minios: Add endian, byteswap, and wordsize macros to mini-os

This patch addes byte swapping macros and endian support to mini-os.

Signed-off-by: Matthew Fioravante <matthew.fioravante@jhuapl.edu>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyons.org>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

extras/mini-os/include/byteorder.h

@@ -0,0 +1,36 @@
+#ifndef MINIOS_BYTEORDER_H
+#define MINIOS_BYTEORDER_H
+
+#include <mini-os/byteswap.h>
+#include <mini-os/endian.h>
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define be16_to_cpu(v) bswap_16(v)
+#define be32_to_cpu(v) bswap_32(v)
+#define be64_to_cpu(v) bswap_64(v)
+
+#define le16_to_cpu(v) (v)
+#define le32_to_cpu(v) (v)
+#define le64_to_cpu(v) (v)
+
+#else /*__BIG_ENDIAN*/
+#define be16_to_cpu(v) (v)
+#define be32_to_cpu(v) (v)
+#define be64_to_cpu(v) (v)
+
+#define le16_to_cpu(v) bswap_16(v)
+#define le32_to_cpu(v) bswap_32(v)
+#define le64_to_cpu(v) bswap_64(v)
+
+#endif
+
+#define cpu_to_be16(v) be16_to_cpu(v)
+#define cpu_to_be32(v) be32_to_cpu(v)
+#define cpu_to_be64(v) be64_to_cpu(v)
+
+#define cpu_to_le16(v) le16_to_cpu(v)
+#define cpu_to_le32(v) le32_to_cpu(v)
+#define cpu_to_le64(v) le64_to_cpu(v)
+
+
+#endif

extras/mini-os/include/byteswap.h

@@ -4,30 +4,36 @@
 /* Unfortunately not provided by newlib.  */
 
 #include <mini-os/types.h>
-static inline uint16_t bswap_16(uint16_t x)
-{
-    return
-    ((((x) & 0xff00) >> 8) | (((x) & 0xff) << 8));
-}
 
-static inline uint32_t bswap_32(uint32_t x)
-{
-    return
-    ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) |
-     (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24));
-}
+#define bswap_16(x) ((uint16_t)(                         \
+	         (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) |                  \
+	         (((uint16_t)(x) & (uint16_t)0xff00U) >> 8)))
+
+/* Use gcc optimized versions if they exist */
+#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
+#define bswap_32(v) __builtin_bswap32(v)
+#define bswap_64(v) __builtin_bswap64(v)
+#else
+
+#define bswap_32(x) ((uint32_t)(                         \
+	         (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) |            \
+	         (((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) |            \
+	         (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >>  8) |            \
+	         (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
+
+#define bswap_64(x) ((uint64_t)(                         \
+	         (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) |   \
+	         (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) |   \
+	         (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) |   \
+	         (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) <<  8) |   \
+	         (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >>  8) |   \
+	         (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) |   \
+	         (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) |   \
+	         (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56)))
+
+#endif
+
+
 
-static inline uint64_t bswap_64(uint64_t x)
-{
-    return
-    ((((x) & 0xff00000000000000ULL) >> 56) |
-     (((x) & 0x00ff000000000000ULL) >> 40) |
-     (((x) & 0x0000ff0000000000ULL) >> 24) |
-     (((x) & 0x000000ff00000000ULL) >>  8) |
-     (((x) & 0x00000000ff000000ULL) <<  8) |
-     (((x) & 0x0000000000ff0000ULL) << 24) |
-     (((x) & 0x000000000000ff00ULL) << 40) |
-     (((x) & 0x00000000000000ffULL) << 56));
-}
 
 #endif /* _BYTESWAP_H */

extras/mini-os/include/endian.h

@@ -0,0 +1,15 @@
+#ifndef	_ENDIAN_H_
+#define	_ENDIAN_H_
+
+#define	__LITTLE_ENDIAN	1234
+#define	__BIG_ENDIAN	4321
+#define	__PDP_ENDIAN	3412
+
+#define ARCH_ENDIAN_H
+/* This will define __BYTE_ORDER for the current arch */
+#include <arch_endian.h>
+#undef ARCH_ENDIAN_H
+
+#include <arch_wordsize.h>
+
+#endif	/* endian.h */

extras/mini-os/include/x86/arch_endian.h

@@ -0,0 +1,7 @@
+#ifndef	ARCH_ENDIAN_H
+#error "Do not include arch_endian by itself, include endian.h"
+#else
+
+#define __BYTE_ORDER __LITTLE_ENDIAN
+
+#endif

extras/mini-os/include/x86/x86_32/arch_wordsize.h

@@ -0,0 +1 @@
+#define __WORDSIZE 32

extras/mini-os/include/x86/x86_64/arch_wordsize.h

@@ -0,0 +1,2 @@
+#define __WORDSIZE 64
+#define __WORDSIZE_COMPAT32 1