c031b4b01e
VM_MEMATTR_WRITE_COMBINING in the kernel. This fixes a bug where Xorg would use write back cached memory for its graphics buffers. This would produce artifacts on the screen as cachelines were written to memory. MFC after: 1 week Sponsored by: DARPA, AFRL
46 lines
1.8 KiB
C
46 lines
1.8 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_VM_H_
|
|
#define _MACHINE_VM_H_
|
|
|
|
/* Memory attribute configuration. */
|
|
#define VM_MEMATTR_DEVICE 0
|
|
#define VM_MEMATTR_UNCACHEABLE 1
|
|
#define VM_MEMATTR_WRITE_BACK 2
|
|
#define VM_MEMATTR_WRITE_THROUGH 3
|
|
|
|
#ifdef _KERNEL
|
|
/* If defined vmstat will try to use both of these in a switch statement */
|
|
#define VM_MEMATTR_WRITE_COMBINING VM_MEMATTR_WRITE_THROUGH
|
|
#endif
|
|
|
|
#define VM_MEMATTR_DEFAULT VM_MEMATTR_WRITE_BACK
|
|
|
|
#endif /* !_MACHINE_VM_H_ */
|