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Date: Tue, 1 Aug 2006 05:03:39 -0600 From: "Eric W. Biederman" <ebiederm@...ssion.com> To: <fastboot@...l.org> Cc: <linux-kernel@...r.kernel.org>, Horms <horms@...ge.net.au>, Jan Kratochvil <lace@...kratochvil.net>, "H. Peter Anvin" <hpa@...or.com>, Magnus Damm <magnus.damm@...il.com>, Vivek Goyal <vgoyal@...ibm.com>, Linda Wang <lwang@...hat.com>, "Eric W. Biederman" <ebiederm@...ssion.com> Subject: [PATCH 24/33] x86_64: Add EFER to the set registers saved by save_processor_state EFER varies like %cr4 depending on the cpu capabilities, and which cpu capabilities we want to make use of. So save/restore it make certain we have the same EFER value when we are done. Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com> --- arch/x86_64/kernel/suspend.c | 3 ++- include/asm-x86_64/suspend.h | 1 + 2 files changed, 3 insertions(+), 1 deletions(-) diff --git a/arch/x86_64/kernel/suspend.c b/arch/x86_64/kernel/suspend.c index 91f7e67..fe865ea 100644 --- a/arch/x86_64/kernel/suspend.c +++ b/arch/x86_64/kernel/suspend.c @@ -33,7 +33,6 @@ void __save_processor_state(struct saved asm volatile ("str %0" : "=m" (ctxt->tr)); /* XMM0..XMM15 should be handled by kernel_fpu_begin(). */ - /* EFER should be constant for kernel version, no need to handle it. */ /* * segment registers */ @@ -50,6 +49,7 @@ void __save_processor_state(struct saved /* * control registers */ + rdmsrl(MSR_EFER, ctxt->efer); asm volatile ("movq %%cr0, %0" : "=r" (ctxt->cr0)); asm volatile ("movq %%cr2, %0" : "=r" (ctxt->cr2)); asm volatile ("movq %%cr3, %0" : "=r" (ctxt->cr3)); @@ -75,6 +75,7 @@ void __restore_processor_state(struct sa /* * control registers */ + wrmsrl(MSR_EFER, ctxt->efer); asm volatile ("movq %0, %%cr8" :: "r" (ctxt->cr8)); asm volatile ("movq %0, %%cr4" :: "r" (ctxt->cr4)); asm volatile ("movq %0, %%cr3" :: "r" (ctxt->cr3)); diff --git a/include/asm-x86_64/suspend.h b/include/asm-x86_64/suspend.h index bc7f817..a42306c 100644 --- a/include/asm-x86_64/suspend.h +++ b/include/asm-x86_64/suspend.h @@ -17,6 +17,7 @@ struct saved_context { u16 ds, es, fs, gs, ss; unsigned long gs_base, gs_kernel_base, fs_base; unsigned long cr0, cr2, cr3, cr4, cr8; + unsigned long efer; u16 gdt_pad; u16 gdt_limit; unsigned long gdt_base; -- 1.4.2.rc2.g5209e - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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