Add pages for esc1+shift and esc1+ctrl - some UK USB keyboards (Dell) and it seems some
German ones: https://groups.google.com/forum/#!topic/comp.os.plan9/ycok6NTCWCg seem to
generate an esc1 + code scancode combination for the pipe/backslash key. Seems like
overkill to add two whole pages for just two keys, but there again RAM is cheap these days.

Probably should take the changes across to omap/kbd.c (and by extension bcm/kbd.c)
but the changes are trivial.

Notes:
Mon Mar 17 16:52:57 EDT 2014 geoff
    obsoleted by later patch omap_pi-kbmap, I hope.


Reference: /n/sources/patch/sorry/kbmap-uk-weird
Date: Thu Nov  7 16:06:32 CET 2013
Signed-off-by: steve@quintile.net
Reviewed-by: geoff

--- /sys/lib/kbmap/uk	Thu Nov  7 16:01:31 2013
+++ /sys/lib/kbmap/uk	Thu Nov  7 16:01:23 2013
@@ -6,3 +6,7 @@
 0	86	'\
 4	86	^\
 1	86	'|
+
+2	86	'\
+5	86	^\
+6	86	'|
--- /sys/src/9/pc/kbd.c	Thu Nov  7 16:01:50 2013
+++ /sys/src/9/pc/kbd.c	Thu Nov  7 16:01:39 2013
@@ -123,6 +123,46 @@
 [0x78]	No,	Up,	No,	No,	No,	No,	No,	No,
 };
 
+Rune kbtabshiftesc1[Nscan] =
+{
+[0x00]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x08]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x10]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x18]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x20]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x28]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x30]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x38]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x40]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x48]	Up,	No,	No,	No,	No,	No,	No,	No,
+[0x50]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x58]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x60]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x68]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x70]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x78]	No,	Up,	No,	No,	No,	No,	No,	No,
+};
+
+Rune kbtabctrlesc1[Nscan] =
+{
+[0x00]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x08]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x10]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x18]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x20]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x28]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x30]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x38]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x40]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x48]	Up,	No,	No,	No,	No,	No,	No,	No,
+[0x50]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x58]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x60]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x68]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x70]	No,	No,	No,	No,	No,	No,	No,	No,
+[0x78]	No,	Up,	No,	No,	No,	No,	No,	No,
+};
+
 Rune kbtabaltgr[Nscan] =
 {
 [0x00]	No,	No,	No,	No,	No,	No,	No,	No,
@@ -412,7 +452,13 @@
 		return;
 	}
 
-	if(kbscan->esc1){
+	if(kbscan->esc1 && kbscan->ctl){
+		c = kbtabctrlesc1[c];
+		kbscan->esc1 = 0;
+	} else if(kbscan->esc1 && kbscan->shift){
+		c = kbtabshiftesc1[c];
+		kbscan->esc1 = 0;
+	} else if(kbscan->esc1){
 		c = kbtabesc1[c];
 		kbscan->esc1 = 0;
 	} else if(kbscan->esc2){
@@ -709,6 +755,12 @@
 	case 4:	
 		kbtabctrl[scanc] = r;
 		break;
+	case 5:	
+		kbtabctrlesc1[scanc] = r;
+		break;
+	case 6:	
+		kbtabshiftesc1[scanc] = r;
+		break;
 	}
 }
 
@@ -736,6 +788,12 @@
 		return 1;
 	case 4:
 		*r = kbtabctrl[*sc];
+		return 1;
+	case 5:
+		*r = kbtabctrlesc1[*sc];
+		return 1;
+	case 6:
+		*r = kbtabshiftesc1[*sc];
 		return 1;
 	}
 }