C++ DO_UPCAST函数代码示例

/* Complete a previous send (backend --> guest) and enable the
   fd_read callback. */
static void netmap_send_completed(NetClientState *nc, ssize_t len)
{
    NetmapState *s = DO_UPCAST(NetmapState, nc, nc);

    netmap_read_poll(s, true);
}

static void smc91c111_cleanup(VLANClientState *nc)
{
    smc91c111_state *s = DO_UPCAST(NICState, nc, nc)->opaque;

    s->nic = NULL;
}

static int spapr_vlan_can_receive(VLANClientState *nc)
{
    VIOsPAPRVLANDevice *dev = DO_UPCAST(NICState, nc, nc)->opaque;

    return (dev->isopen && dev->rx_bufs > 0);
}

/* Return a pointer to the data buffer.  */
static uint8_t *scsi_get_buf(SCSIRequest *req)
{
    SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);

    return r->buf;
}

static uint32_t xen_pt_pci_read_config(PCIDevice *d, uint32_t addr, int len)
{
    XenPCIPassthroughState *s = DO_UPCAST(XenPCIPassthroughState, dev, d);
    uint32_t val = 0;
    XenPTRegGroup *reg_grp_entry = NULL;
    XenPTReg *reg_entry = NULL;
    int rc = 0;
    int emul_len = 0;
    uint32_t find_addr = addr;

    if (xen_pt_pci_config_access_check(d, addr, len)) {
        goto exit;
    }

    /* find register group entry */
    reg_grp_entry = xen_pt_find_reg_grp(s, addr);
    if (reg_grp_entry) {
        /* check 0-Hardwired register group */
        if (reg_grp_entry->reg_grp->grp_type == XEN_PT_GRP_TYPE_HARDWIRED) {
            /* no need to emulate, just return 0 */
            val = 0;
            goto exit;
        }
    }

    /* read I/O device register value */
    rc = xen_host_pci_get_block(&s->real_device, addr, (uint8_t *)&val, len);
    if (rc < 0) {
        XEN_PT_ERR(d, "pci_read_block failed. return value: %d.\n", rc);
        memset(&val, 0xff, len);
    }

    /* just return the I/O device register value for
     * passthrough type register group */
    if (reg_grp_entry == NULL) {
        goto exit;
    }

    /* adjust the read value to appropriate CFC-CFF window */
    val <<= (addr & 3) << 3;
    emul_len = len;

    /* loop around the guest requested size */
    while (emul_len > 0) {
        /* find register entry to be emulated */
        reg_entry = xen_pt_find_reg(reg_grp_entry, find_addr);
        if (reg_entry) {
            XenPTRegInfo *reg = reg_entry->reg;
            uint32_t real_offset = reg_grp_entry->base_offset + reg->offset;
            uint32_t valid_mask = 0xFFFFFFFF >> ((4 - emul_len) << 3);
            uint8_t *ptr_val = NULL;

            valid_mask <<= (find_addr - real_offset) << 3;
            ptr_val = (uint8_t *)&val + (real_offset & 3);

            /* do emulation based on register size */
            switch (reg->size) {
            case 1:
                if (reg->u.b.read) {
                    rc = reg->u.b.read(s, reg_entry, ptr_val, valid_mask);
                }
                break;
            case 2:
                if (reg->u.w.read) {
                    rc = reg->u.w.read(s, reg_entry,
                                       (uint16_t *)ptr_val, valid_mask);
                }
                break;
            case 4:
                if (reg->u.dw.read) {
                    rc = reg->u.dw.read(s, reg_entry,
                                        (uint32_t *)ptr_val, valid_mask);
                }
                break;
            }

            if (rc < 0) {
                xen_shutdown_fatal_error("Internal error: Invalid read "
                                         "emulation. (%s, rc: %d)\n",
                                         __func__, rc);
                return 0;
            }

            /* calculate next address to find */
            emul_len -= reg->size;
            if (emul_len > 0) {
                find_addr = real_offset + reg->size;
            }
        } else {
            /* nothing to do with passthrough type register,
             * continue to find next byte */
            emul_len--;
            find_addr++;
        }
    }

static void sysbus_esp_hard_reset(DeviceState *dev)
{
    SysBusESPState *sysbus = DO_UPCAST(SysBusESPState, busdev.qdev, dev);
    esp_hard_reset(&sysbus->esp);
}

static ssize_t nic_receive(VLANClientState *nc, const uint8_t * buf, size_t size)
{
    dp8393xState *s = DO_UPCAST(NICState, nc, nc)->opaque;
    uint16_t data[10];
    int packet_type;
    uint32_t available, address;
    int width, rx_len = size;
    uint32_t checksum;

    width = (s->regs[SONIC_DCR] & SONIC_DCR_DW) ? 2 : 1;

    s->regs[SONIC_RCR] &= ~(SONIC_RCR_PRX | SONIC_RCR_LBK | SONIC_RCR_FAER |
        SONIC_RCR_CRCR | SONIC_RCR_LPKT | SONIC_RCR_BC | SONIC_RCR_MC);

    packet_type = receive_filter(s, buf, size);
    if (packet_type < 0) {
        DPRINTF("packet not for netcard\n");
        return -1;
    }

