From: Jordan Justen <jordan.l.jus...@intel.com>
This sequence should happen:
* CpuMp.c: Allocate a stack for the APs
* ApStartup.c: Send Start IPI to wake APs in 16-bit real mode
* MpAsm.S: AP enters CpuDxe driver code without stack
- AP grabs a lock
- AP sets up stack
- AP calls CpuMp.c:ApEntryPointInC
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.jus...@intel.com>
---
UefiCpuPkg/CpuDxe/CpuMp.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/UefiCpuPkg/CpuDxe/CpuMp.c b/UefiCpuPkg/CpuDxe/CpuMp.c
index cb63b24..1d1ed3a 100644
--- a/UefiCpuPkg/CpuDxe/CpuMp.c
+++ b/UefiCpuPkg/CpuDxe/CpuMp.c
@@ -33,5 +33,16 @@ InitializeMpSupport (
VOID
)
{
+ mCommonStack = AllocatePages (EFI_SIZE_TO_PAGES (SIZE_64KB));
+ mTopOfApCommonStack = (VOID*) ((UINTN)mCommonStack + SIZE_64KB);
+ if (mCommonStack == NULL) {
+ return;
+ }
+
+ StartApsStackless (AsmApEntryPoint);
+
+ mTopOfApCommonStack = NULL;
+ FreePages (mCommonStack, EFI_SIZE_TO_PAGES (SIZE_64KB));
+ mCommonStack = NULL;
}
--
1.9.3
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