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

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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
This commit is contained in:
Uwe Hermann
2008-03-27 23:26:40 +00:00
parent a0c0093a09
commit 8cc38d2f13
6 changed files with 142 additions and 2 deletions
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3
payloads/libpayload/libc/Makefile.inc
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@ -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

51
payloads/libpayload/libc/lib.c Normal file
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@ -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);
}