7b17971146
when memory page caching attributes changed, and CPU does not support self-snoop, but implemented clflush, for i386. Take care of possible mappings of the page by sf buffer by utilizing the mapping for clflush, otherwise map the page transiently. Amd64 used direct map. Proposed and reviewed by: alc Approved by: re (kensmith)
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/*-
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* Copyright (c) 2003, 2005 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_SF_BUF_H_
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#define _MACHINE_SF_BUF_H_
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#include <sys/queue.h>
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struct vm_page;
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struct sf_buf {
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LIST_ENTRY(sf_buf) list_entry; /* list of buffers */
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TAILQ_ENTRY(sf_buf) free_entry; /* list of buffers */
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struct vm_page *m; /* currently mapped page */
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vm_offset_t kva; /* va of mapping */
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int ref_count; /* usage of this mapping */
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#ifdef SMP
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cpumask_t cpumask; /* cpus on which mapping is valid */
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#endif
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};
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static __inline vm_offset_t
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sf_buf_kva(struct sf_buf *sf)
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{
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return (sf->kva);
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}
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static __inline struct vm_page *
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sf_buf_page(struct sf_buf *sf)
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{
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return (sf->m);
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}
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boolean_t sf_buf_invalidate_cache(vm_page_t m);
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#endif /* !_MACHINE_SF_BUF_H_ */
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