diff options
| author | Stefan Fritsch <sf@cvs.openbsd.org> | 2015-09-11 14:26:13 +0000 |
|---|---|---|
| committer | Stefan Fritsch <sf@cvs.openbsd.org> | 2015-09-11 14:26:13 +0000 |
| commit | 087bd0466492520e20b5013d2266267e903e46b4 (patch) | |
| tree | 5c4cc495cbc8023169e6d67adbef570ba2333cb1 /sys/arch | |
| parent | 8ef3153da8bdf8e09981342d639964f2330bccb5 (diff) | |
Save/restore MSR_APICBASE during suspend/resume
This register contains the x2apic enable bit. Restoring it re-enables x2apic on
the application processors at resume. On the boot processor, the normal
initialization code path is used.
Tested by many
OK mlarkin@
"Go for it" deraadt@
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/amd64/amd64/acpi_wakecode.S | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/sys/arch/amd64/amd64/acpi_wakecode.S b/sys/arch/amd64/amd64/acpi_wakecode.S index 0f2626476a8..68fe65b83af 100644 --- a/sys/arch/amd64/amd64/acpi_wakecode.S +++ b/sys/arch/amd64/amd64/acpi_wakecode.S @@ -1,4 +1,4 @@ -/* $OpenBSD: acpi_wakecode.S,v 1.36 2015/06/22 20:06:11 bluhm Exp $ */ +/* $OpenBSD: acpi_wakecode.S,v 1.37 2015/09/11 14:26:12 sf Exp $ */ /* * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org> * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> @@ -52,6 +52,7 @@ #include <machine/param.h> #include <machine/segments.h> #include <dev/acpi/acpivar.h> +#include "lapic.h" #define _ACPI_TRMP_LABEL(a) a = . - _C_LABEL(acpi_real_mode_resume) + \ ACPI_TRAMPOLINE @@ -245,6 +246,13 @@ _C_LABEL(acpi_long_mode_resume): movw %ax, %gs /* Restore registers - start with the MSRs */ +#if NLAPIC > 0 + movl $MSR_APICBASE, %ecx + movl acpi_saved_apicbase, %eax + movl acpi_saved_apicbase+4, %edx + wrmsr +#endif + movl $MSR_STAR, %ecx movl acpi_saved_star, %eax movl acpi_saved_star+4, %edx @@ -623,6 +631,10 @@ _ACPI_TRMP_DATA_LABEL(acpi_saved_cstar) .quad 0 _ACPI_TRMP_DATA_LABEL(acpi_saved_sfmask) .quad 0 +#if NLAPIC > 0 +_ACPI_TRMP_DATA_LABEL(acpi_saved_apicbase) + .quad 0 +#endif .align 4 _ACPI_TRMP_DATA_LABEL(acpi_pdirpa) @@ -682,6 +694,13 @@ NENTRY(acpi_savecpu) pushq %rcx pushq %rdx +#if NLAPIC > 0 + movl $MSR_APICBASE, %ecx + rdmsr + movl %eax, acpi_saved_apicbase + movl %edx, acpi_saved_apicbase+4 +#endif + movl $MSR_STAR, %ecx rdmsr movl %eax, acpi_saved_star |