Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 164 insertions, 0 deletions

diff --git a/hw/pci-bridge/dec.c b/hw/pci-bridge/dec.c
new file mode 100644
index 000000000..4773d07e6
--- /dev/null
+++ b/hw/pci-bridge/dec.c
@@ -0,0 +1,164 @@
+/*
+ * 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 "qemu/osdep.h"
+#include "dec.h"
+#include "hw/sysbus.h"
+#include "qapi/error.h"
+#include "qemu/module.h"
+#include "hw/pci/pci.h"
+#include "hw/pci/pci_host.h"
+#include "hw/pci/pci_bridge.h"
+#include "hw/pci/pci_bus.h"
+#include "qom/object.h"
+
+OBJECT_DECLARE_SIMPLE_TYPE(DECState, DEC_21154)
+
+struct DECState {
+    PCIHostState parent_obj;
+};
+
+static int dec_map_irq(PCIDevice *pci_dev, int irq_num)
+{
+    return irq_num;
+}
+
+static void dec_pci_bridge_realize(PCIDevice *pci_dev, Error **errp)
+{
+    pci_bridge_initfn(pci_dev, TYPE_PCI_BUS);
+}
+
+static void dec_21154_pci_bridge_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+    k->realize = dec_pci_bridge_realize;
+    k->exit = pci_bridge_exitfn;
+    k->vendor_id = PCI_VENDOR_ID_DEC;
+    k->device_id = PCI_DEVICE_ID_DEC_21154;
+    k->config_write = pci_bridge_write_config;
+    k->is_bridge = true;
+    dc->desc = "DEC 21154 PCI-PCI bridge";
+    dc->reset = pci_bridge_reset;
+    dc->vmsd = &vmstate_pci_device;
+}
+
+static const TypeInfo dec_21154_pci_bridge_info = {
+    .name          = "dec-21154-p2p-bridge",
+    .parent        = TYPE_PCI_BRIDGE,
+    .instance_size = sizeof(PCIBridge),
+    .class_init    = dec_21154_pci_bridge_class_init,
+    .interfaces = (InterfaceInfo[]) {
+        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
+        { },
+    },
+};
+
+PCIBus *pci_dec_21154_init(PCIBus *parent_bus, int devfn)
+{
+    PCIDevice *dev;
+    PCIBridge *br;
+
+    dev = pci_new_multifunction(devfn, false, "dec-21154-p2p-bridge");
+    br = PCI_BRIDGE(dev);
+    pci_bridge_map_irq(br, "DEC 21154 PCI-PCI bridge", dec_map_irq);
+    pci_realize_and_unref(dev, parent_bus, &error_fatal);
+    return pci_bridge_get_sec_bus(br);
+}
+
+static void pci_dec_21154_device_realize(DeviceState *dev, Error **errp)
+{
+    PCIHostState *phb;
+    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+
+    phb = PCI_HOST_BRIDGE(dev);
+
+    memory_region_init_io(&phb->conf_mem, OBJECT(dev), &pci_host_conf_le_ops,
+                          dev, "pci-conf-idx", 0x1000);
+    memory_region_init_io(&phb->data_mem, OBJECT(dev), &pci_host_data_le_ops,
+                          dev, "pci-data-idx", 0x1000);
+    sysbus_init_mmio(sbd, &phb->conf_mem);
+    sysbus_init_mmio(sbd, &phb->data_mem);
+}
+
+static void dec_21154_pci_host_realize(PCIDevice *d, Error **errp)
+{
+    /* PCI2PCI bridge same values as PearPC - check this */
+}
+
+static void dec_21154_pci_host_class_init(ObjectClass *klass, void *data)
+{
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+    k->realize = dec_21154_pci_host_realize;
+    k->vendor_id = PCI_VENDOR_ID_DEC;
+    k->device_id = PCI_DEVICE_ID_DEC_21154;
+    k->revision = 0x02;
+    k->class_id = PCI_CLASS_BRIDGE_PCI;
+    k->is_bridge = true;
+    /*
+     * PCI-facing part of the host bridge, not usable without the
+     * host-facing part, which can't be device_add'ed, yet.
+     */
+    dc->user_creatable = false;
+}
+
+static const TypeInfo dec_21154_pci_host_info = {
+    .name          = "dec-21154",
+    .parent        = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(PCIDevice),
+    .class_init    = dec_21154_pci_host_class_init,
+    .interfaces = (InterfaceInfo[]) {
+        { INTERFACE_CONVENTIONAL_PCI_DEVICE },
+        { },
+    },
+};
+
+static void pci_dec_21154_device_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = pci_dec_21154_device_realize;
+}
+
+static const TypeInfo pci_dec_21154_device_info = {
+    .name          = TYPE_DEC_21154,
+    .parent        = TYPE_PCI_HOST_BRIDGE,
+    .instance_size = sizeof(DECState),
+    .class_init    = pci_dec_21154_device_class_init,
+};
+
+static void dec_register_types(void)
+{
+    type_register_static(&pci_dec_21154_device_info);
+    type_register_static(&dec_21154_pci_host_info);
+    type_register_static(&dec_21154_pci_bridge_info);
+}
+
+type_init(dec_register_types)