hw/intc/loongarch_extioi.c - qemu - Git at Google

 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * Loongson 3A5000 ext interrupt controller emulation
  *
  * Copyright (C) 2021 Loongson Technology Corporation Limited
  */

 #include "qemu/osdep.h"
 #include "qemu/module.h"
 #include "qemu/log.h"
 #include "qapi/error.h"
 #include "hw/irq.h"
 #include "hw/loongarch/virt.h"
 #include "exec/address-spaces.h"
 #include "hw/intc/loongarch_extioi.h"
 #include "trace.h"

 static int extioi_get_index_from_archid(LoongArchExtIOICommonState *s,
                                         uint64_t arch_id)
 {
     int i;

     for (i = 0; i < s->num_cpu; i++) {
         if (s->cpu[i].arch_id == arch_id) {
             break;
         }
     }

     if ((i < s->num_cpu) && s->cpu[i].cpu) {
         return i;
     }

     return -1;
 }

 static void extioi_update_irq(LoongArchExtIOICommonState *s, int irq, int level)
 {
     int ipnum, cpu, found, irq_index, irq_mask;

     ipnum = s->sw_ipmap[irq / 32];
     cpu = s->sw_coremap[irq];
     irq_index = irq / 32;
     irq_mask = 1 << (irq & 0x1f);

     if (level) {
         /* if not enable return false */
         if (((s->enable[irq_index]) & irq_mask) == 0) {
             return;
         }
         s->cpu[cpu].coreisr[irq_index] |= irq_mask;
         found = find_first_bit(s->cpu[cpu].sw_isr[ipnum], EXTIOI_IRQS);
         set_bit(irq, s->cpu[cpu].sw_isr[ipnum]);
         if (found < EXTIOI_IRQS) {
             /* other irq is handling, need not update parent irq level */
             return;
         }
     } else {
         s->cpu[cpu].coreisr[irq_index] &= ~irq_mask;
         clear_bit(irq, s->cpu[cpu].sw_isr[ipnum]);
         found = find_first_bit(s->cpu[cpu].sw_isr[ipnum], EXTIOI_IRQS);
         if (found < EXTIOI_IRQS) {
             /* other irq is handling, need not update parent irq level */
             return;
         }
     }
     qemu_set_irq(s->cpu[cpu].parent_irq[ipnum], level);
 }

 static void extioi_setirq(void *opaque, int irq, int level)
 {
     LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);
     trace_loongarch_extioi_setirq(irq, level);
     if (level) {
         set_bit32(irq, s->isr);
     } else {
         clear_bit32(irq, s->isr);
     }
     extioi_update_irq(s, irq, level);
 }

 static MemTxResult extioi_readw(void *opaque, hwaddr addr, uint64_t *data,
                                 unsigned size, MemTxAttrs attrs)
 {
     LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);
     unsigned long offset = addr & 0xffff;
     uint32_t index, cpu;

     switch (offset) {
     case EXTIOI_NODETYPE_START ... EXTIOI_NODETYPE_END - 1:
         index = (offset - EXTIOI_NODETYPE_START) >> 2;
         *data = s->nodetype[index];
         break;
     case EXTIOI_IPMAP_START ... EXTIOI_IPMAP_END - 1:
         index = (offset - EXTIOI_IPMAP_START) >> 2;
         *data = s->ipmap[index];
         break;
     case EXTIOI_ENABLE_START ... EXTIOI_ENABLE_END - 1:
         index = (offset - EXTIOI_ENABLE_START) >> 2;
         *data = s->enable[index];
         break;
     case EXTIOI_BOUNCE_START ... EXTIOI_BOUNCE_END - 1:
         index = (offset - EXTIOI_BOUNCE_START) >> 2;
         *data = s->bounce[index];
         break;
     case EXTIOI_COREISR_START ... EXTIOI_COREISR_END - 1:
         index = (offset - EXTIOI_COREISR_START) >> 2;
         /* using attrs to get current cpu index */
         cpu = attrs.requester_id;
         *data = s->cpu[cpu].coreisr[index];
         break;
     case EXTIOI_COREMAP_START ... EXTIOI_COREMAP_END - 1:
         index = (offset - EXTIOI_COREMAP_START) >> 2;
         *data = s->coremap[index];
         break;
     default:
         break;
     }

