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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2009 Alan L. Cox <alc@cs.rice.edu>
      * 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, 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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: releng/12.0/sys/arm/include/vm.h 326258 2017-11-27 15:04:10Z pfg $
     */
    
    #ifndef _MACHINE_VM_H_
    #define _MACHINE_VM_H_
    
    #if __ARM_ARCH >= 6
    #define VM_MEMATTR_WB_WA                ((vm_memattr_t)0)
    #define VM_MEMATTR_NOCACHE              ((vm_memattr_t)1)
    #define VM_MEMATTR_DEVICE               ((vm_memattr_t)2)
    #define VM_MEMATTR_SO                   ((vm_memattr_t)3)
    #define VM_MEMATTR_WRITE_THROUGH        ((vm_memattr_t)4)
    
    #define VM_MEMATTR_DEFAULT              VM_MEMATTR_WB_WA
    #define VM_MEMATTR_UNCACHEABLE          VM_MEMATTR_SO   /* misused by DMA */
    #ifdef _KERNEL
    /* Don't export aliased VM_MEMATTR to userland */
    #define VM_MEMATTR_WRITE_COMBINING      VM_MEMATTR_WRITE_THROUGH /* for DRM */
    #define VM_MEMATTR_WRITE_BACK           VM_MEMATTR_WB_WA        /* for DRM */
    #endif
    #else
    /* Memory attribute configuration. */
    #define VM_MEMATTR_DEFAULT      0
    #define VM_MEMATTR_UNCACHEABLE  1
    #endif
    
    #endif /* !_MACHINE_VM_H_ */

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