1 #ifndef _LINUX_VMALLOC_H 2 #define _LINUX_VMALLOC_H 3 4 #include <linux/spinlock.h> 5 #include <asm/page.h> /* pgprot_t */ 6 7 struct vm_area_struct; 8 9 /* bits in vm_struct->flags */ 10 #define VM_IOREMAP 0x00000001 /* ioremap() and friends */ 11 #define VM_ALLOC 0x00000002 /* vmalloc() */ 12 #define VM_MAP 0x00000004 /* vmap()ed pages */ 13 #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */ 14 #define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */ 15 /* bits [20..32] reserved for arch specific ioremap internals */ 16 17 /* 18 * Maximum alignment for ioremap() regions. 19 * Can be overriden by arch-specific value. 20 */ 21 #ifndef IOREMAP_MAX_ORDER 22 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */ 23 #endif 24 25 struct vm_struct { 26 /* keep next,addr,size together to speedup lookups */ 27 struct vm_struct *next; 28 void *addr; 29 unsigned long size; 30 unsigned long flags; 31 struct page **pages; 32 unsigned int nr_pages; 33 unsigned long phys_addr; 34 void *caller; 35 }; 36 37 /* 38 * Highlevel APIs for driver use 39 */ 40 extern void *vmalloc(unsigned long size); 41 extern void *vmalloc_user(unsigned long size); 42 extern void *vmalloc_node(unsigned long size, int node); 43 extern void *vmalloc_exec(unsigned long size); 44 extern void *vmalloc_32(unsigned long size); 45 extern void *vmalloc_32_user(unsigned long size); 46 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); 47 extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask, 48 pgprot_t prot); 49 extern void vfree(const void *addr); 50 51 extern void *vmap(struct page **pages, unsigned int count, 52 unsigned long flags, pgprot_t prot); 53 extern void vunmap(const void *addr); 54 55 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 56 unsigned long pgoff); 57 void vmalloc_sync_all(void); 58 59 /* 60 * Lowlevel-APIs (not for driver use!) 61 */ 62 63 static inline size_t get_vm_area_size(const struct vm_struct *area) 64 { 65 /* return actual size without guard page */ 66 return area->size - PAGE_SIZE; 67 } 68 69 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 70 extern struct vm_struct *get_vm_area_caller(unsigned long size, 71 unsigned long flags, void *caller); 72 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, 73 unsigned long start, unsigned long end); 74 extern struct vm_struct *get_vm_area_node(unsigned long size, 75 unsigned long flags, int node, 76 gfp_t gfp_mask); 77 extern struct vm_struct *remove_vm_area(const void *addr); 78 79 extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 80 struct page ***pages); 81 extern void unmap_kernel_range(unsigned long addr, unsigned long size); 82 83 /* Allocate/destroy a 'vmalloc' VM area. */ 84 extern struct vm_struct *alloc_vm_area(size_t size); 85 extern void free_vm_area(struct vm_struct *area); 86 87 /* 88 * Internals. Dont't use.. 89 */ 90 extern rwlock_t vmlist_lock; 91 extern struct vm_struct *vmlist; 92 93 extern const struct seq_operations vmalloc_op; 94 95 #endif /* _LINUX_VMALLOC_H */ 96