[src/trunk]: src/sys/arch/x68k/x68k Make NetBSD/x68k kernel work with 8KB/pag...

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

details:   https://anonhg.NetBSD.org/src/rev/7169fdd9a25a
branches:  trunk
changeset: 770244:7169fdd9a25a
user:      tsutsui <tsutsui%NetBSD.org@localhost>
date:      Sun Oct 09 08:51:56 2011 +0000

description:
Make NetBSD/x68k kernel work with 8KB/page (i.e. PGSHIFT==13) settings.

It's quite interesting to check ATC miss rate with both settings on XM6i,
as noted in XM6i presentation by isaki@ at OSC 2011 Hiroshima.

diffstat:

 sys/arch/x68k/x68k/locore.s |  10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diffs (33 lines):

diff -r 7509c48d84a3 -r 7169fdd9a25a sys/arch/x68k/x68k/locore.s
--- a/sys/arch/x68k/x68k/locore.s       Sun Oct 09 08:42:15 2011 +0000
+++ b/sys/arch/x68k/x68k/locore.s       Sun Oct 09 08:51:56 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore.s,v 1.103 2011/05/14 10:49:06 tsutsui Exp $     */
+/*     $NetBSD: locore.s,v 1.104 2011/10/09 08:51:56 tsutsui Exp $     */
 
 /*
  * Copyright (c) 1988 University of Utah.
@@ -870,7 +870,11 @@
        .long   0x4e7b0007              | movc d0,dtt1
        .word   0xf4d8                  | cinva bc
        .word   0xf518                  | pflusha
+#if PGSHIFT == 13
+       movl    #0xc000,%d0
+#else
        movl    #0x8000,%d0
+#endif
        .long   0x4e7b0003              | movc d0,tc
 #ifdef M68060
        RELOC(cputype, %a0)
@@ -887,7 +891,11 @@
        movc    %d0,%cacr               | turn on both caches
        jmp     Lenab1
 Lmotommu2:
+#if PGSHIFT == 13
+       movl    #0x82d08b00,%sp@-       | value to load TC with
+#else
        movl    #0x82c0aa00,%sp@-       | value to load TC with
+#endif
        pmove   %sp@,%tc                | load it
 
 /*