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Simplify/speed up pagemove() somewhat by using the Virtual Page Table.

This commit is contained in:
thorpej 1998-03-09 20:17:03 +00:00
parent 78a173bada
commit e456fc0538
1 changed files with 15 additions and 21 deletions
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36
sys/arch/alpha/alpha/vm_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.31 1998/03/07 04:20:45 thorpej Exp $ */ /* $NetBSD: vm_machdep.c,v 1.32 1998/03/09 20:17:03 thorpej Exp $ */
/* /*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@ -31,7 +31,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.31 1998/03/07 04:20:45 thorpej Exp $"); __KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.32 1998/03/09 20:17:03 thorpej Exp $");
#include <sys/param.h> #include <sys/param.h>
#include <sys/systm.h> #include <sys/systm.h>
@ -325,42 +325,36 @@ cpu_swapout(p)
* Move pages from one kernel virtual address to another. * Move pages from one kernel virtual address to another.
* Both addresses are assumed to have valid page table pages * Both addresses are assumed to have valid page table pages
* and size must be a multiple of CLSIZE. * and size must be a multiple of CLSIZE.
*
* Note that since all kernel page table pages are pre-allocated
* and mapped in, we can use the Virtual Page Table.
*/ */
void void
pagemove(from, to, size) pagemove(from, to, size)
register caddr_t from, to; register caddr_t from, to;
size_t size; size_t size;
{ {
register pt_entry_t *fpte, *tpte; long fidx, tidx;
ssize_t todo; ssize_t todo;
if (size % CLBYTES) if (size % CLBYTES)
goto die; panic("pagemove");
todo = size; /* if testing > 0, need sign... */ todo = size; /* if testing > 0, need sign... */
while (todo > 0) { while (todo > 0) {
fidx = VPT_INDEX(from);
tidx = VPT_INDEX(to);
VPT[tidx] = VPT[fidx];
VPT[fidx] = 0;
ALPHA_TBIS((vm_offset_t)from); ALPHA_TBIS((vm_offset_t)from);
fpte = pmap_l3pte(pmap_kernel(), (vm_offset_t)from); ALPHA_TBIS((vm_offset_t)to);
tpte = pmap_l3pte(pmap_kernel(), (vm_offset_t)to);
#ifdef DIAGNOSTIC
if (fpte == NULL) {
printf("pagemove: no PT page for %p (from)\n", from);
goto die;
}
if (tpte == NULL) {
printf("pagemove: no PT page for %p (to)\n", to);
goto die;
}
#endif
*tpte = *fpte;
*fpte = 0;
todo -= NBPG; todo -= NBPG;
from += NBPG; from += NBPG;
to += NBPG; to += NBPG;
} }
return;
die:
panic("pagemove");
} }
extern vm_map_t phys_map; extern vm_map_t phys_map;