     trace_loongarch_extioi_readw(addr, *data);
     return MEMTX_OK;
 }

 static inline void extioi_enable_irq(LoongArchExtIOICommonState *s, int index,\
                                      uint32_t mask, int level)
 {
     uint32_t val;
     int irq;

     val = mask & s->isr[index];
     irq = ctz32(val);
     while (irq != 32) {
         /*
          * enable bit change from 0 to 1,
          * need to update irq by pending bits
          */
         extioi_update_irq(s, irq + index * 32, level);
         val &= ~(1 << irq);
         irq = ctz32(val);
     }
 }

 static inline void extioi_update_sw_coremap(LoongArchExtIOICommonState *s,
                                             int irq, uint64_t val, bool notify)
 {
     int i, cpu, cpuid;

     /*
      * loongarch only support little endian,
      * so we paresd the value with little endian.
      */
     val = cpu_to_le64(val);

     for (i = 0; i < 4; i++) {
         cpuid = val & 0xff;
         val = val >> 8;

         if (!(s->status & BIT(EXTIOI_ENABLE_CPU_ENCODE))) {
             cpuid = ctz32(cpuid);
             cpuid = (cpuid >= 4) ? 0 : cpuid;
         }

         cpu = extioi_get_index_from_archid(s, cpuid);
         if (cpu < 0) {
             continue;
         }

         if (s->sw_coremap[irq + i] == cpu) {
             continue;
         }

         if (notify && test_bit32(irq + i, s->isr)) {
             /*
              * lower irq at old cpu and raise irq at new cpu
              */
             extioi_update_irq(s, irq + i, 0);
             s->sw_coremap[irq + i] = cpu;
             extioi_update_irq(s, irq + i, 1);
         } else {
             s->sw_coremap[irq + i] = cpu;
         }
     }
 }

 static inline void extioi_update_sw_ipmap(LoongArchExtIOICommonState *s,
                                           int index, uint64_t val)
 {
     int i;
     uint8_t ipnum;

     /*
      * loongarch only support little endian,
      * so we paresd the value with little endian.
      */
     val = cpu_to_le64(val);
     for (i = 0; i < 4; i++) {
         ipnum = val & 0xff;
         ipnum = ctz32(ipnum);
         ipnum = (ipnum >= 4) ? 0 : ipnum;
         s->sw_ipmap[index * 4 + i] = ipnum;
         val = val >> 8;
     }
 }

 static MemTxResult extioi_writew(void *opaque, hwaddr addr,
                           uint64_t val, unsigned size,
                           MemTxAttrs attrs)
 {
     LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);
     int cpu, index, old_data, irq;
     uint32_t offset;

     trace_loongarch_extioi_writew(addr, val);
     offset = addr & 0xffff;

     switch (offset) {
     case EXTIOI_NODETYPE_START ... EXTIOI_NODETYPE_END - 1:
         index = (offset - EXTIOI_NODETYPE_START) >> 2;
         s->nodetype[index] = val;
         break;
     case EXTIOI_IPMAP_START ... EXTIOI_IPMAP_END - 1:
         /*
          * ipmap cannot be set at runtime, can be set only at the beginning
          * of intr driver, need not update upper irq level
          */
         index = (offset - EXTIOI_IPMAP_START) >> 2;
         s->ipmap[index] = val;
         extioi_update_sw_ipmap(s, index, val);
         break;
     case EXTIOI_ENABLE_START ... EXTIOI_ENABLE_END - 1:
         index = (offset - EXTIOI_ENABLE_START) >> 2;
         old_data = s->enable[index];
         s->enable[index] = val;

         /* unmask irq */
         val = s->enable[index] & ~old_data;
         extioi_enable_irq(s, index, val, 1);

