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linux-kerneluefi

How do I access UEFI SMBIOS table from Linux kernel space?

I want to write a Linux kernel module that do stuff depending on the board vendor and product version.

In userspace, I could just read files under /sys/class/dmi/id/*, but they are not available in kernel space.

I think I should collect data from UEFI SMBIOS table. Can I do it without hardcoding the exact memory address where each vendor uses to save the SMBIOS table?

Solution

  • I figured out by myself.

    There's a library to access DMI and obtain these information:

    #include <linux/dmi.h>

const char *board_vendor, *product_version;
board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
product_version = dmi_get_system_info(DMI_PRODUCT_VERSION);