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Add comments about why pre-allocate 32 bytes for load 64bit dxe core and Add code to make sure the stack is aligned to 16 bytes. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1935 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
lgao4 2006-11-13 07:10:54 +00:00
parent 15db5db9f1
commit 3e025b6993
1 changed files with 7 additions and 2 deletions
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9
EdkModulePkg/Core/DxeIplX64Peim/DxeLoadX64.c
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@ -259,8 +259,8 @@ Returns:
ASSERT (BaseOfStack != 0);
//
// Compute the top of the stack we were allocated. Pre-allocate a 32 bytes
// for x64 calling convention.
// Compute the top of the stack we were allocated, which is used to load X64 dxe core.
// Pre-allocate a 32 bytes which confroms to x64 calling convention.
//
// The first four parameters to a function are passed in rcx, rdx, r8 and r9.
// Any further parameters are pushed on the stack. Furthermore, space (4 * 8bytes) for the
@ -269,6 +269,11 @@ Returns:
//
TopOfStack = BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - 32;
//
// X64 Calling Conventions requires that the stack must be aligned to 16 bytes
//
TopOfStack = ALIGN_POINTER (TopOfStack, 16);
//
// Add architecture-specifc HOBs (including the BspStore HOB)
//