forked from Imagelibrary/rtems
132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
/**
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* @file
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*
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* @brief AVR CPU Dependent Source
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*/
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/*
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* COPYRIGHT (c) 1989-2008.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/system.h>
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#include <rtems/score/isr.h>
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#include <rtems/score/wkspace.h>
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#include <rtems/bspIo.h> /* XXX remove me later */
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void _CPU_Initialize(void)
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{
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/*
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* If there is not an easy way to initialize the FP context
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* during Context_Initialize, then it is usually easier to
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* save an "uninitialized" FP context here and copy it to
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* the task's during Context_Initialize.
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*/
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/* FP context initialization support goes here */
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}
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uint32_t _CPU_ISR_Get_level( void )
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{
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/*
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* This routine returns the current interrupt level.
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*/
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if((SREG & 0x80))return 1;
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else return 0;
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}
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/*
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* _CPU_ISR_install_raw_handler
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*
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* NO_CPU Specific Information:
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*
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* XXX document implementation including references if appropriate
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*/
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void _CPU_ISR_install_raw_handler(
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uint32_t vector,
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proc_ptr new_handler,
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proc_ptr *old_handler
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)
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{
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/*
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* This is where we install the interrupt handler into the "raw" interrupt
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* table used by the CPU to dispatch interrupt handlers.
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*/
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}
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void _CPU_ISR_install_vector(
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uint32_t vector,
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proc_ptr new_handler,
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proc_ptr *old_handler
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)
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{
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*old_handler = _ISR_Vector_table[ vector ];
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/*
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* If the interrupt vector table is a table of pointer to isr entry
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* points, then we need to install the appropriate RTEMS interrupt
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* handler for this vector number.
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*/
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_CPU_ISR_install_raw_handler( vector, new_handler, old_handler );
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/*
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* We put the actual user ISR address in '_ISR_vector_table'. This will
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* be used by the _ISR_Handler so the user gets control.
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*/
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_ISR_Vector_table[ vector ] = new_handler;
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}
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/*
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* _CPU_Install_interrupt_stack
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*
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* NO_CPU Specific Information:
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*
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* XXX document implementation including references if appropriate
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*/
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void _CPU_Install_interrupt_stack( void )
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{
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}
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/*
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* _CPU_Thread_Idle_body
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*
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* NOTES:
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*
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* 1. This is the same as the regular CPU independent algorithm.
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*
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* 2. If you implement this using a "halt", "idle", or "shutdown"
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* instruction, then don't forget to put it in an infinite loop.
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*
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* 3. Be warned. Some processors with onboard DMA have been known
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* to stop the DMA if the CPU were put in IDLE mode. This might
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* also be a problem with other on-chip peripherals. So use this
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* hook with caution.
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*
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* NO_CPU Specific Information:
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*
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* XXX document implementation including references if appropriate
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*/
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void *_CPU_Thread_Idle_body( uintptr_t ignored )
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{
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for( ; ; ) __asm__ volatile ("sleep"::);
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/* insert your "halt" instruction here */ ;
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return (void *) 0;
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}
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