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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 424 | giacomo | 1 | /** |
| 2 | * machine_specific_memory_setup - Hook for machine specific memory setup. |
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| 3 | * |
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| 4 | * Description: |
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| 5 | * This is included late in kernel/setup.c so that it can make |
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| 6 | * use of all of the static functions. |
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| 7 | **/ |
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| 8 | |||
| 9 | static inline char * __init machine_specific_memory_setup(void) |
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| 10 | { |
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| 11 | char *who; |
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| 12 | |||
| 13 | |||
| 14 | who = "BIOS-e820"; |
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| 15 | |||
| 16 | /* |
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| 17 | * Try to copy the BIOS-supplied E820-map. |
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| 18 | * |
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| 19 | * Otherwise fake a memory map; one section from 0k->640k, |
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| 20 | * the next section from 1mb->appropriate_mem_k |
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| 21 | */ |
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| 22 | sanitize_e820_map(E820_MAP, &E820_MAP_NR); |
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| 23 | if (copy_e820_map(E820_MAP, E820_MAP_NR) < 0) { |
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| 24 | unsigned long mem_size; |
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| 25 | |||
| 26 | /* compare results from other methods and take the greater */ |
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| 27 | if (ALT_MEM_K < EXT_MEM_K) { |
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| 28 | mem_size = EXT_MEM_K; |
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| 29 | who = "BIOS-88"; |
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| 30 | } else { |
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| 31 | mem_size = ALT_MEM_K; |
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| 32 | who = "BIOS-e801"; |
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| 33 | } |
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| 34 | |||
| 35 | e820.nr_map = 0; |
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| 36 | add_memory_region(0, LOWMEMSIZE(), E820_RAM); |
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| 37 | add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM); |
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| 38 | } |
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| 39 | return who; |
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| 40 | } |