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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / effcf067df5f986b8f9a2ca5101c74495be700ab / . / arch / x86 / include / asm / e820.h
blob: d155ce9ceeb02303014f1cf962351cf5e2eb6759 [file] [log] [blame]
Graeme Russ95ffaba2010-04-24 00:05:49 +1000[diff] [blame]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>
53struct 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
59struct e820map {
60 __u32 nr_map;
61 struct e820entry map[E820_X_MAX];
62};
63
64#define ISA_START_ADDRESS 0xa0000
65#define ISA_END_ADDRESS 0x100000
66
67#define BIOS_BEGIN 0x000a0000
68#define BIOS_END 0x00100000
69
70#ifdef __KERNEL__
71/* see comment in arch/x86/kernel/e820.c */
72extern struct e820map e820;
73extern struct e820map e820_saved;
74
75extern unsigned long pci_mem_start;
76extern int e820_any_mapped(u64 start, u64 end, unsigned type);
77extern int e820_all_mapped(u64 start, u64 end, unsigned type);
78extern void e820_add_region(u64 start, u64 size, int type);
79extern void e820_print_map(char *who);
80extern int
81sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map);
82extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
83 unsigned new_type);
84extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
85 int checktype);
86extern void update_e820(void);
87extern void e820_setup_gap(void);
88extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
89 unsigned long start_addr, unsigned long long end_addr);
90struct setup_data;
91extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data);
92
93#if defined(CONFIG_X86_64) || \
94 (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
95extern void e820_mark_nosave_regions(unsigned long limit_pfn);
96#else
97static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
98{
99}
100#endif
101
102#ifdef CONFIG_MEMTEST
103extern void early_memtest(unsigned long start, unsigned long end);
104#else
105static inline void early_memtest(unsigned long start, unsigned long end)
106{
107}
108#endif
109
110extern unsigned long end_user_pfn;
111
112extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
113extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
114extern void reserve_early(u64 start, u64 end, char *name);
115extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
116extern void free_early(u64 start, u64 end);
117extern void early_res_to_bootmem(u64 start, u64 end);
118extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
119
120extern unsigned long e820_end_of_ram_pfn(void);
121extern unsigned long e820_end_of_low_ram_pfn(void);
122extern int e820_find_active_region(const struct e820entry *ei,
123 unsigned long start_pfn,
124 unsigned long last_pfn,
125 unsigned long *ei_startpfn,
126 unsigned long *ei_endpfn);
127extern void e820_register_active_regions(int nid, unsigned long start_pfn,
128 unsigned long end_pfn);
129extern u64 e820_hole_size(u64 start, u64 end);
130extern void finish_e820_parsing(void);
131extern void e820_reserve_resources(void);
132extern void e820_reserve_resources_late(void);
133extern void setup_memory_map(void);
134extern char *default_machine_specific_memory_setup(void);
135
136/*
137 * Returns true iff the specified range [s,e) is completely contained inside
138 * the ISA region.
139 */
140/*
141static inline bool is_ISA_range(u64 s, u64 e)
142{
143 return s >= ISA_START_ADDRESS && e <= ISA_END_ADDRESS;
144}
145*/
146#endif /* __KERNEL__ */
147#endif /* __ASSEMBLY__ */
148
149#ifdef __KERNEL__
150/* #include <linux/ioport.h> */
151
152#define HIGH_MEMORY (1024*1024)
153#endif /* __KERNEL__ */
154
155#endif /* _ASM_X86_E820_H */