From 941db0e55ce85501bdb557bd72d8980c01b5ccd3 Mon Sep 17 00:00:00 2001 From: Yu-Ping Wu Date: Fri, 23 Jul 2021 16:17:11 +0800 Subject: 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 Reviewed-on: https://review.coreboot.org/c/coreboot/+/56543 Tested-by: build bot (Jenkins) Reviewed-by: Julius Werner --- src/commonlib/bsd/include/commonlib/bsd/helpers.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'src/commonlib') 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); \ -- cgit v1.2.3