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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, int *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
e820_mark_nosave_regions(unsigned long limit_pfn)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
early_memtest(unsigned long start,unsigned long end)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