forked from Imagelibrary/rtems
7ee5931393
The aim of this clock driver hook was to stop clock tick interrupts at some late point in the exit() procedure. The use of atexit() pulls in malloc() which pulls in errno. It is incompatible with the intention of the CONFIGURE_DISABLE_NEWLIB_REENTRANCY configuration option. The exit() function must be called from thread context, so accompanied clock tick interrupts should cause no harm. On the contrary, someone may assume a normal operating system operation, e.g. working timeouts. Remove the Clock_driver_support_shutdown_hardware() clock driver hook. Close #3436.
128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/*
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* This routine initializes the Real Time Clock Counter Timer which is
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* part of the MEC on the ERC32 CPU.
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*
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* The tick frequency is directly programmed to the configured number of
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* microseconds per tick.
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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.org/license/LICENSE.
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*
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* Ported to ERC32 implementation of the SPARC by On-Line Applications
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* Research Corporation (OAR) under contract to the European Space
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* Agency (ESA).
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*
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* ERC32 modifications of respective RTEMS file: COPYRIGHT (c) 1995.
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* European Space Agency.
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*/
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#include <bsp.h>
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#include <bspopts.h>
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#include <rtems/counter.h>
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#include <rtems/timecounter.h>
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#include <rtems/score/sparcimpl.h>
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#define ERC32_REAL_TIME_CLOCK_FREQUENCY 1000000
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/*
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* The Real Time Clock Counter Timer uses this trap type.
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*/
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#define CLOCK_VECTOR ERC32_TRAP_TYPE( ERC32_INTERRUPT_REAL_TIME_CLOCK )
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#define Clock_driver_support_install_isr( _new ) \
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set_vector( _new, CLOCK_VECTOR, 1 )
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#define Clock_driver_support_set_interrupt_affinity( _online_processors ) \
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do { \
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(void) _online_processors; \
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} while (0)
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extern int CLOCK_SPEED;
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static rtems_timecounter_simple erc32_tc;
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static uint32_t erc32_tc_get( rtems_timecounter_simple *tc )
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{
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return ERC32_MEC.Real_Time_Clock_Counter;
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}
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static bool erc32_tc_is_pending( rtems_timecounter_simple *tc )
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{
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return ERC32_Is_interrupt_pending( ERC32_INTERRUPT_REAL_TIME_CLOCK );
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}
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static uint32_t erc32_tc_get_timecount( struct timecounter *tc )
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{
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return rtems_timecounter_simple_downcounter_get(
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tc,
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erc32_tc_get,
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erc32_tc_is_pending
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);
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}
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static void erc32_tc_at_tick( rtems_timecounter_simple *tc )
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{
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/* Nothing to do */
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}
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static void erc32_tc_tick( void )
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{
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rtems_timecounter_simple_downcounter_tick(
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&erc32_tc,
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erc32_tc_get,
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erc32_tc_at_tick
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);
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}
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static void erc32_counter_initialize( void )
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{
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_SPARC_Counter_initialize(
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_SPARC_Counter_read_address,
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_SPARC_Counter_difference_clock_period,
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&ERC32_MEC.Real_Time_Clock_Counter
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);
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}
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uint32_t _CPU_Counter_frequency(void)
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{
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return ERC32_REAL_TIME_CLOCK_FREQUENCY;
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}
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#define Clock_driver_support_initialize_hardware() \
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do { \
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/* approximately 1 us per countdown */ \
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ERC32_MEC.Real_Time_Clock_Scalar = CLOCK_SPEED - 1; \
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ERC32_MEC.Real_Time_Clock_Counter = \
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rtems_configuration_get_microseconds_per_tick(); \
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\
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ERC32_MEC_Set_Real_Time_Clock_Timer_Control( \
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ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING | \
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ERC32_MEC_TIMER_COUNTER_LOAD_SCALER | \
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ERC32_MEC_TIMER_COUNTER_LOAD_COUNTER \
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); \
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\
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ERC32_MEC_Set_Real_Time_Clock_Timer_Control( \
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ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING | \
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ERC32_MEC_TIMER_COUNTER_RELOAD_AT_ZERO \
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); \
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rtems_timecounter_simple_install( \
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&erc32_tc, \
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ERC32_REAL_TIME_CLOCK_FREQUENCY, \
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rtems_configuration_get_microseconds_per_tick(), \
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erc32_tc_get_timecount \
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); \
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erc32_counter_initialize(); \
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} while (0)
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#define Clock_driver_timecounter_tick() erc32_tc_tick()
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#include "../../../shared/dev/clock/clockimpl.h"
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SPARC_COUNTER_DEFINITION;
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