kern/81449: [PATCH] SMBIOS scan for loader

Jung-uk Kim jkim at niksun.com
Tue May 24 20:40:02 GMT 2005


>Number:         81449
>Category:       kern
>Synopsis:       [PATCH] SMBIOS scan for loader
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Tue May 24 20:40:01 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Jung-uk Kim
>Release:        FreeBSD 6.0-CURRENT amd64
>Organization:
NIKSUN, Inc.
>Environment:
System: FreeBSD xxx.xxx.xxx.xxx 6.0-CURRENT FreeBSD 6.0-CURRENT #0: Tue May 24 15:00:27 EDT 2005 jkim at xxx.xxx.xxx.xxx:/usr/src/sys/amd64/compile/BEASTIE amd64
>Description:
This patch scans static SMBIOS structures and exports the following environment
variables to loader:

hint.smbios.0.enabled		"YES" when SMBIOS is detected

hint.smbios.0.bios.vendor	BIOS vendor
hint.smbios.0.bios.version	BIOS version
hint.smbios.0.bios.reldate	BIOS release date

hint.smbios.0.system.maker	System manufacturer
hint.smbios.0.system.product	System product name
hint.smbios.0.system.version	System version number

hint.smbios.0.planar.maker	Base board manufacturer
hint.smbios.0.planar.product	Base board product name
hint.smbios.0.planar.version	Base board version number

hint.smbios.0.chassis.maker	Enclosure manufacturer
hint.smbios.0.chassis.version	Enclosure version

These strings can be used to detect hardware quirks and to set appropriate
flags.  For example, Compaq R3000 series and some HP laptops require

	hint.atkbd.0.flags="0x9"

to boot.  See amd64/67745 for more detail.
detail.
>How-To-Repeat:

>Fix:
	Modified files:
	sys/boot/i386/libi386		Makefile
	sys/boot/i386/libi386		libi386.h
	sys/boot/i386/loader		main.c

	Added file:
	sys/boot/i386/libi386		smbios.c

Index: sys/boot/i386/libi386/Makefile
===================================================================
RCS file: /home/ncvs/src/sys/boot/i386/libi386/Makefile,v
retrieving revision 1.37
diff -u -r1.37 Makefile
--- sys/boot/i386/libi386/Makefile	24 Oct 2004 15:32:49 -0000	1.37
+++ sys/boot/i386/libi386/Makefile	23 May 2005 15:39:03 -0000
@@ -8,7 +8,7 @@
 	comconsole.c devicename.c elf32_freebsd.c \
 	elf64_freebsd.c gatea20.c \
 	i386_copy.c i386_module.c nullconsole.c pxe.c pxetramp.s \
-	time.c vidconsole.c amd64_tramp.S
+	smbios.c time.c vidconsole.c amd64_tramp.S
 
 BOOT_COMCONSOLE_PORT?= 0x3f8
 CFLAGS+=	-DCOMPORT=${BOOT_COMCONSOLE_PORT}
Index: sys/boot/i386/libi386/libi386.h
===================================================================
RCS file: /home/ncvs/src/sys/boot/i386/libi386/libi386.h,v
retrieving revision 1.19
diff -u -r1.19 libi386.h
--- sys/boot/i386/libi386/libi386.h	22 Oct 2004 14:56:23 -0000	1.19
+++ sys/boot/i386/libi386/libi386.h	23 May 2005 15:39:03 -0000
@@ -99,6 +99,8 @@
 
 void	biosacpi_detect();
 
+void	smbios_detect();
+
 void	gateA20(void);
 
