mm.h revision 270710
1217309Snwhitehorn/*- 2217309Snwhitehorn * Copyright (c) 2010 Isilon Systems, Inc. 3217309Snwhitehorn * Copyright (c) 2010 iX Systems, Inc. 4217309Snwhitehorn * Copyright (c) 2010 Panasas, Inc. 5217309Snwhitehorn * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6217309Snwhitehorn * All rights reserved. 7217309Snwhitehorn * 8217309Snwhitehorn * Redistribution and use in source and binary forms, with or without 9217309Snwhitehorn * modification, are permitted provided that the following conditions 10217309Snwhitehorn * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29#ifndef _LINUX_MM_H_ 30#define _LINUX_MM_H_ 31 32#include <linux/spinlock.h> 33#include <linux/gfp.h> 34#include <linux/kernel.h> 35 36#define PAGE_ALIGN(x) ALIGN(x, PAGE_SIZE) 37 38struct vm_area_struct { 39 vm_offset_t vm_start; 40 vm_offset_t vm_end; 41 vm_offset_t vm_pgoff; 42 vm_paddr_t vm_pfn; /* PFN For mmap. */ 43 vm_memattr_t vm_page_prot; 44}; 45 46/* 47 * Compute log2 of the power of two rounded up count of pages 48 * needed for size bytes. 49 */ 50static inline int 51get_order(unsigned long size) 52{ 53 int order; 54 55 size = (size - 1) >> PAGE_SHIFT; 56 order = 0; 57 while (size) { 58 order++; 59 size >>= 1; 60 } 61 return (order); 62} 63 64static inline void * 65lowmem_page_address(struct page *page) 66{ 67 68 return page_address(page); 69} 70 71/* 72 * This only works via mmap ops. 73 */ 74static inline int 75io_remap_pfn_range(struct vm_area_struct *vma, 76 unsigned long addr, unsigned long pfn, unsigned long size, 77 vm_memattr_t prot) 78{ 79 vma->vm_page_prot = prot; 80 vma->vm_pfn = pfn; 81 82 return (0); 83} 84 85#endif /* _LINUX_MM_H_ */ 86