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

[coreboot.git] / payloads / libpayload / libc / lib.c

diff --git a/payloads/libpayload/libc/lib.c b/payloads/libpayload/libc/lib.c
new file mode 100644 (file)
index 0000000..9200455
--- /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);
+}
+