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[Qemu-devel] [FOR 0.12 PATCH] Fix thinko in linuxboot.S
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [FOR 0.12 PATCH] Fix thinko in linuxboot.S |
Date: |
Sun, 13 Dec 2009 11:36:40 +0100 |
The %gs segment that was used was not matching the comments.
I just moved the GDT descriptor on the stack instead.
Signed-off-by: Paolo Bonzini <address@hidden>
---
pc-bios/optionrom/linuxboot.S | 20 ++++++++------------
1 files changed, 8 insertions(+), 12 deletions(-)
diff --git a/pc-bios/optionrom/linuxboot.S b/pc-bios/optionrom/linuxboot.S
index 7f3b1b2..c4c9109 100644
--- a/pc-bios/optionrom/linuxboot.S
+++ b/pc-bios/optionrom/linuxboot.S
@@ -79,24 +79,20 @@ copy_kernel:
mode, so let's get into 32 bit mode, write the kernel and jump
back again. */
- /* Set DS to SS+SP - 0x10, so we can write our GDT descriptor there */
- mov %ss, %eax
- shl $4, %eax
- add %esp, %eax
- sub $0x10, %eax
- shr $4, %eax
+ /* Reserve space on the stack for our GDT descriptor. */
+ mov %esp, %ebp
+ sub $16, %esp
/* Now create the GDT descriptor */
+ movw $((3 * 8) - 1), -16(%bp)
mov %cs, %eax
shl $4, %eax
- movw $((3 * 8) - 1), %bx
- movw %bx, %gs:0
- movl $gdt, %ebx
- add %eax, %ebx
- movl %ebx, %gs:2
+ addl $gdt, %ebx
+ movl %ebx, -14(%bp)
/* And load the GDT */
- data32 lgdt %gs:0
+ data32 lgdt -16(%bp)
+ mov %ebp, %esp
/* Get us to protected mode now */
mov $1, %eax
--
1.6.5.2
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