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Fix a bug that Pages*EFI_PAGES_SIZE might be a negative number. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7854 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
qhuang8 2009-03-10 14:34:42 +00:00
parent ff565d71e1
commit 6203199177
1 changed files with 5 additions and 5 deletions
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10
MdeModulePkg/Core/Pei/Memory/MemoryServices.c
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@ -128,6 +128,7 @@ PeiAllocatePages (
EFI_PEI_HOB_POINTERS Hob;
EFI_PHYSICAL_ADDRESS *FreeMemoryTop;
EFI_PHYSICAL_ADDRESS *FreeMemoryBottom;
UINTN RemainingPages;
PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS (PeiServices);
Hob.Raw = PrivateData->HobList.Raw;
@ -159,11 +160,10 @@ PeiAllocatePages (
//
// Verify that there is sufficient memory to satisfy the allocation
//
if (*(FreeMemoryTop) - ((Pages * EFI_PAGE_SIZE) + sizeof (EFI_HOB_MEMORY_ALLOCATION)) <
*(FreeMemoryBottom)) {
DEBUG ((EFI_D_ERROR, "AllocatePages failed: No 0x%x Pages is available.\n", Pages));
DEBUG ((EFI_D_ERROR, "There is only left 0x%x pages memory resource to be allocated.\n", \
EFI_SIZE_TO_PAGES ((UINTN) (*(FreeMemoryTop) - *(FreeMemoryBottom)))));
RemainingPages = EFI_SIZE_TO_PAGES ((UINTN) (*FreeMemoryTop - *FreeMemoryBottom));
if ((INTN) (RemainingPages - EFI_SIZE_TO_PAGES (sizeof (EFI_HOB_MEMORY_ALLOCATION))) < Pages) {
DEBUG ((EFI_D_ERROR, "AllocatePages failed: No 0x%lx Pages is available.\n", (UINT64) Pages));
DEBUG ((EFI_D_ERROR, "There is only left 0x%lx pages memory resource to be allocated.\n", (UINT64) RemainingPages));
return EFI_OUT_OF_RESOURCES;
} else {
//