Add interrupt controller interface and definitions.

devices/common/hwcomponent.h

@@ -37,6 +37,7 @@ enum HWCompType : int {
     I2C_DEV     =  61, /* I2C device */
     ADB_HOST    =  70, /* ADB host   */
     ADB_DEV     =  71, /* ADB device */
+    INT_CTRL    =  80, /* interrupt controller */
     SND_SERVER  = 100, /* host sound server */
 };
 

devices/common/hwinterrupt.h

@@ -0,0 +1,51 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-22 divingkatae and maximum
+                      (theweirdo)     spatium
+
+(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#ifndef HW_INTERRUPT_H
+#define HW_INTERRUPT_H
+
+#include <cinttypes>
+
+/** Enumerator for various interrupt sources. */
+enum IntSrc : int {
+    VIA_CUDA = 1,
+    VIA2     = 2,
+    SCC      = 3,
+    ETHERNET = 4,
+    NMI      = 5,
+};
+
+/** Base class for interrupt controllers. */
+class InterruptCtrl {
+public:
+    InterruptCtrl() = default;
+    virtual ~InterruptCtrl() = default;
+
+    // register interrupt sources for a device
+    virtual uint32_t register_dev_int(IntSrc src_id) = 0;
+    virtual uint32_t register_dma_int(IntSrc src_id) = 0;
+
+    // acknowledge HW interrupt
+    virtual void ack_int(uint32_t irq_id, uint8_t irq_line_state)     = 0;
+    virtual void ack_dma_int(uint32_t irq_id, uint8_t irq_line_state) = 0;
+};
+
+#endif // HW_INTERRUPT_H