include/asm-i386/e820.h

   1 /*
   2  * structures and definitions for the int 15, ax=e820 memory map
   3  * scheme.
   4  *
   5  * In a nutshell, arch/i386/boot/setup.S populates a scratch table
   6  * in the empty_zero_block that contains a list of usable address/size
   7  * duples.   In arch/i386/kernel/setup.c, this information is
   8  * transferred into the e820map, and in arch/i386/mm/init.c, that
   9  * new information is used to mark pages reserved or not.
  10  *
  11  */
  12 #ifndef __E820_HEADER
  13 #define __E820_HEADER
  14
  15 #define E820MAP 0x2d0           /* our map */
  16 #define E820MAX 128             /* number of entries in E820MAP */
  17 #define E820NR  0x1e8           /* # entries in E820MAP */
  18
  19 #define E820_RAM        1
  20 #define E820_RESERVED   2
  21 #define E820_ACPI       3
  22 #define E820_NVS        4
  23
  24 #define HIGH_MEMORY     (1024*1024)
  25
  26 #ifndef __ASSEMBLY__
  27
  28 struct e820entry {
  29         u64 addr;       /* start of memory segment */
  30         u64 size;       /* size of memory segment */
  31         u32 type;       /* type of memory segment */
  32 } __attribute__((packed));
  33
  34 struct e820map {
  35         u32 nr_map;
  36         struct e820entry map[E820MAX];
  37 };
  38
  39 extern struct e820map e820;
  40
  41 extern int e820_all_mapped(unsigned long start, unsigned long end,
  42                            unsigned type);
  43 extern int e820_any_mapped(u64 start, u64 end, unsigned type);
  44 extern void find_max_pfn(void);
  45 extern void register_bootmem_low_pages(unsigned long max_low_pfn);
  46 extern void e820_register_memory(void);
  47 extern void limit_regions(unsigned long long size);
  48 extern void print_memory_map(char *who);
  49
  50 #if defined(CONFIG_PM) && defined(CONFIG_SOFTWARE_SUSPEND)
  51 extern void e820_mark_nosave_regions(void);
  52 #else
  53 static inline void e820_mark_nosave_regions(void)
  54 {
  55 }
  56 #endif
  57
  58 #endif/*!__ASSEMBLY__*/
  59
  60 #endif/*__E820_HEADER*/