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810ea5b270
pairwise to support the FreeBSD way of pushing and popping the page fault flags. Ensure this by requiring every occurrence of pagefault disable function call to have a corresponding pagefault enable call. Obtained from: kmacy @ MFC after: 1 week Sponsored by: Mellanox Technologies
84 lines
2.9 KiB
C
84 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) 2013-2016 Mellanox Technologies, Ltd.
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* Copyright (c) 2015 François Tigeot
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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_UACCESS_H_
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#define _LINUX_UACCESS_H_
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <linux/compiler.h>
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#define VERIFY_READ VM_PROT_READ
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#define VERIFY_WRITE VM_PROT_WRITE
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#define __get_user(_x, _p) ({ \
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int __err; \
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__typeof(*(_p)) __x; \
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__err = linux_copyin((_p), &(__x), sizeof(*(_p))); \
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(_x) = __x; \
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__err; \
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})
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#define __put_user(_x, _p) ({ \
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__typeof(*(_p)) __x = (_x); \
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linux_copyout(&(__x), (_p), sizeof(*(_p))); \
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})
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#define get_user(_x, _p) linux_copyin((_p), &(_x), sizeof(*(_p)))
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#define put_user(_x, _p) linux_copyout(&(_x), (_p), sizeof(*(_p)))
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#define clear_user(...) linux_clear_user(__VA_ARGS__)
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#define access_ok(...) linux_access_ok(__VA_ARGS__)
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extern int linux_copyin(const void *uaddr, void *kaddr, size_t len);
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extern int linux_copyout(const void *kaddr, void *uaddr, size_t len);
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extern size_t linux_clear_user(void *uaddr, size_t len);
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extern int linux_access_ok(int rw, const void *uaddr, size_t len);
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#define pagefault_disable(void) do { \
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int __saved_pflags = \
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vm_fault_disable_pagefaults()
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#define pagefault_enable(void) \
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vm_fault_enable_pagefaults(__saved_pflags); \
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} while (0)
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static inline bool
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pagefault_disabled(void)
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{
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return ((curthread->td_pflags & TDP_NOFAULTING) != 0);
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}
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#endif /* _LINUX_UACCESS_H_ */
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