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372 lines
9.3 KiB
372 lines
9.3 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
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/****************************************************************************** |
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* |
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* Module Name: dscontrol - Support for execution control opcodes - |
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* if/else/while/return |
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* |
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* Copyright (C) 2000 - 2021, 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 "amlcode.h" |
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#include "acdispat.h" |
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#include "acinterp.h" |
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#include "acdebug.h" |
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#define _COMPONENT ACPI_DISPATCHER |
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ACPI_MODULE_NAME("dscontrol") |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ds_exec_begin_control_op |
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* |
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* PARAMETERS: walk_list - The list that owns the walk stack |
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* op - The control Op |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Handles all control ops encountered during control method |
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* execution. |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ds_exec_begin_control_op(struct acpi_walk_state *walk_state, |
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union acpi_parse_object *op) |
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{ |
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acpi_status status = AE_OK; |
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union acpi_generic_state *control_state; |
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ACPI_FUNCTION_NAME(ds_exec_begin_control_op); |
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p Opcode=%2.2X State=%p\n", |
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op, op->common.aml_opcode, walk_state)); |
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switch (op->common.aml_opcode) { |
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case AML_WHILE_OP: |
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/* |
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* If this is an additional iteration of a while loop, continue. |
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* There is no need to allocate a new control state. |
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*/ |
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if (walk_state->control_state) { |
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if (walk_state->control_state->control. |
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aml_predicate_start == |
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(walk_state->parser_state.aml - 1)) { |
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/* Reset the state to start-of-loop */ |
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walk_state->control_state->common.state = |
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ACPI_CONTROL_CONDITIONAL_EXECUTING; |
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break; |
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} |
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} |
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ACPI_FALLTHROUGH; |
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case AML_IF_OP: |
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/* |
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* IF/WHILE: Create a new control state to manage these |
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* constructs. We need to manage these as a stack, in order |
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* to handle nesting. |
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*/ |
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control_state = acpi_ut_create_control_state(); |
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if (!control_state) { |
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status = AE_NO_MEMORY; |
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break; |
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} |
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/* |
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* Save a pointer to the predicate for multiple executions |
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* of a loop |
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*/ |
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control_state->control.aml_predicate_start = |
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walk_state->parser_state.aml - 1; |
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control_state->control.package_end = |
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walk_state->parser_state.pkg_end; |
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control_state->control.opcode = op->common.aml_opcode; |
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control_state->control.loop_timeout = acpi_os_get_timer() + |
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((u64)acpi_gbl_max_loop_iterations * ACPI_100NSEC_PER_SEC); |
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/* Push the control state on this walk's control stack */ |
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acpi_ut_push_generic_state(&walk_state->control_state, |
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control_state); |
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break; |
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case AML_ELSE_OP: |
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/* Predicate is in the state object */ |
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/* If predicate is true, the IF was executed, ignore ELSE part */ |
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if (walk_state->last_predicate) { |
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status = AE_CTRL_TRUE; |
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} |
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break; |
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case AML_RETURN_OP: |
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break; |
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default: |
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break; |
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} |
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return (status); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ds_exec_end_control_op |
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* |
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* PARAMETERS: walk_list - The list that owns the walk stack |
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* op - The control Op |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Handles all control ops encountered during control method |
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* execution. |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ds_exec_end_control_op(struct acpi_walk_state *walk_state, |
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union acpi_parse_object *op) |
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{ |
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acpi_status status = AE_OK; |
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union acpi_generic_state *control_state; |
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ACPI_FUNCTION_NAME(ds_exec_end_control_op); |
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switch (op->common.aml_opcode) { |
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case AML_IF_OP: |
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[IF_OP] Op=%p\n", op)); |
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/* |
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* Save the result of the predicate in case there is an |
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* ELSE to come |
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*/ |
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walk_state->last_predicate = |
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(u8)walk_state->control_state->common.value; |
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/* |
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* Pop the control state that was created at the start |
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* of the IF and free it |
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*/ |
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control_state = |
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acpi_ut_pop_generic_state(&walk_state->control_state); |
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acpi_ut_delete_generic_state(control_state); |
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break; |
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case AML_ELSE_OP: |
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break; |
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case AML_WHILE_OP: |
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "[WHILE_OP] Op=%p\n", op)); |
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control_state = walk_state->control_state; |
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if (control_state->common.value) { |
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/* Predicate was true, the body of the loop was just executed */ |
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/* |
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* This infinite loop detection mechanism allows the interpreter |
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* to escape possibly infinite loops. This can occur in poorly |
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* written AML when the hardware does not respond within a while |
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* loop and the loop does not implement a timeout. |
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*/ |
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if (ACPI_TIME_AFTER(acpi_os_get_timer(), |
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control_state->control. |
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loop_timeout)) { |
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status = AE_AML_LOOP_TIMEOUT; |
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break; |
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} |
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/* |
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* Go back and evaluate the predicate and maybe execute the loop |
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* another time |
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*/ |
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status = AE_CTRL_PENDING; |
