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 | 41 |
1 files changed, 41 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..2e9ccf0dc7 --- /dev/null +++ b/c/src/lib/libbsp/i386/go32/timer/timerisr.S @@ -0,0 +1,41 @@ +/* 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) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * 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. + * + * $Id$ + */ + +#include "asm.h" + + BEGIN_CODE + + EXTERN(_Ttimer_val) + + PUBLIC(timerisr) + +SYM (timerisr): + addl $1,_Ttimer_val # another tick + push edx + push eax + movw $0x20,dx + mov edx,eax + outb al,(dx) # touch interrupt controller + pop eax + pop edx + iret + +END_CODE +END |