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  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. #ifndef __KERNEL__
  25. #define E820_X_MAX E820MAX
  26. #endif
  27.  
  28. #define E820NR  0x1e8           /* # entries in E820MAP */
  29.  
  30. #define E820_RAM        1
  31. #define E820_RESERVED   2
  32. #define E820_ACPI       3
  33. #define E820_NVS        4
  34. #define E820_UNUSABLE   5
  35. #define E820_PMEM       7
  36.  
  37. /*
  38.  * This is a non-standardized way to represent ADR or NVDIMM regions that
  39.  * persist over a reboot.  The kernel will ignore their special capabilities
  40.  * unless the CONFIG_X86_PMEM_LEGACY option is set.
  41.  *
  42.  * ( Note that older platforms also used 6 for the same type of memory,
  43.  *   but newer versions switched to 12 as 6 was assigned differently.  Some
  44.  *   time they will learn... )
  45.  */
  46. #define E820_PRAM       12
  47.  
  48. /*
  49.  * reserved RAM used by kernel itself
  50.  * if CONFIG_INTEL_TXT is enabled, memory of this type will be
  51.  * included in the S3 integrity calculation and so should not include
  52.  * any memory that BIOS might alter over the S3 transition
  53.  */
  54. #define E820_RESERVED_KERN        128
  55.  
  56. #ifndef __ASSEMBLY__
  57. #include <linux/types.h>
  58. struct e820entry {
  59.         __u64 addr;     /* start of memory segment */
  60.         __u64 size;     /* size of memory segment */
  61.         __u32 type;     /* type of memory segment */
  62. } __attribute__((packed));
  63.  
  64. struct e820map {
  65.         __u32 nr_map;
  66.         struct e820entry map[E820_X_MAX];
  67. };
  68.  
  69. #define ISA_START_ADDRESS       0xa0000
  70. #define ISA_END_ADDRESS         0x100000
  71.  
  72. #define BIOS_BEGIN              0x000a0000
  73. #define BIOS_END                0x00100000
  74.  
  75. #define BIOS_ROM_BASE           0xffe00000
  76. #define BIOS_ROM_END            0xffffffff
  77.  
  78. #endif /* __ASSEMBLY__ */
  79.  
  80.  
  81. #endif /* _UAPI_ASM_X86_E820_H */
  82.