Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 637 insertions, 0 deletions

diff --git a/drivers/acpi/namespace/nsaccess.c b/drivers/acpi/namespace/nsaccess.c
new file mode 100644
index 00000000000..1c0c12336c5
--- /dev/null
+++ b/drivers/acpi/namespace/nsaccess.c
@@ -0,0 +1,637 @@
+/*******************************************************************************
+ *
+ * Module Name: nsaccess - Top-level functions for accessing ACPI namespace
+ *
+ ******************************************************************************/
+
+/*
+ * 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/amlcode.h>
+#include <acpi/acnamesp.h>
+#include <acpi/acdispat.h>
+
+
+#define _COMPONENT          ACPI_NAMESPACE
+	 ACPI_MODULE_NAME    ("nsaccess")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_root_initialize
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Allocate and initialize the default root named objects
+ *
+ * MUTEX:       Locks namespace for entire execution
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_root_initialize (void)
+{
+	acpi_status                         status;
+	const struct acpi_predefined_names *init_val = NULL;
+	struct acpi_namespace_node          *new_node;
+	union acpi_operand_object           *obj_desc;
+	acpi_string                         val = NULL;
+
+
+	ACPI_FUNCTION_TRACE ("ns_root_initialize");
+
+
+	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	/*
+	 * The global root ptr is initially NULL, so a non-NULL value indicates
+	 * that acpi_ns_root_initialize() has already been called; just return.
+	 */
+	if (acpi_gbl_root_node) {
+		status = AE_OK;
+		goto unlock_and_exit;
+	}
+
+	/*
+	 * Tell the rest of the subsystem that the root is initialized
+	 * (This is OK because the namespace is locked)
+	 */
+	acpi_gbl_root_node = &acpi_gbl_root_node_struct;
+
+	/* Enter the pre-defined names in the name table */
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
+		"Entering predefined entries into namespace\n"));
+
+	for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) {
+		/* _OSI is optional for now, will be permanent later */
+
+		if (!ACPI_STRCMP (init_val->name, "_OSI") && !acpi_gbl_create_osi_method) {
+			continue;
+		}
+
+		status = acpi_ns_lookup (NULL, init_val->name, init_val->type,
+				  ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH,
+				  NULL, &new_node);
+
+		if (ACPI_FAILURE (status) || (!new_node)) /* Must be on same line for code converter */ {
+			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+				"Could not create predefined name %s, %s\n",
+				init_val->name, acpi_format_exception (status)));
+		}
+
+		/*
+		 * Name entered successfully.
+		 * If entry in pre_defined_names[] specifies an
+		 * initial value, create the initial value.
+		 */
+		if (init_val->val) {
+			status = acpi_os_predefined_override (init_val, &val);
+			if (ACPI_FAILURE (status)) {
+				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+					"Could not override predefined %s\n",
+					init_val->name));
+			}
+
+			if (!val) {
+				val = init_val->val;
+			}
+
+			/*
+			 * Entry requests an initial value, allocate a
+			 * descriptor for it.
+			 */
+			obj_desc = acpi_ut_create_internal_object (init_val->type);
+			if (!obj_desc) {
+				status = AE_NO_MEMORY;
+				goto unlock_and_exit;
+			}
+
+			/*
+			 * Convert value string from table entry to
+			 * internal representation. Only types actually
+			 * used for initial values are implemented here.
+			 */
+			switch (init_val->type) {
+			case ACPI_TYPE_METHOD:
+				obj_desc->method.param_count = (u8) ACPI_TO_INTEGER (val);
+				obj_desc->common.flags |= AOPOBJ_DATA_VALID;
+
+#if defined (_ACPI_ASL_COMPILER) || defined (_ACPI_DUMP_App)
+
+				/*
+				 * i_aSL Compiler cheats by putting parameter count
+				 * in the owner_iD
+				 */
+				new_node->owner_id = obj_desc->method.param_count;
+#else
+				/* Mark this as a very SPECIAL method */
+
+				obj_desc->method.method_flags = AML_METHOD_INTERNAL_ONLY;
+				obj_desc->method.implementation = acpi_ut_osi_implementation;
+#endif
+				break;
+
+			case ACPI_TYPE_INTEGER:
+
+				obj_desc->integer.value = ACPI_TO_INTEGER (val);
+				break;
+
+
+			case ACPI_TYPE_STRING:
+
+				/*
+				 * Build an object around the static string
+				 */
+				obj_desc->string.length = (u32) ACPI_STRLEN (val);
+				obj_desc->string.pointer = val;
+				obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
+				break;
+
+
+			case ACPI_TYPE_MUTEX:
+
+				obj_desc->mutex.node = new_node;
+				obj_desc->mutex.sync_level = (u8) (ACPI_TO_INTEGER (val) - 1);
