[Xen-devel] [PATCH mini-os enhancements for vtpm 3/8] add endian support to mini-os

[Matthew Fioravante <matthew.fioravante@xxxxxxxxxx>]

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

Signed off by: Matthew Fioravante matthew.fioravante@xxxxxxxxxx

diff --git a/extras/mini-os/include/byteorder.h
b/extras/mini-os/include/byteorder.h
--- /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
--- 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
--- /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
--- /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
--- /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
--- /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
--- /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
--- /dev/null
+++ b/extras/mini-os/include/x86/x86_64/arch_wordsize.h
@@ -0,0 +1,2 @@
+#define __WORDSIZE 64
+#define __WORDSIZE_COMPAT32 1

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