1 | /* |
2 | * Common Hardware Reference Platform NVRAM functions. |
3 | * |
4 | * This code is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published |
6 | * by the Free Software Foundation; either version 2 of the License, |
7 | * or (at your option) any later version. |
8 | * |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
16 | */ |
17 | |
18 | #ifndef CHRP_NVRAM_H |
19 | #define CHRP_NVRAM_H |
20 | |
21 | #include "qemu/bswap.h" |
22 | |
23 | /* OpenBIOS NVRAM partition */ |
24 | typedef struct { |
25 | uint8_t signature; |
26 | uint8_t checksum; |
27 | uint16_t len; /* Big endian, length divided by 16 */ |
28 | char name[12]; |
29 | } ChrpNvramPartHdr; |
30 | |
31 | #define CHRP_NVPART_SYSTEM 0x70 |
32 | #define CHRP_NVPART_FREE 0x7f |
33 | |
34 | static inline void |
35 | chrp_nvram_finish_partition(ChrpNvramPartHdr *, uint32_t size) |
36 | { |
37 | unsigned int i, sum; |
38 | uint8_t *tmpptr; |
39 | |
40 | /* Length divided by 16 */ |
41 | header->len = cpu_to_be16(size >> 4); |
42 | |
43 | /* Checksum */ |
44 | tmpptr = (uint8_t *)header; |
45 | sum = *tmpptr; |
46 | for (i = 0; i < 14; i++) { |
47 | sum += tmpptr[2 + i]; |
48 | sum = (sum + ((sum & 0xff00) >> 8)) & 0xff; |
49 | } |
50 | header->checksum = sum & 0xff; |
51 | } |
52 | |
53 | int chrp_nvram_create_system_partition(uint8_t *data, int min_len); |
54 | int chrp_nvram_create_free_partition(uint8_t *data, int len); |
55 | |
56 | #endif |
57 | |