8186b52744
the LinuxKPI for accessing user-space memory in the kernel. Add functions to hold and wire physical page(s) based on a given range of user-space virtual addresses. Add functions to get and put a reference on, wire, hold, mark accessed, copy and dirty a physical page. Add new VM related structures and defines as a preparation step for advancing the memory map capabilities of the LinuxKPI. Add function to figure out if a virtual address was allocated using malloc(). Add function to convert a virtual kernel address into its physical page pointer. Obtained from: kmacy @ MFC after: 1 week Sponsored by: Mellanox Technologies
57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
/*-
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* Copyright (c) 2017 Mellanox Technologies, Ltd.
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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_PFN_T_H_
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#define _LINUX_PFN_T_H_
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#include <linux/mm.h>
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CTASSERT(PAGE_SHIFT > 4);
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#define PFN_FLAGS_MASK (((u64)(PAGE_SIZE - 1)) << (64 - PAGE_SHIFT))
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#define PFN_SG_CHAIN (1ULL << (64 - 1))
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#define PFN_SG_LAST (1ULL << (64 - 2))
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#define PFN_DEV (1ULL << (64 - 3))
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#define PFN_MAP (1ULL << (64 - 4))
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static inline pfn_t
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__pfn_to_pfn_t(unsigned long pfn, u64 flags)
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{
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pfn_t pfn_t = { pfn | (flags & PFN_FLAGS_MASK) };
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return (pfn_t);
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}
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static inline pfn_t
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pfn_to_pfn_t(unsigned long pfn)
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{
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return (__pfn_to_pfn_t (pfn, 0));
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}
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#endif /* _LINUX_PFN_T_H_ */
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