OEM DMI type 212 is used by libsmbios to access the CMOS memory
on Dell machines. Include the available information in the
output of dmidecode.
Signed-off-by: Armin Wolf <w_ar...@gmx.de>
---
dmioem.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/dmioem.c b/dmioem.c
index d35ccb6..e5b0902 100644
--- a/dmioem.c
+++ b/dmioem.c
@@ -144,6 +144,48 @@ static void dmi_dell_bios_flags(u64 flags)
pr_attr("ACPI WMI Supported", "%s", (flags.l & (1 << 1)) ? "Yes" :
"No");
}
+static void dmi_dell_indexed_io_access(const struct dmi_header *h)
+{
+ static const char *checksum_types[] = {
+ "Word Checksum",
+ "Byte Checksum",
+ "CRC Checksum",
+ "Negative Word Checksum", /* 0x03 */
+ };
+ int tokens = (h->length - 0x0C) / 0x05;
+ const char *str = out_of_spec;
+ u8 *data = h->data;
+ u8 *token;
+ u8 type;
+
+ pr_attr("Index Port", "0x%04x", WORD(data + 0x04));
+ pr_attr("Data Port", "0x%04x", WORD(data + 0x06));
+
+ type = data[0x08];
+ if (type < ARRAY_SIZE(checksum_types))
+ str = checksum_types[type];
+
+ pr_attr("Type", "%s", str);
+ pr_attr("Checked Range Start Index", "0x%02x", data[0x09]);
+ pr_attr("Checked Range End Index", "0x%02x", data[0x0a]);
+ pr_attr("Check Value Index", "0x%02x", data[0x0b]);
+
+ /*
+ * Final token seems to be a terminator, so we ignore it.
+ */
+ if (tokens <= 1)
+ return;
+
+ pr_list_start("Tokens", NULL);
+ for (int i = 0; i < tokens - 1; i++)
+ {
+ token = data + 0x0C + 0x05 * i;
+ pr_list_item("0x%04x (location 0x%02x, AND mask 0x%02x, OR
mask 0x%02x)",
+ WORD(token + 0x00), token[0x02], token[0x03],
token[0x04]);
+ }
+ pr_list_end();
+}
+
static void dmi_dell_token_interface(const struct dmi_header *h)
{
int tokens = (h->length - 0x0B) / 0x06;
@@ -183,6 +225,12 @@ static int dmi_decode_dell(const struct dmi_header *h)
dmi_dell_bios_flags(QWORD(data + 0x04));
break;
+ case 212:
+ pr_handle_name("Dell Indexed IO Access");
+ if (h->length < 0x0C) break;
+ dmi_dell_indexed_io_access(h);
+ break;
+
case 218:
pr_handle_name("Dell Token Interface");
if (h->length < 0x0B) break;
--
2.39.2
