1 /*******************************************************************************
3 * Module Name: utresrc - Resource management utilities
5 ******************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
12 * All rights reserved.
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
37 * The above copyright and patent license is granted only if the following
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
72 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
80 * 4. Disclaimer and Export Compliance
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
114 *****************************************************************************
116 * Alternatively, you may choose to be licensed under the terms of the
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
122 * 1. Redistributions of source code must retain the above copyright
123 * notice, this list of conditions, and the following disclaimer,
124 * without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 * substantially similar to the "NO WARRANTY" disclaimer below
127 * ("Disclaimer") and any redistribution must be conditioned upon
128 * including a substantially similar Disclaimer requirement for further
129 * binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 * of any contributors may be used to endorse or promote products derived
132 * from this software without specific prior written permission.
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
150 *****************************************************************************/
153 #include "accommon.h"
157 #define _COMPONENT ACPI_UTILITIES
158 ACPI_MODULE_NAME ("utresrc")
162 * Base sizes of the raw AML resource descriptors, indexed by resource type.
163 * Zero indicates a reserved (and therefore invalid) resource type.
165 const UINT8 AcpiGbl_ResourceAmlSizes
[] =
167 /* Small descriptors */
173 ACPI_AML_SIZE_SMALL (AML_RESOURCE_IRQ
),
174 ACPI_AML_SIZE_SMALL (AML_RESOURCE_DMA
),
175 ACPI_AML_SIZE_SMALL (AML_RESOURCE_START_DEPENDENT
),
176 ACPI_AML_SIZE_SMALL (AML_RESOURCE_END_DEPENDENT
),
177 ACPI_AML_SIZE_SMALL (AML_RESOURCE_IO
),
178 ACPI_AML_SIZE_SMALL (AML_RESOURCE_FIXED_IO
),
179 ACPI_AML_SIZE_SMALL (AML_RESOURCE_FIXED_DMA
),
183 ACPI_AML_SIZE_SMALL (AML_RESOURCE_VENDOR_SMALL
),
184 ACPI_AML_SIZE_SMALL (AML_RESOURCE_END_TAG
),
186 /* Large descriptors */
189 ACPI_AML_SIZE_LARGE (AML_RESOURCE_MEMORY24
),
190 ACPI_AML_SIZE_LARGE (AML_RESOURCE_GENERIC_REGISTER
),
192 ACPI_AML_SIZE_LARGE (AML_RESOURCE_VENDOR_LARGE
),
193 ACPI_AML_SIZE_LARGE (AML_RESOURCE_MEMORY32
),
194 ACPI_AML_SIZE_LARGE (AML_RESOURCE_FIXED_MEMORY32
),
195 ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS32
),
196 ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS16
),
197 ACPI_AML_SIZE_LARGE (AML_RESOURCE_EXTENDED_IRQ
),
198 ACPI_AML_SIZE_LARGE (AML_RESOURCE_ADDRESS64
),
199 ACPI_AML_SIZE_LARGE (AML_RESOURCE_EXTENDED_ADDRESS64
),
200 ACPI_AML_SIZE_LARGE (AML_RESOURCE_GPIO
),
201 ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_FUNCTION
),
202 ACPI_AML_SIZE_LARGE (AML_RESOURCE_COMMON_SERIALBUS
),
203 ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_CONFIG
),
204 ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_GROUP
),
205 ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_GROUP_FUNCTION
),
206 ACPI_AML_SIZE_LARGE (AML_RESOURCE_PIN_GROUP_CONFIG
),
209 const UINT8 AcpiGbl_ResourceAmlSerialBusSizes
[] =
212 ACPI_AML_SIZE_LARGE (AML_RESOURCE_I2C_SERIALBUS
),
213 ACPI_AML_SIZE_LARGE (AML_RESOURCE_SPI_SERIALBUS
),
214 ACPI_AML_SIZE_LARGE (AML_RESOURCE_UART_SERIALBUS
),
219 * Resource types, used to validate the resource length field.
220 * The length of fixed-length types must match exactly, variable
221 * lengths must meet the minimum required length, etc.
222 * Zero indicates a reserved (and therefore invalid) resource type.
