msrtool: Release Candidate 1

msrtool can decode MSRs and print the value of every field in human
readable form. It can also be used to save a set of MSRs to a file,
and at a later time compare the saved values with current values in
hardware.

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3766 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

11 files changed, 1719 insertions, 0 deletions

diff --git a/util/msrtool/COPYING b/util/msrtool/COPYING
new file mode 100644
index 0000000000..d511905c16
--- /dev/null
+++ b/util/msrtool/COPYING
@@ -0,0 +1,339 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
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+Foundation's software and to any other program whose authors commit to
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+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/util/msrtool/Makefile.in b/util/msrtool/Makefile.in
new file mode 100644
index 0000000000..4972a25f0a
--- /dev/null
+++ b/util/msrtool/Makefile.in
@@ -0,0 +1,66 @@
+# Makefile for msrtool
+#
+# This file is part of msrtool.
+#
+# Copyright (c) 2008 Peter Stuge <peter@stuge.se>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+#
+
+PROGRAM = msrtool
+
+CC      = @CC@
+INSTALL = @INSTALL@
+PREFIX  = @PREFIX@
+CFLAGS  = @CFLAGS@
+LDFLAGS = @LDFLAGS@
+
+TARGETS = geodelx.o cs5536.o
+SYSTEMS = linux.o
+OBJS    = $(PROGRAM).o msrutils.o sys.o $(SYSTEMS) $(TARGETS)
+
+all: $(PROGRAM)
+
+$(PROGRAM): $(OBJS) Makefile.deps
+	$(CC) -o $@ $(OBJS) $(LDFLAGS)
+
+$(PROGRAM).o: $(PROGRAM).c
+	$(CC) $(CFLAGS) -DVERSION='"@VERSION@"' -c $< -o $@
+
+install: $(PROGRAM)
+	$(INSTALL) $(PROGRAM) $(PREFIX)/sbin
+	mkdir -p $(PREFIX)/share/man/man8
+	$(INSTALL) $(PROGRAM).8 $(PREFIX)/share/man/man8
+
+distprep: distclean Makefile.deps
+
+clean:
+	rm -f $(PROGRAM) $(OBJS)
+
+distclean: clean
+	rm -f Makefile
+
+mrproper: distclean
+	rm -f Makefile.deps
+
+dep:
+	rm -f Makefile.deps
+	$(MAKE) Makefile.deps
+
+Makefile.deps: $(patsubst %.o,%.c,$(OBJS))
+	$(CC) -MM $^ > $@
+
+.PHONY: all distprep clean distclean mrproper dep
+
+-include Makefile.deps
diff --git a/util/msrtool/TODO b/util/msrtool/TODO
new file mode 100644
index 0000000000..c701e72896
--- /dev/null
+++ b/util/msrtool/TODO
@@ -0,0 +1,8 @@
+Systems
+-------
+FreeBSD #defines: see svn diff -r 3697:3698 util/
+
+Other ideas
+-----------
+Move MSR definitions and probe instructions into an external text file?
+Handle PCI registers as well?
diff --git a/util/msrtool/configure b/util/msrtool/configure
new file mode 100755
index 0000000000..f627a6541f
--- /dev/null
+++ b/util/msrtool/configure
@@ -0,0 +1,162 @@
+#!/bin/sh
+#
+# This file is part of msrtool.
+#
+# Copyright (c) 2008 Peter Stuge <peter@stuge.se>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+#
+
+# If this is left unset, try to set the version string from the highest
+# revision number of the checked out files later.
+VERSION=""
+
+REV="$(svnversion -c . 2>/dev/null)"; REV="${REV/*:}"
+VERSION="${VERSION:-$REV}"
+
+function findprog() {
+	local WHAT FROMENV FILE
+	WHAT="${1}"
+	shift
+	FROMENV="${1}"
+	shift
+	echo -n "searching for ${WHAT} (${*})..." 1>&2
+	test -n "${FROMENV}" && {
+		echo "  using environment: ${FROMENV}" 1>&2
+		echo "${FROMENV}"
+		exit 0
+	}
+	for parm in $(seq 0 $#); do
+		test -z "${1}" && {
+			shift
+			continue
+		}
+		FILE="$(which "${1}" 2>/dev/null)"
+		test $? -eq 0 && {
+			echo "${1}"
+			break
+		}
+		shift
+	done
+	test -z "${1}" && {
+		echo "  not found!" 1>&2
+		echo 1>&2
+		echo "This is a fatal error, configure is exiting!" 1>&2
+		exit 1
+	}
+	echo "  using ${FILE} in PATH" 1>&2
+	exit 0
+}
+
+function trycompile() {
+	local WHAT OUT
+	WHAT="${1}"
+	shift
+	echo -n "finding CFLAGS for ${WHAT}... " 1>&2
+	OUT="${OUT}\n${CC} ${CFLAGS} -o .config.o -c .config.c"
+	OUT="${OUT}\n$(${CC} ${CFLAGS} -o .config.o -c .config.c 2>&1)"
+	test $? -eq 0 && {
+		echo " using: ${CFLAGS}" 1>&2
+		echo "${CFLAGS}"
+		exit 0
+	}
+	for parm in $(seq 1 $#); do
+		OUT="${OUT}\n${CC} ${CFLAGS} ${1} -o .config.o -c .config.c 2>&1"
+		OUT="${OUT}\n$(${CC} ${CFLAGS} ${1} -o .config.o -c .config.c 2>&1)"
+		test $? -eq 0 && {
+			echo " using: ${CFLAGS} ${1}" 1>&2
+			echo "${CFLAGS} ${1}"
+			exit 0
+		} 
+		shift
+	done
+	echo "failed!" 1>&2
+	echo 1>&2
+	echo -n "The following compiler commands were executed:" 1>&2
+	echo -e "${OUT}\n" 1>&2
