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561 lines
14 KiB
561 lines
14 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: psloop - Main AML parse loop |
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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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|
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/* |
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* Parse the AML and build an operation tree as most interpreters, (such as |
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* Perl) do. Parsing is done by hand rather than with a YACC generated parser |
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* to tightly constrain stack and dynamic memory usage. Parsing is kept |
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* flexible and the code fairly compact by parsing based on a list of AML |
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* opcode templates in aml_op_info[]. |
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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 "acparser.h" |
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#include "acdispat.h" |
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#include "amlcode.h" |
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#include "acconvert.h" |
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#include "acnamesp.h" |
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#define _COMPONENT ACPI_PARSER |
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ACPI_MODULE_NAME("psloop") |
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|
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/* Local prototypes */ |
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static acpi_status |
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acpi_ps_get_arguments(struct acpi_walk_state *walk_state, |
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u8 * aml_op_start, union acpi_parse_object *op); |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ps_get_arguments |
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* |
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* PARAMETERS: walk_state - Current state |
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* aml_op_start - Op start in AML |
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* op - Current Op |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Get arguments for passed Op. |
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* |
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******************************************************************************/ |
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static acpi_status |
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acpi_ps_get_arguments(struct acpi_walk_state *walk_state, |
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u8 * aml_op_start, union acpi_parse_object *op) |
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{ |
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acpi_status status = AE_OK; |
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union acpi_parse_object *arg = NULL; |
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ACPI_FUNCTION_TRACE_PTR(ps_get_arguments, walk_state); |
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
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"Get arguments for opcode [%s]\n", |
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op->common.aml_op_name)); |
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switch (op->common.aml_opcode) { |
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case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ |
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case AML_WORD_OP: /* AML_WORDDATA_ARG */ |
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case AML_DWORD_OP: /* AML_DWORDATA_ARG */ |
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case AML_QWORD_OP: /* AML_QWORDATA_ARG */ |
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case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */ |
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/* Fill in constant or string argument directly */ |
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acpi_ps_get_next_simple_arg(&(walk_state->parser_state), |
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GET_CURRENT_ARG_TYPE(walk_state-> |
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arg_types), |
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op); |
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break; |
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case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */ |
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status = acpi_ps_get_next_namepath(walk_state, |
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&(walk_state->parser_state), |
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op, |
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ACPI_POSSIBLE_METHOD_CALL); |
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if (ACPI_FAILURE(status)) { |
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return_ACPI_STATUS(status); |
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} |
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walk_state->arg_types = 0; |
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break; |
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default: |
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/* |
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* Op is not a constant or string, append each argument to the Op |
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*/ |
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while (GET_CURRENT_ARG_TYPE(walk_state->arg_types) && |
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!walk_state->arg_count) { |
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walk_state->aml = walk_state->parser_state.aml; |
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switch (op->common.aml_opcode) { |
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case AML_METHOD_OP: |
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case AML_BUFFER_OP: |
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case AML_PACKAGE_OP: |
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case AML_VARIABLE_PACKAGE_OP: |
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case AML_WHILE_OP: |
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break; |
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default: |
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ASL_CV_CAPTURE_COMMENTS(walk_state); |
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break; |
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} |
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status = |
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acpi_ps_get_next_arg(walk_state, |
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&(walk_state->parser_state), |
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GET_CURRENT_ARG_TYPE |
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(walk_state->arg_types), &arg); |
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if (ACPI_FAILURE(status)) { |
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return_ACPI_STATUS(status); |
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} |
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if (arg) { |
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acpi_ps_append_arg(op, arg); |
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} |
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INCREMENT_ARG_LIST(walk_state->arg_types); |
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} |
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
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"Final argument count: %8.8X pass %u\n", |
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walk_state->arg_count, |
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walk_state->pass_number)); |
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/* Special processing for certain opcodes */ |
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switch (op->common.aml_opcode) { |
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case AML_METHOD_OP: |
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/* |
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* Skip parsing of control method because we don't have enough |
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* info in the first pass to parse it correctly. |
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* |
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* Save the length and address of the body |
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*/ |
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op->named.data = walk_state->parser_state.aml; |
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op->named.length = (u32) |
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(walk_state->parser_state.pkg_end - |
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walk_state->parser_state.aml); |
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/* Skip body of method */ |
