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422 giacomo 1
/*
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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 32              /* 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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#endif/*!__ASSEMBLY__*/
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#endif/*__E820_HEADER*/