Archipelago » qemu

/*

 *  System (CPU) Bus device support code

 *

 *  Copyright (c) 2009 CodeSourcery

 *

 * 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/sysbus.h"

#include "monitor/monitor.h"

#include "exec/address-spaces.h"

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

static char *sysbus_get_fw_dev_path(DeviceState *dev);

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

{

    BusClass *k = BUS_CLASS(klass);

    k->print_dev = sysbus_dev_print;

    k->get_fw_dev_path = sysbus_get_fw_dev_path;

}

static const TypeInfo system_bus_info = {

    .name = TYPE_SYSTEM_BUS,

    .parent = TYPE_BUS,

    .instance_size = sizeof(BusState),

    .class_init = system_bus_class_init,

};

void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)

{

    assert(n >= 0 && n < dev->num_irq);

    dev->irqs[n] = NULL;

    if (dev->irqp[n]) {

        *dev->irqp[n] = irq;

    }

}

static void sysbus_mmio_map_common(SysBusDevice *dev, int n, hwaddr addr,

                                   bool may_overlap, int priority)

{

    assert(n >= 0 && n < dev->num_mmio);

    if (dev->mmio[n].addr == addr) {

        /* ??? region already mapped here.  */

        return;

    }

    if (dev->mmio[n].addr != (hwaddr)-1) {

        /* Unregister previous mapping.  */

        memory_region_del_subregion(get_system_memory(), dev->mmio[n].memory);

    }

    dev->mmio[n].addr = addr;

    if (may_overlap) {

        memory_region_add_subregion_overlap(get_system_memory(),

                                            addr,

                                            dev->mmio[n].memory,

                                            priority);

    }

    else {

        memory_region_add_subregion(get_system_memory(),

                                    addr,

                                    dev->mmio[n].memory);

    }

}

void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)

{

    sysbus_mmio_map_common(dev, n, addr, false, 0);

}

void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,

                             int priority)

{

    sysbus_mmio_map_common(dev, n, addr, true, priority);

}

/* Request an IRQ source.  The actual IRQ object may be populated later.  */

void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)

{

    int n;

    assert(dev->num_irq < QDEV_MAX_IRQ);

    n = dev->num_irq++;

    dev->irqp[n] = p;

}

/* Pass IRQs from a target device.  */

void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target)

{

    int i;

    assert(dev->num_irq == 0);

    dev->num_irq = target->num_irq;

    for (i = 0; i < dev->num_irq; i++) {

        dev->irqp[i] = target->irqp[i];

    }

}

void sysbus_init_mmio(SysBusDevice *dev, MemoryRegion *memory)

{

    int n;

    assert(dev->num_mmio < QDEV_MAX_MMIO);

    n = dev->num_mmio++;

    dev->mmio[n].addr = -1;

    dev->mmio[n].memory = memory;

}

MemoryRegion *sysbus_mmio_get_region(SysBusDevice *dev, int n)

{

    return dev->mmio[n].memory;

}

void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size)

{

    pio_addr_t i;

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

        assert(dev->num_pio < QDEV_MAX_PIO);

        dev->pio[dev->num_pio++] = ioport++;

    }

}

static int sysbus_device_init(DeviceState *dev)

{

    SysBusDevice *sd = SYS_BUS_DEVICE(dev);

    SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(sd);

    if (!sbc->init) {

        return 0;

    }

    return sbc->init(sd);

}

DeviceState *sysbus_create_varargs(const char *name,

                                   hwaddr addr, ...)

{

    DeviceState *dev;

    SysBusDevice *s;

    va_list va;

    qemu_irq irq;

    int n;

    dev = qdev_create(NULL, name);

    s = SYS_BUS_DEVICE(dev);

    qdev_init_nofail(dev);

    if (addr != (hwaddr)-1) {

        sysbus_mmio_map(s, 0, addr);

    }

    va_start(va, addr);

    n = 0;

    while (1) {

        irq = va_arg(va, qemu_irq);

        if (!irq) {

            break;

        }

        sysbus_connect_irq(s, n, irq);

        n++;

    }

    va_end(va);

    return dev;

}

DeviceState *sysbus_try_create_varargs(const char *name,

                                       hwaddr addr, ...)

