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 *vzalloc(unsigned long size); 57 extern void *vmalloc_user(unsigned long size); 58 extern void *vmalloc_node(unsigned long size, int node); 59 extern void *vzalloc_node(unsigned long size, int node); 60 extern void *vmalloc_exec(unsigned long size); 61 extern void *vmalloc_32(unsigned long size); 62 extern void *vmalloc_32_user(unsigned long size); 63 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); 64 extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask, 65 pgprot_t prot); 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, 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 void *caller); 95 extern struct vm_struct *get_vm_area_node(unsigned long size, 96 unsigned long flags, int node, 97 gfp_t gfp_mask); 98 extern struct vm_struct *remove_vm_area(const void *addr); 99 100 extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 101 struct page ***pages); 102 extern int map_kernel_range_noflush(unsigned long start, unsigned long size, 103 pgprot_t prot, struct page **pages); 104 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); 105 extern void unmap_kernel_range(unsigned long addr, unsigned long size); 106 107 /* Allocate/destroy a 'vmalloc' VM area. */ 108 extern struct vm_struct *alloc_vm_area(size_t size); 109 extern void free_vm_area(struct vm_struct *area); 110 111 /* for /dev/kmem */ 112 extern long vread(char *buf, char *addr, unsigned long count); 113 extern long vwrite(char *buf, char *addr, unsigned long count); 114 115 /* 116 * Internals. Dont't use.. 117 */ 118 extern rwlock_t vmlist_lock; 119 extern struct vm_struct *vmlist; 120 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 121 122 #ifdef CONFIG_SMP 123 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 124 const size_t *sizes, int nr_vms, 125 size_t align, gfp_t gfp_mask); 126 127 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 128 #endif 129 130 #endif /* _LINUX_VMALLOC_H */ 131