diff options
Diffstat (limited to 'include/bitops.h')
-rw-r--r-- | include/bitops.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/include/bitops.h b/include/bitops.h new file mode 100644 index 0000000..81375d0 --- /dev/null +++ b/include/bitops.h @@ -0,0 +1,84 @@ +#ifndef BITOPS_H +#define BITOPS_H + +#include <stdint.h> + +/* + * Bit map related macros. Usually provided by libc. + */ +#include <sys/param.h> + +#ifndef NBBY +# define NBBY CHAR_BIT +#endif + +#ifndef setbit +# define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) +# define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) +# define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) +# define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) +#endif + +/* + * Byte swab macros (based on linux/byteorder/swab.h) + */ +#define swab16(x) \ + ((uint16_t)( \ + (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) | \ + (((uint16_t)(x) & (uint16_t)0xff00U) >> 8) )) + +#define swab32(x) \ + ((uint32_t)( \ + (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \ + (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \ + (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \ + (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24) )) + +#define swab64(x) \ + ((uint64_t)( \ + (uint64_t)(((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \ + (uint64_t)(((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \ + (uint64_t)(((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \ + (uint64_t)(((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \ + (uint64_t)(((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \ + (uint64_t)(((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \ + (uint64_t)(((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \ + (uint64_t)(((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56) )) + + +#ifdef WORDS_BIGENDIAN + +#define cpu_to_le16(x) swab16(x) +#define cpu_to_le32(x) swab32(x) +#define cpu_to_le64(x) swab64(x) +#define cpu_to_be16(x) ((uint16_t)(x)) +#define cpu_to_be32(x) ((uint32_t)(x)) +#define cpu_to_be64(x) ((uint64_t)(x)) + +#define le16_to_cpu(x) swab16(x) +#define le32_to_cpu(x) swab32(x) +#define le64_to_cpu(x) swab64(x) +#define be16_to_cpu(x) ((uint16_t)(x)) +#define be32_to_cpu(x) ((uint32_t)(x)) +#define be64_to_cpu(x) ((uint64_t)(x)) + +#else /* !WORDS_BIGENDIAN */ + +#define cpu_to_le16(x) ((uint16_t)(x)) +#define cpu_to_le32(x) ((uint32_t)(x)) +#define cpu_to_le64(x) ((uint64_t)(x)) +#define cpu_to_be16(x) swab16(x) +#define cpu_to_be32(x) swab32(x) +#define cpu_to_be64(x) swab64(x) + +#define le16_to_cpu(x) ((uint16_t)(x)) +#define le32_to_cpu(x) ((uint32_t)(x)) +#define le64_to_cpu(x) ((uint64_t)(x)) +#define be16_to_cpu(x) swab16(x) +#define be32_to_cpu(x) swab32(x) +#define be64_to_cpu(x) swab64(x) + +#endif /* WORDS_BIGENDIAN */ + +#endif /* BITOPS_H */ + |