1 /*******************************************************************************
3 * Module Name: utresrc - Resource management utilities
5 ******************************************************************************/
7 /******************************************************************************
11 * Some or all of this work - Copyright (c) 1999 - 2017, 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 *****************************************************************************/
152 #include <contrib/dev/acpica/include/acpi.h>
153 #include <contrib/dev/acpica/include/accommon.h>
154 #include <contrib/dev/acpica/include/acresrc.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);
307 * The absolute minimum resource template is one EndTag descriptor.
308 * However, we will treat a lone EndTag as just a simple buffer.
310 if (AmlLength <= sizeof (AML_RESOURCE_END_TAG))
312 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
315 /* Point to the end of the resource template buffer */
317 EndAml = Aml + AmlLength;
319 /* Walk the byte list, abort on any invalid descriptor type or length */
323 /* Validate the Resource Type and Resource Length */
325 Status = AcpiUtValidateResource (WalkState, Aml, &ResourceIndex);
326 if (ACPI_FAILURE (Status))
329 * Exit on failure. Cannot continue because the descriptor
330 * length may be bogus also.
332 return_ACPI_STATUS (Status);
335 /* Get the length of this descriptor */
337 Length = AcpiUtGetDescriptorLength (Aml);
339 /* Invoke the user function */
343 Status = UserFunction (
344 Aml, Length, Offset, ResourceIndex, Context);
345 if (ACPI_FAILURE (Status))
347 return_ACPI_STATUS (Status);
351 /* An EndTag descriptor terminates this resource template */
353 if (AcpiUtGetResourceType (Aml) == ACPI_RESOURCE_NAME_END_TAG)
356 * There must be at least one more byte in the buffer for
357 * the 2nd byte of the EndTag
359 if ((Aml + 1) >= EndAml)
361 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
365 * The EndTag opcode must be followed by a zero byte.
366 * Although this byte is technically defined to be a checksum,
367 * in practice, all ASL compilers set this byte to zero.
371 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
374 /* Return the pointer to the EndTag if requested */
382 * Normal exit. Note: We allow the buffer to be larger than
383 * the resource template, as long as the END_TAG exists.
385 return_ACPI_STATUS (AE_OK);
392 /* Did not find an EndTag descriptor */
396 /* Insert an EndTag anyway. AcpiRsGetListLength always leaves room */
398 (void) AcpiUtValidateResource (WalkState, EndTag, &ResourceIndex);
399 Status = UserFunction (EndTag, 2, Offset, ResourceIndex, Context);
400 if (ACPI_FAILURE (Status))
402 return_ACPI_STATUS (Status);
406 return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
410 /*******************************************************************************
412 * FUNCTION: AcpiUtValidateResource
414 * PARAMETERS: WalkState - Current walk info
415 * Aml - Pointer to the raw AML resource descriptor
416 * ReturnIndex - Where the resource index is returned. NULL
417 * if the index is not required.
419 * RETURN: Status, and optionally the Index into the global resource tables
421 * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
422 * Type and Resource Length. Returns an index into the global
423 * resource information/dispatch tables for later use.
425 ******************************************************************************/
428 AcpiUtValidateResource (
429 ACPI_WALK_STATE *WalkState,
433 AML_RESOURCE *AmlResource;
436 ACPI_RS_LENGTH ResourceLength;
437 ACPI_RS_LENGTH MinimumResourceLength;
440 ACPI_FUNCTION_ENTRY ();
444 * 1) Validate the ResourceType field (Byte 0)
446 ResourceType = ACPI_GET8 (Aml);
449 * Byte 0 contains the descriptor name (Resource Type)
450 * Examine the large/small bit in the resource header
452 if (ResourceType & ACPI_RESOURCE_NAME_LARGE)
454 /* Verify the large resource type (name) against the max */
456 if (ResourceType > ACPI_RESOURCE_NAME_LARGE_MAX)
458 goto InvalidResource;
462 * Large Resource Type -- bits 6:0 contain the name
463 * Translate range 0x80-0x8B to index range 0x10-0x1B
465 ResourceIndex = (UINT8) (ResourceType - 0x70);
470 * Small Resource Type -- bits 6:3 contain the name
471 * Shift range to index range 0x00-0x0F
473 ResourceIndex = (UINT8)
474 ((ResourceType & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
478 * Check validity of the resource type, via AcpiGbl_ResourceTypes.
479 * Zero indicates an invalid resource.
481 if (!AcpiGbl_ResourceTypes[ResourceIndex])
483 goto InvalidResource;
487 * Validate the ResourceLength field. This ensures that the length
488 * is at least reasonable, and guarantees that it is non-zero.
