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| author | Michael Brown | 2006-06-06 17:30:28 +0200 |
|---|---|---|
| committer | Michael Brown | 2006-06-06 17:30:28 +0200 |
| commit | e7eca7b7cbd3354916145c36ca88e9e754ef8812 (patch) | |
| tree | ccb17d4271862fb936983634df73cdebee592be8 /src/arch | |
| parent | Calculate _rom_size for the ROM prefix (diff) | |
| download | ipxe-e7eca7b7cbd3354916145c36ca88e9e754ef8812.tar.gz ipxe-e7eca7b7cbd3354916145c36ca88e9e754ef8812.tar.xz ipxe-e7eca7b7cbd3354916145c36ca88e9e754ef8812.zip | |
Code segment may not be writable; create the temporary pointer to the GDT
on the stack.
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/i386/prefix/libprefix.S | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/arch/i386/prefix/libprefix.S b/src/arch/i386/prefix/libprefix.S index 10227818c..f0f7682b5 100644 --- a/src/arch/i386/prefix/libprefix.S +++ b/src/arch/i386/prefix/libprefix.S @@ -254,6 +254,7 @@ flatten_real_mode: /* Preserve real-mode segment values and temporary registers */ pushw %es pushw %ds + pushw %bp pushl %eax /* Set GDT base and load GDT */ @@ -261,8 +262,11 @@ flatten_real_mode: movw %cs, %ax shll $4, %eax addl $gdt, %eax - movl %eax, %cs:gdt_base - lgdt %cs:gdt + pushl %eax + pushw %cs:gdt_limit + movw %sp, %bp + lgdt (%bp) + addw $6, %sp /* Switch to protected mode */ movl %cr0, %eax @@ -281,6 +285,7 @@ flatten_real_mode: /* Restore real-mode segment values and temporary registers */ popl %eax + popw %bp popw %ds popw %es ret |