The following patch adds support for reading the SMBIOS table (which
contains system management information). It's required for IPMI and has
useful information in it. But anyway, since I did the work, I thought I
would post this.
It's relative to 2.5.9, but it should apply pretty cleanly to most other
kernels.
-Corey
--- ./arch/i386/kernel/pci-pc.c.smbios Fri Apr 26 10:59:55 2002
+++ ./arch/i386/kernel/pci-pc.c Fri Apr 26 11:00:13 2002
@@ -1293,6 +1293,10 @@
return;
}
+#ifdef CONFIG_SMBIOS
+extern void smbios_init(void);
+#endif
+
void __init pcibios_init(void)
{
int quad;
@@ -1322,6 +1326,10 @@
pcibios_fixup_irqs();
pcibios_resource_survey();
+
+#ifdef CONFIG_SMBIOS
+ smbios_init();
+#endif
#ifdef CONFIG_PCI_BIOS
if ((pci_probe & PCI_BIOS_SORT) && !(pci_probe & PCI_NO_SORT))
--- ./arch/i386/kernel/smbios.c.smbios Fri Apr 26 10:59:55 2002
+++ ./arch/i386/kernel/smbios.c Fri Apr 26 21:54:49 2002
@@ -0,0 +1,228 @@
+/*
+ * smbios.c
+ *
+ * MontaVista SMBIOS implementation.
+ *
+ * Author: MontaVista Software, Inc.
+ * Corey Minyard <minyard@mvista.com>
+ * source@mvista.com
+ *
+ * Copyright 2002 MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ *
+ * THIS SOFTWARE IS PROVIDED ``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.
+ *
+ * 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.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/smbios.h>
+
+#include <asm/page.h>
+typedef struct smbios_etable_s
+{
+ char anchor[4];
+ u8 csum;
+ u8 len;
+ u8 major_ver;
+ u8 minor_ver;
+ u16 max_struct_size;
+ u8 entry_point_rev;
+ u8 formatted_area[5];
+ u8 dmi_anchor_string[5];
+ u8 dmi_checksum;
+ u16 struct_table_len;
+ u32 struct_table_addr;
+ u16 num_struct_table_entries;
+ u8 smbios_bcd_rev;
+} smbios_etable_t;
+
+smbios_etable_t *smbios_etable;
+
+#define SMBIOS_SIGNATURE 0x5f4d535f /* "_SM_" */
+
+/* Return the next smbios structure following the given one. */
+static smbios_struct_t *next_entry(smbios_struct_t *curr)
+{
+ u8 *addr;
+
+ /* Skip over the structure first. */
+ addr = (u8 *) curr;
+ addr += curr->len;
+
+ /* Now skip over the string table. It's terminated with two
+ zeros. */
+ if (*addr == 0)
+ addr++;
+ while (*addr != 0) {
+ addr++;
+ if (*addr == 0)
+ addr++;
+ }
+ addr++;
+
+ return (smbios_struct_t *) addr;
+}
+
+char *smbios_get_string_num(smbios_struct_t *smbstr, int strnum)
+{
+ u8 *addr;
+
+ /* Skip over the structure first. */
+ addr = (u8 *) smbstr;
+ addr += smbstr->len;
+
+ /* Check for an empty string table. */
+ if ((*addr == 0) && (*(addr+1) == 0))
+ return NULL;
+
+ /* Handle the first string special. */
+ if (strnum == 0)
+ return (char *) addr;
+
+ /* Now scan string table. It's terminated with two zeros. */
+ while (*addr != 0) {
+ addr++;
+ if (*addr == 0) {
+ addr++;
+ strnum--;
+ if ((strnum == 0) && (*addr != 0))
+ return (char *) addr;
+ }
+ }
+
+ return NULL;
+}
+
+smbios_struct_t *smbios_find_struct_by_type(unsigned char type)
+{
+ smbios_struct_t *entry;
+ int i;
+
+ if (smbios_etable == NULL)
+ return NULL;
+
+ entry = ((smbios_struct_t *) __va(smbios_etable->struct_table_addr));
+ for (i=0; i<smbios_etable->num_struct_table_entries; i++)
+ {
+ if (entry->type == type) {
+ return entry;
+ }
+ entry = next_entry(entry);
+ }
+
+ return NULL;
+}
+
+smbios_struct_t *smbios_next_struct_by_type(smbios_struct_t *old_entry)
+{
+ int i;
+ int found = 0;
+ int type = old_entry->type;
+ smbios_struct_t *entry;
+
+ if (smbios_etable == NULL)
+ return NULL;
+
+ entry = ((smbios_struct_t *) __va(smbios_etable->struct_table_addr));
+ for (i=0; i<smbios_etable->num_struct_table_entries; i++)
+ {
+ if (entry == old_entry)
+ found = 1;
+ else if (found && (entry->type == type)) {
+ return entry;
+ }
+ entry = next_entry(entry);
+ }
+
