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Rev | Author | Line No. | Line |
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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 | } |