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| author | H. Peter Anvin <hpa@linux.intel.com> | 2011-02-15 00:34:57 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2011-02-18 06:02:43 +0100 |
| commit | 4822b7fc6d4870685a9feadfc348d48f5e47460a (patch) | |
| tree | 52a482fde76ff8bae64fc09761967a33b9b7b08b /arch/x86/kernel/head_64.S | |
| parent | Linux 2.6.38-rc5 (diff) | |
| download | linux-4822b7fc6d4870685a9feadfc348d48f5e47460a.tar.xz linux-4822b7fc6d4870685a9feadfc348d48f5e47460a.zip | |
x86, trampoline: Common infrastructure for low memory trampolines
Common infrastructure for low memory trampolines. This code installs
the trampolines permanently in low memory very early. It also permits
multiple pieces of code to be used for this purpose.
This code also introduces a standard infrastructure for computing
symbol addresses in the trampoline code.
The only change to the actual SMP trampolines themselves is that the
64-bit trampoline has been made reusable -- the previous version would
overwrite the code with a status variable; this moves the status
variable to a separate location.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
LKML-Reference: <4D5DFBE4.7090104@intel.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Matthieu Castet <castet.matthieu@free.fr>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Diffstat (limited to 'arch/x86/kernel/head_64.S')
| -rw-r--r-- | arch/x86/kernel/head_64.S | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index 239046bd447f..e11e39478a49 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -136,10 +136,9 @@ ident_complete: /* Fixup phys_base */ addq %rbp, phys_base(%rip) -#ifdef CONFIG_X86_TRAMPOLINE + /* Fixup trampoline */ addq %rbp, trampoline_level4_pgt + 0(%rip) addq %rbp, trampoline_level4_pgt + (511*8)(%rip) -#endif /* Due to ENTRY(), sometimes the empty space gets filled with * zeros. Better take a jmp than relying on empty space being |