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, 203 insertions, 0 deletions

diff --git a/hw/misc/arm_l2x0.c b/hw/misc/arm_l2x0.c
new file mode 100644
index 000000000..75c3eb898
--- /dev/null
+++ b/hw/misc/arm_l2x0.c
@@ -0,0 +1,203 @@
+/*
+ * ARM dummy L210, L220, PL310 cache controller.
+ *
+ * Copyright (c) 2010-2012 Calxeda
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or any later version, as published by the Free Software
+ * Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "hw/qdev-properties.h"
+#include "hw/sysbus.h"
+#include "migration/vmstate.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "qom/object.h"
+
+/* L2C-310 r3p2 */
+#define CACHE_ID 0x410000c8
+
+#define TYPE_ARM_L2X0 "l2x0"
+OBJECT_DECLARE_SIMPLE_TYPE(L2x0State, ARM_L2X0)
+
+struct L2x0State {
+    SysBusDevice parent_obj;
+
+    MemoryRegion iomem;
+    uint32_t cache_type;
+    uint32_t ctrl;
+    uint32_t aux_ctrl;
+    uint32_t data_ctrl;
+    uint32_t tag_ctrl;
+    uint32_t filter_start;
+    uint32_t filter_end;
+};
+
+static const VMStateDescription vmstate_l2x0 = {
+    .name = "l2x0",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(ctrl, L2x0State),
+        VMSTATE_UINT32(aux_ctrl, L2x0State),
+        VMSTATE_UINT32(data_ctrl, L2x0State),
+        VMSTATE_UINT32(tag_ctrl, L2x0State),
+        VMSTATE_UINT32(filter_start, L2x0State),
+        VMSTATE_UINT32(filter_end, L2x0State),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+
+static uint64_t l2x0_priv_read(void *opaque, hwaddr offset,
+                               unsigned size)
+{
+    uint32_t cache_data;
+    L2x0State *s = (L2x0State *)opaque;
+    offset &= 0xfff;
+    if (offset >= 0x730 && offset < 0x800) {
+        return 0; /* cache ops complete */
+    }
+    switch (offset) {
+    case 0:
+        return CACHE_ID;
+    case 0x4:
+        /* aux_ctrl values affect cache_type values */
+        cache_data = (s->aux_ctrl & (7 << 17)) >> 15;
+        cache_data |= (s->aux_ctrl & (1 << 16)) >> 16;
+        return s->cache_type |= (cache_data << 18) | (cache_data << 6);
+    case 0x100:
+        return s->ctrl;
+    case 0x104:
+        return s->aux_ctrl;
+    case 0x108:
+        return s->tag_ctrl;
+    case 0x10C:
+        return s->data_ctrl;
+    case 0xC00:
+        return s->filter_start;
+    case 0xC04:
+        return s->filter_end;
+    case 0xF40:
+        return 0;
+    case 0xF60:
+        return 0;
+    case 0xF80:
+        return 0;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "l2x0_priv_read: Bad offset %x\n", (int)offset);
+        break;
+    }
+    return 0;
+}
+
+static void l2x0_priv_write(void *opaque, hwaddr offset,
+                            uint64_t value, unsigned size)
+{
+    L2x0State *s = (L2x0State *)opaque;
+    offset &= 0xfff;
+    if (offset >= 0x730 && offset < 0x800) {
+        /* ignore */
+        return;
+    }
+    switch (offset) {
+    case 0x100:
+        s->ctrl = value & 1;
+        break;
+    case 0x104:
+        s->aux_ctrl = value;
+        break;
+    case 0x108:
+        s->tag_ctrl = value;
+        break;
+    case 0x10C:
+        s->data_ctrl = value;
+        break;
+    case 0xC00:
+        s->filter_start = value;
+        break;
+    case 0xC04:
+        s->filter_end = value;
+        break;
+    case 0xF40:
+        return;
+    case 0xF60:
+        return;
+    case 0xF80:
+        return;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "l2x0_priv_write: Bad offset %x\n", (int)offset);
+        break;
+    }
+}
+
+static void l2x0_priv_reset(DeviceState *dev)
+{
+    L2x0State *s = ARM_L2X0(dev);
+
+    s->ctrl = 0;
+    s->aux_ctrl = 0x02020000;
+    s->tag_ctrl = 0;
+    s->data_ctrl = 0;
+    s->filter_start = 0;
+    s->filter_end = 0;
+}
+
+static const MemoryRegionOps l2x0_mem_ops = {
+    .read = l2x0_priv_read,
+    .write = l2x0_priv_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+ };
+
+static void l2x0_priv_init(Object *obj)
+{
+    L2x0State *s = ARM_L2X0(obj);
+    SysBusDevice *dev = SYS_BUS_DEVICE(obj);
+
+    memory_region_init_io(&s->iomem, obj, &l2x0_mem_ops, s,
+                          "l2x0_cc", 0x1000);
+    sysbus_init_mmio(dev, &s->iomem);
+}
+
+static Property l2x0_properties[] = {
+    DEFINE_PROP_UINT32("cache-type", L2x0State, cache_type, 0x1c100100),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void l2x0_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->vmsd = &vmstate_l2x0;
+    device_class_set_props(dc, l2x0_properties);
+    dc->reset = l2x0_priv_reset;
+}
+
+static const TypeInfo l2x0_info = {
+    .name = TYPE_ARM_L2X0,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(L2x0State),
+    .instance_init = l2x0_priv_init,
+    .class_init = l2x0_class_init,
+};
+
+static void l2x0_register_types(void)
+{
+    type_register_static(&l2x0_info);
+}
+
+type_init(l2x0_register_types)