freebsd-dev/sys/compat/linuxkpi/common/include/linux/uaccess.h
Johannes Lundberg 47e2723ad7 LinuxKPI: Update access_ok macro for v5.0.
Check LINUXKPI_VERSION macro for backwards compatibility.
It's recommended to update any drivers that depend on the older KPI
so we can deprecate < 5.0 code as we update to newer Linux version.
This patch is part of D19565

Reviewed by:	hps
Approved by:	imp (mentor), hps
MFC after:	1 week
2019-05-16 17:44:17 +00:00

97 lines
3.3 KiB
C

/*-
* Copyright (c) 2010 Isilon Systems, Inc.
* Copyright (c) 2010 iX Systems, Inc.
* Copyright (c) 2010 Panasas, Inc.
* Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
* Copyright (c) 2015 François Tigeot
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _LINUX_UACCESS_H_
#define _LINUX_UACCESS_H_
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/proc.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <linux/compiler.h>
#define VERIFY_READ VM_PROT_READ
#define VERIFY_WRITE VM_PROT_WRITE
#define __get_user(_x, _p) ({ \
int __err; \
__typeof(*(_p)) __x; \
__err = linux_copyin((_p), &(__x), sizeof(*(_p))); \
(_x) = __x; \
__err; \
})
#define __put_user(_x, _p) ({ \
__typeof(*(_p)) __x = (_x); \
linux_copyout(&(__x), (_p), sizeof(*(_p))); \
})
#define get_user(_x, _p) linux_copyin((_p), &(_x), sizeof(*(_p)))
#define put_user(_x, _p) __put_user(_x, _p)
#define clear_user(...) linux_clear_user(__VA_ARGS__)
#if defined(LINUXKPI_VERSION) && LINUXKPI_VERSION >= 50000
#define access_ok(a,b) linux_access_ok(a,b)
#else
#define access_ok(a,b,c) linux_access_ok(b,c)
#endif
extern int linux_copyin(const void *uaddr, void *kaddr, size_t len);
extern int linux_copyout(const void *kaddr, void *uaddr, size_t len);
extern size_t linux_clear_user(void *uaddr, size_t len);
extern int linux_access_ok(const void *uaddr, size_t len);
/*
* NOTE: Each pagefault_disable() call must have a corresponding
* pagefault_enable() call in the same scope. The former creates a new
* block and defines a temporary variable, and the latter uses the
* temporary variable and closes the block. Failure to balance the
* calls will result in a compile-time error.
*/
#define pagefault_disable(void) do { \
int __saved_pflags = \
vm_fault_disable_pagefaults()
#define pagefault_enable(void) \
vm_fault_enable_pagefaults(__saved_pflags); \
} while (0)
static inline bool
pagefault_disabled(void)
{
return ((curthread->td_pflags & TDP_NOFAULTING) != 0);
}
#endif /* _LINUX_UACCESS_H_ */