/****************************************************************************** * * Module Name: psparse - Parser top level AML parse routines * *****************************************************************************/ /* * Copyright (C) 2000 - 2004, R. Byron Moore * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ /* * Parse the AML and build an operation tree as most interpreters, * like Perl, do. Parsing is done by hand rather than with a YACC * generated parser to tightly constrain stack and dynamic memory * usage. At the same time, parsing is kept flexible and the code * fairly compact by parsing based on a list of AML opcode * templates in aml_op_info[] */ #include #include #include #include #include #include #define _COMPONENT ACPI_PARSER ACPI_MODULE_NAME ("psparse") static u32 acpi_gbl_depth = 0; /******************************************************************************* * * FUNCTION: acpi_ps_get_opcode_size * * PARAMETERS: Opcode - An AML opcode * * RETURN: Size of the opcode, in bytes (1 or 2) * * DESCRIPTION: Get the size of the current opcode. * ******************************************************************************/ u32 acpi_ps_get_opcode_size ( u32 opcode) { /* Extended (2-byte) opcode if > 255 */ if (opcode > 0x00FF) { return (2); } /* Otherwise, just a single byte opcode */ return (1); } /******************************************************************************* * * FUNCTION: acpi_ps_peek_opcode * * PARAMETERS: parser_state - A parser state object * * RETURN: Status * * DESCRIPTION: Get next AML opcode (without incrementing AML pointer) * ******************************************************************************/ u16 acpi_ps_peek_opcode ( struct acpi_parse_state *parser_state) { u8 *aml; u16 opcode; aml = parser_state->aml; opcode = (u16) ACPI_GET8 (aml); if (opcode == AML_EXTOP) { /* Extended opcode */ aml++; opcode = (u16) ((opcode << 8) | ACPI_GET8 (aml)); } return (opcode); } /******************************************************************************* * * FUNCTION: acpi_ps_complete_this_op * * PARAMETERS: walk_state - Current State * Op - Op to complete * * RETURN: None. * * DESCRIPTION: Perform any cleanup at the completion of an Op. * ******************************************************************************/ void acpi_ps_complete_this_op ( struct acpi_walk_state *walk_state, union acpi_parse_object *op) { union acpi_parse_object *prev; union acpi_parse_object *next; const struct acpi_opcode_info *parent_info; union acpi_parse_object *replacement_op = NULL; ACPI_FUNCTION_TRACE_PTR ("ps_complete_this_op", op); /* Check for null Op, can happen if AML code is corrupt */ if (!op) { return_VOID; } /* Delete this op and the subtree below it if asked to */ if (((walk_state->parse_flags & ACPI_PARSE_TREE_MASK) == ACPI_PARSE_DELETE_TREE) && (walk_state->op_info->class != AML_CLASS_ARGUMENT)) { /* Make sure that we only delete this subtree */ if (op->common.parent) { /* * Check if we need to replace the operator and its subtree * with a return value op (placeholder op) */ parent_info = acpi_ps_get_opcode_info (op->common.parent->common.aml_opcode); switch (parent_info->class) { case AML_CLASS_CONTROL: break; case AML_CLASS_CREATE: /* * These opcodes contain term_arg operands. The current * op must be replaced by a placeholder return op */ replacement_op = acpi_ps_alloc_op (AML_INT_RETURN_VALUE_OP); if (!replacement_op) { return_VOID; } break; case AML_CLASS_NAMED_OBJECT: /* * These opcodes contain term_arg operands. The current * op must be replaced by a placeholder return op */ if ((op->common.parent->common.aml_opcode == AML_REGION_OP) || (op->common.parent->common.aml_opcode == AML_DATA_REGION_OP) || (op->common.parent->common.aml_opcode == AML_BUFFER_OP) || (op->common.parent->common.aml_opcode == AML_PACKAGE_OP) || (op->common.parent->common.aml_opcode == AML_VAR_PACKAGE_OP)) { replacement_op = acpi_ps_alloc_op (AML_INT_RETURN_VALUE_OP); if (!replacement_op) { return_VOID; } } if ((op->common.parent->common.aml_opcode == AML_NAME_OP) && (walk_state->descending_callback != acpi_ds_exec_begin_op)) { if ((op->common.aml_opcode == AML_BUFFER_OP) || (op->common.aml_opcode == AML_PACKAGE_OP) || (op->common.aml_opcode == AML_VAR_PACKAGE_OP)) { replacement_op = acpi_ps_alloc_op (op->common.aml_opcode); if (!replacement_op) { return_VOID; } replacement_op->named.data = op->named.data; replacement_op->named.length = op->named.length; } } break; default: replacement_op = acpi_ps_alloc_op (AML_INT_RETURN_VALUE_OP); if (!replacement_op) { return_VOID; } } /* We must unlink this op from the parent tree */ prev = op->common.parent->common.value.arg; if (prev == op) { /* This op is the first in the list */ if (replacement_op) { replacement_op->common.parent = op->common.parent; replacement_op->common.value.arg = NULL; replacement_op->common.node = op->common.node; op->common.parent->common.value.arg = replacement_op; replacement_op->common.next = op->common.next; } else { op->common.parent->common.value.arg = op->common.next; } } /* Search the parent list */ else while (prev) { /* Traverse all siblings in the parent's argument list */ next = prev->common.next; if (next == op) { if (replacement_op) { replacement_op->common.parent = op->common.parent; replacement_op->common.value.arg = NULL; replacement_op->common.node = op->common.node; prev->common.next = replacement_op; replacement_op->common.next = op->common.next; next = NULL; } else { prev->common.next = op->common.next; next = NULL; } } prev = next; } } /* Now we can actually delete the subtree rooted at op */ acpi_ps_delete_parse_tree (op); return_VOID; } return_VOID; } /******************************************************************************* * * FUNCTION: acpi_ps_next_parse_state * * PARAMETERS: parser_state - Current parser state object * * RETURN: Status * * DESCRIPTION: Update the parser state based upon the return exception from * the parser callback. * ******************************************************************************/ acpi_status acpi_ps_next_parse_state ( struct acpi_walk_state *walk_state, union acpi_parse_object *op, acpi_status callback_status) { struct acpi_parse_state *parser_state = &walk_state->parser_state; acpi_status status = AE_CTRL_PENDING; ACPI_FUNCTION_TRACE_PTR ("ps_next_parse_state", op); switch (callback_status) { case AE_CTRL_TERMINATE: /* * A control method was terminated via a RETURN statement. * The walk of this method is complete. */ parser_state->aml = parser_state->aml_end; status = AE_CTRL_TERMINATE; break; case AE_CTRL_BREAK: parser_state->aml = walk_state->aml_last_while; walk_state->control_state->common.value = FALSE; status = AE_CTRL_BREAK; break; case AE_CTRL_CONTINUE: parser_state->aml = walk_state->aml_last_while; status = AE_CTRL_CONTINUE; break; case AE_CTRL_PENDING: parser_state->aml = walk_state->aml_last_while; break; #if 0 case AE_CTRL_SKIP: parser_state->aml = parser_state->scope->parse_scope.pkg_end; status = AE_OK; break; #endif case AE_CTRL_TRUE: /* * Predicate of an IF was true, and we are at the matching ELSE. * Just close out this package */ parser_state->aml = acpi_ps_get_next_package_end (parser_state); break; case AE_CTRL_FALSE: /* * Either an IF/WHILE Predicate was false or we encountered a BREAK * opcode. In both cases, we do not execute the rest of the * package; We simply close out the parent (finishing the walk of * this branch of the tree) and continue execution at the parent * level. */ parser_state->aml = parser_state->scope->parse_scope.pkg_end; /* In the case of a BREAK, just force a predicate (if any) to FALSE */ walk_state->control_state->common.value = FALSE; status = AE_CTRL_END; break; case AE_CTRL_TRANSFER: /* * A method call (invocation) -- transfer control */ status = AE_CTRL_TRANSFER; walk_state->prev_op = op; walk_state->method_call_op = op; walk_state->method_call_node = (op->common.value.arg)->common.node; /* Will return value (if any) be used by the caller? */ walk_state->return_used = acpi_ds_is_result_used (op, walk_state); break; default: status = callback_status; if ((callback_status & AE_CODE_MASK) == AE_CODE_CONTROL) { status = AE_OK; } break; } return_ACPI_STATUS (status); } /******************************************************************************* * * FUNCTION: acpi_ps_parse_loop * * PARAMETERS: parser_state - Current parser state object * * RETURN: Status * * DESCRIPTION: Parse AML (pointed to by the current parser state) and return * a tree of ops. * ******************************************************************************/ acpi_status acpi_ps_parse_loop ( struct acpi_walk_state *walk_state) { acpi_status status = AE_OK; union acpi_parse_object *op = NULL; /* current op */ union acpi_parse_object *arg = NULL; union acpi_parse_object *pre_op = NULL; struct acpi_parse_state *parser_state; u8 *aml_op_start = NULL; ACPI_FUNCTION_TRACE_PTR ("ps_parse_loop", walk_state); if (walk_state->descending_callback == NULL) { return_ACPI_STATUS (AE_BAD_PARAMETER); } parser_state = &walk_state->parser_state; walk_state->arg_types = 0; #if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY)) if (walk_state->walk_type & ACPI_WALK_METHOD_RESTART) { /* We are restarting a preempted control method */ if (acpi_ps_has_completed_scope (parser_state)) { /* * We must check if a predicate to an IF or WHILE statement * was just completed */ if ((parser_state->scope->parse_scope.op) && ((parser_state->scope->parse_scope.op->common.aml_opcode == AML_IF_OP) || (parser_state->scope->parse_scope.op->common.aml_opcode == AML_WHILE_OP)) && (walk_state->control_state) && (walk_state->control_state->common.state == ACPI_CONTROL_PREDICATE_EXECUTING)) { /* * A predicate was just completed, get the value of the * predicate and branch based on that value */ walk_state->op = NULL; status = acpi_ds_get_predicate_value (walk_state, ACPI_TO_POINTER (TRUE)); if (ACPI_FAILURE (status) && ((status & AE_CODE_MASK) != AE_CODE_CONTROL)) { if (status == AE_AML_NO_RETURN_VALUE) { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invoked method did not return a value, %s\n", acpi_format_exception (status))); } ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "get_predicate Failed, %s\n", acpi_format_exception (status))); return_ACPI_STATUS (status); } status = acpi_ps_next_parse_state (walk_state, op, status); } acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, &walk_state->arg_count); ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op)); } else if (walk_state->prev_op) { /* We were in the middle of an op */ op = walk_state->prev_op; walk_state->arg_types = walk_state->prev_arg_types; } } #endif /* * Iterative parsing loop, while there is more aml to process: */ while ((parser_state->aml < parser_state->aml_end) || (op)) { aml_op_start = parser_state->aml; if (!op) { /* Get the next opcode from the AML stream */ walk_state->aml_offset = (u32) ACPI_PTR_DIFF (parser_state->aml, parser_state->aml_start); walk_state->opcode = acpi_ps_peek_opcode (parser_state); /* * First cut to determine what we have found: * 1) A valid AML opcode * 2) A name string * 3) An unknown/invalid opcode */ walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode); switch (walk_state->op_info->class) { case AML_CLASS_ASCII: case AML_CLASS_PREFIX: /* * Starts with a valid prefix or ASCII char, this is a name * string. Convert the bare name string to a namepath. */ walk_state->opcode = AML_INT_NAMEPATH_OP; walk_state->arg_types = ARGP_NAMESTRING; break; case AML_CLASS_UNKNOWN: /* The opcode is unrecognized. Just skip unknown opcodes */ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Found unknown opcode %X at AML address %p offset %X, ignoring\n", walk_state->opcode, parser_state->aml, walk_state->aml_offset)); ACPI_DUMP_BUFFER (parser_state->aml, 128); /* Assume one-byte bad opcode */ parser_state->aml++; continue; default: /* Found opcode info, this is a normal opcode */ parser_state->aml += acpi_ps_get_opcode_size (walk_state->opcode); walk_state->arg_types = walk_state->op_info->parse_args; break; } /* Create Op structure and append to parent's argument list */ if (walk_state->op_info->flags & AML_NAMED) { /* Allocate a new pre_op if necessary */ if (!pre_op) { pre_op = acpi_ps_alloc_op (walk_state->opcode); if (!pre_op) { return_ACPI_STATUS (AE_NO_MEMORY); } } pre_op->common.value.arg = NULL; pre_op->common.aml_opcode = walk_state->opcode; /* * Get and append arguments until we find the node that contains * the name (the type ARGP_NAME). */ while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) && (GET_CURRENT_ARG_TYPE (walk_state->arg_types) != ARGP_NAME)) { status = acpi_ps_get_next_arg (walk_state, parser_state, GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg); if (ACPI_FAILURE (status)) { goto close_this_op; } acpi_ps_append_arg (pre_op, arg); INCREMENT_ARG_LIST (walk_state->arg_types); } /* Make sure that we found a NAME and didn't run out of arguments */ if (!GET_CURRENT_ARG_TYPE (walk_state->arg_types)) { return_ACPI_STATUS (AE_AML_NO_OPERAND); } /* We know that this arg is a name, move to next arg */ INCREMENT_ARG_LIST (walk_state->arg_types); /* * Find the object. This will either insert the object into * the namespace or simply look it up */ walk_state->op = NULL; status = walk_state->descending_callback (walk_state, &op); if (ACPI_FAILURE (status)) { ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "During name lookup/catalog, %s\n", acpi_format_exception (status))); goto close_this_op; } if (op == NULL) { continue; } status = acpi_ps_next_parse_state (walk_state, op, status); if (status == AE_CTRL_PENDING) { status = AE_OK; goto close_this_op; } if (ACPI_FAILURE (status)) { goto close_this_op; } acpi_ps_append_arg (op, pre_op->common.value.arg); acpi_gbl_depth++; if (op->common.aml_opcode == AML_REGION_OP) { /* * Defer final parsing of an operation_region body, * because we don't have enough info in the first pass * to parse it correctly (i.e., there may be method * calls within the term_arg elements of the body.) * * However, we must continue parsing because * the opregion is not a standalone package -- * we don't know where the end is at this point. * * (Length is unknown until parse of the body complete) */ op->named.data = aml_op_start; op->named.length = 0; } } else { /* Not a named opcode, just allocate Op and append to parent */ walk_state->op_info = acpi_ps_get_opcode_info (walk_state->opcode); op = acpi_ps_alloc_op (walk_state->opcode); if (!op) { return_ACPI_STATUS (AE_NO_MEMORY); } if (walk_state->op_info->flags & AML_CREATE) { /* * Backup to beginning of create_xXXfield declaration * body_length is unknown until we parse the body */ op->named.data = aml_op_start; op->named.length = 0; } acpi_ps_append_arg (acpi_ps_get_parent_scope (parser_state), op); if ((walk_state->descending_callback != NULL)) { /* * Find the object. This will either insert the object into * the namespace or simply look it up */ walk_state->op = op; status = walk_state->descending_callback (walk_state, &op); status = acpi_ps_next_parse_state (walk_state, op, status); if (status == AE_CTRL_PENDING) { status = AE_OK; goto close_this_op; } if (ACPI_FAILURE (status)) { goto close_this_op; } } } op->common.aml_offset = walk_state->aml_offset; if (walk_state->op_info) { ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Opcode %4.4X [%s] Op %p Aml %p aml_offset %5.5X\n", (u32) op->common.aml_opcode, walk_state->op_info->name, op, parser_state->aml, op->common.aml_offset)); } } /* Start arg_count at zero because we don't know if there are any args yet */ walk_state->arg_count = 0; if (walk_state->arg_types) /* Are there any arguments that must be processed? */ { /* Get arguments */ switch (op->common.aml_opcode) { case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ case AML_WORD_OP: /* AML_WORDDATA_ARG */ case AML_DWORD_OP: /* AML_DWORDATA_ARG */ case AML_QWORD_OP: /* AML_QWORDATA_ARG */ case AML_STRING_OP: /* AML_ASCIICHARLIST_ARG */ /* Fill in constant or string argument directly */ acpi_ps_get_next_simple_arg (parser_state, GET_CURRENT_ARG_TYPE (walk_state->arg_types), op); break; case AML_INT_NAMEPATH_OP: /* AML_NAMESTRING_ARG */ status = acpi_ps_get_next_namepath (walk_state, parser_state, op, 1); if (ACPI_FAILURE (status)) { goto