490 ResourceLength = AcpiUtGetResourceLength (Aml);
491 MinimumResourceLength = AcpiGbl_ResourceAmlSizes[ResourceIndex];
493 /* Validate based upon the type of resource - fixed length or variable */
495 switch (AcpiGbl_ResourceTypes[ResourceIndex])
497 case ACPI_FIXED_LENGTH:
499 /* Fixed length resource, length must match exactly */
501 if (ResourceLength != MinimumResourceLength)
503 goto BadResourceLength;
507 case ACPI_VARIABLE_LENGTH:
509 /* Variable length resource, length must be at least the minimum */
511 if (ResourceLength < MinimumResourceLength)
513 goto BadResourceLength;
517 case ACPI_SMALL_VARIABLE_LENGTH:
519 /* Small variable length resource, length can be (Min) or (Min-1) */
521 if ((ResourceLength > MinimumResourceLength) ||
522 (ResourceLength < (MinimumResourceLength - 1)))
524 goto BadResourceLength;
530 /* Shouldn't happen (because of validation earlier), but be sure */
532 goto InvalidResource;
535 AmlResource = ACPI_CAST_PTR (AML_RESOURCE, Aml);
536 if (ResourceType == ACPI_RESOURCE_NAME_SERIAL_BUS)
538 /* Validate the BusType field */
540 if ((AmlResource->CommonSerialBus.Type == 0) ||
541 (AmlResource->CommonSerialBus.Type > AML_RESOURCE_MAX_SERIALBUSTYPE))
545 ACPI_ERROR ((AE_INFO,
546 "Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X",
547 AmlResource->CommonSerialBus.Type));
549 return (AE_AML_INVALID_RESOURCE_TYPE);
553 /* Optionally return the resource table index */
557 *ReturnIndex = ResourceIndex;
567 ACPI_ERROR ((AE_INFO,
568 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
571 return (AE_AML_INVALID_RESOURCE_TYPE);
577 ACPI_ERROR ((AE_INFO,
578 "Invalid resource descriptor length: Type "
579 "0x%2.2X, Length 0x%4.4X, MinLength 0x%4.4X",
580 ResourceType, ResourceLength, MinimumResourceLength));
582 return (AE_AML_BAD_RESOURCE_LENGTH);
586 /*******************************************************************************
588 * FUNCTION: AcpiUtGetResourceType
590 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
592 * RETURN: The Resource Type with no extraneous bits (except the
593 * Large/Small descriptor bit -- this is left alone)
595 * DESCRIPTION: Extract the Resource Type/Name from the first byte of
596 * a resource descriptor.
598 ******************************************************************************/
601 AcpiUtGetResourceType (
604 ACPI_FUNCTION_ENTRY ();
608 * Byte 0 contains the descriptor name (Resource Type)
609 * Examine the large/small bit in the resource header
611 if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
613 /* Large Resource Type -- bits 6:0 contain the name */
615 return (ACPI_GET8 (Aml));
619 /* Small Resource Type -- bits 6:3 contain the name */
621 return ((UINT8) (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
626 /*******************************************************************************
628 * FUNCTION: AcpiUtGetResourceLength
630 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
632 * RETURN: Byte Length
634 * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
635 * definition, this does not include the size of the descriptor
636 * header or the length field itself.
638 ******************************************************************************/
641 AcpiUtGetResourceLength (
644 ACPI_RS_LENGTH ResourceLength;
647 ACPI_FUNCTION_ENTRY ();
651 * Byte 0 contains the descriptor name (Resource Type)
652 * Examine the large/small bit in the resource header
654 if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
656 /* Large Resource type -- bytes 1-2 contain the 16-bit length */
658 ACPI_MOVE_16_TO_16 (&ResourceLength, ACPI_ADD_PTR (UINT8, Aml, 1));
663 /* Small Resource type -- bits 2:0 of byte 0 contain the length */
665 ResourceLength = (UINT16) (ACPI_GET8 (Aml) &
666 ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
669 return (ResourceLength);
673 /*******************************************************************************
675 * FUNCTION: AcpiUtGetResourceHeaderLength
677 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
679 * RETURN: Length of the AML header (depends on large/small descriptor)
681 * DESCRIPTION: Get the length of the header for this resource.
683 ******************************************************************************/
686 AcpiUtGetResourceHeaderLength (
689 ACPI_FUNCTION_ENTRY ();
692 /* Examine the large/small bit in the resource header */
694 if (ACPI_GET8 (Aml) & ACPI_RESOURCE_NAME_LARGE)
696 return (sizeof (AML_RESOURCE_LARGE_HEADER));
700 return (sizeof (AML_RESOURCE_SMALL_HEADER));
705 /*******************************************************************************
707 * FUNCTION: AcpiUtGetDescriptorLength
709 * PARAMETERS: Aml - Pointer to the raw AML resource descriptor
711 * RETURN: Byte length
713 * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
714 * length of the descriptor header and the length field itself.
715 * Used to walk descriptor lists.
717 ******************************************************************************/
720 AcpiUtGetDescriptorLength (
723 ACPI_FUNCTION_ENTRY ();
727 * Get the Resource Length (does not include header length) and add
728 * the header length (depends on if this is a small or large resource)
730 return (AcpiUtGetResourceLength (Aml) +
731 AcpiUtGetResourceHeaderLength (Aml));
735 /*******************************************************************************
737 * FUNCTION: AcpiUtGetResourceEndTag
739 * PARAMETERS: ObjDesc - The resource template buffer object
740 * EndTag - Where the pointer to the EndTag is returned
742 * RETURN: Status, pointer to the end tag
744 * DESCRIPTION: Find the EndTag resource descriptor in an AML resource template
745 * Note: allows a buffer length of zero.
747 ******************************************************************************/
750 AcpiUtGetResourceEndTag (
751 ACPI_OPERAND_OBJECT *ObjDesc,
757 ACPI_FUNCTION_TRACE (UtGetResourceEndTag);
760 /* Allow a buffer length of zero */
762 if (!ObjDesc->Buffer.Length)
764 *EndTag = ObjDesc->Buffer.Pointer;
765 return_ACPI_STATUS (AE_OK);
768 /* Validate the template and get a pointer to the EndTag */
770 Status = AcpiUtWalkAmlResources (NULL, ObjDesc->Buffer.Pointer,
771 ObjDesc->Buffer.Length, NULL, (void **) EndTag);
773 return_ACPI_STATUS (Status);