diff options
Diffstat (limited to 'drivers/acpi/namespace/nsaccess.c')
| -rw-r--r-- | drivers/acpi/namespace/nsaccess.c | 637 |
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 000000000000..1c0c12336c57 --- /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 *) ¤t_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); +} + |