224 static const UINT8 AcpiGbl_ResourceTypes
[] =
226 /* Small descriptors */
232 ACPI_SMALL_VARIABLE_LENGTH
, /* 04 IRQ */
233 ACPI_FIXED_LENGTH
, /* 05 DMA */
234 ACPI_SMALL_VARIABLE_LENGTH
, /* 06 StartDependentFunctions */
235 ACPI_FIXED_LENGTH
, /* 07 EndDependentFunctions */
236 ACPI_FIXED_LENGTH
, /* 08 IO */
237 ACPI_FIXED_LENGTH
, /* 09 FixedIO */
238 ACPI_FIXED_LENGTH
, /* 0A FixedDMA */
242 ACPI_VARIABLE_LENGTH
, /* 0E VendorShort */
243 ACPI_FIXED_LENGTH
, /* 0F EndTag */
245 /* Large descriptors */
248 ACPI_FIXED_LENGTH
, /* 01 Memory24 */
249 ACPI_FIXED_LENGTH
, /* 02 GenericRegister */
251 ACPI_VARIABLE_LENGTH
, /* 04 VendorLong */
252 ACPI_FIXED_LENGTH
, /* 05 Memory32 */
253 ACPI_FIXED_LENGTH
, /* 06 Memory32Fixed */
254 ACPI_VARIABLE_LENGTH
, /* 07 Dword* address */
255 ACPI_VARIABLE_LENGTH
, /* 08 Word* address */
256 ACPI_VARIABLE_LENGTH
, /* 09 ExtendedIRQ */
257 ACPI_VARIABLE_LENGTH
, /* 0A Qword* address */
258 ACPI_FIXED_LENGTH
, /* 0B Extended* address */
259 ACPI_VARIABLE_LENGTH
, /* 0C Gpio* */
260 ACPI_VARIABLE_LENGTH
, /* 0D PinFunction */
261 ACPI_VARIABLE_LENGTH
, /* 0E *SerialBus */
262 ACPI_VARIABLE_LENGTH
, /* 0F PinConfig */
263 ACPI_VARIABLE_LENGTH
, /* 10 PinGroup */
264 ACPI_VARIABLE_LENGTH
, /* 11 PinGroupFunction */
265 ACPI_VARIABLE_LENGTH
, /* 12 PinGroupConfig */
269 /*******************************************************************************
271 * FUNCTION: AcpiUtWalkAmlResources
273 * PARAMETERS: WalkState - Current walk info
274 * PARAMETERS: Aml - Pointer to the raw AML resource template
275 * AmlLength - Length of the entire template
276 * UserFunction - Called once for each descriptor found. If
277 * NULL, a pointer to the EndTag is returned
278 * Context - Passed to UserFunction
282 * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
283 * once for each resource found.
285 ******************************************************************************/
288 AcpiUtWalkAmlResources (
289 ACPI_WALK_STATE
*WalkState
,
292 ACPI_WALK_AML_CALLBACK UserFunction
,
300 UINT8 EndTag
[2] = {0x79, 0x00};
303 ACPI_FUNCTION_TRACE (UtWalkAmlResources
);
306 /* The absolute minimum resource template is one EndTag descriptor */
308 if (AmlLength
< sizeof (AML_RESOURCE_END_TAG
))
310 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG
);
313 /* Point to the end of the resource template buffer */
315 EndAml
= Aml
+ AmlLength
;
317 /* Walk the byte list, abort on any invalid descriptor type or length */
321 /* Validate the Resource Type and Resource Length */
323 Status
= AcpiUtValidateResource (WalkState
, Aml
, &ResourceIndex
);
324 if (ACPI_FAILURE (Status
))
327 * Exit on failure. Cannot continue because the descriptor
328 * length may be bogus also.
330 return_ACPI_STATUS (Status
);
333 /* Get the length of this descriptor */
335 Length
= AcpiUtGetDescriptorLength (Aml
);
337 /* Invoke the user function */
341 Status
= UserFunction (
342 Aml
, Length
, Offset
, ResourceIndex
, Context
);
343 if (ACPI_FAILURE (Status
))
345 return_ACPI_STATUS (Status
);
349 /* An EndTag descriptor terminates this resource template */
351 if (AcpiUtGetResourceType (Aml
) == ACPI_RESOURCE_NAME_END_TAG
)
354 * There must be at least one more byte in the buffer for
355 * the 2nd byte of the EndTag
357 if ((Aml
+ 1) >= EndAml
)
359 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG
);
363 * Don't attempt to perform any validation on the 2nd byte.
364 * Although all known ASL compilers insert a zero for the 2nd
365 * byte, it can also be a checksum (as per the ACPI spec),
366 * and this is occasionally seen in the field. July 2017.
369 /* Return the pointer to the EndTag if requested */
378 return_ACPI_STATUS (AE_OK
);
385 /* Did not find an EndTag descriptor */
389 /* Insert an EndTag anyway. AcpiRsGetListLength always leaves room */
391 (void) AcpiUtValidateResource (WalkState
, EndTag
, &ResourceIndex
);
392 Status
= UserFunction (EndTag
, 2, Offset
, ResourceIndex
, Context
);
393 if (ACPI_FAILURE (Status
))
395 return_ACPI_STATUS (Status
);
399 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG
);
403 /*******************************************************************************
405 * FUNCTION: AcpiUtValidateResource
407 * PARAMETERS: WalkState - Current walk info
408 * Aml - Pointer to the raw AML resource descriptor
409 * ReturnIndex - Where the resource index is returned. NULL
410 * if the index is not required.
