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/*

 * structures and definitions for the int 15, ax=e820 memory map

 * scheme.

 *

 * In a nutshell, setup.S populates a scratch table in the

 * empty_zero_block that contains a list of usable address/size

 * duples.  setup.c, this information is transferred into the e820map,

 * and in init.c/numa.c, that new information is used to mark pages

 * reserved or not.

 */

#ifndef __E820_HEADER

#define __E820_HEADER

#include <linux/mmzone.h>

#define E820MAP 0x2d0           /* our map */

#define E820MAX 32              /* 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

#define HIGH_MEMORY     (1024*1024)

#define LOWMEMSIZE()    (0x9f000)

#define MAXMEM          (120UL * 1024 * 1024 * 1024 * 1024)  /* 120TB */ 

#ifndef __ASSEMBLY__

struct e820entry {

        u64 addr;       /* start of memory segment */

        u64 size;       /* size of memory segment */

        u32 type;       /* type of memory segment */

} __attribute__((packed));

struct e820map {

        int nr_map;

        struct e820entry map[E820MAX];

};

extern unsigned long find_e820_area(unsigned long start, unsigned long end,

                                    unsigned size);

extern void add_memory_region(unsigned long start, unsigned long size,

                              int type);

extern void setup_memory_region(void);

extern void contig_e820_setup(void);

extern void e820_end_of_ram(void);

extern void e820_reserve_resources(void);

extern void e820_print_map(char *who);

extern int e820_mapped(unsigned long start, unsigned long end, int type);

extern void e820_bootmem_free(pg_data_t *pgdat, unsigned long start,unsigned long end);

extern void parse_mem_cmdline (char ** cmdline_p);

extern struct e820map e820;

#endif/*!__ASSEMBLY__*/

#endif/*__E820_HEADER*/