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Slight tweak: Avoid needlessly purging cachelines which we've just flushed.

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This commit is contained in:
scw 2001-08-12 18:13:45 +00:00
parent 99c5195929
commit 7374ebbf8c
1 changed files with 12 additions and 8 deletions
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20
sys/arch/mvme68k/mvme68k/bus_dma.c
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@ -1,4 +1,4 @@
/* $NetBSD: bus_dma.c,v 1.17 2001/07/18 17:21:49 scw Exp $ */
/* $NetBSD: bus_dma.c,v 1.18 2001/08/12 18:13:45 scw Exp $ */
/*
* This file was taken from from next68k/dev/bus_dma.c, which was originally
@ -46,7 +46,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.17 2001/07/18 17:21:49 scw Exp $");
__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.18 2001/08/12 18:13:45 scw Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -540,13 +540,17 @@ _bus_dmamap_sync_0460(t, map, offset, len, ops)
* cachelines at the start and end of the required region.
*/
if (ops & BUS_DMASYNC_PREREAD) {
if (ps & 0xf)
DCFL_40(ps);
if (pe & 0xf)
DCFL_40(pe);
if (ps & 0xf) {
DCFL_40(ps & ~0xf);
ICPL_40(ps & ~0xf);
}
if (pe & 0xf) {
DCFL_40(pe & ~0xf);
ICPL_40(pe & ~0xf);
}
p = ps & ~0xf;
e = (pe + 15) & ~0xf;
p = (ps + 15) & ~0xf;
e = pe & ~0xf;
/* purge cache line */
while((p < e) && (p % NBPG)) {