1 files changed, 99 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/powerpc/shared/include/byteorder.h b/c/src/lib/libcpu/powerpc/shared/include/byteorder.h
new file mode 100644
index 0000000000..e5342967d9
--- /dev/null
+++ b/c/src/lib/libcpu/powerpc/shared/include/byteorder.h
@@ -0,0 +1,99 @@
+/*
+ * byteorder.h
+ *
+ *        This file contains inline implementation of function to
+ *          deal with endian conversion.
+ *
+ * It is a stripped down version of linux ppc file...
+ *
+ * Copyright (C) 1999  Eric Valette (valette@crf.canon.fr)
+ *                     Canon Centre Recherche France.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#ifndef _PPC_BYTEORDER_H
+#define _PPC_BYTEORDER_H
+
+/*
+ *  $Id$
+ */
+
+#ifdef __GNUC__
+
+extern __inline__ unsigned ld_le16(volatile unsigned short *addr)
+{
+	unsigned val;
+
+	__asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
+	return val;
+}
+
+extern __inline__ void st_le16(volatile unsigned short *addr, unsigned val)
+{
+	__asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
+}
+
+extern __inline__ unsigned ld_le32(volatile unsigned *addr)
+{
+	unsigned val;
+
+	__asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
+	return val;
+}
+
+extern __inline__ void st_le32(volatile unsigned *addr, unsigned val)
+{
+	__asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
+}
+
+/* alas, egcs sounds like it has a bug in this code that doesn't use the
+   inline asm correctly, and can cause file corruption. Until I hear that
+   it's fixed, I can live without the extra speed. I hope. */
+#if !(__GNUC__ >= 2 && __GNUC_MINOR__ >= 90)
+#if 0
+#  define __arch_swab16(x) ld_le16(&x)
+#  define __arch_swab32(x) ld_le32(&x)
+#else
+static __inline__ __const__ __unsigned short ___arch__swab16(__unsigned short value)
+{
+	__unsigned int tmp;
+
+	__asm__("rlwimi %0,%0,8,0xff0000"
+	    : "=r" (tmp)
+	    : "0" (value));
+	return (tmp&0x00ffff00)>>8;
+}
+
+static __inline__ __const__ __unsigned int ___arch__swab32(__unsigned int value)
+{
+	__unsigned int result;
+
+	__asm__("rotlwi %0,%1,24\n\t"
+	    "rlwimi %0,%1,8,0xff\n\t"
+	    "rlwimi %0,%1,8,0xff0000"
+	    : "=&r" (result)
+	    : "r" (value));
+	return result;
+}
+#define __arch__swab32(x) ___arch__swab32(x)
+#define __arch__swab16(x) ___arch__swab16(x)
+#endif /* 0 */
+
+#endif
+
+/* The same, but returns converted value from the location pointer by addr. */
+#define __arch__swab16p(addr) ld_le16(addr)
+#define __arch__swab32p(addr) ld_le32(addr)
+
+/* The same, but do the conversion in situ, ie. put the value back to addr. */
+#define __arch__swab16s(addr) st_le16(addr,*addr)
+#define __arch__swab32s(addr) st_le32(addr,*addr)
+
+#endif /* __GNUC__ */
+
+#endif /* _PPC_BYTEORDER_H */