Add the ability to set kbmap=value via plan9.ini

[Aaron Bieber <aaron@bolddaemon.com>]

Hi,

This lets one specify they desired kbmap via plan9.ini. Makes typing
boot parameters much easier!

Cheers,
Aaron

diff -r 484d3f8e5978 sys/man/8/plan9.ini
--- a/sys/man/8/plan9.ini	Tue Sep 29 07:28:47 2020 -0700
+++ b/sys/man/8/plan9.ini	Tue Sep 29 18:17:18 2020 -0600
@@ -571,10 +571,22 @@
 The line
 .B serial=type=com
 can be used to specify settings for a PCMCIA modem.
+.SS \fLkbmap=\fIvalue\fP
+This specifies the keyboard map to use.
+.I Value
+can be a map file found in
+.B /sys/lib/kbmap
+on the ramdisk.
+.PP
+For example:
+.TP
+.B kbmap=colemak
 .SS \fLmouseport=\fIvalue\fP
 This specifies where the mouse is attached.
 .I Value
-can be
+can be a map file found in
+.B /sys/lib/kbmap
+on the ramdisk.
 .TP
 .B ps2
 the PS2 mouse/keyboard port.  The BIOS setup procedure
diff -r 484d3f8e5978 sys/src/9/boot/bootfs.proto
--- a/sys/src/9/boot/bootfs.proto	Tue Sep 29 07:28:47 2020 -0700
+++ b/sys/src/9/boot/bootfs.proto	Tue Sep 29 18:17:18 2020 -0600
@@ -58,6 +58,10 @@
 		nusbrc 555 sys sys ../boot/nusbrc
 		bootrc 555 sys sys ../boot/bootrc
 tmp
+sys
+	lib
+		kbmap
+			+
 lib
 	firmware
 		+
diff -r 484d3f8e5978 sys/src/9/boot/bootrc
--- a/sys/src/9/boot/bootrc	Tue Sep 29 07:28:47 2020 -0700
+++ b/sys/src/9/boot/bootrc	Tue Sep 29 18:17:18 2020 -0600
@@ -67,6 +67,12 @@
 fn main{
 	mp=()
 	while(~ $#mp 0){
+		if(! ~$#kbmap 0){
+			if(test -f /sys/lib/kbmap/$kbmap){
+				echo 'setting kbmap to' $kbmap
+				cat /sys/lib/kbmap/$kbmap >/dev/kbmap
+			}
+		}
 		if(~ $#nobootprompt 0){
 			echo
 			showlocaldevs