1 #ifndef _LINUX_MEMBLOCK_H 2 #define _LINUX_MEMBLOCK_H 3 #ifdef __KERNEL__ 4 5 #ifdef CONFIG_HAVE_MEMBLOCK 6 /* 7 * Logical memory blocks. 8 * 9 * Copyright (C) 2001 Peter Bergner, IBM Corp. 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17 #include <linux/init.h> 18 #include <linux/mm.h> 19 20 #define INIT_MEMBLOCK_REGIONS 128 21 22 struct memblock_region { 23 phys_addr_t base; 24 phys_addr_t size; 25 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 26 int nid; 27 #endif 28 }; 29 30 struct memblock_type { 31 unsigned long cnt; /* number of regions */ 32 unsigned long max; /* size of the allocated array */ 33 phys_addr_t total_size; /* size of all regions */ 34 struct memblock_region *regions; 35 }; 36 37 struct memblock { 38 phys_addr_t current_limit; 39 struct memblock_type memory; 40 struct memblock_type reserved; 41 }; 42 43 extern struct memblock memblock; 44 extern int memblock_debug; 45 46 #define memblock_dbg(fmt, ...) \ 47 if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) 48 49 phys_addr_t memblock_find_in_range_node(phys_addr_t start, phys_addr_t end, 50 phys_addr_t size, phys_addr_t align, int nid); 51 phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end, 52 phys_addr_t size, phys_addr_t align); 53 phys_addr_t get_allocated_memblock_reserved_regions_info(phys_addr_t *addr); 54 void memblock_allow_resize(void); 55 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); 56 int memblock_add(phys_addr_t base, phys_addr_t size); 57 int memblock_remove(phys_addr_t base, phys_addr_t size); 58 int memblock_free(phys_addr_t base, phys_addr_t size); 59 int memblock_reserve(phys_addr_t base, phys_addr_t size); 60 61 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 62 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 63 unsigned long *out_end_pfn, int *out_nid); 64 65 /** 66 * for_each_mem_pfn_range - early memory pfn range iterator 67 * @i: an integer used as loop variable 68 * @nid: node selector, %MAX_NUMNODES for all nodes 69 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 70 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 71 * @p_nid: ptr to int for nid of the range, can be %NULL 72 * 73 * Walks over configured memory ranges. 74 */ 75 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 76 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 77 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 78 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 79 80 void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start, 81 phys_addr_t *out_end, int *out_nid); 82 83 /** 84 * for_each_free_mem_range - iterate through free memblock areas 85 * @i: u64 used as loop variable 86 * @nid: node selector, %MAX_NUMNODES for all nodes 87 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 88 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 89 * @p_nid: ptr to int for nid of the range, can be %NULL 90 * 91 * Walks over free (memory && !reserved) areas of memblock. Available as 92 * soon as memblock is initialized. 93 */ 94 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid) \ 95 for (i = 0, \ 96 __next_free_mem_range(&i, nid, p_start, p_end, p_nid); \ 97 i != (u64)ULLONG_MAX; \ 98 __next_free_mem_range(&i, nid, p_start, p_end, p_nid)) 99 100 void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start, 101 phys_addr_t *out_end, int *out_nid); 102 103 /** 104 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 105 * @i: u64 used as loop variable 106 * @nid: node selector, %MAX_NUMNODES for all nodes 107 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 108 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 109 * @p_nid: ptr to int for nid of the range, can be %NULL 110 * 111 * Walks over free (memory && !reserved) areas of memblock in reverse 112 * order. Available as soon as memblock is initialized. 113 */ 114 #define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid) \ 115 for (i = (u64)ULLONG_MAX, \ 116 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid); \ 117 i != (u64)ULLONG_MAX; \ 118 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid)) 119 120 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 121 int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid); 122 123 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 124 { 125 r->nid = nid; 126 } 127 128 static inline int memblock_get_region_node(const struct memblock_region *r) 129 { 130 return r->nid; 131 } 132 #else 133 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 134 { 135 } 136 137 static inline int memblock_get_region_node(const struct memblock_region *r) 138 { 139 return 0; 140 } 141 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 142 143 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 144 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 145 146 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align); 147 148 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */ 149 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 150 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 151 152 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 153 phys_addr_t max_addr); 154 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align, 155 phys_addr_t max_addr); 156 phys_addr_t memblock_phys_mem_size(void); 157 phys_addr_t memblock_start_of_DRAM(void); 158 phys_addr_t memblock_end_of_DRAM(void); 159 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 160 int memblock_is_memory(phys_addr_t addr); 161 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 162 int memblock_is_reserved(phys_addr_t addr); 163 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 164 165 extern void __memblock_dump_all(void); 166 167 static inline void memblock_dump_all(void) 168 { 169 if (memblock_debug) 170 __memblock_dump_all(); 171 } 172 173 /** 174 * memblock_set_current_limit - Set the current allocation limit to allow 175 * limiting allocations to what is currently 176 * accessible during boot 177 * @limit: New limit value (physical address) 178 */ 179 void memblock_set_current_limit(phys_addr_t limit); 180 181 182 /* 183 * pfn conversion functions 184 * 185 * While the memory MEMBLOCKs should always be page aligned, the reserved 186 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 187 * idea of what they return for such non aligned MEMBLOCKs. 188 */ 189 190 /** 191 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region 192 * @reg: memblock_region structure 193 */ 194 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 195 { 196 return PFN_UP(reg->base); 197 } 198 199 /** 200 * memblock_region_memory_end_pfn - Return the end_pfn this region 201 * @reg: memblock_region structure 202 */ 203 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 204 { 205 return PFN_DOWN(reg->base + reg->size); 206 } 207 208 /** 209 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region 210 * @reg: memblock_region structure 211 */ 212 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 213 { 214 return PFN_DOWN(reg->base); 215 } 216 217 /** 218 * memblock_region_reserved_end_pfn - Return the end_pfn this region 219 * @reg: memblock_region structure 220 */ 221 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 222 { 223 return PFN_UP(reg->base + reg->size); 224 } 225 226 #define for_each_memblock(memblock_type, region) \ 227 for (region = memblock.memblock_type.regions; \ 228 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 229 region++) 230 231 232 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK 233 #define __init_memblock __meminit 234 #define __initdata_memblock __meminitdata 235 #else 236 #define __init_memblock 237 #define __initdata_memblock 238 #endif 239 240 #else 241 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align) 242 { 243 return 0; 244 } 245 246 #endif /* CONFIG_HAVE_MEMBLOCK */ 247 248 #endif /* __KERNEL__ */ 249 250 #endif /* _LINUX_MEMBLOCK_H */ 251