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walk_state->parser_state.aml = |
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walk_state->parser_state.pkg_end; |
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walk_state->arg_count = 0; |
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break; |
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case AML_BUFFER_OP: |
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case AML_PACKAGE_OP: |
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case AML_VARIABLE_PACKAGE_OP: |
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if ((op->common.parent) && |
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(op->common.parent->common.aml_opcode == |
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AML_NAME_OP) |
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&& (walk_state->pass_number <= |
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ACPI_IMODE_LOAD_PASS2)) { |
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
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"Setup Package/Buffer: Pass %u, AML Ptr: %p\n", |
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walk_state->pass_number, |
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aml_op_start)); |
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/* |
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* Skip parsing of Buffers and Packages because we don't have |
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* enough info in the first pass to parse them correctly. |
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*/ |
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op->named.data = aml_op_start; |
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op->named.length = (u32) |
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(walk_state->parser_state.pkg_end - |
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aml_op_start); |
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/* Skip body */ |
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walk_state->parser_state.aml = |
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walk_state->parser_state.pkg_end; |
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walk_state->arg_count = 0; |
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} |
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break; |
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case AML_WHILE_OP: |
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if (walk_state->control_state) { |
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walk_state->control_state->control.package_end = |
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walk_state->parser_state.pkg_end; |
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} |
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break; |
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default: |
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/* No action for all other opcodes */ |
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break; |
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} |
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break; |
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} |
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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_ps_parse_loop |
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* |
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* PARAMETERS: walk_state - Current state |
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* |
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* RETURN: Status |
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* |
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* DESCRIPTION: Parse AML (pointed to by the current parser state) and return |
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* a tree of ops. |
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* |
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******************************************************************************/ |
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acpi_status acpi_ps_parse_loop(struct acpi_walk_state *walk_state) |
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{ |
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acpi_status status = AE_OK; |
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union acpi_parse_object *op = NULL; /* current op */ |
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struct acpi_parse_state *parser_state; |
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u8 *aml_op_start = NULL; |
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u8 opcode_length; |
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ACPI_FUNCTION_TRACE_PTR(ps_parse_loop, walk_state); |
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if (walk_state->descending_callback == NULL) { |
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return_ACPI_STATUS(AE_BAD_PARAMETER); |
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} |
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parser_state = &walk_state->parser_state; |
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walk_state->arg_types = 0; |
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#ifndef ACPI_CONSTANT_EVAL_ONLY |
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if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) { |
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/* We are restarting a preempted control method */ |
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if (acpi_ps_has_completed_scope(parser_state)) { |
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/* |
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* We must check if a predicate to an IF or WHILE statement |
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* was just completed |
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*/ |
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if ((parser_state->scope->parse_scope.op) && |
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((parser_state->scope->parse_scope.op->common. |
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aml_opcode == AML_IF_OP) |
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|| (parser_state->scope->parse_scope.op->common. |
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aml_opcode == AML_WHILE_OP)) |
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&& (walk_state->control_state) |
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&& (walk_state->control_state->common.state == |
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ACPI_CONTROL_PREDICATE_EXECUTING)) { |
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/* |
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* A predicate was just completed, get the value of the |
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* predicate and branch based on that value |
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*/ |
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walk_state->op = NULL; |
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status = |
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acpi_ds_get_predicate_value(walk_state, |
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ACPI_TO_POINTER |
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(TRUE)); |
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if (ACPI_FAILURE(status) |
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&& !ACPI_CNTL_EXCEPTION(status)) { |
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if (status == AE_AML_NO_RETURN_VALUE) { |
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ACPI_EXCEPTION((AE_INFO, status, |
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"Invoked method did not return a value")); |
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} |
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ACPI_EXCEPTION((AE_INFO, status, |
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"GetPredicate Failed")); |
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return_ACPI_STATUS(status); |
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} |
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status = |
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acpi_ps_next_parse_state(walk_state, op, |
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status); |
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} |
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acpi_ps_pop_scope(parser_state, &op, |
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&walk_state->arg_types, |
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&walk_state->arg_count); |
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
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"Popped scope, Op=%p\n", op)); |
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} else if (walk_state->prev_op) { |
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/* We were in the middle of an op */ |
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op = walk_state->prev_op; |
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walk_state->arg_types = walk_state->prev_arg_types; |
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} |
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} |
