mirror of
https://github.com/opnsense/src.git
synced 2026-03-13 22:25:45 -04:00
60799897ea
The BUSDMA buffer is treated as normal memory during compilation and compiler is free to inline/optimize basic functions (i.e. memset, memcpy) accessing buffers, including when an instruction is generated that performs a word access to unaligned data. We support this, but only if the buffer in question is mapped as normal memory (cached or not), but not to memory mapped as strongly ordered or device type. MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D47485 (cherry picked from commit 248109448f6afb3d093a522677aab2975a3e7a15)
46 lines
2 KiB
C
46 lines
2 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef _MACHINE_VM_H_
|
|
#define _MACHINE_VM_H_
|
|
|
|
#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_NOCACHE /* used by BUSDMA */
|
|
#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
|
|
|
|
#endif /* !_MACHINE_VM_H_ */
|