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315 lines
12 KiB
C
315 lines
12 KiB
C
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/*
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* interrupt.h - Implementation of 6510 interrupts and alarms.
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*
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* Written by
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* Ettore Perazzoli <ettore@comm2000.it>
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* Andr<EFBFBD> Fachat <fachat@physik.tu-chemnitz.de>
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* Andreas Boose <viceteam@t-online.de>
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*
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* This file is part of VICE, the Versatile Commodore Emulator.
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* See README for copyright notice.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA.
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*
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*/
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#ifndef _INTERRUPT_H
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#define _INTERRUPT_H
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#include <stdio.h>
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#include "..\CommonVICE\types.h"
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/* Define the number of cycles needed by the CPU to detect the NMI or IRQ. */
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#define INTERRUPT_DELAY 2
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#define INTRRUPT_MAX_DMA_PER_OPCODE (7+10000)
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/* These are the available types of interrupt lines. */
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enum cpu_int {
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IK_NONE = 0,
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IK_NMI = 1 << 0,
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IK_IRQ = 1 << 1,
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IK_RESET = 1 << 2,
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IK_TRAP = 1 << 3,
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IK_MONITOR = 1 << 4,
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IK_DMA = 1 << 5,
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IK_IRQPEND = 1 << 6
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};
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struct interrupt_cpu_status_s {
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/* Number of interrupt lines. */
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unsigned int num_ints;
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/* Define, for each interrupt source, whether it has a pending interrupt
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(IK_IRQ, IK_NMI, IK_RESET and IK_TRAP) or not (IK_NONE). */
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unsigned int *pending_int;
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/* Name for each interrupt source */
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char **int_name;
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/* Number of active IRQ lines. */
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int nirq;
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/* Tick when the IRQ was triggered. */
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CLOCK irq_clk;
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/* Number of active NMI lines. */
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int nnmi;
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/* Tick when the NMI was triggered. */
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CLOCK nmi_clk;
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/* If an opcode is intercepted by a DMA, save the number of cycles
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left at the start of this particular DMA (needed by *_set_irq() to
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calculate irq_clk). */
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unsigned int num_dma_per_opcode;
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unsigned int num_cycles_left[INTRRUPT_MAX_DMA_PER_OPCODE];
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CLOCK dma_start_clk[INTRRUPT_MAX_DMA_PER_OPCODE];
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/* If 1, do a RESET. */
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int reset;
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/* If 1, call the trapping function. */
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int trap;
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/* Debugging function. */
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void (*trap_func)(WORD, void *data);
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/* Data to pass to the debugging function when called. */
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void *trap_data;
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/* Pointer to the last executed opcode information. */
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unsigned int *last_opcode_info_ptr;
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/* Number of cycles we have stolen to the processor last time. */
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int num_last_stolen_cycles;
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/* Clock tick at which these cycles have been stolen. */
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CLOCK last_stolen_cycles_clk;
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unsigned int global_pending_int;
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void (*nmi_trap_func)(void);
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void (*reset_trap_func)(void);
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/* flag for interrupt_restore to handle CPU snapshots before 1.1 */
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int needs_global_restore;
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};
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typedef struct interrupt_cpu_status_s interrupt_cpu_status_t;
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/* ------------------------------------------------------------------------- */
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extern void interrupt_log_wrong_nirq(void);
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extern void interrupt_log_wrong_nnmi(void);
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extern void interrupt_trigger_dma(interrupt_cpu_status_t *cs, CLOCK cpu_clk);
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extern void interrupt_ack_dma(interrupt_cpu_status_t *cs);
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extern void interrupt_fixup_int_clk(interrupt_cpu_status_t *cs, CLOCK cpu_clk,
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CLOCK *int_clk);
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#if 0 // TC
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/* Set the IRQ line state. */
