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
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 * This is a non-standardized way to represent ADR or NVDIMM regions that
38 * persist over a reboot.  The kernel will ignore their special capabilities
39 * unless the CONFIG_X86_PMEM_LEGACY=y option is set.
40 *
41 * ( Note that older platforms also used 6 for the same type of memory,
42 *   but newer versions switched to 12 as 6 was assigned differently.  Some
43 *   time they will learn... )
44 */
45#define E820_PRAM	12
46
47/*
48 * reserved RAM used by kernel itself
49 * if CONFIG_INTEL_TXT is enabled, memory of this type will be
50 * included in the S3 integrity calculation and so should not include
51 * any memory that BIOS might alter over the S3 transition
52 */
53#define E820_RESERVED_KERN        128
54
55#ifndef __ASSEMBLY__
56#include <linux/types.h>
57struct e820entry {
58	__u64 addr;	/* start of memory segment */
59	__u64 size;	/* size of memory segment */
60	__u32 type;	/* type of memory segment */
61} __attribute__((packed));
62
63struct e820map {
64	__u32 nr_map;
65	struct e820entry map[E820_X_MAX];
66};
67
68#define ISA_START_ADDRESS	0xa0000
69#define ISA_END_ADDRESS		0x100000
70
71#define BIOS_BEGIN		0x000a0000
72#define BIOS_END		0x00100000
73
74#define BIOS_ROM_BASE		0xffe00000
75#define BIOS_ROM_END		0xffffffff
76
77#endif /* __ASSEMBLY__ */
78
79
80#endif /* _UAPI_ASM_X86_E820_H */
81