57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
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/*
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* Common Hardware Reference Platform NVRAM functions.
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*
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* This code is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CHRP_NVRAM_H
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#define CHRP_NVRAM_H
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#include "qemu/bswap.h"
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/* OpenBIOS NVRAM partition */
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typedef struct {
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uint8_t signature;
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uint8_t checksum;
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uint16_t len; /* Big endian, length divided by 16 */
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char name[12];
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} ChrpNvramPartHdr;
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#define CHRP_NVPART_SYSTEM 0x70
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#define CHRP_NVPART_FREE 0x7f
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static inline void
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chrp_nvram_finish_partition(ChrpNvramPartHdr *header, uint32_t size)
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{
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unsigned int i, sum;
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uint8_t *tmpptr;
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/* Length divided by 16 */
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header->len = cpu_to_be16(size >> 4);
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/* Checksum */
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tmpptr = (uint8_t *)header;
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sum = *tmpptr;
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for (i = 0; i < 14; i++) {
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sum += tmpptr[2 + i];
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sum = (sum + ((sum & 0xff00) >> 8)) & 0xff;
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}
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header->checksum = sum & 0xff;
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}
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int chrp_nvram_create_system_partition(uint8_t *data, int min_len);
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int chrp_nvram_create_free_partition(uint8_t *data, int len);
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#endif
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