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466 lines
13 KiB
466 lines
13 KiB
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
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/******************************************************************************* |
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* |
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* Module Name: nsnames - Name manipulation and search |
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* |
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******************************************************************************/ |
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#include <acpi/acpi.h> |
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#include "accommon.h" |
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#include "amlcode.h" |
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#include "acnamesp.h" |
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#define _COMPONENT ACPI_NAMESPACE |
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ACPI_MODULE_NAME("nsnames") |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_get_external_pathname |
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* |
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* PARAMETERS: node - Namespace node whose pathname is needed |
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* |
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* RETURN: Pointer to storage containing the fully qualified name of |
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* the node, In external format (name segments separated by path |
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* separators.) |
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* |
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* DESCRIPTION: Used to obtain the full pathname to a namespace node, usually |
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* for error and debug statements. |
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* |
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******************************************************************************/ |
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char *acpi_ns_get_external_pathname(struct acpi_namespace_node *node) |
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{ |
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char *name_buffer; |
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ACPI_FUNCTION_TRACE_PTR(ns_get_external_pathname, node); |
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name_buffer = acpi_ns_get_normalized_pathname(node, FALSE); |
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return_PTR(name_buffer); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_get_pathname_length |
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* |
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* PARAMETERS: node - Namespace node |
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* |
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* RETURN: Length of path, including prefix |
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* |
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* DESCRIPTION: Get the length of the pathname string for this node |
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* |
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******************************************************************************/ |
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acpi_size acpi_ns_get_pathname_length(struct acpi_namespace_node *node) |
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{ |
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acpi_size size; |
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/* Validate the Node */ |
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if (ACPI_GET_DESCRIPTOR_TYPE(node) != ACPI_DESC_TYPE_NAMED) { |
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ACPI_ERROR((AE_INFO, |
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"Invalid/cached reference target node: %p, descriptor type %d", |
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node, ACPI_GET_DESCRIPTOR_TYPE(node))); |
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return (0); |
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} |
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size = acpi_ns_build_normalized_path(node, NULL, 0, FALSE); |
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return (size); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_handle_to_name |
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* |
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* PARAMETERS: target_handle - Handle of named object whose name is |
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* to be found |
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* buffer - Where the name is returned |
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* |
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* RETURN: Status, Buffer is filled with name if status is AE_OK |
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* |
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* DESCRIPTION: Build and return a full namespace name |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ns_handle_to_name(acpi_handle target_handle, struct acpi_buffer *buffer) |
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{ |
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acpi_status status; |
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struct acpi_namespace_node *node; |
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const char *node_name; |
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ACPI_FUNCTION_TRACE_PTR(ns_handle_to_name, target_handle); |
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node = acpi_ns_validate_handle(target_handle); |
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if (!node) { |
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return_ACPI_STATUS(AE_BAD_PARAMETER); |
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} |
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/* Validate/Allocate/Clear caller buffer */ |
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status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH); |
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if (ACPI_FAILURE(status)) { |
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return_ACPI_STATUS(status); |
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} |
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/* Just copy the ACPI name from the Node and zero terminate it */ |
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node_name = acpi_ut_get_node_name(node); |
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ACPI_COPY_NAMESEG(buffer->pointer, node_name); |
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((char *)buffer->pointer)[ACPI_NAMESEG_SIZE] = 0; |
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%4.4s\n", (char *)buffer->pointer)); |
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return_ACPI_STATUS(AE_OK); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_handle_to_pathname |
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* |
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* PARAMETERS: target_handle - Handle of named object whose name is |
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* to be found |
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* buffer - Where the pathname is returned |
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* no_trailing - Remove trailing '_' for each name |
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* segment |
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* |
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* RETURN: Status, Buffer is filled with pathname if status is AE_OK |
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* |
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* DESCRIPTION: Build and return a full namespace pathname |
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* |
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******************************************************************************/ |
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acpi_status |
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acpi_ns_handle_to_pathname(acpi_handle target_handle, |
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struct acpi_buffer *buffer, u8 no_trailing) |
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{ |
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acpi_status status; |
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struct acpi_namespace_node *node; |
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acpi_size required_size; |
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ACPI_FUNCTION_TRACE_PTR(ns_handle_to_pathname, target_handle); |
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node = acpi_ns_validate_handle(target_handle); |
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if (!node) { |
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return_ACPI_STATUS(AE_BAD_PARAMETER); |
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} |
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/* Determine size required for the caller buffer */ |
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required_size = |
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acpi_ns_build_normalized_path(node, NULL, 0, no_trailing); |
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if (!required_size) { |
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return_ACPI_STATUS(AE_BAD_PARAMETER); |
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} |
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/* Validate/Allocate/Clear caller buffer */ |
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status = acpi_ut_initialize_buffer(buffer, required_size); |
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if (ACPI_FAILURE(status)) { |
