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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [unix/] [posix/] [clock/] [clock.c] - Rev 846
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/* Clock * * This routine generates clock ticks using standard POSIX services. * The tick frequency is specified by the bsp. * * COPYRIGHT (c) 1989-1999. * On-Line Applications Research Corporation (OAR). * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: clock.c,v 1.2 2001-09-27 12:01:14 chris Exp $ */ #include <bsp.h> #include <rtems/libio.h> #include <stdlib.h> void Clock_exit(void); volatile rtems_unsigned32 Clock_driver_ticks; rtems_unsigned32 Clock_driver_vector; /* * These are set by clock driver during its init */ rtems_device_major_number rtems_clock_major = ~0; rtems_device_minor_number rtems_clock_minor; void Install_clock(rtems_isr_entry clock_isr) { Clock_driver_ticks = 0; (void) set_vector( clock_isr, Clock_driver_vector, 1 ); _CPU_Start_clock( BSP_Configuration.microseconds_per_tick ); atexit(Clock_exit); } void Clock_isr(int vector) { Clock_driver_ticks++; rtems_clock_tick(); } /* * Called via atexit() * Remove the clock signal */ void Clock_exit(void) { _CPU_Stop_clock(); (void) set_vector( 0, Clock_driver_vector, 1 ); } rtems_device_driver Clock_initialize( rtems_device_major_number major, rtems_device_minor_number minor, void *pargp ) { Clock_driver_vector = _CPU_Get_clock_vector(); Install_clock((rtems_isr_entry) Clock_isr); /* * make major/minor avail to others such as shared memory driver */ rtems_clock_major = major; rtems_clock_minor = minor; return RTEMS_SUCCESSFUL; } rtems_device_driver Clock_control( rtems_device_major_number major, rtems_device_minor_number minor, void *pargp ) { rtems_unsigned32 isrlevel; rtems_libio_ioctl_args_t *args = pargp; if (args == 0) goto done; /* * This is hokey, but until we get a defined interface * to do this, it will just be this simple... */ if (args->command == rtems_build_name('I', 'S', 'R', ' ')) { Clock_isr(Clock_driver_vector); } else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) { rtems_interrupt_disable( isrlevel ); (void) set_vector( args->buffer, Clock_driver_vector, 1 ); rtems_interrupt_enable( isrlevel ); } done: return RTEMS_SUCCESSFUL; }
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