{

    DeviceState *dev;

    SysBusDevice *s;

    va_list va;

    qemu_irq irq;

    int n;

    dev = qdev_try_create(NULL, name);

    if (!dev) {

        return NULL;

    }

    s = SYS_BUS_DEVICE(dev);

    qdev_init_nofail(dev);

    if (addr != (hwaddr)-1) {

        sysbus_mmio_map(s, 0, addr);

    }

    va_start(va, addr);

    n = 0;

    while (1) {

        irq = va_arg(va, qemu_irq);

        if (!irq) {

            break;

        }

        sysbus_connect_irq(s, n, irq);

        n++;

    }

    va_end(va);

    return dev;

}

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

{

    SysBusDevice *s = SYS_BUS_DEVICE(dev);

    hwaddr size;

    int i;

    monitor_printf(mon, "%*sirq %d\n", indent, "", s->num_irq);

    for (i = 0; i < s->num_mmio; i++) {

        size = memory_region_size(s->mmio[i].memory);

        monitor_printf(mon, "%*smmio " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",

                       indent, "", s->mmio[i].addr, size);

    }

}

static char *sysbus_get_fw_dev_path(DeviceState *dev)

{

    SysBusDevice *s = SYS_BUS_DEVICE(dev);

    char path[40];

    int off;

    off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));

    if (s->num_mmio) {

        snprintf(path + off, sizeof(path) - off, "@"TARGET_FMT_plx,

                 s->mmio[0].addr);

    } else if (s->num_pio) {

        snprintf(path + off, sizeof(path) - off, "@i%04x", s->pio[0]);

    }

    return g_strdup(path);

}

void sysbus_add_io(SysBusDevice *dev, hwaddr addr,

                       MemoryRegion *mem)

{

    memory_region_add_subregion(get_system_io(), addr, mem);

}

void sysbus_del_io(SysBusDevice *dev, MemoryRegion *mem)

{

    memory_region_del_subregion(get_system_io(), mem);

}

MemoryRegion *sysbus_address_space(SysBusDevice *dev)

{

    return get_system_memory();

}

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

{

    DeviceClass *k = DEVICE_CLASS(klass);

    k->init = sysbus_device_init;

    k->bus_type = TYPE_SYSTEM_BUS;

    /*

     * device_add plugs devices into suitable bus.  For "real" buses,

     * that actually connects the device.  For sysbus, the connections

     * need to be made separately, and device_add can't do that.  The

     * device would be left unconnected, and could not possibly work.

     */

    k->cannot_instantiate_with_device_add_yet = true;

}

static const TypeInfo sysbus_device_type_info = {

    .name = TYPE_SYS_BUS_DEVICE,

    .parent = TYPE_DEVICE,

    .instance_size = sizeof(SysBusDevice),

    .abstract = true,

    .class_size = sizeof(SysBusDeviceClass),

    .class_init = sysbus_device_class_init,

};

/* This is a nasty hack to allow passing a NULL bus to qdev_create.  */

static BusState *main_system_bus;

static void main_system_bus_create(void)

{

    /* assign main_system_bus before qbus_create_inplace()

     * in order to make "if (bus != sysbus_get_default())" work */

    main_system_bus = g_malloc0(system_bus_info.instance_size);

    qbus_create_inplace(main_system_bus, system_bus_info.instance_size,

                        TYPE_SYSTEM_BUS, NULL, "main-system-bus");

    OBJECT(main_system_bus)->free = g_free;

    object_property_add_child(container_get(qdev_get_machine(),

                                            "/unattached"),

                              "sysbus", OBJECT(main_system_bus), NULL);

}

BusState *sysbus_get_default(void)

{

    if (!main_system_bus) {

        main_system_bus_create();

    }

    return main_system_bus;

}

static void sysbus_register_types(void)

{

    type_register_static(&system_bus_info);

    type_register_static(&sysbus_device_type_info);

}

type_init(sysbus_register_types)