diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/i386ex/timer/timerisr.S')
| -rw-r--r-- | c/src/lib/libbsp/i386/i386ex/timer/timerisr.S | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/i386/i386ex/timer/timerisr.S b/c/src/lib/libbsp/i386/i386ex/timer/timerisr.S new file mode 100644 index 0000000000..53463e1e70 --- /dev/null +++ b/c/src/lib/libbsp/i386/i386ex/timer/timerisr.S @@ -0,0 +1,40 @@ +/* timer_isr() + * + * This routine provides the ISR for the Z8036 timer on the MVME136 + * board. 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 $250, SYM (Ttimer_val) # another 250 microseconds + pushl eax + movb 0xa0,al /* signal generic End Of Interrupt (EOI) to slave PIC */ + outb al, $0x20 + movb $0x20, al + outb al, $0x20 /* signal generic EOI to Master PIC */ + popl eax + iret + +END_CODE +END |