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 /* OpenBIOS NVRAM partition */ 22 typedef struct { 23 uint8_t signature; 24 uint8_t checksum; 25 uint16_t len; /* Big endian, length divided by 16 */ 26 char name[12]; 27 } ChrpNvramPartHdr; 28 29 #define CHRP_NVPART_SYSTEM 0x70 30 #define CHRP_NVPART_FREE 0x7f 31 32 static inline void 33 chrp_nvram_finish_partition(ChrpNvramPartHdr *header, uint32_t size) 34 { 35 unsigned int i, sum; 36 uint8_t *tmpptr; 37 38 /* Length divided by 16 */ 39 header->len = cpu_to_be16(size >> 4); 40 41 /* Checksum */ 42 tmpptr = (uint8_t *)header; 43 sum = *tmpptr; 44 for (i = 0; i < 14; i++) { 45 sum += tmpptr[2 + i]; 46 sum = (sum + ((sum & 0xff00) >> 8)) & 0xff; 47 } 48 header->checksum = sum & 0xff; 49 } 50 51 int chrp_nvram_create_system_partition(uint8_t *data, int min_len); 52 int chrp_nvram_create_free_partition(uint8_t *data, int len); 53 54 #endif 55