From c693f5e958d92adb72c054921eb1e531c54557c7 Mon Sep 17 00:00:00 2001
From: Marcus Brinkmann <marcus@gnu.org>
Date: Sun, 17 Mar 2002 18:04:49 +0000
Subject: Initial check in of some code under development.

---
 console/display.h | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 console/display.h

(limited to 'console/display.h')

diff --git a/console/display.h b/console/display.h
new file mode 100644
index 00000000..803d3180
--- /dev/null
+++ b/console/display.h
@@ -0,0 +1,79 @@
+/* display.h - The interface to a display driver.
+   Copyright (C) 2002 Free Software Foundation, Inc.
+   Written by Marcus Brinkmann.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd 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
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+#ifndef _DISPLAY_H_
+#define _DISPLAY_H_ 1
+
+#include <errno.h>
+#include <argp.h>
+#include <sys/ioctl.h>
+
+
+struct display_ops
+{
+  /* Initialize the subsystem.  */
+  error_t (*init) (void);
+  
+  /* Create a new (virtual) console display, with the system encoding
+     being ENCODING.  A failure at the first time this is called is
+     critical.  Subsequent calls might return an error if multiple
+     virtual consoles are not supported.  Further operations on this
+     console will be called with the first parameter being *HOOK,
+     which should be set to some unique identifier for this
+     console.  */
+  error_t (*create) (void **console, const char *encoding);
+
+  /* Destroy the console CONSOLE.  The caller will first activate a
+     different console as the active one.  */
+  void (*destroy) (void *console);
+
+  /* Change the active console of WHO to CONSOLE.  WHO is a unique identifier
+   for the entity requesting the activation (which can be used by the
+   display driver to group several activation requests together).  */
+  void (*activate) (void *console, int who);
+
+  /* Scroll the console CONSOLE by the desired amount.  This is only a
+     hint, the actual amount scrolled might depend on the capability
+     of the subsystem.  Negative AMOUNT scrolls back in history.  */
+  error_t (*scroll) (void *console, int amount);
+
+  /* Output LENGTH bytes starting from BUFFER in the system encoding.
+     Set BUFFER and LENGTH to the new values.  The exact semantics are
+     just as in the iconv interface.  */
+  error_t (*output) (void *console, char **buffer, size_t *length);
+
+  /* Return the current size of CONSOLE in WINSIZE.  */
+  void (*getsize) (void *console, struct winsize *size);
+};
+typedef struct display_ops *display_ops_t;
+
+extern struct display_ops vga_display_ops;
+extern struct display_ops mach_display_ops;
+
+display_ops_t display_driver[] =
+  {
+#if defined(__i386__)
+    &vga_display_ops,
+#endif
+    &mach_display_ops,
+    0
+  };
+
+#endif	/* _DISPLAY_H_ */
-- 
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