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 /* bits [20..32] reserved for arch specific ioremap internals */ 17 18 /* 19 * Maximum alignment for ioremap() regions. 20 * Can be overriden by arch-specific value. 21 */ 22 #ifndef IOREMAP_MAX_ORDER 23 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */ 24 #endif 25 26 struct vm_struct { 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 phys_addr_t phys_addr; 34 void *caller; 35 }; 36 37 /* 38 * Highlevel APIs for driver use 39 */ 40 extern void vm_unmap_ram(const void *mem, unsigned int count); 41 extern void *vm_map_ram(struct page **pages, unsigned int count, 42 int node, pgprot_t prot); 43 extern void vm_unmap_aliases(void); 44 45 #ifdef CONFIG_MMU 46 extern void __init vmalloc_init(void); 47 #else 48 static inline void vmalloc_init(void) 49 { 50 } 51 #endif 52 53 extern void *vmalloc(unsigned long size); 54 extern void *vzalloc(unsigned long size); 55 extern void *vmalloc_user(unsigned long size); 56 extern void *vmalloc_node(unsigned long size, int node); 57 extern void *vzalloc_node(unsigned long size, int node); 58 extern void *vmalloc_exec(unsigned long size); 59 extern void *vmalloc_32(unsigned long size); 60 extern void *vmalloc_32_user(unsigned long size); 61 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); 62 extern void *__vmalloc_node_range(unsigned long size, unsigned long align, 63 unsigned long start, unsigned long end, gfp_t gfp_mask, 64 pgprot_t prot, int node, void *caller); 65 extern void vfree(const void *addr); 66 67 extern void *vmap(struct page **pages, unsigned int count, 68 unsigned long flags, pgprot_t prot); 69 extern void vunmap(const void *addr); 70 71 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 72 unsigned long pgoff); 73 void vmalloc_sync_all(void); 74 75 /* 76 * Lowlevel-APIs (not for driver use!) 77 */ 78 79 static inline size_t get_vm_area_size(const struct vm_struct *area) 80 { 81 /* return actual size without guard page */ 82 return area->size - PAGE_SIZE; 83 } 84 85 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 86 extern struct vm_struct *get_vm_area_caller(unsigned long size, 87 unsigned long flags, void *caller); 88 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, 89 unsigned long start, unsigned long end); 90 extern struct vm_struct *__get_vm_area_caller(unsigned long size, 91 unsigned long flags, 92 unsigned long start, unsigned long end, 93 void *caller); 94 extern struct vm_struct *remove_vm_area(const void *addr); 95 96 extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 97 struct page ***pages); 98 extern int map_kernel_range_noflush(unsigned long start, unsigned long size, 99 pgprot_t prot, struct page **pages); 100 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); 101 extern void unmap_kernel_range(unsigned long addr, unsigned long size); 102 103 /* Allocate/destroy a 'vmalloc' VM area. */ 104 extern struct vm_struct *alloc_vm_area(size_t size); 105 extern void free_vm_area(struct vm_struct *area); 106 107 /* for /dev/kmem */ 108 extern long vread(char *buf, char *addr, unsigned long count); 109 extern long vwrite(char *buf, char *addr, unsigned long count); 110 111 /* 112 * Internals. Dont't use.. 113 */ 114 extern rwlock_t vmlist_lock; 115 extern struct vm_struct *vmlist; 116 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 117 118 #ifdef CONFIG_SMP 119 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 120 const size_t *sizes, int nr_vms, 121 size_t align); 122 123 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 124 #endif 125 126 #endif /* _LINUX_VMALLOC_H */ 127