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, 61 insertions, 0 deletions

diff --git a/target/riscv/internals.h b/target/riscv/internals.h
new file mode 100644
index 000000000..b15ad394b
--- /dev/null
+++ b/target/riscv/internals.h
@@ -0,0 +1,61 @@
+/*
+ * QEMU RISC-V CPU -- internal functions and types
+ *
+ * Copyright (c) 2020 T-Head Semiconductor Co., Ltd. All rights reserved.
+ *
+ * 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/>.
+ */
+
+#ifndef RISCV_CPU_INTERNALS_H
+#define RISCV_CPU_INTERNALS_H
+
+#include "hw/registerfields.h"
+
+/* share data between vector helpers and decode code */
+FIELD(VDATA, MLEN, 0, 8)
+FIELD(VDATA, VM, 8, 1)
+FIELD(VDATA, LMUL, 9, 2)
+FIELD(VDATA, NF, 11, 4)
+FIELD(VDATA, WD, 11, 1)
+
+/* float point classify helpers */
+target_ulong fclass_h(uint64_t frs1);
+target_ulong fclass_s(uint64_t frs1);
+target_ulong fclass_d(uint64_t frs1);
+
+#define SEW8  0
+#define SEW16 1
+#define SEW32 2
+#define SEW64 3
+
+#ifndef CONFIG_USER_ONLY
+extern const VMStateDescription vmstate_riscv_cpu;
+#endif
+
+static inline uint64_t nanbox_s(float32 f)
+{
+    return f | MAKE_64BIT_MASK(32, 32);
+}
+
+static inline float32 check_nanbox_s(uint64_t f)
+{
+    uint64_t mask = MAKE_64BIT_MASK(32, 32);
+
+    if (likely((f & mask) == mask)) {
+        return (uint32_t)f;
+    } else {
+        return 0x7fc00000u; /* default qnan */
+    }
+}
+
+#endif