+ return NULL;
+}
+
+void __init hexdump (u8 *data, int len)
+{
+ char str[80];
+ char *ptr;
+ int i;
+
+ str[0] = ' ';
+ ptr = str + 1;
+ for (i=0; i<len; i++) {
+ ptr += sprintf(ptr, " %2.2x", *data);
+ data++;
+ if (((i%16) == 0) && (i != 0)) {
+ printk("%s\n", str);
+ data[0] = ' ';
+ ptr = str + 1;
+ }
+ }
+
+ if ((i%16) != 0)
+ printk("%s\n", str);
+}
+
+void __init smbios_init(void)
+{
+ smbios_struct_t *entry;
+ u8 *addr, *summer;
+ u8 csum;
+ int i;
+
+ smbios_etable = NULL;
+
+ for(addr = (u8 *) __va(0xf0000);
+ addr < (u8 *) __va(0x100000);
+ addr += 16)
+ {
+ if (*((u32 *) addr) == SMBIOS_SIGNATURE) {
+ summer = addr;
+ csum = 0;
+ for (i=0; i<*(addr+5); i++, summer++)
+ csum += *summer;
+ if (csum == 0) {
+ printk("Found SMBIOS entry table at %8.8lx\n",
+ (unsigned long) addr);
+ smbios_etable = (smbios_etable_t *) addr;
+ break;
+ }
+ }
+ }
+
+#ifdef DEBUG
+ if (smbios_etable) {
+ int j;
+ char *str;
+ entry = ((smbios_struct_t *)
+ __va(smbios_etable->struct_table_addr));
+ for (i=0; i<smbios_etable->num_struct_table_entries; i++)
+ {
+ printk(" Entry %d is type %d\n", i, entry->type);
+ hexdump((u8 *) entry, entry->len);
+ for (j=0; ; j++) {
+ str = smbios_get_string_num(entry, j);
+ if (str == NULL)
+ break;
+ printk(" string %d is '%s'\n", j, str);
+ }
+ entry = next_entry(entry);
+ }
+ }
+#endif
+}
--- ./arch/i386/kernel/Makefile.smbios Fri Apr 26 10:59:55 2002
+++ ./arch/i386/kernel/Makefile Fri Apr 26 11:00:13 2002
@@ -30,6 +30,9 @@
obj-y += pci-pc.o pci-irq.o
endif
endif
+ifdef CONFIG_SMBIOS
+obj-y += smbios.o
+endif
obj-$(CONFIG_MCA) += mca.o
obj-$(CONFIG_MTRR) += mtrr.o
--- ./arch/i386/config.in.smbios Fri Apr 26 10:59:55 2002
+++ ./arch/i386/config.in Fri Apr 26 11:00:13 2002
@@ -236,6 +236,7 @@
define_bool CONFIG_PCI_DIRECT y
fi
fi
+ bool 'SMBIOS support' CONFIG_SMBIOS
fi
source drivers/pci/Config.in
--- ./arch/i386/Config.help.smbios Fri Apr 26 11:01:39 2002
+++ ./arch/i386/Config.help Fri Apr 26 11:01:13 2002
@@ -936,3 +936,8 @@
CONFIG_DEBUG_OBSOLETE
Say Y here if you want to reduce the chances of the tree compiling,
and are prepared to dig into driver internals to fix compile errors.
+
+CONFIG_SMBIOS
+ Look for the SM BIOS configuration tables in memory, and if they are
+ there record information about them. Other things like IPMI use
+ these tables and require this to be set.
--- ./include/linux/smbios.h.smbios Fri Apr 26 10:59:56 2002
+++ ./include/linux/smbios.h Fri Apr 26 11:00:14 2002
@@ -0,0 +1,59 @@
+/*
+ * smbios.h
+ *
+ * MontaVista SMBIOS implementation.
+ *
+ * Author: MontaVista Software, Inc.
+ * Corey Minyard <minyard@mvista.com>
+ * source@mvista.com
+ *
+ * Copyright 2002 MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ *
+ * THIS SOFTWARE IS PROVIDED ``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.
+ *
+ * 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.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __LINUX_SMBIOS_H
+#define __LINUX_SMBIOS_H
+
+#include <asm/types.h>
+
+/* Header for an SMBIOS structure. */
+typedef struct smbios_struct_s
+{
+ u8 type;
+ u8 len;
+ u16 handle;
+} smbios_struct_t;
+
+/* Get the string numbered strnum from the string table for the entry.
+ returns NULL if the string doesn't exist. */
+char *smbios_get_string_num(smbios_struct_t *smbstr, int strnum);
+
+/* Find the first structure with the given type in the SMBIOS table.
+ Returns NULL if the structure doesn't exist. */
+smbios_struct_t *smbios_find_struct_by_type(unsigned char type);
+
+/* Return the next structure after old_entry with the same type
+ as old_entry. */
+smbios_struct_t *smbios_next_struct_by_type(smbios_struct_t *old_entry);
+
+#endif /* __LINUX_SMBIOS_H */
-
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