Scan static SMBIOS structures and export 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.

Note: Please do not abuse this feature to resolve general problem when it
      can be fixed programmatically.  This must be used as a last resort.

PR:		kern/81449
Approved by:	anholt (mentor)

sys/boot/i386/libi386/Makefile

@@ -8,7 +8,7 @@ SRCS=	biosacpi.c bioscd.c biosdisk.c biosmem.c biospnp.c \
 	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}

sys/boot/i386/libi386/libi386.h

@@ -99,6 +99,8 @@ int biospci_read_config(uint32_t locator, int offset, int width, uint32_t *val);
 
 void	biosacpi_detect();
 
+void	smbios_detect();
+
 void	gateA20(void);
 
 int	i386_autoload(void);

sys/boot/i386/libi386/smbios.c

@@ -0,0 +1,176 @@
+/*-
+ * Copyright (c) 2005 Jung-uk Kim <jkim@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 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 == NULL)
+		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(NULL);
+}

sys/boot/i386/loader/main.c

@@ -144,6 +144,9 @@ main(void)
     /* 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);