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 int memblock_free_reserved_regions(void); 54 int memblock_reserve_reserved_regions(void); 55 56 void memblock_allow_resize(void); 57 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); 58 int memblock_add(phys_addr_t base, phys_addr_t size); 59 int memblock_remove(phys_addr_t base, phys_addr_t size); 60 int memblock_free(phys_addr_t base, phys_addr_t size); 61 int memblock_reserve(phys_addr_t base, phys_addr_t size); 62 63 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 64 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 65 unsigned long *out_end_pfn, int *out_nid); 66 67 /** 68 * for_each_mem_pfn_range - early memory pfn range iterator 69 * @i: an integer used as loop variable 70 * @nid: node selector, %MAX_NUMNODES for all nodes 71 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 72 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 73 * @p_nid: ptr to int for nid of the range, can be %NULL 74 * 75 * Walks over configured memory ranges. Available after early_node_map is 76 * populated. 77 */ 78 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 79 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 80 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 81 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 82 83 void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start, 84 phys_addr_t *out_end, int *out_nid); 85 86 /** 87 * for_each_free_mem_range - iterate through free memblock areas 88 * @i: u64 used as loop variable 89 * @nid: node selector, %MAX_NUMNODES for all nodes 90 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 91 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 92 * @p_nid: ptr to int for nid of the range, can be %NULL 93 * 94 * Walks over free (memory && !reserved) areas of memblock. Available as 95 * soon as memblock is initialized. 96 */ 97 #define for_each_free_mem_range(i, nid, p_start, p_end, p_nid) \ 98 for (i = 0, \ 99 __next_free_mem_range(&i, nid, p_start, p_end, p_nid); \ 100 i != (u64)ULLONG_MAX; \ 101 __next_free_mem_range(&i, nid, p_start, p_end, p_nid)) 102 103 void __next_free_mem_range_rev(u64 *idx, int nid, phys_addr_t *out_start, 104 phys_addr_t *out_end, int *out_nid); 105 106 /** 107 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 108 * @i: u64 used as loop variable 109 * @nid: node selector, %MAX_NUMNODES for all nodes 110 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 111 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 112 * @p_nid: ptr to int for nid of the range, can be %NULL 113 * 114 * Walks over free (memory && !reserved) areas of memblock in reverse 115 * order. Available as soon as memblock is initialized. 116 */ 117 #define for_each_free_mem_range_reverse(i, nid, p_start, p_end, p_nid) \ 118 for (i = (u64)ULLONG_MAX, \ 119 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid); \ 120 i != (u64)ULLONG_MAX; \ 121 __next_free_mem_range_rev(&i, nid, p_start, p_end, p_nid)) 122 123 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP 124 int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid); 125 126 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 127 { 128 r->nid = nid; 129 } 130 131 static inline int memblock_get_region_node(const struct memblock_region *r) 132 { 133 return r->nid; 134 } 135 #else 136 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 137 { 138 } 139 140 static inline int memblock_get_region_node(const struct memblock_region *r) 141 { 142 return 0; 143 } 144 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ 145 146 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid); 147 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 148 149 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align); 150 151 /* Flags for memblock_alloc_base() amd __memblock_alloc_base() */ 152 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 153 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 154 155 phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align, 156 phys_addr_t max_addr); 157 phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align, 158 phys_addr_t max_addr); 159 phys_addr_t memblock_phys_mem_size(void); 160 phys_addr_t memblock_start_of_DRAM(void); 161 phys_addr_t memblock_end_of_DRAM(void); 162 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 163 int memblock_is_memory(phys_addr_t addr); 164 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 165 int memblock_is_reserved(phys_addr_t addr); 166 int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 167 168 extern void __memblock_dump_all(void); 169 170 static inline void memblock_dump_all(void) 171 { 172 if (memblock_debug) 173 __memblock_dump_all(); 174 } 175 176 /** 177 * memblock_set_current_limit - Set the current allocation limit to allow 178 * limiting allocations to what is currently 179 * accessible during boot 180 * @limit: New limit value (physical address) 181 */ 182 void memblock_set_current_limit(phys_addr_t limit); 183 184 185 /* 186 * pfn conversion functions 187 * 188 * While the memory MEMBLOCKs should always be page aligned, the reserved 189 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 190 * idea of what they return for such non aligned MEMBLOCKs. 191 */ 192 193 /** 194 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region 195 * @reg: memblock_region structure 196 */ 197 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 198 { 199 return PFN_UP(reg->base); 200 } 201 202 /** 203 * memblock_region_memory_end_pfn - Return the end_pfn this region 204 * @reg: memblock_region structure 205 */ 206 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 207 { 208 return PFN_DOWN(reg->base + reg->size); 209 } 210 211 /** 212 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region 213 * @reg: memblock_region structure 214 */ 215 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 216 { 217 return PFN_DOWN(reg->base); 218 } 219 220 /** 221 * memblock_region_reserved_end_pfn - Return the end_pfn this region 222 * @reg: memblock_region structure 223 */ 224 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 225 { 226 return PFN_UP(reg->base + reg->size); 227 } 228 229 #define for_each_memblock(memblock_type, region) \ 230 for (region = memblock.memblock_type.regions; \ 231 region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ 232 region++) 233 234 235 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK 236 #define __init_memblock __meminit 237 #define __initdata_memblock __meminitdata 238 #else 239 #define __init_memblock 240 #define __initdata_memblock 241 #endif 242 243 #else 244 static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align) 245 { 246 return 0; 247 } 248 249 #endif /* CONFIG_HAVE_MEMBLOCK */ 250 251 #endif /* __KERNEL__ */ 252 253 #endif /* _LINUX_MEMBLOCK_H */ 254