/******************************************************************************* | |
* Copyright (c) 2006-2015 Cadence Design Systems Inc. | |
* | |
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* the following conditions: | |
* | |
* The above copyright notice and this permission notice shall be included | |
* in all copies or substantial portions of the Software. | |
* | |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
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******************************************************************************/ | |
/****************************************************************************** | |
* Xtensa-specific interrupt and exception functions for RTOS ports. | |
* Also see xtensa_intr_asm.S. | |
******************************************************************************/ | |
#include <stdlib.h> | |
#include <xtensa/config/core.h> | |
#include "freertos/FreeRTOS.h" | |
#include "freertos/xtensa_api.h" | |
#include "freertos/portable.h" | |
#include "rom/ets_sys.h" | |
#if XCHAL_HAVE_EXCEPTIONS | |
/* Handler table is in xtensa_intr_asm.S */ | |
extern xt_exc_handler _xt_exception_table[ XCHAL_EXCCAUSE_NUM * portNUM_PROCESSORS ]; | |
/* | |
* Default handler for unhandled exceptions. | |
* CHANGED: We do this in panic.c now | |
*/ | |
/*void xt_unhandled_exception(XtExcFrame *frame) */ | |
/*{ */ | |
/*exit(-1); */ | |
/*} */ | |
extern void xt_unhandled_exception( XtExcFrame * frame ); | |
/* | |
* This function registers a handler for the specified exception. | |
* The function returns the address of the previous handler. | |
* On error, it returns 0. | |
*/ | |
xt_exc_handler xt_set_exception_handler( int n, | |
xt_exc_handler f ) | |
{ | |
xt_exc_handler old; | |
if( ( n < 0 ) || ( n >= XCHAL_EXCCAUSE_NUM ) ) | |
{ | |
return 0; /* invalid exception number */ | |
} | |
/* Convert exception number to _xt_exception_table name */ | |
n = n * portNUM_PROCESSORS + xPortGetCoreID(); | |
old = _xt_exception_table[ n ]; | |
if( f ) | |
{ | |
_xt_exception_table[ n ] = f; | |
} | |
else | |
{ | |
_xt_exception_table[ n ] = &xt_unhandled_exception; | |
} | |
return( ( old == &xt_unhandled_exception ) ? 0 : old ); | |
} | |
#endif /* if XCHAL_HAVE_EXCEPTIONS */ | |
#if XCHAL_HAVE_INTERRUPTS | |
/* Handler table is in xtensa_intr_asm.S */ | |
typedef struct xt_handler_table_entry | |
{ | |
void * handler; | |
void * arg; | |
} xt_handler_table_entry; | |
extern xt_handler_table_entry _xt_interrupt_table[ XCHAL_NUM_INTERRUPTS * portNUM_PROCESSORS ]; | |
/* | |
* Default handler for unhandled interrupts. | |
*/ | |
void xt_unhandled_interrupt( void * arg ) | |
{ | |
ets_printf( "Unhandled interrupt %d on cpu %d!\n", ( int ) arg, xPortGetCoreID() ); | |
} | |
/* | |
* This function registers a handler for the specified interrupt. The "arg" | |
* parameter specifies the argument to be passed to the handler when it is | |
* invoked. The function returns the address of the previous handler. | |
* On error, it returns 0. | |
*/ | |
xt_handler xt_set_interrupt_handler( int n, | |
xt_handler f, | |
void * arg ) | |
{ | |
xt_handler_table_entry * entry; | |
xt_handler old; | |
if( ( n < 0 ) || ( n >= XCHAL_NUM_INTERRUPTS ) ) | |
{ | |
return 0; /* invalid interrupt number */ | |
} | |
if( Xthal_intlevel[ n ] > XCHAL_EXCM_LEVEL ) | |
{ | |
return 0; /* priority level too high to safely handle in C */ | |
} | |
/* Convert exception number to _xt_exception_table name */ | |
n = n * portNUM_PROCESSORS + xPortGetCoreID(); | |
entry = _xt_interrupt_table + n; | |
old = entry->handler; | |
if( f ) | |
{ | |
entry->handler = f; | |
entry->arg = arg; | |
} | |
else | |
{ | |
entry->handler = &xt_unhandled_interrupt; | |
entry->arg = ( void * ) n; | |
} | |
return( ( old == &xt_unhandled_interrupt ) ? 0 : old ); | |
} | |
#if CONFIG_SYSVIEW_ENABLE | |
void * xt_get_interrupt_handler_arg( int n ) | |
{ | |
xt_handler_table_entry * entry; | |
if( ( n < 0 ) || ( n >= XCHAL_NUM_INTERRUPTS ) ) | |
{ | |
return 0; /* invalid interrupt number */ | |
} | |
/* Convert exception number to _xt_exception_table name */ | |
n = n * portNUM_PROCESSORS + xPortGetCoreID(); | |
entry = _xt_interrupt_table + n; | |
return entry->arg; | |
} | |
#endif /* if CONFIG_SYSVIEW_ENABLE */ | |
#endif /* XCHAL_HAVE_INTERRUPTS */ |