Commit-ID: f1d01b229294734e52630c6ad6366aa29a257475
Gitweb: http://git.kernel.org/tip/f1d01b229294734e52630c6ad6366aa29a257475
Author: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
AuthorDate: Mon, 1 Oct 2012 14:34:42 -0700
Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
CommitDate: Mon, 1 Oct 2012 14:45:18 -0700
x86, suspend: Correct the restore of CR4, EFER; skip computing EFLAGS.ID
The patch:
73201dbe x86, suspend: On wakeup always initialize cr4 and EFER
... was incorrectly committed in an intermediate (unfinished) form.
- We need to test CF, not ZF, for a bit test with btl.
- We don't actually need to compute the existence of EFLAGS.ID,
since we set a flag at suspend time if CR4 should be restored.
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxx>
Link: http://lkml.kernel.org/r/1348529239-17943-1-git-send-email-hpa@xxxxxxxxxxxxxxx
---
arch/x86/realmode/rm/wakeup_asm.S | 15 +++------------
1 files changed, 3 insertions(+), 12 deletions(-)
diff --git a/arch/x86/realmode/rm/wakeup_asm.S b/arch/x86/realmode/rm/wakeup_asm.S
index e56479e..9e7e147 100644
--- a/arch/x86/realmode/rm/wakeup_asm.S
+++ b/arch/x86/realmode/rm/wakeup_asm.S
@@ -74,18 +74,9 @@ ENTRY(wakeup_start)
lidtl wakeup_idt
- /* Clear the EFLAGS but remember if we have EFLAGS.ID */
- movl $X86_EFLAGS_ID, %ecx
- pushl %ecx
- popfl
- pushfl
- popl %edi
+ /* Clear the EFLAGS */
pushl $0
popfl
- pushfl
- popl %edx
- xorl %edx, %edi
- andl %ecx, %edi /* %edi is zero iff CPUID & %cr4 are missing */
/* Check header signature... */
movl signature, %eax
@@ -120,12 +111,12 @@ ENTRY(wakeup_start)
movl %eax, %cr3
btl $WAKEUP_BEHAVIOR_RESTORE_CR4, %edi
- jz 1f
+ jnc 1f
movl pmode_cr4, %eax
movl %eax, %cr4
1:
btl $WAKEUP_BEHAVIOR_RESTORE_EFER, %edi
- jz 1f
+ jnc 1f
movl pmode_efer, %eax
movl pmode_efer + 4, %edx
movl $MSR_EFER, %ecx
--
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