forked from Imagelibrary/rtems
79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
/* Clock
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*
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* This routine generates clock ticks using standard POSIX services.
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* The tick frequency is specified by the bsp.
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*
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* COPYRIGHT (c) 1989-1999.
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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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* $Id$
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*/
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#include <bsp.h>
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#include <stdlib.h>
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void Clock_exit(void);
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volatile uint32_t Clock_driver_ticks;
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uint32_t Clock_driver_vector;
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/*
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* These are set by clock driver during its init
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*/
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rtems_device_major_number rtems_clock_major = ~0;
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rtems_device_minor_number rtems_clock_minor;
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void Install_clock(rtems_isr_entry clock_isr)
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{
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Clock_driver_ticks = 0;
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(void) set_vector( clock_isr, Clock_driver_vector, 1 );
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_CPU_Start_clock( rtems_configuration_get_microseconds_per_tick() );
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atexit(Clock_exit);
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}
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void Clock_isr(int vector)
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{
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Clock_driver_ticks++;
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rtems_clock_tick();
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}
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/*
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* Called via atexit()
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* Remove the clock signal
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*/
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void Clock_exit(void)
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{
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_CPU_Stop_clock();
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(void) set_vector( 0, Clock_driver_vector, 1 );
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}
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rtems_device_driver Clock_initialize(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp
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)
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{
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Clock_driver_vector = _CPU_Get_clock_vector();
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Install_clock((rtems_isr_entry) Clock_isr);
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/*
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* make major/minor avail to others such as shared memory driver
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*/
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rtems_clock_major = major;
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rtems_clock_minor = minor;
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return RTEMS_SUCCESSFUL;
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}
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