1 files changed, 168 insertions, 0 deletions

diff --git a/firmware/include/rbendian.h b/firmware/include/rbendian.h
new file mode 100644
index 0000000000..21d3cae68d
--- /dev/null
+++ b/firmware/include/rbendian.h
@@ -0,0 +1,168 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Alan Korr
+ *
+ * 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.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef _RBENDIAN_H_
+#define _RBENDIAN_H_
+
+#include "config.h"
+#include <endian.h>
+
+/* clear these out since we redefine them to be truely constant compatible */
+#undef swap16
+#undef swap32
+#undef swap64
+
+#undef letoh16
+#undef letoh32
+#undef letoh64
+#undef htole16
+#undef htole32
+#undef htole64
+#undef betoh16
+#undef betoh32
+#undef betoh64
+#undef htobe16
+#undef htobe32
+#undef htobe64
+
+#ifndef __ENDIAN_H_NATIVE_RB
+
+#if defined (__bswap_16)
+  #define __swap16_os(x)    __bswap_16(x)
+  #define __swap32_os(x)    __bswap_32(x)
+  #define __swap64_os(x)    __bswap_64(x)
+#elif defined (__swap16)
+  #define __swap16_os(x)    __swap16(x)
+  #define __swap32_os(x)    __swap32(x)
+  #define __swap64_os(x)    __swap64(x)
+#else
+  #error "Missing OS swap defines."
+#endif
+
+/* wrap these because they aren't compatible with compound initializers */
+static FORCE_INLINE uint16_t swap16_hw(uint16_t x)
+  { return __swap16_os(x); }
+static FORCE_INLINE uint32_t swap32_hw(uint32_t x)
+  { return __swap32_os(x); }
+static FORCE_INLINE uint64_t swap64_hw(uint64_t x)
+  { return __swap64_os(x); }
+
+#endif /* __ENDIAN_H_NATIVE_RB */
+
+#if defined(NEED_GENERIC_BYTESWAPS) || !defined(__ENDIAN_H_NATIVE_RB)
+/* these are uniquely ours it seems */
+static inline uint32_t swap_odd_even32_hw(uint32_t value)
+    /*
+     * result[31..24],[15.. 8] = value[23..16],[ 7.. 0]
+     * result[23..16],[ 7.. 0] = value[31..24],[15.. 8]
+     */
+{
+    uint32_t t = value & 0xff00ff00;
+    return (t >> 8) | ((t ^ value) << 8);
+}
+
+static inline uint32_t swaw32_hw(uint32_t value)
+    /*
+     * result[31..16] = value[15.. 0];
+     * result[15.. 0] = value[31..16];
+     */
+{
+    return (value >> 16) | (value << 16);
+}
+#endif /* Generic */
+
+/* static endianness conversion */
+#define SWAP16_CONST(x) \
+    ((typeof(x))( ((uint16_t)(x) >> 8) | ((uint16_t)(x) << 8) ))
+
+#define SWAP32_CONST(x) \
+    ((typeof(x))( (((uint32_t)(x) & 0xff000000) >> 24) | \
+                  (((uint32_t)(x) & 0x00ff0000) >>  8) | \
+                  (((uint32_t)(x) & 0x0000ff00) <<  8) | \
+                  (((uint32_t)(x) & 0x000000ff) << 24) ))
+
+#define SWAP64_CONST(x) \
+    ((typeof(x))( (((uint64_t)(x) & 0xff00000000000000ull) >> 56) | \
+                  (((uint64_t)(x) & 0x00ff000000000000ull) >> 40) | \
+                  (((uint64_t)(x) & 0x0000ff0000000000ull) >> 24) | \
+                  (((uint64_t)(x) & 0x000000ff00000000ull) >>  8) | \
+                  (((uint64_t)(x) & 0x00000000ff000000ull) <<  8) | \
+                  (((uint64_t)(x) & 0x0000000000ff0000ull) << 24) | \
+                  (((uint64_t)(x) & 0x000000000000ff00ull) << 40) | \
+                  (((uint64_t)(x) & 0x00000000000000ffull) << 56) ))
+
+#define SWAP_ODD_EVEN32_CONST(x) \
+    ((typeof(x))( ((uint32_t)SWAP16_CONST((uint32_t)(x) >> 16) << 16) | \
+                             SWAP16_CONST((uint32_t)(x))) )
+
+#define SWAW32_CONST(x) \
+    ((typeof(x))( ((uint32_t)(x) << 16) | ((uint32_t)(x) >> 16) ))
+
+/* select best method based upon whether x is a constant expression */
+#define swap16(x) \
+    ( __builtin_constant_p(x) ? SWAP16_CONST(x) : (typeof(x))swap16_hw(x) )
+
+#define swap32(x) \
+    ( __builtin_constant_p(x) ? SWAP32_CONST(x) : (typeof(x))swap32_hw(x) )
+
+#define swap64(x) \
+    ( __builtin_constant_p(x) ? SWAP64_CONST(x) : (typeof(x))swap64_hw(x) )
+
+#define swap_odd_even32(x) \
+    ( __builtin_constant_p(x) ? SWAP_ODD_EVEN32_CONST(x) : (typeof(x))swap_odd_even32_hw(x) )
+
+#define swaw32(x) \
+    ( __builtin_constant_p(x) ? SWAW32_CONST(x) : (typeof(x))swaw32_hw(x) )
+
+#if defined(ROCKBOX_LITTLE_ENDIAN)
+  #define letoh16(x) (x)
+  #define letoh32(x) (x)
+  #define letoh64(x) (x)
+  #define htole16(x) (x)
+  #define htole32(x) (x)
+  #define htole64(x) (x)
+  #define betoh16(x) swap16(x)
+  #define betoh32(x) swap32(x)
+  #define betoh64(x) swap64(x)
+  #define htobe16(x) swap16(x)
+  #define htobe32(x) swap32(x)
+  #define htobe64(x) swap64(x)
+  #define swap_odd_even_be32(x) (x)
+  #define swap_odd_even_le32(x) swap_odd_even32(x)
+#elif defined(ROCKBOX_BIG_ENDIAN)
+  #define letoh16(x) swap16(x)
+  #define letoh32(x) swap32(x)
+  #define letoh64(x) swap64(x)
+  #define htole16(x) swap16(x)
+  #define htole32(x) swap32(x)
+  #define htole64(x) swap64(x)
+  #define betoh16(x) (x)
+  #define betoh32(x) (x)
+  #define betoh64(x) (x)
+  #define htobe16(x) (x)
+  #define htobe32(x) (x)
+  #define htobe64(x) (x)
+  #define swap_odd_even_be32(x) swap_odd_even32(x)
+  #define swap_odd_even_le32(x) (x)
+#else
+  #error "Unknown endianness!"
+#endif
+
+#endif /* _RBENDIAN_H_ */