diff options
Diffstat (limited to 'xorg-server/include/misc.h')
| -rw-r--r-- | xorg-server/include/misc.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/xorg-server/include/misc.h b/xorg-server/include/misc.h index 664e02cae..19e71035c 100644 --- a/xorg-server/include/misc.h +++ b/xorg-server/include/misc.h @@ -315,6 +315,35 @@ __builtin_constant_p(int x) } #endif +/* byte swap a 64-bit value */ +static inline void +swap_uint64(uint64_t *x) +{ + char n; + + n = ((char *) x)[0]; + ((char *) x)[0] = ((char *) x)[7]; + ((char *) x)[7] = n; + + n = ((char *) x)[1]; + ((char *) x)[1] = ((char *) x)[6]; + ((char *) x)[6] = n; + + n = ((char *) x)[2]; + ((char *) x)[2] = ((char *) x)[5]; + ((char *) x)[5] = n; + + n = ((char *) x)[3]; + ((char *) x)[3] = ((char *) x)[4]; + ((char *) x)[4] = n; +} + +#define swapll(x) do { \ + if (sizeof(*(x)) != 8) \ + wrong_size(); \ + swap_uint64((uint64_t *)(x)); \ + } while (0) + /* byte swap a 32-bit value */ static inline void swap_uint32(uint32_t * x) |