Add initial support for some basic CMOS read/write functions and the

bcd2dec()/dec2bcd() functions we'll need for (among other things)
converting some date/time parameters in CMOS.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Jordan Crouse <jordan.crouse@amd.com>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3192 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

2 files changed, 52 insertions, 2 deletions

diff --git a/payloads/libpayload/libc/Makefile.inc b/payloads/libpayload/libc/Makefile.inc
index 2c1ef72564..ee64b60644 100644
--- a/payloads/libpayload/libc/Makefile.inc
+++ b/payloads/libpayload/libc/Makefile.inc
@@ -28,5 +28,4 @@
 ##
 
 TARGETS-y += libc/malloc.o libc/printf.o libc/console.o libc/string.o
-TARGETS-y += libc/memory.o libc/ctype.o
-TARGETS-y += libc/ipchecksum.o
+TARGETS-y += libc/memory.o libc/ctype.o libc/ipchecksum.o libc/lib.o
diff --git a/payloads/libpayload/libc/lib.c b/payloads/libpayload/libc/lib.c
new file mode 100644
index 0000000000..9200455a8a
--- /dev/null
+++ b/payloads/libpayload/libc/lib.c
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Convert a number in BCD format to decimal.
+ *
+ * @param b The BCD number.
+ * @return The given BCD number in decimal format.
+ */
+int bcd2dec(int b)
+{
+	return ((b >> 4) & 0x0f) * 10 + (b & 0x0f);
+}
+
+/*
+ * Convert a number in decimal format into the BCD format.
+ *
+ * @param d The decimal number.
+ * @return The given decimal number in BCD format.
+ */
+int dec2bcd(int d)
+{
+	return ((d / 10) << 4) | (d % 10);
+}
+