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Make HTABSIZE calculation work with >1GB RAM.

This commit is contained in:
tsubai 2000-09-24 15:26:34 +00:00
parent 96232c1c4d
commit 4317291e1a
1 changed files with 17 additions and 7 deletions
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24
sys/arch/powerpc/powerpc/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.31 2000/09/13 15:00:22 thorpej Exp $ */
/* $NetBSD: pmap.c,v 1.32 2000/09/24 15:26:34 tsubai Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -397,13 +397,23 @@ pmap_bootstrap(kernelstart, kernelend)
}
}
#ifdef HTABENTS
/*
* The PEM recommends that the total number of PTEGs should be
* at least 1/2 of the number of physical pages.
*/
#ifdef HTABENTS
ptab_cnt = HTABENTS;
#else /* HTABENTS */
ptab_cnt = 1024;
while (btoc(HTABSIZE << 7) < physmem)
ptab_cnt <<= 1;
#endif /* HTABENTS */
#else
ptab_cnt = (physmem + 1) / 2;
/* The minimum is 1024 PTEGs. */
if (ptab_cnt < 1024)
ptab_cnt = 1024;
/* Round up to power of 2. */
asm ("cntlzw %0,%1" : "=r"(i) : "r"(ptab_cnt - 1));
ptab_cnt = 1 << (32 - i);
#endif
/*
* Find suitably aligned memory for HTAB.