+	echo "This is a fatal error, configure is exiting!" 1>&2
+	echo 1>&2
+	echo "You can try to fix this by manually setting CFLAGS in the environment before" 1>&2
+	echo "running configure. E.g.:" 1>&2
+	echo "CFLAGS=-I/opt/somedir/include ${0}" 1>&2
+	echo 1>&2
+	exit 1
+}
+
+function trylink() {
+	local WHAT OUT
+	WHAT="${1}"
+	shift
+	echo -n "finding LDFLAGS for ${WHAT}... " 1>&2
+	OUT="${OUT}\n${CC} -o .config .config.o ${LDFLAGS} 2>&1"
+	OUT="${OUT}\n$(${CC} -o .config .config.o ${LDFLAGS} 2>&1)"
+	test $? -eq 0 && {
+		echo " using: ${LDFLAGS}" 1>&2
+		echo "${LDFLAGS}"
+		exit 0
+	}
+	for parm in $(seq 1 $#); do
+		OUT="${OUT}\n${CC} -o .config .config.o ${LDFLAGS} ${1} 2>&1"
+		OUT="${OUT}\n$(${CC} -o .config .config.o ${LDFLAGS} ${1} 2>&1)"
+		test $? -eq 0 && {
+			echo " using: ${LDFLAGS} ${1}" 1>&2
+			echo "${LDFLAGS} ${1}"
+			exit 0
+		}
+		shift
+	done
+	echo "failed!" 1>&2
+	echo 1>&2
+	echo -n "The following linker commands were executed:" 1>&2
+	echo -e "${OUT}\n" 1>&2
+	echo "This is a fatal error, configure is exiting!" 1>&2
+	echo 1>&2
+	echo "You can try to fix this by manually setting LDFLAGS in the environment before" 1>&2
+	echo "running configure. E.g.:" 1>&2
+	echo "LDFLAGS=-L/opt/somedir/lib ${0}" 1>&2
+	echo 1>&2
+	exit 1
+}
+
+CC=$(findprog "compiler" "${CC}" gcc cc icc) || exit
+INSTALL=$(findprog "install" "${INSTALL}" install ginstall) || exit
+
+test -n "$DEBUG" && myCFLAGS="-O2 -g" || myCFLAGS="-Os"
+CFLAGS="${CFLAGS} ${myCFLAGS} -Wall -Werror"
+
+PREFIX="${PREFIX:-/usr/local}"
+
+OS_ARCH=$(uname)
+
+echo
+echo "configured using the following settings:"
+echo
+echo "VERSION=${VERSION}"
+echo "CC=${CC}"
+echo "CFLAGS=${CFLAGS}"
+echo "LDFLAGS=${LDFLAGS}"
+echo "INSTALL=${INSTALL}"
+echo "PREFIX=${PREFIX}"
+echo
+echo -n "creating Makefile..."
+echo "# This file was automatically generated by configure" > Makefile
+sed -e "s#@VERSION@#${VERSION}#g" \
+	-e "s#@CC@#${CC}#g" \
+	-e "s#@CFLAGS@#${CFLAGS}#g" \
+	-e "s#@LDFLAGS@#${LDFLAGS}#g" \
+	-e "s#@INSTALL@#${INSTALL}#g" \
+	-e "s#@PREFIX@#/usr/local#g" \
+	Makefile.in >> Makefile
+echo "  done"
+echo
diff --git a/util/msrtool/cs5536.c b/util/msrtool/cs5536.c
new file mode 100644
index 0000000000..d441891a3f
--- /dev/null
+++ b/util/msrtool/cs5536.c
@@ -0,0 +1,29 @@
+/*
+ * This file is part of msrtool.
+ *
+ * Copyright (c) 2008 Peter Stuge <peter@stuge.se>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include "msrtool.h"
+
+int cs5536_probe(const struct targetdef *target) {
+	/* TODO: PCI 1022:2090 */
+	return 0;
+}
+
+const struct msrdef cs5536_msrs[] = {
+	{ MSR_EOT }
+};
diff --git a/util/msrtool/geodelx.c b/util/msrtool/geodelx.c
new file mode 100644
index 0000000000..db4f0fc5f2
--- /dev/null
+++ b/util/msrtool/geodelx.c
@@ -0,0 +1,104 @@
+/*
+ * This file is part of msrtool.
+ *
+ * Copyright (c) 2008 Peter Stuge <peter@stuge.se>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include "msrtool.h"
+
+int geodelx_probe(const struct targetdef *target) {
+	struct cpuid_t *id = cpuid();
+	return 10 == id->family && 5 == id->model;
+}
+
+const struct msrdef geodelx_msrs[] = {
+	{ 0x4c00000f, MSRTYPE_RDWR, MSR2(0, 0), "GLCP_DELAY_CONTROLS", "GLCP I/O Delay Controls", {
+		{ 63, 1, "EN", "Enable", PRESENT_DEC, {
+			{ MSR1(0), "Use default values" },
+			{ MSR1(1), "Use value in bits [62:0]" },
+			{ BITVAL_EOT }
+		}},
+		{ 62, 1, "B_DQ", "Buffer Control for DQ DQS DQM TLA drive", PRESENT_DEC, {
+			{ MSR1(1), "Half power" },
+			{ MSR1(0), "Quarter power" },
+			{ BITVAL_EOT }
+		}},
+		{ 61, 1, "B_CMD", "Buffer Control for RAS CAS CKE CS WE drive", PRESENT_DEC, {
+			{ MSR1(1), "Half power" },
+			{ MSR1(0), "Quarter power" },
+			{ BITVAL_EOT }
+		}},
+		{ 60, 1, "B_MA", "Buffer Control for MA BA drive", PRESENT_DEC, {
+			{ MSR1(0), "Half power" },
+			{ MSR1(1), "Full power" },
+			{ BITVAL_EOT }
+		}},
+		{ 59, 1, "SDCLK_SET", "SDCLK Setup", PRESENT_DEC, {
+			{ MSR1(0), "Full SDCLK setup" },
+			{ MSR1(1), "Half SDCLK setup for control signals" },
+			{ BITVAL_EOT }
+		}},
+		{ 58, 3, "DDR_RLE", "DDR read latch enable position", PRESENT_DEC, NOBITS },
+		{ 55, 1, "SDCLK_DIS", "SDCLK disable [1,3,5]", PRESENT_DEC, {
+			{ MSR1(0), "All SDCLK output" },
+			{ MSR1(1), "SDCLK[0,2,4] output only" },
+			{ BITVAL_EOT }
+		}},
+		{ 54, 3, "TLA1_OA", "TLA hint pin output adjust", PRESENT_DEC, NOBITS },
