diff options
| -rw-r--r-- | configure.ac | 58 | ||||
| -rw-r--r-- | src/radeon_macros.h | 16 |
2 files changed, 74 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index beafb7e4..9ac46f73 100644 --- a/configure.ac +++ b/configure.ac @@ -244,6 +244,64 @@ if test "x$XSERVER_LIBPCIACCESS" = xyes; then fi AM_CONDITIONAL(XSERVER_LIBPCIACCESS, test "x$XSERVER_LIBPCIACCESS" = xyes) +# Checks for headers/macros for byte swapping +# Known variants: +# <byteswap.h> bswap_16, bswap_32, bswap_64 (glibc) +# <sys/endian.h> __swap16, __swap32, __swap64 (OpenBSD) +# <sys/endian.h> bswap16, bswap32, bswap64 (other BSD's) +# and a fallback to local macros if none of the above are found + +# if <byteswap.h> is found, assume it's the correct version +AC_CHECK_HEADERS([byteswap.h]) + +# if <sys/endian.h> is found, have to check which version +AC_CHECK_HEADER([sys/endian.h], [HAVE_SYS_ENDIAN_H="yes"], [HAVE_SYS_ENDIAN_H="no"]) + +if test "x$HAVE_SYS_ENDIAN_H" = "xyes" ; then + AC_MSG_CHECKING([for __swap16 variant of <sys/endian.h> byteswapping macros]) + AC_LINK_IFELSE([AC_LANG_PROGRAM([ +#include <sys/endian.h> + ], [ +int a = 1, b; +b = __swap16(a); + ]) +], [SYS_ENDIAN__SWAP='yes'], [SYS_ENDIAN__SWAP='no']) + AC_MSG_RESULT([$SYS_ENDIAN__SWAP]) + + AC_MSG_CHECKING([for bswap16 variant of <sys/endian.h> byteswapping macros]) + AC_LINK_IFELSE([AC_LANG_PROGRAM([ +#include <sys/endian.h> + ], [ +int a = 1, b; +b = bswap16(a); + ]) +], [SYS_ENDIAN_BSWAP='yes'], [SYS_ENDIAN_BSWAP='no']) + AC_MSG_RESULT([$SYS_ENDIAN_BSWAP]) + + if test "$SYS_ENDIAN_BSWAP" = "yes" ; then + USE_SYS_ENDIAN_H=yes + BSWAP=bswap + else + if test "$SYS_ENDIAN__SWAP" = "yes" ; then + USE_SYS_ENDIAN_H=yes + BSWAP=__swap + else + USE_SYS_ENDIAN_H=no + fi + fi + + if test "$USE_SYS_ENDIAN_H" = "yes" ; then + AC_DEFINE([USE_SYS_ENDIAN_H], 1, + [Define to use byteswap macros from <sys/endian.h>]) + AC_DEFINE_UNQUOTED([bswap_16], ${BSWAP}16, + [Define to 16-bit byteswap macro]) + AC_DEFINE_UNQUOTED([bswap_32], ${BSWAP}32, + [Define to 32-bit byteswap macro]) + AC_DEFINE_UNQUOTED([bswap_64], ${BSWAP}64, + [Define to 64-bit byteswap macro]) + fi +fi + case $host_os in *linux*) AC_DEFINE(FGL_LINUX, 1, [Use linux pragma pack]) ;; diff --git a/src/radeon_macros.h b/src/radeon_macros.h index 3675dc51..afe442ea 100644 --- a/src/radeon_macros.h +++ b/src/radeon_macros.h @@ -51,7 +51,23 @@ #include "compiler.h" +#if HAVE_BYTESWAP_H #include <byteswap.h> +#elif defined(USE_SYS_ENDIAN_H) +#include <sys/endian.h> +#else +#define bswap_16(value) \ + ((((value) & 0xff) << 8) | ((value) >> 8)) + +#define bswap_32(value) \ + (((uint32_t)bswap_16((uint16_t)((value) & 0xffff)) << 16) | \ + (uint32_t)bswap_16((uint16_t)((value) >> 16))) + +#define bswap_64(value) \ + (((uint64_t)bswap_32((uint32_t)((value) & 0xffffffff)) \ + << 32) | \ + (uint64_t)bswap_32((uint32_t)((value) >> 32))) +#endif #if X_BYTE_ORDER == X_BIG_ENDIAN #define le32_to_cpu(x) bswap_32(x) |