| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds (pre-git) | 614 | 33.68% | 3 | 4.69% |
| Andy Grover | 418 | 22.93% | 11 | 17.19% |
| Robert Moore | 347 | 19.03% | 27 | 42.19% |
| Linus Torvalds | 183 | 10.04% | 4 | 6.25% |
| Erik Schmauss | 137 | 7.52% | 4 | 6.25% |
| Len Brown | 97 | 5.32% | 9 | 14.06% |
| Lv Zheng | 15 | 0.82% | 1 | 1.56% |
| Alexey Y. Starikovskiy | 4 | 0.22% | 1 | 1.56% |
| Lin Ming | 4 | 0.22% | 2 | 3.12% |
| Jung-uk Kim | 3 | 0.16% | 1 | 1.56% |
| Patrick Mochel | 1 | 0.05% | 1 | 1.56% |
| Total | 1823 | 64 |
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /******************************************************************************* * * Module Name: nsaccess - Top-level functions for accessing ACPI namespace * ******************************************************************************/ #include <acpi/acpi.h> #include "accommon.h" #include "amlcode.h" #include "acnamesp.h" #include "acdispat.h" #ifdef ACPI_ASL_COMPILER #include "acdisasm.h" #endif #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; struct acpi_namespace_node *prev_node = NULL; 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 predefined names in the name table */ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Entering predefined entries into namespace\n")); /* * Create the initial (default) namespace. * This namespace looks like something similar to this: * * ACPI Namespace (from Namespace Root): * 0 _GPE Scope 00203160 00 * 0 _PR_ Scope 002031D0 00 * 0 _SB_ Device 00203240 00 Notify Object: 0020ADD8 * 0 _SI_ Scope 002032B0 00 * 0 _TZ_ Device 00203320 00 * 0 _REV Integer 00203390 00 = 0000000000000002 * 0 _OS_ String 00203488 00 Len 14 "Microsoft Windows NT" * 0 _GL_ Mutex 00203580 00 Object 002035F0 * 0 _OSI Method 00203678 00 Args 1 Len 0000 Aml 00000000 */ for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) { status = AE_OK; /* _OSI is optional for now, will be permanent later */ if (!strcmp(init_val->name, "_OSI") && !acpi_gbl_create_osi_method) { continue; } /* * Create, init, and link the new predefined name * Note: No need to use acpi_ns_lookup here because all the * predefined names are at the root level. It is much easier to * just create and link the new node(s) here. */ new_node = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_namespace_node)); if (!new_node) { status = AE_NO_MEMORY; goto unlock_and_exit; } ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name); new_node->descriptor_type = ACPI_DESC_TYPE_NAMED; new_node->type = init_val->type; if (!prev_node) { acpi_gbl_root_node_struct.child = new_node; } else { prev_node->peer = new_node; } new_node->parent = &acpi_gbl_root_node_struct; prev_node = new_node; /* * 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_ERROR((AE_INFO, "Could not override predefined %s", 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) /* Save the parameter count for the iASL compiler */ new_node->value = obj_desc->method.param_count; #else /* Mark this as a very SPECIAL method (_OSI) */ obj_desc->method.info_flags = ACPI_METHOD_INTERNAL_ONLY; obj_desc->method.dispatch.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)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); /* Create a mutex */ status = acpi_os_create_mutex(&obj_desc->mutex. os_mutex); if (ACPI_FAILURE(status)) { acpi_ut_remove_reference(obj_desc); goto unlock_and_exit; } /* Special case for ACPI Global Lock */ if (strcmp(init_val->name, "_GL_") == 0) { acpi_gbl_global_lock_mutex = obj_desc; /* Create additional counting semaphore for global lock */ status = acpi_os_create_semaphore(1, 0, &acpi_gbl_global_lock_semaphore); if (ACPI_FAILURE(status)) { acpi_ut_remove_reference (obj_desc); goto unlock_and_exit; } } break; default: ACPI_ERROR((AE_INFO, "Unsupported initial type value 0x%X", 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, obj_desc->common.type); /* 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(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH, &acpi_gbl_fadt_gpe_device); } return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ns_lookup * * PARAMETERS: scope_info - Current scope info block * 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; char *external_path; 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; acpi_interpreter_mode local_interpreter_mode; ACPI_FUNCTION_TRACE(ns_lookup); if (!return_node) { return_ACPI_STATUS(AE_BAD_PARAMETER); } local_flags = flags & ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND | ACPI_NS_SEARCH_PARENT); *return_node = ACPI_ENTRY_NOT_FOUND; acpi_gbl_ns_lookup_count++; 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_ERROR((AE_INFO, "%p is not a namespace node [%s]", prefix_node, acpi_ut_get_descriptor_name(prefix_node))); return_ACPI_STATUS(AE_AML_INTERNAL); } if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) { /* * 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 = prefix_node->parent; } } } /* 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 = this_node->parent; if (!this_node) { /* * Current scope has no parent scope. Externalize * the internal path for error message. */ status = acpi_ns_externalize_name (ACPI_UINT32_MAX, pathname, NULL, &external_path); if (ACPI_SUCCESS(status)) { ACPI_ERROR((AE_INFO, "%s: Path has too many parent prefixes (^)", external_path)); ACPI_FREE(external_path); } 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 %u 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: /* 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 (%u 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; } /* Set override flag according to caller */ if (flags & ACPI_NS_OVERRIDE_IF_FOUND) { local_flags |= ACPI_NS_OVERRIDE_IF_FOUND; } } /* Handle opcodes that create a new name_seg via a full name_path */ local_interpreter_mode = interpreter_mode; if ((flags & ACPI_NS_PREFIX_MUST_EXIST) && (num_segments > 0)) { /* Every element of the path must exist (except for the final name_seg) */ local_interpreter_mode = ACPI_IMODE_EXECUTE; } /* 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, local_interpreter_mode, this_search_type, local_flags, &this_node); if (ACPI_FAILURE(status)) { if (status == AE_NOT_FOUND) { #if !defined ACPI_ASL_COMPILER /* Note: iASL reports this error by itself, not needed here */ if (flags & ACPI_NS_PREFIX_MUST_EXIST) { acpi_os_printf(ACPI_MSG_BIOS_ERROR "Object does not exist: %4.4s\n", (char *)&simple_name); } #endif /* 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)); } #ifdef ACPI_EXEC_APP if ((status == AE_ALREADY_EXISTS) && (this_node->flags & ANOBJ_NODE_EARLY_INIT)) { this_node->flags &= ~ANOBJ_NODE_EARLY_INIT; status = AE_OK; } #endif #ifdef ACPI_ASL_COMPILER /* * If this ACPI name already exists within the namespace as an * external declaration, then mark the external as a conflicting * declaration and proceed to process the current node as if it did * not exist in the namespace. If this node is not processed as * normal, then it could cause improper namespace resolution * by failing to open a new scope. */ if (acpi_gbl_disasm_flag && (status == AE_ALREADY_EXISTS) && ((this_node->flags & ANOBJ_IS_EXTERNAL) || (walk_state && walk_state->opcode == AML_EXTERNAL_OP))) { this_node->flags &= ~ANOBJ_IS_EXTERNAL; this_node->type = (u8)this_search_type; if (walk_state->opcode != AML_EXTERNAL_OP) { acpi_dm_mark_external_conflict (this_node); } break; } #endif *return_node = this_node; return_ACPI_STATUS(status); } /* More segments to follow? */ if (num_segments > 0) { /* * If we have an alias to an object that opens a scope (such as a * device or processor), we need to dereference the alias here so * that we can access any children of the original node (via the * remaining segments). */ if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) { if (!this_node->object) { return_ACPI_STATUS(AE_NOT_EXIST); } if (acpi_ns_opens_scope (((struct acpi_namespace_node *) this_node->object)->type)) { this_node = (struct acpi_namespace_node *) this_node->object; } } } /* Special handling for the last segment (num_segments == 0) */ else { /* * 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 ((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_WARNING((AE_INFO, "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)", ACPI_CAST_PTR(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 (later) see if it opens a scope. */ if (type == ACPI_TYPE_ANY) { type = this_node->type; } } /* Point to next name segment and make this node current */ path += ACPI_NAMESEG_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); } } } #ifdef ACPI_EXEC_APP if (flags & ACPI_NS_EARLY_INIT) { this_node->flags |= ANOBJ_NODE_EARLY_INIT; } #endif *return_node = this_node; return_ACPI_STATUS(AE_OK); }
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