cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

chrp_nvram.h (1684B)

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