156 lines
4.5 KiB
C
156 lines
4.5 KiB
C
/* irq.c: Intel Interrupt simulator
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Copyright (c) 2010, William A. Beech
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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WILLIAM A. BEECH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of William A. Beech shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from William A. Beech.
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MODIFICATIONS:
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20 Sep 20 - Original file.
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NOTES:
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*/
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#include "system_defs.h"
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#define irq_NAME "Intel Interrupt Simulator"
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/* function prototypes */
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t_stat irq_svc(UNIT *uptr);
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t_stat irq_reset(DEVICE *dptr);
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void set_irq(int32 irq_num);
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void clr_irq(int32 irq_num);
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/* external function prototypes */
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//extern t_stat SBC_reset(DEVICE *dptr); /* reset the iSBC80/10 emulator */
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extern void set_cpuint(int32 irq_num);
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/* local globals */
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int32 mbirq = 0; /* set no multibus interrupts */
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static const char* irq_desc(DEVICE *dptr) {
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return irq_NAME;
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}
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/* external globals */
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extern uint8 xack; /* XACK signal */
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extern int32 irq_req; /* i8080 INT signal */
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extern uint16 PCX;
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extern DEVICE isbc064_dev;
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extern DEVICE isbc464_dev;
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/* multibus Standard SIMH Device Data Structures */
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UNIT irq_unit = {
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UDATA (&irq_svc, 0, 0), 1
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};
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REG irq_reg[] = {
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{ HRDATA (MBIRQ, mbirq, 32) },
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{ NULL }
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};
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DEBTAB irq_debug[] = {
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{ "ALL", DEBUG_all },
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{ "FLOW", DEBUG_flow },
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{ "READ", DEBUG_read },
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{ "WRITE", DEBUG_write },
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{ "LEV1", DEBUG_level1 },
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{ "LEV2", DEBUG_level2 },
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{ NULL }
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};
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DEVICE irq_dev = {
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"IRQ", //name
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&irq_unit, //units
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irq_reg, //registers
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NULL, //modifiers
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1, //numunits
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16, //aradix
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16, //awidth
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1, //aincr
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16, //dradix
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8, //dwidth
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NULL, //examine
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NULL, //deposit
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&irq_reset, //reset
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NULL, //boot
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NULL, //attach
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NULL, //detach
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NULL, //ctxt
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DEV_DEBUG, //flags
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0, //dctrl
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irq_debug, //debflags
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NULL, //msize
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NULL, //lname
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NULL, //help routine
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NULL, //attach help routine
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NULL, //help context
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&irq_desc //device description
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};
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/* Service routines to handle simulator functions */
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/* Reset routine */
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t_stat irq_reset(DEVICE *dptr)
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{
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// if (SBC_reset(NULL) == 0) {
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sim_printf(" Interrupt: Reset\n");
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sim_activate (&irq_unit, irq_unit.wait); /* activate unit */
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return SCPE_OK;
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// } else {
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// sim_printf(" Interrupt: SBC not selected\n");
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// return SCPE_OK;
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// }
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}
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/* service routine - actually does the simulated interrupts */
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t_stat irq_svc(UNIT *uptr)
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{
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switch (mbirq) {
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case INT_2:
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set_cpuint(INT_R);
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break;
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default:
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break;
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}
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sim_activate (&irq_unit, irq_unit.wait); /* continue poll */
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return SCPE_OK;
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}
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void set_irq(int32 irq_num)
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{
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mbirq |= irq_num;
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}
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void clr_irq(int32 irq_num)
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{
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mbirq &= ~irq_num;
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}
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/* end of irq.c */
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