summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/exconcat.c
blob: 43711412722f35f8b0889851ced3ae803394af63 (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
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: exconcat - Concatenate-type AML operators
 *
 * Copyright (C) 2000 - 2020, Intel Corp.
 *
 *****************************************************************************/

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

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exconcat")

/* Local Prototypes */
static acpi_status
acpi_ex_convert_to_object_type_string(union acpi_operand_object *obj_desc,
				      union acpi_operand_object **result_desc);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_do_concatenate
 *
 * PARAMETERS:  operand0            - First source object
 *              operand1            - Second source object
 *              actual_return_desc  - Where to place the return object
 *              walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Concatenate two objects with the ACPI-defined conversion
 *              rules as necessary.
 * NOTE:
 * Per the ACPI spec (up to 6.1), Concatenate only supports Integer,
 * String, and Buffer objects. However, we support all objects here
 * as an extension. This improves the usefulness of both Concatenate
 * and the Printf/Fprintf macros. The extension returns a string
 * describing the object type for the other objects.
 * 02/2016.
 *
 ******************************************************************************/

acpi_status
acpi_ex_do_concatenate(union acpi_operand_object *operand0,
		       union acpi_operand_object *operand1,
		       union acpi_operand_object **actual_return_desc,
		       struct acpi_walk_state *walk_state)
{
	union acpi_operand_object *local_operand0 = operand0;
	union acpi_operand_object *local_operand1 = operand1;
	union acpi_operand_object *temp_operand1 = NULL;
	union acpi_operand_object *return_desc;
	char *buffer;
	acpi_object_type operand0_type;
	acpi_object_type operand1_type;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ex_do_concatenate);

	/* Operand 0 preprocessing */

	switch (operand0->common.type) {
	case ACPI_TYPE_INTEGER:
	case ACPI_TYPE_STRING:
	case ACPI_TYPE_BUFFER:

		operand0_type = operand0->common.type;
		break;

	default:

		/* For all other types, get the "object type" string */

		status =
		    acpi_ex_convert_to_object_type_string(operand0,
							  &local_operand0);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}

		operand0_type = ACPI_TYPE_STRING;
		break;
	}

	/* Operand 1 preprocessing */

	switch (operand1->common.type) {
	case ACPI_TYPE_INTEGER:
	case ACPI_TYPE_STRING:
	case ACPI_TYPE_BUFFER:

		operand1_type = operand1->common.type;
		break;

	default:

		/* For all other types, get the "object type" string */

		status =
		    acpi_ex_convert_to_object_type_string(operand1,
							  &local_operand1);
		if (ACPI_FAILURE(status)) {
			goto cleanup;
		}

		operand1_type = ACPI_TYPE_STRING;
		break;
	}

	/*
	 * Convert the second operand if necessary. The first operand (0)
	 * determines the type of the second operand (1) (See the Data Types
	 * section of the ACPI specification). Both object types are
	 * guaranteed to be either Integer/String/Buffer by the operand
	 * resolution mechanism.
	 */
	switch (operand0_type) {
	case ACPI_TYPE_INTEGER:

		status =
		    acpi_ex_convert_to_integer(local_operand1, &temp_operand1,
					       ACPI_IMPLICIT_CONVERSION);
		break;

	case ACPI_TYPE_BUFFER:

		status =
		    acpi_ex_convert_to_buffer(local_operand1, &temp_operand1);
		break;

	case ACPI_TYPE_STRING:

		switch (operand1_type) {
		case ACPI_TYPE_INTEGER:
		case ACPI_TYPE_STRING:
		case ACPI_TYPE_BUFFER:

			/* Other types have already been converted to string */

			status =
			    acpi_ex_convert_to_string(local_operand1,
						      &temp_operand1,
						      ACPI_IMPLICIT_CONVERT_HEX);
			break;

		default:

			status = AE_OK;
			break;
		}
		break;

	default:

		ACPI_ERROR((AE_INFO, "Invalid object type: 0x%X",
			    operand0->common.type));
		status = AE_AML_INTERNAL;
	}

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

	/* Take care with any newly created operand objects */

	if ((local_operand1 != operand1) && (local_operand1 != temp_operand1)) {
		acpi_ut_remove_reference(local_operand1);
	}

	local_operand1 = temp_operand1;

	/*
	 * Both operands are now known to be the same object type
	 * (Both are Integer, String, or Buffer), and we can now perform
	 * the concatenation.
	 *
	 * There are three cases to handle, as per the ACPI spec:
	 *
	 * 1) Two Integers concatenated to produce a new Buffer
	 * 2) Two Strings concatenated to produce a new String
	 * 3) Two Buffers concatenated to produce a new Buffer
	 */
	switch (operand0_type) {
	case ACPI_TYPE_INTEGER:

		/* Result of two Integers is a Buffer */
		/* Need enough buffer space for two integers */

		return_desc = acpi_ut_create_buffer_object((acpi_size)
							   ACPI_MUL_2
							   (acpi_gbl_integer_byte_width));
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		buffer = (char *)return_desc->buffer.pointer;

