blob: ae2c4e9db0d497fbe43f57e04221304311629ba8 (
plain)
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
90
|
#ifndef _ASM_E820_TYPES_H
#define _ASM_E820_TYPES_H
#include <uapi/asm/e820/types.h>
/*
* The legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the
* constrained space in the zeropage.
*
* On large systems we can easily have thousands of nodes with RAM,
* which cannot be fit into so few entries - so we have a mechanism
* to extend the e820 table size at build-time, via the E820_X_MAX
* define below.
*
* ( Those extra entries are enumerated via the EFI memory map, not
* via the legacy zeropage mechanism. )
*
* Size our internal memory map tables to have room for these additional
* entries, based on a heuristic calculation: up to three entries per
* NUMA node, plus E820MAX for some extra space.
*
* This allows for bootstrap/firmware quirks such as possible duplicate
* E820 entries that might need room in the same arrays, prior to the
* call to sanitize_e820_table() to remove duplicates. The allowance
* of three memory map entries per node is "enough" entries for
* the initial hardware platform motivating this mechanism to make
* use of additional EFI map entries. Future platforms may want
* to allow more than three entries per node or otherwise refine
* this size.
*/
#include <linux/numa.h>
#define E820_X_MAX (E820MAX + 3*MAX_NUMNODES)
/* Our map: */
#define E820MAP 0x2d0
/* Number of entries in E820MAP: */
#define E820NR 0x1e8
#define E820_RAM 1
#define E820_RESERVED 2
#define E820_ACPI 3
#define E820_NVS 4
#define E820_UNUSABLE 5
#define E820_PMEM 7
/*
* This is a non-standardized way to represent ADR or NVDIMM regions that
* persist over a reboot. The kernel will ignore their special capabilities
* unless the CONFIG_X86_PMEM_LEGACY option is set.
*
* ( Note that older platforms also used 6 for the same type of memory,
* but newer versions switched to 12 as 6 was assigned differently. Some
* time they will learn... )
*/
#define E820_PRAM 12
/*
* reserved RAM used by kernel itself
* if CONFIG_INTEL_TXT is enabled, memory of this type will be
* included in the S3 integrity calculation and so should not include
* any memory that BIOS might alter over the S3 transition
*/
#define E820_RESERVED_KERN 128
/*
* The whole array of E820 entries:
*/
struct e820_table {
__u32 nr_map;
struct e820_entry map[E820_X_MAX];
};
/*
* Various well-known legacy memory ranges in physical memory:
*/
#define ISA_START_ADDRESS 0x000a0000
#define ISA_END_ADDRESS 0x00100000
#define BIOS_BEGIN 0x000a0000
#define BIOS_END 0x00100000
#define HIGH_MEMORY 0x00100000
#define BIOS_ROM_BASE 0xffe00000
#define BIOS_ROM_END 0xffffffff
#endif /* _ASM_E820_TYPES_H */
|
