kexec/i386: setup kexec page table in C

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>

1 files changed, 0 insertions, 114 deletions

diff --git a/arch/x86/kernel/relocate_kernel_32.S b/arch/x86/kernel/relocate_kernel_32.S
index 377da3f78e8c..a160f3119725 100644
--- a/arch/x86/kernel/relocate_kernel_32.S
+++ b/arch/x86/kernel/relocate_kernel_32.S
@@ -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 */