// SPDX-License-Identifier: GPL-2.0 /* * Address translation interface via ACPI DSM. * Copyright (C) 2018 Intel Corporation * * Specification for this interface is available at: * * https://cdrdv2.intel.com/v1/dl/getContent/603354 */ #include <linux/acpi.h> #include <linux/adxl.h> #define ADXL_REVISION … #define ADXL_IDX_GET_ADDR_PARAMS … #define ADXL_IDX_FORWARD_TRANSLATE … #define ACPI_ADXL_PATH … /* * The specification doesn't provide a limit on how many * components are in a memory address. But since we allocate * memory based on the number the BIOS tells us, we should * defend against insane values. */ #define ADXL_MAX_COMPONENTS … #undef pr_fmt #define pr_fmt(fmt) … static acpi_handle handle; static union acpi_object *params; static const guid_t adxl_guid = …; static int adxl_count; static char **adxl_component_names; static union acpi_object *adxl_dsm(int cmd, union acpi_object argv[]) { … } /** * adxl_get_component_names - get list of memory component names * Returns NULL terminated list of string names * * Give the caller a pointer to the list of memory component names * e.g. { "SystemAddress", "ProcessorSocketId", "ChannelId", ... NULL } * Caller should count how many strings in order to allocate a buffer * for the return from adxl_decode(). */ const char * const *adxl_get_component_names(void) { … } EXPORT_SYMBOL_GPL(…); /** * adxl_decode - ask BIOS to decode a system address to memory address * @addr: the address to decode * @component_values: pointer to array of values for each component * Returns 0 on success, negative error code otherwise * * The index of each value returned in the array matches the index of * each component name returned by adxl_get_component_names(). * Components that are not defined for this address translation (e.g. * mirror channel number for a non-mirrored address) are set to ~0ull. */ int adxl_decode(u64 addr, u64 component_values[]) { … } EXPORT_SYMBOL_GPL(…); static int __init adxl_init(void) { … } subsys_initcall(adxl_init);
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