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Commit 3e2a0cc3 authored by Fenghua Yu's avatar Fenghua Yu Committed by H. Peter Anvin
Browse files

x86-32, hotplug: Add start_cpu0() entry point to head_32.S 



start_cpu0() is defined in head_32.S for 32-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/1352835171-3958-9-git-send-email-fenghua.yu@intel.com


Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 42e78e97

arch/x86/kernel/head_32.S

+13 −0
Original line number Diff line number Diff line
@@ -266,6 +266,19 @@ num_subarch_entries = (. - subarch_entries) / 4 
	jmp default_entry

#endif /* CONFIG_PARAVIRT */



#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)

	movl stack_start, %ecx

	movl %ecx, %esp

	jmp  *(initial_code)

ENDPROC(start_cpu0)

#endif



/*

 * Non-boot CPU entry point; entered from trampoline.S

 * We can't lgdt here, because lgdt itself uses a data segment, but