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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [no_cpu/] [no_bsp/] [timer/] [timerisr.c] - Rev 173
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/* timerisr.s * * If required this ISR is used to bump a count of interval "overflow" * interrupts which have occurred since the timer was started. The * number of overflows is taken into account in the Read_timer() * routine if necessary. * * To reduce overhead this is best to be the "rawest" hardware interupt * handler you can write. This should be the only interrupt which can * occur during the measured time period. * * NOTE: This file is USUALLY in assembly and is LEAN AND MEAN. * Any code in this isr is pure overhead which can perturb * the accuracy of the Timing Test Suite. * * 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: timerisr.c,v 1.2 2001-09-27 12:00:27 chris Exp $ */ #include <rtems.h> extern rtems_unsigned32 _Timer_interrupts; void timerisr( void ) { /* * _Timer_interrupts += TIMER_BETWEEN_OVERFLOWS (usually in microseconds) * return from interrupt */ }