diff options
Diffstat (limited to 'include/linux/vmalloc.h')
| -rw-r--r-- | include/linux/vmalloc.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h new file mode 100644 index 00000000..687fb11e --- /dev/null +++ b/include/linux/vmalloc.h @@ -0,0 +1,159 @@ +#ifndef _LINUX_VMALLOC_H +#define _LINUX_VMALLOC_H + +#include <linux/spinlock.h> +#include <linux/init.h> +#include <asm/page.h> /* pgprot_t */ + +struct vm_area_struct; /* vma defining user mapping in mm_types.h */ + +/* bits in flags of vmalloc's vm_struct below */ +#define VM_IOREMAP 0x00000001 /* ioremap() and friends */ +#define VM_ALLOC 0x00000002 /* vmalloc() */ +#define VM_MAP 0x00000004 /* vmap()ed pages */ +#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */ +#define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */ +#define VM_UNLIST 0x00000020 /* vm_struct is not listed in vmlist */ +/* bits [20..32] reserved for arch specific ioremap internals */ + +/* + * Maximum alignment for ioremap() regions. + * Can be overriden by arch-specific value. + */ +#ifndef IOREMAP_MAX_ORDER +#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */ +#endif + +struct vm_struct { + struct vm_struct *next; + void *addr; + unsigned long size; + unsigned long flags; + struct page **pages; + unsigned int nr_pages; + phys_addr_t phys_addr; + void *caller; +}; + +/* + * Highlevel APIs for driver use + */ +extern void vm_unmap_ram(const void *mem, unsigned int count); +extern void *vm_map_ram(struct page **pages, unsigned int count, + int node, pgprot_t prot); +extern void vm_unmap_aliases(void); + +#ifdef CONFIG_MMU +extern void __init vmalloc_init(void); +#else +static inline void vmalloc_init(void) +{ +} +#endif + +extern void *vmalloc(unsigned long size); +extern void *vzalloc(unsigned long size); +extern void *vmalloc_user(unsigned long size); +extern void *vmalloc_node(unsigned long size, int node); +extern void *vzalloc_node(unsigned long size, int node); +extern void *vmalloc_exec(unsigned long size); +extern void *vmalloc_32(unsigned long size); +extern void *vmalloc_32_user(unsigned long size); +extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); +extern void *__vmalloc_node_range(unsigned long size, unsigned long align, + unsigned long start, unsigned long end, gfp_t gfp_mask, + pgprot_t prot, int node, void *caller); +extern void vfree(const void *addr); + +extern void *vmap(struct page **pages, unsigned int count, + unsigned long flags, pgprot_t prot); +extern void vunmap(const void *addr); + +extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, + unsigned long pgoff); +void vmalloc_sync_all(void); + +/* + * Lowlevel-APIs (not for driver use!) + */ + +static inline size_t get_vm_area_size(const struct vm_struct *area) +{ + /* return actual size without guard page */ + return area->size - PAGE_SIZE; +} + +extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); +extern struct vm_struct *get_vm_area_caller(unsigned long size, + unsigned long flags, void *caller); +extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, + unsigned long start, unsigned long end); +extern struct vm_struct *__get_vm_area_caller(unsigned long size, + unsigned long flags, + unsigned long start, unsigned long end, + void *caller); +extern struct vm_struct *remove_vm_area(const void *addr); + +extern int map_vm_area(struct vm_struct *area, pgprot_t prot, + struct page ***pages); +#ifdef CONFIG_MMU +extern int map_kernel_range_noflush(unsigned long start, unsigned long size, + pgprot_t prot, struct page **pages); +extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); +extern void unmap_kernel_range(unsigned long addr, unsigned long size); +#else +static inline int +map_kernel_range_noflush(unsigned long start, unsigned long size, + pgprot_t prot, struct page **pages) +{ + return size >> PAGE_SHIFT; +} +static inline void +unmap_kernel_range_noflush(unsigned long addr, unsigned long size) +{ +} +static inline void +unmap_kernel_range(unsigned long addr, unsigned long size) +{ +} +#endif + +/* Allocate/destroy a 'vmalloc' VM area. */ +extern struct vm_struct *alloc_vm_area(size_t size); +extern void free_vm_area(struct vm_struct *area); + +/* for /dev/kmem */ +extern long vread(char *buf, char *addr, unsigned long count); +extern long vwrite(char *buf, char *addr, unsigned long count); + +/* + * Internals. Dont't use.. + */ +extern rwlock_t vmlist_lock; +extern struct vm_struct *vmlist; +extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); + +#ifdef CONFIG_SMP +# ifdef CONFIG_MMU +struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, + const size_t *sizes, int nr_vms, + size_t align); + +void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); +# else +static inline struct vm_struct ** +pcpu_get_vm_areas(const unsigned long *offsets, + const size_t *sizes, int nr_vms, + size_t align) +{ + return NULL; +} + +static inline void +pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) +{ +} +# endif +#endif + +#endif /* _LINUX_VMALLOC_H */ |