linux/arch/x86/include/asm/e820.h
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   1#ifndef _ASM_X86_E820_H
   2#define _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#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#define E820_UNUSABLE   5
  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#ifdef __KERNEL__
  79/* see comment in arch/x86/kernel/e820.c */
  80extern struct e820map e820;
  81extern struct e820map e820_saved;
  82
  83extern unsigned long pci_mem_start;
  84extern int e820_any_mapped(u64 start, u64 end, unsigned type);
  85extern int e820_all_mapped(u64 start, u64 end, unsigned type);
  86extern void e820_add_region(u64 start, u64 size, int type);
  87extern void e820_print_map(char *who);
  88extern int
  89sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map);
  90extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
  91                               unsigned new_type);
  92extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
  93                             int checktype);
  94extern void update_e820(void);
  95extern void e820_setup_gap(void);
  96extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
  97                        unsigned long start_addr, unsigned long long end_addr);
  98struct setup_data;
  99extern void parse_e820_ext(struct setup_data *data);
 100
 101#if defined(CONFIG_X86_64) || \
 102        (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
 103extern void e820_mark_nosave_regions(unsigned long limit_pfn);
 104#else
 105static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
 106{
 107}
 108#endif
 109
 110#ifdef CONFIG_MEMTEST
 111extern void early_memtest(unsigned long start, unsigned long end);
 112#else
 113static inline void early_memtest(unsigned long start, unsigned long end)
 114{
 115}
 116#endif
 117
 118extern unsigned long e820_end_of_ram_pfn(void);
 119extern unsigned long e820_end_of_low_ram_pfn(void);
 120extern u64 early_reserve_e820(u64 sizet, u64 align);
 121
 122void memblock_x86_fill(void);
 123void memblock_find_dma_reserve(void);
 124
 125extern void finish_e820_parsing(void);
 126extern void e820_reserve_resources(void);
 127extern void e820_reserve_resources_late(void);
 128extern void setup_memory_map(void);
 129extern char *default_machine_specific_memory_setup(void);
 130
 131/*
 132 * Returns true iff the specified range [s,e) is completely contained inside
 133 * the ISA region.
 134 */
 135static inline bool is_ISA_range(u64 s, u64 e)
 136{
 137        return s >= ISA_START_ADDRESS && e <= ISA_END_ADDRESS;
 138}
 139
 140#endif /* __KERNEL__ */
 141#endif /* __ASSEMBLY__ */
 142
 143#ifdef __KERNEL__
 144#include <linux/ioport.h>
 145
 146#define HIGH_MEMORY     (1024*1024)
 147#endif /* __KERNEL__ */
 148
 149#endif /* _ASM_X86_E820_H */
 150
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