Archipelago » qemu

/*

 * isa bus support for qdev.

 *

 * Copyright (c) 2009 Gerd Hoffmann <kraxel@redhat.com>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#include "hw.h"

#include "sysemu.h"

#include "monitor.h"

#include "sysbus.h"

#include "isa.h"

struct ISABus {

    BusState qbus;

    qemu_irq *irqs;

    uint32_t assigned;

};

static ISABus *isabus;

static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);

static struct BusInfo isa_bus_info = {

    .name      = "ISA",

    .size      = sizeof(ISABus),

    .print_dev = isabus_dev_print,

};

ISABus *isa_bus_new(DeviceState *dev)

{

    if (isabus) {

        fprintf(stderr, "Can't create a second ISA bus\n");

        return NULL;

    }

    if (NULL == dev) {

        dev = qdev_create(NULL, "isabus-bridge");

        qdev_init(dev);

    }

    isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));

    return isabus;

}

void isa_bus_irqs(qemu_irq *irqs)

{

    isabus->irqs = irqs;

}

void isa_connect_irq(ISADevice *dev, int devnr, int isairq)

{

    assert(devnr >= 0 && devnr < dev->nirqs);

    if (isabus->assigned & (1 << isairq)) {

        fprintf(stderr, "isa irq %d already assigned\n", isairq);

        exit(1);

    }

    if (dev->irqs[devnr]) {

        isabus->assigned |= (1 << isairq);

        dev->isairq[devnr] = isairq;

        *dev->irqs[devnr] = isabus->irqs[isairq];

    }

}

/*

 * isa_reserve_irq() reserves the ISA irq and returns the corresponding

 * qemu_irq entry for the i8259.

 *

 * This function is only for special cases such as the 'ferr', and

 * temporary use for normal devices until they are converted to qdev.

 */

qemu_irq isa_reserve_irq(int isairq)

{

    if (isairq < 0 || isairq > 15) {

        fprintf(stderr, "isa irq %d invalid\n", isairq);

        exit(1);

    }

    if (isabus->assigned & (1 << isairq)) {

        fprintf(stderr, "isa irq %d already assigned\n", isairq);

        exit(1);

    }

    isabus->assigned |= (1 << isairq);

    return isabus->irqs[isairq];

}

void isa_init_irq(ISADevice *dev, qemu_irq *p)

{

    assert(dev->nirqs < ARRAY_SIZE(dev->irqs));

    dev->irqs[dev->nirqs] = p;

    dev->nirqs++;

}

static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)

{

    ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);

    ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);

    dev->isairq[0] = -1;

    dev->isairq[1] = -1;

    return info->init(dev);

}

void isa_qdev_register(ISADeviceInfo *info)

{

    info->qdev.init = isa_qdev_init;

    info->qdev.bus_info = &isa_bus_info;

    qdev_register(&info->qdev);

}

ISADevice *isa_create_simple(const char *name, uint32_t irq, uint32 irq2)

{

    DeviceState *dev;

    ISADevice *isa;

    if (!isabus) {

        fprintf(stderr, "Tried to create isa device %s with no isa bus present.\n", name);

        return NULL;

    }

    dev = qdev_create(&isabus->qbus, name);

    isa = DO_UPCAST(ISADevice, qdev, dev);

    qdev_init(dev);

    if (irq != -1) {

        isa_connect_irq(isa, 0, irq);

    }

    if (irq2 != -1) {

        isa_connect_irq(isa, 1, irq2);

    }

    return isa;

}

static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)

{

    ISADevice *d = DO_UPCAST(ISADevice, qdev, dev);

    if (d->isairq[1] != -1) {

        monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",

                       d->isairq[0], d->isairq[1]);

    } else if (d->isairq[0] != -1) {

        monitor_printf(mon, "%*sisa irq %d\n", indent, "",

                       d->isairq[0]);

    }

}

static int isabus_bridge_init(SysBusDevice *dev)

{

    /* nothing */

    return 0;

}

static SysBusDeviceInfo isabus_bridge_info = {

    .init = isabus_bridge_init,

    .qdev.name  = "isabus-bridge",

    .qdev.size  = sizeof(SysBusDevice),

};

static void isabus_register_devices(void)

{

    sysbus_register_withprop(&isabus_bridge_info);

}

device_init(isabus_register_devices)