         /* mask irq */
         val = ~s->enable[index] & old_data;
         extioi_enable_irq(s, index, val, 0);
         break;
     case EXTIOI_BOUNCE_START ... EXTIOI_BOUNCE_END - 1:
         /* do not emulate hw bounced irq routing */
         index = (offset - EXTIOI_BOUNCE_START) >> 2;
         s->bounce[index] = val;
         break;
     case EXTIOI_COREISR_START ... EXTIOI_COREISR_END - 1:
         index = (offset - EXTIOI_COREISR_START) >> 2;
         /* using attrs to get current cpu index */
         cpu = attrs.requester_id;
         old_data = s->cpu[cpu].coreisr[index];
         s->cpu[cpu].coreisr[index] = old_data & ~val;
         /* write 1 to clear interrupt */
         old_data &= val;
         irq = ctz32(old_data);
         while (irq != 32) {
             extioi_update_irq(s, irq + index * 32, 0);
             old_data &= ~(1 << irq);
             irq = ctz32(old_data);
         }
         break;
     case EXTIOI_COREMAP_START ... EXTIOI_COREMAP_END - 1:
         irq = offset - EXTIOI_COREMAP_START;
         index = irq / 4;
         s->coremap[index] = val;

         extioi_update_sw_coremap(s, irq, val, true);
         break;
     default:
         break;
     }
     return MEMTX_OK;
 }

 static const MemoryRegionOps extioi_ops = {
     .read_with_attrs = extioi_readw,
     .write_with_attrs = extioi_writew,
     .impl.min_access_size = 4,
     .impl.max_access_size = 4,
     .valid.min_access_size = 4,
     .valid.max_access_size = 8,
     .endianness = DEVICE_LITTLE_ENDIAN,
 };

 static MemTxResult extioi_virt_readw(void *opaque, hwaddr addr, uint64_t *data,
                                      unsigned size, MemTxAttrs attrs)
 {
     LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);

     switch (addr) {
     case EXTIOI_VIRT_FEATURES:
         *data = s->features;
         break;
     case EXTIOI_VIRT_CONFIG:
         *data = s->status;
         break;
     default:
         g_assert_not_reached();
     }

     return MEMTX_OK;
 }

 static MemTxResult extioi_virt_writew(void *opaque, hwaddr addr,
                           uint64_t val, unsigned size,
                           MemTxAttrs attrs)
 {
     LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);

     switch (addr) {
     case EXTIOI_VIRT_FEATURES:
         return MEMTX_ACCESS_ERROR;

     case EXTIOI_VIRT_CONFIG:
         /*
          * extioi features can only be set at disabled status
          */
         if ((s->status & BIT(EXTIOI_ENABLE)) && val) {
             return MEMTX_ACCESS_ERROR;
         }

         s->status = val & s->features;
         break;
     default:
         g_assert_not_reached();
     }
     return MEMTX_OK;
 }

 static const MemoryRegionOps extioi_virt_ops = {
     .read_with_attrs = extioi_virt_readw,
     .write_with_attrs = extioi_virt_writew,
     .impl.min_access_size = 4,
     .impl.max_access_size = 4,
     .valid.min_access_size = 4,
     .valid.max_access_size = 8,
     .endianness = DEVICE_LITTLE_ENDIAN,
 };

 static void loongarch_extioi_realize(DeviceState *dev, Error **errp)
 {
     LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(dev);
     LoongArchExtIOIClass *lec = LOONGARCH_EXTIOI_GET_CLASS(dev);
     SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
     Error *local_err = NULL;
     int i;

     lec->parent_realize(dev, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
     }

     for (i = 0; i < EXTIOI_IRQS; i++) {
         sysbus_init_irq(sbd, &s->irq[i]);
     }

     qdev_init_gpio_in(dev, extioi_setirq, EXTIOI_IRQS);
     memory_region_init_io(&s->extioi_system_mem, OBJECT(s), &extioi_ops,
                           s, "extioi_system_mem", 0x900);
     sysbus_init_mmio(sbd, &s->extioi_system_mem);

     if (s->features & BIT(EXTIOI_HAS_VIRT_EXTENSION)) {
         memory_region_init_io(&s->virt_extend, OBJECT(s), &extioi_virt_ops,
                               s, "extioi_virt", EXTIOI_VIRT_SIZE);
         sysbus_init_mmio(sbd, &s->virt_extend);
         s->features |= EXTIOI_VIRT_HAS_FEATURES;
     } else {
         s->status |= BIT(EXTIOI_ENABLE);
     }
 }

