| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 */ |
| 16 | #define E820MAX 32 /* number of entries in E820MAP */ |
| 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*/ |