The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/include/vm.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009 Alan L. Cox <alc@cs.rice.edu>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/12.0/sys/arm/include/vm.h 326258 2017-11-27 15:04:10Z pfg $
   29  */
   30 
   31 #ifndef _MACHINE_VM_H_
   32 #define _MACHINE_VM_H_
   33 
   34 #if __ARM_ARCH >= 6
   35 #define VM_MEMATTR_WB_WA                ((vm_memattr_t)0)
   36 #define VM_MEMATTR_NOCACHE              ((vm_memattr_t)1)
   37 #define VM_MEMATTR_DEVICE               ((vm_memattr_t)2)
   38 #define VM_MEMATTR_SO                   ((vm_memattr_t)3)
   39 #define VM_MEMATTR_WRITE_THROUGH        ((vm_memattr_t)4)
   40 
   41 #define VM_MEMATTR_DEFAULT              VM_MEMATTR_WB_WA
   42 #define VM_MEMATTR_UNCACHEABLE          VM_MEMATTR_SO   /* misused by DMA */
   43 #ifdef _KERNEL
   44 /* Don't export aliased VM_MEMATTR to userland */
   45 #define VM_MEMATTR_WRITE_COMBINING      VM_MEMATTR_WRITE_THROUGH /* for DRM */
   46 #define VM_MEMATTR_WRITE_BACK           VM_MEMATTR_WB_WA        /* for DRM */
   47 #endif
   48 #else
   49 /* Memory attribute configuration. */
   50 #define VM_MEMATTR_DEFAULT      0
   51 #define VM_MEMATTR_UNCACHEABLE  1
   52 #endif
   53 
   54 #endif /* !_MACHINE_VM_H_ */

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