b09e6b5c6e
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)
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/*-
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* Copyright (c) 2003 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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static inline void
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sf_buf_map(struct sf_buf *sf, int flags)
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{
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#ifdef ARM_NEW_PMAP
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pmap_qenter(sf->kva, &(sf->m), 1);
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#else
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pmap_kenter(sf->kva, VM_PAGE_TO_PHYS(sf->m));
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#endif
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}
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static inline int
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sf_buf_unmap(struct sf_buf *sf)
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{
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#ifdef ARM_NEW_PMAP
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pmap_qremove(sf->kva, 1);
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#else
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pmap_kremove(sf->kva);
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#endif
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return (1);
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}
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#endif /* !_MACHINE_SF_BUF_H_ */
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