4.104.114.84.95
Last change
on this file since 9e738b65 was
9e738b65,
checked in by Joel Sherrill <joel.sherrill@…>, on 07/20/95 at 19:20:31
|
updating go32 to make timer more accurate
|
-
Property mode set to
100644
|
File size:
967 bytes
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Rev | Line | |
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[637df35] | 1 | # timer_isr() |
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| 2 | # |
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| 3 | # This routine provides the ISR for the timer. The timer is set up |
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| 4 | # to generate an interrupt at maximum intervals. |
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| 5 | # |
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| 6 | # Input parameters: NONE |
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| 7 | # |
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| 8 | # Output parameters: NONE |
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| 9 | # |
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| 10 | # COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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| 11 | # On-Line Applications Research Corporation (OAR). |
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| 12 | # All rights assigned to U.S. Government, 1994. |
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| 13 | # |
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| 14 | # This material may be reproduced by or for the U.S. Government pursuant |
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| 15 | # to the copyright license under the clause at DFARS 252.227-7013. This |
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| 16 | # notice must appear in all copies of this file and its derivatives. |
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| 17 | # |
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| 18 | # $Id$ |
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| 19 | # |
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| 20 | |
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| 21 | #include "asm.h" |
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| 22 | |
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| 23 | BEGIN_CODE |
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| 24 | |
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| 25 | EXTERN(_Ttimer_val) |
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| 26 | |
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[4ca27cf] | 27 | PUBLIC(timerisr) |
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| 28 | |
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[9e738b65] | 29 | SYM (timerisr): |
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| 30 | addl $250,_Ttimer_val # another 250 microseconds |
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| 31 | push edx |
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| 32 | push eax |
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| 33 | movw $0x20,dx |
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| 34 | mov edx,eax |
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| 35 | outb al,(dx) # touch interrupt controller |
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| 36 | pop eax |
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| 37 | pop edx |
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| 38 | iret |
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[637df35] | 39 | |
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| 40 | END_CODE |
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| 41 | END |
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