Refactor the endianness conversion functions and header files.

The endianness of an architecture is now set up automatically using Kconfig
and some common code. The available conversion functions were also expanded
to go to or from a particular endianness. Those use the abbreviation le or be
for little or big endian.

Built for Stumpy and saw coreinfo cbfs support work which uses network
byte order. Used the functions which convert to little endian to implement an
AHCI driver. The source arch is also little endian, so they were effectively
(and successfully) inert.

Change-Id: I3a2d2403855b3e0e93fa34f45e8e542b3e5afeac
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: http://review.coreboot.org/1719
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/payloads/libpayload/include/endian.h b/payloads/libpayload/include/endian.h
new file mode 100644
index 0000000000..cd805e0f4e
--- /dev/null
+++ b/payloads/libpayload/include/endian.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but without any warranty; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef _ENDIAN_H_
+#define _ENDIAN_H_
+
+#include <arch/types.h>
+#include <libpayload-config.h>
+
+#define swap_bytes16(in) (((in & 0xFF) << 8) | ((in & 0xFF00) >> 8))
+#define swap_bytes32(in) (((in & 0xFF) << 24) | ((in & 0xFF00) << 8) | \
+			  ((in & 0xFF0000) >> 8) | ((in & 0xFF000000) >> 24))
+#define swap_bytes64(in) (((uint64_t)swap_bytes32((uint32_t)(in)) << 32) | \
+			  ((uint64_t)swap_bytes32((uint32_t)((in) >> 32))))
+
+
+#if defined CONFIG_BIG_ENDIAN
+
+#define htobew(in) (in)
+#define htobel(in) (in)
+#define htobell(in) (in)
+
+#define htolew(in) swap_bytes16(in)
+#define htolel(in) swap_bytes32(in)
+#define htolell(in) swap_bytes64(in)
+
+#elif defined CONFIG_LITTLE_ENDIAN
+
+#define htobew(in) swap_bytes16(in)
+#define htobel(in) swap_bytes32(in)
+#define htobell(in) swap_bytes64(in)
+
+#define htolew(in) (in)
+#define htolel(in) (in)
+#define htolell(in) (in)
+
+#else
+
+#error Cant tell if the CPU is little or big endian.
+
+#endif
+
+#define betohw(in) htobew(in)
+#define betohl(in) htobel(in)
+#define betohll(in) htobell(in)
+
+#define letohw(in) htolew(in)
+#define letohl(in) htolel(in)
+#define letohll(in) htolell(in)
+
+#define htonw(in) htobew(in)
+#define htonl(in) htobel(in)
+#define htonll(in) htobell(in)
+
+#define ntohw(in) htonw(in)
+#define ntohl(in) htonl(in)
+#define ntohll(in) htonll(in)
+
+#endif