0,0 → 1,303 |
/******************************************************************************* |
* |
* 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_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) |
{ |
char *name_buffer; |
|
ACPI_FUNCTION_TRACE_PTR(ns_get_external_pathname, node); |
|
name_buffer = acpi_ns_get_normalized_pathname(node, FALSE); |
|
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; |
|
ACPI_FUNCTION_ENTRY(); |
|
size = acpi_ns_build_normalized_path(node, NULL, 0, FALSE); |
|
return (size); |
} |
|
/******************************************************************************* |
* |
* 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 |
* no_trailing - Remove trailing '_' for each name |
* segment |
* |
* 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, u8 no_trailing) |
{ |
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_build_normalized_path(node, NULL, 0, no_trailing); |
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 */ |
|
(void)acpi_ns_build_normalized_path(node, buffer->pointer, |
required_size, no_trailing); |
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); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ns_build_normalized_path |
* |
* PARAMETERS: node - Namespace node |
* full_path - Where the path name is returned |
* path_size - Size of returned path name buffer |
* no_trailing - Remove trailing '_' from each name segment |
* |
* RETURN: Return 1 if the AML path is empty, otherwise returning (length |
* of pathname + 1) which means the 'FullPath' contains a trailing |
* null. |
* |
* DESCRIPTION: Build and return a full namespace pathname. |
* Note that if the size of 'FullPath' isn't large enough to |
* contain the namespace node's path name, the actual required |
* buffer length is returned, and it should be greater than |
* 'PathSize'. So callers are able to check the returning value |
* to determine the buffer size of 'FullPath'. |
* |
******************************************************************************/ |
|
u32 |
acpi_ns_build_normalized_path(struct acpi_namespace_node *node, |
char *full_path, u32 path_size, u8 no_trailing) |
{ |
u32 length = 0, i; |
char name[ACPI_NAME_SIZE]; |
u8 do_no_trailing; |
char c, *left, *right; |
struct acpi_namespace_node *next_node; |
|
ACPI_FUNCTION_TRACE_PTR(ns_build_normalized_path, node); |
|
#define ACPI_PATH_PUT8(path, size, byte, length) \ |
do { \ |
if ((length) < (size)) \ |
{ \ |
(path)[(length)] = (byte); \ |
} \ |
(length)++; \ |
} while (0) |
|
/* |
* Make sure the path_size is correct, so that we don't need to |
* validate both full_path and path_size. |
*/ |
if (!full_path) { |
path_size = 0; |
} |
|
if (!node) { |
goto build_trailing_null; |
} |
|
next_node = node; |
while (next_node && next_node != acpi_gbl_root_node) { |
if (next_node != node) { |
ACPI_PATH_PUT8(full_path, path_size, |
AML_DUAL_NAME_PREFIX, length); |
} |
ACPI_MOVE_32_TO_32(name, &next_node->name); |
do_no_trailing = no_trailing; |
for (i = 0; i < 4; i++) { |
c = name[4 - i - 1]; |
if (do_no_trailing && c != '_') { |
do_no_trailing = FALSE; |
} |
if (!do_no_trailing) { |
ACPI_PATH_PUT8(full_path, path_size, c, length); |
} |
} |
next_node = next_node->parent; |
} |
ACPI_PATH_PUT8(full_path, path_size, AML_ROOT_PREFIX, length); |
|
/* Reverse the path string */ |
|
if (length <= path_size) { |
left = full_path; |
right = full_path + length - 1; |
while (left < right) { |
c = *left; |
*left++ = *right; |
*right-- = c; |
} |
} |
|
/* Append the trailing null */ |
|
build_trailing_null: |
ACPI_PATH_PUT8(full_path, path_size, '\0', length); |
|
#undef ACPI_PATH_PUT8 |
|
return_UINT32(length); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_ns_get_normalized_pathname |
* |
* PARAMETERS: node - Namespace node whose pathname is needed |
* no_trailing - Remove trailing '_' from each name segment |
* |
* 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. All trailing '_' will be |
* removed from the full pathname if 'NoTrailing' is specified.. |
* |
******************************************************************************/ |
|
char *acpi_ns_get_normalized_pathname(struct acpi_namespace_node *node, |
u8 no_trailing) |
{ |
char *name_buffer; |
acpi_size size; |
|
ACPI_FUNCTION_TRACE_PTR(ns_get_normalized_pathname, node); |
|
/* Calculate required buffer size based on depth below root */ |
|
size = acpi_ns_build_normalized_path(node, NULL, 0, no_trailing); |
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 */ |
|
(void)acpi_ns_build_normalized_path(node, name_buffer, size, |
no_trailing); |
|
return_PTR(name_buffer); |
} |