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Insert a hack to allocate IOMMU addresses congruent to the kernel virtual 

address that being DVMAed to.
This commit is contained in:
pk 1997-09-27 17:49:33 +00:00
parent 8a3aef8a1a
commit 7482ebb584
1 changed files with 33 additions and 4 deletions
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37
sys/arch/sparc/sparc/vm_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.30 1997/03/10 23:55:40 pk Exp $ */
/* $NetBSD: vm_machdep.c,v 1.31 1997/09/27 17:49:33 pk Exp $ */
/*
* Copyright (c) 1996
@ -149,6 +149,8 @@ dvma_free(dva, len, kaddr)
free((void *)kva, M_DEVBUF);
}
u_long dvma_cachealign = 0;
/*
* Map a range [va, va+len] of wired virtual addresses in the given map
* to a kernel address in DVMA space.
@ -177,10 +179,37 @@ dvma_mapin(map, va, len, canwait)
s = splimp();
for (;;) {
pn = rmalloc(dvmamap, npf);
if (dvma_cachealign) {
int m = (dvma_cachealign >> PGSHIFT);
int palign = (va >> PGSHIFT) & (m - 1);
long basepn;
if (pn != 0)
break;
/*
* Find a DVMA address that's congruent to VA
* modulo the cache size. This needs only be
* done on machines with virtually indexed
* caches capable of DVMA coherency (eg. Hypersparc)
*
* XXX - there should be a better way..
*/
basepn = pn = rmalloc(dvmamap, npf + m - 1);
if (pn != 0) {
pn += (palign + 1 + m - pn) & (m - 1);
/* Free excess resources */
if (pn != basepn)
rmfree(dvmamap, pn - basepn, basepn);
if (pn != basepn + (m - 1))
rmfree(dvmamap, m - 1 - (pn - basepn),
pn + npf);
break;
}
} else {
pn = rmalloc(dvmamap, npf);
if (pn != 0)
break;
}
if (canwait) {
(void)tsleep(dvmamap, PRIBIO+1, "physio", 0);
continue;