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    Subject[PATCH v6 06/12] x86/head_64.S: Define start_cpu0
    Date
    From: Fenghua Yu <fenghua.yu@intel.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@intel.com>
    ---
    arch/x86/kernel/head_64.S | 15 +++++++++++++++
    1 files changed, 15 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
    index 7a40f24..a91ce03 100644
    --- a/arch/x86/kernel/head_64.S
    +++ b/arch/x86/kernel/head_64.S
    @@ -256,6 +256,21 @@ 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
    +#endif
    +
    /* SMP bootup changes these two */
    __REFDATA
    .align 8
    --
    1.6.0.3


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