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, 62 insertions, 0 deletions

diff --git a/linux-user/sparc/target_syscall.h b/linux-user/sparc/target_syscall.h
new file mode 100644
index 000000000..087b39d39
--- /dev/null
+++ b/linux-user/sparc/target_syscall.h
@@ -0,0 +1,62 @@
+#ifndef SPARC_TARGET_SYSCALL_H
+#define SPARC_TARGET_SYSCALL_H
+
+#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
+struct target_pt_regs {
+    abi_ulong u_regs[16];
+    abi_ulong tstate;
+    abi_ulong pc;
+    abi_ulong npc;
+    uint32_t y;
+    uint32_t magic;
+};
+#else
+struct target_pt_regs {
+    abi_ulong psr;
+    abi_ulong pc;
+    abi_ulong npc;
+    abi_ulong y;
+    abi_ulong u_regs[16];
+};
+#endif
+
+#ifdef TARGET_SPARC64
+# define UNAME_MACHINE "sparc64"
+#else
+# define UNAME_MACHINE "sparc"
+#endif
+#define UNAME_MINIMUM_RELEASE "2.6.32"
+
+/*
+ * SPARC kernels don't define this in their Kconfig, but they have the
+ * same ABI as if they did, implemented by sparc-specific code which fishes
+ * directly in the u_regs() struct for half the parameters in sparc_do_fork()
+ * and copy_thread().
+ */
+#define TARGET_CLONE_BACKWARDS
+#define TARGET_MINSIGSTKSZ      4096
+#define TARGET_MCL_CURRENT 0x2000
+#define TARGET_MCL_FUTURE  0x4000
+#define TARGET_MCL_ONFAULT 0x8000
+
+/*
+ * For SPARC SHMLBA is determined at runtime in the kernel, and
+ * libc has to runtime-detect it using the hwcaps.
+ * See glibc sysdeps/unix/sysv/linux/sparc/getshmlba.
+ */
+#define TARGET_FORCE_SHMLBA
+
+static inline abi_ulong target_shmlba(CPUSPARCState *env)
+{
+#ifdef TARGET_SPARC64
+    return MAX(TARGET_PAGE_SIZE, 16 * 1024);
+#else
+    if (!(env->def.features & CPU_FEATURE_FLUSH)) {
+        return 64 * 1024;
+    } else {
+        return 256 * 1024;
+    }
+#endif
+}
+
+#endif /* SPARC_TARGET_SYSCALL_H */