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   e820ÊÇBIOSµÄ£¨int 0x15£©ÖжϹØÁªµÄ¡£ÔÚʹÓôËÖжÏʱ£¬axÖбØÐëÊÇe820(ireg.ax=0xe820;)¡£Í¨¹ý´ËÖжϿÉÒԵõ½ÄÚ´æµÄϵͳ²¼¾Ö¡£Í¨¹ýdoÑ­»·£¬Ã¿´ÎµÃµ½Ò»¶Î¡£
/linux32/arch/x86/include/asm/e820.h
ºêE820_MAPÊÇstruct e820entryÊý¾Ý½á¹¹µÄÖ¸Õ룬´æ·ÅÔÚ²ÎÊý¿éÖÐÎ»ÒÆÎª0x2d0µÄµØ·½¡£
#define E820MAP 0x2d0           /* our map */
#define E820MAX 128             /* number of entries in E820MAP */
#define E820NR  0x1e8           /* # entries in E820MAP */
#define E820_RAM        1
#define E820_RESERVED   2
#define E820_ACPI       3 /* usable as RAM once ACPI tables have been read */
#define E820_NVS        4//´ËÏî±íÃ÷rom eprom flash´æ´¢Æ÷¡£
#define E820_UNUSABLE   5
#include <linux/types.h>
struct e820entry {
        __u64 addr;     /* start of memory segment */
        __u64 size;     /* size of memory segment */
        __u32 type;     /* type of memory segment */
} __attribute__((packed));
#define E820_X_MAX (E820MAX + 3 * MAX_NUMNODES)
struct e820map {
        __u32 nr_map;
        struct e820entry map[E820_X_MAX];
};
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´Ó0xf0000-0xfffffµÄ×î¸ß4k,¾ÍÊÇbiosʹÓõģ¬Ö»ÒªÓÐbios´æÔÚ£¬¾ÍÐèÒªÁ½¸öÇø¼ä¡£ÄÇônr_map¾Í²»ÄÜСÓÚ2.ÏÖÔÚ1mbµÄ±ß½çÒѾ­´òÆÆ£¬½«1mbÒÔÉϵĿռä½ÐHIGH_MEMORY¡£ÎªÁ˼æÈÝ£¬¾ÍÒª±£Áô×î³õµÄ1mb.
#define HIGH_MEMOR


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