[PATCH] powerpc: merge byteorder.h

powerpc: Merge byteorder.h

Essentially adopts the 64-bit version of this file.  The 32-bit version had
been using unsigned ints for arguments/return values that were actually
only 16 bits - the new file uses __u16 for these items as in the 64-bit
version of the header.  The order of some of the asm constraints
in the 64-bit version was slightly different than the 32-bit version,
but they produce identical code.

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 89 insertions, 0 deletions

diff --git a/include/asm-powerpc/byteorder.h b/include/asm-powerpc/byteorder.h
new file mode 100644
index 000000000000..b37752214a16
--- /dev/null
+++ b/include/asm-powerpc/byteorder.h
@@ -0,0 +1,89 @@
+#ifndef _ASM_POWERPC_BYTEORDER_H
+#define _ASM_POWERPC_BYTEORDER_H
+
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <asm/types.h>
+#include <linux/compiler.h>
+
+#ifdef __GNUC__
+#ifdef __KERNEL__
+
+static __inline__ __u16 ld_le16(const volatile __u16 *addr)
+{
+        __u16 val;
+
+        __asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
+        return val;
+}
+
+static __inline__ void st_le16(volatile __u16 *addr, const __u16 val)
+{
+        __asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
+}
+
+static __inline__ __u32 ld_le32(const volatile __u32 *addr)
+{
+        __u32 val;
+
+        __asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
+        return val;
+}
+
+static __inline__ void st_le32(volatile __u32 *addr, const __u32 val)
+{
+        __asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
+}
+
+static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 value)
+{
+        __u16 result;
+
+        __asm__("rlwimi %0,%1,8,16,23"
+            : "=r" (result)
+            : "r" (value), "0" (value >> 8));
+        return result;
+}
+
+static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 value)
+{
+        __u32 result;
+
+        __asm__("rlwimi %0,%1,24,16,23\n\t"
+            "rlwimi %0,%1,8,8,15\n\t"
+            "rlwimi %0,%1,24,0,7"
+            : "=r" (result)
+            : "r" (value), "0" (value >> 24));
+        return result;
+}
+
+#define __arch__swab16(x) ___arch__swab16(x)
+#define __arch__swab32(x) ___arch__swab32(x)
+
+/* 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 /* __KERNEL__ */
+
+#ifndef __STRICT_ANSI__
+#define __BYTEORDER_HAS_U64__
+#ifndef __powerpc64__
+#define __SWAB_64_THRU_32__
+#endif /* __powerpc64__ */
+#endif /* __STRICT_ANSI__ */
+
+#endif /* __GNUC__ */
+
+#include <linux/byteorder/big_endian.h>
+
+#endif /* _ASM_POWERPC_BYTEORDER_H */