diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2009-12-13 11:36:40 +0100 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2009-12-19 08:26:20 -0600 |
| commit | 00e8277b8323797e6b10325d7d0a297c0fab22f5 (patch) | |
| tree | df7f16fb8fd85648bcf1b053a79e5e75be3cf108 /pc-bios | |
| parent | a8ea3a357b4f6d53e1f93f23d1368c574084a6f2 (diff) | |
Fix thinko in linuxboot.S
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 <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit 36ecd7c016f682437941a54193251cbf918bef0d)
Diffstat (limited to 'pc-bios')
| -rw-r--r-- | 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 7f3b1b2694..c4c9109b67 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 |