[coreboot] msrtool: freebsd support

[Andriy Gapon]

Please review the following patch that adds FreeBSD support to msrtool.
MSR values are obtained via /dev/cpuctl ioctl interface.
Signed-off-by:	Andriy Gapon <avg at icyb.net.ua>

Index: msrtool.c
===================================================================
--- msrtool.c	(revision 4776)
+++ msrtool.c	(working copy)
@@ -49,6 +49,7 @@
 static struct sysdef allsystems[] = {
 	{ "linux", "Linux with /dev/cpu/*/msr", linux_probe, linux_open, linux_close,
linux_rdmsr },
 	{ "darwin", "OS X with DirectIO", darwin_probe, darwin_open, darwin_close,
darwin_rdmsr },
+	{ "freebsd", "FreeBSD with /dev/cpuctl*", freebsd_probe, freebsd_open,
freebsd_close, freebsd_rdmsr },
 	{ SYSTEM_EOT }
 };


Index: Makefile.in
===================================================================
--- Makefile.in	(revision 4776)
+++ Makefile.in	(working copy)
@@ -27,7 +27,7 @@
 LDFLAGS = @LDFLAGS@

 TARGETS = geodelx.o cs5536.o k8.o
-SYSTEMS = linux.o darwin.o
+SYSTEMS = linux.o darwin.o freebsd.o
 OBJS    = $(PROGRAM).o msrutils.o sys.o $(SYSTEMS) $(TARGETS)

 all: $(PROGRAM)
Index: msrtool.h
===================================================================
--- msrtool.h	(revision 4776)
+++ msrtool.h	(working copy)
@@ -28,6 +28,10 @@
 #define __DARWIN__
 #include <DirectIO/darwinio.h>
 #endif
+#if defined(__FreeBSD__)
+#include <sys/ioctl.h>
+#include <sys/cpuctl.h>
+#endif
 #include <pci/pci.h>

 #define HEXCHARS "0123456789abcdefABCDEF"
@@ -186,6 +190,12 @@
 extern int darwin_close(uint8_t cpu);
 extern int darwin_rdmsr(uint8_t cpu, uint32_t addr, struct msr *val);

+/* freebsd.c */
+extern int freebsd_probe(const struct sysdef *system);
+extern int freebsd_open(uint8_t cpu, enum SysModes mode);
+extern int freebsd_close(uint8_t cpu);
+extern int freebsd_rdmsr(uint8_t cpu, uint32_t addr, struct msr *val);
+
 /** target externs **/

 /* geodelx.c */
Index: freebsd.c
===================================================================
--- freebsd.c	(revision 0)
+++ freebsd.c	(revision 0)
@@ -0,0 +1,96 @@
+/*
+ * This file is part of msrtool.
+ *
+ * Copyright (c) 2009 coresystems GmbH
+ *
+ * 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 freebsd_probe(const struct sysdef *system)
+{
+#ifdef __FreeBSD__
+	struct stat st;
+
+	return stat("/dev/cpuctl0", &st) == 0;
+#else
+	return 0;
+#endif
+}
+
+int freebsd_open(uint8_t cpu, enum SysModes mode)
+{
+#ifdef __FreeBSD__
+	char devname[32];
+
+	if (cpu >= MAX_CORES)
+		return 0;
+
+	snprintf(devname, sizeof(devname), "/dev/cpuctl%u", cpu);
+	msr_fd[cpu] = open(devname, O_RDONLY);
+	if (msr_fd[cpu] < 0) {
+		perror(devname);
+		return 0;
+	}
+	return 1;
+#else
+	return 0;
+#endif
+}
+
+int freebsd_close(uint8_t cpu)
+{
+	if (cpu >= MAX_CORES)
+		return 0;
+
+	if (msr_fd[cpu] != -1)
+		close(msr_fd[cpu]);
+	msr_fd[cpu] = -1;
+	return 1;
+}
+
+int freebsd_rdmsr(uint8_t cpu, uint32_t addr, struct msr *val)
+{
+#ifdef __FreeBSD__
+	cpuctl_msr_args_t args;
+
+	if (cpu >= MAX_CORES)
+		return 0;
+
+	if (msr_fd[cpu] < 0)
+		return 0;
+
+	args.msr = addr;
+	if (ioctl(msr_fd[cpu], CPUCTL_RDMSR, &args) < 0) {
+		perror("CPUCTL_RDMSR");
+		return 0;
+	}
+
+	val->hi = args.data >> 32;
+	val->lo = args.data & 0xffffffff;
+	return 1;
+#else
+	return 0;
+#endif
+}


-- 
Andriy Gapon