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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2006-12-07 04:14:02 +0300 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-12-07 04:14:02 +0300 |
| commit | 62111195800d80c66cdc69063ea3145878c99fbf (patch) | |
| tree | 35bc9792b3ac232e70e106ff2f4c0193c3bb72ff /include/asm-i386/processor.h | |
| parent | 9ca36101a8d74704d78f10910f89d62de96f9dc8 (diff) | |
| download | linux-62111195800d80c66cdc69063ea3145878c99fbf.tar.xz | |
[PATCH] i386: Initialize the per-CPU data area
When a CPU is brought up, a PDA and GDT are allocated for it. The GDT's
__KERNEL_PDA entry is pointed to the allocated PDA memory, so that all
references using this segment descriptor will refer to the PDA.
This patch rearranges CPU initialization a bit, so that the GDT/PDA are set up
as early as possible in cpu_init(). Also for secondary CPUs, GDT+PDA are
preallocated and initialized so all the secondary CPU needs to do is set up
the ldt and load %gs. This will be important once smp_processor_id() and
current use the PDA.
In all cases, the PDA is set up in head.S, before a CPU starts running C code,
so the PDA is always available.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Chuck Ebbert <76306.1226@compuserve.com>
Cc: Zachary Amsden <zach@vmware.com>
Cc: Jan Beulich <jbeulich@novell.com>
Cc: Andi Kleen <ak@suse.de>
Cc: James Bottomley <James.Bottomley@SteelEye.com>
Cc: Matt Tolentino <matthew.e.tolentino@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Diffstat (limited to 'include/asm-i386/processor.h')
| -rw-r--r-- | include/asm-i386/processor.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h index e0ddca94d50c..a9f2041c7c87 100644 --- a/include/asm-i386/processor.h +++ b/include/asm-i386/processor.h @@ -727,4 +727,7 @@ extern unsigned long boot_option_idle_override; extern void enable_sep_cpu(void); extern int sysenter_setup(void); +extern int init_gdt(int cpu, struct task_struct *idle); +extern void secondary_cpu_init(void); + #endif /* __ASM_I386_PROCESSOR_H */ |