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/* Copyright (C) 2003 Analog Devices, Inc. All Rights Reserved.
*
* This file is subject to the terms and conditions of the GNU General Public
* License.
*
* Blackfin BF533/2.6 support : LG Soft India
*/
/* Include an exception handler to invoke the CPLB manager
*/
#include <asm-blackfin/linkage.h>
#include <asm/cplb.h>
#include <asm/entry.h>
.text
.globl _cplb_hdr;
.type _cplb_hdr, STT_FUNC;
.extern _cplb_mgr;
.type _cplb_mgr, STT_FUNC;
.extern __unknown_exception_occurred;
.type __unknown_exception_occurred, STT_FUNC;
.extern __cplb_miss_all_locked;
.type __cplb_miss_all_locked, STT_FUNC;
.extern __cplb_miss_without_replacement;
.type __cplb_miss_without_replacement, STT_FUNC;
.extern __cplb_protection_violation;
.type __cplb_protection_violation, STT_FUNC;
.extern panic_pv;
.align 2;
ENTRY(_cplb_hdr)
SSYNC;
[--SP] = ( R7:0, P5:0 );
[--SP] = ASTAT;
[--SP] = SEQSTAT;
[--SP] = I0;
[--SP] = I1;
[--SP] = I2;
[--SP] = I3;
[--SP] = LT0;
[--SP] = LB0;
[--SP] = LC0;
[--SP] = LT1;
[--SP] = LB1;
[--SP] = LC1;
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 not_data_write;
R0 = 2; /* is a write to data space*/
JUMP is_icplb_miss;
not_data_write:
R1 = 0x2C; /* CPLB miss on an instruction fetch */
CC = R2 == R1;
R0 = 0; /* is_data_miss == False*/
IF CC JUMP is_icplb_miss;
R1 = 0x26;
CC = R2 == R1;
IF !CC JUMP unknown;
R0 = 1; /* is_data_miss == True*/
is_icplb_miss:
#if ( defined (CONFIG_BLKFIN_CACHE) || defined (CONFIG_BLKFIN_DCACHE))
#if ( defined (CONFIG_BLKFIN_CACHE) && !defined (CONFIG_BLKFIN_DCACHE))
R1 = CPLB_ENABLE_ICACHE;
#endif
#if ( !defined (CONFIG_BLKFIN_CACHE) && defined (CONFIG_BLKFIN_DCACHE))
R1 = CPLB_ENABLE_DCACHE;
#endif
#if ( defined (CONFIG_BLKFIN_CACHE) && defined (CONFIG_BLKFIN_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 not_replaced;
LC1 = [SP++];
LB1 = [SP++];
LT1 = [SP++];
LC0 = [SP++];
LB0 = [SP++];
LT0 = [SP++];
I3 = [SP++];
I2 = [SP++];
I1 = [SP++];
I0 = [SP++];
SEQSTAT = [SP++];
ASTAT = [SP++];
( R7:0, P5:0 ) = [SP++];
RTS;
unknown:
[--SP] = RETS;
CALL __unknown_exception_occurred;
RETS = [SP++];
JUMP unknown;
not_replaced:
CC = R0 == CPLB_NO_UNLOCKED;
IF !CC JUMP next_check;
[--SP] = RETS;
CALL __cplb_miss_all_locked;
RETS = [SP++];
next_check:
CC = R0 == CPLB_NO_ADDR_MATCH;
IF !CC JUMP next_check2;
[--SP] = RETS;
CALL __cplb_miss_without_replacement;
RETS = [SP++];
JUMP not_replaced;
next_check2:
CC = R0 == CPLB_PROT_VIOL;
IF !CC JUMP strange_return_from_cplb_mgr;
[--SP] = RETS;
CALL __cplb_protection_violation;
RETS = [SP++];
JUMP not_replaced;
strange_return_from_cplb_mgr:
IDLE;
CSYNC;
JUMP strange_return_from_cplb_mgr;
/************************************
* Diagnostic exception handlers
*/
__cplb_miss_all_locked:
sp += -12;
R0 = CPLB_NO_UNLOCKED;
call panic_bfin;
SP += 12;
RTS;
__cplb_miss_without_replacement:
sp += -12;
R0 = CPLB_NO_ADDR_MATCH;
call panic_bfin;
SP += 12;
RTS;
__cplb_protection_violation:
sp += -12;
R0 = CPLB_PROT_VIOL;
call panic_bfin;
SP += 12;
RTS;
__unknown_exception_occurred:
/* This function is invoked by the default exception
* handler, if it does not recognise the kind of
* exception that has occurred. In other words, the
* default handler only handles some of the system's
* exception types, and it does not expect any others
* to occur. If your application is going to be using
* other kinds of exceptions, you must replace the
* default handler with your own, that handles all the
* exceptions you will use.
*
* Since there's nothing we can do, we just loop here
* at what we hope is a suitably informative label.
*/
IDLE;
do_not_know_what_to_do:
CSYNC;
JUMP __unknown_exception_occurred;
RTS;
.__unknown_exception_occurred.end:
.global __unknown_exception_occurred;
.type __unknown_exception_occurred, STT_FUNC;
panic_bfin:
RTS;
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