From 7df5350362a21cf74c1e87542a33345b100aeb6f Mon Sep 17 00:00:00 2001 From: Sebastian Hesselbarth Date: Sat, 26 Jul 2014 17:24:43 +0200 Subject: 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 Signed-off-by: Sascha Hauer --- include/common.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) 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; \ -- cgit v1.2.3