diff options
| author | Yu-Ping Wu <yupingso@chromium.org> | 2021-07-23 16:17:11 +0800 |
|---|---|---|
| committer | Paul Fagerburg <pfagerburg@chromium.org> | 2021-08-02 15:01:54 +0000 |
| commit | 941db0e55ce85501bdb557bd72d8980c01b5ccd3 (patch) | |
| tree | 22f917b4741576da9ed6553f6d19ebe4ec1ab09a /src/commonlib | |
| parent | 5d71994c02b2808078e142fc112b0f6615fa9c62 (diff) | |
helpers: Add GENMASK macro
The GENMASK is defined in multiple files (with various names such as
MASKBIT), which sets certain consecutive bits to 1 and leaves the others
to 0. To avoid duplicate macros, add GENMASK macro to helpers.h.
GENMASK(high, low) sets bits from `high` to `low` (inclusive) to 1. For
example, GENMASK(39, 21) gives us the 64-bit vector 0x000000ffffe00000.
Remove duplicate macro definitions. Also utilize GENMASK for _BF_MASK in
mmio.h.
BUG=none
TEST=make tests/commonlib/bsd/helpers-test
TEST=emerge-cherry coreboot
BRANCH=none
Change-Id: If2e7c4827d8a7d27688534593b556a72f16f0c2b
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56543
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Diffstat (limited to 'src/commonlib')
| -rw-r--r-- | src/commonlib/bsd/include/commonlib/bsd/helpers.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/commonlib/bsd/include/commonlib/bsd/helpers.h b/src/commonlib/bsd/include/commonlib/bsd/helpers.h index 376ebaef11..733b05a8f1 100644 --- a/src/commonlib/bsd/include/commonlib/bsd/helpers.h +++ b/src/commonlib/bsd/include/commonlib/bsd/helpers.h @@ -54,6 +54,9 @@ #define POWER_OF_2(x) (1ULL << (x)) +/* Set bits from `high` to `low` (inclusive). */ +#define GENMASK(high, low) (((~0ULL) << (low)) & (~0ULL >> (63 - (high)))) + #define DIV_ROUND_UP(x, y) ({ \ __typeof__(x) _div_local_x = (x); \ __typeof__(y) _div_local_y = (y); \ |