-
Notifications
You must be signed in to change notification settings - Fork 6
/
linuxbios_tables.h
89 lines (76 loc) · 2.57 KB
/
linuxbios_tables.h
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
76
77
78
79
80
81
82
83
84
85
86
87
88
89
#ifndef LINUXBIOS_TABLES_H
#define LINUXBIOS_TABLES_H
#include "stdint.h"
/* The linuxbios table information is for conveying information
* from the firmware to the loaded OS image. Primarily this
* is expected to be information that cannot be discovered by
* other means, such as quering the hardware directly.
*
* All of the information should be Position Independent Data.
* That is it should be safe to relocated any of the information
* without it's meaning/correctnes changing. For table that
* can reasonably be used on multiple architectures the data
* size should be fixed. This should ease the transition between
* 32 bit and 64 bit architectures etc.
*
* The completeness test for the information in this table is:
* - Can all of the hardware be detected?
* - Are the per motherboard constants available?
* - Is there enough to allow a kernel to run that was written before
* a particular motherboard is constructed? (Assuming the kernel
* has drivers for all of the hardware but it does not have
* assumptions on how the hardware is connected together).
*
* With this test it should be straight forward to determine if a
* table entry is required or not. This should remove much of the
* long term compatibility burden as table entries which are
* irrelevant or have been replaced by better alternatives may be
* dropped. Of course it is polite and expidite to include extra
* table entries and be backwards compatible, but it is not required.
*/
struct lb_header
{
uint8_t signature[4]; /* LBIO */
uint32_t header_bytes;
uint32_t header_checksum;
uint32_t table_bytes;
uint32_t table_checksum;
uint32_t table_entries;
};
/* Every entry in the boot enviroment list will correspond to a boot
* info record. Encoding both type and size. The type is obviously
* so you can tell what it is. The size allows you to skip that
* boot enviroment record if you don't know what it easy. This allows
* forward compatibility with records not yet defined.
*/
struct lb_record {
uint32_t tag; /* tag ID */
uint32_t size; /* size of record (in bytes) */
};
#define LB_TAG_UNUSED 0x0000
#define LB_TAG_MEMORY 0x0001
#define LB_TAG_FORWARD 0x0011
struct lb_memory_range {
uint64_t start;
uint64_t size;
uint32_t type;
#define LB_MEM_RAM 1
#define LB_MEM_RESERVED 2
};
struct lb_memory {
uint32_t tag;
uint32_t size;
struct lb_memory_range map[0];
};
#define LB_TAG_HWRPB 0x0002
struct lb_hwrpb {
uint32_t tag;
uint32_t size;
uint64_t hwrpb;
};
struct lb_forward {
uint32_t tag;
uint32_t size;
uint64_t forward;
};
#endif /* LINUXBIOS_TABLES_H */