arch/x86/include/uapi/asm/e820.h

   1 #ifndef _UAPI_ASM_X86_E820_H
   2 #define _UAPI_ASM_X86_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 #ifndef __KERNEL__
  30 #define E820_X_MAX E820MAX
  31 #endif
  32
  33 #define E820NR  0x1e8           /* # entries in E820MAP */
  34
  35 #define E820_RAM        1
  36 #define E820_RESERVED   2
  37 #define E820_ACPI       3
  38 #define E820_NVS        4
  39 #define E820_UNUSABLE   5
  40
  41
  42 /*
  43  * reserved RAM used by kernel itself
  44  * if CONFIG_INTEL_TXT is enabled, memory of this type will be
  45  * included in the S3 integrity calculation and so should not include
  46  * any memory that BIOS might alter over the S3 transition
  47  */
  48 #define E820_RESERVED_KERN        128
  49
  50 #ifndef __ASSEMBLY__
  51 #include <linux/types.h>
  52 struct e820entry {
  53         __u64 addr;     /* start of memory segment */
  54         __u64 size;     /* size of memory segment */
  55         __u32 type;     /* type of memory segment */
  56 } __attribute__((packed));
  57
  58 struct e820map {
  59         __u32 nr_map;
  60         struct e820entry map[E820_X_MAX];
  61 };
  62
  63 #define ISA_START_ADDRESS       0xa0000
  64 #define ISA_END_ADDRESS         0x100000
  65
  66 #define BIOS_BEGIN              0x000a0000
  67 #define BIOS_END                0x00100000
  68
  69 #define BIOS_ROM_BASE           0xffe00000
  70 #define BIOS_ROM_END            0xffffffff
  71
  72 #endif /* __ASSEMBLY__ */
  73
  74
  75 #endif /* _UAPI_ASM_X86_E820_H */