diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/go32/timer/timerisr.s')
| -rw-r--r-- | c/src/lib/libbsp/i386/go32/timer/timerisr.s | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/i386/go32/timer/timerisr.s b/c/src/lib/libbsp/i386/go32/timer/timerisr.s new file mode 100644 index 0000000000..d68c3a7940 --- /dev/null +++ b/c/src/lib/libbsp/i386/go32/timer/timerisr.s @@ -0,0 +1,39 @@ +# timer_isr() +# +# This routine provides the ISR for the timer. The timer is set up +# to generate an interrupt at maximum intervals. +# +# Input parameters: NONE +# +# Output parameters: NONE +# +# COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. +# On-Line Applications Research Corporation (OAR). +# All rights assigned to U.S. Government, 1994. +# +# This material may be reproduced by or for the U.S. Government pursuant +# to the copyright license under the clause at DFARS 252.227-7013. This +# notice must appear in all copies of this file and its derivatives. +# +# $Id$ +# + +#include "asm.h" + + BEGIN_CODE + + EXTERN(_Ttimer_val) + +SYM (_timerisr): + addl $250,_Ttimer_val # another 250 microseconds + push edx + push eax + movw $0x20,dx + mov edx,eax + outb al,(dx) # touch interrupt controller + pop eax + pop edx + iret + +END_CODE +END |