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inline static void interrupt_set_irq(interrupt_cpu_status_t *cs,
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unsigned int int_num,
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int value, CLOCK cpu_clk)
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{
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if (cs == NULL || int_num >= cs->num_ints)
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return;
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if (value) { /* Trigger the IRQ. */
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if (!(cs->pending_int[int_num] & IK_IRQ)) {
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cs->nirq++;
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cs->global_pending_int = (cs->global_pending_int
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| (unsigned int)(IK_IRQ | IK_IRQPEND));
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cs->pending_int[int_num] = (cs->pending_int[int_num]
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| (unsigned int)IK_IRQ);
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/* This makes sure that IRQ delay is correctly emulated when
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cycles are stolen from the CPU. */
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/*log_debug("ICLK %i", cpu_clk);*/
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if (cs->last_stolen_cycles_clk <= cpu_clk)
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cs->irq_clk = cpu_clk;
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else
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interrupt_fixup_int_clk(cs, cpu_clk, &(cs->irq_clk));
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}
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} else { /* Remove the IRQ condition. */
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if (cs->pending_int[int_num] & IK_IRQ) {
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if (cs->nirq > 0) {
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cs->pending_int[int_num] =
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(cs->pending_int[int_num] & (unsigned int)~IK_IRQ);
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if (--cs->nirq == 0)
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cs->global_pending_int =
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(cs->global_pending_int & (unsigned int)~IK_IRQ);
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} else {
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interrupt_log_wrong_nirq();
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}
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}
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}
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}
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/* Set the NMI line state. */
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inline static void interrupt_set_nmi(interrupt_cpu_status_t *cs,
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unsigned int int_num,
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int value, CLOCK cpu_clk)
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{
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if (cs == NULL || int_num >= cs->num_ints)
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return;
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if (value) { /* Trigger the NMI. */
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if (!(cs->pending_int[int_num] & IK_NMI)) {
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if (cs->nnmi == 0 && !(cs->global_pending_int & IK_NMI)) {
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cs->global_pending_int = (cs->global_pending_int | IK_NMI);
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/* This makes sure that NMI delay is correctly emulated when
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cycles are stolen from the CPU. */
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if (cs->last_stolen_cycles_clk <= cpu_clk)
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cs->nmi_clk = cpu_clk;
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else
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interrupt_fixup_int_clk(cs, cpu_clk, &(cs->nmi_clk));
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}
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cs->nnmi++;
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cs->pending_int[int_num] = (cs->pending_int[int_num] | IK_NMI);
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}
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} else { /* Remove the NMI condition. */
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if (cs->pending_int[int_num] & IK_NMI) {
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if (cs->nnmi > 0) {
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cs->nnmi--;
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cs->pending_int[int_num] =
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(cs->pending_int[int_num] & ~IK_NMI);
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#if 0
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/* It should not be possible to remove the NMI condition,
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only interrupt_ack_nmi() should clear it. */
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if (cpu_clk == cs->nmi_clk)
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cs->global_pending_int = (enum cpu_int)
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(cs->global_pending_int & ~IK_NMI);
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#endif
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} else {
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interrupt_log_wrong_nnmi();
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}
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}
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}
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}
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/* Change the interrupt line state: this can be used to change both NMI
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and IRQ lines. It is slower than `interrupt_set_nmi()' and
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`interrupt_set_irq()', but is left for backward compatibility (it works
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like the old `setirq()'). */
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inline static void interrupt_set_int(interrupt_cpu_status_t *cs, int int_num,
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enum cpu_int value, CLOCK cpu_clk)
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{
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interrupt_set_nmi(cs, int_num, (int)(value & IK_NMI), cpu_clk);
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interrupt_set_irq(cs, int_num, (int)(value & IK_IRQ), cpu_clk);
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}
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/* ------------------------------------------------------------------------- */