    /* XXX: Check byte ordering */

    /* Check for EOL */
    if (s->regs[SONIC_LLFA] & 0x1) {
        /* Are we still in resource exhaustion? */
        size = sizeof(uint16_t) * 1 * width;
        address = ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 5 * width;
        s->memory_rw(s->mem_opaque, address, (uint8_t*)data, size, 0);
        if (data[0 * width] & 0x1) {
            /* Still EOL ; stop reception */
            return -1;
        } else {
            s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
        }
    }

    /* Save current position */
    s->regs[SONIC_TRBA1] = s->regs[SONIC_CRBA1];
    s->regs[SONIC_TRBA0] = s->regs[SONIC_CRBA0];

    /* Calculate the ethernet checksum */
#ifdef SONIC_CALCULATE_RXCRC
    checksum = cpu_to_le32(crc32(0, buf, rx_len));
#else
    checksum = 0;
#endif

    /* Put packet into RBA */
    DPRINTF("Receive packet at %08x\n", (s->regs[SONIC_CRBA1] << 16) | s->regs[SONIC_CRBA0]);
    address = (s->regs[SONIC_CRBA1] << 16) | s->regs[SONIC_CRBA0];
    s->memory_rw(s->mem_opaque, address, (uint8_t*)buf, rx_len, 1);
    address += rx_len;
    s->memory_rw(s->mem_opaque, address, (uint8_t*)&checksum, 4, 1);
    rx_len += 4;
    s->regs[SONIC_CRBA1] = address >> 16;
    s->regs[SONIC_CRBA0] = address & 0xffff;
    available = (s->regs[SONIC_RBWC1] << 16) | s->regs[SONIC_RBWC0];
    available -= rx_len / 2;
    s->regs[SONIC_RBWC1] = available >> 16;
    s->regs[SONIC_RBWC0] = available & 0xffff;

    /* Update status */
    if (((s->regs[SONIC_RBWC1] << 16) | s->regs[SONIC_RBWC0]) < s->regs[SONIC_EOBC]) {
        s->regs[SONIC_RCR] |= SONIC_RCR_LPKT;
    }
    s->regs[SONIC_RCR] |= packet_type;
    s->regs[SONIC_RCR] |= SONIC_RCR_PRX;
    if (s->loopback_packet) {
        s->regs[SONIC_RCR] |= SONIC_RCR_LBK;
        s->loopback_packet = 0;
    }

    /* Write status to memory */
    DPRINTF("Write status at %08x\n", (s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]);
    data[0 * width] = s->regs[SONIC_RCR]; /* status */
    data[1 * width] = rx_len; /* byte count */
    data[2 * width] = s->regs[SONIC_TRBA0]; /* pkt_ptr0 */
    data[3 * width] = s->regs[SONIC_TRBA1]; /* pkt_ptr1 */
    data[4 * width] = s->regs[SONIC_RSC]; /* seq_no */
    size = sizeof(uint16_t) * 5 * width;
    s->memory_rw(s->mem_opaque, (s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA], (uint8_t *)data, size, 1);

    /* Move to next descriptor */
    size = sizeof(uint16_t) * width;
    s->memory_rw(s->mem_opaque,
        ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 5 * width,
        (uint8_t *)data, size, 0);
    s->regs[SONIC_LLFA] = data[0 * width];
    if (s->regs[SONIC_LLFA] & 0x1) {
        /* EOL detected */
        s->regs[SONIC_ISR] |= SONIC_ISR_RDE;
    } else {
        data[0 * width] = 0; /* in_use */
        s->memory_rw(s->mem_opaque,
            ((s->regs[SONIC_URDA] << 16) | s->regs[SONIC_CRDA]) + sizeof(uint16_t) * 6 * width,
            (uint8_t *)data, size, 1);
        s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
        s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX;
        s->regs[SONIC_RSC] = (s->regs[SONIC_RSC] & 0xff00) | (((s->regs[SONIC_RSC] & 0x00ff) + 1) & 0x00ff);

//.........这里部分代码省略.........

void rtc_set_memory(ISADevice *dev, int addr, int val)
{
    RTCState *s = DO_UPCAST(RTCState, dev, dev);
    if (addr >= 0 && addr <= 127)
        s->cmos_data[addr] = val;
}

VHostNetState *tap_get_vhost_net(NetClientState *nc)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);
    assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP);
    return s->vhost_net;
}

static void xlx_spi_reset(DeviceState *d)
{
    xlx_spi_do_reset(DO_UPCAST(XilinxSPI, busdev.qdev, d));
}

int tap_get_fd(NetClientState *nc)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);
    assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP);
    return s->fd;
}

static void tap_poll(NetClientState *nc, bool enable)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);
    tap_read_poll(s, enable);
    tap_write_poll(s, enable);
}

static void tap_send_completed(NetClientState *nc, ssize_t len)
{
    TAPState *s = DO_UPCAST(TAPState, nc, nc);
    tap_read_poll(s, true);
}

VHostNetState *vhost_user_get_vhost_net(NetClientState *nc)
{
    VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
    assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
    return s->vhost_net;
}

void rtc_set_date(ISADevice *dev, const struct tm *tm)
{
    RTCState *s = DO_UPCAST(RTCState, dev, dev);
    s->current_tm = *tm;
    rtc_copy_date(s);
}