3 #define E820MAP 0x2d0 /* our map */
4 #define E820MAX 128 /* number of entries in E820MAP */
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
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)
31 #include <linux/numa.h>
32 #define E820_X_MAX (E820MAX + 3 * MAX_NUMNODES)
33 #else /* ! CONFIG_EFI */
34 #define E820_X_MAX E820MAX
36 #else /* ! __KERNEL__ */
37 #define E820_X_MAX E820MAX
40 #define E820NR 0x1e8 /* # entries in E820MAP */
43 #define E820_RESERVED 2
49 __u64 addr; /* start of memory segment */
50 __u64 size; /* size of memory segment */
51 __u32 type; /* type of memory segment */
52 } __attribute__((packed));
56 struct e820entry map[E820_X_MAX];
59 extern struct e820map e820;
61 extern int e820_any_mapped(u64 start, u64 end, unsigned type);
62 extern int e820_all_mapped(u64 start, u64 end, unsigned type);
63 extern void e820_add_region(u64 start, u64 size, int type);
64 extern void e820_print_map(char *who);
66 sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, int *pnr_map);
67 extern int copy_e820_map(struct e820entry *biosmap, int nr_map);
68 extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
70 extern void update_e820(void);
71 extern void e820_setup_gap(void);
73 extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data);
75 #if defined(CONFIG_X86_64) || \
76 (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
77 extern void e820_mark_nosave_regions(unsigned long limit_pfn);
79 static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
84 extern unsigned long end_user_pfn;
86 extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
87 extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
88 extern void reserve_early(u64 start, u64 end, char *name);
89 extern void free_early(u64 start, u64 end);
90 extern void early_res_to_bootmem(u64 start, u64 end);
91 extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
93 extern unsigned long e820_end_of_ram(void);
94 extern int e820_find_active_region(const struct e820entry *ei,
95 unsigned long start_pfn,
96 unsigned long last_pfn,
97 unsigned long *ei_startpfn,
98 unsigned long *ei_endpfn);
99 extern void e820_register_active_regions(int nid, unsigned long start_pfn,
100 unsigned long end_pfn);
101 extern u64 e820_hole_size(u64 start, u64 end);
102 extern void finish_e820_parsing(void);
103 extern void e820_reserve_resources(void);
104 extern void setup_memory_map(void);
105 extern char *default_machine_specific_memory_setup(void);
106 extern char *machine_specific_memory_setup(void);
107 extern char *memory_setup(void);
109 #endif /* __ASSEMBLY__ */
111 #define ISA_START_ADDRESS 0xa0000
112 #define ISA_END_ADDRESS 0x100000
113 #define is_ISA_range(s, e) ((s) >= ISA_START_ADDRESS && (e) < ISA_END_ADDRESS)
115 #define BIOS_BEGIN 0x000a0000
116 #define BIOS_END 0x00100000
119 #include <linux/ioport.h>
121 #define HIGH_MEMORY (1024*1024)
122 #endif /* __KERNEL__ */
124 #endif /* __ASM_E820_H */