2abd4f8581
On arm64 we currently use a non-posted write for device memory, however we should move to use posted writes. This is expected to work on most hardware, however we will need to support a non-posted option for some broken hardware. Reviewed by: imp, manu, bcr (manpage) Differential Revision: https://reviews.freebsd.org/D29722
54 lines
2.1 KiB
C
54 lines
2.1 KiB
C
/*-
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* Copyright (c) 2009 Alan L. Cox <alc@cs.rice.edu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_VM_H_
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#define _MACHINE_VM_H_
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/* Memory attribute configuration. */
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#define VM_MEMATTR_DEVICE_nGnRnE 0
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#define VM_MEMATTR_UNCACHEABLE 1
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#define VM_MEMATTR_WRITE_BACK 2
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#define VM_MEMATTR_WRITE_THROUGH 3
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#define VM_MEMATTR_DEVICE_nGnRE 4
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/*
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* VM_MEMATTR_DEVICE can be changed to VM_MEMATTR_DEVICE_nGnRE when
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* the PCI drivers use VM_MEMATTR_DEVICE_NP for their config space.
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*/
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#define VM_MEMATTR_DEVICE VM_MEMATTR_DEVICE_nGnRnE
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#define VM_MEMATTR_DEVICE_NP VM_MEMATTR_DEVICE_nGnRnE
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#ifdef _KERNEL
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/* If defined vmstat will try to use both of these in a switch statement */
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#define VM_MEMATTR_WRITE_COMBINING VM_MEMATTR_WRITE_THROUGH
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#endif
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#define VM_MEMATTR_DEFAULT VM_MEMATTR_WRITE_BACK
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#endif /* !_MACHINE_VM_H_ */
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