include/asm-x86/e820_64.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 #define E820MAP 0x2d0           /* our map */
  15 #define E820MAX 128             /* number of entries in E820MAP */
  16 #define E820NR  0x1e8           /* # entries in E820MAP */
  17
  18 #define E820_RAM        1
  19 #define E820_RESERVED   2
  20 #define E820_ACPI       3
  21 #define E820_NVS        4
  22
  23 #ifndef __ASSEMBLY__
  24 struct e820entry {
  25         u64 addr;       /* start of memory segment */
  26         u64 size;       /* size of memory segment */
  27         u32 type;       /* type of memory segment */
  28 } __attribute__((packed));
  29
  30 struct e820map {
  31         u32 nr_map;
  32         struct e820entry map[E820MAX];
  33 };
  34
  35 extern unsigned long find_e820_area(unsigned long start, unsigned long end,
  36                                     unsigned size);
  37 extern void add_memory_region(unsigned long start, unsigned long size,
  38                               int type);
  39 extern void setup_memory_region(void);
  40 extern void contig_e820_setup(void);
  41 extern unsigned long e820_end_of_ram(void);
  42 extern void e820_reserve_resources(void);
  43 extern void e820_mark_nosave_regions(void);
  44 extern void e820_print_map(char *who);
  45 extern int e820_any_mapped(unsigned long start, unsigned long end, unsigned type);
  46 extern int e820_all_mapped(unsigned long start, unsigned long end, unsigned type);
  47 extern unsigned long e820_hole_size(unsigned long start, unsigned long end);
  48
  49 extern void e820_setup_gap(void);
  50 extern void e820_register_active_regions(int nid,
  51                                 unsigned long start_pfn, unsigned long end_pfn);
  52
  53 extern void finish_e820_parsing(void);
  54
  55 extern struct e820map e820;
  56
  57 extern unsigned ebda_addr, ebda_size;
  58 extern unsigned long nodemap_addr, nodemap_size;
  59 #endif/*!__ASSEMBLY__*/
  60
  61 #endif/*__E820_HEADER*/