summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/exmisc.c
blob: 60e854965af9862775a5dcbfd57b3839b16b15ab (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
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
 *
 * Copyright (C) 2000 - 2019, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "amlcode.h"

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exmisc")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_get_object_reference
 *
 * PARAMETERS:  obj_desc            - Create a reference to this object
 *              return_desc         - Where to store the reference
 *              walk_state          - Current state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Obtain and return a "reference" to the target object
 *              Common code for the ref_of_op and the cond_ref_of_op.
 *
 ******************************************************************************/
acpi_status
acpi_ex_get_object_reference(union acpi_operand_object *obj_desc,
			     union acpi_operand_object **return_desc,
			     struct acpi_walk_state *walk_state)
{
	union acpi_operand_object *reference_obj;
	union acpi_operand_object *referenced_obj;

	ACPI_FUNCTION_TRACE_PTR(ex_get_object_reference, obj_desc);

	*return_desc = NULL;

	switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
	case ACPI_DESC_TYPE_OPERAND:

		if (obj_desc->common.type != ACPI_TYPE_LOCAL_REFERENCE) {
			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}

		/*
		 * Must be a reference to a Local or Arg
		 */
		switch (obj_desc->reference.class) {
		case ACPI_REFCLASS_LOCAL:
		case ACPI_REFCLASS_ARG:
		case ACPI_REFCLASS_DEBUG:

			/* The referenced object is the pseudo-node for the local/arg */

			referenced_obj = obj_desc->reference.object;
			break;

		default:

			ACPI_ERROR((AE_INFO, "Invalid Reference Class 0x%2.2X",
				    obj_desc->reference.class));
			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}
		break;

	case ACPI_DESC_TYPE_NAMED:
		/*
		 * A named reference that has already been resolved to a Node
		 */
		referenced_obj = obj_desc;
		break;

	default:

		ACPI_ERROR((AE_INFO, "Invalid descriptor type 0x%X",
			    ACPI_GET_DESCRIPTOR_TYPE(obj_desc)));
		return_ACPI_STATUS(AE_TYPE);
	}

	/* Create a new reference object */

	reference_obj =
	    acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
	if (!reference_obj) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	reference_obj->reference.class = ACPI_REFCLASS_REFOF;
	reference_obj->reference.object = referenced_obj;
	*return_desc = reference_obj;

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
			  "Object %p Type [%s], returning Reference %p\n",
			  obj_desc, acpi_ut_get_object_type_name(obj_desc),
			  *return_desc));

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_do_math_op
 *
 * PARAMETERS:  opcode              - AML opcode
 *              integer0            - Integer operand #0
 *              integer1            - Integer operand #1
 *
 * RETURN:      Integer result of the operation
 *
 * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
 *              math functions here is to prevent a lot of pointer dereferencing
 *              to obtain the operands.
 *
 ******************************************************************************/

u64 acpi_ex_do_math_op(u16 opcode, u64 integer0, u64 integer1)
{

	ACPI_FUNCTION_ENTRY();

	switch (opcode) {
	case AML_ADD_OP:	/* Add (Integer0, Integer1, Result) */

		return (integer0 + integer1);

	case AML_BIT_AND_OP:	/* And (Integer0, Integer1, Result) */

		return (integer0 & integer1);

	case AML_BIT_NAND_OP:	/* NAnd (Integer0, Integer1, Result) */

		return (~(integer0 & integer1));

	case AML_BIT_OR_OP:	/* Or (Integer0, Integer1, Result) */

		return (integer0 | integer1);

	case AML_BIT_NOR_OP:	/* NOr (Integer0, Integer1, Result) */

		return (~(integer0 | integer1));

	case AML_BIT_XOR_OP:	/* XOr (Integer0, Integer1, Result) */

		return (integer0 ^ integer1);

	case AML_MULTIPLY_OP:	/* Multiply (Integer0, Integer1, Result) */

		return (integer0 * integer1);

