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