Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * structures and definitions for the int 15, ax=e820 memory map | |
3 | * scheme. | |
4 | * | |
5 | * In a nutshell, arch/i386/boot/setup.S populates a scratch table | |
6 | * in the empty_zero_block that contains a list of usable address/size | |
7 | * duples. In arch/i386/kernel/setup.c, this information is | |
8 | * transferred into the e820map, and in arch/i386/mm/init.c, that | |
9 | * new information is used to mark pages reserved or not. | |
10 | * | |
11 | */ | |
12 | #ifndef __E820_HEADER | |
13 | #define __E820_HEADER | |
14 | ||
15 | #define E820MAP 0x2d0 /* our map */ | |
f9ba7053 | 16 | #define E820MAX 128 /* number of entries in E820MAP */ |
1da177e4 LT |
17 | #define E820NR 0x1e8 /* # entries in E820MAP */ |
18 | ||
19 | #define E820_RAM 1 | |
20 | #define E820_RESERVED 2 | |
21 | #define E820_ACPI 3 /* usable as RAM once ACPI tables have been read */ | |
22 | #define E820_NVS 4 | |
23 | ||
24 | #define HIGH_MEMORY (1024*1024) | |
25 | ||
26 | #ifndef __ASSEMBLY__ | |
27 | ||
28 | struct e820map { | |
29 | int nr_map; | |
30 | struct e820entry { | |
31 | unsigned long long addr; /* start of memory segment */ | |
32 | unsigned long long size; /* size of memory segment */ | |
33 | unsigned long type; /* type of memory segment */ | |
34 | } map[E820MAX]; | |
35 | }; | |
36 | ||
37 | extern struct e820map e820; | |
38 | #endif/*!__ASSEMBLY__*/ | |
39 | ||
40 | #endif/*__E820_HEADER*/ |