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Make pmap_prefer() also return a preferred virtual address when there's no

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associated physical page.
This commit is contained in:
pk 1995-12-05 23:01:39 +00:00
parent 801712f01a
commit 210b4d80ec
1 changed files with 17 additions and 9 deletions
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26
sys/arch/sparc/sparc/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.47 1995/07/05 18:52:32 pk Exp $ */
/* $NetBSD: pmap.c,v 1.48 1995/12/05 23:01:39 pk Exp $ */
/*
* Copyright (c) 1992, 1993
@ -3619,23 +3619,31 @@ pmap_prefer(pa, va)
register struct pvlist *pv;
register long m, d;
if (cputyp == CPU_SUN4M)
/* does the sun4m have the cache alias problem? */
return va;
m = CACHE_ALIAS_DIST;
if (m == 0) /* m=0 => no cache aliasing */
return (va);
if (pa == (vm_offset_t)-1) {
/*
* Do not consider physical address. Just return
* a cache aligned address.
*/
if (VA_INHOLE(va))
va = MMU_HOLE_END;
/* XXX - knowledge about `exec' formats; can we get by without? */
va -= USRTEXT;
va = (va + m - 1) & ~(m - 1);
return (va + USRTEXT);
}
if ((pa & (PMAP_TNC & ~PMAP_NC)) || !managed(pa))
return va;
pv = pvhead(pa);
if (pv->pv_pmap == NULL) {
#if 0
return ((va + m - 1) & ~(m - 1));
#else
/* Unusable, tell caller to try another one */
return (vm_offset_t)-1;
#endif
}
d = (long)(pv->pv_va & (m - 1)) - (long)(va & (m - 1));