/arch/x86/include/asm/e820.h
C++ Header | 156 lines | 102 code | 21 blank | 33 comment | 3 complexity | 2bb7d36d7fd3199627f030429266bbe6 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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#ifdef __KERNEL__ 76/* see comment in arch/x86/kernel/e820.c */ 77extern struct e820map e820; 78extern struct e820map e820_saved; 79 80extern unsigned long pci_mem_start; 81extern int e820_any_mapped(u64 start, u64 end, unsigned type); 82extern int e820_all_mapped(u64 start, u64 end, unsigned type); 83extern void e820_add_region(u64 start, u64 size, int type); 84extern void e820_print_map(char *who); 85extern int 86sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map); 87extern u64 e820_update_range(u64 start, u64 size, unsigned old_type, 88 unsigned new_type); 89extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type, 90 int checktype); 91extern void update_e820(void); 92extern void e820_setup_gap(void); 93extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize, 94 unsigned long start_addr, unsigned long long end_addr); 95struct setup_data; 96extern 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)) 100extern void e820_mark_nosave_regions(unsigned long limit_pfn); 101#else 102static inline void e820_mark_nosave_regions(unsigned long limit_pfn) 103{ 104} 105#endif 106 107#ifdef CONFIG_MEMTEST 108extern void early_memtest(unsigned long start, unsigned long end); 109#else 110static inline void early_memtest(unsigned long start, unsigned long end) 111{ 112} 113#endif 114 115extern unsigned long end_user_pfn; 116 117extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align); 118extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align); 119extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align); 120#include <linux/early_res.h> 121 122extern unsigned long e820_end_of_ram_pfn(void); 123extern unsigned long e820_end_of_low_ram_pfn(void); 124extern int e820_find_active_region(const struct e820entry *ei, 125 unsigned long start_pfn, 126 unsigned long last_pfn, 127 unsigned long *ei_startpfn, 128 unsigned long *ei_endpfn); 129extern void e820_register_active_regions(int nid, unsigned long start_pfn, 130 unsigned long end_pfn); 131extern u64 e820_hole_size(u64 start, u64 end); 132extern void finish_e820_parsing(void); 133extern void e820_reserve_resources(void); 134extern void e820_reserve_resources_late(void); 135extern void setup_memory_map(void); 136extern char *default_machine_specific_memory_setup(void); 137 138/* 139 * Returns true iff the specified range [s,e) is completely contained inside 140 * the ISA region. 141 */ 142static inline bool is_ISA_range(u64 s, u64 e) 143{ 144 return s >= ISA_START_ADDRESS && e <= ISA_END_ADDRESS; 145} 146 147#endif /* __KERNEL__ */ 148#endif /* __ASSEMBLY__ */ 149 150#ifdef __KERNEL__ 151#include <linux/ioport.h> 152 153#define HIGH_MEMORY (1024*1024) 154#endif /* __KERNEL__ */ 155 156#endif /* _ASM_X86_E820_H */