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

1 files changed, 6 insertions, 0 deletions

diff --git a/UefiCpuPkg/CpuDxe/CpuDxe.inf b/UefiCpuPkg/CpuDxe/CpuDxe.inf
index e49548f40b..9952eb7007 100644
--- a/UefiCpuPkg/CpuDxe/CpuDxe.inf
+++ b/UefiCpuPkg/CpuDxe/CpuDxe.inf
@@ -53,11 +53,17 @@
   Ia32/CpuAsm.asm | MSFT

   Ia32/CpuAsm.asm | INTEL

   Ia32/CpuAsm.S   | GCC

+  Ia32/MpAsm.asm  | MSFT

+  Ia32/MpAsm.asm  | INTEL

+  Ia32/MpAsm.nasm | GCC

 

 [Sources.X64]

   X64/CpuAsm.asm | MSFT

   X64/CpuAsm.asm | INTEL

   X64/CpuAsm.S   | GCC

+  X64/MpAsm.asm  | MSFT

+  X64/MpAsm.asm  | INTEL

+  X64/MpAsm.nasm | GCC

 

 [Protocols]

   gEfiCpuArchProtocolGuid                       ## PRODUCES