412 * RETURN: Status, and optionally the Index into the global resource tables
414 * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
415 * Type and Resource Length. Returns an index into the global
416 * resource information/dispatch tables for later use.
418 ******************************************************************************/
421 AcpiUtValidateResource (
422 ACPI_WALK_STATE
*WalkState
,
426 AML_RESOURCE
*AmlResource
;
429 ACPI_RS_LENGTH ResourceLength
;
430 ACPI_RS_LENGTH MinimumResourceLength
;
433 ACPI_FUNCTION_ENTRY ();
437 * 1) Validate the ResourceType field (Byte 0)
439 ResourceType
= ACPI_GET8 (Aml
);
442 *ReturnIndex
= 0; /* silence bogus gcc warning */
446 * Byte 0 contains the descriptor name (Resource Type)
447 * Examine the large/small bit in the resource header
449 if (ResourceType
& ACPI_RESOURCE_NAME_LARGE
)
451 /* Verify the large resource type (name) against the max */
453 if (ResourceType
> ACPI_RESOURCE_NAME_LARGE_MAX
)
455 goto InvalidResource
;
459 * Large Resource Type -- bits 6:0 contain the name
460 * Translate range 0x80-0x8B to index range 0x10-0x1B
462 ResourceIndex
= (UINT8
) (ResourceType
- 0x70);
467 * Small Resource Type -- bits 6:3 contain the name
468 * Shift range to index range 0x00-0x0F
470 ResourceIndex
= (UINT8
)
471 ((ResourceType
& ACPI_RESOURCE_NAME_SMALL_MASK
) >> 3);
475 * Check validity of the resource type, via AcpiGbl_ResourceTypes.
476 * Zero indicates an invalid resource.
478 if (!AcpiGbl_ResourceTypes
[ResourceIndex
])
480 goto InvalidResource
;
484 * Validate the ResourceLength field. This ensures that the length
485 * is at least reasonable, and guarantees that it is non-zero.
487 ResourceLength
= AcpiUtGetResourceLength (Aml
);
488 MinimumResourceLength
= AcpiGbl_ResourceAmlSizes
[ResourceIndex
];
490 /* Validate based upon the type of resource - fixed length or variable */
492 switch (AcpiGbl_ResourceTypes
[ResourceIndex
])
494 case ACPI_FIXED_LENGTH
:
496 /* Fixed length resource, length must match exactly */
498 if (ResourceLength
!= MinimumResourceLength
)
500 goto BadResourceLength
;
504 case ACPI_VARIABLE_LENGTH
:
506 /* Variable length resource, length must be at least the minimum */
508 if (ResourceLength
< MinimumResourceLength
)
510 goto BadResourceLength
;
514 case ACPI_SMALL_VARIABLE_LENGTH
:
516 /* Small variable length resource, length can be (Min) or (Min-1) */
518 if ((ResourceLength
> MinimumResourceLength
) ||
519 (ResourceLength
< (MinimumResourceLength
- 1)))
521 goto BadResourceLength
;
527 /* Shouldn't happen (because of validation earlier), but be sure */
529 goto InvalidResource
;
532 AmlResource
= ACPI_CAST_PTR (AML_RESOURCE
, Aml
);
533 if (ResourceType
== ACPI_RESOURCE_NAME_SERIAL_BUS
)
535 /* Validate the BusType field */
537 if ((AmlResource
->CommonSerialBus
.Type
== 0) ||
538 (AmlResource
->CommonSerialBus
.Type
> AML_RESOURCE_MAX_SERIALBUSTYPE
))
542 ACPI_ERROR ((AE_INFO
,
543 "Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X",
544 AmlResource
->CommonSerialBus
.Type
));
546 return (AE_AML_INVALID_RESOURCE_TYPE
);
550 /* Optionally return the resource table index */
554 *ReturnIndex
= ResourceIndex
;
564 ACPI_ERROR ((AE_INFO
,
565 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
568 return (AE_AML_INVALID_RESOURCE_TYPE
);
574 ACPI_ERROR ((AE_INFO
,
575 "Invalid resource descriptor length: Type "
576 "0x%2.2X, Length 0x%4.4X, MinLength 0x%4.4X",
577 ResourceType
, ResourceLength
, MinimumResourceLength
));
579 return (AE_AML_BAD_RESOURCE_LENGTH
);
583 /*******************************************************************************
585 * FUNCTION: AcpiUtGetResourceType
587 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
589 * RETURN: The Resource Type with no extraneous bits (except the
590 * Large/Small descriptor bit -- this is left alone)
592 * DESCRIPTION: Extract the Resource Type/Name from the first byte of
593 * a resource descriptor.
