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author | Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> | 2014-07-26 17:24:43 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2014-07-28 07:31:18 +0200 |
commit | 7df5350362a21cf74c1e87542a33345b100aeb6f (patch) | |
tree | f8d90a431c6d88afb13a7b21aaf8af02bb9f09e4 /include/common.h | |
parent | 343ccff163789949f2c683dcea819ceb68dbcf02 (diff) | |
download | barebox-7df5350362a21cf74c1e87542a33345b100aeb6f.tar.gz barebox-7df5350362a21cf74c1e87542a33345b100aeb6f.tar.xz |
include: import {lower,upper}_32_bits helpers
This imports {lower,upper}_32_bits defines to allow to get upper
and lower 32b part of a 64b number.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include/common.h')
-rw-r--r-- | include/common.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/common.h b/include/common.h index e7ab5feeac..9919fa4f5d 100644 --- a/include/common.h +++ b/include/common.h @@ -281,6 +281,22 @@ void barebox_set_hostname(const char *); } \ ) +/** + * upper_32_bits - return bits 32-63 of a number + * @n: the number we're accessing + * + * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress + * the "right shift count >= width of type" warning when that quantity is + * 32-bits. + */ +#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) + +/** + * lower_32_bits - return bits 0-31 of a number + * @n: the number we're accessing + */ +#define lower_32_bits(n) ((u32)(n)) + #define abs(x) ({ \ long __x = (x); \ (__x < 0) ? -__x : __x; \ |