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__ 52 #include <linux/types.h> 53 struct e820entry { 54 __u64 addr; /* start of memory segment */ 55 __u64 size; /* size of memory segment */ 56 __u32 type; /* type of memory segment */ 57 } __attribute__((packed)); 58 59 struct e820map { 60 __u32 nr_map; 61 struct e820entry map[E820_X_MAX]; 62 }; 63 64 #define ISA_START_ADDRESS 0xa0000 65 #define ISA_END_ADDRESS 0x100000 66 67 #define BIOS_BEGIN 0x000a0000 68 #define BIOS_END 0x00100000 69 70 #ifdef __KERNEL__ 71 /* see comment in arch/x86/kernel/e820.c */ 72 extern struct e820map e820; 73 extern struct e820map e820_saved; 74 75 extern unsigned long pci_mem_start; 76 extern int e820_any_mapped(u64 start, u64 end, unsigned type); 77 extern int e820_all_mapped(u64 start, u64 end, unsigned type); 78 extern void e820_add_region(u64 start, u64 size, int type); 79 extern void e820_print_map(char *who); 80 extern int 81 sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map); 82 extern u64 e820_update_range(u64 start, u64 size, unsigned old_type, 83 unsigned new_type); 84 extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type, 85 int checktype); 86 extern void update_e820(void); 87 extern void e820_setup_gap(void); 88 extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize, 89 unsigned long start_addr, unsigned long long end_addr); 90 struct setup_data; 91 extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data); 92 93 #if defined(CONFIG_X86_64) || \ 94 (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION)) 95 extern void e820_mark_nosave_regions(unsigned long limit_pfn); 96 #else 97 static inline void e820_mark_nosave_regions(unsigned long limit_pfn) 98 { 99 } 100 #endif 101 102 #ifdef CONFIG_MEMTEST 103 extern void early_memtest(unsigned long start, unsigned long end); 104 #else 105 static inline void early_memtest(unsigned long start, unsigned long end) 106 { 107 } 108 #endif 109 110 extern unsigned long end_user_pfn; 111 112 extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align); 113 extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align); 114 extern void reserve_early(u64 start, u64 end, char *name); 115 extern void reserve_early_overlap_ok(u64 start, u64 end, char *name); 116 extern void free_early(u64 start, u64 end); 117 extern void early_res_to_bootmem(u64 start, u64 end); 118 extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align); 119 120 extern unsigned long e820_end_of_ram_pfn(void); 121 extern unsigned long e820_end_of_low_ram_pfn(void); 122 extern int e820_find_active_region(const struct e820entry *ei, 123 unsigned long start_pfn, 124 unsigned long last_pfn, 125 unsigned long *ei_startpfn, 126 unsigned long *ei_endpfn); 127 extern void e820_register_active_regions(int nid, unsigned long start_pfn, 128 unsigned long end_pfn); 129 extern u64 e820_hole_size(u64 start, u64 end); 130 extern void finish_e820_parsing(void); 131 extern void e820_reserve_resources(void); 132 extern void e820_reserve_resources_late(void); 133 extern void setup_memory_map(void); 134 extern char *default_machine_specific_memory_setup(void); 135 136 /* 137 * Returns true iff the specified range [s,e) is completely contained inside 138 * the ISA region. 139 */ 140 /* 141 static inline bool is_ISA_range(u64 s, u64 e) 142 { 143 return s >= ISA_START_ADDRESS && e <= ISA_END_ADDRESS; 144 } 145 */ 146 #endif /* __KERNEL__ */ 147 #endif /* __ASSEMBLY__ */ 148 149 #ifdef __KERNEL__ 150 /* #include <linux/ioport.h> */ 151 152 #define HIGH_MEMORY (1024*1024) 153 #endif /* __KERNEL__ */ 154 155 #endif /* _ASM_X86_E820_H */ 156