| 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 *header, 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 | /* chrp_nvram_create_system_partition() failure is fatal */ |
| 54 | int chrp_nvram_create_system_partition(uint8_t *data, int min_len, int max_len); |
| 55 | int chrp_nvram_create_free_partition(uint8_t *data, int len); |
| 56 | |
| 57 | #endif |