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io: add -E flag to access embedded controller space

--- a/sys/man/1/io

+++ b/sys/man/1/io

@@ -4,7 +4,7 @@

 .SH SYNOPSIS

 .B io

 [

-.B -WLMrw

+.B -WLMErw

 ]

 .I address

 [

@@ -38,7 +38,11 @@

 .TP

 .B  -M

 Access a 64 bit wide machine specific register (MSR).

+.TP

+.B  -E

+Access embedded controller space.

 .SH SOURCE

 .B /sys/src/cmd/io.c

 .SH SEE ALSO

-.IR seg (1)

+.IR seg (1),

+.IR arch (3)

--- a/sys/src/cmd/io.c

+++ b/sys/src/cmd/io.c

@@ -1,7 +1,7 @@

 #include <u.h>

 #include <libc.h>

-const char const * datac[] = {0,"#P/iob","#P/iow",0,"#P/iol",0,0,0,"#P/msr"};

+char *datac[] = {0,"#P/iob","#P/iow",0,"#P/iol",0,0,0,"#P/msr"};

 void

 main(int argc, char** argv) {

@@ -17,6 +17,7 @@

 		case 'W': size = 2; break;

 		case 'L': size = 4; break;

 		case 'M': size = 8; break;

+		case 'E': datac[1] = datac[2] = datac[4] = datac[8] = "#P/ec"; break;

 		case 'r': op = OREAD; break;

 		case 'w': op = OWRITE; break;

 		default: sysfatal("bad flag %c", ARGC());