diff options
| -rw-r--r-- | MdePkg/Include/Uefi/UefiBaseType.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/MdePkg/Include/Uefi/UefiBaseType.h b/MdePkg/Include/Uefi/UefiBaseType.h index 6e522807da..5b8a762072 100644 --- a/MdePkg/Include/Uefi/UefiBaseType.h +++ b/MdePkg/Include/Uefi/UefiBaseType.h @@ -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)
///
|