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/* This function must be called by the CPU emulator when a pending NMI/IRQ
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request is served. */
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inline static void interrupt_ack_nmi(interrupt_cpu_status_t *cs)
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{
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cs->global_pending_int =
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(cs->global_pending_int & ~IK_NMI);
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if (cs->nmi_trap_func)
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cs->nmi_trap_func();
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}
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inline static void interrupt_ack_irq(interrupt_cpu_status_t *cs)
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{
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cs->global_pending_int =
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(cs->global_pending_int & ~IK_IRQPEND);
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}
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#endif
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/* ------------------------------------------------------------------------- */
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/* Extern functions. These are defined in `interrupt.c'. */
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struct snapshot_module_s;
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extern interrupt_cpu_status_t *interrupt_cpu_status_new(void);
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extern void interrupt_cpu_status_destroy(interrupt_cpu_status_t *cs);
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extern void interrupt_cpu_status_init(interrupt_cpu_status_t *cs,
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unsigned int *last_opcode_info_ptr);
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extern void interrupt_cpu_status_reset(interrupt_cpu_status_t *cs);
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extern void interrupt_trigger_reset(interrupt_cpu_status_t *cs, CLOCK cpu_clk);
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extern unsigned int interrupt_cpu_status_int_new(interrupt_cpu_status_t *cs,
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const char *name);
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extern void interrupt_ack_reset(interrupt_cpu_status_t *cs);
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extern void interrupt_set_reset_trap_func(interrupt_cpu_status_t *cs,
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void (*reset_trap_func)(void));
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extern void interrupt_maincpu_trigger_trap(void (*trap_func)(WORD,
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void *data), void *data);
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extern void interrupt_do_trap(interrupt_cpu_status_t *cs, WORD address);
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extern void interrupt_monitor_trap_on(interrupt_cpu_status_t *cs);
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extern void interrupt_monitor_trap_off(interrupt_cpu_status_t *cs);
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extern void interrupt_cpu_status_time_warp(interrupt_cpu_status_t *cs,
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CLOCK warp_amount,
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int warp_direction);
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extern int interrupt_read_snapshot(interrupt_cpu_status_t *cs,
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struct snapshot_module_s *m);
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extern int interrupt_read_new_snapshot(interrupt_cpu_status_t *cs,
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struct snapshot_module_s *m);
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extern int interrupt_write_snapshot(interrupt_cpu_status_t *cs,
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struct snapshot_module_s *m);
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extern int interrupt_write_new_snapshot(interrupt_cpu_status_t *cs,
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struct snapshot_module_s *m);
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extern void interrupt_restore_irq(interrupt_cpu_status_t *cs, int int_num,
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int value);
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extern void interrupt_restore_nmi(interrupt_cpu_status_t *cs, int int_num,
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int value);
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extern int interrupt_get_irq(interrupt_cpu_status_t *cs, int int_num);
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extern int interrupt_get_nmi(interrupt_cpu_status_t *cs, int int_num);
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extern void interrupt_set_nmi_trap_func(interrupt_cpu_status_t *cs,
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void (*nmi_trap_func)(void));
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/* ------------------------------------------------------------------------- */
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extern interrupt_cpu_status_t *maincpu_int_status;
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extern CLOCK maincpu_clk;
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extern CLOCK drive_clk[2];
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/* For convenience... */
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#define maincpu_set_irq(int_num, value) \
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interrupt_set_irq(maincpu_int_status, (int_num), (value), maincpu_clk)
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#define maincpu_set_irq_clk(int_num, value, clk) \
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interrupt_set_irq(maincpu_int_status, (int_num), (value), (clk))
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#define maincpu_set_nmi(int_num, value) \
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interrupt_set_nmi(maincpu_int_status, (int_num), (value), maincpu_clk)
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#define maincpu_set_nmi_clk(int_num, value, clk) \
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interrupt_set_nmi(maincpu_int_status, (int_num), (value), (clk))
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#define maincpu_set_int(int_num, value) \
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interrupt_set_int(maincpu_int_status, (int_num), (value), maincpu_clk)
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#define maincpu_set_int_clk(int_num, value, clk) \
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interrupt_set_int(maincpu_int_status, (int_num), (value), (clk))
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#define maincpu_trigger_reset() \
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interrupt_trigger_reset(maincpu_int_status, maincpu_clk)
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#endif
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