LXR qemu/include/hw/nvram/chrp

   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 */
  24typedef 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
  34static inline void
  35chrp_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
  53int chrp_nvram_create_system_partition(uint8_t *data, int min_len);
  54int chrp_nvram_create_free_partition(uint8_t *data, int len);
  55
  56#endif
  57