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walk_state->aml_last_while = |
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control_state->control.aml_predicate_start; |
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break; |
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} |
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/* Predicate was false, terminate this while loop */ |
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
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"[WHILE_OP] termination! Op=%p\n", op)); |
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/* Pop this control state and free it */ |
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control_state = |
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acpi_ut_pop_generic_state(&walk_state->control_state); |
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acpi_ut_delete_generic_state(control_state); |
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break; |
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case AML_RETURN_OP: |
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
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"[RETURN_OP] Op=%p Arg=%p\n", op, |
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op->common.value.arg)); |
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/* |
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* One optional operand -- the return value |
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* It can be either an immediate operand or a result that |
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* has been bubbled up the tree |
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*/ |
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if (op->common.value.arg) { |
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/* Since we have a real Return(), delete any implicit return */ |
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acpi_ds_clear_implicit_return(walk_state); |
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/* Return statement has an immediate operand */ |
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status = |
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acpi_ds_create_operands(walk_state, |
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op->common.value.arg); |
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if (ACPI_FAILURE(status)) { |
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return (status); |
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} |
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/* |
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* If value being returned is a Reference (such as |
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* an arg or local), resolve it now because it may |
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* cease to exist at the end of the method. |
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*/ |
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status = |
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acpi_ex_resolve_to_value(&walk_state->operands[0], |
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walk_state); |
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if (ACPI_FAILURE(status)) { |
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return (status); |
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} |
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/* |
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* Get the return value and save as the last result |
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* value. This is the only place where walk_state->return_desc |
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* is set to anything other than zero! |
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*/ |
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walk_state->return_desc = walk_state->operands[0]; |
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} else if (walk_state->result_count) { |
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/* Since we have a real Return(), delete any implicit return */ |
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acpi_ds_clear_implicit_return(walk_state); |
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/* |
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* The return value has come from a previous calculation. |
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* |
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* If value being returned is a Reference (such as |
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* an arg or local), resolve it now because it may |
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* cease to exist at the end of the method. |
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* |
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* Allow references created by the Index operator to return |
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* unchanged. |
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*/ |
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if ((ACPI_GET_DESCRIPTOR_TYPE |
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(walk_state->results->results.obj_desc[0]) == |
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ACPI_DESC_TYPE_OPERAND) |
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&& ((walk_state->results->results.obj_desc[0])-> |
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common.type == ACPI_TYPE_LOCAL_REFERENCE) |
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&& ((walk_state->results->results.obj_desc[0])-> |
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reference.class != ACPI_REFCLASS_INDEX)) { |
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status = |
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acpi_ex_resolve_to_value(&walk_state-> |
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results->results. |
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obj_desc[0], |
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walk_state); |
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if (ACPI_FAILURE(status)) { |
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return (status); |
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} |
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} |
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walk_state->return_desc = |
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walk_state->results->results.obj_desc[0]; |
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} else { |
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/* No return operand */ |
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if (walk_state->num_operands) { |
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acpi_ut_remove_reference(walk_state-> |
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operands[0]); |
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} |
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walk_state->operands[0] = NULL; |
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walk_state->num_operands = 0; |
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walk_state->return_desc = NULL; |
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} |
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ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, |
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"Completed RETURN_OP State=%p, RetVal=%p\n", |
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walk_state, walk_state->return_desc)); |
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/* End the control method execution right now */ |
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status = AE_CTRL_TERMINATE; |
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break; |
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case AML_NOOP_OP: |
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/* Just do nothing! */ |
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break; |
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case AML_BREAKPOINT_OP: |
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acpi_db_signal_break_point(walk_state); |
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/* Call to the OSL in case OS wants a piece of the action */ |
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status = acpi_os_signal(ACPI_SIGNAL_BREAKPOINT, |
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"Executed AML Breakpoint opcode"); |
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break; |
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case AML_BREAK_OP: |
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case AML_CONTINUE_OP: /* ACPI 2.0 */ |
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/* Pop and delete control states until we find a while */ |
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while (walk_state->control_state && |
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(walk_state->control_state->control.opcode != |
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AML_WHILE_OP)) { |
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control_state = |
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acpi_ut_pop_generic_state(&walk_state-> |
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control_state); |
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acpi_ut_delete_generic_state(control_state); |
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} |
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/* No while found? */ |
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if (!walk_state->control_state) { |
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return (AE_AML_NO_WHILE); |
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} |
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/* Was: walk_state->aml_last_while = walk_state->control_state->Control.aml_predicate_start; */ |
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walk_state->aml_last_while = |
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walk_state->control_state->control.package_end; |
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/* Return status depending on opcode */ |
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if (op->common.aml_opcode == AML_BREAK_OP) { |
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status = AE_CTRL_BREAK; |
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} else { |
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status = AE_CTRL_CONTINUE; |
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} |
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break; |
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default: |
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ACPI_ERROR((AE_INFO, "Unknown control opcode=0x%X Op=%p", |
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op->common.aml_opcode, op)); |
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status = AE_AML_BAD_OPCODE; |
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break; |
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} |
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return (status); |
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}
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