	case AML_SHIFT_LEFT_OP:	/* shift_left (Operand, shift_count, Result) */

		/*
		 * We need to check if the shiftcount is larger than the integer bit
		 * width since the behavior of this is not well-defined in the C language.
		 */
		if (integer1 >= acpi_gbl_integer_bit_width) {
			return (0);
		}
		return (integer0 << integer1);

	case AML_SHIFT_RIGHT_OP:	/* shift_right (Operand, shift_count, Result) */

		/*
		 * We need to check if the shiftcount is larger than the integer bit
		 * width since the behavior of this is not well-defined in the C language.
		 */
		if (integer1 >= acpi_gbl_integer_bit_width) {
			return (0);
		}
		return (integer0 >> integer1);

	case AML_SUBTRACT_OP:	/* Subtract (Integer0, Integer1, Result) */

		return (integer0 - integer1);

	default:

		return (0);
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_do_logical_numeric_op
 *
 * PARAMETERS:  opcode              - AML opcode
 *              integer0            - Integer operand #0
 *              integer1            - Integer operand #1
 *              logical_result      - TRUE/FALSE result of the operation
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
 *              operators (LAnd and LOr), both operands must be integers.
 *
 *              Note: cleanest machine code seems to be produced by the code
 *              below, rather than using statements of the form:
 *                  Result = (Integer0 && Integer1);
 *
 ******************************************************************************/

acpi_status
acpi_ex_do_logical_numeric_op(u16 opcode,
			      u64 integer0, u64 integer1, u8 *logical_result)
{
	acpi_status status = AE_OK;
	u8 local_result = FALSE;

	ACPI_FUNCTION_TRACE(ex_do_logical_numeric_op);

	switch (opcode) {
	case AML_LOGICAL_AND_OP:	/* LAnd (Integer0, Integer1) */

		if (integer0 && integer1) {
			local_result = TRUE;
		}
		break;

	case AML_LOGICAL_OR_OP:	/* LOr (Integer0, Integer1) */

		if (integer0 || integer1) {
			local_result = TRUE;
		}
		break;

	default:

		ACPI_ERROR((AE_INFO,
			    "Invalid numeric logical opcode: %X", opcode));
		status = AE_AML_INTERNAL;
		break;
	}

	/* Return the logical result and status */

	*logical_result = local_result;
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_do_logical_op
 *
 * PARAMETERS:  opcode              - AML opcode
 *              operand0            - operand #0
 *              operand1            - operand #1
 *              logical_result      - TRUE/FALSE result of the operation
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
 *              functions here is to prevent a lot of pointer dereferencing
 *              to obtain the operands and to simplify the generation of the
 *              logical value. For the Numeric operators (LAnd and LOr), both
 *              operands must be integers. For the other logical operators,
 *              operands can be any combination of Integer/String/Buffer. The
 *              first operand determines the type to which the second operand
 *              will be converted.
 *
 *              Note: cleanest machine code seems to be produced by the code
 *              below, rather than using statements of the form:
 *                  Result = (Operand0 == Operand1);
 *
 ******************************************************************************/

acpi_status
acpi_ex_do_logical_op(u16 opcode,
		      union acpi_operand_object *operand0,
		      union acpi_operand_object *operand1, u8 * logical_result)
{
	union acpi_operand_object *local_operand1 = operand1;
	u64 integer0;
	u64 integer1;
	u32 length0;
	u32 length1;
	acpi_status status = AE_OK;
	u8 local_result = FALSE;
	int compare;

	ACPI_FUNCTION_TRACE(ex_do_logical_op);

