2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2009 Alan L. Cox <alc@cs.rice.edu>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
31 #ifndef _MACHINE_VM_H_
32 #define _MACHINE_VM_H_
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)
41 #define VM_MEMATTR_DEFAULT VM_MEMATTR_WB_WA
42 #define VM_MEMATTR_UNCACHEABLE VM_MEMATTR_SO /* misused by DMA */
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 */
49 /* Memory attribute configuration. */
50 #define VM_MEMATTR_DEFAULT 0
51 #define VM_MEMATTR_UNCACHEABLE 1
54 #endif /* !_MACHINE_VM_H_ */