126 lines
3.9 KiB
C
126 lines
3.9 KiB
C
/*
|
|
* This file is part of the libpayload project.
|
|
*
|
|
* Copyright (C) 2008 coresystems GmbH
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <libpayload.h>
|
|
#include <coreboot_tables.h>
|
|
|
|
static int options_checksum_valid(void)
|
|
{
|
|
int i;
|
|
int range_start = lib_sysinfo.cmos_range_start / 8;
|
|
int range_end = lib_sysinfo.cmos_range_end / 8;
|
|
int checksum_location = lib_sysinfo.cmos_checksum_location / 8;
|
|
u16 checksum = 0, checksum_old;
|
|
|
|
for(i = range_start; i <= range_end; i++) {
|
|
checksum += nvram_read(i);
|
|
}
|
|
checksum = (~checksum)&0xffff;
|
|
|
|
checksum_old = ((nvram_read(checksum_location)<<8) | nvram_read(checksum_location+1));
|
|
|
|
return (checksum_old == checksum);
|
|
}
|
|
|
|
void fix_options_checksum(void)
|
|
{
|
|
int i;
|
|
int range_start = lib_sysinfo.cmos_range_start / 8;
|
|
int range_end = lib_sysinfo.cmos_range_end / 8;
|
|
int checksum_location = lib_sysinfo.cmos_checksum_location / 8;
|
|
u16 checksum = 0;
|
|
|
|
for(i = range_start; i <= range_end; i++) {
|
|
checksum += nvram_read(i);
|
|
}
|
|
checksum = (~checksum)&0xffff;
|
|
|
|
nvram_write((checksum >> 8), checksum_location);
|
|
nvram_write((checksum & 0xff), checksum_location + 1);
|
|
}
|
|
|
|
static int get_cmos_value(u32 bitnum, u32 len, void *valptr)
|
|
{
|
|
u8 *value = (u8 *)valptr;
|
|
int offs = 0;
|
|
u32 addr, bit;
|
|
u8 reg8;
|
|
|
|
/* Convert to byte borders */
|
|
addr=(bitnum / 8);
|
|
bit=(bitnum % 8);
|
|
|
|
/* Handle single byte or less */
|
|
if(len <= 8) {
|
|
reg8 = nvram_read(addr);
|
|
reg8 >>= bit;
|
|
value[0] = reg8 & ((1 << len) -1);
|
|
return 0;
|
|
}
|
|
|
|
/* When handling more than a byte, copy whole bytes */
|
|
while (len > 0) {
|
|
len -= 8;
|
|
value[offs++]=nvram_read(addr++);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int get_option_from(struct cb_cmos_option_table *option_table, void *dest, char *name)
|
|
{
|
|
struct cb_cmos_entries *cmos_entry;
|
|
int len = strnlen(name, CMOS_MAX_NAME_LENGTH);
|
|
|
|
/* cmos entries are located right after the option table */
|
|
|
|
for ( cmos_entry = (struct cb_cmos_entries*)((unsigned char *)option_table + option_table->header_length);
|
|
cmos_entry->tag == CB_TAG_OPTION;
|
|
cmos_entry = (struct cb_cmos_entries*)((unsigned char *)cmos_entry + cmos_entry->size)) {
|
|
if (memcmp((const char*)cmos_entry->name, name, len))
|
|
continue;
|
|
if(get_cmos_value(cmos_entry->bit, cmos_entry->length, dest))
|
|
return 1;
|
|
|
|
if(!options_checksum_valid())
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
printf("ERROR: No such CMOS option (%s)\n", name);
|
|
return 1;
|
|
}
|
|
|
|
int get_option(void *dest, char *name)
|
|
{
|
|
struct cb_cmos_option_table *option_table = phys_to_virt(lib_sysinfo.option_table);
|
|
return get_option_from(option_table, dest, name);
|
|
}
|