aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--drivers/firmware/dmi_scan.c62
1 files changed, 47 insertions, 15 deletions
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 3714e3c..fd3ae62 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -119,12 +119,12 @@ static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
return 0;
}
-static int __init dmi_checksum(const u8 *buf)
+static int __init dmi_checksum(const u8 *buf, u8 len)
{
u8 sum = 0;
int a;
- for (a = 0; a < 15; a++)
+ for (a = 0; a < len; a++)
sum += buf[a];
return sum == 0;
@@ -415,30 +415,57 @@ static int __init dmi_present(const char __iomem *p)
u8 buf[15];
memcpy_fromio(buf, p, 15);
- if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
+ if (dmi_checksum(buf, 15)) {
dmi_num = (buf[13] << 8) | buf[12];
dmi_len = (buf[7] << 8) | buf[6];
dmi_base = (buf[11] << 24) | (buf[10] << 16) |
(buf[9] << 8) | buf[8];
- /*
- * DMI version 0.0 means that the real version is taken from
- * the SMBIOS version, which we don't know at this point.
- */
- dmi_ver = (buf[14] & 0xf0) << 4 | (buf[14] & 0x0f);
- if (buf[14] != 0)
- printk(KERN_INFO "DMI %d.%d present.\n",
- buf[14] >> 4, buf[14] & 0xF);
- else
- printk(KERN_INFO "DMI present.\n");
if (dmi_walk_early(dmi_decode) == 0) {
+ if (dmi_ver)
+ pr_info("SMBIOS %d.%d present.\n",
+ dmi_ver >> 8, dmi_ver & 0xFF);
+ else {
+ dmi_ver = (buf[14] & 0xF0) << 4 |
+ (buf[14] & 0x0F);
+ pr_info("Legacy DMI %d.%d present.\n",
+ dmi_ver >> 8, dmi_ver & 0xFF);
+ }
dmi_dump_ids();
return 0;
}
}
+ dmi_ver = 0;
return 1;
}
+static int __init smbios_present(const char __iomem *p)
+{
+ u8 buf[32];
+ int offset = 0;
+
+ memcpy_fromio(buf, p, 32);
+ if ((buf[5] < 32) && dmi_checksum(buf, buf[5])) {
+ dmi_ver = (buf[6] << 8) + buf[7];
+
+ /* Some BIOS report weird SMBIOS version, fix that up */
+ switch (dmi_ver) {
+ case 0x021F:
+ case 0x0221:
+ pr_debug("SMBIOS version fixup(2.%d->2.%d)\n",
+ dmi_ver & 0xFF, 3);
+ dmi_ver = 0x0203;
+ break;
+ case 0x0233:
+ pr_debug("SMBIOS version fixup(2.%d->2.%d)\n", 51, 6);
+ dmi_ver = 0x0206;
+ break;
+ }
+ offset = 16;
+ }
+ return dmi_present(buf + offset);
+}
+
void __init dmi_scan_machine(void)
{
char __iomem *p, *q;
@@ -456,7 +483,7 @@ void __init dmi_scan_machine(void)
if (p == NULL)
goto error;
- rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
+ rc = smbios_present(p);
dmi_iounmap(p, 32);
if (!rc) {
dmi_available = 1;
@@ -474,7 +501,12 @@ void __init dmi_scan_machine(void)
goto error;
for (q = p; q < p + 0x10000; q += 16) {
- rc = dmi_present(q);
+ if (memcmp(q, "_SM_", 4) == 0 && q - p <= 0xFFE0)
+ rc = smbios_present(q);
+ else if (memcmp(q, "_DMI_", 5) == 0)
+ rc = dmi_present(q);
+ else
+ continue;
if (!rc) {
dmi_available = 1;
dmi_iounmap(p, 0x10000);