From d24919a7fbc635bea6ecc267058dcdbadf03f565 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 6 Aug 2002 01:05:30 +0200 Subject: VM: Rework vmalloc code to support mapping of arbitray pages The vmalloc operation is split into two pieces: allocate the backing pages and map them into the kernel page tabels for virtually contingous access. (Same for vfree). A new set of interfaces, vmap & vunmap does only the second part and thus allows mapping arbitray pages into kernel virtual memory. The vmalloc.c internals have been completly overhauled to support this, but the exported interfaces are unchanged. --- include/linux/vmalloc.h | 57 ++++++++++++++++++++++++++----------------------- 1 file changed, 30 insertions(+), 27 deletions(-) (limited to 'include/linux/vmalloc.h') diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 9cc67b500368..5da711fefc6f 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -1,44 +1,47 @@ -#ifndef __LINUX_VMALLOC_H -#define __LINUX_VMALLOC_H +#ifndef _LINUX_VMALLOC_H +#define _LINUX_VMALLOC_H #include -#include - /* bits in vm_struct->flags */ #define VM_IOREMAP 0x00000001 /* ioremap() and friends */ #define VM_ALLOC 0x00000002 /* vmalloc() */ +#define VM_MAP 0x00000004 /* vmap()ed pages */ struct vm_struct { - unsigned long flags; - void * addr; - unsigned long size; - unsigned long phys_addr; - struct vm_struct * next; + void *addr; + unsigned long size; + unsigned long flags; + struct page **pages; + unsigned int nr_pages; + unsigned long phys_addr; + struct vm_struct *next; }; -extern struct vm_struct * get_vm_area (unsigned long size, unsigned long flags); -extern void vfree(void * addr); -extern void * __vmalloc (unsigned long size, int gfp_mask, pgprot_t prot); -extern long vread(char *buf, char *addr, unsigned long count); -extern void vmfree_area_pages(unsigned long address, unsigned long size); -extern int vmalloc_area_pages(unsigned long address, unsigned long size, - int gfp_mask, pgprot_t prot); -extern struct vm_struct *remove_kernel_area(void *addr); - /* - * Various ways to allocate pages. + * Highlevel APIs for driver use */ - -extern void * vmalloc(unsigned long size); -extern void * vmalloc_32(unsigned long size); +extern void *vmalloc(unsigned long size); +extern void *vmalloc_32(unsigned long size); +extern void *__vmalloc(unsigned long size, int gfp_mask, pgprot_t prot); +extern void vfree(void *addr); + +extern void *vmap(struct page **pages, unsigned int count); +extern void vunmap(void *addr); + +/* + * Lowlevel-APIs (not for driver use!) + */ +extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); +extern struct vm_struct *remove_vm_area(void *addr); +extern int map_vm_area(struct vm_struct *area, pgprot_t prot, + struct page ***pages); +extern void unmap_vm_area(struct vm_struct *area); /* - * vmlist_lock is a read-write spinlock that protects vmlist - * Used in mm/vmalloc.c (get_vm_area() and vfree()) and fs/proc/kcore.c. + * Internals. Dont't use.. */ extern rwlock_t vmlist_lock; +extern struct vm_struct *vmlist; -extern struct vm_struct * vmlist; -#endif - +#endif /* _LINUX_VMALLOC_H */ -- cgit v1.2.3