close_this_op; } walk_state->arg_types = 0; break; default: /* Op is not a constant or string, append each argument to the Op */ while (GET_CURRENT_ARG_TYPE (walk_state->arg_types) && !walk_state->arg_count) { walk_state->aml_offset = (u32) ACPI_PTR_DIFF (parser_state->aml, parser_state->aml_start); status = acpi_ps_get_next_arg (walk_state, parser_state, GET_CURRENT_ARG_TYPE (walk_state->arg_types), &arg); if (ACPI_FAILURE (status)) { goto close_this_op; } if (arg) { arg->common.aml_offset = walk_state->aml_offset; acpi_ps_append_arg (op, arg); } INCREMENT_ARG_LIST (walk_state->arg_types); } /* Special processing for certain opcodes */ switch (op->common.aml_opcode) { case AML_METHOD_OP: /* * Skip parsing of control method * because we don't have enough info in the first pass * to parse it correctly. * * Save the length and address of the body */ op->named.data = parser_state->aml; op->named.length = (u32) (parser_state->pkg_end - parser_state->aml); /* Skip body of method */ parser_state->aml = parser_state->pkg_end; walk_state->arg_count = 0; break; case AML_BUFFER_OP: case AML_PACKAGE_OP: case AML_VAR_PACKAGE_OP: if ((op->common.parent) && (op->common.parent->common.aml_opcode == AML_NAME_OP) && (walk_state->descending_callback != acpi_ds_exec_begin_op)) { /* * Skip parsing of Buffers and Packages * because we don't have enough info in the first pass * to parse them correctly. */ op->named.data = aml_op_start; op->named.length = (u32) (parser_state->pkg_end - aml_op_start); /* Skip body */ parser_state->aml = parser_state->pkg_end; walk_state->arg_count = 0; } break; case AML_WHILE_OP: if (walk_state->control_state) { walk_state->control_state->control.package_end = parser_state->pkg_end; } break; default: /* No action for all other opcodes */ break; } break; } } /* Check for arguments that need to be processed */ if (walk_state->arg_count) { /* There are arguments (complex ones), push Op and prepare for argument */ status = acpi_ps_push_scope (parser_state, op, walk_state->arg_types, walk_state->arg_count); if (ACPI_FAILURE (status)) { return_ACPI_STATUS (status); } op = NULL; continue; } /* All arguments have been processed -- Op is complete, prepare for next */ walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode); if (walk_state->op_info->flags & AML_NAMED) { if (acpi_gbl_depth) { acpi_gbl_depth--; } if (op->common.aml_opcode == AML_REGION_OP) { /* * Skip parsing of control method or opregion body, * because we don't have enough info in the first pass * to parse them correctly. * * Completed parsing an op_region declaration, we now * know the length. */ op->named.length = (u32) (parser_state->aml - op->named.data); } } if (walk_state->op_info->flags & AML_CREATE) { /* * Backup to beginning of create_xXXfield declaration (1 for * Opcode) * * body_length is unknown until we parse the body */ op->named.length = (u32) (parser_state->aml - op->named.data); } /* This op complete, notify the dispatcher */ if (walk_state->ascending_callback != NULL) { walk_state->op = op; walk_state->opcode = op->common.aml_opcode; status = walk_state->ascending_callback (walk_state); status = acpi_ps_next_parse_state (walk_state, op, status); if (status == AE_CTRL_PENDING) { status = AE_OK; goto close_this_op; } } close_this_op: /* * Finished one argument of the containing scope */ parser_state->scope->parse_scope.arg_count--; /* Close this Op (will result in parse subtree deletion) */ acpi_ps_complete_this_op (walk_state, op); op = NULL; if (pre_op) { acpi_ps_free_op (pre_op); pre_op = NULL; } switch (status) { case AE_OK: break; case AE_CTRL_TRANSFER: /* * We are about to transfer to a called method. */ walk_state->prev_op = op; walk_state->prev_arg_types = walk_state->arg_types; return_ACPI_STATUS (status); case AE_CTRL_END: acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, &walk_state->arg_count); if (op) { walk_state->op = op; walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode); walk_state->opcode = op->common.aml_opcode; status = walk_state->ascending_callback (walk_state); status = acpi_ps_next_parse_state (walk_state, op, status); acpi_ps_complete_this_op (walk_state, op); op = NULL; } status = AE_OK; break; case AE_CTRL_BREAK: case AE_CTRL_CONTINUE: /* Pop off scopes until we find the While */ while (!op || (op->common.aml_opcode != AML_WHILE_OP)) { acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, &walk_state->arg_count); } /* Close this iteration of the While loop */ walk_state->op = op; walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode); walk_state->opcode = op->common.aml_opcode; status = walk_state->ascending_callback (walk_state); status = acpi_ps_next_parse_state (walk_state, op, status); acpi_ps_complete_this_op (walk_state, op); op = NULL; status = AE_OK; break; case AE_CTRL_TERMINATE: status = AE_OK; /* Clean up */ do { if (op) { acpi_ps_complete_this_op (walk_state, op); } acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, &walk_state->arg_count); } while (op); return_ACPI_STATUS (status); default: /* All other non-AE_OK status */ do { if (op) { acpi_ps_complete_this_op (walk_state, op); } acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, &walk_state->arg_count); } while (op); /* * TBD: Cleanup parse ops on error */ #if 0 if (op == NULL) { acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, &walk_state->arg_count); } #endif walk_state->prev_op = op; walk_state->prev_arg_types = walk_state->arg_types; return_ACPI_STATUS (status); } /* This scope complete? */ if (acpi_ps_has_completed_scope (parser_state)) { acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, &walk_state->arg_count); ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped scope, Op=%p\n", op)); } else { op = NULL; } } /* while parser_state->Aml */ /* * Complete the last Op (if not completed), and clear the scope stack. * It is easily possible to end an AML "package" with an unbounded number * of open scopes (such as when several ASL blocks are closed with * sequential closing braces). We want to terminate each one cleanly. */ ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "AML package complete at Op %p\n", op)); do { if (op) { if (walk_state->ascending_callback != NULL) { walk_state->op = op; walk_state->op_info = acpi_ps_get_opcode_info (op->common.aml_opcode); walk_state->opcode = op->common.aml_opcode; status = walk_state->ascending_callback (walk_state); status = acpi_ps_next_parse_state (walk_state, op, status); if (status == AE_CTRL_PENDING) { status = AE_OK; goto close_this_op; } if (status == AE_CTRL_TERMINATE) { status = AE_OK; /* Clean up */ do { if (op) { acpi_ps_complete_this_op (walk_state, op); } acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, &walk_state->arg_count); } while (op); return_ACPI_STATUS (status); } else if (ACPI_FAILURE (status)) { acpi_ps_complete_this_op (walk_state, op); return_ACPI_STATUS (status); } } acpi_ps_complete_this_op (walk_state, op); } acpi_ps_pop_scope (parser_state, &op, &walk_state->arg_types, &walk_state->arg_count); } while (op); return_ACPI_STATUS (status); } /******************************************************************************* * * FUNCTION: acpi_ps_parse_aml * * PARAMETERS: start_scope - The starting point of the parse. Becomes the * root of the parsed op tree. * Aml - Pointer to the raw AML code to parse * aml_size - Length of the AML to parse * * * RETURN: Status * * DESCRIPTION: Parse raw AML and return a tree of ops * ******************************************************************************/ acpi_status acpi_ps_parse_aml ( struct acpi_walk_state *walk_state) { acpi_status status; acpi_status terminate_status; struct acpi_thread_state *thread; struct acpi_thread_state *prev_walk_list = acpi_gbl_current_walk_list; struct acpi_walk_state *previous_walk_state; ACPI_FUNCTION_TRACE ("ps_parse_aml"); ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Entered with walk_state=%p Aml=%p size=%X\n", walk_state, walk_state->parser_state.aml, walk_state->parser_state.aml_size)); /* Create and initialize a new thread state */ thread = acpi_ut_create_thread_state (); if (!thread) { return_ACPI_STATUS (AE_NO_MEMORY); } walk_state->thread = thread; acpi_ds_push_walk_state (walk_state, thread); /* * This global allows the AML debugger to get a handle to the currently * executing control method. */ acpi_gbl_current_walk_list = thread; /* * Execute the walk loop as long as there is a valid Walk State. This * handles nested control method invocations without recursion. */ ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "State=%p\n", walk_state)); status = AE_OK; while (walk_state) { if (ACPI_SUCCESS (status)) { /* * The parse_loop executes AML until the method terminates * or calls another method. */ status = acpi_ps_parse_loop (walk_state); } ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Completed one call to walk loop, %s State=%p\n", acpi_format_exception (status), walk_state)); if (status == AE_CTRL_TRANSFER) { /* * A method call was detected. * Transfer control to the called control method */ status = acpi_ds_call_control_method (thread, walk_state, NULL); /* * If the transfer to the new method method call worked, a new walk * state was created -- get it */ walk_state = acpi_ds_get_current_walk_state (thread); continue; } else if (status == AE_CTRL_TERMINATE) { status = AE_OK; } else if (status != AE_OK) { ACPI_REPORT_METHOD_ERROR ("Method execution failed", walk_state->method_node, NULL, status); /* Check for possible multi-thread reentrancy problem */ if ((status == AE_ALREADY_EXISTS) && (!walk_state->method_desc->method.semaphore)) { /* * This method is marked not_serialized, but it tried to create a named * object, causing the second thread entrance to fail. We will workaround * this by marking the method permanently as Serialized. */ walk_state->method_desc->method.method_flags |= AML_METHOD_SERIALIZED; walk_state->method_desc->method.concurrency = 1; } } if (walk_state->method_desc) { /* Decrement the thread count on the method parse tree */ if (walk_state->method_desc->method.thread_count) { walk_state->method_desc->method.thread_count--; } } /* We are done with this walk, move on to the parent if any */ walk_state = acpi_ds_pop_walk_state (thread); /* Reset the current scope to the beginning of scope stack */ acpi_ds_scope_stack_clear (walk_state); /* * If we just returned from the execution of a control method, * there's lots of cleanup to do */ if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == ACPI_PARSE_EXECUTE) { terminate_status = acpi_ds_terminate_control_method (walk_state); if (ACPI_FAILURE (terminate_status)) { ACPI_REPORT_ERROR (( "Could not terminate control method properly\n")); /* Ignore error and continue */ } } /* Delete this walk state and all linked control states */ acpi_ps_cleanup_scope (&walk_state->parser_state); previous_walk_state = walk_state; ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "return_value=%p, State=%p\n", walk_state->return_desc, walk_state)); /* Check if we have restarted a preempted walk */ walk_state = acpi_ds_get_current_walk_state (thread); if (walk_state) { if (ACPI_SUCCESS (status)) { /* * There is another walk state, restart it. * If the method return value is not used by the parent, * The object is deleted */ status = acpi_ds_restart_control_method (walk_state, previous_walk_state->return_desc); if (ACPI_SUCCESS (status)) { walk_state->walk_type |= ACPI_WALK_METHOD_RESTART; } } else { /* On error, delete any return object */ acpi_ut_remove_reference (previous_walk_state->return_desc); } } /* * Just completed a 1st-level method, save the final internal return * value (if any) */ else if (previous_walk_state->caller_return_desc) { *(previous_walk_state->caller_return_desc) = previous_walk_state->return_desc; /* NULL if no return value */ } else if (previous_walk_state->return_desc) { /* Caller doesn't want it, must delete it */ acpi_ut_remove_reference (previous_walk_state->return_desc); } acpi_ds_delete_walk_state (previous_walk_state); } /* Normal exit */ acpi_ex_release_all_mutexes (thread); acpi_ut_delete_generic_state (ACPI_CAST_PTR (union acpi_generic_state, thread)); acpi_gbl_current_walk_list = prev_walk_list; return_ACPI_STATUS (status); }