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return_ACPI_STATUS(status); |
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} |
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/* Build the path in the caller buffer */ |
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(void)acpi_ns_build_normalized_path(node, buffer->pointer, |
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(u32)required_size, no_trailing); |
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%s [%X]\n", |
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(char *)buffer->pointer, (u32) required_size)); |
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return_ACPI_STATUS(AE_OK); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_build_normalized_path |
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* |
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* PARAMETERS: node - Namespace node |
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* full_path - Where the path name is returned |
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* path_size - Size of returned path name buffer |
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* no_trailing - Remove trailing '_' from each name segment |
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* |
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* RETURN: Return 1 if the AML path is empty, otherwise returning (length |
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* of pathname + 1) which means the 'FullPath' contains a trailing |
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* null. |
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* |
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* DESCRIPTION: Build and return a full namespace pathname. |
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* Note that if the size of 'FullPath' isn't large enough to |
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* contain the namespace node's path name, the actual required |
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* buffer length is returned, and it should be greater than |
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* 'PathSize'. So callers are able to check the returning value |
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* to determine the buffer size of 'FullPath'. |
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* |
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******************************************************************************/ |
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u32 |
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acpi_ns_build_normalized_path(struct acpi_namespace_node *node, |
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char *full_path, u32 path_size, u8 no_trailing) |
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{ |
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u32 length = 0, i; |
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char name[ACPI_NAMESEG_SIZE]; |
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u8 do_no_trailing; |
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char c, *left, *right; |
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struct acpi_namespace_node *next_node; |
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ACPI_FUNCTION_TRACE_PTR(ns_build_normalized_path, node); |
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#define ACPI_PATH_PUT8(path, size, byte, length) \ |
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do { \ |
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if ((length) < (size)) \ |
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{ \ |
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(path)[(length)] = (byte); \ |
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} \ |
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(length)++; \ |
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} while (0) |
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/* |
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* Make sure the path_size is correct, so that we don't need to |
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* validate both full_path and path_size. |
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*/ |
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if (!full_path) { |
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path_size = 0; |
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} |
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if (!node) { |
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goto build_trailing_null; |
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} |
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next_node = node; |
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while (next_node && next_node != acpi_gbl_root_node) { |
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if (next_node != node) { |
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ACPI_PATH_PUT8(full_path, path_size, |
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AML_DUAL_NAME_PREFIX, length); |
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} |
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ACPI_MOVE_32_TO_32(name, &next_node->name); |
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do_no_trailing = no_trailing; |
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for (i = 0; i < 4; i++) { |
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c = name[4 - i - 1]; |
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if (do_no_trailing && c != '_') { |
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do_no_trailing = FALSE; |
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} |
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if (!do_no_trailing) { |
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ACPI_PATH_PUT8(full_path, path_size, c, length); |
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} |
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} |
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next_node = next_node->parent; |
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} |
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ACPI_PATH_PUT8(full_path, path_size, AML_ROOT_PREFIX, length); |
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/* Reverse the path string */ |
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if (length <= path_size) { |
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left = full_path; |
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right = full_path + length - 1; |
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while (left < right) { |
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c = *left; |
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*left++ = *right; |
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*right-- = c; |
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} |
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} |
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/* Append the trailing null */ |
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build_trailing_null: |
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ACPI_PATH_PUT8(full_path, path_size, '\0', length); |
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#undef ACPI_PATH_PUT8 |
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return_UINT32(length); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_get_normalized_pathname |
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* |
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* PARAMETERS: node - Namespace node whose pathname is needed |
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* no_trailing - Remove trailing '_' from each name segment |
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* |
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* RETURN: Pointer to storage containing the fully qualified name of |
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* the node, In external format (name segments separated by path |
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* separators.) |
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* |
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* DESCRIPTION: Used to obtain the full pathname to a namespace node, usually |
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* for error and debug statements. All trailing '_' will be |
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* removed from the full pathname if 'NoTrailing' is specified.. |
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* |
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******************************************************************************/ |
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char *acpi_ns_get_normalized_pathname(struct acpi_namespace_node *node, |
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u8 no_trailing) |
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{ |
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char *name_buffer; |
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acpi_size size; |
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ACPI_FUNCTION_TRACE_PTR(ns_get_normalized_pathname, node); |
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/* Calculate required buffer size based on depth below root */ |
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size = acpi_ns_build_normalized_path(node, NULL, 0, no_trailing); |
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if (!size) { |
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return_PTR(NULL); |
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} |
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/* Allocate a buffer to be returned to caller */ |
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name_buffer = ACPI_ALLOCATE_ZEROED(size); |
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if (!name_buffer) { |
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ACPI_ERROR((AE_INFO, "Could not allocate %u bytes", (u32)size)); |
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return_PTR(NULL); |
