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_bus_dmamem_unmap(): 

Sets the specified pages cacheable again because _bus_dmamem_map() might
change them uncacheable.
 The code was provided by Dhoyashiki-san in kern/19919.
This commit is contained in:
kent 2003-01-28 08:46:53 +00:00
parent a9119e2a88
commit 0b153da394
1 changed files with 22 additions and 2 deletions
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24
sys/arch/i386/i386/bus_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: bus_machdep.c,v 1.18 2003/01/28 01:07:52 kent Exp $ */
/* $NetBSD: bus_machdep.c,v 1.19 2003/01/28 08:46:53 kent Exp $ */
/*-
* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
@ -38,7 +38,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bus_machdep.c,v 1.18 2003/01/28 01:07:52 kent Exp $");
__KERNEL_RCSID(0, "$NetBSD: bus_machdep.c,v 1.19 2003/01/28 08:46:53 kent Exp $");
#include "opt_largepages.h"
@ -867,13 +867,33 @@ _bus_dmamem_unmap(t, kva, size)
caddr_t kva;
size_t size;
{
pt_entry_t *pte;
vaddr_t va, endva;
int cpumask;
int marked;
cpumask = 0;
marked = 0;
#ifdef DIAGNOSTIC
if ((u_long)kva & PGOFSET)
panic("_bus_dmamem_unmap");
#endif
size = round_page(size);
/*
* mark pages cacheable again.
*/
for (va = (vaddr_t)kva, endva = (vaddr_t)kva + size;
va < endva; va += PAGE_SIZE) {
pte = kvtopte(va);
if ((*pte & PG_N) != 0) {
*pte &= ~PG_N;
pmap_tlb_shootdown(pmap_kernel(), va, *pte, &cpumask);
marked = 1;
}
}
if (marked)
pmap_tlb_shootnow(cpumask);
uvm_km_free(kernel_map, (vaddr_t)kva, size);
}