1 /* Copyright 2013-2014 IBM Corp.
2 *
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
12 * implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <skiboot.h>
18 #include <opal.h>
19 #include <mem_region.h>
20 #include <lock.h>
21
22 static struct mem_region *nvram_region;
23 static struct lock fake_nvram_lock = LOCK_UNLOCKED;
24
fake_nvram_info(uint32_t * total_size)25 int fake_nvram_info(uint32_t *total_size)
26 {
27 nvram_region = find_mem_region("ibm,fake-nvram");
28
29 if (!nvram_region)
30 return OPAL_HARDWARE;
31
32 *total_size = nvram_region->len;
33
34 return OPAL_SUCCESS;
35 }
36
fake_nvram_start_read(void * dst,uint32_t src,uint32_t len)37 int fake_nvram_start_read(void *dst, uint32_t src, uint32_t len)
38 {
39 if (!nvram_region)
40 return -ENODEV;
41
42 lock(&fake_nvram_lock);
43 memcpy(dst, (void *) (nvram_region->start + src), len);
44 unlock(&fake_nvram_lock);
45
46 nvram_read_complete(true);
47
48 return 0;
49 }
50
fake_nvram_write(uint32_t offset,void * src,uint32_t size)51 int fake_nvram_write(uint32_t offset, void *src, uint32_t size)
52 {
53 if (!nvram_region)
54 return OPAL_HARDWARE;
55
56 lock(&fake_nvram_lock);
57 memcpy((void *) (nvram_region->start + offset), src, size);
58 unlock(&fake_nvram_lock);
59
60 return 0;
61 }
62
63