/****************************************************************************** * * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing * parents and siblings and Scope manipulation * *****************************************************************************/ /* * Copyright (C) 2000 - 2012, Intel Corp. * 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 #include "accommon.h" #include "acnamesp.h" #include "amlcode.h" #define _COMPONENT ACPI_NAMESPACE ACPI_MODULE_NAME("nsutils") /* Local prototypes */ #ifdef ACPI_OBSOLETE_FUNCTIONS acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search); #endif /******************************************************************************* * * FUNCTION: acpi_ns_print_node_pathname * * PARAMETERS: node - Object * message - Prefix message * * DESCRIPTION: Print an object's full namespace pathname * Manages allocation/freeing of a pathname buffer * ******************************************************************************/ void acpi_ns_print_node_pathname(struct acpi_namespace_node *node, const char *message) { struct acpi_buffer buffer; acpi_status status; if (!node) { acpi_os_printf("[NULL NAME]"); return; } /* Convert handle to full pathname and print it (with supplied message) */ buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER; status = acpi_ns_handle_to_pathname(node, &buffer); if (ACPI_SUCCESS(status)) { if (message) { acpi_os_printf("%s ", message); } acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node); ACPI_FREE(buffer.pointer); } } /******************************************************************************* * * FUNCTION: acpi_ns_get_type * * PARAMETERS: node - Parent Node to be examined * * RETURN: Type field from Node whose handle is passed * * DESCRIPTION: Return the type of a Namespace node * ******************************************************************************/ acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node) { ACPI_FUNCTION_TRACE(ns_get_type); if (!node) { ACPI_WARNING((AE_INFO, "Null Node parameter")); return_UINT32(ACPI_TYPE_ANY); } return_UINT32((acpi_object_type) node->type); } /******************************************************************************* * * FUNCTION: acpi_ns_local * * PARAMETERS: type - A namespace object type * * RETURN: LOCAL if names must be found locally in objects of the * passed type, 0 if enclosing scopes should be searched * * DESCRIPTION: Returns scope rule for the given object type. * ******************************************************************************/ u32 acpi_ns_local(acpi_object_type type) { ACPI_FUNCTION_TRACE(ns_local); if (!acpi_ut_valid_object_type(type)) { /* Type code out of range */ ACPI_WARNING((AE_INFO, "Invalid Object Type 0x%X", type)); return_UINT32(ACPI_NS_NORMAL); } return_UINT32((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL); } /******************************************************************************* * * FUNCTION: acpi_ns_get_internal_name_length * * PARAMETERS: info - Info struct initialized with the * external name pointer. * * RETURN: None * * DESCRIPTION: Calculate the length of the internal (AML) namestring * corresponding to the external (ASL) namestring. * ******************************************************************************/ void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info) { const char *next_external_char; u32 i; ACPI_FUNCTION_ENTRY(); next_external_char = info->external_name; info->num_carats = 0; info->num_segments = 0; info->fully_qualified = FALSE; /* * For the internal name, the required length is 4 bytes per segment, plus * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null * (which is not really needed, but no there's harm in putting it there) * * strlen() + 1 covers the first name_seg, which has no path separator */ if (ACPI_IS_ROOT_PREFIX(*next_external_char)) { info->fully_qualified = TRUE; next_external_char++; /* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */ while (ACPI_IS_ROOT_PREFIX(*next_external_char)) { next_external_char++; } } else { /* Handle Carat prefixes */ while (ACPI_IS_PARENT_PREFIX(*next_external_char)) { info->num_carats++; next_external_char++; } } /* * Determine the number of ACPI name "segments" by counting the number of * path separators within the string. Start with one segment since the * segment count is [(# separators) + 1], and zero separators is ok. */ if (*next_external_char) { info->num_segments = 1; for (i = 0; next_external_char[i]; i++) { if (ACPI_IS_PATH_SEPARATOR(next_external_char[i])) { info->num_segments++; } } } info->length = (ACPI_NAME_SIZE * info->num_segments) + 4 + info->num_carats; info->next_external_char = next_external_char; } /******************************************************************************* * * FUNCTION: acpi_ns_build_internal_name * * PARAMETERS: info - Info struct fully initialized * * RETURN: Status * * DESCRIPTION: Construct the internal (AML) namestring * corresponding to the external (ASL) namestring. * ******************************************************************************/ acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info) { u32 num_segments = info->num_segments; char *internal_name = info->internal_name; const char *external_name = info->next_external_char; char *result = NULL; u32 i; ACPI_FUNCTION_TRACE(ns_build_internal_name); /* Setup the correct prefixes, counts, and pointers */ if (info->fully_qualified) { internal_name[0] = AML_ROOT_PREFIX; if (num_segments <= 1) { result = &internal_name[1]; } else if (num_segments == 2) { internal_name[1] = AML_DUAL_NAME_PREFIX; result = &internal_name[2]; } else { internal_name[1] = AML_MULTI_NAME_PREFIX_OP; internal_name[2] = (char)num_segments; result = &internal_name[3]; } } else { /* * Not fully qualified. * Handle Carats first, then append the name segments */ i = 0; if (info->num_carats) { for (i = 0; i < info->num_carats; i++) { internal_name[i] = AML_PARENT_PREFIX; } } if (num_segments <= 1) { result = &internal_name[i]; } else if (num_segments == 2) { internal_name[i] = AML_DUAL_NAME_PREFIX; result = &internal_name[(acpi_size) i + 1]; } else { internal_name[i] = AML_MULTI_NAME_PREFIX_OP; internal_name[(acpi_size) i + 1] = (char)num_segments; result = &internal_name[(acpi_size) i + 2]; } } /* Build the name (minus path separators) */ for (; num_segments; num_segments--) { for (i = 0; i < ACPI_NAME_SIZE; i++) { if (ACPI_IS_PATH_SEPARATOR(*external_name) || (*external_name == 0)) { /* Pad the segment with underscore(s) if segment is short */ result[i] = '_'; } else { /* Convert the character to uppercase and save it */ result[i] = (char)ACPI_TOUPPER((int)*external_name); external_name++; } } /* Now we must have a path separator, or the pathname is bad */ if (!ACPI_IS_PATH_SEPARATOR(*external_name) && (*external_name != 0)) { return_ACPI_STATUS(AE_BAD_PATHNAME); } /* Move on the next segment */ external_name++; result += ACPI_NAME_SIZE; } /* Terminate the string */ *result = 0; if (info->fully_qualified) { ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (abs) \"\\%s\"\n", internal_name, internal_name)); } else { ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n", internal_name, internal_name)); } return_ACPI_STATUS(AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ns_internalize_name * * PARAMETERS: *external_name - External representation of name * **Converted name - Where to return the resulting * internal represention of the name * * RETURN: Status * * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0") * to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30) * *******************************************************************************/ acpi_status acpi_ns_internalize_name(const char *external_name, char **converted_name) { char *internal_name; struct acpi_namestring_info info; acpi_status status; ACPI_FUNCTION_TRACE(ns_internalize_name); if ((!external_name) || (*external_name == 0) || (!converted_name)) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Get the length of the new internal name */ info.external_name = external_name; acpi_ns_get_internal_name_length(&info); /* We need a segment to store the internal name */ internal_name = ACPI_ALLOCATE_ZEROED(info.length); if (!internal_name) { return_ACPI_STATUS(AE_NO_MEMORY); } /* Build the name */ info.internal_name = internal_name; status = acpi_ns_build_internal_name(&info); if (ACPI_FAILURE(status)) { ACPI_FREE(internal_name); return_ACPI_STATUS(status); } *converted_name = internal_name; return_ACPI_STATUS(AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ns_externalize_name * * PARAMETERS: internal_name_length - Lenth of the internal name below * internal_name - Internal representation of name * converted_name_length - Where the length is returned * converted_name - Where the resulting external name * is returned * * RETURN: Status * * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30) * to its external (printable) form (e.g. "\_PR_.CPU0") * ******************************************************************************/ acpi_status acpi_ns_externalize_name(u32 internal_name_length, const char *internal_name, u32 * converted_name_length, char **converted_name) { u32 names_index = 0; u32 num_segments = 0; u32 required_length; u32 prefix_length = 0; u32 i = 0; u32 j = 0; ACPI_FUNCTION_TRACE(ns_externalize_name); if (!internal_name_length || !internal_name || !converted_name) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Check for a prefix (one '\' | one or more '^') */ switch (internal_name[0]) { case AML_ROOT_PREFIX: prefix_length = 1; break; case AML_PARENT_PREFIX: for (i = 0; i < internal_name_length; i++) { if (ACPI_IS_PARENT_PREFIX(internal_name[i])) { prefix_length = i + 1; } else { break; } } if (i == internal_name_length) { prefix_length = i; } break; default: break; } /* * Check for object names. Note that there could be 0-255 of these * 4-byte elements. */ if (prefix_length < internal_name_length) { switch (internal_name[prefix_length]) { case AML_MULTI_NAME_PREFIX_OP: /* 4-byte names */ names_index = prefix_length + 2; num_segments = (u8) internal_name[(acpi_size) prefix_length + 1]; break; case AML_DUAL_NAME_PREFIX: /* Two 4-byte names */ names_index = prefix_length + 1; num_segments = 2; break; case 0: /* null_name */ names_index = 0; num_segments = 0; break; default: /* one 4-byte name */ names_index = prefix_length; num_segments = 1; break; } } /* * Calculate the length of converted_name, which equals the length * of the prefix, length of all object names, length of any required * punctuation ('.') between object names, plus the NULL terminator. */ required_length = prefix_length + (4 * num_segments) + ((num_segments > 0) ? (num_segments - 1) : 0) + 1; /* * Check to see if we're still in bounds. If not, there's a problem * with internal_name (invalid format). */ if (required_length > internal_name_length) { ACPI_ERROR((AE_INFO, "Invalid internal name")); return_ACPI_STATUS(AE_BAD_PATHNAME); } /* Build the converted_name */ *converted_name = ACPI_ALLOCATE_ZEROED(required_length); if (!