4.104.114.84.95
Last change
on this file since 7e642ba was
0162910,
checked in by Joel Sherrill <joel.sherrill@…>, on 12/14/98 at 23:15:38
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Patch from Ralf Corsepius <corsepiu@…> to rename all
.s files to .S in conformance with GNU conventions. This is a
minor step along the way to supporting automake.
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-
Property mode set to
100644
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File size:
710 bytes
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Rev | Line | |
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[9e86dd7d] | 1 | /* |
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| 2 | * Handle 68302 TIMER2 interrupts. |
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| 3 | * |
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| 4 | * All code in this routine is pure overhead which can perturb the |
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| 5 | * accuracy of RTEMS' timing test suite. |
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| 6 | * |
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| 7 | * See also: Read_timer() |
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| 8 | * |
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| 9 | * To reduce overhead this is best to be the "rawest" hardware interupt |
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| 10 | * handler you can write. This should be the only interrupt which can |
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| 11 | * occur during the measured time period. |
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| 12 | * |
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| 13 | * An external counter, Timer_interrupts, is incremented. |
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| 14 | * |
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| 15 | * $Id$ |
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| 16 | */ |
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| 17 | |
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| 18 | #include "asm.h" |
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| 19 | |
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| 20 | BEGIN_CODE |
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| 21 | PUBLIC(timerisr) |
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| 22 | SYM(timerisr): |
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| 23 | move.w #0x0040,SYM(m302)+2072 | clear interrupt in-service bit |
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| 24 | move.b #3,SYM(m302)+2137 | clear timer interrupt event register |
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| 25 | addq.l #1,SYM(Timer_interrupts) | increment timer value |
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| 26 | rte |
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| 27 | END_CODE |
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| 28 | END |
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