diff options
| author | Vivek Goyal <vgoyal@in.ibm.com> | 2007-05-02 13:27:07 -0400 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 13:27:07 -0400 |
| commit | 90b1c2085ea1955641e60a4f0acd63fdc271cd0b (patch) | |
| tree | 3e97e50667c58d31eb2619825358587c9b55b9e2 /arch/x86_64/kernel/head.S | |
| parent | 3c321bceb4a626639ab43a5a24d884930e511826 (diff) | |
[PATCH] x86-64: 64bit PIC SMP trampoline
This modifies the SMP trampoline and all of the associated code so
it can jump to a 64bit kernel loaded at an arbitrary address.
The dependencies on having an idenetity mapped page in the kernel
page tables for SMP bootup have all been removed.
In addition the trampoline has been modified to verify
that long mode is supported. Asking if long mode is implemented is
down right silly but we have traditionally had some of these checks,
and they can't hurt anything. So when the totally ludicrous happens
we just might handle it correctly.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/x86_64/kernel/head.S')
| -rw-r--r-- | arch/x86_64/kernel/head.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S index 2b2e2c51e532..562d62fbd69f 100644 --- a/arch/x86_64/kernel/head.S +++ b/arch/x86_64/kernel/head.S | |||
| @@ -101,6 +101,7 @@ startup_32: | |||
| 101 | .org 0x100 | 101 | .org 0x100 |
| 102 | .globl startup_64 | 102 | .globl startup_64 |
| 103 | startup_64: | 103 | startup_64: |
| 104 | ENTRY(secondary_startup_64) | ||
| 104 | /* We come here either from startup_32 | 105 | /* We come here either from startup_32 |
| 105 | * or directly from a 64bit bootloader. | 106 | * or directly from a 64bit bootloader. |
| 106 | * Since we may have come directly from a bootloader we | 107 | * Since we may have come directly from a bootloader we |