		/* Copy the first integer, LSB first */

		memcpy(buffer, &operand0->integer.value,
		       acpi_gbl_integer_byte_width);

		/* Copy the second integer (LSB first) after the first */

		memcpy(buffer + acpi_gbl_integer_byte_width,
		       &local_operand1->integer.value,
		       acpi_gbl_integer_byte_width);
		break;

	case ACPI_TYPE_STRING:

		/* Result of two Strings is a String */

		return_desc = acpi_ut_create_string_object(((acpi_size)
							    local_operand0->
							    string.length +
							    local_operand1->
							    string.length));
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		buffer = return_desc->string.pointer;

		/* Concatenate the strings */

		strcpy(buffer, local_operand0->string.pointer);
		strcat(buffer, local_operand1->string.pointer);
		break;

	case ACPI_TYPE_BUFFER:

		/* Result of two Buffers is a Buffer */

		return_desc = acpi_ut_create_buffer_object(((acpi_size)
							    operand0->buffer.
							    length +
							    local_operand1->
							    buffer.length));
		if (!return_desc) {
			status = AE_NO_MEMORY;
			goto cleanup;
		}

		buffer = (char *)return_desc->buffer.pointer;

		/* Concatenate the buffers */

		memcpy(buffer, operand0->buffer.pointer,
		       operand0->buffer.length);
		memcpy(buffer + operand0->buffer.length,
		       local_operand1->buffer.pointer,
		       local_operand1->buffer.length);
		break;

	default:

		/* Invalid object type, should not happen here */

		ACPI_ERROR((AE_INFO, "Invalid object type: 0x%X",
			    operand0->common.type));
		status = AE_AML_INTERNAL;
		goto cleanup;
	}

	*actual_return_desc = return_desc;

cleanup:
	if (local_operand0 != operand0) {
		acpi_ut_remove_reference(local_operand0);
	}

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

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_convert_to_object_type_string
 *
 * PARAMETERS:  obj_desc            - Object to be converted
 *              return_desc         - Where to place the return object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert an object of arbitrary type to a string object that
 *              contains the namestring for the object. Used for the
 *              concatenate operator.
 *
 ******************************************************************************/

static acpi_status
acpi_ex_convert_to_object_type_string(union acpi_operand_object *obj_desc,
				      union acpi_operand_object **result_desc)
{
	union acpi_operand_object *return_desc;
	const char *type_string;

	type_string = acpi_ut_get_type_name(obj_desc->common.type);

	return_desc = acpi_ut_create_string_object(((acpi_size)strlen(type_string) + 9));	/* 9 For "[ Object]" */
	if (!return_desc) {
		return (AE_NO_MEMORY);
	}

	strcpy(return_desc->string.pointer, "[");
	strcat(return_desc->string.pointer, type_string);
	strcat(return_desc->string.pointer, " Object]");

	*result_desc = return_desc;
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_concat_template
 *
 * PARAMETERS:  operand0            - First source object
 *              operand1            - Second source object
 *              actual_return_desc  - Where to place the return object
 *              walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Concatenate two resource templates
 *
 ******************************************************************************/

acpi_status
acpi_ex_concat_template(union acpi_operand_object *operand0,
			union acpi_operand_object *operand1,
			union acpi_operand_object **actual_return_desc,
			struct acpi_walk_state *walk_state)
{
	acpi_status status;
	union acpi_operand_object *return_desc;
	u8 *new_buf;
	u8 *end_tag;
	acpi_size length0;
	acpi_size length1;
	acpi_size new_length;

	ACPI_FUNCTION_TRACE(ex_concat_template);

	/*
	 * Find the end_tag descriptor in each resource template.
	 * Note1: returned pointers point TO the end_tag, not past it.
	 * Note2: zero-length buffers are allowed; treated like one end_tag
	 */

	/* Get the length of the first resource template */

	status = acpi_ut_get_resource_end_tag(operand0, &end_tag);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	length0 = ACPI_PTR_DIFF(end_tag, operand0->buffer.pointer);

	/* Get the length of the second resource template */

	status = acpi_ut_get_resource_end_tag(operand1, &end_tag);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	length1 = ACPI_PTR_DIFF(end_tag, operand1->buffer.pointer);

	/* Combine both lengths, minimum size will be 2 for end_tag */

	new_length = length0 + length1 + sizeof(struct aml_resource_end_tag);

	/* Create a new buffer object for the result (with one end_tag) */

	return_desc = acpi_ut_create_buffer_object(new_length);
	if (!return_desc) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/*
	 * Copy the templates to the new buffer, 0 first, then 1 follows. One
	 * end_tag descriptor is copied from Operand1.
	 */
	new_buf = return_desc->buffer.pointer;
	memcpy(new_buf, operand0->buffer.pointer, length0);
	memcpy(new_buf + length0, operand1->buffer.pointer, length1);

	/* Insert end_tag and set the checksum to zero, means "ignore checksum" */

	new_buf[new_length - 1] = 0;
	new_buf[new_length - 2] = ACPI_RESOURCE_NAME_END_TAG | 1;

	/* Return the completed resource template */

	*actual_return_desc = return_desc;
	return_ACPI_STATUS(AE_OK);
}