1 #ifndef _LINUX_VMALLOC_H 2 #define _LINUX_VMALLOC_H 3 4 #include <linux/spinlock.h> 5 #include <linux/init.h> 6 #include <linux/list.h> 7 #include <asm/page.h> /* pgprot_t */ 8 #include <linux/rbtree.h> 9 10 struct vm_area_struct; /* vma defining user mapping in mm_types.h */ 11 12 /* bits in flags of vmalloc's vm_struct below */ 13 #define VM_IOREMAP 0x00000001 /* ioremap() and friends */ 14 #define VM_ALLOC 0x00000002 /* vmalloc() */ 15 #define VM_MAP 0x00000004 /* vmap()ed pages */ 16 #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */ 17 #define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */ 18 #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */ 19 /* bits [20..32] reserved for arch specific ioremap internals */ 20 21 /* 22 * Maximum alignment for ioremap() regions. 23 * Can be overriden by arch-specific value. 24 */ 25 #ifndef IOREMAP_MAX_ORDER 26 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */ 27 #endif 28 29 struct vm_struct { 30 struct vm_struct *next; 31 void *addr; 32 unsigned long size; 33 unsigned long flags; 34 struct page **pages; 35 unsigned int nr_pages; 36 phys_addr_t phys_addr; 37 const void *caller; 38 }; 39 40 struct vmap_area { 41 unsigned long va_start; 42 unsigned long va_end; 43 unsigned long flags; 44 struct rb_node rb_node; /* address sorted rbtree */ 45 struct list_head list; /* address sorted list */ 46 struct list_head purge_list; /* "lazy purge" list */ 47 struct vm_struct *vm; 48 struct rcu_head rcu_head; 49 }; 50 51 /* 52 * Highlevel APIs for driver use 53 */ 54 extern void vm_unmap_ram(const void *mem, unsigned int count); 55 extern void *vm_map_ram(struct page **pages, unsigned int count, 56 int node, pgprot_t prot); 57 extern void vm_unmap_aliases(void); 58 59 #ifdef CONFIG_MMU 60 extern void __init vmalloc_init(void); 61 #else 62 static inline void vmalloc_init(void) 63 { 64 } 65 #endif 66 67 extern void *vmalloc(unsigned long size); 68 extern void *vzalloc(unsigned long size); 69 extern void *vmalloc_user(unsigned long size); 70 extern void *vmalloc_node(unsigned long size, int node); 71 extern void *vzalloc_node(unsigned long size, int node); 72 extern void *vmalloc_exec(unsigned long size); 73 extern void *vmalloc_32(unsigned long size); 74 extern void *vmalloc_32_user(unsigned long size); 75 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); 76 extern void *__vmalloc_node_range(unsigned long size, unsigned long align, 77 unsigned long start, unsigned long end, gfp_t gfp_mask, 78 pgprot_t prot, int node, const void *caller); 79 extern void vfree(const void *addr); 80 81 extern void *vmap(struct page **pages, unsigned int count, 82 unsigned long flags, pgprot_t prot); 83 extern void vunmap(const void *addr); 84 85 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, 86 unsigned long uaddr, void *kaddr, 87 unsigned long size); 88 89 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 90 unsigned long pgoff); 91 void vmalloc_sync_all(void); 92 93 /* 94 * Lowlevel-APIs (not for driver use!) 95 */ 96 97 static inline size_t get_vm_area_size(const struct vm_struct *area) 98 { 99 /* return actual size without guard page */ 100 return area->size - PAGE_SIZE; 101 } 102 103 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 104 extern struct vm_struct *get_vm_area_caller(unsigned long size, 105 unsigned long flags, const void *caller); 106 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, 107 unsigned long start, unsigned long end); 108 extern struct vm_struct *__get_vm_area_caller(unsigned long size, 109 unsigned long flags, 110 unsigned long start, unsigned long end, 111 const void *caller); 112 extern struct vm_struct *remove_vm_area(const void *addr); 113 extern struct vm_struct *find_vm_area(const void *addr); 114 115 extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 116 struct page ***pages); 117 #ifdef CONFIG_MMU 118 extern int map_kernel_range_noflush(unsigned long start, unsigned long size, 119 pgprot_t prot, struct page **pages); 120 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); 121 extern void unmap_kernel_range(unsigned long addr, unsigned long size); 122 #else 123 static inline int 124 map_kernel_range_noflush(unsigned long start, unsigned long size, 125 pgprot_t prot, struct page **pages) 126 { 127 return size >> PAGE_SHIFT; 128 } 129 static inline void 130 unmap_kernel_range_noflush(unsigned long addr, unsigned long size) 131 { 132 } 133 static inline void 134 unmap_kernel_range(unsigned long addr, unsigned long size) 135 { 136 } 137 #endif 138 139 /* Allocate/destroy a 'vmalloc' VM area. */ 140 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes); 141 extern void free_vm_area(struct vm_struct *area); 142 143 /* for /dev/kmem */ 144 extern long vread(char *buf, char *addr, unsigned long count); 145 extern long vwrite(char *buf, char *addr, unsigned long count); 146 147 /* 148 * Internals. Dont't use.. 149 */ 150 extern struct list_head vmap_area_list; 151 extern __init void vm_area_add_early(struct vm_struct *vm); 152 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 153 154 #ifdef CONFIG_SMP 155 # ifdef CONFIG_MMU 156 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 157 const size_t *sizes, int nr_vms, 158 size_t align); 159 160 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 161 # else 162 static inline struct vm_struct ** 163 pcpu_get_vm_areas(const unsigned long *offsets, 164 const size_t *sizes, int nr_vms, 165 size_t align) 166 { 167 return NULL; 168 } 169 170 static inline void 171 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) 172 { 173 } 174 # endif 175 #endif 176 177 struct vmalloc_info { 178 unsigned long used; 179 unsigned long largest_chunk; 180 }; 181 182 #ifdef CONFIG_MMU 183 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) 184 extern void get_vmalloc_info(struct vmalloc_info *vmi); 185 #else 186 187 #define VMALLOC_TOTAL 0UL 188 #define get_vmalloc_info(vmi) \ 189 do { \ 190 (vmi)->used = 0; \ 191 (vmi)->largest_chunk = 0; \ 192 } while (0) 193 #endif 194 195 #endif /* _LINUX_VMALLOC_H */ 196