LXR linux/arch/x86/include/asm/e820.h

   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/* reserved RAM used by kernel itself */
  49#define E820_RESERVED_KERN        128
  50
  51#ifndef __ASSEMBLY__
  52struct 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
  58struct e820map {
  59        __u32 nr_map;
  60        struct e820entry map[E820_X_MAX];
  61};
  62
  63#ifdef __KERNEL__
  64/* see comment in arch/x86/kernel/e820.c */
  65extern struct e820map e820;
  66extern struct e820map e820_saved;
  67
  68extern unsigned long pci_mem_start;
  69extern int e820_any_mapped(u64 start, u64 end, unsigned type);
  70extern int e820_all_mapped(u64 start, u64 end, unsigned type);
  71extern void e820_add_region(u64 start, u64 size, int type);
  72extern void e820_print_map(char *who);
  73extern int
  74sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, int *pnr_map);
  75extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
  76                               unsigned new_type);
  77extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
  78                             int checktype);
  79extern void update_e820(void);
  80extern void e820_setup_gap(void);
  81extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
  82                        unsigned long start_addr, unsigned long long end_addr);
  83struct setup_data;
  84extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data);
  85
  86#if defined(CONFIG_X86_64) || \
  87        (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
  88extern void e820_mark_nosave_regions(unsigned long limit_pfn);
  89#else
  90static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
  91{
  92}
  93#endif
  94
  95#ifdef CONFIG_MEMTEST
  96extern void early_memtest(unsigned long start, unsigned long end);
  97#else
  98static inline void early_memtest(unsigned long start, unsigned long end)
  99{
 100}
 101#endif
 102
 103extern unsigned long end_user_pfn;
 104
 105extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
 106extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
 107extern void reserve_early(u64 start, u64 end, char *name);
 108extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
 109extern void free_early(u64 start, u64 end);
 110extern void early_res_to_bootmem(u64 start, u64 end);
 111extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
 112
 113extern unsigned long e820_end_of_ram_pfn(void);
 114extern unsigned long e820_end_of_low_ram_pfn(void);
 115extern int e820_find_active_region(const struct e820entry *ei,
 116                                  unsigned long start_pfn,
 117                                  unsigned long last_pfn,
 118                                  unsigned long *ei_startpfn,
 119                                  unsigned long *ei_endpfn);
 120extern void e820_register_active_regions(int nid, unsigned long start_pfn,
 121                                         unsigned long end_pfn);
 122extern u64 e820_hole_size(u64 start, u64 end);
 123extern void finish_e820_parsing(void);
 124extern void e820_reserve_resources(void);
 125extern void e820_reserve_resources_late(void);
 126extern void setup_memory_map(void);
 127extern char *default_machine_specific_memory_setup(void);
 128extern char *machine_specific_memory_setup(void);
 129extern char *memory_setup(void);
 130#endif /* __KERNEL__ */
 131#endif /* __ASSEMBLY__ */
 132
 133#define ISA_START_ADDRESS       0xa0000
 134#define ISA_END_ADDRESS         0x100000
 135#define is_ISA_range(s, e) ((s) >= ISA_START_ADDRESS && (e) < ISA_END_ADDRESS)
 136
 137#define BIOS_BEGIN              0x000a0000
 138#define BIOS_END                0x00100000
 139
 140#ifdef __KERNEL__
 141#include <linux/ioport.h>
 142
 143#define HIGH_MEMORY     (1024*1024)
 144#endif /* __KERNEL__ */
 145
 146#endif /* _ASM_X86_E820_H */
 147