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 | |
27 | static 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 | */ |
41 | int chrp_nvram_create_system_partition(uint8_t *data, int min_len) |
42 | { |
43 | ChrpNvramPartHdr *; |
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 | */ |
73 | int chrp_nvram_create_free_partition(uint8_t *data, int len) |
74 | { |
75 | ChrpNvramPartHdr *; |
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 | |