forked from mirror/qemu
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
|
|
* Common Hardware Reference Platform NVRAM functions.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published
|
|
* by the Free Software Foundation; either version 2 of the License,
|
|
* or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef CHRP_NVRAM_H
|
|
#define CHRP_NVRAM_H
|
|
|
|
#include "qemu/bswap.h"
|
|
|
|
/* OpenBIOS NVRAM partition */
|
|
typedef struct {
|
|
uint8_t signature;
|
|
uint8_t checksum;
|
|
uint16_t len; /* Big endian, length divided by 16 */
|
|
char name[12];
|
|
} ChrpNvramPartHdr;
|
|
|
|
#define CHRP_NVPART_SYSTEM 0x70
|
|
#define CHRP_NVPART_FREE 0x7f
|
|
|
|
static inline void
|
|
chrp_nvram_finish_partition(ChrpNvramPartHdr *header, uint32_t size)
|
|
{
|
|
unsigned int i, sum;
|
|
uint8_t *tmpptr;
|
|
|
|
/* Length divided by 16 */
|
|
header->len = cpu_to_be16(size >> 4);
|
|
|
|
/* Checksum */
|
|
tmpptr = (uint8_t *)header;
|
|
sum = *tmpptr;
|
|
for (i = 0; i < 14; i++) {
|
|
sum += tmpptr[2 + i];
|
|
sum = (sum + ((sum & 0xff00) >> 8)) & 0xff;
|
|
}
|
|
header->checksum = sum & 0xff;
|
|
}
|
|
|
|
/* chrp_nvram_create_system_partition() failure is fatal */
|
|
int chrp_nvram_create_system_partition(uint8_t *data, int min_len, int max_len);
|
|
int chrp_nvram_create_free_partition(uint8_t *data, int len);
|
|
|
|
#endif
|