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, 266 insertions, 0 deletions

diff --git a/hw/misc/nrf51_rng.c b/hw/misc/nrf51_rng.c
new file mode 100644
index 000000000..fc86e1b69
--- /dev/null
+++ b/hw/misc/nrf51_rng.c
@@ -0,0 +1,266 @@
+/*
+ * nRF51 Random Number Generator
+ *
+ * Reference Manual: http://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf
+ *
+ * Copyright 2018 Steffen Görtz <contrib@steffen-goertz.de>
+ *
+ * This code is licensed under the GPL version 2 or later.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+#include "qapi/error.h"
+#include "hw/arm/nrf51.h"
+#include "hw/irq.h"
+#include "hw/misc/nrf51_rng.h"
+#include "hw/qdev-properties.h"
+#include "migration/vmstate.h"
+#include "qemu/guest-random.h"
+
+static void update_irq(NRF51RNGState *s)
+{
+    bool irq = s->interrupt_enabled && s->event_valrdy;
+    qemu_set_irq(s->irq, irq);
+}
+
+static uint64_t rng_read(void *opaque, hwaddr offset, unsigned int size)
+{
+    NRF51RNGState *s = NRF51_RNG(opaque);
+    uint64_t r = 0;
+
+    switch (offset) {
+    case NRF51_RNG_EVENT_VALRDY:
+        r = s->event_valrdy;
+        break;
+    case NRF51_RNG_REG_SHORTS:
+        r = s->shortcut_stop_on_valrdy;
+        break;
+    case NRF51_RNG_REG_INTEN:
+    case NRF51_RNG_REG_INTENSET:
+    case NRF51_RNG_REG_INTENCLR:
+        r = s->interrupt_enabled;
+        break;
+    case NRF51_RNG_REG_CONFIG:
+        r = s->filter_enabled;
+        break;
+    case NRF51_RNG_REG_VALUE:
+        r = s->value;
+        break;
+
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: bad read offset 0x%" HWADDR_PRIx "\n",
+                      __func__, offset);
+    }
+
+    return r;
+}
+
+static int64_t calc_next_timeout(NRF51RNGState *s)
+{
+    int64_t timeout = qemu_clock_get_us(QEMU_CLOCK_VIRTUAL);
+    if (s->filter_enabled) {
+        timeout += s->period_filtered_us;
+    } else {
+        timeout += s->period_unfiltered_us;
+    }
+
+    return timeout;
+}
+
+
+static void rng_update_timer(NRF51RNGState *s)
+{
+    if (s->active) {
+        timer_mod(&s->timer, calc_next_timeout(s));
+    } else {
+        timer_del(&s->timer);
+    }
+}
+
+
+static void rng_write(void *opaque, hwaddr offset,
+                       uint64_t value, unsigned int size)
+{
+    NRF51RNGState *s = NRF51_RNG(opaque);
+
+    switch (offset) {
+    case NRF51_RNG_TASK_START:
+        if (value == NRF51_TRIGGER_TASK) {
+            s->active = 1;
+            rng_update_timer(s);
+        }
+        break;
+    case NRF51_RNG_TASK_STOP:
+        if (value == NRF51_TRIGGER_TASK) {
+            s->active = 0;
+            rng_update_timer(s);
+        }
+        break;
+    case NRF51_RNG_EVENT_VALRDY:
+        if (value == NRF51_EVENT_CLEAR) {
+            s->event_valrdy = 0;
+        }
+        break;
+    case NRF51_RNG_REG_SHORTS:
+        s->shortcut_stop_on_valrdy =
+                (value & BIT_MASK(NRF51_RNG_REG_SHORTS_VALRDY_STOP)) ? 1 : 0;
+        break;
+    case NRF51_RNG_REG_INTEN:
+        s->interrupt_enabled =
+                (value & BIT_MASK(NRF51_RNG_REG_INTEN_VALRDY)) ? 1 : 0;
+        break;
+    case NRF51_RNG_REG_INTENSET:
+        if (value & BIT_MASK(NRF51_RNG_REG_INTEN_VALRDY)) {
+            s->interrupt_enabled = 1;
+        }
+        break;
+    case NRF51_RNG_REG_INTENCLR:
+        if (value & BIT_MASK(NRF51_RNG_REG_INTEN_VALRDY)) {
+            s->interrupt_enabled = 0;
+        }
+        break;
+    case NRF51_RNG_REG_CONFIG:
