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

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