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