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/*
* Common Hardware Reference Platform NVRAM helper functions.
*
* The CHRP NVRAM layout is used by OpenBIOS and SLOF. See CHRP
* specification, chapter 8, or the LoPAPR specification for details
* about the NVRAM layout.
*
* This code is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "qemu/error-report.h"
#include "hw/nvram/chrp_nvram.h"
#include "system/system.h"
static int chrp_nvram_set_var(uint8_t *nvram, int addr, const char *str,
int max_len)
{
int len;
len = strlen(str) + 1;
if (max_len < len) {
return -1;
}
memcpy(&nvram[addr], str, len);
return addr + len;
}
/**
* Create a "system partition", used for the Open Firmware
* environment variables.
*/
int chrp_nvram_create_system_partition(uint8_t *data, int min_len, int max_len)
{
ChrpNvramPartHdr *part_header;
unsigned int i;
int end;
if (max_len < sizeof(*part_header)) {
goto fail;
}
part_header = (ChrpNvramPartHdr *)data;
part_header->signature = CHRP_NVPART_SYSTEM;
pstrcpy(part_header->name, sizeof(part_header->name), "system");
end = sizeof(ChrpNvramPartHdr);
for (i = 0; i < nb_prom_envs; i++) {
end = chrp_nvram_set_var(data, end, prom_envs[i], max_len - end);
if (end == -1) {
goto fail;
}
}
/* End marker */
data[end++] = '\0';
end = (end + 15) & ~15;
/* XXX: OpenBIOS is not able to grow up a partition. Leave some space for
new variables. */
if (end < min_len) {
end = min_len;
}
chrp_nvram_finish_partition(part_header, end);
return end;
fail:
error_report("NVRAM is too small. Try to pass less data to -prom-env");
exit(EXIT_FAILURE);
}
/**
* Create a "free space" partition
*/
int chrp_nvram_create_free_partition(uint8_t *data, int len)
{
ChrpNvramPartHdr *part_header;
part_header = (ChrpNvramPartHdr *)data;
part_header->signature = CHRP_NVPART_FREE;
pstrcpy(part_header->name, sizeof(part_header->name), "free");
chrp_nvram_finish_partition(part_header, len);
return len;
}
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