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ͨ¹ýº¯Êýmachine_specific_memory_setup()º¯ÊýÀ´½¨Á¢ÎïÀíµØÖ·Ó³Éä¡£´Ë±í¿ÉÒÔ»ñÈ¡£¬ÊÇÄÚºËÔÚbiosÁбíµÄ»ù´¡ÉϹ¹½¨µÄ£»·ñÔòÄں˰´ÕÕ±£ÊصÄȱʡÉèÖù¹½¨ÕâÕÅ±í£º´Ó0x9f£¨lowmemsize()£©µ½0x100(high_memory)ºÅµÄËùÓÐÒ³¿ò¶¼±ê¼ÇΪ±£Áô¡£setup_memoryº¯Êý¹¹¼ÜÕâÕÅ±í¡£
static unsigned long __init setup_memory(void)
{
unsigned long bootmap_size, start_pfn, max_low_pfn;
start_pfn = PFN_UP(init_pg_tables_end);
find_max_pfn();
max_low_pfn = find_max_low_pfn();
bootmap_size = init_bootmem(start_pfn, max_low_pfn);
register_bootmem_low_pages(max_low_pfn);
reserve_bootmem(HIGH_MEMORY, (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE-1) - (HIGH_MEMORY));
reserve_bootmem(0, PAGE_SIZE);´Ëº¯ÊýÓÃÀ´±£ÁôÒ³Ã棬·½·¨Êǽ«±£Áôλ±ä³É1.
reserve_ebda_region();
if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && boot_cpu_data.x86 == 6)
reserve_bootmem(0xa0000 - 4096, 4096);
return max_low_pfn;
}
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ÆäÖУ¬ul·Ö±ðÊÇbootmap_size£¨bit mapµÄsize£©,start_pfn(¿ªÊ¼µÄÒ³¿ò)£¬max_low_pfn(±»ÄÚºËÖ±½ÓÓ³ÉäµÄ×îºóÒ»¸öÒ³¿òµÄÒ³¿òºÅ) ;
#define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT);
unsigned long init_pg_tables_end __initdata = ~0UL
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#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
#define PFN_PHYS(x
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