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/*
* File: arch/blackfin/mach-common/cplbhdlr.S
* Based on:
* Author: LG Soft India
*
* Created: ?
* Description: CPLB exception handler
*
* Modified:
* Copyright 2004-2006 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* 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, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/linkage.h>
#include <asm/cplb.h>
#include <asm/entry.h>
#ifdef CONFIG_EXCPT_IRQ_SYSC_L1
.section .l1.text
#else
.text
#endif
.type _cplb_mgr, STT_FUNC;
.type _panic_cplb_error, STT_FUNC;
.align 2
ENTRY(__cplb_hdr)
R2 = SEQSTAT;
/* Mask the contents of SEQSTAT and leave only EXCAUSE in R2 */
R2 <<= 26;
R2 >>= 26;
R1 = 0x23; /* Data access CPLB protection violation */
CC = R2 == R1;
IF !CC JUMP .Lnot_data_write;
R0 = 2; /* is a write to data space*/
JUMP .Lis_icplb_miss;
.Lnot_data_write:
R1 = 0x2C; /* CPLB miss on an instruction fetch */
CC = R2 == R1;
R0 = 0; /* is_data_miss == False*/
IF CC JUMP .Lis_icplb_miss;
R1 = 0x26;
CC = R2 == R1;
IF !CC JUMP .Lunknown;
R0 = 1; /* is_data_miss == True*/
.Lis_icplb_miss:
#if defined(CONFIG_BFIN_ICACHE) || defined(CONFIG_BFIN_DCACHE)
# if defined(CONFIG_BFIN_ICACHE) && !defined(CONFIG_BFIN_DCACHE)
R1 = CPLB_ENABLE_ICACHE;
# endif
# if !defined(CONFIG_BFIN_ICACHE) && defined(CONFIG_BFIN_DCACHE)
R1 = CPLB_ENABLE_DCACHE;
# endif
# if defined(CONFIG_BFIN_ICACHE) && defined(CONFIG_BFIN_DCACHE)
R1 = CPLB_ENABLE_DCACHE | CPLB_ENABLE_ICACHE;
# endif
#else
R1 = 0;
#endif
[--SP] = RETS;
CALL _cplb_mgr;
RETS = [SP++];
CC = R0 == 0;
IF !CC JUMP .Lnot_replaced;
RTS;
/*
* Diagnostic exception handlers
*/
.Lunknown:
R0 = CPLB_UNKNOWN_ERR;
JUMP .Lcplb_error;
.Lnot_replaced:
CC = R0 == CPLB_NO_UNLOCKED;
IF !CC JUMP .Lnext_check;
R0 = CPLB_NO_UNLOCKED;
JUMP .Lcplb_error;
.Lnext_check:
CC = R0 == CPLB_NO_ADDR_MATCH;
IF !CC JUMP .Lnext_check2;
R0 = CPLB_NO_ADDR_MATCH;
JUMP .Lcplb_error;
.Lnext_check2:
CC = R0 == CPLB_PROT_VIOL;
IF !CC JUMP .Lstrange_return_from_cplb_mgr;
R0 = CPLB_PROT_VIOL;
JUMP .Lcplb_error;
.Lstrange_return_from_cplb_mgr:
IDLE;
CSYNC;
JUMP .Lstrange_return_from_cplb_mgr;
.Lcplb_error:
R1 = sp;
SP += -12;
call _panic_cplb_error;
SP += 12;
JUMP _handle_bad_cplb;
ENDPROC(__cplb_hdr)
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