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__
52 #include <linux/types.h>
53 struct e820entry {
54 __u64 addr; /* start of memory segment */
55 __u64 size; /* size of memory segment */
56 __u32 type; /* type of memory segment */
57 } __attribute__((packed));
58
59 struct e820map {
60 __u32 nr_map;
61 struct e820entry map[E820_X_MAX];
62 };
63
64 #ifdef __KERNEL__
65 /* see comment in arch/x86/kernel/e820.c */
66 extern struct e820map e820;
67 extern struct e820map e820_saved;
68
69 extern unsigned long pci_mem_start;
70 extern int e820_any_mapped(u64 start, u64 end, unsigned type);
71 extern int e820_all_mapped(u64 start, u64 end, unsigned type);
72 extern void e820_add_region(u64 start, u64 size, int type);
73 extern void e820_print_map(char *who);
74 extern int
75 sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map);
76 extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
77 unsigned new_type);
78 extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
79 int checktype);
80 extern void update_e820(void);
81 extern void e820_setup_gap(void);
82 extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
83 unsigned long start_addr, unsigned long long end_addr);
84 struct setup_data;
85 extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data);
86
87 #if defined(CONFIG_X86_64) || \
88 (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
89 extern void e820_mark_nosave_regions(unsigned long limit_pfn);
90 #else
91 static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
92 {
93 }
94 #endif
95
96 #ifdef CONFIG_MEMTEST
97 extern void early_memtest(unsigned long start, unsigned long end);
98 #else
99 static inline void early_memtest(unsigned long start, unsigned long end)
100 {
101 }
102 #endif
103
104 extern unsigned long end_user_pfn;
105
106 extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
107 extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
108 extern void reserve_early(u64 start, u64 end, char *name);
109 extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
110 extern void free_early(u64 start, u64 end);
111 extern void early_res_to_bootmem(u64 start, u64 end);
112 extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
113
114 extern unsigned long e820_end_of_ram_pfn(void);
115 extern unsigned long e820_end_of_low_ram_pfn(void);
116 extern int e820_find_active_region(const struct e820entry *ei,
117 unsigned long start_pfn,
118 unsigned long last_pfn,
119 unsigned long *ei_startpfn,
120 unsigned long *ei_endpfn);
121 extern void e820_register_active_regions(int nid, unsigned long start_pfn,
122 unsigned long end_pfn);
123 extern u64 e820_hole_size(u64 start, u64 end);
124 extern void finish_e820_parsing(void);
125 extern void e820_reserve_resources(void);
126 extern void e820_reserve_resources_late(void);
127 extern void setup_memory_map(void);
128 extern char *default_machine_specific_memory_setup(void);
129 extern char *machine_specific_memory_setup(void);
130 extern char *memory_setup(void);
131 #endif /* __KERNEL__ */
132 #endif /* __ASSEMBLY__ */
133
134 #define ISA_START_ADDRESS 0xa0000
135 #define ISA_END_ADDRESS 0x100000
136 #define is_ISA_range(s, e) ((s) >= ISA_START_ADDRESS && (e) < ISA_END_ADDRESS)
137
138 #define BIOS_BEGIN 0x000a0000
139 #define BIOS_END 0x00100000
140
141 #ifdef __KERNEL__
142 #include <linux/ioport.h>
143
144 #define HIGH_MEMORY (1024*1024)
145 #endif /* __KERNEL__ */
146
147 #endif /* _ASM_X86_E820_H */
148
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