1/*
2 * Common Hardware Reference Platform NVRAM helper functions.
3 *
4 * The CHRP NVRAM layout is used by OpenBIOS and SLOF. See CHRP
5 * specification, chapter 8, or the LoPAPR specification for details
6 * about the NVRAM layout.
7 *
8 * This code is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published
10 * by the Free Software Foundation; either version 2 of the License,
11 * or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, see <http://www.gnu.org/licenses/>.
20 */
21
22#include "qemu/osdep.h"
23#include "qemu/cutils.h"
24#include "hw/nvram/chrp_nvram.h"
25#include "sysemu/sysemu.h"
26
27static int chrp_nvram_set_var(uint8_t *nvram, int addr, const char *str)
28{
29 int len;
30
31 len = strlen(str) + 1;
32 memcpy(&nvram[addr], str, len);
33
34 return addr + len;
35}
36
37/**
38 * Create a "system partition", used for the Open Firmware
39 * environment variables.
40 */
41int chrp_nvram_create_system_partition(uint8_t *data, int min_len)
42{
43 ChrpNvramPartHdr *part_header;
44 unsigned int i;
45 int end;
46
47 part_header = (ChrpNvramPartHdr *)data;
48 part_header->signature = CHRP_NVPART_SYSTEM;
49 pstrcpy(part_header->name, sizeof(part_header->name), "system");
50
51 end = sizeof(ChrpNvramPartHdr);
52 for (i = 0; i < nb_prom_envs; i++) {
53 end = chrp_nvram_set_var(data, end, prom_envs[i]);
54 }
55
56 /* End marker */
57 data[end++] = '\0';
58
59 end = (end + 15) & ~15;
60 /* XXX: OpenBIOS is not able to grow up a partition. Leave some space for
61 new variables. */
62 if (end < min_len) {
63 end = min_len;
64 }
65 chrp_nvram_finish_partition(part_header, end);
66
67 return end;
68}
69
70/**
71 * Create a "free space" partition
72 */
73int chrp_nvram_create_free_partition(uint8_t *data, int len)
74{
75 ChrpNvramPartHdr *part_header;
76
77 part_header = (ChrpNvramPartHdr *)data;
78 part_header->signature = CHRP_NVPART_FREE;
79 pstrcpy(part_header->name, sizeof(part_header->name), "free");
80
81 chrp_nvram_finish_partition(part_header, len);
82
83 return len;
84}
85