[cadcdev-svn-commits] [SCM] branch master updated. v2.0.0-195-g4fafabb

[Lawrence S. <ljs...@us...>]

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- Log -----------------------------------------------------------------
commit 4fafabbed82481771967c8439d2220c0a67793df
Author: Lawrence Sebald <ljs...@us...>
Date:   Wed Dec 23 22:47:16 2015 -0500

    Add <arch/byteorder.h>.

-----------------------------------------------------------------------

Summary of changes:
 include/kos.h                                  |    1 +
 kernel/arch/dreamcast/include/arch/byteorder.h |  118 ++++++++++++++++++++++++
 2 files changed, 119 insertions(+), 0 deletions(-)
 create mode 100644 kernel/arch/dreamcast/include/arch/byteorder.h

diff --git a/include/kos.h b/include/kos.h
index 4129df3..55c7b1c 100644
--- a/include/kos.h
+++ b/include/kos.h
@@ -64,6 +64,7 @@ __BEGIN_DECLS
 #include <arch/types.h>
 #include <arch/exec.h>
 #include <arch/stack.h>
+#include <arch/byteorder.h>
 
 #ifdef _arch_dreamcast
 #   include <arch/gdb.h>
diff --git a/kernel/arch/dreamcast/include/arch/byteorder.h b/kernel/arch/dreamcast/include/arch/byteorder.h
new file mode 100644
index 0000000..9b5ffea
--- /dev/null
+++ b/kernel/arch/dreamcast/include/arch/byteorder.h
@@ -0,0 +1,118 @@
+/* KallistiOS ##version##
+
+   arch/dreamcast/include/arch/byteorder.h
+   Copyright (C) 2015 Lawrence Sebald
+
+*/
+
+/** \file   arch/byteorder.h
+    \brief  Byte-order related macros.
+
+    This file contains architecture-specific byte-order related macros and/or
+    functions. Each platform should define six macros/functions in this file:
+    arch_swap16, arch_swap32, arch_ntohs, arch_ntohl, arch_htons, and
+    arch_htonl. The first two of these swap the byte order of 16-bit and 32-bit
+    integers, respectively. The other four macros will be used by the kernel to
+    implement the network-related byte order functions.
+
+    \author Lawrence Sebald
+*/
+
+#ifndef __ARCH_BYTEORDER_H
+#define __ARCH_BYTEORDER_H
+
+#include <sys/cdefs.h>
+__BEGIN_DECLS
+
+#include <sys/_types.h>
+
+/** \brief  Define the byte-order of the platform in use. */
+#define BYTE_ORDER      LITTLE_ENDIAN
+
+/** \brief  Swap the byte order of a 16-bit integer.
+
+    This macro swaps the byte order of a 16-bit integer in an architecture-
+    defined manner.
+
+    \param  x           The value to be byte-swapped. This should be a uint16,
+                        or equivalent.
+    \return             The swapped value.
+*/
+#define arch_swap16(x) ({ \
+    uint16 __x = (x); \
+    __asm__ __volatile__("swap.b %0, %0" : "=r" (__x) : "0" (__x)); \
+    __x; \
+})
+
+/** \brief  Swap the byte order of a 32-bit integer.
+
+    This macro swaps the byte order of a 32-bit integer in an architecture-
+    defined manner.
+
+    \param  x           The value to be byte-swapped. This should be a uint32,
+                        or equivalent.
+    \return             The swapped value.
+*/
+#define arch_swap32(x) ({ \
+    uint32 __x = (x); \
+    __asm__ __volatile__("swap.b %0, %0\n\t" \
+                         "swap.w %0, %0\n\t" \
+                         "swap.b %0, %0\n\t" : "=r"(__x) : "0" (__x)); \
+    __x; \
+})
+
+/** \brief  Convert network-to-host short.
+
+    This macro converts a network byte order (big endian) value to the host's
+    native byte order. On a little endian system (like the Dreamcast), this
+    should just call arch_swap16(). On a big endian system, this should be a
+    no-op.
+
+    \param  x           The value to be converted. This should be a uint16,
+                        or equivalent.
+    \return             The converted value.
+*/
+#define arch_ntohs(x) arch_swap16(x)
+
+/** \brief  Convert network-to-host long.
+
+    This macro converts a network byte order (big endian) value to the host's
+    native byte order. On a little endian system (like the Dreamcast), this
+    should just call arch_swap32(). On a big endian system, this should be a
+    no-op.
+
+    \param  x           The value to be converted. This should be a uint32,
+                        or equivalent.
+    \return             The converted value.
+*/
+#define arch_ntohl(x) arch_swap32(x)
+
+/** \brief  Convert host-to-network short.
+
+    This macro converts a value in the host's native byte order to network byte
+    order (big endian). On a little endian system (like the Dreamcast), this
+    should just call arch_swap16(). On a big endian system, this should be a
+    no-op.
+
+    \param  x           The value to be converted. This should be a uint16,
+                        or equivalent.
+    \return             The converted value.
+*/
+#define arch_htons(x) arch_swap16(x)
+
+/** \brief  Convert host-to-network long.
+
+    This macro converts a value in the host's native byte order to network byte
+    order (big endian). On a little endian system (like the Dreamcast), this
+    should just call arch_swap32(). On a big endian system, this should be a
+    no-op.
+
+    \param  x           The value to be converted. This should be a uint32,
+                        or equivalent.
+    \return             The converted value.
+*/
+#define arch_htonl(x) arch_swap32(x)
+
+__END_DECLS
+
+#endif /* !__ARCH_BYTEORDER_H */


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