 static void loongarch_extioi_unrealize(DeviceState *dev)
 {
     LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(dev);

     g_free(s->cpu);
 }

 static void loongarch_extioi_reset(DeviceState *d)
 {
     LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(d);

     s->status = 0;
 }

 static int vmstate_extioi_post_load(void *opaque, int version_id)
 {
     LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);
     int i, start_irq;

     for (i = 0; i < (EXTIOI_IRQS / 4); i++) {
         start_irq = i * 4;
         extioi_update_sw_coremap(s, start_irq, s->coremap[i], false);
     }

     for (i = 0; i < (EXTIOI_IRQS_IPMAP_SIZE / 4); i++) {
         extioi_update_sw_ipmap(s, i, s->ipmap[i]);
     }

     return 0;
 }

 static void loongarch_extioi_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     LoongArchExtIOIClass *lec = LOONGARCH_EXTIOI_CLASS(klass);
     LoongArchExtIOICommonClass *lecc = LOONGARCH_EXTIOI_COMMON_CLASS(klass);

     device_class_set_parent_realize(dc, loongarch_extioi_realize,
                                     &lec->parent_realize);
     device_class_set_parent_unrealize(dc, loongarch_extioi_unrealize,
                                       &lec->parent_unrealize);
     device_class_set_legacy_reset(dc, loongarch_extioi_reset);
     lecc->post_load = vmstate_extioi_post_load;
 }

 static const TypeInfo loongarch_extioi_types[] = {
     {
         .name          = TYPE_LOONGARCH_EXTIOI,
         .parent        = TYPE_LOONGARCH_EXTIOI_COMMON,
         .instance_size = sizeof(LoongArchExtIOIState),
         .class_size    = sizeof(LoongArchExtIOIClass),
         .class_init    = loongarch_extioi_class_init,
     }
 };

 DEFINE_TYPES(loongarch_extioi_types)
	/* SPDX-License-Identifier: GPL-2.0-or-later */
	/*
	* Loongson 3A5000 ext interrupt controller emulation
	*
	* Copyright (C) 2021 Loongson Technology Corporation Limited
	*/

	#include "qemu/osdep.h"
	#include "qemu/module.h"
	#include "qemu/log.h"
	#include "qapi/error.h"
	#include "hw/irq.h"
	#include "hw/loongarch/virt.h"
	#include "exec/address-spaces.h"
	#include "hw/intc/loongarch_extioi.h"
	#include "trace.h"

	static int extioi_get_index_from_archid(LoongArchExtIOICommonState *s,
	uint64_t arch_id)
	{
	int i;

	for (i = 0; i < s->num_cpu; i++) {
	if (s->cpu[i].arch_id == arch_id) {
	break;
	}
	}

	if ((i < s->num_cpu) && s->cpu[i].cpu) {
	return i;
	}

	return -1;
	}

	static void extioi_update_irq(LoongArchExtIOICommonState *s, int irq, int level)
	{
	int ipnum, cpu, found, irq_index, irq_mask;

	ipnum = s->sw_ipmap[irq / 32];
	cpu = s->sw_coremap[irq];
	irq_index = irq / 32;
	irq_mask = 1 << (irq & 0x1f);

	if (level) {
	/* if not enable return false */
	if (((s->enable[irq_index]) & irq_mask) == 0) {
	return;
	}
	s->cpu[cpu].coreisr[irq_index] \|= irq_mask;
	found = find_first_bit(s->cpu[cpu].sw_isr[ipnum], EXTIOI_IRQS);
	set_bit(irq, s->cpu[cpu].sw_isr[ipnum]);
	if (found < EXTIOI_IRQS) {
	/* other irq is handling, need not update parent irq level */
	return;
	}
	} else {
	s->cpu[cpu].coreisr[irq_index] &= ~irq_mask;
	clear_bit(irq, s->cpu[cpu].sw_isr[ipnum]);
	found = find_first_bit(s->cpu[cpu].sw_isr[ipnum], EXTIOI_IRQS);
	if (found < EXTIOI_IRQS) {
	/* other irq is handling, need not update parent irq level */
	return;
	}
	}
	qemu_set_irq(s->cpu[cpu].parent_irq[ipnum], level);
	}

