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
  23 #define E820_NVS        4
  24
  25 #ifndef __ASSEMBLY__
  26 struct e820entry {
  27         u64 addr;       /* start of memory segment */
  28         u64 size;       /* size of memory segment */
  29         u32 type;       /* type of memory segment */
  30 } __attribute__((packed));
  31
  32 struct e820map {
  33     int nr_map;
  34         struct e820entry map[E820MAX];
  35 };
  36
  37 extern unsigned long find_e820_area(unsigned long start, unsigned long end,
  38                                     unsigned size);
  39 extern void add_memory_region(unsigned long start, unsigned long size,
  40                               int type);
  41 extern void setup_memory_region(void);
  42 extern void contig_e820_setup(void);
  43 extern unsigned long e820_end_of_ram(void);
  44 extern void e820_reserve_resources(void);
  45 extern void e820_mark_nosave_regions(void);
  46 extern void e820_print_map(char *who);
  47 extern int e820_any_mapped(unsigned long start, unsigned long end, unsigned type);
  48 extern int e820_all_mapped(unsigned long start, unsigned long end, unsigned type);
  49
  50 extern void e820_setup_gap(void);
  51 extern void e820_register_active_regions(int nid,
  52                                 unsigned long start_pfn, unsigned long end_pfn);
  53
  54 extern void finish_e820_parsing(void);
  55
  56 extern struct e820map e820;
  57
  58 extern unsigned ebda_addr, ebda_size;
  59 #endif/*!__ASSEMBLY__*/
  60
  61 #endif/*__E820_HEADER*/