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Add comment about usage on EFI_SIZE_TO_PAGES() and EFI_PAGES_TO_SIZE macros. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11004 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
rsun3 2010-11-05 03:08:17 +00:00
parent c5e0de8794
commit 740ee2ea40
1 changed files with 5 additions and 1 deletions
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6
MdePkg/Include/Uefi/UefiBaseType.h
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@ -188,8 +188,12 @@ typedef union {
#define EFI_PAGE_MASK 0xFFF
#define EFI_PAGE_SHIFT 12
//
// It is expected that a parameter for the following two macros is of type UINTN.
// Be careful to pass a UINT64 parameter because 32-bit build break may happen
// if << or >> shift operations are performed on a 64-bit integer with 32-bit C compiler.
//
#define EFI_SIZE_TO_PAGES(a) (((a) >> EFI_PAGE_SHIFT) + (((a) & EFI_PAGE_MASK) ? 1 : 0))
#define EFI_PAGES_TO_SIZE(a) ( (a) << EFI_PAGE_SHIFT)
///