	static void extioi_setirq(void *opaque, int irq, int level)
	{
	LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);
	trace_loongarch_extioi_setirq(irq, level);
	if (level) {
	set_bit32(irq, s->isr);
	} else {
	clear_bit32(irq, s->isr);
	}
	extioi_update_irq(s, irq, level);
	}

	static MemTxResult extioi_readw(void opaque, hwaddr addr, uint64_t data,
	unsigned size, MemTxAttrs attrs)
	{
	LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);
	unsigned long offset = addr & 0xffff;
	uint32_t index, cpu;

	switch (offset) {
	case EXTIOI_NODETYPE_START ... EXTIOI_NODETYPE_END - 1:
	index = (offset - EXTIOI_NODETYPE_START) >> 2;
	*data = s->nodetype[index];
	break;
	case EXTIOI_IPMAP_START ... EXTIOI_IPMAP_END - 1:
	index = (offset - EXTIOI_IPMAP_START) >> 2;
	*data = s->ipmap[index];
	break;
	case EXTIOI_ENABLE_START ... EXTIOI_ENABLE_END - 1:
	index = (offset - EXTIOI_ENABLE_START) >> 2;
	*data = s->enable[index];
	break;
	case EXTIOI_BOUNCE_START ... EXTIOI_BOUNCE_END - 1:
	index = (offset - EXTIOI_BOUNCE_START) >> 2;
	*data = s->bounce[index];
	break;
	case EXTIOI_COREISR_START ... EXTIOI_COREISR_END - 1:
	index = (offset - EXTIOI_COREISR_START) >> 2;
	/* using attrs to get current cpu index */
	cpu = attrs.requester_id;
	*data = s->cpu[cpu].coreisr[index];
	break;
	case EXTIOI_COREMAP_START ... EXTIOI_COREMAP_END - 1:
	index = (offset - EXTIOI_COREMAP_START) >> 2;
	*data = s->coremap[index];
	break;
	default:
	break;
	}

	trace_loongarch_extioi_readw(addr, *data);
	return MEMTX_OK;
	}

	static inline void extioi_enable_irq(LoongArchExtIOICommonState *s, int index,\
	uint32_t mask, int level)
	{
	uint32_t val;
	int irq;

	val = mask & s->isr[index];
	irq = ctz32(val);
	while (irq != 32) {
	/*
	* enable bit change from 0 to 1,
	* need to update irq by pending bits
	*/
	extioi_update_irq(s, irq + index * 32, level);
	val &= ~(1 << irq);
	irq = ctz32(val);
	}
	}

	static inline void extioi_update_sw_coremap(LoongArchExtIOICommonState *s,
	int irq, uint64_t val, bool notify)
	{
	int i, cpu, cpuid;

	/*
	* loongarch only support little endian,
	* so we paresd the value with little endian.
	*/
	val = cpu_to_le64(val);

	for (i = 0; i < 4; i++) {
	cpuid = val & 0xff;
	val = val >> 8;

	if (!(s->status & BIT(EXTIOI_ENABLE_CPU_ENCODE))) {
	cpuid = ctz32(cpuid);
	cpuid = (cpuid >= 4) ? 0 : cpuid;
	}

	cpu = extioi_get_index_from_archid(s, cpuid);
	if (cpu < 0) {
	continue;
	}

	if (s->sw_coremap[irq + i] == cpu) {
	continue;
	}

	if (notify && test_bit32(irq + i, s->isr)) {
	/*
	* lower irq at old cpu and raise irq at new cpu
	*/
	extioi_update_irq(s, irq + i, 0);
	s->sw_coremap[irq + i] = cpu;
	extioi_update_irq(s, irq + i, 1);
	} else {
	s->sw_coremap[irq + i] = cpu;
	}
	}
	}

	static inline void extioi_update_sw_ipmap(LoongArchExtIOICommonState *s,
	int index, uint64_t val)
	{
	int i;
	uint8_t ipnum;

