First bunch of rework, stil work in progress

1 files changed, 61 insertions, 0 deletions

diff --git a/compiler.h b/compiler.h
new file mode 100644
index 0000000..1005017
--- /dev/null
+++ b/compiler.h
@@ -0,0 +1,61 @@
+#ifndef _COMPILER_H_
+#define _COMPILER_H_
+
+#include <stdint.h>
+
+#ifdef __GNUC__
+# define __packed	__attribute__ ((packed))
+# define __unused	__attribute__ ((unused))
+# define __noreturn	__attribute__ ((noreturn))
+# define likely(x)	__builtin_expect(!!(x), 1)
+# define unlikely(x)	__builtin_expect(!!(x), 0)
+
+static inline void prefetch(const void *ptr)
+{
+	/* We could use some arch specific instructions here, but a GCC builtin
+	   is fine for now */
+	__builtin_prefetch(ptr, 0, 3);
+}
+
+static inline int32_t bswap_32(int32_t x)
+{
+	return __builtin_bswap32(x);
+}
+
+#else
+# define __packed
+# define __unused
+# define __noreturn
+# define likely(x) (x)
+# define unlikely(x) (x)
+
+static inline prefetch(const void *ptr)
+{
+	/* empty */
+}
+
+static inline int32_t bswap_32(int32_t x)
+{
+	int32_t ret = 0;
+
+	ret |= ((x & 0xFF000000) >> 24);
+	ret |= ((x & 0x00FF0000) >> 8);
+	ret |= ((x & 0x0000FF00) << 8);
+	ret |= ((x & 0x000000FF) << 24);
+	return ret;
+
+}
+
+#endif /* __GNUC__ */
+
+#ifndef offsetof
+# define offsetof(type, member) ((size_t) &((type *)0)->member)
+#endif /* offsetof */
+
+#ifndef container_of
+# define container_of(ptr, type, member) ({				\
+		const typeof( ((type *)0)->member ) *__mptr = (ptr);	\
+		(type *)( (char *)__mptr - offsetof(type, member) );})
+#endif /* container_of */
+
+#endif /* _COMPILER_H_ */