+		{ 51, 2, "D_TLA1", "Output delay for TLA1", PRESENT_DEC, NOBITS },
+		{ 49, 2, "D_TLA0", "Output delay for TLA0", PRESENT_DEC, NOBITS },
+		{ 47, 2, "D_DQ_E", "Output delay for DQ DQM - even byte lanes", PRESENT_DEC, NOBITS },
+		{ 45, 2, "D_DQ_O", "Output delay for DQ DQM - odd byte lanes", PRESENT_DEC, NOBITS },
+		{ 43, 2, RESERVED},
+		{ 41, 2, "D_SDCLK", "Output delay for SDCLK", PRESENT_DEC, NOBITS },
+		{ 39, 2, "D_CMD_O", "Output delay for CKE CS RAS CAS WE - odd bits", PRESENT_DEC, NOBITS },
+		{ 37, 2, "D_CMD_E", "Output delay for CKE CS RAS CAS WE - even bits", PRESENT_DEC, NOBITS },
+		{ 35, 2, "D_MA_O", "Output delay for BA MA - odd bits", PRESENT_DEC, NOBITS },
+		{ 33, 2, "D_MA_E", "Output delay for BA MA - even bits", PRESENT_DEC, NOBITS },
+		{ 31, 2, "D_PCI_O", "Output delay for pci_ad IRQ13 SUSPA# INTA# - odd bits", PRESENT_DEC, NOBITS },
+		{ 29, 2, "D_PCI_E", "Output delay for pci_ad IRQ13 SUSPA# INTA# - even bits", PRESENT_DEC, NOBITS },
+		{ 27, 2, "D_DOTCLK", "Output delay for DOTCLK", PRESENT_DEC, NOBITS },
+		{ 25, 2, "D_DRGB_O", "Output delay for DRGB[31:0] - odd bits", PRESENT_DEC, NOBITS },
+		{ 23, 2, "D_DRGB_E", "Output delay for DRGB[31:0] HSYNC VSYNC DISPEN VDDEN LDE_MOD - even bits", PRESENT_DEC, NOBITS },
+		{ 21, 2, "D_PCI_IN", "Input delay for pci_ad CBE# PAR STOP# FRAME# IRDY# TRDY# DEVSEL# REQ# GNT# CIS", PRESENT_DEC, NOBITS },
+		{ 19, 2, "D_TDBGI", "Input delay for TDBGI", PRESENT_DEC, NOBITS },
+		{ 17, 2, "D_VIP", "Input delay for VID[15:0] VIP_HSYNC VIP_VSYNC", PRESENT_DEC, NOBITS },
+		{ 15, 2, "D_VIPCLK", "Input delay for VIPCLK", PRESENT_DEC, NOBITS },
+		{ 13, 1, "H_SDCLK", "Half SDCLK hold select (for cmd addr)", PRESENT_DEC, {
+			{ MSR1(1), "Half SDCLK setup for MA and BA" },
+			{ MSR1(0), "Full SDCLK setup" },
+			{ BITVAL_EOT }
+		}},
+		{ 12, 2, "PLL_FD_DEL", "PLL Feedback Delay", PRESENT_BIN, {
+			{ MSR1(0), "No feedback delay" },
+			{ MSR1(1), "~350 ps" },
+			{ MSR1(2), "~700 ps" },
+			{ MSR1(3), "~1100 ps (Max feedback delay)" },
+			{ BITVAL_EOT }
+		}},
+		{ 10, 5, RESERVED },
+		{ 5, 1, "DLL_OV", "DLL Override (to DLL)", PRESENT_DEC, NOBITS },
+		{ 4, 5, "DLL_OVS/RSDA", "DLL Override Setting or Read Strobe Delay Adjust", PRESENT_DEC, NOBITS },
+		{ BITS_EOT }
+	}},
+/*
+	{ 0, MSRTYPE_RDONLY, MSR2(0, 0), "TEMPLATE", "Template MSR", {
+		{ 63, 64, RESERVED },
+		{ BITS_EOT }
+	}},
+*/
+	{ MSR_EOT }
+};
diff --git a/util/msrtool/linux.c b/util/msrtool/linux.c
new file mode 100644
index 0000000000..efd3087061
--- /dev/null
+++ b/util/msrtool/linux.c
@@ -0,0 +1,88 @@
+/*
+ * This file is part of msrtool.
+ *
+ * Copyright (c) 2008 Peter Stuge <peter@stuge.se>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include "msrtool.h"
+
+static int msr_fd[MAX_CORES] = {-1, -1, -1, -1, -1, -1, -1, -1};
+
+int linux_probe(const struct sysdef *system) {
+	struct stat st;
+	return 0 == stat("/dev/cpu/0/msr", &st);
+}
+
+int linux_open(uint8_t cpu, enum SysModes mode) {
+	int fmode;
+	char fn[32];
+	switch (mode) {
+	case SYS_RDWR:
+		fmode = O_RDWR;
+		break;
+	case SYS_WRONLY:
+		fmode = O_WRONLY;
+		break;
+	case SYS_RDONLY:
+	default:
+		fmode = O_RDONLY;
+		break;
+	}
+	if (cpu >= MAX_CORES) {
+		fprintf(stderr, "%s: only cores 0-%d are supported. requested=%d\n", __func__, MAX_CORES, cpu);
+		return 0;
+	}
+	if (snprintf(fn, sizeof(fn), "/dev/cpu/%d/msr", cpu) == -1) {
+		fprintf(stderr, "%s: snprintf: %s\n", __func__, strerror(errno));
+		return 0;
+	}
+	msr_fd[cpu] = open(fn, fmode);
+	if (-1 == msr_fd[cpu]) {
+		fprintf(stderr, "open(%s): %s\n", fn, strerror(errno));
+		return 0;
+	}
+	return 1;
+}
+
+int linux_close(uint8_t cpu) {
+	int ret;
+	if (cpu >= MAX_CORES) {
+		fprintf(stderr, "%s: only cores 0-%d are supported. requested=%d\n", __func__, MAX_CORES, cpu);
+		return 0;
+	}
+	ret = close(msr_fd[cpu]);
+	msr_fd[cpu] = 0;
+	return 0 == ret;
+}
+
+int linux_rdmsr(uint8_t cpu, uint32_t addr, struct msr *val) {
+	if (lseek(msr_fd[cpu], addr, SEEK_SET) == -1) {
+		SYSERROR(lseek, addr);
+		return 0;
+	}
+	if (read(msr_fd[cpu], val, 8) != 8) {
+		SYSERROR(read, addr);
+		return 0;
+	}
+	return 1;
+}
diff --git a/util/msrtool/msrtool.c b/util/msrtool/msrtool.c
new file mode 100644
index 0000000000..6f0b3a0109
--- /dev/null
+++ b/util/msrtool/msrtool.c
@@ -0,0 +1,399 @@
+/*
+ * This file is part of msrtool.
