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freebsd-nq/sys/arm/include/sf_buf.h

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Import FreeBSD/arm kernel bits. It only supports sa1110 (on simics) right now, but xscale support should come soon. Some of the initial work has been provided by : Stephane Potvin <sepotvin at videotron.ca> Most of this comes from NetBSD.
2004-05-14 11:46:45 +00:00
/*-
sys/arm: further adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
2017-11-27 15:04:10 +00:00
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
Import FreeBSD/arm kernel bits. It only supports sa1110 (on simics) right now, but xscale support should come soon. Some of the initial work has been provided by : Stephane Potvin <sepotvin at videotron.ca> Most of this comes from NetBSD.
2004-05-14 11:46:45 +00:00
* Copyright (c) 2003 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_SF_BUF_H_
#define _MACHINE_SF_BUF_H_
Merge all MD sf_buf allocators into one MI, residing in kern/subr_sfbuf.c The MD allocators were very common, however there were some minor differencies. These differencies were all consolidated in the MI allocator, under ifdefs. The defines from machine/vmparam.h turn on features required for a particular machine. For details look in the comment in sys/sf_buf.h. As result no MD code left in sys/*/*/vm_machdep.c. Some arches still have machine/sf_buf.h, which is usually quite small. Tested by: glebius (i386), tuexen (arm32), kevlo (arm32) Reviewed by: kib Sponsored by: Netflix Sponsored by: Nginx, Inc.
2014-08-05 09:44:10 +00:00
static inline void
sf_buf_map(struct sf_buf *sf, int flags)
Import FreeBSD/arm kernel bits. It only supports sa1110 (on simics) right now, but xscale support should come soon. Some of the initial work has been provided by : Stephane Potvin <sepotvin at videotron.ca> Most of this comes from NetBSD.
2004-05-14 11:46:45 +00:00
{
ARM: remove old pmap-v6 code. The new pmap-v6 is mature enough, and dual implementation is showstopper for major cleanup. This patch only removes old code from tree. Cleanups will follow asap.
2016-01-29 10:31:54 +00:00
#if __ARM_ARCH >= 6
New pmap code for armv6. Disabled by default, option ARM_NEW_PMAP enables it. This is pretty much a complete rewrite based on the existing i386 code. The patches have been circulating for a couple years and have been looked at by plenty of people, but I'm not putting anybody on the hook as having reviewed this in any formal sense except myself. After this has gotten wider testing from the user community, ARM_NEW_PMAP will become the default and various dregs of the old pmap code will be removed. Submitted by: Svatopluk Kraus <onwahe@gmail.com>, Michal Meloun <meloun@miracle.cz>
2015-03-26 21:13:53 +00:00
pmap_qenter(sf->kva, &(sf->m), 1);
#else
Merge all MD sf_buf allocators into one MI, residing in kern/subr_sfbuf.c The MD allocators were very common, however there were some minor differencies. These differencies were all consolidated in the MI allocator, under ifdefs. The defines from machine/vmparam.h turn on features required for a particular machine. For details look in the comment in sys/sf_buf.h. As result no MD code left in sys/*/*/vm_machdep.c. Some arches still have machine/sf_buf.h, which is usually quite small. Tested by: glebius (i386), tuexen (arm32), kevlo (arm32) Reviewed by: kib Sponsored by: Netflix Sponsored by: Nginx, Inc.
2014-08-05 09:44:10 +00:00
pmap_kenter(sf->kva, VM_PAGE_TO_PHYS(sf->m));
New pmap code for armv6. Disabled by default, option ARM_NEW_PMAP enables it. This is pretty much a complete rewrite based on the existing i386 code. The patches have been circulating for a couple years and have been looked at by plenty of people, but I'm not putting anybody on the hook as having reviewed this in any formal sense except myself. After this has gotten wider testing from the user community, ARM_NEW_PMAP will become the default and various dregs of the old pmap code will be removed. Submitted by: Svatopluk Kraus <onwahe@gmail.com>, Michal Meloun <meloun@miracle.cz>
2015-03-26 21:13:53 +00:00
#endif
Import FreeBSD/arm kernel bits. It only supports sa1110 (on simics) right now, but xscale support should come soon. Some of the initial work has been provided by : Stephane Potvin <sepotvin at videotron.ca> Most of this comes from NetBSD.
