diff options
Diffstat (limited to 'include/compile_time_macros.h')
| -rw-r--r-- | include/compile_time_macros.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/compile_time_macros.h b/include/compile_time_macros.h index cdf8b1998b..e5c1242f4c 100644 --- a/include/compile_time_macros.h +++ b/include/compile_time_macros.h @@ -41,4 +41,20 @@ #define BIT(nr) (1U << (nr)) #define BIT_ULL(nr) (1ULL << (nr)) +/* + * Create a bit mask from least significant bit |l| + * to bit |h|, inclusive. + * + * Examples: + * GENMASK(31, 0) ==> 0xFF_FF_FF_FF + * GENMASK(3, 0) ==> 0x00_00_00_0F + * GENMASK(7, 4) ==> 0x00_00_00_F0 + * GENMASK(b, b) ==> BIT(b) + * + * Note that we shift after using BIT() to avoid compiler + * warnings for BIT(31+1). + */ +#define GENMASK(h, l) (((BIT(h)<<1) - 1) ^ (BIT(l) - 1)) +#define GENMASK_ULL(h, l) (((BIT_ULL(h)<<1) - 1) ^ (BIT_ULL(l) - 1)) + #endif /* __CROS_EC_COMPILE_TIME_MACROS_H */ |