I have been working on Alan's userspace program "dmidecode" recently, and made some fixes to it. It happens that this userspace program shares some code with linux/arch/i386/dmi_scan.c, so I thought it would be a good idea to backport the changes that apply to the linux kernel tree. I have been writing patches for Linux 2.2, 2.4 and 2.5.
This specific patch applies to the Linux 2.5 tree and has been built against 2.5.40.
Main changes:
- Verify the DMI entry point structure checksum.
- Start looking for the DMI entry point from 0xF0000, not 0xE0000.
- Fix an off-by-one error causing the last address scanned being
0x100000, not 0xFFFF0 as it should.
- Do not display the DMI version if it would be 0.0.
- Remove senseless tests in dump (debug) code.
Other changes are simple cleanups and should be straightforward to understand.
All comments are of course welcome.
--- linux-2.5.40/arch/i386/kernel/dmi_scan.c.orig Sun Sep 22 06:25:06 2002
+++ linux-2.5.40/arch/i386/kernel/dmi_scan.c Thu Oct 3 22:58:07 2002
@@ -59,7 +59,7 @@
data = buf;
/*
- * Stop when we see al the items the table claimed to have
+ * Stop when we see all the items the table claimed to have
* OR we run off the end of the table (also happens)
*/
@@ -89,11 +89,20 @@
}
+inline static int __init dmi_checksum(u8 *buf)
+{
+ u8 sum=0;
+ int a;
+
+ for(a=0; a<15; a++)
+ sum+=buf[a];
+ return (sum==0);
+}
+
static int __init dmi_iterate(void (*decode)(struct dmi_header *))
{
- unsigned char buf[20];
- long fp=0xE0000L;
- fp -= 16;
+ u8 buf[15];
+ u32 fp=0xF0000;
#ifdef CONFIG_SIMNOW
/*
@@ -105,24 +114,30 @@
while( fp < 0xFFFFF)
{
- fp+=16;
- isa_memcpy_fromio(buf, fp, 20);
- if(memcmp(buf, "_DMI_", 5)==0)
+ isa_memcpy_fromio(buf, fp, 15);
+ if(memcmp(buf, "_DMI_", 5)==0 && dmi_checksum(buf))
{
u16 num=buf[13]<<8|buf[12];
u16 len=buf[7]<<8|buf[6];
u32 base=buf[11]<<24|buf[10]<<16|buf[9]<<8|buf[8];
- dmi_printk((KERN_INFO "DMI %d.%d present.\n",
- buf[14]>>4, buf[14]&0x0F));
+ /*
+ * DMI version 0.0 means that the real version is taken from
+ * the SMBIOS version, which we don't know at this point.
+ */
+ if(buf[14]!=0)
+ dmi_printk((KERN_INFO "DMI %d.%d present.\n",
+ buf[14]>>4, buf[14]&0x0F));
+ else
+ dmi_printk((KERN_INFO "DMI present.\n"));
dmi_printk((KERN_INFO "%d structures occupying %d bytes.\n",
- buf[13]<<8|buf[12],
- buf[7]<<8|buf[6]));
+ num, len));
dmi_printk((KERN_INFO "DMI table at 0x%08X.\n",
- buf[11]<<24|buf[10]<<16|buf[9]<<8|buf[8]));
+ base));
if(dmi_table(base,len, num, decode)==0)
return 0;
}
+ fp+=16;
}
return -1;
}
@@ -800,59 +815,43 @@
static void __init dmi_decode(struct dmi_header *dm)
{
u8 *data = (u8 *)dm;
- char *p;
switch(dm->type)
{
case 0:
- p=dmi_string(dm,data[4]);
- if(*p)
- {
- dmi_printk(("BIOS Vendor: %s\n", p));
- dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
- dmi_printk(("BIOS Version: %s\n",
- dmi_string(dm, data[5])));
- dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
- dmi_printk(("BIOS Release: %s\n",
- dmi_string(dm, data[8])));
- dmi_save_ident(dm, DMI_BIOS_DATE, 8);
- }
+ dmi_printk(("BIOS Vendor: %s\n",
+ dmi_string(dm, data[4])));
+ dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
+ dmi_printk(("BIOS Version: %s\n",
+ dmi_string(dm, data[5])));
+ dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
+ dmi_printk(("BIOS Release: %s\n",
+ dmi_string(dm, data[8])));
+ dmi_save_ident(dm, DMI_BIOS_DATE, 8);
break;
-
case 1:
- p=dmi_string(dm,data[4]);
- if(*p)
- {
- dmi_printk(("System Vendor: %s.\n",p));
- dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
- dmi_printk(("Product Name: %s.\n",
- dmi_string(dm, data[5])));
- dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
- dmi_printk(("Version %s.\n",
- dmi_string(dm, data[6])));
- dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
- dmi_printk(("Serial Number %s.\n",
- dmi_string(dm, data[7])));
- }
+ dmi_printk(("System Vendor: %s\n",
+ dmi_string(dm, data[4])));
+ dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
+ dmi_printk(("Product Name: %s\n",
+ dmi_string(dm, data[5])));
+ dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
+ dmi_printk(("Version: %s\n",
+ dmi_string(dm, data[6])));
+ dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
+ dmi_printk(("Serial Number: %s\n",
+ dmi_string(dm, data[7])));
break;
case 2:
- p=dmi_string(dm,data[4]);
- if(*p)
- {
- dmi_printk(("Board Vendor: %s.\n",p));
- dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
- dmi_printk(("Board Name: %s.\n",
- dmi_string(dm, data[5])));
- dmi_save_ident(dm, DMI_BOARD_NAME, 5);
- dmi_printk(("Board Version: %s.\n",
- dmi_string(dm, data[6])));
- dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
- }
- break;
- case 3:
- p=dmi_string(dm,data[8]);
- if(*p && *p!=' ')
- dmi_printk(("Asset Tag: %s.\n", p));
+ dmi_printk(("Board Vendor: %s\n",
+ dmi_string(dm, data[4])));
+ dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
+ dmi_printk(("Board Name: %s\n",
+ dmi_string(dm, data[5])));
+ dmi_save_ident(dm, DMI_BOARD_NAME, 5);
+ dmi_printk(("Board Version: %s\n",
+ dmi_string(dm, data[6])));
+ dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
break;
}
}
___________________________________
Webmail Nerim, http://www.nerim.net/
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