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| author | Michael Brown | 2007-01-25 00:31:58 +0100 |
|---|---|---|
| committer | Michael Brown | 2007-01-25 00:31:58 +0100 |
| commit | 9cf5c4557d570fac79b1fe2c908a81e272fe1102 (patch) | |
| tree | 631eaabc2bc52209206e2c7569328377ef5c7be8 | |
| parent | Use base "0" in strtoul for consistency with "mem=" (diff) | |
| download | ipxe-9cf5c4557d570fac79b1fe2c908a81e272fe1102.tar.gz ipxe-9cf5c4557d570fac79b1fe2c908a81e272fe1102.tar.xz ipxe-9cf5c4557d570fac79b1fe2c908a81e272fe1102.zip | |
Add Linux-compatible rol32/ror32 functions. Amazingly, gcc will
optimise these down to the correct single "roll"/"rorl" instruction.
| -rw-r--r-- | src/include/gpxe/bitops.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/include/gpxe/bitops.h b/src/include/gpxe/bitops.h new file mode 100644 index 000000000..9e2fc7cbe --- /dev/null +++ b/src/include/gpxe/bitops.h @@ -0,0 +1,19 @@ +#ifndef _GPXE_BITOPS_H +#define _GPXE_BITOPS_H + +/** @file + * + * Bit operations + */ + +#include <stdint.h> + +static inline uint32_t rol32 ( uint32_t data, unsigned int rotation ) { + return ( ( data << rotation ) | ( data >> ( 32 - rotation ) ) ); +} + +static inline uint32_t ror32 ( uint32_t data, unsigned int rotation ) { + return ( ( data >> rotation ) | ( data << ( 32 - rotation ) ) ); +} + +#endif /* _GPXE_BITOPS_H */ |