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add msr.c

--- a/README.md

+++ b/README.md

@@ -4,3 +4,4 @@

 Just copy and use for whatever you want.

 * `qt.[ch]` [QP tries](https://dotat.at/prog/qp/README.html)

+* `msr.c` MSR reading tool

--- /dev/null

+++ b/msr.c

@@ -1,0 +1,32 @@

+#include <u.h>

+#include <libc.h>

+

+static void

+usage(void)

+{

+	fprint(2, "%s REGISTER\n", argv0);

+	exits("usage");

+}

+

+void

+main(int argc, char **argv)

+{

+	uvlong x, off;

+	int f;

+

+	ARGBEGIN{

+	}ARGEND

+

+	if(argc < 1)

+		usage();

+

+	if((f = open("/dev/msr", OREAD)) < 0)

+		sysfatal("%r");

+	off = strtoull(argv[0], nil, 0);

+	if(pread(f, &x, 8, off) != 8)

+		sysfatal("%r");

+	close(f);

+	print("%#llux\n", x);

+

+	exits(nil);

+}