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Diffstat (limited to 'arch/x86/kernel/head_32.S')
-rw-r--r--arch/x86/kernel/head_32.S18
1 files changed, 11 insertions, 7 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index fd39eaf83b8..37c3d4b17d8 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -18,6 +18,8 @@
#include <asm/asm-offsets.h>
#include <asm/setup.h>
#include <asm/processor-flags.h>
+#include <asm/msr-index.h>
+#include <asm/cpufeature.h>
#include <asm/percpu.h>
/* Physical address */
@@ -297,25 +299,27 @@ ENTRY(startup_32_smp)
orl %edx,%eax
movl %eax,%cr4
- btl $5, %eax # check if PAE is enabled
- jnc 6f
+ testb $X86_CR4_PAE, %al # check if PAE is enabled
+ jz 6f
/* Check if extended functions are implemented */
movl $0x80000000, %eax
cpuid
- cmpl $0x80000000, %eax
- jbe 6f
+ /* Value must be in the range 0x80000001 to 0x8000ffff */
+ subl $0x80000001, %eax
+ cmpl $(0x8000ffff-0x80000001), %eax
+ ja 6f
mov $0x80000001, %eax
cpuid
/* Execute Disable bit supported? */
- btl $20, %edx
+ btl $(X86_FEATURE_NX & 31), %edx
jnc 6f
/* Setup EFER (Extended Feature Enable Register) */
- movl $0xc0000080, %ecx
+ movl $MSR_EFER, %ecx
rdmsr
- btsl $11, %eax
+ btsl $_EFER_NX, %eax
/* Make changes effective */
wrmsr