- Add cpuctl(4) pseudo-device driver to provide access to some low-level

  features of CPUs like reading/writing machine-specific registers,
  retrieving cpuid data, and updating microcode.
- Add cpucontrol(8) utility, that provides userland access to
  the features of cpuctl(4).
- Add subsequent manpages.

The cpuctl(4) device operates as follows. The pseudo-device node cpuctlX
is created for each cpu present in the systems. The pseudo-device minor
number corresponds to the cpu number in the system. The cpuctl(4) pseudo-
device allows a number of ioctl to be preformed, namely RDMSR/WRMSR/CPUID
and UPDATE. The first pair alows the caller to read/write machine-specific
registers from the correspondent CPU. cpuid data could be retrieved using
the CPUID call, and microcode updates are applied via UPDATE.

The permissions are inforced based on the pseudo-device file permissions.
RDMSR/CPUID will be allowed when the caller has read access to the device
node, while WRMSR/UPDATE will be granted only when the node is opened
for writing. There're also a number of priv(9) checks.

The cpucontrol(8) utility is intened to provide userland access to
the cpuctl(4) device features. The utility also allows one to apply
cpu microcode updates.

Currently only Intel and AMD cpus are supported and were tested.

Approved by:	kib
Reviewed by:	rpaulo, cokane, Peter Jeremy
MFC after:	1 month

1 files changed, 70 insertions, 0 deletions

diff --git a/usr.sbin/cpucontrol/intel.h b/usr.sbin/cpucontrol/intel.h
new file mode 100644
index 0000000..0303e69
--- /dev/null
+++ b/usr.sbin/cpucontrol/intel.h
@@ -0,0 +1,70 @@
+/*-
+ * Copyright (c) 2006, 2008 Stanislav Sedov <stas@FreeBSD.org>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef INTEL_H
+#define	INTEL_H
+
+/*
+ * Prototypes.
+ */
+ucode_probe_t	intel_probe;
+ucode_update_t	intel_update;
+
+typedef struct intel_fw_header {
+	uint32_t	header_version;		/* Version of the header. */
+	int32_t		revision;		/* Unique version number. */
+	uint32_t	date;			/* Date of creation in BCD. */
+	uint32_t	cpu_signature;		/* Extended family, extended
+						   model, type, family, model
+						   and stepping. */
+	uint32_t	checksum;		/* Sum of all DWORDS should
+						   be 0. */
+	uint32_t	loader_revision;	/* Version of the loader
+						   required to load update. */
+	uint32_t	cpu_flags;		/* Platform IDs encoded in
+						   the lower 8 bits. */
+	uint32_t	data_size;
+	uint32_t	total_size;
+	uint8_t		reserved[12];
+} intel_fw_header_t;
+
+typedef struct intel_cpu_signature {
+	uint32_t	cpu_signature;
+	uint32_t	cpu_flags;
+	uint32_t	checksum;
+} intel_cpu_signature_t;
+
+typedef struct intel_ext_header {
+	uint32_t	sig_count;
+	uint32_t	checksum;
+	uint8_t		reserved[12];
+} intel_ext_header_t;
+
+#define	INTEL_HEADER_VERSION	0x00000001
+#define	INTEL_LOADER_REVISION	0x00000001
+
+#endif /* !INTEL_H */