516 lines
14 KiB
C
516 lines
14 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes)
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*
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* Copyright (C) 2000 - 2018, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acinterp.h"
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#include "acnamesp.h"
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#include "actables.h"
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#include "acdispat.h"
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#include "acevents.h"
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#include "amlcode.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exconfig")
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/* Local prototypes */
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static acpi_status
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acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle);
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static acpi_status
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acpi_ex_region_read(union acpi_operand_object *obj_desc,
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u32 length, u8 *buffer);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_add_table
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*
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* PARAMETERS: table - Pointer to raw table
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* parent_node - Where to load the table (scope)
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* ddb_handle - Where to return the table handle.
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*
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* RETURN: Status
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*
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* DESCRIPTION: Common function to Install and Load an ACPI table with a
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* returned table handle.
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle)
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{
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union acpi_operand_object *obj_desc;
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ACPI_FUNCTION_TRACE(ex_add_table);
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/* Create an object to be the table handle */
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obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
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if (!obj_desc) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Init the table handle */
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obj_desc->common.flags |= AOPOBJ_DATA_VALID;
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obj_desc->reference.class = ACPI_REFCLASS_TABLE;
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obj_desc->reference.value = table_index;
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*ddb_handle = obj_desc;
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_load_table_op
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*
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* PARAMETERS: walk_state - Current state with operands
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* return_desc - Where to store the return object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Load an ACPI table from the RSDT/XSDT
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*
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******************************************************************************/
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acpi_status
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acpi_ex_load_table_op(struct acpi_walk_state *walk_state,
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union acpi_operand_object **return_desc)
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{
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acpi_status status;
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union acpi_operand_object **operand = &walk_state->operands[0];
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struct acpi_namespace_node *parent_node;
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struct acpi_namespace_node *start_node;
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struct acpi_namespace_node *parameter_node = NULL;
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union acpi_operand_object *ddb_handle;
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u32 table_index;
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ACPI_FUNCTION_TRACE(ex_load_table_op);
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/* Find the ACPI table in the RSDT/XSDT */
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acpi_ex_exit_interpreter();
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status = acpi_tb_find_table(operand[0]->string.pointer,
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operand[1]->string.pointer,
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operand[2]->string.pointer, &table_index);
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acpi_ex_enter_interpreter();
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if (ACPI_FAILURE(status)) {
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if (status != AE_NOT_FOUND) {
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return_ACPI_STATUS(status);
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}
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/* Table not found, return an Integer=0 and AE_OK */
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ddb_handle = acpi_ut_create_integer_object((u64) 0);
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if (!ddb_handle) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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*return_desc = ddb_handle;
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return_ACPI_STATUS(AE_OK);
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}
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/* Default nodes */
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start_node = walk_state->scope_info->scope.node;
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parent_node = acpi_gbl_root_node;
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/* root_path (optional parameter) */
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if (operand[3]->string.length > 0) {
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/*
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* Find the node referenced by the root_path_string. This is the
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* location within the namespace where the table will be loaded.
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*/
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status = acpi_ns_get_node_unlocked(start_node,
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operand[3]->string.pointer,
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ACPI_NS_SEARCH_PARENT,
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&parent_node);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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/* parameter_path (optional parameter) */
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if (operand[4]->string.length > 0) {
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if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) &&
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(operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) {
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/*
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* Path is not absolute, so it will be relative to the node
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* referenced by the root_path_string (or the NS root if omitted)
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*/
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start_node = parent_node;
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}
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/* Find the node referenced by the parameter_path_string */
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status = acpi_ns_get_node_unlocked(start_node,
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operand[4]->string.pointer,
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ACPI_NS_SEARCH_PARENT,
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¶meter_node);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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/* Load the table into the namespace */
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ACPI_INFO(("Dynamic OEM Table Load:"));
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acpi_ex_exit_interpreter();
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status = acpi_tb_load_table(table_index, parent_node);
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acpi_ex_enter_interpreter();
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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status = acpi_ex_add_table(table_index, &ddb_handle);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Parameter Data (optional) */
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if (parameter_node) {
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/* Store the parameter data into the optional parameter object */
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status = acpi_ex_store(operand[5],
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ACPI_CAST_PTR(union acpi_operand_object,
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parameter_node),
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walk_state);
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if (ACPI_FAILURE(status)) {
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(void)acpi_ex_unload_table(ddb_handle);
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acpi_ut_remove_reference(ddb_handle);
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return_ACPI_STATUS(status);
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}
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}
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*return_desc = ddb_handle;
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_region_read
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*
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* PARAMETERS: obj_desc - Region descriptor
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* length - Number of bytes to read
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* buffer - Pointer to where to put the data
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read data from an operation region. The read starts from the
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* beginning of the region.
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*
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******************************************************************************/
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static acpi_status
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acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer)
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{
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acpi_status status;
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u64 value;
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u32 region_offset = 0;
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u32 i;
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/* Bytewise reads */
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for (i = 0; i < length; i++) {
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status =
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acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ,
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region_offset, 8, &value);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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*buffer = (u8)value;
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buffer++;
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region_offset++;
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_load_op
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*
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* PARAMETERS: obj_desc - Region or Buffer/Field where the table will be
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* obtained
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* target - Where a handle to the table will be stored
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* walk_state - Current state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Load an ACPI table from a field or operation region
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*
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* NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer
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* objects before this code is reached.