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#endif |
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/* Iterative parsing loop, while there is more AML to process: */ |
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while ((parser_state->aml < parser_state->aml_end) || (op)) { |
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ASL_CV_CAPTURE_COMMENTS(walk_state); |
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aml_op_start = parser_state->aml; |
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if (!op) { |
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status = |
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acpi_ps_create_op(walk_state, aml_op_start, &op); |
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if (ACPI_FAILURE(status)) { |
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/* |
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* ACPI_PARSE_MODULE_LEVEL means that we are loading a table by |
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* executing it as a control method. However, if we encounter |
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* an error while loading the table, we need to keep trying to |
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* load the table rather than aborting the table load. Set the |
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* status to AE_OK to proceed with the table load. |
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*/ |
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if ((walk_state-> |
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parse_flags & ACPI_PARSE_MODULE_LEVEL) |
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&& ((status == AE_ALREADY_EXISTS) |
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|| (status == AE_NOT_FOUND))) { |
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status = AE_OK; |
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} |
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if (status == AE_CTRL_PARSE_CONTINUE) { |
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continue; |
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} |
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if (status == AE_CTRL_PARSE_PENDING) { |
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status = AE_OK; |
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} |
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if (status == AE_CTRL_TERMINATE) { |
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return_ACPI_STATUS(status); |
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} |
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status = |
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acpi_ps_complete_op(walk_state, &op, |
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status); |
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if (ACPI_FAILURE(status)) { |
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return_ACPI_STATUS(status); |
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} |
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if (acpi_ns_opens_scope |
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(acpi_ps_get_opcode_info |
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(walk_state->opcode)->object_type)) { |
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/* |
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* If the scope/device op fails to parse, skip the body of |
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* the scope op because the parse failure indicates that |
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* the device may not exist. |
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*/ |
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ACPI_INFO(("Skipping parse of AML opcode: %s (0x%4.4X)", acpi_ps_get_opcode_name(walk_state->opcode), walk_state->opcode)); |
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/* |
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* Determine the opcode length before skipping the opcode. |
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* An opcode can be 1 byte or 2 bytes in length. |
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*/ |
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opcode_length = 1; |
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if ((walk_state->opcode & 0xFF00) == |
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AML_EXTENDED_OPCODE) { |
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opcode_length = 2; |
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} |
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walk_state->parser_state.aml = |
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walk_state->aml + opcode_length; |
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walk_state->parser_state.aml = |
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acpi_ps_get_next_package_end |
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(&walk_state->parser_state); |
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walk_state->aml = |
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walk_state->parser_state.aml; |
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} |
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continue; |
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} |
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acpi_ex_start_trace_opcode(op, walk_state); |
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} |
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/* |
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* Start arg_count at zero because we don't know if there are |
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* any args yet |
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*/ |
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walk_state->arg_count = 0; |
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switch (op->common.aml_opcode) { |
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case AML_BYTE_OP: |
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case AML_WORD_OP: |
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case AML_DWORD_OP: |
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case AML_QWORD_OP: |
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break; |
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default: |
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ASL_CV_CAPTURE_COMMENTS(walk_state); |
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break; |
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} |
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/* Are there any arguments that must be processed? */ |
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if (walk_state->arg_types) { |
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/* Get arguments */ |
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status = |
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acpi_ps_get_arguments(walk_state, aml_op_start, op); |
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if (ACPI_FAILURE(status)) { |
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status = |
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acpi_ps_complete_op(walk_state, &op, |
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status); |
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if (ACPI_FAILURE(status)) { |
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return_ACPI_STATUS(status); |
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} |
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if ((walk_state->control_state) && |
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((walk_state->control_state->control. |
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opcode == AML_IF_OP) |
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|| (walk_state->control_state->control. |
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opcode == AML_WHILE_OP))) { |
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/* |
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* If the if/while op fails to parse, we will skip parsing |
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* the body of the op. |
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*/ |
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parser_state->aml = |
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walk_state->control_state->control. |
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aml_predicate_start + 1; |
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parser_state->aml = |
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acpi_ps_get_next_package_end |
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(parser_state); |
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walk_state->aml = parser_state->aml; |
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ACPI_ERROR((AE_INFO, |
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"Skipping While/If block")); |
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if (*walk_state->aml == AML_ELSE_OP) { |
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ACPI_ERROR((AE_INFO, |
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"Skipping Else block")); |