	/*
	* loongarch only support little endian,
	* so we paresd the value with little endian.
	*/
	val = cpu_to_le64(val);
	for (i = 0; i < 4; i++) {
	ipnum = val & 0xff;
	ipnum = ctz32(ipnum);
	ipnum = (ipnum >= 4) ? 0 : ipnum;
	s->sw_ipmap[index * 4 + i] = ipnum;
	val = val >> 8;
	}
	}

	static MemTxResult extioi_writew(void *opaque, hwaddr addr,
	uint64_t val, unsigned size,
	MemTxAttrs attrs)
	{
	LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);
	int cpu, index, old_data, irq;
	uint32_t offset;

	trace_loongarch_extioi_writew(addr, val);
	offset = addr & 0xffff;

	switch (offset) {
	case EXTIOI_NODETYPE_START ... EXTIOI_NODETYPE_END - 1:
	index = (offset - EXTIOI_NODETYPE_START) >> 2;
	s->nodetype[index] = val;
	break;
	case EXTIOI_IPMAP_START ... EXTIOI_IPMAP_END - 1:
	/*
	* ipmap cannot be set at runtime, can be set only at the beginning
	* of intr driver, need not update upper irq level
	*/
	index = (offset - EXTIOI_IPMAP_START) >> 2;
	s->ipmap[index] = val;
	extioi_update_sw_ipmap(s, index, val);
	break;
	case EXTIOI_ENABLE_START ... EXTIOI_ENABLE_END - 1:
	index = (offset - EXTIOI_ENABLE_START) >> 2;
	old_data = s->enable[index];
	s->enable[index] = val;

	/* unmask irq */
	val = s->enable[index] & ~old_data;
	extioi_enable_irq(s, index, val, 1);

	/* mask irq */
	val = ~s->enable[index] & old_data;
	extioi_enable_irq(s, index, val, 0);
	break;
	case EXTIOI_BOUNCE_START ... EXTIOI_BOUNCE_END - 1:
	/* do not emulate hw bounced irq routing */
	index = (offset - EXTIOI_BOUNCE_START) >> 2;
	s->bounce[index] = val;
	break;
	case EXTIOI_COREISR_START ... EXTIOI_COREISR_END - 1:
	index = (offset - EXTIOI_COREISR_START) >> 2;
	/* using attrs to get current cpu index */
	cpu = attrs.requester_id;
	old_data = s->cpu[cpu].coreisr[index];
	s->cpu[cpu].coreisr[index] = old_data & ~val;
	/* write 1 to clear interrupt */
	old_data &= val;
	irq = ctz32(old_data);
	while (irq != 32) {
	extioi_update_irq(s, irq + index * 32, 0);
	old_data &= ~(1 << irq);
	irq = ctz32(old_data);
	}
	break;
	case EXTIOI_COREMAP_START ... EXTIOI_COREMAP_END - 1:
	irq = offset - EXTIOI_COREMAP_START;
	index = irq / 4;
	s->coremap[index] = val;

	extioi_update_sw_coremap(s, irq, val, true);
	break;
	default:
	break;
	}
	return MEMTX_OK;
	}

	static const MemoryRegionOps extioi_ops = {
	.read_with_attrs = extioi_readw,
	.write_with_attrs = extioi_writew,
	.impl.min_access_size = 4,
	.impl.max_access_size = 4,
	.valid.min_access_size = 4,
	.valid.max_access_size = 8,
	.endianness = DEVICE_LITTLE_ENDIAN,
	};

	static MemTxResult extioi_virt_readw(void opaque, hwaddr addr, uint64_t data,
	unsigned size, MemTxAttrs attrs)
	{
	LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);

	switch (addr) {
	case EXTIOI_VIRT_FEATURES:
	*data = s->features;
	break;
	case EXTIOI_VIRT_CONFIG:
	*data = s->status;
	break;
	default:
	g_assert_not_reached();
	}

	return MEMTX_OK;
	}

	static MemTxResult extioi_virt_writew(void *opaque, hwaddr addr,
	uint64_t val, unsigned size,
	MemTxAttrs attrs)
	{
	LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);

