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, 27 insertions, 0 deletions

diff --git a/linux-user/riscv/target_cpu.h b/linux-user/riscv/target_cpu.h
new file mode 100644
index 000000000..9c642367a
--- /dev/null
+++ b/linux-user/riscv/target_cpu.h
@@ -0,0 +1,27 @@
+#ifndef RISCV_TARGET_CPU_H
+#define RISCV_TARGET_CPU_H
+
+static inline void cpu_clone_regs_child(CPURISCVState *env, target_ulong newsp,
+                                        unsigned flags)
+{
+    if (newsp) {
+        env->gpr[xSP] = newsp;
+    }
+
+    env->gpr[xA0] = 0;
+}
+
+static inline void cpu_clone_regs_parent(CPURISCVState *env, unsigned flags)
+{
+}
+
+static inline void cpu_set_tls(CPURISCVState *env, target_ulong newtls)
+{
+    env->gpr[xTP] = newtls;
+}
+
+static inline abi_ulong get_sp_from_cpustate(CPURISCVState *state)
+{
+   return state->gpr[xSP];
+}
+#endif