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When mapping a page with BUS_SPACE_NOCACHE, make sure to flush the 

physical page from the data cache.
This commit is contained in:
matt 2003-03-15 07:25:20 +00:00
parent 1d23f2f4ea
commit 7ad3fe6e03
1 changed files with 8 additions and 1 deletions
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9
sys/arch/powerpc/powerpc/bus_dma.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: bus_dma.c,v 1.6 2003/03/05 22:08:29 matt Exp $ */
/* $NetBSD: bus_dma.c,v 1.7 2003/03/15 07:25:20 matt Exp $ */
/*-
* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
@ -594,6 +594,13 @@ _bus_dmamem_map(t, segs, nsegs, size, kvap, flags)
addr += NBPG, va += NBPG, size -= NBPG) {
if (size == 0)
panic("_bus_dmamem_map: size botch");
/*
* If we are mapping nocache, flush the page from
* cache before we map it.
*/
if (flags & BUS_DMA_NOCACHE)
dcbf(addr, NBPG,
curcpu()->ci_ci.dcache_line_size);
pmap_kenter_pa(va, addr,
VM_PROT_READ | VM_PROT_WRITE |
PMAP_WIRED |