Merge Linus' tree to be be to apply submitted patches to newer code than
[deliverable/linux.git] / arch / x86 / include / uapi / asm / e820.h
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af170c50
DH
1#ifndef _UAPI_ASM_X86_E820_H
2#define _UAPI_ASM_X86_E820_H
3#define E820MAP 0x2d0 /* our map */
4#define E820MAX 128 /* number of entries in E820MAP */
5
6/*
7 * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the
8 * constrained space in the zeropage. If we have more nodes than
9 * that, and if we've booted off EFI firmware, then the EFI tables
10 * passed us from the EFI firmware can list more nodes. Size our
11 * internal memory map tables to have room for these additional
12 * nodes, based on up to three entries per node for which the
13 * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT),
14 * plus E820MAX, allowing space for the possible duplicate E820
15 * entries that might need room in the same arrays, prior to the
16 * call to sanitize_e820_map() to remove duplicates. The allowance
17 * of three memory map entries per node is "enough" entries for
18 * the initial hardware platform motivating this mechanism to make
19 * use of additional EFI map entries. Future platforms may want
20 * to allow more than three entries per node or otherwise refine
21 * this size.
22 */
23
af170c50
DH
24#ifndef __KERNEL__
25#define E820_X_MAX E820MAX
26#endif
27
28#define E820NR 0x1e8 /* # entries in E820MAP */
29
30#define E820_RAM 1
31#define E820_RESERVED 2
32#define E820_ACPI 3
33#define E820_NVS 4
34#define E820_UNUSABLE 5
35
36
37/*
38 * reserved RAM used by kernel itself
39 * if CONFIG_INTEL_TXT is enabled, memory of this type will be
40 * included in the S3 integrity calculation and so should not include
41 * any memory that BIOS might alter over the S3 transition
42 */
43#define E820_RESERVED_KERN 128
44
45#ifndef __ASSEMBLY__
46#include <linux/types.h>
47struct e820entry {
48 __u64 addr; /* start of memory segment */
49 __u64 size; /* size of memory segment */
50 __u32 type; /* type of memory segment */
51} __attribute__((packed));
52
53struct e820map {
54 __u32 nr_map;
55 struct e820entry map[E820_X_MAX];
56};
57
58#define ISA_START_ADDRESS 0xa0000
59#define ISA_END_ADDRESS 0x100000
60
61#define BIOS_BEGIN 0x000a0000
62#define BIOS_END 0x00100000
63
64#define BIOS_ROM_BASE 0xffe00000
65#define BIOS_ROM_END 0xffffffff
66
67#endif /* __ASSEMBLY__ */
68
69
70#endif /* _UAPI_ASM_X86_E820_H */
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