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Date: Tue, 13 Nov 2012 11:32:44 -0800 From: "Fenghua Yu" <fenghua.yu@...el.com> To: "Ingo Molnar" <mingo@...e.hu>, "Thomas Gleixner" <tglx@...utronix.de>, "H Peter Anvin" <hpa@...or.com>, "Linus Torvalds" <torvalds@...ux-foundation.org>, "Andrew Morton" <akpm@...ux-foundation.org>, "Asit K Mallick" <asit.k.mallick@...el.com>, "Tony Luck" <tony.luck@...el.com>, "Arjan Dan De Ven" <arjan@...ux.intel.com>, "Suresh B Siddha" <suresh.b.siddha@...el.com>, "Len Brown" <len.brown@...el.com>, "Srivatssa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>, "Randy Dunlap" <rdunlap@...otime.net>, "Rafael J. Wysocki" <rjw@...k.pl>, "Chen Gong" <gong.chen@...ux.intel.com>, "linux-kernel" <linux-kernel@...r.kernel.org>, "linux-pm" <linux-pm@...r.kernel.org>, "x86" <x86@...nel.org> Cc: "Fenghua Yu" <fenghua.yu@...el.com> Subject: [PATCH v10 07/14] x86-64, hotplug: Add start_cpu0() entry point to head_64.S From: Fenghua Yu <fenghua.yu@...el.com> 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@...el.com> --- arch/x86/kernel/head_64.S | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index 94bf9cc..980053c 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -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 -- 1.7.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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