+        s->filter_enabled =
+                      (value & BIT_MASK(NRF51_RNG_REG_CONFIG_DECEN)) ? 1 : 0;
+        break;
+
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: bad write offset 0x%" HWADDR_PRIx "\n",
+                      __func__, offset);
+    }
+
+    update_irq(s);
+}
+
+static const MemoryRegionOps rng_ops = {
+    .read =  rng_read,
+    .write = rng_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .impl.min_access_size = 4,
+    .impl.max_access_size = 4
+};
+
+static void nrf51_rng_timer_expire(void *opaque)
+{
+    NRF51RNGState *s = NRF51_RNG(opaque);
+
+    qemu_guest_getrandom_nofail(&s->value, 1);
+
+    s->event_valrdy = 1;
+    qemu_set_irq(s->eep_valrdy, 1);
+
+    if (s->shortcut_stop_on_valrdy) {
+        s->active = 0;
+    }
+
+    rng_update_timer(s);
+    update_irq(s);
+}
+
+static void nrf51_rng_tep_start(void *opaque, int n, int level)
+{
+    NRF51RNGState *s = NRF51_RNG(opaque);
+
+    if (level) {
+        s->active = 1;
+        rng_update_timer(s);
+    }
+}
+
+static void nrf51_rng_tep_stop(void *opaque, int n, int level)
+{
+    NRF51RNGState *s = NRF51_RNG(opaque);
+
+    if (level) {
+        s->active = 0;
+        rng_update_timer(s);
+    }
+}
+
+
+static void nrf51_rng_init(Object *obj)
+{
+    NRF51RNGState *s = NRF51_RNG(obj);
+    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+
+    memory_region_init_io(&s->mmio, obj, &rng_ops, s,
+            TYPE_NRF51_RNG, NRF51_RNG_SIZE);
+    sysbus_init_mmio(sbd, &s->mmio);
+
+    timer_init_us(&s->timer, QEMU_CLOCK_VIRTUAL, nrf51_rng_timer_expire, s);
+
+    sysbus_init_irq(sbd, &s->irq);
+
+    /* Tasks */
+    qdev_init_gpio_in_named(DEVICE(s), nrf51_rng_tep_start, "tep_start", 1);
+    qdev_init_gpio_in_named(DEVICE(s), nrf51_rng_tep_stop, "tep_stop", 1);
+
+    /* Events */
+    qdev_init_gpio_out_named(DEVICE(s), &s->eep_valrdy, "eep_valrdy", 1);
+}
+
+static void nrf51_rng_reset(DeviceState *dev)
+{
+    NRF51RNGState *s = NRF51_RNG(dev);
+
+    s->value = 0;
+    s->active = 0;
+    s->event_valrdy = 0;
+    s->shortcut_stop_on_valrdy = 0;
+    s->interrupt_enabled = 0;
+    s->filter_enabled = 0;
+
+    rng_update_timer(s);
+}
+
+
+static Property nrf51_rng_properties[] = {
+    DEFINE_PROP_UINT16("period_unfiltered_us", NRF51RNGState,
+            period_unfiltered_us, 167),
+    DEFINE_PROP_UINT16("period_filtered_us", NRF51RNGState,
+            period_filtered_us, 660),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static const VMStateDescription vmstate_rng = {
+    .name = "nrf51_soc.rng",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(active, NRF51RNGState),
+        VMSTATE_UINT32(event_valrdy, NRF51RNGState),
+        VMSTATE_UINT32(shortcut_stop_on_valrdy, NRF51RNGState),
+        VMSTATE_UINT32(interrupt_enabled, NRF51RNGState),
+        VMSTATE_UINT32(filter_enabled, NRF51RNGState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void nrf51_rng_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    device_class_set_props(dc, nrf51_rng_properties);
+    dc->vmsd = &vmstate_rng;
+    dc->reset = nrf51_rng_reset;
+}
+
+static const TypeInfo nrf51_rng_info = {
+    .name = TYPE_NRF51_RNG,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(NRF51RNGState),
+    .instance_init = nrf51_rng_init,
+    .class_init = nrf51_rng_class_init
+};
+
+static void nrf51_rng_register_types(void)
+{
+    type_register_static(&nrf51_rng_info);
+}
+
+type_init(nrf51_rng_register_types)