| /** |
| * machine_specific_memory_setup - Hook for machine specific memory setup. |
| * |
| * Description: |
| * This is included late in kernel/setup.c so that it can make |
| * use of all of the static functions. |
| **/ |
| |
| static char * __init machine_specific_memory_setup(void) |
| { |
| char *who; |
| |
| |
| who = "BIOS-e820"; |
| |
| /* |
| * Try to copy the BIOS-supplied E820-map. |
| * |
| * Otherwise fake a memory map; one section from 0k->640k, |
| * the next section from 1mb->appropriate_mem_k |
| */ |
| sanitize_e820_map(E820_MAP, &E820_MAP_NR); |
| if (copy_e820_map(E820_MAP, E820_MAP_NR) < 0) { |
| unsigned long mem_size; |
| |
| /* compare results from other methods and take the greater */ |
| if (ALT_MEM_K < EXT_MEM_K) { |
| mem_size = EXT_MEM_K; |
| who = "BIOS-88"; |
| } else { |
| mem_size = ALT_MEM_K; |
| who = "BIOS-e801"; |
| } |
| |
| e820.nr_map = 0; |
| add_memory_region(0, LOWMEMSIZE(), E820_RAM); |
| add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM); |
| } |
| return who; |
| } |
