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-rw-r--r--arch/x86/include/asm/e820.h146
1 files changed, 146 insertions, 0 deletions
diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h
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index 000000000000..5abbdec06bd2
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+++ b/arch/x86/include/asm/e820.h
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1#ifndef ASM_X86__E820_H
2#define 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/*
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
40#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#define E820_UNUSABLE 5
47
48/* reserved RAM used by kernel itself */
49#define E820_RESERVED_KERN 128
50
51#ifndef __ASSEMBLY__
52struct e820entry {
53 __u64 addr; /* start of memory segment */
54 __u64 size; /* size of memory segment */
55 __u32 type; /* type of memory segment */
56} __attribute__((packed));
57
58struct e820map {
59 __u32 nr_map;
60 struct e820entry map[E820_X_MAX];
61};
62
63#ifdef __KERNEL__
64/* see comment in arch/x86/kernel/e820.c */
65extern struct e820map e820;
66extern struct e820map e820_saved;
67
68extern unsigned long pci_mem_start;
69extern int e820_any_mapped(u64 start, u64 end, unsigned type);
70extern int e820_all_mapped(u64 start, u64 end, unsigned type);
71extern void e820_add_region(u64 start, u64 size, int type);
72extern void e820_print_map(char *who);
73extern int
74sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, int *pnr_map);
75extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
76 unsigned new_type);
77extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
78 int checktype);
79extern void update_e820(void);
80extern void e820_setup_gap(void);
81extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
82 unsigned long start_addr, unsigned long long end_addr);
83struct setup_data;
84extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data);
85
86#if defined(CONFIG_X86_64) || \
87 (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
88extern void e820_mark_nosave_regions(unsigned long limit_pfn);
89#else
90static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
91{
92}
93#endif
94
95#ifdef CONFIG_MEMTEST
96extern void early_memtest(unsigned long start, unsigned long end);
97#else
98static inline void early_memtest(unsigned long start, unsigned long end)
99{
100}
101#endif
102
103extern unsigned long end_user_pfn;
104
105extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
106extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
107extern void reserve_early(u64 start, u64 end, char *name);
108extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
109extern void free_early(u64 start, u64 end);
110extern void early_res_to_bootmem(u64 start, u64 end);
111extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
112
113extern unsigned long e820_end_of_ram_pfn(void);
114extern unsigned long e820_end_of_low_ram_pfn(void);
115extern int e820_find_active_region(const struct e820entry *ei,
116 unsigned long start_pfn,
117 unsigned long last_pfn,
118 unsigned long *ei_startpfn,
119 unsigned long *ei_endpfn);
120extern void e820_register_active_regions(int nid, unsigned long start_pfn,
121 unsigned long end_pfn);
122extern u64 e820_hole_size(u64 start, u64 end);
123extern void finish_e820_parsing(void);
124extern void e820_reserve_resources(void);
125extern void e820_reserve_resources_late(void);
126extern void setup_memory_map(void);
127extern char *default_machine_specific_memory_setup(void);
128extern char *machine_specific_memory_setup(void);
129extern char *memory_setup(void);
130#endif /* __KERNEL__ */
131#endif /* __ASSEMBLY__ */
132
133#define ISA_START_ADDRESS 0xa0000
134#define ISA_END_ADDRESS 0x100000
135#define is_ISA_range(s, e) ((s) >= ISA_START_ADDRESS && (e) < ISA_END_ADDRESS)
136
137#define BIOS_BEGIN 0x000a0000
138#define BIOS_END 0x00100000
139
140#ifdef __KERNEL__
141#include <linux/ioport.h>
142
143#define HIGH_MEMORY (1024*1024)
144#endif /* __KERNEL__ */
145
146#endif /* ASM_X86__E820_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-05 01:48:54 -0500