Line data Source code
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 : #define ISA_START_ADDRESS 0xa0000
65 : #define ISA_END_ADDRESS 0x100000
66 :
67 : #define BIOS_BEGIN 0x000a0000
68 : #define BIOS_END 0x00100000
69 :
70 : #ifdef __KERNEL__
71 : /* see comment in arch/x86/kernel/e820.c */
72 : extern struct e820map e820;
73 : extern struct e820map e820_saved;
74 :
75 : extern unsigned long pci_mem_start;
76 : extern int e820_any_mapped(u64 start, u64 end, unsigned type);
77 : extern int e820_all_mapped(u64 start, u64 end, unsigned type);
78 : extern void e820_add_region(u64 start, u64 size, int type);
79 : extern void e820_print_map(char *who);
80 : extern int
81 : sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map);
82 : extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
83 : unsigned new_type);
84 : extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
85 : int checktype);
86 : extern void update_e820(void);
87 : extern void e820_setup_gap(void);
88 : extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
89 : unsigned long start_addr, unsigned long long end_addr);
90 : struct setup_data;
91 : extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data);
92 :
93 : #if defined(CONFIG_X86_64) || \
94 : (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
95 : extern void e820_mark_nosave_regions(unsigned long limit_pfn);
96 : #else
97 : static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
98 : {
99 : }
100 : #endif
101 :
102 : #ifdef CONFIG_MEMTEST
103 : extern void early_memtest(unsigned long start, unsigned long end);
104 : #else
105 : static inline void early_memtest(unsigned long start, unsigned long end)
106 : {
107 : }
108 : #endif
109 :
110 : extern unsigned long end_user_pfn;
111 :
112 : extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
113 : extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
114 : extern void reserve_early(u64 start, u64 end, char *name);
115 : extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
116 : extern void free_early(u64 start, u64 end);
117 : extern void early_res_to_bootmem(u64 start, u64 end);
118 : extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
119 :
120 : extern unsigned long e820_end_of_ram_pfn(void);
121 : extern unsigned long e820_end_of_low_ram_pfn(void);
122 : extern int e820_find_active_region(const struct e820entry *ei,
123 : unsigned long start_pfn,
124 : unsigned long last_pfn,
125 : unsigned long *ei_startpfn,
126 : unsigned long *ei_endpfn);
127 : extern void e820_register_active_regions(int nid, unsigned long start_pfn,
128 : unsigned long end_pfn);
129 : extern u64 e820_hole_size(u64 start, u64 end);
130 : extern void finish_e820_parsing(void);
131 : extern void e820_reserve_resources(void);
132 : extern void e820_reserve_resources_late(void);
133 : extern void setup_memory_map(void);
134 : extern char *default_machine_specific_memory_setup(void);
135 :
136 : /*
137 : * Returns true iff the specified range [s,e) is completely contained inside
138 : * the ISA region.
139 : */
140 : static inline bool is_ISA_range(u64 s, u64 e)
141 : {
142 : return s >= ISA_START_ADDRESS && e <= ISA_END_ADDRESS;
143 : }
144 1 :
145 : #endif /* __KERNEL__ */
146 : #endif /* __ASSEMBLY__ */
147 :
148 : #ifdef __KERNEL__
149 : #include <linux/ioport.h>
150 :
151 : #define HIGH_MEMORY (1024*1024)
152 : #endif /* __KERNEL__ */
153 :
154 : #endif /* _ASM_X86_E820_H */
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