2004-05-14 11:46:45 +00:00
}
Merge all MD sf_buf allocators into one MI, residing in kern/subr_sfbuf.c The MD allocators were very common, however there were some minor differencies. These differencies were all consolidated in the MI allocator, under ifdefs. The defines from machine/vmparam.h turn on features required for a particular machine. For details look in the comment in sys/sf_buf.h. As result no MD code left in sys/*/*/vm_machdep.c. Some arches still have machine/sf_buf.h, which is usually quite small. Tested by: glebius (i386), tuexen (arm32), kevlo (arm32) Reviewed by: kib Sponsored by: Netflix Sponsored by: Nginx, Inc.
2014-08-05 09:44:10 +00:00
static inline int
sf_buf_unmap(struct sf_buf *sf)
Import FreeBSD/arm kernel bits. It only supports sa1110 (on simics) right now, but xscale support should come soon. Some of the initial work has been provided by : Stephane Potvin <sepotvin at videotron.ca> Most of this comes from NetBSD.
2004-05-14 11:46:45 +00:00
{
ARM: remove old pmap-v6 code. The new pmap-v6 is mature enough, and dual implementation is showstopper for major cleanup. This patch only removes old code from tree. Cleanups will follow asap.
2016-01-29 10:31:54 +00:00
#if __ARM_ARCH >= 6
Flush all kernel mappings from TLB(s) in time when they are cleared. Replace tlb_flush_local() by tlb_flush() as even not global mappings could be fetched to TLB(s) on other cores by speculative table walk. From OS point of view, it was not a problem as either such mappings were not used anymore or they were flushed from TLB(s) when reused. However, from hardware point of view, it was a problem. Not flushed mappings could be a target for speculative reads or prefetches (which might be quite aggresive on ARM cores). As speculative read can fill cacheline, it can cause a real problem, when physical page is reused, but mapped with different memory attributes. Anyhow, it's good to have only valid mappings in TLB(s). Approved by: kib (mentor)
2015-11-24 13:57:41 +00:00
pmap_qremove(sf->kva, 1);
#else
Merge all MD sf_buf allocators into one MI, residing in kern/subr_sfbuf.c The MD allocators were very common, however there were some minor differencies. These differencies were all consolidated in the MI allocator, under ifdefs. The defines from machine/vmparam.h turn on features required for a particular machine. For details look in the comment in sys/sf_buf.h. As result no MD code left in sys/*/*/vm_machdep.c. Some arches still have machine/sf_buf.h, which is usually quite small. Tested by: glebius (i386), tuexen (arm32), kevlo (arm32) Reviewed by: kib Sponsored by: Netflix Sponsored by: Nginx, Inc.
2014-08-05 09:44:10 +00:00
pmap_kremove(sf->kva);
Flush all kernel mappings from TLB(s) in time when they are cleared. Replace tlb_flush_local() by tlb_flush() as even not global mappings could be fetched to TLB(s) on other cores by speculative table walk. From OS point of view, it was not a problem as either such mappings were not used anymore or they were flushed from TLB(s) when reused. However, from hardware point of view, it was a problem. Not flushed mappings could be a target for speculative reads or prefetches (which might be quite aggresive on ARM cores). As speculative read can fill cacheline, it can cause a real problem, when physical page is reused, but mapped with different memory attributes. Anyhow, it's good to have only valid mappings in TLB(s). Approved by: kib (mentor)
2015-11-24 13:57:41 +00:00
#endif
Merge all MD sf_buf allocators into one MI, residing in kern/subr_sfbuf.c The MD allocators were very common, however there were some minor differencies. These differencies were all consolidated in the MI allocator, under ifdefs. The defines from machine/vmparam.h turn on features required for a particular machine. For details look in the comment in sys/sf_buf.h. As result no MD code left in sys/*/*/vm_machdep.c. Some arches still have machine/sf_buf.h, which is usually quite small. Tested by: glebius (i386), tuexen (arm32), kevlo (arm32) Reviewed by: kib Sponsored by: Netflix Sponsored by: Nginx, Inc.
2014-08-05 09:44:10 +00:00
return (1);
Import FreeBSD/arm kernel bits. It only supports sa1110 (on simics) right now, but xscale support should come soon. Some of the initial work has been provided by : Stephane Potvin <sepotvin at videotron.ca> Most of this comes from NetBSD.
2004-05-14 11:46:45 +00:00
}
#endif /* !_MACHINE_SF_BUF_H_ */
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