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x86: relocate_kernel - use predefined macroses for processor state

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Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
gorcunov@gmail.com 2008-03-23 00:00:08 +03:00 committed by Ingo Molnar
parent a7bba17bf0
commit fd3af53122
2 changed files with 20 additions and 29 deletions
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17
arch/x86/kernel/relocate_kernel_32.S
View file

@ -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
@ -167,16 +168,16 @@ identity_mapped:
pushl %edx
/* Set cr0 to a known state:
* 31 0 == Paging disabled
* 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 disabled
* - Alignment check disabled
* - Write protect disabled
* - No task switch
* - Don't do FP software emulation.
* - Proctected mode enabled
*/
movl %cr0, %eax
andl $~((1<<31)|(1<<18)|(1<<16)|(1<<3)|(1<<2)), %eax
orl $(1<<0), %eax
andl $~(X86_CR0_PG | X86_CR0_AM | X86_CR0_WP | X86_CR0_TS | X86_CR0_EM), %eax
orl $(X86_CR0_PE), %eax
movl %eax, %cr0
/* clear cr4 if applicable */

32
arch/x86/kernel/relocate_kernel_64.S
View file

@ -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