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} |
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/* Build the path in the allocated buffer */ |
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(void)acpi_ns_build_normalized_path(node, name_buffer, (u32)size, |
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no_trailing); |
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_NAMES, "%s: Path \"%s\"\n", |
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ACPI_GET_FUNCTION_NAME, name_buffer)); |
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return_PTR(name_buffer); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_build_prefixed_pathname |
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* |
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* PARAMETERS: prefix_scope - Scope/Path that prefixes the internal path |
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* internal_path - Name or path of the namespace node |
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* |
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* RETURN: None |
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* |
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* DESCRIPTION: Construct a fully qualified pathname from a concatenation of: |
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* 1) Path associated with the prefix_scope namespace node |
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* 2) External path representation of the Internal path |
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* |
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******************************************************************************/ |
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char *acpi_ns_build_prefixed_pathname(union acpi_generic_state *prefix_scope, |
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const char *internal_path) |
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{ |
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acpi_status status; |
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char *full_path = NULL; |
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char *external_path = NULL; |
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char *prefix_path = NULL; |
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acpi_size prefix_path_length = 0; |
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/* If there is a prefix, get the pathname to it */ |
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if (prefix_scope && prefix_scope->scope.node) { |
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prefix_path = |
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acpi_ns_get_normalized_pathname(prefix_scope->scope.node, |
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TRUE); |
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if (prefix_path) { |
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prefix_path_length = strlen(prefix_path); |
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} |
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} |
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status = acpi_ns_externalize_name(ACPI_UINT32_MAX, internal_path, |
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NULL, &external_path); |
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if (ACPI_FAILURE(status)) { |
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goto cleanup; |
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} |
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/* Merge the prefix path and the path. 2 is for one dot and trailing null */ |
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full_path = |
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ACPI_ALLOCATE_ZEROED(prefix_path_length + strlen(external_path) + |
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2); |
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if (!full_path) { |
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goto cleanup; |
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} |
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/* Don't merge if the External path is already fully qualified */ |
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if (prefix_path && (*external_path != '\\') && (*external_path != '^')) { |
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strcat(full_path, prefix_path); |
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if (prefix_path[1]) { |
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strcat(full_path, "."); |
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} |
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} |
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acpi_ns_normalize_pathname(external_path); |
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strcat(full_path, external_path); |
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cleanup: |
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if (prefix_path) { |
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ACPI_FREE(prefix_path); |
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} |
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if (external_path) { |
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ACPI_FREE(external_path); |
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} |
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return (full_path); |
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} |
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/******************************************************************************* |
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* |
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* FUNCTION: acpi_ns_normalize_pathname |
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* |
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* PARAMETERS: original_path - Path to be normalized, in External format |
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* |
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* RETURN: The original path is processed in-place |
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* |
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* DESCRIPTION: Remove trailing underscores from each element of a path. |
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* |
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* For example: \A___.B___.C___ becomes \A.B.C |
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* |
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******************************************************************************/ |
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void acpi_ns_normalize_pathname(char *original_path) |
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{ |
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char *input_path = original_path; |
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char *new_path_buffer; |
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char *new_path; |
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u32 i; |
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/* Allocate a temp buffer in which to construct the new path */ |
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new_path_buffer = ACPI_ALLOCATE_ZEROED(strlen(input_path) + 1); |
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new_path = new_path_buffer; |
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if (!new_path_buffer) { |
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return; |
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} |
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/* Special characters may appear at the beginning of the path */ |
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if (*input_path == '\\') { |
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*new_path = *input_path; |
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new_path++; |
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input_path++; |
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} |
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while (*input_path == '^') { |
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*new_path = *input_path; |
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new_path++; |
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input_path++; |
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} |
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/* Remainder of the path */ |
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while (*input_path) { |
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/* Do one nameseg at a time */ |
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for (i = 0; (i < ACPI_NAMESEG_SIZE) && *input_path; i++) { |
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if ((i == 0) || (*input_path != '_')) { /* First char is allowed to be underscore */ |
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*new_path = *input_path; |
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new_path++; |
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} |
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input_path++; |
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} |
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/* Dot means that there are more namesegs to come */ |
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if (*input_path == '.') { |
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*new_path = *input_path; |
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new_path++; |
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input_path++; |
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} |
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} |
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*new_path = 0; |
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strcpy(original_path, new_path_buffer); |
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ACPI_FREE(new_path_buffer); |
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}
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