05d4f501dc
some associated helper functions in the LinuxKPI. Let the existing linux_alloc_current() function allocate and initialize the new structure and let linux_free_current() drop the refcount on the memory mapping structure. When the mm_struct's refcount reaches zero, the structure is freed. Obtained from: kmacy @ MFC after: 1 week Sponsored by: Mellanox Technologies
113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
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* Copyright (c) 2015 François Tigeot
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* Copyright (c) 2015 Matthew Dillon <dillon@backplane.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_MM_H_
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#define _LINUX_MM_H_
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#include <linux/spinlock.h>
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/mm_types.h>
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#define PAGE_ALIGN(x) ALIGN(x, PAGE_SIZE)
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struct vm_area_struct {
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vm_offset_t vm_start;
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vm_offset_t vm_end;
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vm_offset_t vm_pgoff;
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vm_paddr_t vm_pfn; /* PFN For mmap. */
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vm_size_t vm_len; /* length for mmap. */
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vm_memattr_t vm_page_prot;
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};
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/*
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* Compute log2 of the power of two rounded up count of pages
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* needed for size bytes.
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*/
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static inline int
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get_order(unsigned long size)
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{
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int order;
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size = (size - 1) >> PAGE_SHIFT;
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order = 0;
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while (size) {
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order++;
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size >>= 1;
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}
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return (order);
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}
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static inline void *
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lowmem_page_address(struct page *page)
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{
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return page_address(page);
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}
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/*
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* This only works via mmap ops.
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*/
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static inline int
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io_remap_pfn_range(struct vm_area_struct *vma,
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unsigned long addr, unsigned long pfn, unsigned long size,
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vm_memattr_t prot)
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{
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vma->vm_page_prot = prot;
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vma->vm_pfn = pfn;
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vma->vm_len = size;
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return (0);
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}
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static inline unsigned long
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vma_pages(struct vm_area_struct *vma)
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{
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return ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT);
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}
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#define offset_in_page(off) ((off) & (PAGE_SIZE - 1))
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static inline void
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set_page_dirty(struct vm_page *page)
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{
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vm_page_dirty(page);
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}
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static inline void
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get_page(struct vm_page *page)
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{
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vm_page_hold(page);
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}
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#endif /* _LINUX_MM_H_ */
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