[src/trunk]: src/sys/arch/sparc/sparc Arrange to call uvm_pageidlezero() from...

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

details:   https://anonhg.NetBSD.org/src/rev/8f20fb3902ef
branches:  trunk
changeset: 485547:8f20fb3902ef
user:      pk <pk%NetBSD.org@localhost>
date:      Sun Apr 30 21:32:44 2000 +0000

description:
Arrange to call uvm_pageidlezero() from idle loop.

diffstat:

 sys/arch/sparc/sparc/locore.s |  47 ++++++++++++++++++++++++++++++++++--------
 1 files changed, 38 insertions(+), 9 deletions(-)

diffs (82 lines):

diff -r f5b3aadc7a60 -r 8f20fb3902ef sys/arch/sparc/sparc/locore.s
--- a/sys/arch/sparc/sparc/locore.s     Sun Apr 30 21:29:16 2000 +0000
+++ b/sys/arch/sparc/sparc/locore.s     Sun Apr 30 21:32:44 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore.s,v 1.127 2000/03/21 12:47:02 pk Exp $  */
+/*     $NetBSD: locore.s,v 1.128 2000/04/30 21:32:44 pk Exp $  */
 
 /*
  * Copyright (c) 1996 Paul Kranenburg
@@ -4410,7 +4410,7 @@
        /*
         * Change pcb to idle u. area, i.e., set %sp to top of stack
         * and %psr to PSR_S|PSR_ET, and set cpcb to point to idle_u.
-        * Once we have left the old stack, we can call kmem_free to
+        * Once we have left the old stack, we can call exit2() to
         * destroy it.  Call it any sooner and the register windows
         * go bye-bye.
         */
@@ -4443,7 +4443,7 @@
 
        /*
         * Now fall through to `the last switch'.  %g6 was set to
-        * %hi(cpcb), but may have been clobbered in kmem_free,
+        * %hi(cpcb), but may have been clobbered in exit2(),
         * so all the registers described below will be set here.
         *
         * REGISTER USAGE AT THIS POINT:
@@ -4481,7 +4481,41 @@
        tst     %o3
        bnz,a   Lsw_scan
         wr     %g1, PIL_CLOCK << 8, %psr       ! (void) splclock();
-       b,a     1b
+
+       ! Check uvm.page_idle_zero
+       sethi   %hi(_C_LABEL(uvm) + UVM_PAGE_IDLE_ZERO), %o3
+       ld      [%o3 + %lo(_C_LABEL(uvm) + UVM_PAGE_IDLE_ZERO)], %o3
+       tst     %o3
+       bz      1b
+        nop
+
+       /*
+        * We must preserve several global registers across the call
+        * to uvm_pageidlezero().  Use the %ix registers for this, but
+        * since we might still be running in our our caller's frame
+        * (if we came here from cpu_switch()), we need to setup a
+        * frame first.
+        */
+       save    %sp, -CCFSZ, %sp
+       mov     %g1, %i0
+       mov     %g2, %i1
+       mov     %g4, %i2
+       mov     %g6, %i3
+       mov     %g7, %i4
+
+       ! zero some pages
+       call    _C_LABEL(uvm_pageidlezero)
+        nop
+
+       ! restore global registers again which are now
+       ! clobbered by uvm_pageidlezero()
+       mov     %i0, %g1
+       mov     %i1, %g2
+       mov     %i2, %g4
+       mov     %i3, %g6
+       mov     %i4, %g7
+       b       1b
+        restore
 
 Lsw_panic_rq:
        sethi   %hi(1f), %o0
@@ -4696,11 +4730,6 @@
        wr      %g2, PSR_ET, %psr       ! %psr = newpsr ^ PSR_ET;
        /* set new cpcb */
        st      %g5, [%g6 + %lo(cpcb)]  ! cpcb = newpcb;
-#if 0
-       /* XXX update masterpaddr too */
-       sethi   %hi(_C_LABEL(masterpaddr)), %g7
-       st      %g5, [%g7 + %lo(_C_LABEL(masterpaddr))]
-#endif
        ldd     [%g5 + PCB_SP], %o6     ! <sp,pc> = newpcb->pcb_<sp,pc>
        /* load window */
        ldd     [%sp + (0*8)], %l0