+ *
+ * Copyright (c) 2008 Peter Stuge <peter@stuge.se>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "msrtool.h"
+
+#define DEFAULT_CPU 0
+static uint8_t cpu = DEFAULT_CPU;
+
+uint8_t targets_found = 0;
+const struct targetdef **targets = NULL;
+const struct sysdef *sys = NULL;
+uint8_t reserved = 0, verbose = 0, quiet = 0;
+
+static struct targetdef alltargets[] = {
+	{ "geodelx", "AMD Geode(tm) LX", geodelx_probe, geodelx_msrs },
+	{ "cs5536", "AMD Geode(tm) CS5536", cs5536_probe, cs5536_msrs },
+	{ TARGET_EOT }
+};
+
+static struct sysdef allsystems[] = {
+	{ "linux", "Linux with /dev/cpu/*/msr", linux_probe, linux_open, linux_close, linux_rdmsr },
+	{ SYSTEM_EOT }
+};
+
+static void syntax(char *argv[]) {
+	printf("syntax: %s [-hvqrkl] [-c cpu] [-m system] [-t target ...]\n", argv[0]);
+	printf("\t [-i addr=hi[:]lo] | [-s file] | [-d [:]file] | addr...\n");
+	printf("  -h\t show this help text\n");
+	printf("  -v\t be verbose\n");
+	printf("  -q\t be quiet (overrides -v)\n");
+	printf("  -r\t include [Reserved] values\n");
+	printf("  -k\t list all known systems and targets\n");
+	printf("  -l\t list MSRs and bit fields for current target(s) (-kl for ALL targets!)\n");
+	printf("  -c\t access MSRs on the specified CPU, default=%d\n", DEFAULT_CPU);
+	printf("  -m\t force a system, e.g: -m linux\n");
+	printf("  -t\t force a target, can be used multiple times, e.g: -t geodelx -t cs5536\n");
+	printf("  -i\t immediate mode\n");
+	printf("\t decode hex addr=hi:lo for the target without reading hw value\n");
+	printf("\t e.g: -i 4c00000f=f2f100ff56960004\n");
+	printf("  -s\t stream mode\n");
+	printf("\t read one MSR address per line and append current hw value to the line\n");
+	printf("\t use the filename - for stdin/stdout\n");
+	printf("\t using -l -s ignores input and will output all MSRs with values\n");
+	printf("  -d\t diff mode\n");
+	printf("\t read one address and value per line and compare with current hw value,\n");
+	printf("\t printing differences to stdout. use the filename - to read from stdin\n");
+	printf("\t use :file or :- to reverse diff, normally hw values are considered new\n");
+	printf("  addr.. direct mode, read and decode values for the given MSR address(es)\n");
+}
+
+static void *add_target(const struct targetdef *t) {
+	void *tmp;
+	tmp = realloc(targets, (targets_found + 2) * sizeof(struct targetdef *));
+	if (NULL == tmp) {
+		perror("realloc");
+		return tmp;
+	}
+	targets = tmp;
+	targets[targets_found++] = t;
+	targets[targets_found] = NULL;
+	return targets;
+}
+
+int do_stream(const char *streamfn, uint8_t ignoreinput) {
+	char tmpfn[20], line[256];
+	uint8_t tn;
+	size_t start, len;
+	int ret = 1;
+	int fdout = -1;
+	FILE *fin = NULL, *fout = NULL;
+	uint32_t addr, linenum;
+	struct msr m = MSR1(0);
+
+	if (0 == strcmp(streamfn, "-")) {
+		fin = stdin;
+		fout = stdout;
+	} else {
+		if (!ignoreinput) {
+			if (NULL == (fin = fopen(streamfn, "r"))) {
+				perror("fopen()");
+				return 1;
+			}
+			if (snprintf(tmpfn, sizeof(tmpfn), "msrtoolXXXXXX") >= sizeof(tmpfn)) {
+				perror("snprintf");
+				return 1;
+			}
+			if (-1 == (fdout = mkstemp(tmpfn))) {
+				perror("mkstemp");
+				return 1;
+			}
+			if (NULL == (fout = fdopen(fdout, "w"))) {
+				perror("fdopen");
+				return 1;
+			}
+		} else {
+			if (NULL == (fout = fopen(streamfn, "w"))) {
+				perror("fopen");
+				return 1;
+			}
+		}
+	}
+
+	if (!sys->open(cpu, SYS_RDONLY))
+		goto done;
+	if (ignoreinput) {
+		for (tn = 0; tn < targets_found; tn++)
+			if (dumpmsrdefsvals(fout, targets[tn], cpu)) {
+				ret = 1;
+				break;
+			}
+	} else {
+		for (linenum = 1; NULL != fgets(line, sizeof(line), fin); ++linenum) {
+			start = (0 == strncmp("0x", line, 2)) ? 2 : 0;
+			if (1 == sscanf(line + start, "%8x", &addr)) {
+				if (!sys->rdmsr(cpu, addr, &m))
+					goto done;
+				fprintf(fout, "0x%08x 0x%08x%08x\n", addr, m.hi, m.lo);
+				continue;
+			}
+			while (1) {
+				fprintf(fout, "%s", line);
+				len = strlen(line);
+				if (NULL != strchr("\r\n", line[len - 1]))
+					break;
+				if (NULL == fgets(line, sizeof(line), fin))
+					goto read_done;
+			}
+		}
+read_done:
+		if (!feof(fin)) {
+			fprintf(stderr, "%s:%d: fgets: %s\n", streamfn, linenum, strerror(errno));
+			goto done;
+		}
+	}
+	ret = 0;
+done:
+	sys->close(cpu);
+	if (strcmp(streamfn, "-")) {
+		if (ret)
+			unlink(tmpfn);
+		else if (!ignoreinput)
+			rename(tmpfn, streamfn);
+	}
+	if (!ignoreinput)
+		fclose(fin);
+	fclose(fout);
+	return ret;
+}
+
+int do_diff(const char *difffn) {
+	char tmpfn[20], line[512];
+	size_t start, len;
+	int ret = 1, tmp;
+	FILE *fin = NULL, *fout = stdout;
+	uint8_t rev = 0;
+	uint32_t addr, linenum;
+	struct msr mf = MSR1(0), mhw = MSR1(0);
+
+	if (':' == difffn[0]) {
+		rev = 1;
+		++difffn;
+	}
+	if (0 == strcmp(difffn, "-"))
+		fin = stdin;
+	else if (NULL == (fin = fopen(difffn, "r"))) {
+		perror("fopen()");
+		return 1;
+	}
+
+	if (!sys->open(cpu, SYS_RDONLY))
+		goto done;
