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, 32 insertions, 0 deletions

diff --git a/linux-user/xtensa/target_cpu.h b/linux-user/xtensa/target_cpu.h
new file mode 100644
index 000000000..0c77bafd6
--- /dev/null
+++ b/linux-user/xtensa/target_cpu.h
@@ -0,0 +1,32 @@
+/*
+ * Xtensa-specific CPU ABI and functions for linux-user
+ */
+#ifndef XTENSA_TARGET_CPU_H
+#define XTENSA_TARGET_CPU_H
+
+static inline void cpu_clone_regs_child(CPUXtensaState *env,
+                                        target_ulong newsp,
+                                        unsigned flags)
+{
+    if (newsp) {
+        env->regs[1] = newsp;
+        env->sregs[WINDOW_BASE] = 0;
+        env->sregs[WINDOW_START] = 0x1;
+    }
+    env->regs[2] = 0;
+}
+
+static inline void cpu_clone_regs_parent(CPUXtensaState *env, unsigned flags)
+{
+}
+
+static inline void cpu_set_tls(CPUXtensaState *env, target_ulong newtls)
+{
+    env->uregs[THREADPTR] = newtls;
+}
+
+static inline abi_ulong get_sp_from_cpustate(CPUXtensaState *state)
+{
+    return state->regs[1];
+}
+#endif