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authorGreg Watson <jarrah@users.sourceforge.net>2004-03-13 03:37:11 +0000
committerGreg Watson <jarrah@users.sourceforge.net>2004-03-13 03:37:11 +0000
commit4f566ca1c0cc9e3b2984fe684e7df07d5dc73c53 (patch)
tree87ba326ef87d0540b22307fe09569fd32d905ea4 /src
parent1624782bbe44018a1784cf78839bc4ec95802fdf (diff)
byte swapping
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1406 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src')
-rw-r--r--src/include/swab.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/src/include/swab.h b/src/include/swab.h
new file mode 100644
index 0000000000..3a166863ec
--- /dev/null
+++ b/src/include/swab.h
@@ -0,0 +1,33 @@
+#ifndef _SWAB_H
+#define _SWAB_H
+
+/*
+ * linux/byteorder/swab.h
+ * Byte-swapping, independently from CPU endianness
+ * swabXX[ps]?(foo)
+ *
+ * Francois-Rene Rideau <fare@tunes.org> 19971205
+ * separated swab functions from cpu_to_XX,
+ * to clean up support for bizarre-endian architectures.
+ *
+ * See asm-i386/byteorder.h and suches for examples of how to provide
+ * architecture-dependent optimized versions
+ *
+ */
+
+/* casts are necessary for constants, because we never know how for sure
+ * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
+ */
+#define swab16(x) \
+ ((unsigned short)( \
+ (((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \
+ (((unsigned short)(x) & (unsigned short)0xff00U) >> 8) ))
+
+#define swab32(x) \
+ ((unsigned int)( \
+ (((unsigned int)(x) & (unsigned int)0x000000ffUL) << 24) | \
+ (((unsigned int)(x) & (unsigned int)0x0000ff00UL) << 8) | \
+ (((unsigned int)(x) & (unsigned int)0x00ff0000UL) >> 8) | \
+ (((unsigned int)(x) & (unsigned int)0xff000000UL) >> 24) ))
+
+#endif /* _SWAB_H */