From: Fenghua Yu Date: Tue, 13 Nov 2012 19:32:45 +0000 (-0800) Subject: x86-32, hotplug: Add start_cpu0() entry point to head_32.S X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3e2a0cc3cdc19e0518ae87583add40ea1bf55b67;p=linux-beck.git 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: Fenghua Yu Link: http://lkml.kernel.org/r/1352835171-3958-9-git-send-email-fenghua.yu@intel.com Signed-off-by: H. Peter Anvin --- diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S index 957a47aec64e..a013e7390ab5 100644 --- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -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