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allow unaligned pointers in bus_dmamap_sync

This commit is contained in:
dbj 2001-06-16 09:08:05 +00:00
parent c57b6d9ba4
commit e9d708e25b
1 changed files with 13 additions and 3 deletions
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16
sys/arch/next68k/dev/bus_dma.c
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@ -1,4 +1,4 @@
/* $NetBSD: bus_dma.c,v 1.23 2001/05/28 22:11:45 chs Exp $ */
/* $NetBSD: bus_dma.c,v 1.24 2001/06/16 09:08:05 dbj Exp $ */
/*
* This file was taken from from alpha/common/bus_dma.c
@ -46,7 +46,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.23 2001/05/28 22:11:45 chs Exp $");
__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.24 2001/06/16 09:08:05 dbj Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -447,7 +447,6 @@ _bus_dmamap_sync(t, map, offset, len, ops)
int ops;
{
/* flush/purge the cache.
* assumes pointers are aligned
* @@@ should probably be fixed to use offset and len args.
*/
@ -456,6 +455,9 @@ _bus_dmamap_sync(t, map, offset, len, ops)
for(i=0;i<map->dm_nsegs;i++) {
bus_addr_t p = map->dm_segs[i].ds_addr;
bus_addr_t e = p+map->dm_segs[i].ds_len;
/* If the pointers are unaligned, it's ok to flush surrounding cache line */
p -= p%16;
if (e % 16) e += 16-(e%16);
#ifdef DIAGNOSTIC
if ((p % 16) || (e % 16)) {
panic("unaligned address in _bus_dmamap_sync while flushing.\n"
@ -488,6 +490,14 @@ _bus_dmamap_sync(t, map, offset, len, ops)
for(i=0;i<map->dm_nsegs;i++) {
bus_addr_t p = map->dm_segs[i].ds_addr;
bus_addr_t e = p+map->dm_segs[i].ds_len;
if (p % 16) {
p -= p%16;
DCFL(p);
}
if (e % 16) {
e += 16-(e%16);
DCFL(e-16);
}
#ifdef DIAGNOSTIC
if ((p % 16) || (e % 16)) {
panic("unaligned address in _bus_dmamap_sync while purging.\n"