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The "gsmi" driver bridges userland with firmware specific routines for accessing hardware. Currently, this driver only supports NVRAM and eventlog information. Deprecated functions have been removed from the driver, though their op-codes are left in place so that they are not re-used. This driver works by trampolining into the firmware via the smi_command outlined in the FADT table. Three protocols are used due to various limitations over time, but all are included herein. This driver should only ever load on Google boards, identified by either a "Google, Inc." board vendor string in DMI, or "GOOGLE" in the OEM strings of the FADT ACPI table. This logic happens in gsmi_system_valid(). Signed-off-by: Duncan Laurie <dlaurie@google.com> Signed-off-by: Aaron Durbin <adurbin@google.com> Signed-off-by: Mike Waychison <mikew@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
10 lines
308 B
Plaintext
10 lines
308 B
Plaintext
config GOOGLE_SMI
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tristate "SMI interface for Google platforms"
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depends on ACPI && DMI
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select EFI_VARS
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help
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Say Y here if you want to enable SMI callbacks for Google
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platforms. This provides an interface for writing to and
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clearing the EFI event log and reading and writing NVRAM
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variables.
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