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