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New tables can be loaded by creating directories under /config/table/ and writing the AML code into the aml table attribute. Various table attributes will be readable once the table is successfully loaded. Unloading tables is not supported at the moment, but it can be easily implemented once ACPI loading functions provide a table handle to be used for unloading. Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
What: /config/acpi
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Date: July 2016
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KernelVersion: 4.8
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Contact: linux-acpi@vger.kernel.org
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Description:
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This represents the ACPI subsystem entry point directory. It
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contains sub-groups corresponding to ACPI configurable options.
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What: /config/acpi/table
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Date: July 2016
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KernelVersion: 4.8
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Description:
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This group contains the configuration for user defined ACPI
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tables. The attributes of a user define table are:
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aml - a binary attribute that the user can use to
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fill in the ACPI aml definitions. Once the aml
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data is written to this file and the file is
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closed the table will be loaded and ACPI devices
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will be enumerated. To check if the operation is
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successful the user must check the error code
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for close(). If the operation is successful,
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subsequent writes to this attribute will fail.
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The rest of the attributes are read-only and are valid only
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after the table has been loaded by filling the aml entry:
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signature - ASCII table signature
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length - length of table in bytes, including the header
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revision - ACPI Specification minor version number
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oem_id - ASCII OEM identification
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oem_table_id - ASCII OEM table identification
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oem_revision - OEM revision number
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asl_compiler_id - ASCII ASL compiler vendor ID
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asl_compiler_revision - ASL compiler version
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