1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
#include "mboot.h"
#include "serial.h"
#include <stddef.h>
#include <lib.h>
static void read_cmdline(struct mboot_tag *tag, char *data, uint8_t len) {
if (len >= CMDLINE_MAX)
len = CMDLINE_MAX; // truncate :(
memcpy(tag->data.cmdline, data, len);
tag->data.cmdline[len] = '\0';
}
static void read_memorymap(struct mboot_tag *tag, uint64_t size, uint32_t *data) {
tag->data.memory_map = (struct memory_map *) data;
tag->data.memory_map->size = size;
}
static void read_xsdp(struct mboot_tag *tag, char *data) {
tag->data.rootsdp = (void *) data;
}
static uint32_t *read_tag(struct mboot_info *info, uint32_t *data) {
struct mboot_tag tag;
tag.type = *((uint16_t *)data);
tag.size = data[1];
tag.valid = 1;
uint8_t data_len = tag.size - 2 * sizeof(uint32_t);
switch (tag.type) {
case MBOOT_CMDLINE:
read_cmdline(&tag, (char *)(data + 2), data_len);
break;
case MBOOT_MEMORYMAP:
read_memorymap(&tag, tag.size, data + 2);
break;
case MBOOT_XSDP:
read_xsdp(&tag, (char *) (data + 2));
break;
default:
break;
}
info->tags[tag.type] = tag;
if(tag.size % 8 != 0) {
tag.size += 8 - (tag.size % 8);
}
return data + tag.size / sizeof(uint32_t);
}
struct mboot_info mboot_load_info(const void *mboot_info) {
struct mboot_info info = {0};
uint32_t* data = (uint32_t*) mboot_info;
info.total_size = *data++;
info.reserved = *data++;
while((uint8_t*) data < (uint8_t*) mboot_info + info.total_size) {
data = read_tag(&info, data);
}
return info;
}
struct mboot_tag *mboot_get_tag(struct mboot_info *info, enum mboot_tag_type type) {
if (info->tags[type].valid) {
return &info->tags[type];
} else {
return NULL;
}
}
|
