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-rw-r--r--drivers/acpi/parser/pstree.c327
1 files changed, 327 insertions, 0 deletions
diff --git a/drivers/acpi/parser/pstree.c b/drivers/acpi/parser/pstree.c
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+++ b/drivers/acpi/parser/pstree.c
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+/******************************************************************************
+ *
+ * Module Name: pstree - Parser op tree manipulation/traversal/search
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, 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.
+ */
+
+
+#include <acpi/acpi.h>
+#include <acpi/acparser.h>
+#include <acpi/amlcode.h>
+
+#define _COMPONENT ACPI_PARSER
+ ACPI_MODULE_NAME ("pstree")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ps_get_arg
+ *
+ * PARAMETERS: Op - Get an argument for this op
+ * Argn - Nth argument to get
+ *
+ * RETURN: The argument (as an Op object). NULL if argument does not exist
+ *
+ * DESCRIPTION: Get the specified op's argument.
+ *
+ ******************************************************************************/
+
+union acpi_parse_object *
+acpi_ps_get_arg (
+ union acpi_parse_object *op,
+ u32 argn)
+{
+ union acpi_parse_object *arg = NULL;
+ const struct acpi_opcode_info *op_info;
+
+
+ ACPI_FUNCTION_ENTRY ();
+
+
+ /* Get the info structure for this opcode */
+
+ op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
+ if (op_info->class == AML_CLASS_UNKNOWN) {
+ /* Invalid opcode or ASCII character */
+
+ return (NULL);
+ }
+
+ /* Check if this opcode requires argument sub-objects */
+
+ if (!(op_info->flags & AML_HAS_ARGS)) {
+ /* Has no linked argument objects */
+
+ return (NULL);
+ }
+
+ /* Get the requested argument object */
+
+ arg = op->common.value.arg;
+ while (arg && argn) {
+ argn--;
+ arg = arg->common.next;
+ }
+
+ return (arg);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ps_append_arg
+ *
+ * PARAMETERS: Op - Append an argument to this Op.
+ * Arg - Argument Op to append
+ *
+ * RETURN: None.
+ *
+ * DESCRIPTION: Append an argument to an op's argument list (a NULL arg is OK)
+ *
+ ******************************************************************************/
+
+void
+acpi_ps_append_arg (
+ union acpi_parse_object *op,
+ union acpi_parse_object *arg)
+{
+ union acpi_parse_object *prev_arg;
+ const struct acpi_opcode_info *op_info;
+
+
+ ACPI_FUNCTION_ENTRY ();
+
+
+ if (!op) {
+ return;
+ }
+
+ /* Get the info structure for this opcode */
+
+ op_info = acpi_ps_get_opcode_info (op->common.aml_opcode);
+ if (op_info->class == AML_CLASS_UNKNOWN) {
+ /* Invalid opcode */
+
+ ACPI_REPORT_ERROR (("ps_append_arg: Invalid AML Opcode: 0x%2.2X\n",
+ op->common.aml_opcode));
+ return;
+ }
+
+ /* Check if this opcode requires argument sub-objects */
+
+ if (!(op_info->flags & AML_HAS_ARGS)) {
+ /* Has no linked argument objects */
+
+ return;
+ }
+
+
+ /* Append the argument to the linked argument list */
+
+ if (op->common.value.arg) {
+ /* Append to existing argument list */
+
+ prev_arg = op->common.value.arg;
+ while (prev_arg->common.next) {
+ prev_arg = prev_arg->common.next;
+ }
+ prev_arg->common.next = arg;
+ }
+
+ else {
+ /* No argument list, this will be the first argument */
+
+ op->common.value.arg = arg;
+ }
+
+
+ /* Set the parent in this arg and any args linked after it */
+
+ while (arg) {
+ arg->common.parent = op;
+ arg = arg->common.next;
+ }
+}
+
+
+#ifdef ACPI_FUTURE_USAGE
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ps_get_child
+ *
+ * PARAMETERS: Op - Get the child of this Op
+ *
+ * RETURN: Child Op, Null if none is found.
+ *
+ * DESCRIPTION: Get op's children or NULL if none
+ *
+ ******************************************************************************/
+union acpi_parse_object *
+acpi_ps_get_child (
+ union acpi_parse_object *op)
+{
+ union acpi_parse_object *child = NULL;
+
+
+ ACPI_FUNCTION_ENTRY ();
+
+
+ switch (op->common.aml_opcode) {
+ case AML_SCOPE_OP:
+ case AML_ELSE_OP:
+ case AML_DEVICE_OP:
+ case AML_THERMAL_ZONE_OP:
+ case AML_INT_METHODCALL_OP:
+
+ child = acpi_ps_get_arg (op, 0);
+ break;
+
+
+ case AML_BUFFER_OP:
+ case AML_PACKAGE_OP:
+ case AML_METHOD_OP:
+ case AML_IF_OP:
+ case AML_WHILE_OP:
+ case AML_FIELD_OP:
+
+ child = acpi_ps_get_arg (op, 1);
+ break;
+
+
+ case AML_POWER_RES_OP:
+ case AML_INDEX_FIELD_OP:
+
+ child = acpi_ps_get_arg (op, 2);
+ break;
+
+
+ case AML_PROCESSOR_OP:
+ case AML_BANK_FIELD_OP:
+
+ child = acpi_ps_get_arg (op, 3);
+ break;
+
+
+ default:
+ /* All others have no children */
+ break;
+ }
+
+ return (child);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ps_get_depth_next
+ *
+ * PARAMETERS: Origin - Root of subtree to search
+ * Op - Last (previous) Op that was found
+ *
+ * RETURN: Next Op found in the search.
+ *
+ * DESCRIPTION: Get next op in tree (walking the tree in depth-first order)
+ * Return NULL when reaching "origin" or when walking up from root
+ *
+ ******************************************************************************/
+
+union acpi_parse_object *
+acpi_ps_get_depth_next (
+ union acpi_parse_object *origin,
+ union acpi_parse_object *op)
+{
+ union acpi_parse_object *next = NULL;
+ union acpi_parse_object *parent;
+ union acpi_parse_object *arg;
+
+
+ ACPI_FUNCTION_ENTRY ();
+
+
+ if (!op) {
+ return (NULL);
+ }
+
+ /* look for an argument or child */
+
+ next = acpi_ps_get_arg (op, 0);
+ if (next) {
+ return (next);
+ }
+
+ /* look for a sibling */
+
+ next = op->common.next;
+ if (next) {
+ return (next);
+ }
+
+ /* look for a sibling of parent */
+
+ parent = op->common.parent;
+
+ while (parent) {
+ arg = acpi_ps_get_arg (parent, 0);
+ while (arg && (arg != origin) && (arg != op)) {
+ arg = arg->common.next;
+ }
+
+ if (arg == origin) {
+ /* reached parent of origin, end search */
+
+ return (NULL);
+ }
+
+ if (parent->common.next) {
+ /* found sibling of parent */
+
+ return (parent->common.next);
+ }
+
+ op = parent;
+ parent = parent->common.parent;
+ }
+
+ return (next);
+}
+
+#endif /* ACPI_FUTURE_USAGE */
+
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