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