14e2277962
while others dislike them being extra commits, let's clean them up once and for all for the existing code. If it's ugly, let it only be ugly once :-) Signed-off-by: Stefan Reinauer <stepan@coresystems.de> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5507 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2008 coresystems GmbH
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <libpayload.h>
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#include <coreboot_tables.h>
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static int options_checksum_valid(void)
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{
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int i;
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int range_start = lib_sysinfo.cmos_range_start / 8;
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int range_end = lib_sysinfo.cmos_range_end / 8;
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int checksum_location = lib_sysinfo.cmos_checksum_location / 8;
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u16 checksum = 0, checksum_old;
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for(i = range_start; i <= range_end; i++) {
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checksum += nvram_read(i);
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}
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checksum = (~checksum)&0xffff;
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checksum_old = ((nvram_read(checksum_location)<<8) | nvram_read(checksum_location+1));
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return (checksum_old == checksum);
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}
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static int get_cmos_value(u32 bitnum, u32 len, void *valptr)
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{
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u8 *value = (u8 *)valptr;
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int offs = 0;
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u32 addr, bit;
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u8 reg8;
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/* Convert to byte borders */
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addr=(bitnum / 8);
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bit=(bitnum % 8);
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/* Handle single byte or less */
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if(len <= 8) {
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reg8 = nvram_read(addr);
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reg8 >>= bit;
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value[0] = reg8 & ((1 << len) -1);
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return 0;
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}
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/* When handling more than a byte, copy whole bytes */
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while (len > 0) {
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len -= 8;
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value[offs++]=nvram_read(addr++);
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}
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return 0;
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}
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int get_option(void *dest, char *name)
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{
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struct cb_cmos_option_table *option_table = phys_to_virt(lib_sysinfo.option_table);
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struct cb_cmos_entries *cmos_entry;
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int len = strnlen(name, CMOS_MAX_NAME_LENGTH);
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/* cmos entries are located right after the option table */
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for ( cmos_entry = (struct cb_cmos_entries*)((unsigned char *)option_table + option_table->header_length);
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cmos_entry->tag == CB_TAG_OPTION;
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cmos_entry = (struct cb_cmos_entries*)((unsigned char *)cmos_entry + cmos_entry->size)) {
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if (memcmp((const char*)cmos_entry->name, name, len))
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continue;
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if(get_cmos_value(cmos_entry->bit, cmos_entry->length, dest))
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return 1;
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if(!options_checksum_valid())
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return 1;
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return 0;
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}
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printf("ERROR: No such CMOS option (%s)\n", name);
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return 1;
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}
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