Archipelago » qemu

/*

 * Virtio Syborg bindings

 *

 * Copyright (c) 2009 CodeSourcery

 *

 * 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 "syborg.h"

#include "sysbus.h"

#include "virtio.h"

#include "sysemu.h"

//#define DEBUG_SYBORG_VIRTIO

#ifdef DEBUG_SYBORG_VIRTIO

#define DPRINTF(fmt, ...) \

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

#define BADF(fmt, ...) \

do { fprintf(stderr, "syborg_virtio: error: " fmt , ## __VA_ARGS__); \

    exit(1);} while (0)

#else

#define DPRINTF(fmt, ...) do {} while(0)

#define BADF(fmt, ...) \

do { fprintf(stderr, "syborg_virtio: error: " fmt , ## __VA_ARGS__);} while (0)

#endif

enum {

    SYBORG_VIRTIO_ID             = 0,

    SYBORG_VIRTIO_DEVTYPE        = 1,

    SYBORG_VIRTIO_HOST_FEATURES  = 2,

    SYBORG_VIRTIO_GUEST_FEATURES = 3,

    SYBORG_VIRTIO_QUEUE_BASE     = 4,

    SYBORG_VIRTIO_QUEUE_NUM      = 5,

    SYBORG_VIRTIO_QUEUE_SEL      = 6,

    SYBORG_VIRTIO_QUEUE_NOTIFY   = 7,

    SYBORG_VIRTIO_STATUS         = 8,

    SYBORG_VIRTIO_INT_ENABLE     = 9,

    SYBORG_VIRTIO_INT_STATUS     = 10

};

#define SYBORG_VIRTIO_CONFIG 0x100

/* Device independent interface.  */

typedef struct {

    SysBusDevice busdev;

    VirtIODevice *vdev;

    qemu_irq irq;

    uint32_t int_enable;

    uint32_t id;

} SyborgVirtIOProxy;

static uint32_t syborg_virtio_readl(void *opaque, target_phys_addr_t offset)

{

    SyborgVirtIOProxy *s = opaque;

    VirtIODevice *vdev = s->vdev;

    uint32_t ret;

    DPRINTF("readl 0x%x\n", (int)offset);

    if (offset >= SYBORG_VIRTIO_CONFIG) {

        return virtio_config_readl(vdev, offset - SYBORG_VIRTIO_CONFIG);

    }

    switch(offset >> 2) {

    case SYBORG_VIRTIO_ID:

        ret = SYBORG_ID_VIRTIO;

        break;

    case SYBORG_VIRTIO_DEVTYPE:

        ret = s->id;

        break;

    case SYBORG_VIRTIO_HOST_FEATURES:

        ret = vdev->get_features(vdev);

        ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);

        break;

    case SYBORG_VIRTIO_GUEST_FEATURES:

        ret = vdev->features;

        break;

    case SYBORG_VIRTIO_QUEUE_BASE:

        ret = virtio_queue_get_addr(vdev, vdev->queue_sel);

        break;

    case SYBORG_VIRTIO_QUEUE_NUM:

        ret = virtio_queue_get_num(vdev, vdev->queue_sel);

        break;

    case SYBORG_VIRTIO_QUEUE_SEL:

        ret = vdev->queue_sel;

        break;

    case SYBORG_VIRTIO_STATUS:

        ret = vdev->status;

        break;

    case SYBORG_VIRTIO_INT_ENABLE:

        ret = s->int_enable;

        break;

    case SYBORG_VIRTIO_INT_STATUS:

        ret = vdev->isr;

        break;

    default:

        BADF("Bad read offset 0x%x\n", (int)offset);

        return 0;

    }

    return ret;

}

static void syborg_virtio_writel(void *opaque, target_phys_addr_t offset,

                                 uint32_t value)

{

    SyborgVirtIOProxy *s = opaque;

    VirtIODevice *vdev = s->vdev;

    DPRINTF("writel 0x%x = 0x%x\n", (int)offset, value);

    if (offset >= SYBORG_VIRTIO_CONFIG) {

        return virtio_config_writel(vdev, offset - SYBORG_VIRTIO_CONFIG,

                                    value);

    }

    switch (offset >> 2) {

    case SYBORG_VIRTIO_GUEST_FEATURES:

        if (vdev->set_features)

            vdev->set_features(vdev, value);

        vdev->features = value;

        break;

    case SYBORG_VIRTIO_QUEUE_BASE:

        if (value == 0)

            virtio_reset(vdev);

        else

            virtio_queue_set_addr(vdev, vdev->queue_sel, value);

        break;

    case SYBORG_VIRTIO_QUEUE_SEL:

        if (value < VIRTIO_PCI_QUEUE_MAX)

            vdev->queue_sel = value;

        break;

    case SYBORG_VIRTIO_QUEUE_NOTIFY:

        virtio_queue_notify(vdev, value);

        break;

    case SYBORG_VIRTIO_STATUS:

        vdev->status = value & 0xFF;

        if (vdev->status == 0)

            virtio_reset(vdev);

        break;

    case SYBORG_VIRTIO_INT_ENABLE:

        s->int_enable = value;

        virtio_update_irq(vdev);

        break;

    case SYBORG_VIRTIO_INT_STATUS:

        vdev->isr &= ~value;

        virtio_update_irq(vdev);

        break;

    default:

