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H. Peter Anvin1965aae2008-10-22 22:26:29 -07001#ifndef _ASM_X86_E820_H
2#define _ASM_X86_E820_H
Rusty Russellee8e7cf2007-10-22 10:56:19 +10003#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
Cihula, Joseph671eef82008-08-20 16:43:07 -070046#define E820_UNUSABLE 5
Rusty Russellee8e7cf2007-10-22 10:56:19 +100047
Shane Wang4bd96a72010-03-10 14:36:10 +080048/*
49 * reserved RAM used by kernel itself
50 * if CONFIG_INTEL_TXT is enabled, memory of this type will be
51 * included in the S3 integrity calculation and so should not include
52 * any memory that BIOS might alter over the S3 transition
53 */
Yinghai Lu28bb2232008-06-30 16:20:54 -070054#define E820_RESERVED_KERN 128
55
Rusty Russellee8e7cf2007-10-22 10:56:19 +100056#ifndef __ASSEMBLY__
Jaswinder Singh Rajput999721c2009-01-30 22:44:58 +053057#include <linux/types.h>
Rusty Russellee8e7cf2007-10-22 10:56:19 +100058struct e820entry {
59 __u64 addr; /* start of memory segment */
60 __u64 size; /* size of memory segment */
61 __u32 type; /* type of memory segment */
62} __attribute__((packed));
63
64struct e820map {
65 __u32 nr_map;
Paul Jackson028b7852008-05-14 08:15:40 -070066 struct e820entry map[E820_X_MAX];
Rusty Russellee8e7cf2007-10-22 10:56:19 +100067};
Yinghai Lub79cd8f2008-05-11 00:30:15 -070068
H. Peter Anvin65f116f2009-11-23 14:44:39 -080069#define ISA_START_ADDRESS 0xa0000
70#define ISA_END_ADDRESS 0x100000
71
72#define BIOS_BEGIN 0x000a0000
73#define BIOS_END 0x00100000
74
Bjorn Helgaasa2c606d2010-12-16 10:39:02 -070075#define BIOS_ROM_BASE 0xffe00000
76#define BIOS_ROM_END 0xffffffff
77
Rusty Russell2567d712008-07-15 15:02:27 +100078#ifdef __KERNEL__
Bernhard Walle5dfcf142008-06-27 13:12:55 +020079/* see comment in arch/x86/kernel/e820.c */
Yinghai Lub79cd8f2008-05-11 00:30:15 -070080extern struct e820map e820;
Bernhard Walle5dfcf142008-06-27 13:12:55 +020081extern struct e820map e820_saved;
Yinghai Lub79cd8f2008-05-11 00:30:15 -070082
Jaswinder Singha7b75112008-07-21 22:19:29 +053083extern unsigned long pci_mem_start;
Yinghai Lub79cd8f2008-05-11 00:30:15 -070084extern int e820_any_mapped(u64 start, u64 end, unsigned type);
85extern int e820_all_mapped(u64 start, u64 end, unsigned type);
Yinghai Lud0be6bd2008-06-15 18:58:51 -070086extern void e820_add_region(u64 start, u64 size, int type);
Yinghai Lub79cd8f2008-05-11 00:30:15 -070087extern void e820_print_map(char *who);
Paul Jacksonc3965bd2008-05-14 08:15:34 -070088extern int
Jaswinder Singh Rajputba639032009-03-23 02:13:01 +053089sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map);
Yinghai Lud0be6bd2008-06-15 18:58:51 -070090extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
Yinghai Lub79cd8f2008-05-11 00:30:15 -070091 unsigned new_type);
Yinghai Lu7a1fd982008-06-21 14:48:05 -070092extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
93 int checktype);
Yinghai Lub79cd8f2008-05-11 00:30:15 -070094extern void update_e820(void);
95extern void e820_setup_gap(void);
Alok Kataria33819592008-06-24 11:48:30 -070096extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
Alok Katariafd6493e2008-06-25 11:02:42 -070097 unsigned long start_addr, unsigned long long end_addr);
Huang, Ying8c5beb52008-06-11 11:33:39 +080098struct setup_data;
Sebastian Andrzej Siewiorf1c2b352011-02-22 21:07:36 +010099extern void parse_e820_ext(struct setup_data *data);
Yinghai Lub79cd8f2008-05-11 00:30:15 -0700100
Yinghai Lubf62f392008-05-20 20:10:58 -0700101#if defined(CONFIG_X86_64) || \
102 (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
103extern void e820_mark_nosave_regions(unsigned long limit_pfn);
104#else
105static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
106{
107}
108#endif
109
Yinghai Lu1f067162008-07-15 00:02:28 -0700110#ifdef CONFIG_MEMTEST
111extern void early_memtest(unsigned long start, unsigned long end);
112#else
113static inline void early_memtest(unsigned long start, unsigned long end)
114{
115}
116#endif
117
Yinghai Luf361a452008-07-10 20:38:26 -0700118extern unsigned long e820_end_of_ram_pfn(void);
119extern unsigned long e820_end_of_low_ram_pfn(void);
Yinghai Lu72d7c3b2010-08-25 13:39:17 -0700120extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
121
122void memblock_x86_fill(void);
Yinghai Lu6f2a7532010-08-25 13:39:18 -0700123void memblock_find_dma_reserve(void);
124
Yinghai Luab4a4652008-06-10 12:55:54 -0700125extern void finish_e820_parsing(void);
Yinghai Lu41c094f2008-06-16 13:03:31 -0700126extern void e820_reserve_resources(void);
Yinghai Lu58f7c982008-08-28 13:52:25 -0700127extern void e820_reserve_resources_late(void);
Yinghai Lu064d25f2008-06-16 19:58:28 -0700128extern void setup_memory_map(void);
Yinghai Lu95a71a42008-06-18 17:27:08 -0700129extern char *default_machine_specific_memory_setup(void);
H. Peter Anvin65f116f2009-11-23 14:44:39 -0800130
H. Peter Anvinccef0862009-11-30 21:33:51 -0800131/*
132 * Returns true iff the specified range [s,e) is completely contained inside
133 * the ISA region.
134 */
H. Peter Anvin65f116f2009-11-23 14:44:39 -0800135static inline bool is_ISA_range(u64 s, u64 e)
136{
H. Peter Anvinccef0862009-11-30 21:33:51 -0800137 return s >= ISA_START_ADDRESS && e <= ISA_END_ADDRESS;
H. Peter Anvin65f116f2009-11-23 14:44:39 -0800138}
139
Rusty Russell2567d712008-07-15 15:02:27 +1000140#endif /* __KERNEL__ */
Rusty Russellee8e7cf2007-10-22 10:56:19 +1000141#endif /* __ASSEMBLY__ */
142
143#ifdef __KERNEL__
Yinghai Lu064d25f2008-06-16 19:58:28 -0700144#include <linux/ioport.h>
145
Yinghai Lu064d25f2008-06-16 19:58:28 -0700146#define HIGH_MEMORY (1024*1024)
Rusty Russellee8e7cf2007-10-22 10:56:19 +1000147#endif /* __KERNEL__ */
148
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700149#endif /* _ASM_X86_E820_H */