+
+				if (ACPI_STRCMP (init_val->name, "_GL_") == 0) {
+					/*
+					 * Create a counting semaphore for the
+					 * global lock
+					 */
+					status = acpi_os_create_semaphore (ACPI_NO_UNIT_LIMIT,
+							 1, &obj_desc->mutex.semaphore);
+					if (ACPI_FAILURE (status)) {
+						acpi_ut_remove_reference (obj_desc);
+						goto unlock_and_exit;
+					}
+
+					/*
+					 * We just created the mutex for the
+					 * global lock, save it
+					 */
+					acpi_gbl_global_lock_semaphore = obj_desc->mutex.semaphore;
+				}
+				else {
+					/* Create a mutex */
+
+					status = acpi_os_create_semaphore (1, 1,
+							   &obj_desc->mutex.semaphore);
+					if (ACPI_FAILURE (status)) {
+						acpi_ut_remove_reference (obj_desc);
+						goto unlock_and_exit;
+					}
+				}
+				break;
+
+
+			default:
+
+				ACPI_REPORT_ERROR (("Unsupported initial type value %X\n",
+					init_val->type));
+				acpi_ut_remove_reference (obj_desc);
+				obj_desc = NULL;
+				continue;
+			}
+
+			/* Store pointer to value descriptor in the Node */
+
+			status = acpi_ns_attach_object (new_node, obj_desc,
+					 ACPI_GET_OBJECT_TYPE (obj_desc));
+
+			/* Remove local reference to the object */
+
+			acpi_ut_remove_reference (obj_desc);
+		}
+	}
+
+
+unlock_and_exit:
+	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+
+	/* Save a handle to "_GPE", it is always present */
+
+	if (ACPI_SUCCESS (status)) {
+		status = acpi_ns_get_node_by_path ("\\_GPE", NULL, ACPI_NS_NO_UPSEARCH,
+				  &acpi_gbl_fadt_gpe_device);
+	}
+
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ns_lookup
+ *
+ * PARAMETERS:  prefix_node     - Search scope if name is not fully qualified
+ *              Pathname        - Search pathname, in internal format
+ *                                (as represented in the AML stream)
+ *              Type            - Type associated with name
+ *              interpreter_mode - IMODE_LOAD_PASS2 => add name if not found
+ *              Flags           - Flags describing the search restrictions
+ *              walk_state      - Current state of the walk
+ *              return_node     - Where the Node is placed (if found
+ *                                or created successfully)
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Find or enter the passed name in the name space.
+ *              Log an error if name not found in Exec mode.
+ *
+ * MUTEX:       Assumes namespace is locked.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_lookup (
+	union acpi_generic_state        *scope_info,
+	char                            *pathname,
+	acpi_object_type                type,
+	acpi_interpreter_mode           interpreter_mode,
+	u32                             flags,
+	struct acpi_walk_state          *walk_state,
+	struct acpi_namespace_node      **return_node)
+{
+	acpi_status                     status;
+	char                            *path = pathname;
+	struct acpi_namespace_node      *prefix_node;
+	struct acpi_namespace_node      *current_node = NULL;
+	struct acpi_namespace_node      *this_node = NULL;
+	u32                             num_segments;
+	u32                             num_carats;
+	acpi_name                       simple_name;
+	acpi_object_type                type_to_check_for;
+	acpi_object_type                this_search_type;
+	u32                             search_parent_flag = ACPI_NS_SEARCH_PARENT;
+	u32                             local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND |
+			   ACPI_NS_SEARCH_PARENT);
+
+
+	ACPI_FUNCTION_TRACE ("ns_lookup");
+
+
+	if (!return_node) {
+		return_ACPI_STATUS (AE_BAD_PARAMETER);
+	}
+
+	acpi_gbl_ns_lookup_count++;
+	*return_node = ACPI_ENTRY_NOT_FOUND;
+
+	if (!acpi_gbl_root_node) {
+		return_ACPI_STATUS (AE_NO_NAMESPACE);
+	}
+
+	/*
+	 * Get the prefix scope.
+	 * A null scope means use the root scope
+	 */
+	if ((!scope_info) ||
+		(!scope_info->scope.node)) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+			"Null scope prefix, using root node (%p)\n",
+			acpi_gbl_root_node));
+
+		prefix_node = acpi_gbl_root_node;
+	}
+	else {
+		prefix_node = scope_info->scope.node;
+		if (ACPI_GET_DESCRIPTOR_TYPE (prefix_node) != ACPI_DESC_TYPE_NAMED) {
+			ACPI_REPORT_ERROR (("ns_lookup: %p is not a namespace node [%s]\n",
+					prefix_node, acpi_ut_get_descriptor_name (prefix_node)));
+			return_ACPI_STATUS (AE_AML_INTERNAL);
+		}
+
+		/*
+		 * This node might not be a actual "scope" node (such as a
+		 * Device/Method, etc.)  It could be a Package or other object node.
