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.
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/*
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* Clock device driver for Lattice Mico32 (lm32).
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*/
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/*
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* COPYRIGHT (c) 1989-2009.
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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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* Jukka Pietarinen <jukka.pietarinen@mrf.fi>, 2008,
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* Micro-Research Finland Oy
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*/
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#include <bsp.h>
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#include "../include/system_conf.h"
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#include "clock.h"
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#include "bspopts.h"
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#if LM32_ON_SIMULATOR
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#define CLOCK_DRIVER_USE_FAST_IDLE 1
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#endif
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static inline int clockread(unsigned int reg)
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{
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return *((int*)(TIMER0_BASE_ADDRESS + reg));
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}
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static inline void clockwrite(unsigned int reg, int value)
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{
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*((int*)(TIMER0_BASE_ADDRESS + reg)) = value;
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}
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/*
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* The interrupt vector number associated with the clock tick device
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* driver.
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*/
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#define CLOCK_VECTOR ( TIMER0_IRQ )
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#define CLOCK_IRQMASK ( 1 << CLOCK_VECTOR )
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#define Clock_driver_support_at_tick() \
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do { \
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/* Clear overflow flag */ \
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clockwrite(LM32_CLOCK_SR, 0); \
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lm32_interrupt_ack(CLOCK_IRQMASK); \
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} while (0)
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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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static void Clock_driver_support_initialize_hardware(void)
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{
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/* Set clock period */
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clockwrite(LM32_CLOCK_PERIOD,
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(CPU_FREQUENCY /
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(1000000 / rtems_configuration_get_microseconds_per_tick())));
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/* Enable clock interrupts and start in continuous mode */
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clockwrite(LM32_CLOCK_CR, LM32_CLOCK_CR_ITO |
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LM32_CLOCK_CR_CONT |
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LM32_CLOCK_CR_START);
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lm32_interrupt_unmask(CLOCK_IRQMASK);
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}
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#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
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#include "../../../shared/dev/clock/clockimpl.h"
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