ati: hopefully fix byteswap mess for those other OSes.

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)