x86: relocate_kernel - use predefined macroses for processor state

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 21 deletions

diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S
index c2c8b9d6e24..0c93a945b32 100644
--- a/arch/x86/kernel/relocate_kernel_64.S
+++ b/arch/x86/kernel/relocate_kernel_64.S
@@ -9,6 +9,7 @@
 #include <linux/linkage.h>
 #include <asm/page.h>
 #include <asm/kexec.h>
+#include <asm/processor-flags.h>
 
 /*
  * Must be relocatable PIC code callable as a C function
@@ -171,33 +172,22 @@ identity_mapped:
         pushq   %rdx
 
         /* Set cr0 to a known state:
-         * 31 1 == Paging enabled
-         * 18 0 == Alignment check disabled
-         * 16 0 == Write protect disabled
-         * 3  0 == No task switch
-         * 2  0 == Don't do FP software emulation.
-         * 0  1 == Proctected mode enabled
+         *  - Paging enabled
+         *  - Alignment check disabled
+         *  - Write protect disabled
+         *  - No task switch
+         *  - Don't do FP software emulation.
+         *  - Proctected mode enabled
          */
         movq    %cr0, %rax
-        andq    $~((1<<18)|(1<<16)|(1<<3)|(1<<2)), %rax
-        orl     $((1<<31)|(1<<0)), %eax
+        andq    $~(X86_CR0_AM | X86_CR0_WP | X86_CR0_TS | X86_CR0_EM), %rax
+        orl     $(X86_CR0_PG | X86_CR0_PE), %eax
         movq    %rax, %cr0
 
         /* Set cr4 to a known state:
-         * 10 0 == xmm exceptions disabled
-         * 9  0 == xmm registers instructions disabled
-         * 8  0 == performance monitoring counter disabled
-         * 7  0 == page global disabled
-         * 6  0 == machine check exceptions disabled
-         * 5  1 == physical address extension enabled
-         * 4  0 == page size extensions disabled
-         * 3  0 == Debug extensions disabled
-         * 2  0 == Time stamp disable (disabled)
-         * 1  0 == Protected mode virtual interrupts disabled
-         * 0  0 == VME disabled
+         *  - physical address extension enabled
          */
-
-        movq    $((1<<5)), %rax
+        movq    $X86_CR4_PAE, %rax
         movq    %rax, %cr4
 
         jmp 1f