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, 246 insertions, 0 deletions

diff --git a/target/rx/cpu.c b/target/rx/cpu.c
new file mode 100644
index 000000000..25a4aa297
--- /dev/null
+++ b/target/rx/cpu.c
@@ -0,0 +1,246 @@
+/*
+ * QEMU RX CPU
+ *
+ * Copyright (c) 2019 Yoshinori Sato
+ *
+ * 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 "qemu/qemu-print.h"
+#include "qapi/error.h"
+#include "cpu.h"
+#include "qemu-common.h"
+#include "migration/vmstate.h"
+#include "exec/exec-all.h"
+#include "hw/loader.h"
+#include "fpu/softfloat.h"
+
+static void rx_cpu_set_pc(CPUState *cs, vaddr value)
+{
+    RXCPU *cpu = RX_CPU(cs);
+
+    cpu->env.pc = value;
+}
+
+static void rx_cpu_synchronize_from_tb(CPUState *cs,
+                                       const TranslationBlock *tb)
+{
+    RXCPU *cpu = RX_CPU(cs);
+
+    cpu->env.pc = tb->pc;
+}
+
+static bool rx_cpu_has_work(CPUState *cs)
+{
+    return cs->interrupt_request &
+        (CPU_INTERRUPT_HARD | CPU_INTERRUPT_FIR);
+}
+
+static void rx_cpu_reset(DeviceState *dev)
+{
+    RXCPU *cpu = RX_CPU(dev);
+    RXCPUClass *rcc = RX_CPU_GET_CLASS(cpu);
+    CPURXState *env = &cpu->env;
+    uint32_t *resetvec;
+
+    rcc->parent_reset(dev);
+
+    memset(env, 0, offsetof(CPURXState, end_reset_fields));
+
+    resetvec = rom_ptr(0xfffffffc, 4);
+    if (resetvec) {
+        /* In the case of kernel, it is ignored because it is not set. */
+        env->pc = ldl_p(resetvec);
+    }
+    rx_cpu_unpack_psw(env, 0, 1);
+    env->regs[0] = env->isp = env->usp = 0;
+    env->fpsw = 0;
+    set_flush_to_zero(1, &env->fp_status);
+    set_flush_inputs_to_zero(1, &env->fp_status);
+}
+
+static void rx_cpu_list_entry(gpointer data, gpointer user_data)
+{
+    ObjectClass *oc = data;
+
+    qemu_printf("  %s\n", object_class_get_name(oc));
+}
+
+void rx_cpu_list(void)
+{
+    GSList *list;
+    list = object_class_get_list_sorted(TYPE_RX_CPU, false);
+    qemu_printf("Available CPUs:\n");
+    g_slist_foreach(list, rx_cpu_list_entry, NULL);
+    g_slist_free(list);
+}
+
+static ObjectClass *rx_cpu_class_by_name(const char *cpu_model)
+{
+    ObjectClass *oc;
+    char *typename;
+
+    oc = object_class_by_name(cpu_model);
+    if (oc != NULL && object_class_dynamic_cast(oc, TYPE_RX_CPU) != NULL &&
+        !object_class_is_abstract(oc)) {
+        return oc;
+    }
+    typename = g_strdup_printf(RX_CPU_TYPE_NAME("%s"), cpu_model);
+    oc = object_class_by_name(typename);
+    g_free(typename);
+    if (oc != NULL && object_class_is_abstract(oc)) {
+        oc = NULL;
+    }
+
+    return oc;
+}
+
+static void rx_cpu_realize(DeviceState *dev, Error **errp)
+{
+    CPUState *cs = CPU(dev);
+    RXCPUClass *rcc = RX_CPU_GET_CLASS(dev);
+    Error *local_err = NULL;
+
+    cpu_exec_realizefn(cs, &local_err);
+    if (local_err != NULL) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    qemu_init_vcpu(cs);
+    cpu_reset(cs);
+
+    rcc->parent_realize(dev, errp);
+}
+
+static void rx_cpu_set_irq(void *opaque, int no, int request)
+{
+    RXCPU *cpu = opaque;
+    CPUState *cs = CPU(cpu);
+    int irq = request & 0xff;
+
+    static const int mask[] = {
