From fee03799b95240471d9007e4ccd2d6aad73c6450 Mon Sep 17 00:00:00 2001
From: Miguel de Icaza <miguel@nuclecu.unam.mx>
Date: Wed, 16 Jul 1997 02:50:37 +0000
Subject: 	o Implement /dev/graphics virtualizable access to 	 
 registers.  The actual context switch code is not 	  yet there.  But the
 rest of the magic (mapping/unmapping 	  the registers on demand is already
 in).

	o Interface for allowing binary-only console modules added.

	o My RRM bits, nothing really interesting now.

For now, I am assuming in the code that there will be a minor per
real graphics device, and that the X server will go and open
/dev/graphicsN instead of opening /dev/graphics and using the
gfx_attach_board->board variable.

The interface the X server uses is not clear.

I believe it will be pretty easy to provide the stripped down
shmiq interface.  Not only that, but we can even provide the
same ABI (yes, ABI) for SGI shmiq input modules (yep, looks
pretty easy once you have an strace that shows this information).

Now, the only thing missing is figuring what is wrong my current
conception of the use of shmiq.  I just can't get it.
---
 drivers/sgi/char/sgicons.c | 39 +++++++++++++++++++++++++++++----------
 1 file changed, 29 insertions(+), 10 deletions(-)

(limited to 'drivers/sgi/char/sgicons.c')

diff --git a/drivers/sgi/char/sgicons.c b/drivers/sgi/char/sgicons.c
index 7f8882cda..daf1b8fce 100644
--- a/drivers/sgi/char/sgicons.c
+++ b/drivers/sgi/char/sgicons.c
@@ -17,60 +17,79 @@
 #include "gconsole.h"
 
 /* This is the system graphics console (the first adapter found) */
-struct console_ops gconsole;
+struct console_ops *gconsole = 0;
+
+void
+register_gconsole (struct console_ops *gc)
+{
+	if (gconsole)
+		return;
+	gconsole = gc;
+}
 
 void
 __set_origin (unsigned short offset)
 {
-	(*gconsole.set_origin)(offset);
+	if (gconsole)
+		(*gconsole->set_origin)(offset);
 }
 
 void
 hide_cursor (void)
 {
-	(*gconsole.hide_cursor)();
+
+	if (gconsole)
+		(*gconsole->hide_cursor)();
 }
 
 void
 set_cursor (int currcons)
 {
-	(*gconsole.set_cursor)(currcons);
+	if (gconsole)
+		(*gconsole->set_cursor)(currcons);
 }
 
 void
 get_scrmem (int currcons)
 {
-	(*gconsole.get_scrmem)(currcons);
+	if (gconsole)
+		(*gconsole->get_scrmem)(currcons);
 }
 
 void
 set_scrmem (int currcons, long offset)
 {
-	(*gconsole.set_scrmem)(currcons, offset);
+	if (gconsole)
+		(*gconsole->set_scrmem)(currcons, offset);
 }
 
 int
 set_get_cmap (unsigned char *arg, int set)
 {
-	return (*gconsole.set_get_cmap)(arg, set);
+	if (gconsole)
+		return (*gconsole->set_get_cmap)(arg, set);
+	return 0;
 }
 
 void
 blitc (unsigned short charattr, unsigned long addr)
 {
-	(*gconsole.blitc)(charattr, addr);
+	if (gconsole)
+		(*gconsole->blitc)(charattr, addr);
 }
 
 void
 memsetw (void *s, unsigned short c, unsigned int count)
 {
-	(*gconsole.memsetw)(s, c, count);
+	if (gconsole)
+		(*gconsole->memsetw)(s, c, count);
 }
 
 void
 memcpyw (unsigned short *to, unsigned short *from, unsigned int count)
 {
-	(*gconsole.memcpyw)(to, from, count);
+	if (gconsole)
+		(*gconsole->memcpyw)(to, from, count);
 }
 
 int
-- 
cgit v1.2.3