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, 67 insertions, 0 deletions

diff --git a/chardev/chardev-internal.h b/chardev/chardev-internal.h
new file mode 100644
index 000000000..aba024075
--- /dev/null
+++ b/chardev/chardev-internal.h
@@ -0,0 +1,67 @@
+/*
+ * QEMU Character device internals
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef CHARDEV_INTERNAL_H
+#define CHARDEV_INTERNAL_H
+
+#include "chardev/char.h"
+#include "chardev/char-fe.h"
+#include "qom/object.h"
+
+#define MAX_MUX 4
+#define MUX_BUFFER_SIZE 32 /* Must be a power of 2.  */
+#define MUX_BUFFER_MASK (MUX_BUFFER_SIZE - 1)
+
+struct MuxChardev {
+    Chardev parent;
+    CharBackend *backends[MAX_MUX];
+    CharBackend chr;
+    int focus;
+    int mux_cnt;
+    int term_got_escape;
+    int max_size;
+    /* Intermediate input buffer catches escape sequences even if the
+       currently active device is not accepting any input - but only until it
+       is full as well. */
+    unsigned char buffer[MAX_MUX][MUX_BUFFER_SIZE];
+    int prod[MAX_MUX];
+    int cons[MAX_MUX];
+    int timestamps;
+
+    /* Protected by the Chardev chr_write_lock.  */
+    int linestart;
+    int64_t timestamps_start;
+};
+typedef struct MuxChardev MuxChardev;
+
+DECLARE_INSTANCE_CHECKER(MuxChardev, MUX_CHARDEV,
+                         TYPE_CHARDEV_MUX)
+#define CHARDEV_IS_MUX(chr)                             \
+    object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_MUX)
+
+void mux_set_focus(Chardev *chr, int focus);
+void mux_chr_send_all_event(Chardev *chr, QEMUChrEvent event);
+
+Object *get_chardevs_root(void);
+
+#endif /* CHAR_MUX_H */