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-rw-r--r--sim/h8300/perifs.c98
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diff --git a/sim/h8300/perifs.c b/sim/h8300/perifs.c
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-/* perfipheral simulation
-
- Written by Steve Chamberlain of Cygnus Support.
- sac@cygnus.com
-
- This file is part of H8/300 sim
-
-
- THIS SOFTWARE IS NOT COPYRIGHTED
-
- Cygnus offers the following for use in the public domain. Cygnus
- makes no warranty with regard to the software or it's performance
- and the user accepts the software "AS IS" with all faults.
-
- CYGNUS DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD TO
- THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
-
-*/
-
-/* Fake peripherals for the H8/330 */
-#include "state.h"
-
-/* This routine is called every few instructions to see if some sort
- of hardware event is needed */
-
-perifs( )
-{
- int interrupt = 0;
- int lval;
- int tmp;
- /* What to do about the 16 bit timer */
-
-
- /* Free running counter same as reg a */
- if (saved_state.reg[OCRA] == saved_state.reg[FRC])
- {
- /* Set the counter A overflow bit */
- saved_state.reg[TCSR] |= OCFA;
-
- if (saved_state.reg[TCSR] & CCLRA)
- {
- saved_state.reg[FRC] = 0;
- }
-
- if (saved_state.reg[TIER] & OCIEA)
- {
- interrupt = 16;
- }
- }
-
- /* Free running counter same as reg b */
- if (saved_state.reg[OCRB] == saved_state.reg[FRC])
- {
- saved_state.reg[TCSR] |= OCFB;
- if (saved_state.reg[TIER] & OCIEB)
- {
- interrupt = 17;
- }
- }
-
- /* inc free runnning counter */
- saved_state.reg[FRC]++;
-
- if (saved_state.reg[FRC] == 0)
- {
- /* Must have overflowed */
- saved_state.reg[TCSR] |= OVF;
- if (BYTE_MEM(TIER) & OVIE)
- interrupt = 18;
- }
-
- /* If we've had an interrupt and the bit is on */
- if (interrupt && saved_state.ienable)
- {
-
- int ccr;
-
- saved_state.ienable = 0;
- ccr = saved_state.reg[CCR];
- lval = WORD_MEM((interrupt)<<1);
- lval = WORD_MEM(lval);
- {
- /* Push PC */
- saved_state.reg[7] -= 2;
- tmp = saved_state.reg[7];
- SET_WORD_MEM (tmp, saved_state.reg[PC]);
- /* Push CCR twice */
- saved_state.reg[7] -=2 ;
- tmp = saved_state.reg[7];
- SET_BYTE_MEM(tmp,ccr);
- SET_BYTE_MEM(tmp+1,ccr);
-
- /* Set pc to point to first instruction of i vector */
- saved_state.reg[PC] = lval;
- }
- }
-}