53 lines
1.4 KiB
C
53 lines
1.4 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
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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 e820entry {
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u64 addr; /* start of memory segment */
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u64 size; /* size of memory segment */
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u32 type; /* type of memory segment */
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} __attribute__((packed));
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struct e820map {
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u32 nr_map;
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struct e820entry 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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extern int e820_any_mapped(u64 start, u64 end, unsigned type);
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extern void find_max_pfn(void);
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extern void register_bootmem_low_pages(unsigned long max_low_pfn);
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extern void e820_register_memory(void);
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extern void limit_regions(unsigned long long size);
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extern void print_memory_map(char *who);
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#endif/*!__ASSEMBLY__*/
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#endif/*__E820_HEADER*/
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