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Rusty Russellee8e7cf2007-10-22 10:56:19 +10001#ifndef __ASM_E820_H
2#define __ASM_E820_H
3#define E820MAP 0x2d0 /* our map */
4#define E820MAX 128 /* number of entries in E820MAP */
Paul Jackson028b7852008-05-14 08:15:40 -07005
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/*
25 * Odd: 'make headers_check' complains about numa.h if I try
26 * to collapse the next two #ifdef lines to a single line:
27 * #if defined(__KERNEL__) && defined(CONFIG_EFI)
28 */
29#ifdef __KERNEL__
30#ifdef CONFIG_EFI
31#include <linux/numa.h>
32#define E820_X_MAX (E820MAX + 3 * MAX_NUMNODES)
33#else /* ! CONFIG_EFI */
34#define E820_X_MAX E820MAX
35#endif
36#else /* ! __KERNEL__ */
37#define E820_X_MAX E820MAX
38#endif
39
Rusty Russellee8e7cf2007-10-22 10:56:19 +100040#define E820NR 0x1e8 /* # entries in E820MAP */
41
42#define E820_RAM 1
43#define E820_RESERVED 2
44#define E820_ACPI 3
45#define E820_NVS 4
46
47#ifndef __ASSEMBLY__
48struct e820entry {
49 __u64 addr; /* start of memory segment */
50 __u64 size; /* size of memory segment */
51 __u32 type; /* type of memory segment */
52} __attribute__((packed));
53
54struct e820map {
55 __u32 nr_map;
Paul Jackson028b7852008-05-14 08:15:40 -070056 struct e820entry map[E820_X_MAX];
Rusty Russellee8e7cf2007-10-22 10:56:19 +100057};
Yinghai Lub79cd8f2008-05-11 00:30:15 -070058
59extern struct e820map e820;
60
61extern int e820_any_mapped(u64 start, u64 end, unsigned type);
62extern int e820_all_mapped(u64 start, u64 end, unsigned type);
Yinghai Lud0be6bd2008-06-15 18:58:51 -070063extern void e820_add_region(u64 start, u64 size, int type);
Yinghai Lub79cd8f2008-05-11 00:30:15 -070064extern void e820_print_map(char *who);
Paul Jacksonc3965bd2008-05-14 08:15:34 -070065extern int
Paul Jackson6e9bcc72008-05-14 08:15:46 -070066sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, int *pnr_map);
Yinghai Lub79cd8f2008-05-11 00:30:15 -070067extern int copy_e820_map(struct e820entry *biosmap, int nr_map);
Yinghai Lud0be6bd2008-06-15 18:58:51 -070068extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
Yinghai Lub79cd8f2008-05-11 00:30:15 -070069 unsigned new_type);
70extern void update_e820(void);
71extern void e820_setup_gap(void);
72
Yinghai Lubf62f392008-05-20 20:10:58 -070073#if defined(CONFIG_X86_64) || \
74 (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
75extern void e820_mark_nosave_regions(unsigned long limit_pfn);
76#else
77static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
78{
79}
80#endif
81
Yinghai Luee0c80f2008-06-03 19:34:00 -070082extern unsigned long end_user_pfn;
83
Yinghai Lua4c81cf2008-05-18 01:18:57 -070084extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
85extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
86extern void reserve_early(u64 start, u64 end, char *name);
87extern void free_early(u64 start, u64 end);
88extern void early_res_to_bootmem(u64 start, u64 end);
Huang, Yingd0ec2c62008-06-02 14:26:18 +080089extern int page_is_reserved_early(unsigned long pagenr);
Yinghai Lu2944e162008-06-01 13:17:38 -070090extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
Yinghai Lua4c81cf2008-05-18 01:18:57 -070091
Yinghai Luee0c80f2008-06-03 19:34:00 -070092extern unsigned long e820_end_of_ram(void);
93extern int e820_find_active_region(const struct e820entry *ei,
94 unsigned long start_pfn,
95 unsigned long last_pfn,
96 unsigned long *ei_startpfn,
97 unsigned long *ei_endpfn);
98extern void e820_register_active_regions(int nid, unsigned long start_pfn,
99 unsigned long end_pfn);
100extern u64 e820_hole_size(u64 start, u64 end);
Yinghai Luab4a4652008-06-10 12:55:54 -0700101extern void finish_e820_parsing(void);
102
Rusty Russellee8e7cf2007-10-22 10:56:19 +1000103#endif /* __ASSEMBLY__ */
104
Ingo Molnar306c1422008-01-30 13:33:08 +0100105#define ISA_START_ADDRESS 0xa0000
106#define ISA_END_ADDRESS 0x100000
107
Thomas Gleixner950f9d92008-01-30 13:34:06 +0100108#define BIOS_BEGIN 0x000a0000
109#define BIOS_END 0x00100000
110
Rusty Russellee8e7cf2007-10-22 10:56:19 +1000111#ifdef __KERNEL__
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200112#ifdef CONFIG_X86_32
113# include "e820_32.h"
114#else
115# include "e820_64.h"
116#endif
Rusty Russellee8e7cf2007-10-22 10:56:19 +1000117#endif /* __KERNEL__ */
118
119#endif /* __ASM_E820_H */