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, 208 insertions, 0 deletions

diff --git a/target/ppc/timebase_helper.c b/target/ppc/timebase_helper.c
new file mode 100644
index 000000000..8ff4080eb
--- /dev/null
+++ b/target/ppc/timebase_helper.c
@@ -0,0 +1,208 @@
+/*
+ *  PowerPC emulation helpers for QEMU.
+ *
+ *  Copyright (c) 2003-2007 Jocelyn Mayer
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/helper-proto.h"
+#include "exec/exec-all.h"
+#include "qemu/log.h"
+#include "qemu/main-loop.h"
+
+/*****************************************************************************/
+/* SPR accesses */
+
+target_ulong helper_load_tbl(CPUPPCState *env)
+{
+    return (target_ulong)cpu_ppc_load_tbl(env);
+}
+
+target_ulong helper_load_tbu(CPUPPCState *env)
+{
+    return cpu_ppc_load_tbu(env);
+}
+
+target_ulong helper_load_atbl(CPUPPCState *env)
+{
+    return (target_ulong)cpu_ppc_load_atbl(env);
+}
+
+target_ulong helper_load_atbu(CPUPPCState *env)
+{
+    return cpu_ppc_load_atbu(env);
+}
+
+target_ulong helper_load_vtb(CPUPPCState *env)
+{
+    return cpu_ppc_load_vtb(env);
+}
+
+#if defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY)
+target_ulong helper_load_purr(CPUPPCState *env)
+{
+    return (target_ulong)cpu_ppc_load_purr(env);
+}
+
+void helper_store_purr(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc_store_purr(env, val);
+}
+#endif
+
+target_ulong helper_load_601_rtcl(CPUPPCState *env)
+{
+    return cpu_ppc601_load_rtcl(env);
+}
+
+target_ulong helper_load_601_rtcu(CPUPPCState *env)
+{
+    return cpu_ppc601_load_rtcu(env);
+}
+
+#if !defined(CONFIG_USER_ONLY)
+void helper_store_tbl(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc_store_tbl(env, val);
+}
+
+void helper_store_tbu(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc_store_tbu(env, val);
+}
+
+void helper_store_atbl(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc_store_atbl(env, val);
+}
+
+void helper_store_atbu(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc_store_atbu(env, val);
+}
+
+void helper_store_601_rtcl(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc601_store_rtcl(env, val);
+}
+
+void helper_store_601_rtcu(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc601_store_rtcu(env, val);
+}
+
+target_ulong helper_load_decr(CPUPPCState *env)
+{
+    return cpu_ppc_load_decr(env);
+}
+
+void helper_store_decr(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc_store_decr(env, val);
+}
+
+target_ulong helper_load_hdecr(CPUPPCState *env)
+{
+    return cpu_ppc_load_hdecr(env);
+}
+
+void helper_store_hdecr(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc_store_hdecr(env, val);
+}
+
+void helper_store_vtb(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc_store_vtb(env, val);
+}
+
+void helper_store_tbu40(CPUPPCState *env, target_ulong val)
+{
+    cpu_ppc_store_tbu40(env, val);
+}
+
+target_ulong helper_load_40x_pit(CPUPPCState *env)
+{
+    return load_40x_pit(env);
+}
+
+void helper_store_40x_pit(CPUPPCState *env, target_ulong val)
+{
+    store_40x_pit(env, val);
+}
+
+void helper_store_booke_tcr(CPUPPCState *env, target_ulong val)
+{
+    store_booke_tcr(env, val);
+}
+
+void helper_store_booke_tsr(CPUPPCState *env, target_ulong val)
+{
+    store_booke_tsr(env, val);
+}
+#endif
+
+/*****************************************************************************/
+/* Embedded PowerPC specific helpers */
+
+/* XXX: to be improved to check access rights when in user-mode */
+target_ulong helper_load_dcr(CPUPPCState *env, target_ulong dcrn)
+{
+    uint32_t val = 0;
+
+    if (unlikely(env->dcr_env == NULL)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "No DCR environment\n");
+        raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
+                               POWERPC_EXCP_INVAL |
+                               POWERPC_EXCP_INVAL_INVAL, GETPC());
+    } else {
+        int ret;
+
+        qemu_mutex_lock_iothread();
+        ret = ppc_dcr_read(env->dcr_env, (uint32_t)dcrn, &val);
+        qemu_mutex_unlock_iothread();
+        if (unlikely(ret != 0)) {
+            qemu_log_mask(LOG_GUEST_ERROR, "DCR read error %d %03x\n",
+                          (uint32_t)dcrn, (uint32_t)dcrn);
+            raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
+                                   POWERPC_EXCP_INVAL |
+                                   POWERPC_EXCP_PRIV_REG, GETPC());
+        }
+    }
+    return val;
+}
+
+void helper_store_dcr(CPUPPCState *env, target_ulong dcrn, target_ulong val)
+{
+    if (unlikely(env->dcr_env == NULL)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "No DCR environment\n");
+        raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
+                               POWERPC_EXCP_INVAL |
+                               POWERPC_EXCP_INVAL_INVAL, GETPC());
+    } else {
+        int ret;
+        qemu_mutex_lock_iothread();
+        ret = ppc_dcr_write(env->dcr_env, (uint32_t)dcrn, (uint32_t)val);
+        qemu_mutex_unlock_iothread();
+        if (unlikely(ret != 0)) {
+            qemu_log_mask(LOG_GUEST_ERROR, "DCR write error %d %03x\n",
+                          (uint32_t)dcrn, (uint32_t)dcrn);
+            raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
+                                   POWERPC_EXCP_INVAL |
+                                   POWERPC_EXCP_PRIV_REG, GETPC());
+        }
+    }
+}