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/*
* Copyright (C) 2001 Broadcom Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/config.h>
#include <asm/asm.h>
#include <asm/regdef.h>
#include <asm/mipsregs.h>
#include <asm/stackframe.h>
#include <asm/sibyte/board.h>
.text
/* Special Cache Error handler for SB1 for now */
LEAF(except_vec2_sb1)
.set noat
.set mips0
/*
* This is a very bad place to be. Our cache error detection has
* triggered. If we have write-back data in the cache, we may not be
* able to recover. As a first-order desperate measure, turn off KSEG0
* cacheing.
*/
.set push
#.set mips64
.set mips4
.set reorder
mfc0 k1, $26 # mfc0 k1, $26, 0
# check if error was recoverable
# XXXKW - count them
bltz k1, leave_cerr
#ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
# look for signature of spurious CErr
lui k0, 0x4000
bne k0, k1, real_cerr
.word 0x401Bd801 # mfc0 k1, $27, 1
lui k0, 0xffe0
and k1, k0, k1
lui k0, 0x0200
beq k0, k1, leave_cerr
# XXXKW - count them
#endif
real_cerr:
mfc0 k0,CP0_CONFIG
li k1,~CONF_CM_CMASK
and k0,k0,k1
ori k0,k0,CONF_CM_UNCACHED
mtc0 k0,CP0_CONFIG
SSNOP
SSNOP
SSNOP
SSNOP
bnezl $0, 1f
1:
mfc0 k0, CP0_STATUS
sll k0, k0, 3 # check CU0 (kernel?)
bltz k0, 2f
GET_SAVED_SP
move sp, k0 # want Kseg SP (so uncached)
2:
j sb1_cache_error
leave_cerr:
# clear/unlock the registers
mtc0 zero, $26 # mtc0 zero, $26, 0
mtc0 zero, $27 # mtc0 zero, $27, 0
.word 0x4080d801 # mtc0 zero, $27, 1
.word 0x4080d803 # mtc0 zero, $27, 3
eret
.set pop
END(except_vec2_sb1)
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