include/asm-x86/e820.h

   1 #ifndef __ASM_E820_H
   2 #define __ASM_E820_H
   3 #define E820MAP 0x2d0           /* our map */
   4 #define E820MAX 128             /* number of entries in E820MAP */
   5
   6 /*
   7  * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the
   8  * constrained space in the zeropage.  If we have more nodes than
   9  * that, and if we've booted off EFI firmware, then the EFI tables
  10  * passed us from the EFI firmware can list more nodes.  Size our
  11  * internal memory map tables to have room for these additional
  12  * nodes, based on up to three entries per node for which the
  13  * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT),
  14  * plus E820MAX, allowing space for the possible duplicate E820
  15  * entries that might need room in the same arrays, prior to the
  16  * call to sanitize_e820_map() to remove duplicates.  The allowance
  17  * of three memory map entries per node is "enough" entries for
  18  * the initial hardware platform motivating this mechanism to make
  19  * use of additional EFI map entries.  Future platforms may want
  20  * to allow more than three entries per node or otherwise refine
  21  * this size.
  22  */
  23
  24 /*
  25  * Odd: 'make headers_check' complains about numa.h if I try
  26  * to collapse the next two #ifdef lines to a single line:
  27  *      #if defined(__KERNEL__) && defined(CONFIG_EFI)
  28  */
  29 #ifdef __KERNEL__
  30 #ifdef CONFIG_EFI
  31 #include <linux/numa.h>
  32 #define E820_X_MAX (E820MAX + 3 * MAX_NUMNODES)
  33 #else   /* ! CONFIG_EFI */
  34 #define E820_X_MAX E820MAX
  35 #endif
  36 #else   /* ! __KERNEL__ */
  37 #define E820_X_MAX E820MAX
  38 #endif
  39
  40 #define E820NR  0x1e8           /* # entries in E820MAP */
  41
  42 #define E820_RAM        1
  43 #define E820_RESERVED   2
  44 #define E820_ACPI       3
  45 #define E820_NVS        4
  46
  47 #ifndef __ASSEMBLY__
  48 struct e820entry {
  49         __u64 addr;     /* start of memory segment */
  50         __u64 size;     /* size of memory segment */
  51         __u32 type;     /* type of memory segment */
  52 } __attribute__((packed));
  53
  54 struct e820map {
  55         __u32 nr_map;
  56         struct e820entry map[E820_X_MAX];
  57 };
  58
  59 extern struct e820map e820;
  60
  61 extern int e820_any_mapped(u64 start, u64 end, unsigned type);
  62 extern int e820_all_mapped(u64 start, u64 end, unsigned type);
  63 extern void add_memory_region(u64 start, u64 size, int type);
  64 extern void e820_print_map(char *who);
  65 extern int
  66 sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, int *pnr_map);
  67 extern int copy_e820_map(struct e820entry *biosmap, int nr_map);
  68 extern u64 update_memory_range(u64 start, u64 size, unsigned old_type,
  69                                unsigned new_type);
  70 extern void update_e820(void);
  71 extern void e820_setup_gap(void);
  72
  73 extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
  74 extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
  75 extern void reserve_early(u64 start, u64 end, char *name);
  76 extern void free_early(u64 start, u64 end);
  77 extern void early_res_to_bootmem(u64 start, u64 end);
  78
  79 #endif /* __ASSEMBLY__ */
  80
  81 #define ISA_START_ADDRESS       0xa0000
  82 #define ISA_END_ADDRESS         0x100000
  83
  84 #define BIOS_BEGIN              0x000a0000
  85 #define BIOS_END                0x00100000
  86
  87 #ifdef __KERNEL__
  88 #ifdef CONFIG_X86_32
  89 # include "e820_32.h"
  90 #else
  91 # include "e820_64.h"
  92 #endif
  93 #endif /* __KERNEL__ */
  94
  95 #endif  /* __ASM_E820_H */