[src/trunk]: src/sys/arch/mips/mips Change the way to implement zero copy dat...

[nisimura <nisimura%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/827fa777e7d6
branches:  trunk
changeset: 484986:827fa777e7d6
user:      nisimura <nisimura%NetBSD.org@localhost>
date:      Sun Apr 16 09:09:42 2000 +0000

description:
Change the way to implement zero copy data move in pagemove() using
MIPS_TBRPL().  It saves about 20 instructions to run for each
iteration, and avoids TLB polution.  Currently works for MIPS1 only
configuration.

diffstat:

 sys/arch/mips/mips/vm_machdep.c |  18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)

diffs (40 lines):

diff -r 49126590666d -r 827fa777e7d6 sys/arch/mips/mips/vm_machdep.c
--- a/sys/arch/mips/mips/vm_machdep.c   Sun Apr 16 09:00:26 2000 +0000
+++ b/sys/arch/mips/mips/vm_machdep.c   Sun Apr 16 09:09:42 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: vm_machdep.c,v 1.54 2000/04/12 01:37:58 nisimura Exp $ */
+/*     $NetBSD: vm_machdep.c,v 1.55 2000/04/16 09:09:42 nisimura Exp $ */
 
 /*
  * Copyright (c) 1988 University of Utah.
@@ -43,7 +43,7 @@
  */
 
 #include <sys/cdefs.h>                 /* RCS ID & Copyright macro defns */
-__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.54 2000/04/12 01:37:58 nisimura Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.55 2000/04/16 09:09:42 nisimura Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -294,11 +294,17 @@
 #endif
        invalid = (CPUISMIPS3) ? MIPS3_PG_NV | MIPS3_PG_G : MIPS1_PG_NV;
        while (size > 0) {
+               tpte->pt_entry = fpte->pt_entry;
+               fpte->pt_entry = invalid;
+#if defined(MIPS1) && !defined(MIPS3)
+       {
+               extern void mips1_TBRPL(vaddr_t, vaddr_t, p_addr_t);
+               mips1_TBRPL((vaddr_t)from, (vaddr_t)to, tpte->pt_entry);
+       }
+#else
                MIPS_TBIS((vaddr_t)from);
-               MachTLBUpdate((vaddr_t)to, fpte->pt_entry);     /* ??? */
-               *tpte = *fpte;
-               fpte->pt_entry = invalid;
-
+               MachTLBUpdate((vaddr_t)to, tpte->pt_entry);
+#endif
                fpte++; tpte++;
                size -= PAGE_SIZE;
                from += PAGE_SIZE;