	switch (addr) {
	case EXTIOI_VIRT_FEATURES:
	return MEMTX_ACCESS_ERROR;

	case EXTIOI_VIRT_CONFIG:
	/*
	* extioi features can only be set at disabled status
	*/
	if ((s->status & BIT(EXTIOI_ENABLE)) && val) {
	return MEMTX_ACCESS_ERROR;
	}

	s->status = val & s->features;
	break;
	default:
	g_assert_not_reached();
	}
	return MEMTX_OK;
	}

	static const MemoryRegionOps extioi_virt_ops = {
	.read_with_attrs = extioi_virt_readw,
	.write_with_attrs = extioi_virt_writew,
	.impl.min_access_size = 4,
	.impl.max_access_size = 4,
	.valid.min_access_size = 4,
	.valid.max_access_size = 8,
	.endianness = DEVICE_LITTLE_ENDIAN,
	};

	static void loongarch_extioi_realize(DeviceState dev, Error *errp)
	{
	LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(dev);
	LoongArchExtIOIClass *lec = LOONGARCH_EXTIOI_GET_CLASS(dev);
	SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
	Error *local_err = NULL;
	int i;

	lec->parent_realize(dev, &local_err);
	if (local_err) {
	error_propagate(errp, local_err);
	return;
	}

	for (i = 0; i < EXTIOI_IRQS; i++) {
	sysbus_init_irq(sbd, &s->irq[i]);
	}

	qdev_init_gpio_in(dev, extioi_setirq, EXTIOI_IRQS);
	memory_region_init_io(&s->extioi_system_mem, OBJECT(s), &extioi_ops,
	s, "extioi_system_mem", 0x900);
	sysbus_init_mmio(sbd, &s->extioi_system_mem);

	if (s->features & BIT(EXTIOI_HAS_VIRT_EXTENSION)) {
	memory_region_init_io(&s->virt_extend, OBJECT(s), &extioi_virt_ops,
	s, "extioi_virt", EXTIOI_VIRT_SIZE);
	sysbus_init_mmio(sbd, &s->virt_extend);
	s->features \|= EXTIOI_VIRT_HAS_FEATURES;
	} else {
	s->status \|= BIT(EXTIOI_ENABLE);
	}
	}

	static void loongarch_extioi_unrealize(DeviceState *dev)
	{
	LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(dev);

	g_free(s->cpu);
	}

	static void loongarch_extioi_reset(DeviceState *d)
	{
	LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(d);

	s->status = 0;
	}

	static int vmstate_extioi_post_load(void *opaque, int version_id)
	{
	LoongArchExtIOICommonState *s = LOONGARCH_EXTIOI_COMMON(opaque);
	int i, start_irq;

	for (i = 0; i < (EXTIOI_IRQS / 4); i++) {
	start_irq = i * 4;
	extioi_update_sw_coremap(s, start_irq, s->coremap[i], false);
	}

	for (i = 0; i < (EXTIOI_IRQS_IPMAP_SIZE / 4); i++) {
	extioi_update_sw_ipmap(s, i, s->ipmap[i]);
	}

	return 0;
	}

	static void loongarch_extioi_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	LoongArchExtIOIClass *lec = LOONGARCH_EXTIOI_CLASS(klass);
	LoongArchExtIOICommonClass *lecc = LOONGARCH_EXTIOI_COMMON_CLASS(klass);

	device_class_set_parent_realize(dc, loongarch_extioi_realize,
	&lec->parent_realize);
	device_class_set_parent_unrealize(dc, loongarch_extioi_unrealize,
	&lec->parent_unrealize);
	device_class_set_legacy_reset(dc, loongarch_extioi_reset);
	lecc->post_load = vmstate_extioi_post_load;
	}

	static const TypeInfo loongarch_extioi_types[] = {
	{
	.name = TYPE_LOONGARCH_EXTIOI,
	.parent = TYPE_LOONGARCH_EXTIOI_COMMON,
	.instance_size = sizeof(LoongArchExtIOIState),
	.class_size = sizeof(LoongArchExtIOIClass),
	.class_init = loongarch_extioi_class_init,
	}
	};

	DEFINE_TYPES(loongarch_extioi_types)