Make the blank screen saver work with MDA and CGA. The fade and green

savers are also modified so that they behave in the same way as the
blank saver on MDA and CGA, although it's not the way these screen
savers are supposed to work, but fading monitor and tickling green
monitor cannot be done on MDA and CGA, AFAIK.  So, this is the second
best solution.

As of this change, the current state of support of screen savers is
summarized in the following table.

		MDA	CGA	EGA	VGA
blank		OK	OK	NA	OK
daemon		OK	OK	OK	OK
fade		*	*	NA	OK
green		*	*	NA	OK
snake		OK	OK	OK	OK
star		OK	OK	OK	OK

OK: works
NA: doesn't work, the module cannot be loaded for this adapter.
*: behave the same way as the blank saver.

As you can see, EGA is left out for now. But, we can do no better, as
EGA registers cannot be read...

Reviewed by: sos

1 files changed, 48 insertions, 7 deletions

diff --git a/sys/dev/syscons/blank/blank_saver.c b/sys/dev/syscons/blank/blank_saver.c
index a534ab3..451dc9a 100644
--- a/sys/dev/syscons/blank/blank_saver.c
+++ b/sys/dev/syscons/blank/blank_saver.c
@@ -25,7 +25,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *	$Id: blank_saver.c,v 1.9 1997/04/06 10:48:10 dufault Exp $
+ *	$Id: blank_saver.c,v 1.10 1997/07/15 14:49:09 yokota Exp $
  */
 
 #include <sys/param.h>
@@ -46,12 +46,44 @@ blank_saver(int blank)
 	u_char val;
 	if (blank) {
 		scrn_blanked = 1;
-		outb(TSIDX, 0x01); val = inb(TSREG);
-		outb(TSIDX, 0x01); outb(TSREG, val | 0x20);
+		switch (crtc_type) {
+		case KD_VGA:
+			outb(TSIDX, 0x01); val = inb(TSREG);
+			outb(TSIDX, 0x01); outb(TSREG, val | 0x20);
+			break;
+		case KD_EGA:
+			/* not yet done XXX */
+			break;
+		case KD_CGA:
+			outb(crtc_addr + 4, 0x25);
+			break;
+		case KD_MONO:
+		case KD_HERCULES:
+			outb(crtc_addr + 4, 0x21);
+			break;
+		default:
+			break;
+		}
 	}
 	else {
-		outb(TSIDX, 0x01); val = inb(TSREG);
-		outb(TSIDX, 0x01); outb(TSREG, val & 0xDF);
+		switch (crtc_type) {
+		case KD_VGA:
+			outb(TSIDX, 0x01); val = inb(TSREG);
+			outb(TSIDX, 0x01); outb(TSREG, val & 0xDF);
+			break;
+		case KD_EGA:
+			/* not yet done XXX */
+			break;
+		case KD_CGA:
+			outb(crtc_addr + 4, 0x2d);
+			break;
+		case KD_MONO:
+		case KD_HERCULES:
+			outb(crtc_addr + 4, 0x29);
+			break;
+		default:
+			break;
+		}
 		scrn_blanked = 0;
 	}
 }
@@ -59,8 +91,17 @@ blank_saver(int blank)
 static int
 blank_saver_load(struct lkm_table *lkmtp, int cmd)
 {
-	if (!crtc_vga)
-		return EINVAL;
+	switch (crtc_type) {
+	case KD_MONO:
+	case KD_HERCULES:
+	case KD_CGA:
+	case KD_VGA:
+		break;
+	case KD_EGA:
+		/* EGA is yet to be supported */
+	default:
+		return ENODEV;
+	}
 	return add_scrn_saver(blank_saver);
 }