diff options
Diffstat (limited to 'cpu/bf533/cplbhdlr.S')
| -rw-r--r-- | cpu/bf533/cplbhdlr.S | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/cpu/bf533/cplbhdlr.S b/cpu/bf533/cplbhdlr.S new file mode 100644 index 0000000..61be5bb --- /dev/null +++ b/cpu/bf533/cplbhdlr.S @@ -0,0 +1,193 @@ +/* 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; |