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* QEMU Sparc Sun4c interrupt controller emulation
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* Based on slavio_intctl, copyright (c) 2003-2005 Fabrice Bellard
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* 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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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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#include "hw/sparc/sun4m.h"
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#include "monitor/monitor.h"
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#include "hw/sysbus.h"
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//#define DEBUG_IRQ_COUNT
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#define DPRINTF(fmt, ...) \
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do { printf("IRQ: " fmt , ## __VA_ARGS__); } while (0)
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#define DPRINTF(fmt, ...)
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* Registers of interrupt controller in sun4c.
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typedef struct Sun4c_INTCTLState {
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#ifdef DEBUG_IRQ_COUNT
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qemu_irq cpu_irqs[MAX_PILS];
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const uint32_t *intbit_to_level;
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static void sun4c_check_interrupts(void *opaque);
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static uint64_t sun4c_intctl_mem_read(void *opaque, hwaddr addr,
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Sun4c_INTCTLState *s = opaque;
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DPRINTF("read reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);
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static void sun4c_intctl_mem_write(void *opaque, hwaddr addr,
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uint64_t val, unsigned size)
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Sun4c_INTCTLState *s = opaque;
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DPRINTF("write reg 0x" TARGET_FMT_plx " = %x\n", addr, (unsigned)val);
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sun4c_check_interrupts(s);
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static const MemoryRegionOps sun4c_intctl_mem_ops = {
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.read = sun4c_intctl_mem_read,
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.write = sun4c_intctl_mem_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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static const uint32_t intbit_to_level[] = { 0, 1, 4, 6, 8, 10, 0, 14, };
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static void sun4c_check_interrupts(void *opaque)
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Sun4c_INTCTLState *s = opaque;
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uint32_t pil_pending;
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if (s->pending && !(s->reg & 0x80000000)) {
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for (i = 0; i < 8; i++) {
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if (s->pending & (1 << i))
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pil_pending |= 1 << intbit_to_level[i];
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for (i = 0; i < MAX_PILS; i++) {
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if (pil_pending & (1 << i)) {
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if (!(s->pil_out & (1 << i)))
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qemu_irq_raise(s->cpu_irqs[i]);
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if (s->pil_out & (1 << i))
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qemu_irq_lower(s->cpu_irqs[i]);
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s->pil_out = pil_pending;
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* "irq" here is the bit number in the system interrupt register
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static void sun4c_set_irq(void *opaque, int irq, int level)
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Sun4c_INTCTLState *s = opaque;
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uint32_t mask = 1 << irq;
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uint32_t pil = intbit_to_level[irq];
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DPRINTF("Set irq %d -> pil %d level %d\n", irq, pil,
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#ifdef DEBUG_IRQ_COUNT
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sun4c_check_interrupts(s);
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static const VMStateDescription vmstate_sun4c_intctl = {
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.name ="sun4c_intctl",
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.fields = (VMStateField []) {
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VMSTATE_UINT8(reg, Sun4c_INTCTLState),
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VMSTATE_UINT8(pending, Sun4c_INTCTLState),
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VMSTATE_END_OF_LIST()
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static void sun4c_intctl_reset(DeviceState *d)
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Sun4c_INTCTLState *s = container_of(d, Sun4c_INTCTLState, busdev.qdev);
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static int sun4c_intctl_init1(SysBusDevice *dev)
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Sun4c_INTCTLState *s = FROM_SYSBUS(Sun4c_INTCTLState, dev);
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memory_region_init_io(&s->iomem, &sun4c_intctl_mem_ops, s,
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"intctl", INTCTL_SIZE);
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sysbus_init_mmio(dev, &s->iomem);
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qdev_init_gpio_in(&dev->qdev, sun4c_set_irq, 8);
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for (i = 0; i < MAX_PILS; i++) {
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sysbus_init_irq(dev, &s->cpu_irqs[i]);
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static void sun4c_intctl_class_init(ObjectClass *klass, void *data)
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DeviceClass *dc = DEVICE_CLASS(klass);
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SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
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k->init = sun4c_intctl_init1;
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dc->reset = sun4c_intctl_reset;
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dc->vmsd = &vmstate_sun4c_intctl;
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static const TypeInfo sun4c_intctl_info = {
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.name = "sun4c_intctl",
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(Sun4c_INTCTLState),
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.class_init = sun4c_intctl_class_init,
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static void sun4c_intctl_register_types(void)
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type_register_static(&sun4c_intctl_info);
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type_init(sun4c_intctl_register_types)