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| author | Vivek Goyal <vgoyal@in.ibm.com> | 2007-05-02 19:27:07 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 19:27:07 +0200 |
| commit | 3c321bceb4a626639ab43a5a24d884930e511826 (patch) | |
| tree | eba7e14b27ee28bf2b2415fa43563aed9b0538a6 /arch/x86_64/kernel/suspend.c | |
| parent | 30f472895401fbe8e64f861a2569bc9acb098741 (diff) | |
| download | lwn-3c321bceb4a626639ab43a5a24d884930e511826.tar.gz lwn-3c321bceb4a626639ab43a5a24d884930e511826.zip | |
[PATCH] x86-64: Add EFER to the register set 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@xmission.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/x86_64/kernel/suspend.c')
| -rw-r--r-- | arch/x86_64/kernel/suspend.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/suspend.c b/arch/x86_64/kernel/suspend.c index 91f7e678bae7..fe865ea4df52 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_context *ctxt) 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_context *ctxt) /* * 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 saved_context *ctxt) /* * 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)); |