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/**
 * 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 inline 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;
}