--- /dev/null
+/*******************************************************************************
+ *
+ * Module Name: nsnames - Name manipulation and search
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2015, 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 <acpi/acpi.h>
+#include "accommon.h"
+#include "amlcode.h"
+#include "acnamesp.h"
+
+#define _COMPONENT ACPI_NAMESPACE
+ACPI_MODULE_NAME("nsnames")
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_build_external_path
+ *
+ * PARAMETERS: node - NS node whose pathname is needed
+ * size - Size of the pathname
+ * *name_buffer - Where to return the pathname
+ *
+ * RETURN: Status
+ * Places the pathname into the name_buffer, in external format
+ * (name segments separated by path separators)
+ *
+ * DESCRIPTION: Generate a full pathaname
+ *
+ ******************************************************************************/
+acpi_status
+acpi_ns_build_external_path(struct acpi_namespace_node *node,
+ acpi_size size, char *name_buffer)
+{
+ acpi_size index;
+ struct acpi_namespace_node *parent_node;
+
+ ACPI_FUNCTION_ENTRY();
+
+ /* Special case for root */
+
+ index = size - 1;
+ if (index < ACPI_NAME_SIZE) {
+ name_buffer[0] = AML_ROOT_PREFIX;
+ name_buffer[1] = 0;
+ return (AE_OK);
+ }
+
+ /* Store terminator byte, then build name backwards */
+
+ parent_node = node;
+ name_buffer[index] = 0;
+
+ while ((index > ACPI_NAME_SIZE) && (parent_node != acpi_gbl_root_node)) {
+ index -= ACPI_NAME_SIZE;
+
+ /* Put the name into the buffer */
+
+ ACPI_MOVE_32_TO_32((name_buffer + index), &parent_node->name);
+ parent_node = parent_node->parent;
+
+ /* Prefix name with the path separator */
+
+ index--;
+ name_buffer[index] = ACPI_PATH_SEPARATOR;
+ }
+
+ /* Overwrite final separator with the root prefix character */
+
+ name_buffer[index] = AML_ROOT_PREFIX;
+
+ if (index != 0) {
+ ACPI_ERROR((AE_INFO,
+ "Could not construct external pathname; index=%u, size=%u, Path=%s",
+ (u32) index, (u32) size, &name_buffer[size]));
+
+ return (AE_BAD_PARAMETER);
+ }
+
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_get_external_pathname
+ *
+ * PARAMETERS: node - Namespace node whose pathname is needed
+ *
+ * RETURN: Pointer to storage containing the fully qualified name of
+ * the node, In external format (name segments separated by path
+ * separators.)
+ *
+ * DESCRIPTION: Used to obtain the full pathname to a namespace node, usually
+ * for error and debug statements.
+ *
+ ******************************************************************************/
+
+char *acpi_ns_get_external_pathname(struct acpi_namespace_node *node)
+{
+ acpi_status status;
+ char *name_buffer;
+ acpi_size size;
+
+ ACPI_FUNCTION_TRACE_PTR(ns_get_external_pathname, node);
+
+ /* Calculate required buffer size based on depth below root */
+
+ size = acpi_ns_get_pathname_length(node);
+ if (!size) {
+ return_PTR(NULL);
+ }
+
+ /* Allocate a buffer to be returned to caller */
+
+ name_buffer = ACPI_ALLOCATE_ZEROED(size);
+ if (!name_buffer) {
+ ACPI_ERROR((AE_INFO, "Could not allocate %u bytes", (u32)size));
+ return_PTR(NULL);
+ }
+
+ /* Build the path in the allocated buffer */
+
+ status = acpi_ns_build_external_path(node, size, name_buffer);
+ if (ACPI_FAILURE(status)) {
+ ACPI_FREE(name_buffer);
+ return_PTR(NULL);
+ }
+
+ return_PTR(name_buffer);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_get_pathname_length
+ *
+ * PARAMETERS: node - Namespace node
+ *
+ * RETURN: Length of path, including prefix
+ *
+ * DESCRIPTION: Get the length of the pathname string for this node
+ *
+ ******************************************************************************/
+
+acpi_size acpi_ns_get_pathname_length(struct acpi_namespace_node *node)
+{
+ acpi_size size;
+ struct acpi_namespace_node *next_node;
+
+ ACPI_FUNCTION_ENTRY();
+
+ /*
+ * Compute length of pathname as 5 * number of name segments.
+ * Go back up the parent tree to the root
+ */
+ size = 0;
+ next_node = node;
+
+ while (next_node && (next_node != acpi_gbl_root_node)) {
+ if (ACPI_GET_DESCRIPTOR_TYPE(next_node) != ACPI_DESC_TYPE_NAMED) {
+ ACPI_ERROR((AE_INFO,
+ "Invalid Namespace Node (%p) while traversing namespace",
+ next_node));
+ return (0);
+ }
+ size += ACPI_PATH_SEGMENT_LENGTH;
+ next_node = next_node->parent;
+ }
+
+ if (!size) {
+ size = 1; /* Root node case */
+ }
+
+ return (size + 1); /* +1 for null string terminator */
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_handle_to_pathname
+ *
+ * PARAMETERS: target_handle - Handle of named object whose name is
+ * to be found
+ * buffer - Where the pathname is returned
+ *
+ * RETURN: Status, Buffer is filled with pathname if status is AE_OK
+ *
+ * DESCRIPTION: Build and return a full namespace pathname
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_handle_to_pathname(acpi_handle target_handle,
+ struct acpi_buffer * buffer)
+{
+ acpi_status status;
+ struct acpi_namespace_node *node;
+ acpi_size required_size;
+
+ ACPI_FUNCTION_TRACE_PTR(ns_handle_to_pathname, target_handle);
+
+ node = acpi_ns_validate_handle(target_handle);
+ if (!node) {
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
+ }
+
+ /* Determine size required for the caller buffer */
+
+ required_size = acpi_ns_get_pathname_length(node);
+ if (!required_size) {
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
+ }
+
+ /* Validate/Allocate/Clear caller buffer */
+
+ status = acpi_ut_initialize_buffer(buffer, required_size);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Build the path in the caller buffer */
+
+ status =
+ acpi_ns_build_external_path(node, required_size, buffer->pointer);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%s [%X]\n",
+ (char *)buffer->pointer, (u32) required_size));
+ return_ACPI_STATUS(AE_OK);
+}
Code Review / kvmfornfv.git / blobdiff