+	for (linenum = 1; NULL != fgets(line, sizeof(line), fin); ++linenum) {
+		start = (0 == strncmp("0x", line, 2)) ? 2 : 0;
+		if (sscanf(line + start, "%8x %n%*x", &addr, &tmp) >= 1) {
+			start += tmp;
+			for (len = strlen(line) - 1; NULL != strchr("\r\n", line[len]); --len)
+				line[len] = 0;
+			if (!str2msr(line + start, &mf)) {
+				fprintf(stderr, "%s:%d: invalid MSR value '%s'\n", difffn, linenum, line + start);
+				continue;
+			}
+			if (!sys->rdmsr(cpu, addr, &mhw))
+				goto done;
+			if (diff_msr(fout, addr, rev ? mhw : mf, rev ? mf : mhw))
+				fprintf(fout, "\n");
+		}
+	}
+	if (!feof(fin))
+		fprintf(stderr, "%s:%d: fgets: %s\n", difffn, linenum, strerror(errno));
+	else
+		ret = 0;
+done:
+	sys->close(cpu);
+	if (strcmp(difffn, "-")) {
+		if (ret)
+			unlink(tmpfn);
+		else
+			rename(tmpfn, difffn);
+		fclose(fin);
+		fclose(fout);
+	}
+	return ret;
+}
+
+int main(int argc, char *argv[]) {
+	char c;
+	int ret = 1;
+	const struct sysdef *s;
+	const struct targetdef *t;
+	uint8_t tn, listmsrs = 0, listknown = 0, input = 0;
+	uint32_t addr = 0;
+	const char *streamfn = NULL, *difffn = NULL;
+	struct msr msrval = MSR2(-1, -1);
+	while ((c = getopt(argc, argv, "hqvrklc:m:t:a:i:s:d:")) != -1)
+		switch (c) {
+		case 'h':
+			syntax(argv);
+			return 0;
+		case 'q':
+			quiet = 1;
+			break;
+		case 'v':
+			++verbose;
+			break;
+		case 'r':
+			reserved = 1;
+			break;
+		case 'k':
+			listknown = 1;
+			break;
+		case 'l':
+			listmsrs = 1;
+			break;
+		case 'c':
+			cpu = atoi(optarg);
+			break;
+		case 'm':
+			for (s = allsystems; !SYSTEM_ISEOT(*s); s++)
+				if (!strcmp(s->name, optarg)) {
+					sys = s;
+					break;
+				}
+			break;
+		case 't':
+			for (t = alltargets; !TARGET_ISEOT(*t); t++)
+				if (!strcmp(t->name, optarg)) {
+					add_target(t);
+					break;
+				}
+			break;
+		case 'i':
+			input = 1;
+			addr = strtoul(optarg, NULL, 16);
+			optarg = strchr(optarg, '=');
+			if (NULL == optarg) {
+				fprintf(stderr, "missing value in -i argument!\n");
+				break;
+			}
+			if (!str2msr(++optarg, &msrval))
+				fprintf(stderr, "invalid value in -i argument!\n");
+			break;
+		case 's':
+			streamfn = optarg;
+			break;
+		case 'd':
+			difffn = optarg;
+			break;
+		default:
+			break;
+		}
+
+	printf_quiet("msrtool %s\n", VERSION);
+
+	if (!sys && !input && !listknown)
+		for (sys = allsystems; !SYSTEM_ISEOT(*sys); sys++) {
+			printf_verbose("Probing for system %s: %s\n", sys->name, sys->prettyname);
+			if (!sys->probe(sys))
+				continue;
+			printf_quiet("Detected system %s: %s\n", sys->name, sys->prettyname);
+			break;
+		}
+
+	if (targets)
+		for (tn = 0; tn < targets_found; tn++)
+			printf_quiet("Forced target %s: %s\n", targets[tn]->name, targets[tn]->prettyname);
+	else 
+		for (t = alltargets; !TARGET_ISEOT(*t); t++) {
+			printf_verbose("Probing for target %s: %s\n", t->name, t->prettyname);
+			if (!t->probe(t))
+				continue;
+			printf_quiet("Detected target %s: %s\n", t->name, t->prettyname);
+			add_target(t);
+		}
+
+	printf_quiet("\n");
+	fflush(stdout);
+
+	if (listknown) {
+		printf("Known systems:\n");
+		for (s = allsystems; s->name; s++)
+			printf("%s: %s\n", s->name, s->prettyname);
+		printf("\nKnown targets:\n");
+		for (t = alltargets; t->name; t++) {
+			if (listmsrs && alltargets != t)
+				printf("\n");
+			printf("%s: %s\n", t->name, t->prettyname);
+			if (listmsrs)
+				dumpmsrdefs(t);
+		}
+		printf("\n");
+		return 0;
+	}
+
+	if (sys && !sys->name) {
+		fprintf(stderr, "Unable to detect the current operating system!\n");
+		fprintf(stderr, "Please send a report or patch to coreboot@coreboot.org. Thanks for your help!\n");
+		fprintf(stderr, "\n");
+	}
+
+	if (!targets_found || !targets) {
+		fprintf(stderr, "Unable to detect a known target; can not decode any MSRs! (Use -t to force)\n");
+		fprintf(stderr, "Please send a report or patch to coreboot@coreboot.org. Thanks for your help!\n");
+		fprintf(stderr, "\n");
+		return 1;
+	}
+
+	if (input) {
+		decodemsr(cpu, addr, msrval);
+		return 0;
+	}
+
+	if (sys && !sys->name)
+		return 1;
+
+	if (listmsrs) {
+		if (streamfn)
+			return do_stream(streamfn, 1);
+		for (tn = 0; tn < targets_found; tn++) {
+			if (tn)
+				printf("\n");
+			dumpmsrdefs(targets[tn]);
+		}
+		printf("\n");
+		return 0;
+	}
+
+	if (streamfn)
+		return do_stream(streamfn, 0);
+
+	if (!sys->open(cpu, SYS_RDONLY))
+		return 1;
+
+	if (difffn) {
+		ret = do_diff(difffn);
+		goto done;
+	}
+
+	if (optind == argc) {
+		syntax(argv);
+		printf("\nNo mode or address(es) specified!\n");
+		goto done;
+	}
+
+	for (; optind < argc; optind++) {
+		addr = strtoul(argv[optind], NULL, 16);
+		if (!sys->rdmsr(cpu, addr, &msrval))
+			break;
+		decodemsr(cpu, addr, msrval);
+	}
+	ret = 0;
+done:
+	sys->close(cpu);
+	return ret;
+}
diff --git a/util/msrtool/msrtool.h b/util/msrtool/msrtool.h
new file mode 100644
index 0000000000..ab7c227d37
--- /dev/null
+++ b/util/msrtool/msrtool.h
@@ -0,0 +1,183 @@
+/*
+ * This file is part of msrtool.
