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 add_memory_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
update_memory_range(u64 start
, u64 size
, unsigned old_type
,
70 extern void update_e820(void);
71 extern void e820_setup_gap(void);
73 #if defined(CONFIG_X86_64) || \
74 (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
75 extern void e820_mark_nosave_regions(unsigned long limit_pfn
);
77 static inline void e820_mark_nosave_regions(unsigned long limit_pfn
)
82 extern unsigned long end_user_pfn
;
84 extern u64
find_e820_area(u64 start
, u64 end
, u64 size
, u64 align
);
85 extern u64
find_e820_area_size(u64 start
, u64
*sizep
, u64 align
);
86 extern void reserve_early(u64 start
, u64 end
, char *name
);
87 extern void free_early(u64 start
, u64 end
);
88 extern void early_res_to_bootmem(u64 start
, u64 end
);
89 extern int page_is_reserved_early(unsigned long pagenr
);
90 extern u64
early_reserve_e820(u64 startt
, u64 sizet
, u64 align
);
92 extern unsigned long e820_end_of_ram(void);
93 extern int e820_find_active_region(const struct e820entry
*ei
,
94 unsigned long start_pfn
,
95 unsigned long last_pfn
,
96 unsigned long *ei_startpfn
,
97 unsigned long *ei_endpfn
);
98 extern void e820_register_active_regions(int nid
, unsigned long start_pfn
,
99 unsigned long end_pfn
);
100 extern u64
e820_hole_size(u64 start
, u64 end
);
101 #endif /* __ASSEMBLY__ */
103 #define ISA_START_ADDRESS 0xa0000
104 #define ISA_END_ADDRESS 0x100000
106 #define BIOS_BEGIN 0x000a0000
107 #define BIOS_END 0x00100000
111 # include "e820_32.h"
113 # include "e820_64.h"
115 #endif /* __KERNEL__ */
117 #endif /* __ASM_E820_H */
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