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amd64: Handle 5-level paging on wakeup.

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We can switch into long mode directly with LA57 enabled.

Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D25273
This commit is contained in:
kib 2020-08-23 20:43:23 +00:00
parent f770d93b45
commit 94cc06b8c6
3 changed files with 31 additions and 9 deletions
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13
sys/amd64/acpica/acpi_wakecode.S
View File

@ -148,10 +148,18 @@ wakeup_32:
mov $bootdata32 - bootgdt, %eax
mov %ax, %ds
/* Turn on the PAE bit for when paging is enabled */
/*
* Turn on the PAE bit and optionally the LA57 bit for when paging
* is later enabled.
*/
mov %cr4, %eax
orl $CR4_PAE, %eax
mov %eax, %cr4
leal wakeup_pagetables - wakeup_start(%ebx), %ecx
movl (%ecx), %ecx
testl $0x1, %ecx
je 1f
orl $CR4_LA57, %eax
1: mov %eax, %cr4
/*
* Enable EFER.LME so that we get long mode when all the prereqs are
@ -174,6 +182,7 @@ wakeup_32:
*/
leal wakeup_pagetables - wakeup_start(%ebx), %eax
movl (%eax), %eax
andl $~0x1, %eax
mov %eax, %cr3
/*

5
sys/amd64/amd64/cpu_switch.S
View File

@ -382,8 +382,11 @@ END(savectx)
* Resuming processor state from pcb.
*/
ENTRY(resumectx)
/* Switch to KPML4phys. */
/* Switch to KPML5/4phys. */
movq KPML4phys,%rax
movq KPML5phys,%rcx
cmpl $0, la57
cmovne %rcx, %rax
movq %rax,%cr3
/* Force kernel segment registers. */

22
sys/x86/acpica/acpi_wakeup.c
View File

@ -99,7 +99,7 @@ static void acpi_wakeup_cpus(struct acpi_softc *);
#endif
#ifdef __amd64__
#define ACPI_WAKEPAGES 4
#define ACPI_WAKEPAGES 5
#else
#define ACPI_WAKEPAGES 1
#endif
@ -414,8 +414,8 @@ acpi_install_wakeup_handler(struct acpi_softc *sc)
static void *wakeaddr;
void *wakepages[ACPI_WAKEPAGES];
#ifdef __amd64__
uint64_t *pt4, *pt3, *pt2;
vm_paddr_t pt4pa, pt3pa, pt2pa;
uint64_t *pt5, *pt4, *pt3, *pt2;
vm_paddr_t pt5pa, pt4pa, pt3pa, pt2pa;
int i;
#endif
@ -430,6 +430,10 @@ acpi_install_wakeup_handler(struct acpi_softc *sc)
sc->acpi_wakephys = vtophys(wakeaddr);
#ifdef __amd64__
if (la57) {
pt5 = wakepages[4];
pt5pa = vtophys(pt5);
}
pt4 = wakepages[1];
pt3 = wakepages[2];
pt2 = wakepages[3];
@ -448,7 +452,8 @@ acpi_install_wakeup_handler(struct acpi_softc *sc)
#ifdef __amd64__
WAKECODE_FIXUP((wakeup_sw64 + 1), uint32_t,
sc->acpi_wakephys + wakeup_64);
WAKECODE_FIXUP(wakeup_pagetables, uint32_t, pt4pa);
WAKECODE_FIXUP(wakeup_pagetables, uint32_t, la57 ? (pt5pa | 0x1) :
pt4pa);
#endif
/* Save pointers to some global data. */
@ -457,7 +462,12 @@ acpi_install_wakeup_handler(struct acpi_softc *sc)
WAKECODE_FIXUP(wakeup_cr3, register_t, pmap_get_kcr3());
#else /* __amd64__ */
/* Create the initial 1GB replicated page tables */
for (i = 0; i < 512; i++) {
for (i = 0; i < NPTEPG; i++) {
if (la57) {
pt5[i] = (uint64_t)pt4pa;
pt5[i] |= PG_V | PG_RW | PG_U;
}
/*
* Each slot of the level 4 pages points
* to the same level 3 page
@ -473,7 +483,7 @@ acpi_install_wakeup_handler(struct acpi_softc *sc)
pt3[i] |= PG_V | PG_RW | PG_U;
/* The level 2 page slots are mapped with 2MB pages for 1GB. */
pt2[i] = i * (2 * 1024 * 1024);
pt2[i] = i * NBPDR;
pt2[i] |= PG_V | PG_RW | PG_PS | PG_U;
}
#endif /* !__amd64__ */