+ *
+ * Copyright (c) 2008 Peter Stuge <peter@stuge.se>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#ifndef MSRTOOL_H
+#define MSRTOOL_H
+
+#include <stdio.h>
+#include <stdint.h>
+
+#define HEXCHARS "0123456789abcdefABCDEF"
+
+enum {
+	MSRTYPE_RDONLY,
+	MSRTYPE_RDWR,
+	MSRTYPE_WRONLY,
+	MSRTYPE_EOT
+} MsrTypes;
+
+enum {
+	PRESENT_RSVD,
+	PRESENT_DEC,
+	PRESENT_BIN,
+	PRESENT_OCT,
+	PRESENT_HEX,
+	PRESENT_HEXDEC
+} PresentTypes;
+
+struct msr {
+	uint32_t hi;
+	uint32_t lo;
+};
+
+struct msrbitvalues {
+	const struct msr value;
+	const char *text;
+};
+
+struct msrbits {
+	const uint8_t start;
+	const uint8_t size;
+	const char *name;
+	const char *desc;
+	const uint8_t present;
+	const struct msrbitvalues bitval[32];
+};
+
+struct msrdef {
+	const uint32_t addr;
+	const uint8_t type;
+	const struct msr resetval;
+	const char *symbol;
+	const char *desc;
+	const struct msrbits bits[65];
+};
+
+#define MSR1(lo) { 0, (lo) }
+#define MSR2(hi,lo) { (hi), (lo) }
+
+#define BITVAL_EOT .text = NULL
+#define BITVAL_ISEOT(bv) (NULL == (bv).text)
+
+#define BITS_EOT .size = 0
+#define BITS_ISEOT(b) (0 == (b).size)
+
+#define MSR_EOT .type = MSRTYPE_EOT
+#define MSR_ISEOT(m) (MSRTYPE_EOT == (m).type)
+
+#define NOBITS {{ BITVAL_EOT }}
+#define RESERVED "RSVD", "Reserved", PRESENT_HEXDEC, NOBITS
+
+#define MAX_CORES 8
+
+struct targetdef {
+	const char *name;
+	const char *prettyname;
+	int (*probe)(const struct targetdef *target);
+	const struct msrdef *msrs;
+};
+
+#define TARGET_EOT .name = NULL
+#define TARGET_ISEOT(t) (NULL == (t).name)
+
+
+enum SysModes {
+	SYS_RDONLY = 0,
+	SYS_WRONLY,
+	SYS_RDWR
+};
+
+struct sysdef {
+	const char *name;
+	const char *prettyname;
+	int (*probe)(const struct sysdef *system);
+	int (*open)(uint8_t cpu, enum SysModes mode);
+	int (*close)(uint8_t cpu);
+	int (*rdmsr)(uint8_t cpu, uint32_t addr, struct msr *val);
+};
+
+#define SYSTEM_EOT .name = NULL
+#define SYSTEM_ISEOT(s) (NULL == (s).name)
+
+
+struct cpuid_t {
+	uint8_t family;
+	uint8_t model;
+	uint8_t stepping;
+	uint8_t ext_family;
+	uint8_t ext_model;
+};
+
+
+extern const struct sysdef *sys;
+
+extern uint8_t targets_found;
+extern const struct targetdef **targets;
+
+extern uint8_t reserved, verbose, quiet;
+
+#define printf_quiet(x...) do { if (!quiet) fprintf(stderr,x); } while(0)
+#define printf_verbose(x...) do { if (verbose && !quiet) fprintf(stderr,x); } while(0)
+
+#define SYSERROR(call, addr) do { \
+	const struct msrdef *m = findmsrdef(addr); \
+	if (m) \
+		fprintf(stderr, "%s: " #call "(0x%08x) %s: %s\n", __func__, addr, m->symbol, strerror(errno)); \
+	else \
+		fprintf(stderr, "%s: " #call "(0x%08x): %s\n", __func__, addr, strerror(errno)); \
+} while (0);
+
+/* sys.c */
+struct cpuid_t *cpuid(void);
+
+/* msrutils.c */
+void hexprint(FILE *f, const struct msr val, const uint8_t bits);
+int msr_eq(const struct msr a, const struct msr b);
+struct msr msr_shl(const struct msr a, const uint8_t bits);
+struct msr msr_shr(const struct msr a, const uint8_t bits);
+void msr_and(struct msr *a, const struct msr b);
+const struct msrdef *findmsrdef(const uint32_t addr);
+void dumpmsrdefs(const struct targetdef *t);
+int dumpmsrdefsvals(FILE *f, const struct targetdef *t, const uint8_t cpu);
+uint8_t str2msr(char *str, struct msr *msr);
+void decodemsr(const uint8_t cpu, const uint32_t addr, const struct msr val);
+uint8_t diff_msr(FILE *fout, const uint32_t addr, const struct msr a, const struct msr b);
+
+
+
+/** system externs **/
+
+/* linux.c */
+extern int linux_probe(const struct sysdef *system);
+extern int linux_open(uint8_t cpu, enum SysModes mode);
+extern int linux_close(uint8_t cpu);
+extern int linux_rdmsr(uint8_t cpu, uint32_t addr, struct msr *val);
+
+
+/** target externs **/
+
+/* geodelx.c */
+extern int geodelx_probe(const struct targetdef *t);
+extern const struct msrdef geodelx_msrs[];
+
+/* cs5536.c */
+extern int cs5536_probe(const struct targetdef *t);
+extern const struct msrdef cs5536_msrs[];
+
+#endif /* MSRTOOL_H */
diff --git a/util/msrtool/msrutils.c b/util/msrtool/msrutils.c
new file mode 100644
index 0000000000..3c64242a87
--- /dev/null
+++ b/util/msrtool/msrutils.c
@@ -0,0 +1,299 @@
+/*
+ * This file is part of msrtool.
