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 /*
49 * reserved RAM used by kernel itself
50 * if CONFIG_INTEL_TXT is enabled, memory of this type will be
51 * included in the S3 integrity calculation and so should not include
52 * any memory that BIOS might alter over the S3 transition
53 */
54 #define E820_RESERVED_KERN 128
55
56 #ifndef __ASSEMBLY__
57 #include <linux/types.h>
58 struct e820entry {
59 __u64 addr; /* start of memory segment */
60 __u64 size; /* size of memory segment */
61 __u32 type; /* type of memory segment */
62 } __attribute__((packed));
63
64 struct e820map {
65 __u32 nr_map;
66 struct e820entry map[E820_X_MAX];
67 };
68
69 #define ISA_START_ADDRESS 0xa0000
70 #define ISA_END_ADDRESS 0x100000
71
72 #define BIOS_BEGIN 0x000a0000
73 #define BIOS_END 0x00100000
74
75 #define BIOS_ROM_BASE 0xffe00000
76 #define BIOS_ROM_END 0xffffffff
77
78 #ifdef __KERNEL__
79 /* see comment in arch/x86/kernel/e820.c */
80 extern struct e820map e820;
81 extern struct e820map e820_saved;
82
83 extern unsigned long pci_mem_start;
84 extern int e820_any_mapped(u64 start, u64 end, unsigned type);
85 extern int e820_all_mapped(u64 start, u64 end, unsigned type);
86 extern void e820_add_region(u64 start, u64 size, int type);
87 extern void e820_print_map(char *who);
88 extern int
89 sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map);
90 extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
91 unsigned new_type);
92 extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
93 int checktype);
94 extern void update_e820(void);
95 extern void e820_setup_gap(void);
96 extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
97 unsigned long start_addr, unsigned long long end_addr);
98 struct setup_data;
99 extern void parse_e820_ext(struct setup_data *data);
100
101 #if defined(CONFIG_X86_64) || \
102 (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
103 extern void e820_mark_nosave_regions(unsigned long limit_pfn);
104 #else
e820_mark_nosave_regions(unsigned long limit_pfn)105 static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
106 {
107 }
108 #endif
109
110 #ifdef CONFIG_MEMTEST
111 extern void early_memtest(unsigned long start, unsigned long end);
112 #else
early_memtest(unsigned long start,unsigned long end)113 static inline void early_memtest(unsigned long start, unsigned long end)
114 {
115 }
116 #endif
117
118 extern unsigned long e820_end_of_ram_pfn(void);
119 extern unsigned long e820_end_of_low_ram_pfn(void);
120 extern u64 early_reserve_e820(u64 sizet, u64 align);
121
122 void memblock_x86_fill(void);
123 void memblock_find_dma_reserve(void);
124
125 extern void finish_e820_parsing(void);
126 extern void e820_reserve_resources(void);
127 extern void e820_reserve_resources_late(void);
128 extern void setup_memory_map(void);
129 extern char *default_machine_specific_memory_setup(void);
130
131 /*
132 * Returns true iff the specified range [s,e) is completely contained inside
133 * the ISA region.
134 */
is_ISA_range(u64 s,u64 e)135 static inline bool is_ISA_range(u64 s, u64 e)
136 {
137 return s >= ISA_START_ADDRESS && e <= ISA_END_ADDRESS;
138 }
139
140 #endif /* __KERNEL__ */
141 #endif /* __ASSEMBLY__ */
142
143 #ifdef __KERNEL__
144 #include <linux/ioport.h>
145
146 #define HIGH_MEMORY (1024*1024)
147 #endif /* __KERNEL__ */
148
149 #endif /* _ASM_X86_E820_H */
150