	/*
	 * Convert the second operand if necessary. The first operand
	 * determines the type of the second operand, (See the Data Types
	 * section of the ACPI 3.0+ specification.)  Both object types are
	 * guaranteed to be either Integer/String/Buffer by the operand
	 * resolution mechanism.
	 */
	switch (operand0->common.type) {
	case ACPI_TYPE_INTEGER:

		status = acpi_ex_convert_to_integer(operand1, &local_operand1,
						    ACPI_IMPLICIT_CONVERSION);
		break;

	case ACPI_TYPE_STRING:

		status =
		    acpi_ex_convert_to_string(operand1, &local_operand1,
					      ACPI_IMPLICIT_CONVERT_HEX);
		break;

	case ACPI_TYPE_BUFFER:

		status = acpi_ex_convert_to_buffer(operand1, &local_operand1);
		break;

	default:

		ACPI_ERROR((AE_INFO,
			    "Invalid object type for logical operator: %X",
			    operand0->common.type));
		status = AE_AML_INTERNAL;
		break;
	}

	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	/*
	 * Two cases: 1) Both Integers, 2) Both Strings or Buffers
	 */
	if (operand0->common.type == ACPI_TYPE_INTEGER) {
		/*
		 * 1) Both operands are of type integer
		 *    Note: local_operand1 may have changed above
		 */
		integer0 = operand0->integer.value;
		integer1 = local_operand1->integer.value;

		switch (opcode) {
		case AML_LOGICAL_EQUAL_OP:	/* LEqual (Operand0, Operand1) */

			if (integer0 == integer1) {
				local_result = TRUE;
			}
			break;

		case AML_LOGICAL_GREATER_OP:	/* LGreater (Operand0, Operand1) */

			if (integer0 > integer1) {
				local_result = TRUE;
			}
			break;

		case AML_LOGICAL_LESS_OP:	/* LLess (Operand0, Operand1) */

			if (integer0 < integer1) {
				local_result = TRUE;
			}
			break;

		default:

			ACPI_ERROR((AE_INFO,
				    "Invalid comparison opcode: %X", opcode));
			status = AE_AML_INTERNAL;
			break;
		}
	} else {
		/*
		 * 2) Both operands are Strings or both are Buffers
		 *    Note: Code below takes advantage of common Buffer/String
		 *          object fields. local_operand1 may have changed above. Use
		 *          memcmp to handle nulls in buffers.
		 */
		length0 = operand0->buffer.length;
		length1 = local_operand1->buffer.length;

		/* Lexicographic compare: compare the data bytes */

		compare = memcmp(operand0->buffer.pointer,
				 local_operand1->buffer.pointer,
				 (length0 > length1) ? length1 : length0);

		switch (opcode) {
		case AML_LOGICAL_EQUAL_OP:	/* LEqual (Operand0, Operand1) */

			/* Length and all bytes must be equal */

			if ((length0 == length1) && (compare == 0)) {

				/* Length and all bytes match ==> TRUE */

				local_result = TRUE;
			}
			break;

		case AML_LOGICAL_GREATER_OP:	/* LGreater (Operand0, Operand1) */

			if (compare > 0) {
				local_result = TRUE;
				goto cleanup;	/* TRUE */
			}
			if (compare < 0) {
				goto cleanup;	/* FALSE */
			}

			/* Bytes match (to shortest length), compare lengths */

			if (length0 > length1) {
				local_result = TRUE;
			}
			break;

		case AML_LOGICAL_LESS_OP:	/* LLess (Operand0, Operand1) */

			if (compare > 0) {
				goto cleanup;	/* FALSE */
			}
			if (compare < 0) {
				local_result = TRUE;
				goto cleanup;	/* TRUE */
			}

			/* Bytes match (to shortest length), compare lengths */

			if (length0 < length1) {
				local_result = TRUE;
			}
			break;

		default:

			ACPI_ERROR((AE_INFO,
				    "Invalid comparison opcode: %X", opcode));
			status = AE_AML_INTERNAL;
			break;
		}
	}

cleanup:

	/* New object was created if implicit conversion performed - delete */

	if (local_operand1 != operand1) {
		acpi_ut_remove_reference(local_operand1);
	}

	/* Return the logical result and status */

	*logical_result = local_result;
	return_ACPI_STATUS(status);
}