byteorder.h: Add endianess conversion functions

SeaBIOS until now only supported the little-endian x86 platform.
PA-RISC is big endian, so add the necessary conversion functions
depending on the architecture.

Signed-off-by: Helge Deller <deller@gmx.de>

1 files changed, 74 insertions, 0 deletions

diff --git a/src/byteorder.h b/src/byteorder.h
index 928c1b8..f0dffa3 100644
--- a/src/byteorder.h
+++ b/src/byteorder.h
@@ -1,8 +1,17 @@
 #ifndef __BYTEORDER_H
 #define __BYTEORDER_H
 
+#include "autoconf.h"
 #include "types.h" // u32
 
+#if CONFIG_X86
+#define TARGET_LITTLE_ENDIAN
+#elif CONFIG_PARISC
+#define TARGET_BIG_ENDIAN
+#else
+#error "unknown endianess"
+#endif
+
 static inline u16 __swab16_constant(u16 val) {
     return (val<<8) | (val>>8);
 }
@@ -13,7 +22,18 @@ static inline u64 __swab64_constant(u64 val) {
     return ((u64)__swab32_constant(val) << 32) | __swab32_constant(val>>32);
 }
 static inline u32 __swab32(u32 val) {
+#if CONFIG_X86
     asm("bswapl %0" : "+r"(val));
+#elif CONFIG_PARISC
+    unsigned int temp;
+    asm("shd %0, %0, 16, %1\n\t"	/* shift abcdabcd -> cdab */
+        "dep %1, 15, 8, %1\n\t"		/* deposit cdab -> cbab */
+        "shd %0, %1, 8, %0"		/* shift abcdcbab -> dcba */
+        : "=r" (val), "=&r" (temp)
+        : "0" (val));
+#else
+    #error "unknown arch"
+#endif
     return val;
 }
 static inline u64 __swab64(u64 val) {
@@ -30,6 +50,55 @@ static inline u64 __swab64(u64 val) {
 #define swab64(x) (__builtin_constant_p((u64)(x)) \
                    ? __swab64_constant(x) : __swab64(x))
 
+#if defined(TARGET_BIG_ENDIAN)
+static inline u16 cpu_to_le16(u16 x) {
+    return swab16(x);
+}
+static inline u32 cpu_to_le32(u32 x) {
+    return swab32(x);
+}
+static inline u64 cpu_to_le64(u64 x) {
+    return swab64(x);
+}
+static inline u16 le16_to_cpu(u16 x) {
+    return swab16(x);
+}
+static inline u32 le32_to_cpu(u32 x) {
+    return swab32(x);
+}
+static inline u64 le64_to_cpu(u64 x) {
+    return swab64(x);
+}
+
+static inline u16 cpu_to_be16(u16 x) {
+    return x;
+}
+static inline u32 cpu_to_be32(u32 x) {
+    return x;
+}
+static inline u64 cpu_to_be64(u64 x) {
+    return x;
+}
+static inline u16 be16_to_cpu(u16 x) {
+    return x;
+}
+static inline u32 be32_to_cpu(u32 x) {
+    return x;
+}
+static inline u64 be64_to_cpu(u64 x) {
+    return x;
+}
+
+static inline void convert_to_le32(u32 *script, unsigned long bytes)
+{
+    while (bytes > 0) {
+	*script = cpu_to_le32(*script);
+	script++;
+	bytes -= sizeof(u32);
+    }
+}
+
+#else /* defined(TARGET_LITTLE_ENDIAN) */
 static inline u16 cpu_to_le16(u16 x) {
     return x;
 }
@@ -68,4 +137,9 @@ static inline u64 be64_to_cpu(u64 x) {
     return swab64(x);
 }
 
+static inline void convert_to_le32(u32 *script, unsigned long bytes)
+{
+}
+#endif
+
 #endif // byteorder.h