        BADF("Bad write offset 0x%x\n", (int)offset);

        break;

    }

}

static uint32_t syborg_virtio_readw(void *opaque, target_phys_addr_t offset)

{

    SyborgVirtIOProxy *s = opaque;

    VirtIODevice *vdev = s->vdev;

    DPRINTF("readw 0x%x\n", (int)offset);

    if (offset >= SYBORG_VIRTIO_CONFIG) {

        return virtio_config_readw(vdev, offset - SYBORG_VIRTIO_CONFIG);

    }

    BADF("Bad halfword read offset 0x%x\n", (int)offset);

    return -1;

}

static void syborg_virtio_writew(void *opaque, target_phys_addr_t offset,

                                 uint32_t value)

{

    SyborgVirtIOProxy *s = opaque;

    VirtIODevice *vdev = s->vdev;

    DPRINTF("writew 0x%x = 0x%x\n", (int)offset, value);

    if (offset >= SYBORG_VIRTIO_CONFIG) {

        return virtio_config_writew(vdev, offset - SYBORG_VIRTIO_CONFIG,

                                    value);

    }

    BADF("Bad halfword write offset 0x%x\n", (int)offset);

}

static uint32_t syborg_virtio_readb(void *opaque, target_phys_addr_t offset)

{

    SyborgVirtIOProxy *s = opaque;

    VirtIODevice *vdev = s->vdev;

    DPRINTF("readb 0x%x\n", (int)offset);

    if (offset >= SYBORG_VIRTIO_CONFIG) {

        return virtio_config_readb(vdev, offset - SYBORG_VIRTIO_CONFIG);

    }

    BADF("Bad byte read offset 0x%x\n", (int)offset);

    return -1;

}

static void syborg_virtio_writeb(void *opaque, target_phys_addr_t offset,

                                 uint32_t value)

{

    SyborgVirtIOProxy *s = opaque;

    VirtIODevice *vdev = s->vdev;

    DPRINTF("writeb 0x%x = 0x%x\n", (int)offset, value);

    if (offset >= SYBORG_VIRTIO_CONFIG) {

        return virtio_config_writeb(vdev, offset - SYBORG_VIRTIO_CONFIG,

                                    value);

    }

    BADF("Bad byte write offset 0x%x\n", (int)offset);

}

static CPUReadMemoryFunc * const syborg_virtio_readfn[] = {

     syborg_virtio_readb,

     syborg_virtio_readw,

     syborg_virtio_readl

};

static CPUWriteMemoryFunc * const syborg_virtio_writefn[] = {

     syborg_virtio_writeb,

     syborg_virtio_writew,

     syborg_virtio_writel

};

static void syborg_virtio_update_irq(void *opaque, uint16_t vector)

{

    SyborgVirtIOProxy *proxy = opaque;

    int level;

    level = proxy->int_enable & proxy->vdev->isr;

    DPRINTF("IRQ %d\n", level);

    qemu_set_irq(proxy->irq, level != 0);

}

static VirtIOBindings syborg_virtio_bindings = {

    .notify = syborg_virtio_update_irq

};

static int syborg_virtio_init(SyborgVirtIOProxy *proxy, VirtIODevice *vdev)

{

    int iomemtype;

    proxy->vdev = vdev;

    /* Don't support multiple vectors */

    proxy->vdev->nvectors = 0;

    sysbus_init_irq(&proxy->busdev, &proxy->irq);

    iomemtype = cpu_register_io_memory(syborg_virtio_readfn,

                                       syborg_virtio_writefn, proxy);

    sysbus_init_mmio(&proxy->busdev, 0x1000, iomemtype);

    proxy->id = ((uint32_t)0x1af4 << 16) | vdev->device_id;

    qemu_register_reset(virtio_reset, vdev);

    virtio_bind_device(vdev, &syborg_virtio_bindings, proxy);

    return 0;

}

/* Device specific bindings.  */

static int syborg_virtio_net_init(SysBusDevice *dev)

{

    VirtIODevice *vdev;

    SyborgVirtIOProxy *proxy = FROM_SYSBUS(SyborgVirtIOProxy, dev);

    vdev = virtio_net_init(&dev->qdev);

    return syborg_virtio_init(proxy, vdev);

}

static void syborg_virtio_register_devices(void)

{

    sysbus_register_dev("syborg,virtio-net", sizeof(SyborgVirtIOProxy),

                        syborg_virtio_net_init);

}

device_init(syborg_virtio_register_devices)