virtio-blk: Avoid zeroing every request structure

[qemu.git] / hw / dec_pci.c

/*
 * QEMU DEC 21154 PCI bridge
 *
 * Copyright (c) 2006-2007 Fabrice Bellard
 * Copyright (c) 2007 Jocelyn Mayer
 *
 * 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 "dec_pci.h"
#include "sysbus.h"
#include "pci.h"
#include "pci_host.h"

/* debug DEC */
//#define DEBUG_DEC

#ifdef DEBUG_DEC
#define DEC_DPRINTF(fmt, ...)                               \
    do { printf("DEC: " fmt , ## __VA_ARGS__); } while (0)
#else
#define DEC_DPRINTF(fmt, ...)
#endif

typedef struct DECState {
    SysBusDevice busdev;
    PCIHostState host_state;
} DECState;

static int dec_map_irq(PCIDevice *pci_dev, int irq_num)
{
    return irq_num;
}

PCIBus *pci_dec_21154_init(PCIBus *parent_bus, int devfn)
{
    DeviceState *dev;
    PCIBus *ret;

    dev = qdev_create(NULL, "dec-21154");
    qdev_init_nofail(dev);
    ret = pci_bridge_init(parent_bus, devfn,
                          PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21154,
                          dec_map_irq, "DEC 21154 PCI-PCI bridge");

    return ret;
}

static int pci_dec_21154_init_device(SysBusDevice *dev)
{
    DECState *s;
    int pci_mem_config, pci_mem_data;

    s = FROM_SYSBUS(DECState, dev);

    pci_mem_config = pci_host_conf_register_mmio(&s->host_state, 1);
    pci_mem_data = pci_host_data_register_mmio(&s->host_state, 1);
    sysbus_init_mmio(dev, 0x1000, pci_mem_config);
    sysbus_init_mmio(dev, 0x1000, pci_mem_data);
    return 0;
}

static int dec_21154_pci_host_init(PCIDevice *d)
{
    /* PCI2PCI bridge same values as PearPC - check this */
    pci_config_set_vendor_id(d->config, PCI_VENDOR_ID_DEC);
    pci_config_set_device_id(d->config, PCI_DEVICE_ID_DEC_21154);
    pci_set_byte(d->config + PCI_REVISION_ID, 0x02);
    pci_config_set_class(d->config, PCI_CLASS_BRIDGE_PCI);
    return 0;
}

static PCIDeviceInfo dec_21154_pci_host_info = {
    .qdev.name = "dec-21154",
    .qdev.size = sizeof(PCIDevice),
    .init      = dec_21154_pci_host_init,
    .header_type  = PCI_HEADER_TYPE_BRIDGE,
};

static void dec_register_devices(void)
{
    sysbus_register_dev("dec-21154", sizeof(DECState),
                        pci_dec_21154_init_device);
    pci_qdev_register(&dec_21154_pci_host_info);
}

device_init(dec_register_devices)