+ *
+ * Copyright (c) 2008 Peter Stuge <peter@stuge.se>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "msrtool.h"
+
+static void print_bitdef(FILE *f, const struct msrbits *mb, const char *tail) {
+	uint8_t endbit;
+	if (!reserved && !strcmp(mb->name, "RSVD"))
+		return;
+	if (1 == mb->size)
+		fprintf(f, "# %5d", mb->start);
+	else {
+		endbit = mb->start - mb->size + 1;
+		fprintf(f, "# %*d:%d", endbit < 10 ? 3 : 2, mb->start, endbit);
+	}
+	if (!strcmp(mb->name, "RSVD"))
+		fprintf(f, " [%s]", mb->desc);
+	else
+		fprintf(f, " %s %s", mb->name, mb->desc);
+	fprintf(f, "%s", tail);
+}
+
+static void print_bitval(FILE *f, const struct msrbits *mb, const struct msr val) {
+	uint8_t i;
+	struct msr tmp, mask = MSR1(1);
+	const struct msrbitvalues *mbv = mb->bitval;
+	while (mbv->text && !msr_eq(mbv->value, val))
+		mbv++;
+	switch (mb->present) {
+	case PRESENT_BIN:
+		mask = msr_shl(mask, mb->size - 1);
+		for (i = 0; i < mb->size; i++) {
+			memcpy(&tmp, &val, sizeof(val));
+			msr_and(&tmp, mask);
+			fprintf(f, "%d", (tmp.hi || tmp.lo) ? 1 : 0);
+			mask = msr_shr(mask, 1);
+		}
+		/* TODO */
+		break;
+	case PRESENT_DEC:
+		fprintf(f, "%d", val.lo);
+		break;
+	case PRESENT_OCT:
+		fprintf(f, "0%o", val.lo);
+		break;
+	case PRESENT_HEX:
+		hexprint(f, val, mb->size);
+		break;
+	case PRESENT_HEXDEC:
+		hexprint(f, val, mb->size);
+		fprintf(f, " %d", val.lo);
+		break;
+	}
+	if (mbv->text)
+		fprintf(f, ": %s", mbv->text);
+	fprintf(f, "\n");
+}
+
+void hexprint(FILE *f, const struct msr val, const uint8_t bits) {
+	if (bits <= 4)
+		fprintf(f, "0x%x", (uint8_t)(val.lo & 0x0f));
+	else if (bits <= 8)
+		fprintf(f, "0x%02x", (uint8_t)(val.lo & 0xff));
+	else if (bits <= 16)
+		fprintf(f, "0x%04x", (uint16_t)(val.lo & 0xffff));
+	else if (bits <= 32)
+		fprintf(f, "0x%08x", val.lo);
+	else
+		fprintf(f, "0x%08x%08x", val.hi, val.lo);
+}
+
+int msr_eq(const struct msr a, const struct msr b) {
+	return a.hi == b.hi && a.lo == b.lo;
+}
+
+struct msr msr_shl(const struct msr a, const uint8_t bits) {
+	struct msr ret;
+
+	ret.hi = bits < 32 ? a.hi << bits : 0;
+	ret.lo = bits < 32 ? a.lo << bits : 0;
+
+	if (bits < 32)
+		ret.hi |= bits ? a.lo >> (32 - bits) : 0;
+	else
+		ret.hi |= a.lo << (bits - 32);
+
+	return ret;
+}
+
+struct msr msr_shr(const struct msr a, const uint8_t bits) {
+	struct msr ret;
+
+	ret.hi = bits < 32 ? a.hi >> bits : 0;
+	ret.lo = bits < 32 ? a.lo >> bits : 0;
+
+	if (bits < 32)
+		ret.lo |= bits ? a.hi << (32 - bits) : 0;
+	else
+		ret.lo |= a.hi >> (bits - 32);
+
+	return ret;
+}
+
+void msr_and(struct msr *a, const struct msr b) {
+	a->hi &= b.hi;
+	a->lo &= b.lo;
+}
+
+const struct msrdef *findmsrdef(const uint32_t addr) {
+	uint8_t t;
+	const struct msrdef *m;
+	if (!targets)
+		return NULL;
+	for (t = 0; t < targets_found; t++)
+		for (m = targets[t]->msrs; !MSR_ISEOT(*m); m++)
+			if (addr == m->addr)
+				return m;
+	return NULL;
+}
+
+void dumpmsrdefs(const struct targetdef *t) {
+	const struct msrdef *m;
+	const struct msrbits *mb;
+	if (!t)
+		return;
+	printf("# %s MSRs:\n", t->name);
+	for (m = t->msrs; !MSR_ISEOT(*m); m++) {
+		if (t->msrs != m)
+			printf("\n");
+		printf("# %s\n", m->symbol);
+		for (mb = m->bits; mb->size; mb++)
+			print_bitdef(stdout, mb, "\n");
+		printf("0x%08x\n", m->addr);
+	}
+}
+
+int dumpmsrdefsvals(FILE *f, const struct targetdef *t, const uint8_t cpu) {
+	struct msr val = MSR1(0);
+	const struct msrdef *m;
+	const struct msrbits *mb;
+	if (!t)
+		return 1;
+	fprintf(f, "# %s MSRs:\n", t->name);
+	for (m = t->msrs; !MSR_ISEOT(*m); m++) {
+		if (t->msrs != m)
+			fprintf(f, "\n");
+		if (!sys->rdmsr(cpu, m->addr, &val))
+			return 1;
+		fprintf(f, "# %s\n", m->symbol);
+		for (mb = m->bits; mb->size; mb++)
+			print_bitdef(f, mb, "\n");
+		fprintf(f, "0x%08x 0x%08x%08x\n", m->addr, val.hi, val.lo);
+	}
+	return 0;
+}
+
+/**
+ * Parse a hexadecimal string into an MSR value.
