patch-1.3.59 linux/drivers/char/selection.h

• Lines: 26
• Date: Wed Jan 24 00:21:21 1996
• Orig file: v1.3.58/linux/drivers/char/selection.h
• Orig date: Wed Nov 8 07:11:31 1995

diff -u --recursive --new-file v1.3.58/linux/drivers/char/selection.h linux/drivers/char/selection.h
@@ -77,12 +77,9 @@
  * of the VC's backing store, or the "shadow screen" memory where the screen
  * contents are kept, as the TGA frame buffer is *not* char/attr cells.
  *
- * The "(unsigned long) addr < video_mem_term" tests for an Alpha kernel
- *  virtual address less than the end of the "shadow scrren" memory. This
- *  indicates we really want to write to the screen, so, we do... :-)
- *
- * NOTE: we must guarantee that video_mem_term is less than *any* VC's backing
- * store; to do that, we must allocate it earlier than any VC's are done.
+ * We must test for an Alpha kernel virtual address that falls within
+ *  the "shadow screen" memory. This condition indicates we really want 
+ *  to write to the screen, so, we do... :-)
  *
  * NOTE also: there's only *TWO* operations: to put/get a character/attribute.
  *  All the others needed by VGA support go away, as Not Applicable for TGA.
@@ -94,7 +91,8 @@
 	 * if so, then render the char/attr onto the real screen.
         */
         *addr = val;
-        if ((unsigned long)addr < video_mem_term) {
+        if ((unsigned long)addr < video_mem_term &&
+	    (unsigned long)addr >= video_mem_base) {
                 tga_blitc(val, (unsigned long) addr);
         }
 }