aboutsummaryrefslogtreecommitdiff
path: root/drivers/acpi/utilities/utresrc.c
blob: 07a314c710d8f7f8978b246d8ee3c33770cc30f0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
/*******************************************************************************
 *
 * Module Name: utresrc - Resource managment utilities
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * 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 <acpi/amlresrc.h>

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utmisc")

/*
 * Base sizes of the raw AML resource descriptors, indexed by resource type.
 * Zero indicates a reserved (and therefore invalid) resource type.
 */
const u8 acpi_gbl_resource_aml_sizes[] = {
	/* Small descriptors */

	0,
	0,
	0,
	0,
	ACPI_AML_SIZE_SMALL(struct aml_resource_irq),
	ACPI_AML_SIZE_SMALL(struct aml_resource_dma),
	ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent),
	ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent),
	ACPI_AML_SIZE_SMALL(struct aml_resource_io),
	ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io),
	0,
	0,
	0,
	0,
	ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small),
	ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag),

	/* Large descriptors */

	0,
	ACPI_AML_SIZE_LARGE(struct aml_resource_memory24),
	ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register),
	0,
	ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large),
	ACPI_AML_SIZE_LARGE(struct aml_resource_memory32),
	ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32),
	ACPI_AML_SIZE_LARGE(struct aml_resource_address32),
	ACPI_AML_SIZE_LARGE(struct aml_resource_address16),
	ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq),
	ACPI_AML_SIZE_LARGE(struct aml_resource_address64),
	ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64)
};

/*
 * Resource types, used to validate the resource length field.
 * The length of fixed-length types must match exactly, variable
 * lengths must meet the minimum required length, etc.
 * Zero indicates a reserved (and therefore invalid) resource type.
 */
static const u8 acpi_gbl_resource_types[] = {
	/* Small descriptors */

	0,
	0,
	0,
	0,
	ACPI_SMALL_VARIABLE_LENGTH,
	ACPI_FIXED_LENGTH,
	ACPI_SMALL_VARIABLE_LENGTH,
	ACPI_FIXED_LENGTH,
	ACPI_FIXED_LENGTH,
	ACPI_FIXED_LENGTH,
	0,
	0,
	0,
	0,
	ACPI_VARIABLE_LENGTH,
	ACPI_FIXED_LENGTH,

	/* Large descriptors */

	0,
	ACPI_FIXED_LENGTH,
	ACPI_FIXED_LENGTH,
	0,
	ACPI_VARIABLE_LENGTH,
	ACPI_FIXED_LENGTH,
	ACPI_FIXED_LENGTH,
	ACPI_VARIABLE_LENGTH,
	ACPI_VARIABLE_LENGTH,
	ACPI_VARIABLE_LENGTH,
	ACPI_VARIABLE_LENGTH,
	ACPI_FIXED_LENGTH
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_validate_resource
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *              return_index    - Where the resource index is returned. NULL
 *                                if the index is not required.
 *
 * RETURN:      Status, and optionally the Index into the global resource tables
 *
 * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
 *              Type and Resource Length. Returns an index into the global
 *              resource information/dispatch tables for later use.
 *
 ******************************************************************************/

acpi_status acpi_ut_validate_resource(void *aml, u8 * return_index)
{
	u8 resource_type;
	u8 resource_index;
	acpi_rs_length resource_length;
	acpi_rs_length minimum_resource_length;

	ACPI_FUNCTION_ENTRY();

	/*
	 * 1) Validate the resource_type field (Byte 0)
	 */
	resource_type = *((u8 *) aml);

	/*
	 * Byte 0 contains the descriptor name (Resource Type)
	 * Examine the large/small bit in the resource header
	 */
	if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
		/* Verify the large resource type (name) against the max */

		if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
			return (AE_AML_INVALID_RESOURCE_TYPE);
		}

		/*
		 * Large Resource Type -- bits 6:0 contain the name
		 * Translate range 0x80-0x8B to index range 0x10-0x1B
		 */
		resource_index = (u8) (resource_type - 0x70);
	} else {
		/*
		 * Small Resource Type -- bits 6:3 contain the name
		 * Shift range to index range 0x00-0x0F
		 */
		resource_index = (u8)
		    ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
	}

	/* Check validity of the resource type, zero indicates name is invalid */

	if (!acpi_gbl_resource_types[resource_index]) {
		return (AE_AML_INVALID_RESOURCE_TYPE);
	}

	/*
	 * 2) Validate the resource_length field. This ensures that the length
	 *    is at least reasonable, and guarantees that it is non-zero.
	 */
	resource_length = acpi_ut_get_resource_length(aml);
	minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];

	/* Validate based upon the type of resource - fixed length or variable */

	switch (acpi_gbl_resource_types[resource_index]) {
	case ACPI_FIXED_LENGTH:

		/* Fixed length resource, length must match exactly */

		if (resource_length != minimum_resource_length) {
			return (AE_AML_BAD_RESOURCE_LENGTH);
		}
		break;

	case ACPI_VARIABLE_LENGTH:

