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, 99 insertions, 0 deletions

diff --git a/hw/misc/sifive_test.c b/hw/misc/sifive_test.c
new file mode 100644
index 000000000..56df45bfe
--- /dev/null
+++ b/hw/misc/sifive_test.c
@@ -0,0 +1,99 @@
+/*
+ * QEMU SiFive Test Finisher
+ *
+ * Copyright (c) 2018 SiFive, Inc.
+ *
+ * Test finisher memory mapped device used to exit simulation
+ *
+ * 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 later, 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/sysbus.h"
+#include "qapi/error.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "sysemu/runstate.h"
+#include "hw/misc/sifive_test.h"
+
+static uint64_t sifive_test_read(void *opaque, hwaddr addr, unsigned int size)
+{
+    return 0;
+}
+
+static void sifive_test_write(void *opaque, hwaddr addr,
+           uint64_t val64, unsigned int size)
+{
+    if (addr == 0) {
+        int status = val64 & 0xffff;
+        int code = (val64 >> 16) & 0xffff;
+        switch (status) {
+        case FINISHER_FAIL:
+            exit(code);
+        case FINISHER_PASS:
+            exit(0);
+        case FINISHER_RESET:
+            qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
+            return;
+        default:
+            break;
+        }
+    }
+    qemu_log_mask(LOG_GUEST_ERROR, "%s: write: addr=0x%x val=0x%016" PRIx64 "\n",
+                  __func__, (int)addr, val64);
+}
+
+static const MemoryRegionOps sifive_test_ops = {
+    .read = sifive_test_read,
+    .write = sifive_test_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .valid = {
+        .min_access_size = 2,
+        .max_access_size = 4
+    }
+};
+
+static void sifive_test_init(Object *obj)
+{
+    SiFiveTestState *s = SIFIVE_TEST(obj);
+
+    memory_region_init_io(&s->mmio, obj, &sifive_test_ops, s,
+                          TYPE_SIFIVE_TEST, 0x1000);
+    sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
+}
+
+static const TypeInfo sifive_test_info = {
+    .name          = TYPE_SIFIVE_TEST,
+    .parent        = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(SiFiveTestState),
+    .instance_init = sifive_test_init,
+};
+
+static void sifive_test_register_types(void)
+{
+    type_register_static(&sifive_test_info);
+}
+
+type_init(sifive_test_register_types)
+
+
+/*
+ * Create Test device.
+ */
+DeviceState *sifive_test_create(hwaddr addr)
+{
+    DeviceState *dev = qdev_new(TYPE_SIFIVE_TEST);
+    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
+    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, addr);
+    return dev;
+}