| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /** |
| 2 | * machine_specific_memory_setup - Hook for machine specific memory setup. |
| 3 | * |
| 4 | * Description: |
| 5 | * This is included late in kernel/setup.c so that it can make |
| 6 | * use of all of the static functions. |
| 7 | **/ |
| 8 | |
| 9 | static char * __init machine_specific_memory_setup(void) |
| 10 | { |
| 11 | char *who; |
| 12 | |
| 13 | |
| 14 | who = "BIOS-e820"; |
| 15 | |
| 16 | /* |
| 17 | * Try to copy the BIOS-supplied E820-map. |
| 18 | * |
| 19 | * Otherwise fake a memory map; one section from 0k->640k, |
| 20 | * the next section from 1mb->appropriate_mem_k |
| 21 | */ |
| 22 | sanitize_e820_map(E820_MAP, &E820_MAP_NR); |
| 23 | if (copy_e820_map(E820_MAP, E820_MAP_NR) < 0) { |
| 24 | unsigned long mem_size; |
| 25 | |
| 26 | /* compare results from other methods and take the greater */ |
| 27 | if (ALT_MEM_K < EXT_MEM_K) { |
| 28 | mem_size = EXT_MEM_K; |
| 29 | who = "BIOS-88"; |
| 30 | } else { |
| 31 | mem_size = ALT_MEM_K; |
| 32 | who = "BIOS-e801"; |
| 33 | } |
| 34 | |
| 35 | e820.nr_map = 0; |
| 36 | add_memory_region(0, LOWMEMSIZE(), E820_RAM); |
| 37 | add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM); |
| 38 | } |
| 39 | return who; |
| 40 | } |