lkml.org 
[lkml]   [2012]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[tip:x86/bsp-hotplug] x86-64, hotplug: Add start_cpu0() entry point to head_64.S
    Commit-ID:  2e93a931a797f2a7fffceae189fd2b6256b785de
    Gitweb: http://git.kernel.org/tip/2e93a931a797f2a7fffceae189fd2b6256b785de
    Author: Fenghua Yu <fenghua.yu@intel.com>
    AuthorDate: Sat, 25 Aug 2012 10:41:22 -0700
    Committer: H. Peter Anvin <hpa@linux.intel.com>
    CommitDate: Sat, 25 Aug 2012 19:26:06 -0700

    x86-64, hotplug: Add start_cpu0() entry point to head_64.S

    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>
    Link: http://lkml.kernel.org/r/1345916488-8355-7-git-send-email-fenghua.yu@intel.com
    Signed-off-by: H. Peter Anvin <hpa@linux.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 94bf9cc..3faac8a 100644
    --- a/arch/x86/kernel/head_64.S
    +++ b/arch/x86/kernel/head_64.S
    @@ -252,6 +252,21 @@ 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

    \
     
     \ /
      Last update: 2012-08-27 20:01    [W:5.493 / U:0.348 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site