+        [RX_CPU_IRQ] = CPU_INTERRUPT_HARD,
+        [RX_CPU_FIR] = CPU_INTERRUPT_FIR,
+    };
+    if (irq) {
+        cpu->env.req_irq = irq;
+        cpu->env.req_ipl = (request >> 8) & 0x0f;
+        cpu_interrupt(cs, mask[no]);
+    } else {
+        cpu_reset_interrupt(cs, mask[no]);
+    }
+}
+
+static void rx_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
+{
+    info->mach = bfd_mach_rx;
+    info->print_insn = print_insn_rx;
+}
+
+static bool rx_cpu_tlb_fill(CPUState *cs, vaddr addr, int size,
+                            MMUAccessType access_type, int mmu_idx,
+                            bool probe, uintptr_t retaddr)
+{
+    uint32_t address, physical, prot;
+
+    /* Linear mapping */
+    address = physical = addr & TARGET_PAGE_MASK;
+    prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
+    tlb_set_page(cs, address, physical, prot, mmu_idx, TARGET_PAGE_SIZE);
+    return true;
+}
+
+static void rx_cpu_init(Object *obj)
+{
+    CPUState *cs = CPU(obj);
+    RXCPU *cpu = RX_CPU(obj);
+    CPURXState *env = &cpu->env;
+
+    cpu_set_cpustate_pointers(cpu);
+    cs->env_ptr = env;
+    qdev_init_gpio_in(DEVICE(cpu), rx_cpu_set_irq, 2);
+}
+
+#ifndef CONFIG_USER_ONLY
+#include "hw/core/sysemu-cpu-ops.h"
+
+static const struct SysemuCPUOps rx_sysemu_ops = {
+    .get_phys_page_debug = rx_cpu_get_phys_page_debug,
+};
+#endif
+
+#include "hw/core/tcg-cpu-ops.h"
+
+static const struct TCGCPUOps rx_tcg_ops = {
+    .initialize = rx_translate_init,
+    .synchronize_from_tb = rx_cpu_synchronize_from_tb,
+    .tlb_fill = rx_cpu_tlb_fill,
+
+#ifndef CONFIG_USER_ONLY
+    .cpu_exec_interrupt = rx_cpu_exec_interrupt,
+    .do_interrupt = rx_cpu_do_interrupt,
+#endif /* !CONFIG_USER_ONLY */
+};
+
+static void rx_cpu_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    CPUClass *cc = CPU_CLASS(klass);
+    RXCPUClass *rcc = RX_CPU_CLASS(klass);
+
+    device_class_set_parent_realize(dc, rx_cpu_realize,
+                                    &rcc->parent_realize);
+    device_class_set_parent_reset(dc, rx_cpu_reset,
+                                  &rcc->parent_reset);
+
+    cc->class_by_name = rx_cpu_class_by_name;
+    cc->has_work = rx_cpu_has_work;
+    cc->dump_state = rx_cpu_dump_state;
+    cc->set_pc = rx_cpu_set_pc;
+
+#ifndef CONFIG_USER_ONLY
+    cc->sysemu_ops = &rx_sysemu_ops;
+#endif
+    cc->gdb_read_register = rx_cpu_gdb_read_register;
+    cc->gdb_write_register = rx_cpu_gdb_write_register;
+    cc->disas_set_info = rx_cpu_disas_set_info;
+
+    cc->gdb_num_core_regs = 26;
+    cc->gdb_core_xml_file = "rx-core.xml";
+    cc->tcg_ops = &rx_tcg_ops;
+}
+
+static const TypeInfo rx_cpu_info = {
+    .name = TYPE_RX_CPU,
+    .parent = TYPE_CPU,
+    .instance_size = sizeof(RXCPU),
+    .instance_init = rx_cpu_init,
+    .abstract = true,
+    .class_size = sizeof(RXCPUClass),
+    .class_init = rx_cpu_class_init,
+};
+
+static const TypeInfo rx62n_rx_cpu_info = {
+    .name = TYPE_RX62N_CPU,
+    .parent = TYPE_RX_CPU,
+};
+
+static void rx_cpu_register_types(void)
+{
+    type_register_static(&rx_cpu_info);
+    type_register_static(&rx62n_rx_cpu_info);
+}
+
+type_init(rx_cpu_register_types)