]>
git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/x86/include/asm/e820.h
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 */
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
46 #define E820_UNUSABLE 5
48 /* reserved RAM used by kernel itself */
49 #define E820_RESERVED_KERN 128
52 #include <linux/types.h>
54 __u64 addr
; /* start of memory segment */
55 __u64 size
; /* size of memory segment */
56 __u32 type
; /* type of memory segment */
57 } __attribute__((packed
));
61 struct e820entry map
[E820_X_MAX
];
64 #define ISA_START_ADDRESS 0xa0000
65 #define ISA_END_ADDRESS 0x100000
67 #define BIOS_BEGIN 0x000a0000
68 #define BIOS_END 0x00100000
71 /* see comment in arch/x86/kernel/e820.c */
72 extern struct e820map e820
;
73 extern struct e820map e820_saved
;
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
);
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
,
84 extern u64
e820_remove_range(u64 start
, u64 size
, unsigned old_type
,
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
);
91 extern void parse_e820_ext(struct setup_data
*data
, unsigned long pa_data
);
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
);
97 static inline void e820_mark_nosave_regions(unsigned long limit_pfn
)
102 #ifdef CONFIG_MEMTEST
103 extern void early_memtest(unsigned long start
, unsigned long end
);
105 static inline void early_memtest(unsigned long start
, unsigned long end
)
110 extern unsigned long end_user_pfn
;
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
);
120 void reserve_early_without_check(u64 start
, u64 end
, char *name
);
121 u64
find_early_area(u64 ei_start
, u64 ei_last
, u64 start
, u64 end
,
122 u64 size
, u64 align
);
123 #include <linux/range.h>
124 int get_free_all_memory_range(struct range
**rangep
, int nodeid
);
126 extern unsigned long e820_end_of_ram_pfn(void);
127 extern unsigned long e820_end_of_low_ram_pfn(void);
128 extern int e820_find_active_region(const struct e820entry
*ei
,
129 unsigned long start_pfn
,
130 unsigned long last_pfn
,
131 unsigned long *ei_startpfn
,
132 unsigned long *ei_endpfn
);
133 extern void e820_register_active_regions(int nid
, unsigned long start_pfn
,
134 unsigned long end_pfn
);
135 extern u64
e820_hole_size(u64 start
, u64 end
);
136 extern void finish_e820_parsing(void);
137 extern void e820_reserve_resources(void);
138 extern void e820_reserve_resources_late(void);
139 extern void setup_memory_map(void);
140 extern char *default_machine_specific_memory_setup(void);
143 * Returns true iff the specified range [s,e) is completely contained inside
146 static inline bool is_ISA_range(u64 s
, u64 e
)
148 return s
>= ISA_START_ADDRESS
&& e
<= ISA_END_ADDRESS
;
151 #endif /* __KERNEL__ */
152 #endif /* __ASSEMBLY__ */
155 #include <linux/ioport.h>
157 #define HIGH_MEMORY (1024*1024)
158 #endif /* __KERNEL__ */
160 #endif /* _ASM_X86_E820_H */