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Clean up RFLAG and CR3 register handling and nearby comments. For BSP, use

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spinlock_enter()/spinlock_exit() to save/restore RFLAGS.  We know interrupt
is disabled when returning from S3.  For AP, we do not have to save/restore
it because IRET will do it for us any way.  Do not save CR3 locally because
savectx() does it and BSP does not have to switch to kernel map for amd64.
Change contigmalloc(9) flag while I am in the neighborhood.
This commit is contained in:
Jung-uk Kim 2012-02-15 23:33:22 +00:00
parent 5644ccec61
commit 4ba4ebd0a8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=231797
2 changed files with 6 additions and 20 deletions
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17
sys/amd64/acpica/acpi_wakeup.c
View file

@ -223,7 +223,6 @@ acpi_sleep_machdep(struct acpi_softc *sc, int state)
#ifdef SMP
cpuset_t wakeup_cpus;
#endif
register_t cr3, rf;
ACPI_STATUS status;
int ret;
@ -255,17 +254,9 @@ acpi_sleep_machdep(struct acpi_softc *sc, int state)
AcpiSetFirmwareWakingVector(WAKECODE_PADDR(sc));
rf = intr_disable();
spinlock_enter();
intr_suspend();
/*
* Temporarily switch to the kernel pmap because it provides
* an identity mapping (setup at boot) for the low physical
* memory region containing the wakeup code.
*/
cr3 = rcr3();
load_cr3(KPML4phys);
if (savectx(susppcbs[0])) {
ctx_fpusave(suspfpusave[0]);
#ifdef SMP
@ -304,6 +295,7 @@ acpi_sleep_machdep(struct acpi_softc *sc, int state)
ia32_pause();
} else {
pmap_init_pat();
load_cr3(susppcbs[0]->pcb_cr3);
PCPU_SET(switchtime, 0);
PCPU_SET(switchticks, ticks);
#ifdef SMP
@ -319,10 +311,9 @@ acpi_sleep_machdep(struct acpi_softc *sc, int state)
restart_cpus(wakeup_cpus);
#endif
load_cr3(cr3);
mca_resume();
intr_resume();
intr_restore(rf);
spinlock_exit();
AcpiSetFirmwareWakingVector(0);
@ -346,7 +337,7 @@ acpi_alloc_wakeup_handler(void)
* and ROM area (0xa0000 and above). The temporary page tables must be
* page-aligned.
*/
wakeaddr = contigmalloc(4 * PAGE_SIZE, M_DEVBUF, M_NOWAIT, 0x500,
wakeaddr = contigmalloc(4 * PAGE_SIZE, M_DEVBUF, M_WAITOK, 0x500,
0xa0000, PAGE_SIZE, 0ul);
if (wakeaddr == NULL) {
printf("%s: can't alloc wake memory\n", __func__);

9
sys/amd64/amd64/mp_machdep.c
View file

@ -1414,20 +1414,17 @@ cpustop_handler(void)
void
cpususpend_handler(void)
{
register_t cr3, rf;
u_int cpu;
cpu = PCPU_GET(cpuid);
rf = intr_disable();
cr3 = rcr3();
if (savectx(susppcbs[cpu])) {
ctx_fpusave(suspfpusave[cpu]);
wbinvd();
CPU_SET_ATOMIC(cpu, &stopped_cpus);
} else {
pmap_init_pat();
load_cr3(susppcbs[cpu]->pcb_cr3);
PCPU_SET(switchtime, 0);
PCPU_SET(switchticks, ticks);
}
@ -1439,11 +1436,9 @@ cpususpend_handler(void)
CPU_CLR_ATOMIC(cpu, &started_cpus);
CPU_CLR_ATOMIC(cpu, &stopped_cpus);
/* Restore CR3 and enable interrupts */
load_cr3(cr3);
/* Resume MCA and local APIC */
mca_resume();
lapic_setup(0);
intr_restore(rf);
}
/*