diff options
Diffstat (limited to 'Documentation/ABI/testing/sysfs-firmware-gsmi')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-firmware-gsmi | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-firmware-gsmi b/Documentation/ABI/testing/sysfs-firmware-gsmi new file mode 100644 index 0000000000..7a558354c1 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-firmware-gsmi @@ -0,0 +1,58 @@ +What: /sys/firmware/gsmi +Date: March 2011 +Contact: Mike Waychison <mikew@google.com> +Description: + Some servers used internally at Google have firmware + that provides callback functionality via explicit SMI + triggers. Some of the callbacks are similar to those + provided by the EFI runtime services page, but due to + historical reasons this different entry-point has been + used. + + The gsmi driver implements the kernel's abstraction for + these firmware callbacks. Currently, this functionality + is limited to handling the system event log and getting + access to EFI-style variables stored in nvram. + + Layout: + + /sys/firmware/gsmi/vars: + + This directory has the same layout (and + underlying implementation as /sys/firmware/efi/vars. + See `Documentation/ABI/*/sysfs-firmware-efi-vars` + for more information on how to interact with + this structure. + + /sys/firmware/gsmi/append_to_eventlog - write-only: + + This file takes a binary blob and passes it onto + the firmware to be timestamped and appended to + the system eventlog. The binary format is + interpreted by the firmware and may change from + platform to platform. The only kernel-enforced + requirement is that the blob be prefixed with a + 32bit host-endian type used as part of the + firmware call. + + /sys/firmware/gsmi/clear_config - write-only: + + Writing any value to this file will cause the + entire firmware configuration to be reset to + "factory defaults". Callers should assume that + a reboot is required for the configuration to be + cleared. + + /sys/firmware/gsmi/clear_eventlog - write-only: + + This file is used to clear out a portion/the + whole of the system event log. Values written + should be values between 1 and 100 inclusive (in + ASCII) representing the fraction of the log to + clear. Not all platforms support fractional + clearing though, and this writes to this file + will error out if the firmware doesn't like your + submitted fraction. + + Callers should assume that a reboot is needed + for this operation to complete. |