_t); extern u_int64_t hammer_time(u_int64_t, u_int64_t);
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
static void cpu_startup(void *); static void cpu_startup(void *);
static void get_fpcontext(struct thread *td, mcontext_t *mcp, static void get_fpcontext(struct thread *td, mcontext_t *mcp,
char *xfpusave, size_t xfpusave_len); char *xfpusave, size_t xfpusave_len);
static int set_fpcontext(struct thread *td, mcontext_t *mcp, static int set_fpcontext(struct thread *td, mcontext_t *mcp,
char *xfpustate, size_t xfpustate_len); char *xfpustate, size_t xfpustate_len);
SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL); SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
/* Preload data parse function */ /* Preload data parse function */
▲ Show 20 Lines • Show All 1,725 Lines • ▼ Show 20 Lines#endif
thread0.td_pcb->pcb_save = get_pcb_user_save_td(&thread0); thread0.td_pcb->pcb_save = get_pcb_user_save_td(&thread0);
bzero(thread0.td_pcb->pcb_save, cpu_max_ext_state_size); bzero(thread0.td_pcb->pcb_save, cpu_max_ext_state_size);
if (use_xsave) { if (use_xsave) {
xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) + xhdr = (struct xstate_hdr *)(get_pcb_user_save_td(&thread0) +
1); 1);
xhdr->xstate_bv = xsave_mask; xhdr->xstate_bv = xsave_mask;
} }
/* make an initial tss so cpu can get interrupt stack on syscall! */ /* make an initial tss so cpu can get interrupt stack on syscall! */
rsp0 = thread0.td_md.md_stack_base; rsp0 = thread0.td_md.md_stack_base;
markjUnsubmitted
Done
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Aren't we relying on the set_top_of_stack_td() call here?

markj: Aren't we relying on the set_top_of_stack_td() call here?
kibAuthorUnsubmitted
Done
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Yes, it is done at line 1503 above.

kib: Yes, it is done at line 1503 above.
/* Ensure the stack is aligned to 16 bytes */ /* Ensure the stack is aligned to 16 bytes */
rsp0 &= ~0xFul; rsp0 &= ~0xFul;
PCPU_PTR(common_tss)->tss_rsp0 = rsp0; PCPU_PTR(common_tss)->tss_rsp0 = rsp0;
amd64_bsp_pcpu_init2(rsp0); amd64_bsp_pcpu_init2(rsp0);
/* transfer to user mode */ /* transfer to user mode */
_ucodesel = GSEL(GUCODE_SEL, SEL_UPL); _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
Show All 37 Linescpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
pcpu->pc_acpi_id = 0xffffffff; pcpu->pc_acpi_id = 0xffffffff;
} }
static int static int
smap_sysctl_handler(SYSCTL_HANDLER_ARGS) smap_sysctl_handler(SYSCTL_HANDLER_ARGS)
{ {
struct bios_smap *smapbase; struct bios_smap *smapbase;
struct bios_smap_xattr smap; struct bios_smap_xattr smap;
caddr_t kmdp; caddr_t kmdp;
markjUnsubmitted
Done
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Why do we zero the entire save area for thread0 but not for other threads?

markj: Why do we zero the entire save area for thread0 but not for other threads?
kibAuthorUnsubmitted
Done
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This is just historic. I removed thread0_init_fpu_state() so this question should become not important.

kib: This is just historic. I removed thread0_init_fpu_state() so this question should become not…
uint32_t *smapattr; uint32_t *smapattr;
int count, error, i; int count, error, i;
/* Retrieve the system memory map from the loader. */ /* Retrieve the system memory map from the loader. */
kmdp = preload_search_by_type("elf kernel"); kmdp = preload_search_by_type("elf kernel");
if (kmdp == NULL) if (kmdp == NULL)
kmdp = preload_search_by_type("elf64 kernel"); kmdp = preload_search_by_type("elf64 kernel");
smapbase = (struct bios_smap *)preload_search_info(kmdp, smapbase = (struct bios_smap *)preload_search_info(kmdp,
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