LXR linux/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#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>
  58struct 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
  64struct 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