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kexec/i386: setup kexec page table in C

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Impact: change the kexec bootstrap code implementation from assembly to C

This patch transforms the kexec page tables setup code from assembler
code to C code in machine_kexec_prepare. This improves readability and
reduces code line number.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Huang Ying
2008-10-31 09:48:15 +08:00
committed by Ingo Molnar
parent 92be3d6bdf
commit 9868ee63b8
3 changed files with 49 additions and 141 deletions
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114
arch/x86/kernel/relocate_kernel_32.S
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@@ -10,15 +10,12 @@
#include <asm/page.h>
#include <asm/kexec.h>
#include <asm/processor-flags.h>
#include <asm/pgtable.h>
/*
* Must be relocatable PIC code callable as a C function
*/
#define PTR(x) (x << 2)
#define PAGE_ATTR (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
#define PAE_PGD_ATTR (_PAGE_PRESENT)
/* control_page + KEXEC_CONTROL_CODE_MAX_SIZE
* ~ control_page + PAGE_SIZE are used as data storage and stack for
@@ -59,117 +56,6 @@ relocate_kernel:
movl %cr4, %eax
movl %eax, CR4(%edi)
#ifdef CONFIG_X86_PAE
/* map the control page at its virtual address */
movl PTR(VA_PGD)(%ebp), %edi
movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
andl $0xc0000000, %eax
shrl $27, %eax
addl %edi, %eax
movl PTR(PA_PMD_0)(%ebp), %edx
orl $PAE_PGD_ATTR, %edx
movl %edx, (%eax)
movl PTR(VA_PMD_0)(%ebp), %edi
movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
andl $0x3fe00000, %eax
shrl $18, %eax
addl %edi, %eax
movl PTR(PA_PTE_0)(%ebp), %edx
orl $PAGE_ATTR, %edx
movl %edx, (%eax)
movl PTR(VA_PTE_0)(%ebp), %edi
movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
andl $0x001ff000, %eax
shrl $9, %eax
addl %edi, %eax
movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
orl $PAGE_ATTR, %edx
movl %edx, (%eax)
/* identity map the control page at its physical address */
movl PTR(VA_PGD)(%ebp), %edi
movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
andl $0xc0000000, %eax
shrl $27, %eax
addl %edi, %eax
movl PTR(PA_PMD_1)(%ebp), %edx
orl $PAE_PGD_ATTR, %edx
movl %edx, (%eax)
movl PTR(VA_PMD_1)(%ebp), %edi
movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
andl $0x3fe00000, %eax
shrl $18, %eax
addl %edi, %eax
movl PTR(PA_PTE_1)(%ebp), %edx
orl $PAGE_ATTR, %edx
movl %edx, (%eax)
movl PTR(VA_PTE_1)(%ebp), %edi
movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
andl $0x001ff000, %eax
shrl $9, %eax
addl %edi, %eax
movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
orl $PAGE_ATTR, %edx
movl %edx, (%eax)
#else
/* map the control page at its virtual address */
movl PTR(VA_PGD)(%ebp), %edi
movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
andl $0xffc00000, %eax
shrl $20, %eax
addl %edi, %eax
movl PTR(PA_PTE_0)(%ebp), %edx
orl $PAGE_ATTR, %edx
movl %edx, (%eax)
movl PTR(VA_PTE_0)(%ebp), %edi
movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
andl $0x003ff000, %eax
shrl $10, %eax
addl %edi, %eax
movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
orl $PAGE_ATTR, %edx
movl %edx, (%eax)
/* identity map the control page at its physical address */
movl PTR(VA_PGD)(%ebp), %edi
movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
andl $0xffc00000, %eax
shrl $20, %eax
addl %edi, %eax
movl PTR(PA_PTE_1)(%ebp), %edx
orl $PAGE_ATTR, %edx
movl %edx, (%eax)
movl PTR(VA_PTE_1)(%ebp), %edi
movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
andl $0x003ff000, %eax
shrl $10, %eax
addl %edi, %eax
movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
orl $PAGE_ATTR, %edx
movl %edx, (%eax)
#endif
relocate_new_kernel:
/* read the arguments and say goodbye to the stack */
movl 20+4(%esp), %ebx /* page_list */
movl 20+8(%esp), %ebp /* list of pages */