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*
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* If source is an operation region, it must refer to system_memory, as
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* per the ACPI specification.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_load_op(union acpi_operand_object *obj_desc,
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union acpi_operand_object *target,
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struct acpi_walk_state *walk_state)
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{
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union acpi_operand_object *ddb_handle;
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struct acpi_table_header *table_header;
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struct acpi_table_header *table;
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u32 table_index;
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acpi_status status;
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u32 length;
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ACPI_FUNCTION_TRACE(ex_load_op);
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/* Source Object can be either an op_region or a Buffer/Field */
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switch (obj_desc->common.type) {
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case ACPI_TYPE_REGION:
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Load table from Region %p\n", obj_desc));
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/* Region must be system_memory (from ACPI spec) */
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if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) {
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/*
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* If the Region Address and Length have not been previously
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* evaluated, evaluate them now and save the results.
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*/
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if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
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status = acpi_ds_get_region_arguments(obj_desc);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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/* Get the table header first so we can get the table length */
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table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header));
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if (!table_header) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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status =
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acpi_ex_region_read(obj_desc,
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sizeof(struct acpi_table_header),
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ACPI_CAST_PTR(u8, table_header));
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length = table_header->length;
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ACPI_FREE(table_header);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Must have at least an ACPI table header */
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if (length < sizeof(struct acpi_table_header)) {
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return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
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}
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/*
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* The original implementation simply mapped the table, with no copy.
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* However, the memory region is not guaranteed to remain stable and
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* we must copy the table to a local buffer. For example, the memory
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* region is corrupted after suspend on some machines. Dynamically
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* loaded tables are usually small, so this overhead is minimal.
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*
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* The latest implementation (5/2009) does not use a mapping at all.
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* We use the low-level operation region interface to read the table
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* instead of the obvious optimization of using a direct mapping.
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* This maintains a consistent use of operation regions across the
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* entire subsystem. This is important if additional processing must
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* be performed in the (possibly user-installed) operation region
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* handler. For example, acpi_exec and ASLTS depend on this.
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*/
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/* Allocate a buffer for the table */
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table = ACPI_ALLOCATE(length);
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if (!table) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Read the entire table */
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status = acpi_ex_region_read(obj_desc, length,
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ACPI_CAST_PTR(u8, table));
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if (ACPI_FAILURE(status)) {
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ACPI_FREE(table);
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return_ACPI_STATUS(status);
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}
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break;
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case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Load table from Buffer or Field %p\n",
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obj_desc));
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/* Must have at least an ACPI table header */
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if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) {
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return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
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}
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/* Get the actual table length from the table header */
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table_header =
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ACPI_CAST_PTR(struct acpi_table_header,
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obj_desc->buffer.pointer);
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length = table_header->length;
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/* Table cannot extend beyond the buffer */
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if (length > obj_desc->buffer.length) {
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return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
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}
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if (length < sizeof(struct acpi_table_header)) {
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return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
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}
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/*
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* Copy the table from the buffer because the buffer could be
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* modified or even deleted in the future
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*/
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table = ACPI_ALLOCATE(length);
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if (!table) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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memcpy(table, table_header, length);
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break;
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default:
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/* Install the new table into the local data structures */
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ACPI_INFO(("Dynamic OEM Table Load:"));
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acpi_ex_exit_interpreter();
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status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
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ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
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TRUE, &table_index);
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acpi_ex_enter_interpreter();
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if (ACPI_FAILURE(status)) {
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/* Delete allocated table buffer */
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ACPI_FREE(table);
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return_ACPI_STATUS(status);
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}
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/*
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* Add the table to the namespace.
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*
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* Note: Load the table objects relative to the root of the namespace.
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* This appears to go against the ACPI specification, but we do it for
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* compatibility with other ACPI implementations.
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*/
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status = acpi_ex_add_table(table_index, &ddb_handle);
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if (ACPI_FAILURE(status)) {
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/* On error, table_ptr was deallocated above */
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return_ACPI_STATUS(status);
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}
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/* Store the ddb_handle into the Target operand */
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status = acpi_ex_store(ddb_handle, target, walk_state);
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if (ACPI_FAILURE(status)) {
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(void)acpi_ex_unload_table(ddb_handle);
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/* table_ptr was deallocated above */
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acpi_ut_remove_reference(ddb_handle);
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return_ACPI_STATUS(status);
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}
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/* Remove the reference by added by acpi_ex_store above */
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acpi_ut_remove_reference(ddb_handle);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_unload_table
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*
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* PARAMETERS: ddb_handle - Handle to a previously loaded table
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*
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* RETURN: Status
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*
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* DESCRIPTION: Unload an ACPI table
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*
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******************************************************************************/
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acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle)
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{
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acpi_status status = AE_OK;
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union acpi_operand_object *table_desc = ddb_handle;
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u32 table_index;
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ACPI_FUNCTION_TRACE(ex_unload_table);
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/*
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* Temporarily emit a warning so that the ASL for the machine can be
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* hopefully obtained. This is to say that the Unload() operator is
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* extremely rare if not completely unused.
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*/
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ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table"));
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/*
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* Validate the handle
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* Although the handle is partially validated in acpi_ex_reconfiguration()
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* when it calls acpi_ex_resolve_operands(), the handle is more completely
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* validated here.
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*
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* Handle must be a valid operand object of type reference. Also, the
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* ddb_handle must still be marked valid (table has not been previously
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* unloaded)
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*/
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if ((!ddb_handle) ||
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(ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) ||
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(ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) ||
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(!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) {
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/* Get the table index from the ddb_handle */
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table_index = table_desc->reference.value;
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/*
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* Release the interpreter lock so that the table lock won't have
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* strict order requirement against it.
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*/
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acpi_ex_exit_interpreter();
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status = acpi_tb_unload_table(table_index);
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acpi_ex_enter_interpreter();
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/*
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* Invalidate the handle. We do this because the handle may be stored
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* in a named object and may not be actually deleted until much later.
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*/
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if (ACPI_SUCCESS(status)) {
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ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID;
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}
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return_ACPI_STATUS(status);
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}
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