mm.h revision 219820
1/*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28#ifndef _LINUX_MM_H_ 29#define _LINUX_MM_H_ 30 31#include <linux/spinlock.h> 32#include <linux/gfp.h> 33#include <linux/kernel.h> 34 35#define PAGE_ALIGN(x) ALIGN(x, PAGE_SIZE) 36 37struct vm_area_struct { 38 vm_offset_t vm_start; 39 vm_offset_t vm_end; 40 vm_offset_t vm_pgoff; 41 vm_paddr_t vm_pfn; /* PFN For mmap. */ 42 vm_memattr_t vm_page_prot; 43}; 44 45/* 46 * Compute log2 of the power of two rounded up count of pages 47 * needed for size bytes. 48 */ 49static inline int 50get_order(unsigned long size) 51{ 52 int order; 53 54 size = (size - 1) >> PAGE_SHIFT; 55 order = 0; 56 while (size) { 57 order++; 58 size >>= 1; 59 } 60 return (order); 61} 62 63static inline void * 64lowmem_page_address(struct page *page) 65{ 66 67 return page_address(page); 68} 69 70/* 71 * This only works via mmap ops. 72 */ 73static inline int 74io_remap_pfn_range(struct vm_area_struct *vma, 75 unsigned long addr, unsigned long pfn, unsigned long size, 76 vm_memattr_t prot) 77{ 78 vma->vm_page_prot = prot; 79 vma->vm_pfn = pfn; 80 81 return (0); 82} 83 84#endif /* _LINUX_MM_H_ */ 85