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x86-64, hotplug: Add start_cpu0() entry point to head_64.S

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start_cpu0() is defined in head_64.S for 64-bit. The function sets up stack and
jumps to start_secondary() for CPU0 wake up.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1352835171-3958-8-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Fenghua Yu 2012-11-13 11:32:44 -08:00 committed by H. Peter Anvin
parent 6e32d479db
commit 42e78e9719
1 changed files with 16 additions and 0 deletions
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16
arch/x86/kernel/head_64.S
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@ -252,6 +252,22 @@ ENTRY(secondary_startup_64)
pushq %rax # target address in negative space pushq %rax # target address in negative space
lretq lretq
#ifdef CONFIG_HOTPLUG_CPU
/*
* Boot CPU0 entry point. It's called from play_dead(). Everything has been set
* up already except stack. We just set up stack here. Then call
* start_secondary().
*/
ENTRY(start_cpu0)
movq stack_start(%rip),%rsp
movq initial_code(%rip),%rax
pushq $0 # fake return address to stop unwinder
pushq $__KERNEL_CS # set correct cs
pushq %rax # target address in negative space
lretq
ENDPROC(start_cpu0)
#endif
/* SMP bootup changes these two */ /* SMP bootup changes these two */
__REFDATA __REFDATA
.align 8 .align 8