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, 135 insertions, 0 deletions

diff --git a/hw/misc/armsse-cpuid.c b/hw/misc/armsse-cpuid.c
new file mode 100644
index 000000000..e785a0905
--- /dev/null
+++ b/hw/misc/armsse-cpuid.c
@@ -0,0 +1,135 @@
+/*
+ * ARM SSE-200 CPU_IDENTITY register block
+ *
+ * Copyright (c) 2019 Linaro Limited
+ * Written by Peter Maydell
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 or
+ *  (at your option) any later version.
+ */
+
+/*
+ * This is a model of the "CPU_IDENTITY" register block which is part of the
+ * Arm SSE-200 and documented in
+ * https://developer.arm.com/documentation/101104/latest/
+ *
+ * It consists of one read-only CPUID register (set by QOM property), plus the
+ * usual ID registers.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "trace.h"
+#include "qapi/error.h"
+#include "hw/sysbus.h"
+#include "hw/registerfields.h"
+#include "hw/misc/armsse-cpuid.h"
+#include "hw/qdev-properties.h"
+
+REG32(CPUID, 0x0)
+REG32(PID4, 0xfd0)
+REG32(PID5, 0xfd4)
+REG32(PID6, 0xfd8)
+REG32(PID7, 0xfdc)
+REG32(PID0, 0xfe0)
+REG32(PID1, 0xfe4)
+REG32(PID2, 0xfe8)
+REG32(PID3, 0xfec)
+REG32(CID0, 0xff0)
+REG32(CID1, 0xff4)
+REG32(CID2, 0xff8)
+REG32(CID3, 0xffc)
+
+/* PID/CID values */
+static const int sysinfo_id[] = {
+    0x04, 0x00, 0x00, 0x00, /* PID4..PID7 */
+    0x58, 0xb8, 0x0b, 0x00, /* PID0..PID3 */
+    0x0d, 0xf0, 0x05, 0xb1, /* CID0..CID3 */
+};
+
+static uint64_t armsse_cpuid_read(void *opaque, hwaddr offset,
+                                    unsigned size)
+{
+    ARMSSECPUID *s = ARMSSE_CPUID(opaque);
+    uint64_t r;
+
+    switch (offset) {
+    case A_CPUID:
+        r = s->cpuid;
+        break;
+    case A_PID4 ... A_CID3:
+        r = sysinfo_id[(offset - A_PID4) / 4];
+        break;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "SSE CPU_IDENTITY read: bad offset 0x%x\n", (int)offset);
+        r = 0;
+        break;
+    }
+    trace_armsse_cpuid_read(offset, r, size);
+    return r;
+}
+
+static void armsse_cpuid_write(void *opaque, hwaddr offset,
+                                 uint64_t value, unsigned size)
+{
+    trace_armsse_cpuid_write(offset, value, size);
+
+    qemu_log_mask(LOG_GUEST_ERROR,
+                  "SSE CPU_IDENTITY: write to RO offset 0x%x\n", (int)offset);
+}
+
+static const MemoryRegionOps armsse_cpuid_ops = {
+    .read = armsse_cpuid_read,
+    .write = armsse_cpuid_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    /* byte/halfword accesses are just zero-padded on reads and writes */
+    .impl.min_access_size = 4,
+    .impl.max_access_size = 4,
+    .valid.min_access_size = 1,
+    .valid.max_access_size = 4,
+};
+
+static Property armsse_cpuid_props[] = {
+    DEFINE_PROP_UINT32("CPUID", ARMSSECPUID, cpuid, 0),
+    DEFINE_PROP_END_OF_LIST()
+};
+
+static void armsse_cpuid_init(Object *obj)
+{
+    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+    ARMSSECPUID *s = ARMSSE_CPUID(obj);
+
+    memory_region_init_io(&s->iomem, obj, &armsse_cpuid_ops,
+                          s, "armsse-cpuid", 0x1000);
+    sysbus_init_mmio(sbd, &s->iomem);
+}
+
+static void armsse_cpuid_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    /*
+     * This device has no guest-modifiable state and so it
+     * does not need a reset function or VMState.
+     */
+
+    device_class_set_props(dc, armsse_cpuid_props);
+}
+
+static const TypeInfo armsse_cpuid_info = {
+    .name = TYPE_ARMSSE_CPUID,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(ARMSSECPUID),
+    .instance_init = armsse_cpuid_init,
+    .class_init = armsse_cpuid_class_init,
+};
+
+static void armsse_cpuid_register_types(void)
+{
+    type_register_static(&armsse_cpuid_info);
+}
+
+type_init(armsse_cpuid_register_types);