Archipelago » qemu

/*

 * QEMU Sparc SBI interrupt controller emulation

 *

 * Based on slavio_intctl, copyright (c) 2003-2005 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "hw/sysbus.h"

//#define DEBUG_IRQ

#ifdef DEBUG_IRQ

#define DPRINTF(fmt, ...)                                       \

    do { printf("IRQ: " fmt , ## __VA_ARGS__); } while (0)

#else

#define DPRINTF(fmt, ...)

#endif

#define MAX_CPUS 16

#define SBI_NREGS 16

typedef struct SBIState {

    SysBusDevice busdev;

    MemoryRegion iomem;

    uint32_t regs[SBI_NREGS];

    uint32_t intreg_pending[MAX_CPUS];

    qemu_irq cpu_irqs[MAX_CPUS];

    uint32_t pil_out[MAX_CPUS];

} SBIState;

#define SBI_SIZE (SBI_NREGS * 4)

static void sbi_set_irq(void *opaque, int irq, int level)

{

}

static uint64_t sbi_mem_read(void *opaque, hwaddr addr,

                             unsigned size)

{

    SBIState *s = opaque;

    uint32_t saddr, ret;

    saddr = addr >> 2;

    switch (saddr) {

    default:

        ret = s->regs[saddr];

        break;

    }

    DPRINTF("read system reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);

    return ret;

}

static void sbi_mem_write(void *opaque, hwaddr addr,

                          uint64_t val, unsigned dize)

{

    SBIState *s = opaque;

    uint32_t saddr;

    saddr = addr >> 2;

    DPRINTF("write system reg 0x" TARGET_FMT_plx " = %x\n", addr, (int)val);

    switch (saddr) {

    default:

        s->regs[saddr] = val;

        break;

    }

}

static const MemoryRegionOps sbi_mem_ops = {

    .read = sbi_mem_read,

    .write = sbi_mem_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

    .valid = {

        .min_access_size = 4,

        .max_access_size = 4,

    },

};

static const VMStateDescription vmstate_sbi = {

    .name ="sbi",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields      = (VMStateField []) {

        VMSTATE_UINT32_ARRAY(intreg_pending, SBIState, MAX_CPUS),

        VMSTATE_END_OF_LIST()

    }

};

static void sbi_reset(DeviceState *d)

{

    SBIState *s = container_of(d, SBIState, busdev.qdev);

    unsigned int i;

    for (i = 0; i < MAX_CPUS; i++) {

        s->intreg_pending[i] = 0;

    }

}

static int sbi_init1(SysBusDevice *dev)

{

    SBIState *s = FROM_SYSBUS(SBIState, dev);

    unsigned int i;

    qdev_init_gpio_in(&dev->qdev, sbi_set_irq, 32 + MAX_CPUS);

    for (i = 0; i < MAX_CPUS; i++) {

        sysbus_init_irq(dev, &s->cpu_irqs[i]);

    }

    memory_region_init_io(&s->iomem, &sbi_mem_ops, s, "sbi", SBI_SIZE);

    sysbus_init_mmio(dev, &s->iomem);

    return 0;

}

static void sbi_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = sbi_init1;

    dc->reset = sbi_reset;

    dc->vmsd = &vmstate_sbi;

}

static const TypeInfo sbi_info = {

    .name          = "sbi",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(SBIState),

    .class_init    = sbi_class_init,

};

static void sbi_register_types(void)

{

    type_register_static(&sbi_info);

}

type_init(sbi_register_types)