hw/display/vga: extract public API from i386/pc to "hw/display/vga.h"

and remove the old i386/pc dependency.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

include/hw/display/vga.h

@@ -0,0 +1,25 @@
+/*
+ * 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/memory.h"
+
+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