include/asm-x86_64/e820.h

   1 /*
   2  * structures and definitions for the int 15, ax=e820 memory map
   3  * scheme.
   4  *
   5  * In a nutshell, setup.S populates a scratch table in the
   6  * empty_zero_block that contains a list of usable address/size
   7  * duples.  setup.c, this information is transferred into the e820map,
   8  * and in init.c/numa.c, that new information is used to mark pages
   9  * reserved or not.
  10  */
  11 #ifndef __E820_HEADER
  12 #define __E820_HEADER
  13
  14 #include <linux/mmzone.h>
  15
  16 #define E820MAP 0x2d0           /* our map */
  17 #define E820MAX 128             /* number of entries in E820MAP */
  18 #define E820NR  0x1e8           /* # entries in E820MAP */
  19
  20 #define E820_RAM        1
  21 #define E820_RESERVED   2
  22 #define E820_ACPI       3 /* usable as RAM once ACPI tables have been read */
  23 #define E820_NVS        4
  24
  25 #define HIGH_MEMORY     (1024*1024)
  26
  27 #define LOWMEMSIZE()    (0x9f000)
  28
  29 #ifndef __ASSEMBLY__
  30 struct e820entry {
  31         u64 addr;       /* start of memory segment */
  32         u64 size;       /* size of memory segment */
  33         u32 type;       /* type of memory segment */
  34 } __attribute__((packed));
  35
  36 struct e820map {
  37     int nr_map;
  38         struct e820entry map[E820MAX];
  39 };
  40
  41 extern unsigned long find_e820_area(unsigned long start, unsigned long end,
  42                                     unsigned size);
  43 extern void add_memory_region(unsigned long start, unsigned long size,
  44                               int type);
  45 extern void setup_memory_region(void);
  46 extern void contig_e820_setup(void);
  47 extern unsigned long e820_end_of_ram(void);
  48 extern void e820_reserve_resources(void);
  49 extern void e820_print_map(char *who);
  50 extern int e820_mapped(unsigned long start, unsigned long end, unsigned type);
  51
  52 extern void e820_bootmem_free(pg_data_t *pgdat, unsigned long start,unsigned long end);
  53 extern void e820_setup_gap(void);
  54 extern unsigned long e820_hole_size(unsigned long start_pfn,
  55                                     unsigned long end_pfn);
  56
  57 extern void __init parse_memopt(char *p, char **end);
  58 extern void __init parse_memmapopt(char *p, char **end);
  59
  60 extern struct e820map e820;
  61 #endif/*!__ASSEMBLY__*/
  62
  63 #endif/*__E820_HEADER*/