+		 * Backup up the tree to find the containing scope node.
+		 */
+		while (!acpi_ns_opens_scope (prefix_node->type) &&
+				prefix_node->type != ACPI_TYPE_ANY) {
+			prefix_node = acpi_ns_get_parent_node (prefix_node);
+		}
+	}
+
+	/* Save type   TBD: may be no longer necessary */
+
+	type_to_check_for = type;
+
+	/*
+	 * Begin examination of the actual pathname
+	 */
+	if (!pathname) {
+		/* A Null name_path is allowed and refers to the root */
+
+		num_segments = 0;
+		this_node    = acpi_gbl_root_node;
+		path     = "";
+
+		ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+			"Null Pathname (Zero segments), Flags=%X\n", flags));
+	}
+	else {
+		/*
+		 * Name pointer is valid (and must be in internal name format)
+		 *
+		 * Check for scope prefixes:
+		 *
+		 * As represented in the AML stream, a namepath consists of an
+		 * optional scope prefix followed by a name segment part.
+		 *
+		 * If present, the scope prefix is either a Root Prefix (in
+		 * which case the name is fully qualified), or one or more
+		 * Parent Prefixes (in which case the name's scope is relative
+		 * to the current scope).
+		 */
+		if (*path == (u8) AML_ROOT_PREFIX) {
+			/* Pathname is fully qualified, start from the root */
+
+			this_node = acpi_gbl_root_node;
+			search_parent_flag = ACPI_NS_NO_UPSEARCH;
+
+			/* Point to name segment part */
+
+			path++;
+
+			ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+				"Path is absolute from root [%p]\n", this_node));
+		}
+		else {
+			/* Pathname is relative to current scope, start there */
+
+			ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+				"Searching relative to prefix scope [%4.4s] (%p)\n",
+				acpi_ut_get_node_name (prefix_node), prefix_node));
+
+			/*
+			 * Handle multiple Parent Prefixes (carat) by just getting
+			 * the parent node for each prefix instance.
+			 */
+			this_node = prefix_node;
+			num_carats = 0;
+			while (*path == (u8) AML_PARENT_PREFIX) {
+				/* Name is fully qualified, no search rules apply */
+
+				search_parent_flag = ACPI_NS_NO_UPSEARCH;
+				/*
+				 * Point past this prefix to the name segment
+				 * part or the next Parent Prefix
+				 */
+				path++;
+
+				/* Backup to the parent node */
+
+				num_carats++;
+				this_node = acpi_ns_get_parent_node (this_node);
+				if (!this_node) {
+					/* Current scope has no parent scope */
+
+					ACPI_REPORT_ERROR (
+						("ACPI path has too many parent prefixes (^) - reached beyond root node\n"));
+					return_ACPI_STATUS (AE_NOT_FOUND);
+				}
+			}
+
+			if (search_parent_flag == ACPI_NS_NO_UPSEARCH) {
+				ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+					"Search scope is [%4.4s], path has %d carat(s)\n",
+					acpi_ut_get_node_name (this_node), num_carats));
+			}
+		}
+
+		/*
+		 * Determine the number of ACPI name segments in this pathname.
+		 *
+		 * The segment part consists of either:
+		 *  - A Null name segment (0)
+		 *  - A dual_name_prefix followed by two 4-byte name segments
+		 *  - A multi_name_prefix followed by a byte indicating the
+		 *      number of segments and the segments themselves.
+		 *  - A single 4-byte name segment
+		 *
+		 * Examine the name prefix opcode, if any, to determine the number of
+		 * segments.
+		 */
+		switch (*path) {
+		case 0:
+			/*
+			 * Null name after a root or parent prefixes. We already
+			 * have the correct target node and there are no name segments.
+			 */
+			num_segments = 0;
+			type = this_node->type;
+
+			ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+				"Prefix-only Pathname (Zero name segments), Flags=%X\n",
+				flags));
+			break;
+
+		case AML_DUAL_NAME_PREFIX:
+
+			/* More than one name_seg, search rules do not apply */
+
+			search_parent_flag = ACPI_NS_NO_UPSEARCH;
+
+			/* Two segments, point to first name segment */
+
+			num_segments = 2;
+			path++;
+
+			ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+				"Dual Pathname (2 segments, Flags=%X)\n", flags));
+			break;
+
+		case AML_MULTI_NAME_PREFIX_OP:
+
+			/* More than one name_seg, search rules do not apply */
+
+			search_parent_flag = ACPI_NS_NO_UPSEARCH;
+
+			/* Extract segment count, point to first name segment */
+
+			path++;
+			num_segments = (u32) (u8) *path;
+			path++;
+
+			ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+				"Multi Pathname (%d Segments, Flags=%X) \n",
+				num_segments, flags));
+			break;
+
+		default:
+			/*
+			 * Not a Null name, no Dual or Multi prefix, hence there is
+			 * only one name segment and Pathname is already pointing to it.