 int	i386_autoload(void);
--- sys/boot/i386/libi386/smbios.c	Mon May 23 11:38:29 2005
+++ sys/boot/i386/libi386/smbios.c	Fri May 20 21:50:45 2005
@@ -0,0 +1,176 @@
+/*-
+ * Copyright (c) 2005 Jung-uk Kim <jkim at niksun.com>
+ * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include <bootstrap.h>
+
+#include "btxv86.h"
+
+/*
+ * Detect SMBIOS and export information about the SMBIOS into the
+ * environment.
+ *
+ * System Management BIOS Reference Specification, v2.4 Final
+ * http://www.dmtf.org/standards/published_documents/DSP0134.pdf
+ */
+
+/*
+ * Spec. 2.1.1 SMBIOS Structure Table Entry Point
+ *
+ * 'The SMBIOS Entry Point structure, described below, can be located by
+ * application software by searching for the anchor-string on paragraph
+ * (16-byte) boundaries within the physical memory address range
+ * 000F0000h to 000FFFFFh.'
+ */
+#define	SMBIOS_START		0xf0000
+#define	SMBIOS_LENGTH		0x10000
+#define	SMBIOS_STEP		0x10
+#define	SMBIOS_SIG		"_SM_"
+#define	SMBIOS_DMI_SIG		"_DMI_"
+
+static u_int8_t	*smbios_parse_table(const u_int8_t *dmi);
+static void	smbios_setenv(const char *env, const u_int8_t *dmi,
+		    const int offset);
+static u_int8_t	smbios_checksum(const u_int8_t *addr, const u_int8_t len);
+static u_int8_t	*smbios_sigsearch(const caddr_t addr, const u_int32_t len);
+
+void
+smbios_detect(void)
+{
+	u_int8_t	*smbios, *dmi, *addr;
+	u_int16_t	i, length, count;
+	u_int32_t	paddr;
+
+	/* locate and validate the SMBIOS */
+	smbios = smbios_sigsearch(PTOV(SMBIOS_START), SMBIOS_LENGTH);
+	if (smbios == 0)
+		return;
+
+	/* export values from the SMBIOS */
+	setenv("hint.smbios.0.enabled", "YES", 1);
+
+	length = *(u_int16_t *)(smbios + 0x16);	/* Structure Table Length */
+	paddr = *(u_int32_t *)(smbios + 0x18);	/* Structure Table Address */
+	count = *(u_int16_t *)(smbios + 0x1c);	/* No of SMBIOS Structures */
+
+	for (dmi = addr = PTOV(paddr), i = 0;
+	     dmi - addr < length && i < count; i++)
+		dmi = smbios_parse_table(dmi);
+}
+
+static u_int8_t *
+smbios_parse_table(const u_int8_t *dmi)
+{
+	u_int8_t	*dp;
+
+	switch(dmi[0]) {
+	case 0:		/* Type 0: BIOS */
+		smbios_setenv("hint.smbios.0.bios.vendor", dmi, 0x04);
+		smbios_setenv("hint.smbios.0.bios.version", dmi, 0x05);
+		smbios_setenv("hint.smbios.0.bios.reldate", dmi, 0x08);
+		break;
+
+	case 1:		/* Type 1: System */
+		smbios_setenv("hint.smbios.0.system.maker", dmi, 0x04);
+		smbios_setenv("hint.smbios.0.system.product", dmi, 0x05);
+		smbios_setenv("hint.smbios.0.system.version", dmi, 0x06);
+		break;
+
+	case 2:		/* Type 2: Base Board (or Module) */
+		smbios_setenv("hint.smbios.0.planar.maker", dmi, 0x04);
+		smbios_setenv("hint.smbios.0.planar.product", dmi, 0x05);
+		smbios_setenv("hint.smbios.0.planar.version", dmi, 0x06);
+		break;
+
+	case 3:		/* Type 3: System Enclosure or Chassis */
+		smbios_setenv("hint.smbios.0.chassis.maker", dmi, 0x04);
+		smbios_setenv("hint.smbios.0.chassis.version", dmi, 0x06);
+		break;
+
+	default: /* skip other types */
+		break;
+	}
+	
+	/* find structure terminator */
+	dp = (u_int8_t *)(dmi + dmi[1]);
+	while (dp[0] != 0 || dp[1] != 0)
+		dp++;
+
+	return(dp + 2);
+}
+
+static void
+smbios_setenv(const char *str, const u_int8_t *dmi, const int offset)
+{
+	char		*cp;
+	int		i;
+
+	/* skip undefined string */
+	if (dmi[offset] == 0)
+		return;
+
+	for (cp = (char *)(dmi + dmi[1]), i = 0; i < dmi[offset] - 1; i++)
+		cp += strlen(cp) + 1;
+	setenv(str, cp, 1);
+}
+
+static u_int8_t
+smbios_checksum(const u_int8_t *addr, const u_int8_t len)
+{
+	u_int8_t	sum;
+	int		i;
+
+	for (sum = 0, i = 0; i < len; i++)
+		sum += addr[i];
+
+	return(sum);
+}
+
+static u_int8_t *
+smbios_sigsearch(const caddr_t addr, const u_int32_t len)
+{
+	caddr_t		cp;
+
+	/* search on 16-byte boundaries */
+	for (cp = addr; cp - addr < len; cp += SMBIOS_STEP) {
+		/* compare signature, validate checksum */
+		if (!strncmp(cp, SMBIOS_SIG, 4)) {
+			if (smbios_checksum(cp, *(cp + 0x05)))
+				continue;
+			if (strncmp(cp + 0x10, SMBIOS_DMI_SIG, 5))
+				continue;
+			if (smbios_checksum(cp + 0x10, 0x0f))
+				continue;
+
+			return(cp);
+		}
+	}
+
+	return(0);
+}
Index: sys/boot/i386/loader/main.c
===================================================================
RCS file: /home/ncvs/src/sys/boot/i386/loader/main.c,v
retrieving revision 1.30
diff -u -r1.30 main.c
--- sys/boot/i386/loader/main.c	22 Oct 2004 14:57:28 -0000	1.30
+++ sys/boot/i386/loader/main.c	23 May 2005 15:39:04 -0000
@@ -140,6 +140,9 @@
     /* detect ACPI for future reference */
     biosacpi_detect();
 
+    /* detect SMBIOS for future reference */
+    smbios_detect();
+
     printf("\n");
     printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
     printf("(%s, %s)\n", bootprog_maker, bootprog_date);
>Release-Note:
>Audit-Trail:
>Unformatted:


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