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| author | Jordan Justen <jordan.l.justen@intel.com> | 2014-11-13 18:24:59 +0000 |
|---|---|---|
| committer | jljusten <jljusten@Edk2> | 2014-11-13 18:24:59 +0000 |
| commit | fab82c1873b792bce33fb22c32db71324fc0ac3b (patch) | |
| tree | bfda1f1c1e5e7b3f8353fd893828fa9e39dd5431 /MdePkg/Library/BaseLib/X86ReadGdtr.c | |
| parent | 1535c888c6f06bb35881e83cd7ee49fb8554942b (diff) | |
| download | edk2-platforms-fab82c1873b792bce33fb22c32db71324fc0ac3b.tar.xz | |
UefiCpuPkg/CpuDxe: Add stackless assembly AP entry points
The AP startup code simply jumps into this code with the CpuDxe driver
without setting up a stack for the processor.
Therefore, this code must setup the stack before calling into C code.
This is the basic flow:
* AP enters CpuDxe driver code (AsmApEntryPoint) without stack
- AP grabs a lock
- AP sets up stack
- AP calls CpuMp.c:ApEntryPointInC
- If ApEntryPointInC returns, the lock is freed, and another AP may
run
- The AP C code may call AsmApDoneWithCommonStack to indicate that
the AP is no longer using the stack, and another may therefore
proceed to use the stack and then call ApEntryPointInC
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16347 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseLib/X86ReadGdtr.c')
0 files changed, 0 insertions, 0 deletions