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walk_state->parser_state.aml = |
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walk_state->aml + 1; |
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walk_state->parser_state.aml = |
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acpi_ps_get_next_package_end |
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(parser_state); |
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walk_state->aml = |
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parser_state->aml; |
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} |
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ACPI_FREE(acpi_ut_pop_generic_state |
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(&walk_state->control_state)); |
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} |
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op = NULL; |
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continue; |
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} |
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} |
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/* Check for arguments that need to be processed */ |
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
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"Parseloop: argument count: %8.8X\n", |
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walk_state->arg_count)); |
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if (walk_state->arg_count) { |
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/* |
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* There are arguments (complex ones), push Op and |
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* prepare for argument |
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*/ |
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status = acpi_ps_push_scope(parser_state, op, |
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walk_state->arg_types, |
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walk_state->arg_count); |
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if (ACPI_FAILURE(status)) { |
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status = |
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acpi_ps_complete_op(walk_state, &op, |
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status); |
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if (ACPI_FAILURE(status)) { |
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return_ACPI_STATUS(status); |
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} |
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continue; |
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} |
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op = NULL; |
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continue; |
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} |
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/* |
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* All arguments have been processed -- Op is complete, |
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* prepare for next |
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*/ |
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walk_state->op_info = |
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acpi_ps_get_opcode_info(op->common.aml_opcode); |
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if (walk_state->op_info->flags & AML_NAMED) { |
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if (op->common.aml_opcode == AML_REGION_OP || |
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op->common.aml_opcode == AML_DATA_REGION_OP) { |
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/* |
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* Skip parsing of control method or opregion body, |
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* because we don't have enough info in the first pass |
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* to parse them correctly. |
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* |
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* Completed parsing an op_region declaration, we now |
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* know the length. |
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*/ |
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op->named.length = |
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(u32) (parser_state->aml - op->named.data); |
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} |
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} |
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if (walk_state->op_info->flags & AML_CREATE) { |
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/* |
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* Backup to beginning of create_XXXfield declaration (1 for |
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* Opcode) |
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* |
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* body_length is unknown until we parse the body |
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*/ |
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op->named.length = |
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(u32) (parser_state->aml - op->named.data); |
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} |
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if (op->common.aml_opcode == AML_BANK_FIELD_OP) { |
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/* |
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* Backup to beginning of bank_field declaration |
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* |
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* body_length is unknown until we parse the body |
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*/ |
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op->named.length = |
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(u32) (parser_state->aml - op->named.data); |
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} |
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|
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/* This op complete, notify the dispatcher */ |
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if (walk_state->ascending_callback != NULL) { |
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walk_state->op = op; |
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walk_state->opcode = op->common.aml_opcode; |
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status = walk_state->ascending_callback(walk_state); |
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status = |
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acpi_ps_next_parse_state(walk_state, op, status); |
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if (status == AE_CTRL_PENDING) { |
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status = AE_OK; |
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} else |
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if ((walk_state-> |
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parse_flags & ACPI_PARSE_MODULE_LEVEL) |
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&& (ACPI_AML_EXCEPTION(status) |
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|| status == AE_ALREADY_EXISTS |
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|| status == AE_NOT_FOUND)) { |
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/* |
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* ACPI_PARSE_MODULE_LEVEL flag means that we |
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* are currently loading a table by executing |
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* it as a control method. However, if we |
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* encounter an error while loading the table, |
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* we need to keep trying to load the table |
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* rather than aborting the table load (setting |
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* the status to AE_OK continues the table |
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* load). If we get a failure at this point, it |
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* means that the dispatcher got an error while |
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* trying to execute the Op. |
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*/ |
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status = AE_OK; |
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} |
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} |
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status = acpi_ps_complete_op(walk_state, &op, status); |
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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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} /* while parser_state->Aml */ |
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status = acpi_ps_complete_final_op(walk_state, op, status); |
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return_ACPI_STATUS(status); |
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}
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