595 ******************************************************************************/
598 AcpiUtGetResourceType (
601 ACPI_FUNCTION_ENTRY ();
605 * Byte 0 contains the descriptor name (Resource Type)
606 * Examine the large/small bit in the resource header
608 if (ACPI_GET8 (Aml
) & ACPI_RESOURCE_NAME_LARGE
)
610 /* Large Resource Type -- bits 6:0 contain the name */
612 return (ACPI_GET8 (Aml
));
616 /* Small Resource Type -- bits 6:3 contain the name */
618 return ((UINT8
) (ACPI_GET8 (Aml
) & ACPI_RESOURCE_NAME_SMALL_MASK
));
623 /*******************************************************************************
625 * FUNCTION: AcpiUtGetResourceLength
627 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
629 * RETURN: Byte Length
631 * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
632 * definition, this does not include the size of the descriptor
633 * header or the length field itself.
635 ******************************************************************************/
638 AcpiUtGetResourceLength (
641 ACPI_RS_LENGTH ResourceLength
;
644 ACPI_FUNCTION_ENTRY ();
648 * Byte 0 contains the descriptor name (Resource Type)
649 * Examine the large/small bit in the resource header
651 if (ACPI_GET8 (Aml
) & ACPI_RESOURCE_NAME_LARGE
)
653 /* Large Resource type -- bytes 1-2 contain the 16-bit length */
655 ACPI_MOVE_16_TO_16 (&ResourceLength
, ACPI_ADD_PTR (UINT8
, Aml
, 1));
660 /* Small Resource type -- bits 2:0 of byte 0 contain the length */
662 ResourceLength
= (UINT16
) (ACPI_GET8 (Aml
) &
663 ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK
);
666 return (ResourceLength
);
670 /*******************************************************************************
672 * FUNCTION: AcpiUtGetResourceHeaderLength
674 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
676 * RETURN: Length of the AML header (depends on large/small descriptor)
678 * DESCRIPTION: Get the length of the header for this resource.
680 ******************************************************************************/
683 AcpiUtGetResourceHeaderLength (
686 ACPI_FUNCTION_ENTRY ();
689 /* Examine the large/small bit in the resource header */
691 if (ACPI_GET8 (Aml
) & ACPI_RESOURCE_NAME_LARGE
)
693 return (sizeof (AML_RESOURCE_LARGE_HEADER
));
697 return (sizeof (AML_RESOURCE_SMALL_HEADER
));
702 /*******************************************************************************
704 * FUNCTION: AcpiUtGetDescriptorLength
706 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
708 * RETURN: Byte length
710 * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
711 * length of the descriptor header and the length field itself.
712 * Used to walk descriptor lists.
714 ******************************************************************************/
717 AcpiUtGetDescriptorLength (
720 ACPI_FUNCTION_ENTRY ();
724 * Get the Resource Length (does not include header length) and add
725 * the header length (depends on if this is a small or large resource)
727 return (AcpiUtGetResourceLength (Aml
) +
728 AcpiUtGetResourceHeaderLength (Aml
));
732 /*******************************************************************************
734 * FUNCTION: AcpiUtGetResourceEndTag
736 * PARAMETERS: ObjDesc - The resource template buffer object
737 * EndTag - Where the pointer to the EndTag is returned
739 * RETURN: Status, pointer to the end tag
741 * DESCRIPTION: Find the EndTag resource descriptor in an AML resource template
742 * Note: allows a buffer length of zero.
744 ******************************************************************************/
747 AcpiUtGetResourceEndTag (
748 ACPI_OPERAND_OBJECT
*ObjDesc
,
754 ACPI_FUNCTION_TRACE (UtGetResourceEndTag
);
757 /* Allow a buffer length of zero */
759 if (!ObjDesc
->Buffer
.Length
)
761 *EndTag
= ObjDesc
->Buffer
.Pointer
;
762 return_ACPI_STATUS (AE_OK
);
765 /* Validate the template and get a pointer to the EndTag */
767 Status
= AcpiUtWalkAmlResources (NULL
, ObjDesc
->Buffer
.Pointer
,
768 ObjDesc
->Buffer
.Length
, NULL
, (void **) EndTag
);
770 return_ACPI_STATUS (Status
);