mirror of https://gitee.com/openkylin/qemu.git
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/*
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* Common Hardware Reference Platform NVRAM helper functions.
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*
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* The CHRP NVRAM layout is used by OpenBIOS and SLOF. See CHRP
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* specification, chapter 8, or the LoPAPR specification for details
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* about the NVRAM layout.
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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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#include "qemu/osdep.h"
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#include "qemu/cutils.h"
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#include "hw/nvram/chrp_nvram.h"
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#include "sysemu/sysemu.h"
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static int chrp_nvram_set_var(uint8_t *nvram, int addr, const char *str)
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{
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int len;
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len = strlen(str) + 1;
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memcpy(&nvram[addr], str, len);
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return addr + len;
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}
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/**
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* Create a "system partition", used for the Open Firmware
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* environment variables.
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*/
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int chrp_nvram_create_system_partition(uint8_t *data, int min_len)
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{
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ChrpNvramPartHdr *part_header;
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unsigned int i;
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int end;
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part_header = (ChrpNvramPartHdr *)data;
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part_header->signature = CHRP_NVPART_SYSTEM;
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pstrcpy(part_header->name, sizeof(part_header->name), "system");
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end = sizeof(ChrpNvramPartHdr);
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for (i = 0; i < nb_prom_envs; i++) {
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end = chrp_nvram_set_var(data, end, prom_envs[i]);
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}
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/* End marker */
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data[end++] = '\0';
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end = (end + 15) & ~15;
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/* XXX: OpenBIOS is not able to grow up a partition. Leave some space for
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new variables. */
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if (end < min_len) {
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end = min_len;
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}
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chrp_nvram_finish_partition(part_header, end);
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return end;
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}
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/**
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* Create a "free space" partition
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*/
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int chrp_nvram_create_free_partition(uint8_t *data, int len)
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{
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ChrpNvramPartHdr *part_header;
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part_header = (ChrpNvramPartHdr *)data;
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part_header->signature = CHRP_NVPART_FREE;
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pstrcpy(part_header->name, sizeof(part_header->name), "free");
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chrp_nvram_finish_partition(part_header, len);
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return len;
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}
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