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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 03/11] 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@xxxxxxxxxx>
Acked-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
diff --git a/extras/mini-os/include/byteorder.h
b/extras/mini-os/include/byteorder.h
new file mode 100644
index 0000000..c0e29df
--- /dev/null
+++ b/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
diff --git a/extras/mini-os/include/byteswap.h
b/extras/mini-os/include/byteswap.h
index 46821ae..992c8bd 100644
--- a/extras/mini-os/include/byteswap.h
+++ b/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));
-}
-
-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));
-}
+
+#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
+
+
+
#endif /* _BYTESWAP_H */
diff --git a/extras/mini-os/include/endian.h b/extras/mini-os/include/endian.h
new file mode 100644
index 0000000..cdf432b
--- /dev/null
+++ b/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 */
diff --git a/extras/mini-os/include/ia64/arch_endian.h
b/extras/mini-os/include/ia64/arch_endian.h
new file mode 100644
index 0000000..0771683
--- /dev/null
+++ b/extras/mini-os/include/ia64/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
diff --git a/extras/mini-os/include/ia64/arch_wordsize.h
b/extras/mini-os/include/ia64/arch_wordsize.h
new file mode 100644
index 0000000..1b5a00f
--- /dev/null
+++ b/extras/mini-os/include/ia64/arch_wordsize.h
@@ -0,0 +1 @@
+#define __WORDSIZE 64
diff --git a/extras/mini-os/include/x86/arch_endian.h
b/extras/mini-os/include/x86/arch_endian.h
new file mode 100644
index 0000000..0771683
--- /dev/null
+++ b/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
diff --git a/extras/mini-os/include/x86/x86_32/arch_wordsize.h
b/extras/mini-os/include/x86/x86_32/arch_wordsize.h
new file mode 100644
index 0000000..b47eee9
--- /dev/null
+++ b/extras/mini-os/include/x86/x86_32/arch_wordsize.h
@@ -0,0 +1 @@
+#define __WORDSIZE 32
diff --git a/extras/mini-os/include/x86/x86_64/arch_wordsize.h
b/extras/mini-os/include/x86/x86_64/arch_wordsize.h
new file mode 100644
index 0000000..3048136
--- /dev/null
+++ b/extras/mini-os/include/x86/x86_64/arch_wordsize.h
@@ -0,0 +1,2 @@
+#define __WORDSIZE 64
+#define __WORDSIZE_COMPAT32 1
--
1.7.9.5
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