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[ac7d5ef0] | 1 | /* timerisr.s |
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| 2 | * |
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| 3 | * If required this ISR is used to bump a count of interval "overflow" |
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| 4 | * interrupts which have occurred since the timer was started. The |
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| 5 | * number of overflows is taken into account in the Read_timer() |
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| 6 | * routine if necessary. |
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| 7 | * |
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| 8 | * To reduce overhead this is best to be the "rawest" hardware interupt |
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| 9 | * handler you can write. This should be the only interrupt which can |
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| 10 | * occur during the measured time period. |
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| 11 | * |
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| 12 | * NOTE: This file is USUALLY in assembly and is LEAN AND MEAN. |
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| 13 | * Any code in this isr is pure overhead which can perturb |
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| 14 | * the accuracy of the Timing Test Suite. |
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| 15 | * |
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[08311cc3] | 16 | * COPYRIGHT (c) 1989-1999. |
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[ac7d5ef0] | 17 | * On-Line Applications Research Corporation (OAR). |
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| 18 | * |
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[98e4ebf5] | 19 | * The license and distribution terms for this file may be |
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| 20 | * found in the file LICENSE in this distribution or at |
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[03f2154e] | 21 | * http://www.OARcorp.com/rtems/license.html. |
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[ac7d5ef0] | 22 | * |
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| 23 | * $Id$ |
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| 24 | */ |
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| 25 | |
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| 26 | #include <rtems.h> |
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| 27 | |
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| 28 | extern rtems_unsigned32 _Timer_interrupts; |
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| 29 | |
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| 30 | void timerisr( void ) |
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| 31 | { |
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| 32 | /* |
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| 33 | * _Timer_interrupts += TIMER_BETWEEN_OVERFLOWS (usually in microseconds) |
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| 34 | * return from interrupt |
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| 35 | */ |
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| 36 | } |
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