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 extern bool vmap_lazy_unmap; 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 /* bits [20..32] reserved for arch specific ioremap internals */ 19 20 /* 21 * Maximum alignment for ioremap() regions. 22 * Can be overriden by arch-specific value. 23 */ 24 #ifndef IOREMAP_MAX_ORDER 25 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */ 26 #endif 27 28 struct vm_struct { 29 struct vm_struct *next; 30 void *addr; 31 unsigned long size; 32 unsigned long flags; 33 struct page **pages; 34 unsigned int nr_pages; 35 phys_addr_t phys_addr; 36 void *caller; 37 }; 38 39 /* 40 * Highlevel APIs for driver use 41 */ 42 extern void vm_unmap_ram(const void *mem, unsigned int count); 43 extern void *vm_map_ram(struct page **pages, unsigned int count, 44 int node, pgprot_t prot); 45 extern void vm_unmap_aliases(void); 46 47 #ifdef CONFIG_MMU 48 extern void __init vmalloc_init(void); 49 #else 50 static inline void vmalloc_init(void) 51 { 52 } 53 #endif 54 55 extern void *vmalloc(unsigned long size); 56 extern void *vmalloc_user(unsigned long size); 57 extern void *vmalloc_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_area(struct vm_struct *area, gfp_t gfp_mask, 63 pgprot_t prot); 64 extern void vfree(const void *addr); 65 66 extern void *vmap(struct page **pages, unsigned int count, 67 unsigned long flags, pgprot_t prot); 68 extern void vunmap(const void *addr); 69 70 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 71 unsigned long pgoff); 72 void vmalloc_sync_all(void); 73 74 /* 75 * Lowlevel-APIs (not for driver use!) 76 */ 77 78 static inline size_t get_vm_area_size(const struct vm_struct *area) 79 { 80 /* return actual size without guard page */ 81 return area->size - PAGE_SIZE; 82 } 83 84 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 85 extern struct vm_struct *get_vm_area_caller(unsigned long size, 86 unsigned long flags, void *caller); 87 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, 88 unsigned long start, unsigned long end); 89 extern struct vm_struct *__get_vm_area_caller(unsigned long size, 90 unsigned long flags, 91 unsigned long start, unsigned long end, 92 void *caller); 93 extern struct vm_struct *get_vm_area_node(unsigned long size, 94 unsigned long flags, int node, 95 gfp_t gfp_mask); 96 extern struct vm_struct *remove_vm_area(const void *addr); 97 98 extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 99 struct page ***pages); 100 extern int map_kernel_range_noflush(unsigned long start, unsigned long size, 101 pgprot_t prot, struct page **pages); 102 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); 103 extern void unmap_kernel_range(unsigned long addr, unsigned long size); 104 105 /* Allocate/destroy a 'vmalloc' VM area. */ 106 extern struct vm_struct *alloc_vm_area(size_t size); 107 extern void free_vm_area(struct vm_struct *area); 108 109 /* for /dev/kmem */ 110 extern long vread(char *buf, char *addr, unsigned long count); 111 extern long vwrite(char *buf, char *addr, unsigned long count); 112 113 /* 114 * Internals. Dont't use.. 115 */ 116 extern rwlock_t vmlist_lock; 117 extern struct vm_struct *vmlist; 118 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 119 120 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 121 const size_t *sizes, int nr_vms, 122 size_t align, gfp_t gfp_mask); 123 124 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 125 126 #endif /* _LINUX_VMALLOC_H */ 127