+			 */
+			num_segments = 1;
+
+			ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+				"Simple Pathname (1 segment, Flags=%X)\n", flags));
+			break;
+		}
+
+		ACPI_DEBUG_EXEC (acpi_ns_print_pathname (num_segments, path));
+	}
+
+
+	/*
+	 * Search namespace for each segment of the name.  Loop through and
+	 * verify (or add to the namespace) each name segment.
+	 *
+	 * The object type is significant only at the last name
+	 * segment.  (We don't care about the types along the path, only
+	 * the type of the final target object.)
+	 */
+	this_search_type = ACPI_TYPE_ANY;
+	current_node = this_node;
+	while (num_segments && current_node) {
+		num_segments--;
+		if (!num_segments) {
+			/*
+			 * This is the last segment, enable typechecking
+			 */
+			this_search_type = type;
+
+			/*
+			 * Only allow automatic parent search (search rules) if the caller
+			 * requested it AND we have a single, non-fully-qualified name_seg
+			 */
+			if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) &&
+				(flags & ACPI_NS_SEARCH_PARENT)) {
+				local_flags |= ACPI_NS_SEARCH_PARENT;
+			}
+
+			/* Set error flag according to caller */
+
+			if (flags & ACPI_NS_ERROR_IF_FOUND) {
+				local_flags |= ACPI_NS_ERROR_IF_FOUND;
+			}
+		}
+
+		/* Extract one ACPI name from the front of the pathname */
+
+		ACPI_MOVE_32_TO_32 (&simple_name, path);
+
+		/* Try to find the single (4 character) ACPI name */
+
+		status = acpi_ns_search_and_enter (simple_name, walk_state, current_node,
+				 interpreter_mode, this_search_type, local_flags, &this_node);
+		if (ACPI_FAILURE (status)) {
+			if (status == AE_NOT_FOUND) {
+				/* Name not found in ACPI namespace */
+
+				ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
+					"Name [%4.4s] not found in scope [%4.4s] %p\n",
+					(char *) &simple_name, (char *) &current_node->name,
+					current_node));
+			}
+
+			*return_node = this_node;
+			return_ACPI_STATUS (status);
+		}
+
+		/*
+		 * Sanity typecheck of the target object:
+		 *
+		 * If 1) This is the last segment (num_segments == 0)
+		 *    2) And we are looking for a specific type
+		 *       (Not checking for TYPE_ANY)
+		 *    3) Which is not an alias
+		 *    4) Which is not a local type (TYPE_SCOPE)
+		 *    5) And the type of target object is known (not TYPE_ANY)
+		 *    6) And target object does not match what we are looking for
+		 *
+		 * Then we have a type mismatch.  Just warn and ignore it.
+		 */
+		if ((num_segments       == 0)                               &&
+			(type_to_check_for  != ACPI_TYPE_ANY)                   &&
+			(type_to_check_for  != ACPI_TYPE_LOCAL_ALIAS)           &&
+			(type_to_check_for  != ACPI_TYPE_LOCAL_METHOD_ALIAS)    &&
+			(type_to_check_for  != ACPI_TYPE_LOCAL_SCOPE)           &&
+			(this_node->type    != ACPI_TYPE_ANY)                   &&
+			(this_node->type    != type_to_check_for)) {
+			/* Complain about a type mismatch */
+
+			ACPI_REPORT_WARNING (
+				("ns_lookup: Type mismatch on %4.4s (%s), searching for (%s)\n",
+				(char *) &simple_name, acpi_ut_get_type_name (this_node->type),
+				acpi_ut_get_type_name (type_to_check_for)));
+		}
+
+		/*
+		 * If this is the last name segment and we are not looking for a
+		 * specific type, but the type of found object is known, use that type
+		 * to see if it opens a scope.
+		 */
+		if ((num_segments == 0) && (type == ACPI_TYPE_ANY)) {
+			type = this_node->type;
+		}
+
+		/* Point to next name segment and make this node current */
+
+		path += ACPI_NAME_SIZE;
+		current_node = this_node;
+	}
+
+	/*
+	 * Always check if we need to open a new scope
+	 */
+	if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) {
+		/*
+		 * If entry is a type which opens a scope, push the new scope on the
+		 * scope stack.
+		 */
+		if (acpi_ns_opens_scope (type)) {
+			status = acpi_ds_scope_stack_push (this_node, type, walk_state);
+			if (ACPI_FAILURE (status)) {
+				return_ACPI_STATUS (status);
+			}
+		}
+	}
+
+	*return_node = this_node;
+	return_ACPI_STATUS (AE_OK);
+}
+