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Commit 42e78e97 authored by Fenghua Yu's avatar Fenghua Yu Committed by H. Peter Anvin
Browse files

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



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: default avatarFenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1352835171-3958-8-git-send-email-fenghua.yu@intel.com


Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 6e32d479

arch/x86/kernel/head_64.S

+16 −0
Original line number Diff line number Diff line
@@ -252,6 +252,22 @@ ENTRY(secondary_startup_64) 
	pushq	%rax		# target address in negative space

	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 */

	__REFDATA

	.align	8