--- /dev/null
+/******************************************************************************
+ *
+ * Module Name: psloop - Main AML parse loop
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2006, 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 <acpi/acpi.h>
+#include <acpi/acparser.h>
+#include <acpi/acdispat.h>
+#include <acpi/amlcode.h>
+
+#define _COMPONENT ACPI_PARSER
+ACPI_MODULE_NAME("psloop")
+
+static u32 acpi_gbl_depth = 0;
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ps_parse_loop
+ *
+ * PARAMETERS: walk_state - Current state
+ *
+ * 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;
+ acpi_status status2;
+ 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_EXCEPTION((AE_INFO, status,
+ "Invoked method did not return a value"));
+
+ }
+ ACPI_EXCEPTION((AE_INFO, status,
+ "get_predicate Failed"));
+ 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_ERROR((AE_INFO,
+ "Found unknown opcode %X at AML address %p offset %X, ignoring",
+ 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) {
+ status = AE_NO_MEMORY;
+ goto close_this_op;
+ }
+ }
+
+ 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)) {
+ status = AE_AML_NO_OPERAND;
+ goto close_this_op;
+ }
+
+ /* 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_EXCEPTION((AE_INFO, status,
+ "During name lookup/catalog"));
+ goto close_this_op;
+ }
+
+ if (!op) {
+ 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) {
+ status = AE_NO_MEMORY;
+ goto close_this_op;
+ }
+
+ 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;
+
+ /* Are there any arguments that must be processed? */
+
+ if (walk_state->arg_types) {
+ /* 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 */
+
+ /* TBD (remove): Temporary mechanism to disable this code if needed */
+
+#ifdef ACPI_ENABLE_MODULE_LEVEL_CODE
+
+ if ((walk_state->pass_number <=
+ ACPI_IMODE_LOAD_PASS1)
+ &&
+ ((walk_state->
+ parse_flags & ACPI_PARSE_DISASSEMBLE) ==
+ 0)) {
+ /*
+ * We want to skip If/Else/While constructs during Pass1
+ * because we want to actually conditionally execute the
+ * code during Pass2.
+ *
+ * Except for disassembly, where we always want to
+ * walk the If/Else/While packages
+ */
+ switch (op->common.aml_opcode) {
+ case AML_IF_OP:
+ case AML_ELSE_OP:
+ case AML_WHILE_OP:
+
+ ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
+ "Pass1: Skipping an If/Else/While body\n"));
+
+ /* Skip body of if/else/while in pass 1 */
+
+ parser_state->aml =
+ parser_state->pkg_end;
+ walk_state->arg_count = 0;
+ break;
+
+ default:
+ break;
+ }
+ }
+#endif
+ 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->pass_number <=
+ ACPI_IMODE_LOAD_PASS2)) {
+ /*
+ * 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)) {
+ goto close_this_op;
+ }
+ 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--;
+
+ /* Finished with pre_op */
+
+ if (pre_op) {
+ acpi_ps_free_op(pre_op);
+ pre_op = NULL;
+ }
+
+ /* Close this Op (will result in parse subtree deletion) */
+
+ status2 = acpi_ps_complete_this_op(walk_state, op);
+ if (ACPI_FAILURE(status2)) {
+ return_ACPI_STATUS(status2);
+ }
+ 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);
+
+ status2 =
+ acpi_ps_complete_this_op(walk_state, op);
+ if (ACPI_FAILURE(status2)) {
+ return_ACPI_STATUS(status2);
+ }
+ 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);
+
+ if (op->common.aml_opcode != AML_WHILE_OP) {
+ status2 =
+ acpi_ds_result_stack_pop
+ (walk_state);
+ if (ACPI_FAILURE(status2)) {
+ return_ACPI_STATUS(status2);
+ }
+ }
+ }
+
+ /* 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);
+
+ status2 = acpi_ps_complete_this_op(walk_state, op);
+ if (ACPI_FAILURE(status2)) {
+ return_ACPI_STATUS(status2);
+ }
+ op = NULL;
+
+ status = AE_OK;
+ break;
+
+ case AE_CTRL_TERMINATE:
+
+ status = AE_OK;
+
+ /* Clean up */
+ do {
+ if (op) {
+ status2 =
+ acpi_ps_complete_this_op(walk_state,
+ op);
+ if (ACPI_FAILURE(status2)) {
+ return_ACPI_STATUS(status2);
+ }
+ }
+ 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) {
+ status2 =
+ acpi_ps_complete_this_op(walk_state,
+ op);
+ if (ACPI_FAILURE(status2)) {
+ return_ACPI_STATUS(status2);
+ }
+ }
+ 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) {
+ status2 =
+ acpi_ps_complete_this_op
+ (walk_state, op);
+ if (ACPI_FAILURE
+ (status2)) {
+ return_ACPI_STATUS
+ (status2);
+ }
+ }
+
+ 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)) {
+ /* First error is most important */
+
+ (void)
+ acpi_ps_complete_this_op(walk_state,
+ op);
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ status2 = acpi_ps_complete_this_op(walk_state, op);
+ if (ACPI_FAILURE(status2)) {
+ return_ACPI_STATUS(status2);
+ }
+ }
+
+ acpi_ps_pop_scope(parser_state, &op, &walk_state->arg_types,
+ &walk_state->arg_count);
+
+ } while (op);
+
+ return_ACPI_STATUS(status);
+}
git://git.onelab.eu / linux-2.6.git / blobdiff