mirror of
https://github.com/torvalds/linux
synced 2024-07-22 19:21:07 +00:00
d7f96f97c4
Some utils, like dmidecode and smbios, need to access SMBIOS entry table area in order to get information like SMBIOS version, size, etc. Currently it's done via /dev/mem. But for situation when /dev/mem usage is disabled, the utils have to use dmi sysfs instead, which doesn't represent SMBIOS entry and adds code/delay redundancy when direct access for table is needed. So this patch creates dmi/tables and adds SMBIOS entry point to allow utils in question to work correctly without /dev/mem. Also patch adds raw dmi table to simplify dmi table processing in user space, as proposed by Jean Delvare. Tested-by: Roy Franz <roy.franz@linaro.org> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@globallogic.com> Signed-off-by: Jean Delvare <jdelvare@suse.de>
23 lines
907 B
Plaintext
23 lines
907 B
Plaintext
What: /sys/firmware/dmi/tables/
|
|
Date: April 2015
|
|
Contact: Ivan Khoronzhuk <ivan.khoronzhuk@globallogic.com>
|
|
Description:
|
|
The firmware provides DMI structures as a packed list of
|
|
data referenced by a SMBIOS table entry point. The SMBIOS
|
|
entry point contains general information, like SMBIOS
|
|
version, DMI table size, etc. The structure, content and
|
|
size of SMBIOS entry point is dependent on SMBIOS version.
|
|
The format of SMBIOS entry point and DMI structures
|
|
can be read in SMBIOS specification.
|
|
|
|
The dmi/tables provides raw SMBIOS entry point and DMI tables
|
|
through sysfs as an alternative to utilities reading them
|
|
from /dev/mem. The raw SMBIOS entry point and DMI table are
|
|
presented as binary attributes and are accessible via:
|
|
|
|
/sys/firmware/dmi/tables/smbios_entry_point
|
|
/sys/firmware/dmi/tables/DMI
|
|
|
|
The complete DMI information can be obtained using these two
|
|
tables.
|