(*converted_name)) { return_ACPI_STATUS(AE_NO_MEMORY); } j = 0; for (i = 0; i < prefix_length; i++) { (*converted_name)[j++] = internal_name[i]; } if (num_segments > 0) { for (i = 0; i < num_segments; i++) { if (i > 0) { (*converted_name)[j++] = '.'; } /* Copy and validate the 4-char name segment */ ACPI_MOVE_NAME(&(*converted_name)[j], &internal_name[names_index]); acpi_ut_repair_name(&(*converted_name)[j]); j += ACPI_NAME_SIZE; names_index += ACPI_NAME_SIZE; } } if (converted_name_length) { *converted_name_length = (u32) required_length; } return_ACPI_STATUS(AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ns_validate_handle * * PARAMETERS: handle - Handle to be validated and typecast to a * namespace node. * * RETURN: A pointer to a namespace node * * DESCRIPTION: Convert a namespace handle to a namespace node. Handles special * cases for the root node. * * NOTE: Real integer handles would allow for more verification * and keep all pointers within this subsystem - however this introduces * more overhead and has not been necessary to this point. Drivers * holding handles are typically notified before a node becomes invalid * due to a table unload. * ******************************************************************************/ struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle) { ACPI_FUNCTION_ENTRY(); /* Parameter validation */ if ((!handle) || (handle == ACPI_ROOT_OBJECT)) { return (acpi_gbl_root_node); } /* We can at least attempt to verify the handle */ if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) { return (NULL); } return (ACPI_CAST_PTR(struct acpi_namespace_node, handle)); } /******************************************************************************* * * FUNCTION: acpi_ns_terminate * * PARAMETERS: none * * RETURN: none * * DESCRIPTION: free memory allocated for namespace and ACPI table storage. * ******************************************************************************/ void acpi_ns_terminate(void) { union acpi_operand_object *obj_desc; ACPI_FUNCTION_TRACE(ns_terminate); /* * 1) Free the entire namespace -- all nodes and objects * * Delete all object descriptors attached to namepsace nodes */ acpi_ns_delete_namespace_subtree(acpi_gbl_root_node); /* Detach any objects attached to the root */ obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node); if (obj_desc) { acpi_ns_detach_object(acpi_gbl_root_node); } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n")); return_VOID; } /******************************************************************************* * * FUNCTION: acpi_ns_opens_scope * * PARAMETERS: type - A valid namespace type * * RETURN: NEWSCOPE if the passed type "opens a name scope" according * to the ACPI specification, else 0 * ******************************************************************************/ u32 acpi_ns_opens_scope(acpi_object_type type) { ACPI_FUNCTION_ENTRY(); if (type > ACPI_TYPE_LOCAL_MAX) { /* type code out of range */ ACPI_WARNING((AE_INFO, "Invalid Object Type 0x%X", type)); return (ACPI_NS_NORMAL); } return (((u32)acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE); } /******************************************************************************* * * FUNCTION: acpi_ns_get_node * * PARAMETERS: *pathname - Name to be found, in external (ASL) format. The * \ (backslash) and ^ (carat) prefixes, and the * . (period) to separate segments are supported. * prefix_node - Root of subtree to be searched, or NS_ALL for the * root of the name space. If Name is fully * qualified (first s8 is '\'), the passed value * of Scope will not be accessed. * flags - Used to indicate whether to perform upsearch or * not. * return_node - Where the Node is returned * * DESCRIPTION: Look up a name relative to a given scope and return the * corresponding Node. NOTE: Scope can be null. * * MUTEX: Locks namespace * ******************************************************************************/ acpi_status acpi_ns_get_node(struct acpi_namespace_node *prefix_node, const char *pathname, u32 flags, struct acpi_namespace_node **return_node) { union acpi_generic_state scope_info; acpi_status status; char *internal_path; ACPI_FUNCTION_TRACE_PTR(ns_get_node, ACPI_CAST_PTR(char, pathname)); if (!pathname) { *return_node = prefix_node; if (!prefix_node) { *return_node = acpi_gbl_root_node; } return_ACPI_STATUS(AE_OK); } /* Convert path to internal representation */ status = acpi_ns_internalize_name(pathname, &internal_path); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Must lock namespace during lookup */ status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); if (ACPI_FAILURE(status)) { goto cleanup; } /* Setup lookup scope (search starting point) */ scope_info.scope.node = prefix_node; /* Lookup the name in the namespace */ status = acpi_ns_lookup(&scope_info, internal_path, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, (flags | ACPI_NS_DONT_OPEN_SCOPE), NULL, return_node); if (ACPI_FAILURE(status)) { ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%s, %s\n", pathname, acpi_format_exception(status))); } (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); cleanup: ACPI_FREE(internal_path); return_ACPI_STATUS(status); }