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, 31 insertions, 0 deletions

diff --git a/include/hw/display/vga.h b/include/hw/display/vga.h
new file mode 100644
index 000000000..5f7825e0e
--- /dev/null
+++ b/include/hw/display/vga.h
@@ -0,0 +1,31 @@
+/*
+ * QEMU VGA Emulator.
+ *
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#ifndef QEMU_HW_DISPLAY_VGA_H
+#define QEMU_HW_DISPLAY_VGA_H
+
+#include "exec/hwaddr.h"
+
+/*
+ * modules can reference this symbol to avoid being loaded
+ * into system emulators without vga support
+ */
+extern bool have_vga;
+
+enum vga_retrace_method {
+    VGA_RETRACE_DUMB,
+    VGA_RETRACE_PRECISE
+};
+
+extern enum vga_retrace_method vga_retrace_method;
+
+int isa_vga_mm_init(hwaddr vram_base,
+                    hwaddr ctrl_base, int it_shift,
+                    MemoryRegion *address_space);
+
+#endif