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

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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: Fenghua Yu <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>
This commit is contained in:
Fenghua Yu authored and H. Peter Anvin committed 2012-11-14 09:39:52 -08:00
1 parent 42e78e9719
commit 3e2a0cc3cd
1 file changed
+13
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arch/x86/kernel/head_32.S
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@@ -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