60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
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/*
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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, setup.S populates a scratch table in the
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* empty_zero_block that contains a list of usable address/size
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* duples. setup.c, this information is transferred into the e820map,
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* and in init.c/numa.c, that new information is used to mark pages
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* reserved or not.
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*/
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#ifndef __E820_HEADER
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#define __E820_HEADER
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#include <linux/mmzone.h>
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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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#define LOWMEMSIZE() (0x9f000)
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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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int nr_map;
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struct e820entry map[E820MAX];
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};
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extern unsigned long find_e820_area(unsigned long start, unsigned long end,
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unsigned size);
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extern void add_memory_region(unsigned long start, unsigned long size,
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int type);
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extern void setup_memory_region(void);
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extern void contig_e820_setup(void);
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extern unsigned long e820_end_of_ram(void);
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extern void e820_reserve_resources(void);
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extern void e820_print_map(char *who);
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extern int e820_mapped(unsigned long start, unsigned long end, unsigned type);
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extern void e820_bootmem_free(pg_data_t *pgdat, unsigned long start,unsigned long end);
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extern void __init parse_memopt(char *p, char **end);
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extern struct e820map e820;
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#endif/*!__ASSEMBLY__*/
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#endif/*__E820_HEADER*/
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