mirror of https://gitee.com/openkylin/linux.git
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/*
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* structures and definitions for the int 15, ax=e820 memory map
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* scheme.
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*
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* In a nutshell, arch/i386/boot/setup.S populates a scratch table
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* in the empty_zero_block that contains a list of usable address/size
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* duples. In arch/i386/kernel/setup.c, this information is
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* transferred into the e820map, and in arch/i386/mm/init.c, that
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* new information is used to mark pages reserved or not.
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*
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*/
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#ifndef __E820_HEADER
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#define __E820_HEADER
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#define E820MAP 0x2d0 /* our map */
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#define E820MAX 128 /* number of entries in E820MAP */
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#define E820NR 0x1e8 /* # entries in E820MAP */
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#define E820_RAM 1
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#define E820_RESERVED 2
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#define E820_ACPI 3 /* usable as RAM once ACPI tables have been read */
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#define E820_NVS 4
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#define HIGH_MEMORY (1024*1024)
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#ifndef __ASSEMBLY__
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struct e820map {
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int nr_map;
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struct e820entry {
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unsigned long long addr; /* start of memory segment */
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unsigned long long size; /* size of memory segment */
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unsigned long type; /* type of memory segment */
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} map[E820MAX];
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};
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extern struct e820map e820;
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extern int e820_all_mapped(unsigned long start, unsigned long end,
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unsigned type);
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#endif/*!__ASSEMBLY__*/
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#endif/*__E820_HEADER*/
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