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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved.
*/
#include <asm/types.h>
#include <asm/sn/shub_mmr.h>
#define DEADLOCKBIT SH_PIO_WRITE_STATUS_WRITE_DEADLOCK_SHFT
#define WRITECOUNTMASK SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK
#define ALIAS_OFFSET 8
.global sn2_ptc_deadlock_recovery_core
.proc sn2_ptc_deadlock_recovery_core
sn2_ptc_deadlock_recovery_core:
.regstk 6,0,0,0
ptc0 = in0
data0 = in1
ptc1 = in2
data1 = in3
piowc = in4
zeroval = in5
piowcphy = r30
psrsave = r2
scr1 = r16
scr2 = r17
mask = r18
extr.u piowcphy=piowc,0,61;; // Convert piowc to uncached physical address
dep piowcphy=-1,piowcphy,63,1
movl mask=WRITECOUNTMASK
mov r8=r0
1:
add scr2=ALIAS_OFFSET,piowc // Address of WRITE_STATUS alias register
;;
ld8.acq scr1=[scr2];;
5: ld8.acq scr1=[piowc];; // Wait for PIOs to complete.
hint @pause
and scr2=scr1,mask;; // mask of writecount bits
cmp.ne p6,p0=zeroval,scr2
(p6) br.cond.sptk 5b
////////////// BEGIN PHYSICAL MODE ////////////////////
mov psrsave=psr // Disable IC (no PMIs)
rsm psr.i | psr.dt | psr.ic;;
srlz.i;;
st8.rel [ptc0]=data0 // Write PTC0 & wait for completion.
5: ld8.acq scr1=[piowcphy];; // Wait for PIOs to complete.
hint @pause
and scr2=scr1,mask;; // mask of writecount bits
cmp.ne p6,p0=zeroval,scr2
(p6) br.cond.sptk 5b;;
tbit.nz p8,p7=scr1,DEADLOCKBIT;;// Test for DEADLOCK
(p7) cmp.ne p7,p0=r0,ptc1;; // Test for non-null ptc1
(p7) st8.rel [ptc1]=data1;; // Now write PTC1.
5: ld8.acq scr1=[piowcphy];; // Wait for PIOs to complete.
hint @pause
and scr2=scr1,mask;; // mask of writecount bits
cmp.ne p6,p0=zeroval,scr2
(p6) br.cond.sptk 5b
tbit.nz p8,p0=scr1,DEADLOCKBIT;;// Test for DEADLOCK
mov psr.l=psrsave;; // Reenable IC
srlz.i;;
////////////// END PHYSICAL MODE ////////////////////
(p8) add r8=1,r8
(p8) br.cond.spnt 1b;; // Repeat if DEADLOCK occurred.
br.ret.sptk rp
.endp sn2_ptc_deadlock_recovery_core
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