Add the following functions/macros to support byte order conversions and

device drivers for bus system with other endinesses than the CPU (using
interfaces compatible to NetBSD):

- bwap16() and bswap32(). These have optimized implementations on some
  architectures; for those that don't, there exist generic implementations.
- macros to convert from a certain byte order to host byte order and vice
  versa, using a naming scheme like le16toh(), htole16().
  These are implemented using the bswap functions.
- stream bus space access functions, which do not perform a byte order
  conversion (while the normal access functions would if the bus endianess
  differs from the CPU endianess).

htons(), htonl(), ntohs() and ntohl() are implemented using the new
functions above for kernel usage. None of the above interfaces is currently
exported to user land.

Make use of the new functions in a few places where local implementations
of the same functionality existed.

Reviewed by:	mike, bde
Tested on alpha by:	mike

1 files changed, 23 insertions, 0 deletions

diff --git a/sys/sys/mchain.h b/sys/sys/mchain.h
index 57278f4..7b4f7ec 100644
--- a/sys/sys/mchain.h
+++ b/sys/sys/mchain.h
@@ -36,6 +36,28 @@
 
 #include <machine/endian.h>
 
+#ifdef _KERNEL
+
+/*
+ * XXX: remove these defines and change the function calls in the code. Use
+ * it unconditionally if (when) the extended byte order functions become
+ * available in user space.
+ */
+#define	htoles(x)	htole16((x))
+#define	letohs(x)	le16toh((x))
+#define	htolel(x)	htole32((x))
+#define	letohl(x)	le32toh((x))
+#define	htoleq(x)	htole64((int64_t)(x))
+#define	letohq(x)	le64toh((int64_t)(x))
+
+#define	htobes(x)	htobe16((x))
+#define	betohs(x)	be16toh((x))
+#define	htobel(x)	htobe32((x))
+#define	betohl(x)	be32toh((x))
+#define	htobeq(x)	htobe64((int64_t)(x))
+#define	betohq(x)	be64toh((int64_t)(x))
+
+#else
 /*
  * This macros probably belongs to the endian.h
  */
@@ -78,6 +100,7 @@ betohq(int64_t x)
 #define	letohl(x)	((u_int32_t)(x))
 */
 #endif	/* (BYTE_ORDER == LITTLE_ENDIAN) */
+#endif	/* _KERNEL */
 
 
 #ifdef _KERNEL