		/* Variable length resource, length must be at least the minimum */

		if (resource_length < minimum_resource_length) {
			return (AE_AML_BAD_RESOURCE_LENGTH);
		}
		break;

	case ACPI_SMALL_VARIABLE_LENGTH:

		/* Small variable length resource, length can be (Min) or (Min-1) */

		if ((resource_length > minimum_resource_length) ||
		    (resource_length < (minimum_resource_length - 1))) {
			return (AE_AML_BAD_RESOURCE_LENGTH);
		}
		break;

	default:

		/* Shouldn't happen (because of validation earlier), but be sure */

		return (AE_AML_INVALID_RESOURCE_TYPE);
	}

	/* Optionally return the resource table index */

	if (return_index) {
		*return_index = resource_index;
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_type
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      The Resource Type with no extraneous bits (except the
 *              Large/Small descriptor bit -- this is left alone)
 *
 * DESCRIPTION: Extract the Resource Type/Name from the first byte of
 *              a resource descriptor.
 *
 ******************************************************************************/

u8 acpi_ut_get_resource_type(void *aml)
{
	ACPI_FUNCTION_ENTRY();

	/*
	 * Byte 0 contains the descriptor name (Resource Type)
	 * Examine the large/small bit in the resource header
	 */
	if (*((u8 *) aml) & ACPI_RESOURCE_NAME_LARGE) {
		/* Large Resource Type -- bits 6:0 contain the name */

		return (*((u8 *) aml));
	} else {
		/* Small Resource Type -- bits 6:3 contain the name */

		return ((u8) (*((u8 *) aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_length
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      Byte Length
 *
 * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
 *              definition, this does not include the size of the descriptor
 *              header or the length field itself.
 *
 ******************************************************************************/

u16 acpi_ut_get_resource_length(void *aml)
{
	acpi_rs_length resource_length;

	ACPI_FUNCTION_ENTRY();

	/*
	 * Byte 0 contains the descriptor name (Resource Type)
	 * Examine the large/small bit in the resource header
	 */
	if (*((u8 *) aml) & ACPI_RESOURCE_NAME_LARGE) {
		/* Large Resource type -- bytes 1-2 contain the 16-bit length */

		ACPI_MOVE_16_TO_16(&resource_length, &((u8 *) aml)[1]);

	} else {
		/* Small Resource type -- bits 2:0 of byte 0 contain the length */

		resource_length = (u16) (*((u8 *) aml) &
					 ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
	}

	return (resource_length);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_header_length
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      Length of the AML header (depends on large/small descriptor)
 *
 * DESCRIPTION: Get the length of the header for this resource.
 *
 ******************************************************************************/

u8 acpi_ut_get_resource_header_length(void *aml)
{
	ACPI_FUNCTION_ENTRY();

	/* Examine the large/small bit in the resource header */

	if (*((u8 *) aml) & ACPI_RESOURCE_NAME_LARGE) {
		return (sizeof(struct aml_resource_large_header));
	} else {
		return (sizeof(struct aml_resource_small_header));
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_descriptor_length
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      Byte length
 *
 * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
 *              length of the descriptor header and the length field itself.
 *              Used to walk descriptor lists.
 *
 ******************************************************************************/

u32 acpi_ut_get_descriptor_length(void *aml)
{
	ACPI_FUNCTION_ENTRY();

	/*
	 * Get the Resource Length (does not include header length) and add
	 * the header length (depends on if this is a small or large resource)
	 */
	return (acpi_ut_get_resource_length(aml) +
		acpi_ut_get_resource_header_length(aml));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_end_tag
 *
 * PARAMETERS:  obj_desc        - The resource template buffer object
 *
 * RETURN:      Pointer to the end tag
 *
 * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
 *
 ******************************************************************************/

acpi_status
acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc,
			     u8 ** end_tag)
{
	acpi_status status;
	u8 *aml;
	u8 *end_aml;

	ACPI_FUNCTION_TRACE("ut_get_resource_end_tag");

	/* Get start and end pointers */

	aml = obj_desc->buffer.pointer;
	end_aml = aml + obj_desc->buffer.length;

	/* Walk the resource template, one descriptor per iteration */

	while (aml < end_aml) {
		/* Validate the Resource Type and Resource Length */

		status = acpi_ut_validate_resource(aml, NULL);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		/* end_tag resource indicates the end of the resource template */

		if (acpi_ut_get_resource_type(aml) ==
		    ACPI_RESOURCE_NAME_END_TAG) {
			/* Return the pointer to the end_tag */

			*end_tag = aml;
			return_ACPI_STATUS(AE_OK);
		}

		/*
		 * Point to the next resource descriptor in the AML buffer. The
		 * descriptor length is guaranteed to be non-zero by resource
		 * validation above.
		 */
		aml += acpi_ut_get_descriptor_length(aml);
	}

	/* Did not find an end_tag resource descriptor */

	return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
}