diff options
Diffstat (limited to 'libc/include/libc-internal.h')
| -rw-r--r-- | libc/include/libc-internal.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/libc/include/libc-internal.h b/libc/include/libc-internal.h index 0c0fa024a..78f82da58 100644 --- a/libc/include/libc-internal.h +++ b/libc/include/libc-internal.h @@ -50,4 +50,24 @@ extern void __init_misc (int, char **, char **); /* Cast an integer or a pointer VAL to integer with proper type. */ # define cast_to_integer(val) ((__integer_if_pointer_type (val)) (val)) +/* Align a value by rounding down to closest size. + e.g. Using size of 4096, we get this behavior: + {4095, 4096, 4097} = {0, 4096, 4096}. */ +#define ALIGN_DOWN(base, size) ((base) & -((__typeof__ (base)) (size))) + +/* Align a value by rounding up to closest size. + e.g. Using size of 4096, we get this behavior: + {4095, 4096, 4097} = {4096, 4096, 8192}. + + Note: The size argument has side effects (expanded multiple times). */ +#define ALIGN_UP(base, size) ALIGN_DOWN ((base) + (size) - 1, (size)) + +/* Same as ALIGN_DOWN(), but automatically casts when base is a pointer. */ +#define PTR_ALIGN_DOWN(base, size) \ + ((__typeof__ (base)) ALIGN_DOWN ((uintptr_t) (base), (size))) + +/* Same as ALIGN_UP(), but automatically casts when base is a pointer. */ +#define PTR_ALIGN_UP(base, size) \ + ((__typeof__ (base)) ALIGN_UP ((uintptr_t) (base), (size))) + #endif /* _LIBC_INTERNAL */ |