Implemented PPC optimized byte order functions, and added them to the build.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4665 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/libroot/os/arch/ppc/Jamfile

@@ -2,6 +2,7 @@ SubDir OBOS_TOP src kernel libroot os arch ppc ;
 
 KernelMergeObject os_arch_$(OBOS_ARCH).o :
 	<$(SOURCE_GRIST)>atomic.S
+	<$(SOURCE_GRIST)>byteorder.S
 #	<$(SOURCE_GRIST)>systeminfo.c
 	<$(SOURCE_GRIST)>system_time.S
 	<$(SOURCE_GRIST)>tls.c
@@ -11,5 +12,6 @@ KernelMergeObject os_arch_$(OBOS_ARCH).o :
 
 MergeObjectFromObjects kernel_os_arch_$(OBOS_ARCH).o :
 	<$(SOURCE_GRIST)>atomic.o
+	<$(SOURCE_GRIST)>byteorder.o
 	<$(SOURCE_GRIST)>system_time.o
 	;

src/kernel/libroot/os/arch/ppc/byteorder.S

@@ -0,0 +1,43 @@
+/*
+** Copyright 2003, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the OpenBeOS License.
+*/
+
+#define FUNCTION(x) .global x; .type x,@function; x
+
+.text
+
+/* uint16 __swap_int16(uint16 value)
+ *                     r3
+ */
+FUNCTION(__swap_int16):
+		rlwinm	%r4, %r3, 8, 16, 23		// byte 4 -> byte 3 (clear other bits)
+		rlwimi	%r4, %r3, 24, 24, 31	// byte 3 -> byte 4 (copy into)
+		mr		%r3, %r4				// copy to result register
+		blr
+
+
+/* uint32 __swap_int32(uint32 value)
+ *                     r3
+ */
+FUNCTION(__swap_int32):
+		rlwinm	%r4, %r3, 24, 0, 31		// byte 4 to 1, byte 2 to 3
+		rlwimi	%r4, %r3, 8, 8, 15		// byte 3 to 2
+		rlwimi	%r4, %r3, 8, 24, 31		// byte 1 to 4
+		mr		%r3, %r4
+		blr
+
+
+/* uint64 __swap_int64(uint64 value)
+ *                     r3/r4
+ */
+FUNCTION(__swap_int64):
+		rlwinm	%r5, %r3, 24, 0, 31		// byte 4 to 5, byte 2 to 7
+		rlwimi	%r5, %r3, 8, 8, 15		// byte 3 to 6
+		rlwimi	%r5, %r3, 8, 24, 31		// byte 1 to 8
+		rlwinm	%r3, %r4, 24, 0, 31		// byte 8 to 1, byte 6 to 3
+		rlwimi	%r3, %r4, 8, 8, 15		// byte 7 to 2
+		rlwimi	%r3, %r4, 8, 24, 31		// byte 5 to 4
+		mr		%r4, %r5				// copy lower 32 bits
+		blr
+