+ * 
+ * Leading 0x or 0X is optional, the string is always parsed as hexadecimal.
+ * Any non-hexadecimal character can be used to separate the high 32 bits and
+ * the low 32 bits. If there is such a separator, high and low values do not
+ * need to be zero padded. If there is no separator, the last <=8 digits are
+ * the low 32 bits and any characters before them are the high 32 bits.
+ * When there is no separator and less than eight digits, the high 32 bits
+ * are set to 0.
+ * Parsing fails when there is a separator and it is followed by another
+ * non-hexadecimal character.
+ *
+ * @param str The string to parse. The string must be writable but will be
+ * restored before return.
+ * @param msr Pointer to the struct msr where the value will be stored.
+ * @return 1 on success, 0 on parse failure. msr is unchanged on failure.
+ */
+uint8_t str2msr(char *str, struct msr *msr) {
+	char c;
+	size_t len, lo;
+	if (0 == strncmp(str, "0x", 2) || 0 == strncmp(str, "0X", 2))
+		str += 2;
+	len = strspn(str, HEXCHARS);
+	if (len <= 8 && 0 == str[len]) {
+		msr->hi = 0;
+		lo = 0;
+	} else if (len <= 8) {
+		lo = len + strcspn(str + len, HEXCHARS);
+		if (0 == len && 0 == strspn(str + lo, HEXCHARS))
+			return 0;
+		c = str[len];
+		str[len] = 0;
+		msr->hi = strtoul(str, NULL, 16);
+		str[len] = c;
+	} else {
+		lo = len - 8;
+		c = str[lo];
+		str[lo] = 0;
+		msr->hi = strtoul(str, NULL, 16);
+		str[lo] = c;
+	}
+	msr->lo = strtoul(str + lo, NULL, 16);
+	return 1;
+}
+
+void decodemsr(const uint8_t cpu, const uint32_t addr, const struct msr val) {
+	struct msr bitval, mask;
+	const struct msrdef *m = findmsrdef(addr);
+	const struct msrbits *mb;
+
+	if (m)
+		printf("# %s ", m->symbol);
+	printf("0x%08x = 0x%08x%08x\n", addr, val.hi, val.lo);
+	if (!m) {
+		fprintf(stderr, "Sorry - no definition exists for this MSR! Please add it and send a signed-off\n");
+		fprintf(stderr, "patch to coreboot@coreboot.org. Thanks for your help!\n");
+		return;
+	}
+
+	for (mb = m->bits; mb->size; mb++) {
+		if (!reserved && 0 == strcmp(mb->name, "RSVD"))
+			continue;
+		print_bitdef(stdout, mb, " = ");
+		mask.hi = mask.lo = 0xffffffff;
+		mask = msr_shr(mask, 64 - mb->size);
+		bitval = msr_shr(val, mb->start - mb->size + 1);
+		msr_and(&bitval, mask);
+		print_bitval(stdout, mb, bitval);
+	}
+}
+
+/**
+ * Compare two MSR values and print any differences with field definitions and
+ * both old and new values decoded.
+ *
+ * @param f Output stream.
+ * @param addr MSR address.
+ * @param a Left value.
+ * @param b Right value.
+ * @return 1 when a and b differ, 0 when they are equal or only reserved bits
+ * differ and processing of reserved bits was not requested (with -r).
+ */
+uint8_t diff_msr(FILE *f, const uint32_t addr, const struct msr a, const struct msr b) {
+	uint8_t ret = 0, first = 1;
+	struct msr aval, bval, mask;
+	const struct msrdef *m = findmsrdef(addr);
+	const struct msrbits *mb;
+
+	if (a.hi == b.hi && a.lo == b.lo)
+		return 0;
+
+	if (!m) {
+		fprintf(stderr, "MSR 0x%08x has no definition! Please add it and send a Signed-off-by patch\n", addr);
+		fprintf(stderr, "to coreboot@coreboot.org. Thank you for your help!\n");
+		return 1;
+	}
+
+	for (mb = m->bits; mb->size; mb++) {
+		if (!reserved && 0 == strcmp(mb->name, "RSVD"))
+			continue;
+		mask.hi = mask.lo = 0xffffffff;
+		mask = msr_shr(mask, 64 - mb->size);
+		aval = msr_shr(a, mb->start - mb->size + 1);
+		bval = msr_shr(b, mb->start - mb->size + 1);
+		msr_and(&aval, mask);
+		msr_and(&bval, mask);
+		if (msr_eq(aval, bval))
+			continue;
+		if (first) {
+			fprintf(f, "# %s\n", m->symbol);
+			fprintf(f, "-0x%08x 0x%08x%08x\n", addr, a.hi, a.lo);
+			fprintf(f, "+0x%08x 0x%08x%08x\n", addr, b.hi, b.lo);
+			first = 0;
+			ret = 1;
+		}
+		print_bitdef(f, mb, "\n-");
+		print_bitval(f, mb, aval);
+		fprintf(f, "+");
+		print_bitval(f, mb, bval);
+	}
+	return ret;
+}
diff --git a/util/msrtool/sys.c b/util/msrtool/sys.c
new file mode 100644
index 0000000000..95539c8677
--- /dev/null
+++ b/util/msrtool/sys.c
@@ -0,0 +1,42 @@
+/*
+ * This file is part of msrtool.
+ *
+ * Copyright (c) 2008 Peter Stuge <peter@stuge.se>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include "msrtool.h"
+
+static struct cpuid_t id;
+
+struct cpuid_t *cpuid(void) {
+	uint32_t outeax;
+	asm ("cpuid" : "=a" (outeax) : "a" (1) : "%ebx", "%ecx", "%edx");
+	id.stepping = outeax & 0xf;
+	outeax >>= 4;
+	id.model = outeax & 0xf;
+	outeax >>= 4;
+	id.family = outeax & 0xf;
+	outeax >>= 8;
+	id.ext_model = outeax & 0xf;
+	outeax >>= 4;
+	id.ext_family = outeax & 0xff;
+	if (0xf == id.family) {
+		/* Intel says always do this, AMD says only for family f */
+		id.model |= (id.ext_model << 4);
+		id.family += id.ext_family;
+	}
+	return &id;
+}