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/drivers/acpi/executer/exoparg6.c

https://bitbucket.org/evzijst/gittest
C | 336 lines | 122 code | 66 blank | 148 comment | 15 complexity | a1cdf51fce0764b118e689618c43cf89 MD5 | raw file
  1
  2/******************************************************************************
  3 *
  4 * Module Name: exoparg6 - AML execution - opcodes with 6 arguments
  5 *
  6 *****************************************************************************/
  7
  8/*
  9 * Copyright (C) 2000 - 2005, R. Byron Moore
 10 * All rights reserved.
 11 *
 12 * Redistribution and use in source and binary forms, with or without
 13 * modification, are permitted provided that the following conditions
 14 * are met:
 15 * 1. Redistributions of source code must retain the above copyright
 16 *    notice, this list of conditions, and the following disclaimer,
 17 *    without modification.
 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 19 *    substantially similar to the "NO WARRANTY" disclaimer below
 20 *    ("Disclaimer") and any redistribution must be conditioned upon
 21 *    including a substantially similar Disclaimer requirement for further
 22 *    binary redistribution.
 23 * 3. Neither the names of the above-listed copyright holders nor the names
 24 *    of any contributors may be used to endorse or promote products derived
 25 *    from this software without specific prior written permission.
 26 *
 27 * Alternatively, this software may be distributed under the terms of the
 28 * GNU General Public License ("GPL") version 2 as published by the Free
 29 * Software Foundation.
 30 *
 31 * NO WARRANTY
 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 42 * POSSIBILITY OF SUCH DAMAGES.
 43 */
 44
 45
 46#include <acpi/acpi.h>
 47#include <acpi/acinterp.h>
 48#include <acpi/acparser.h>
 49#include <acpi/amlcode.h>
 50
 51
 52#define _COMPONENT          ACPI_EXECUTER
 53	 ACPI_MODULE_NAME    ("exoparg6")
 54
 55
 56/*!
 57 * Naming convention for AML interpreter execution routines.
 58 *
 59 * The routines that begin execution of AML opcodes are named with a common
 60 * convention based upon the number of arguments, the number of target operands,
 61 * and whether or not a value is returned:
 62 *
 63 *      AcpiExOpcode_xA_yT_zR
 64 *
 65 * Where:
 66 *
 67 * xA - ARGUMENTS:    The number of arguments (input operands) that are
 68 *                    required for this opcode type (1 through 6 args).
 69 * yT - TARGETS:      The number of targets (output operands) that are required
 70 *                    for this opcode type (0, 1, or 2 targets).
 71 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
 72 *                    as the function return (0 or 1).
 73 *
 74 * The AcpiExOpcode* functions are called via the Dispatcher component with
 75 * fully resolved operands.
 76!*/
 77
 78
 79/*******************************************************************************
 80 *
 81 * FUNCTION:    acpi_ex_do_match
 82 *
 83 * PARAMETERS:  match_op        - The AML match operand
 84 *              package_obj     - Object from the target package
 85 *              match_obj       - Object to be matched
 86 *
 87 * RETURN:      TRUE if the match is successful, FALSE otherwise
 88 *
 89 * DESCRIPTION: Implements the low-level match for the ASL Match operator.
 90 *              Package elements will be implicitly converted to the type of
 91 *              the match object (Integer/Buffer/String).
 92 *
 93 ******************************************************************************/
 94
 95u8
 96acpi_ex_do_match (
 97	u32                             match_op,
 98	union acpi_operand_object       *package_obj,
 99	union acpi_operand_object       *match_obj)
100{
101	u8                              logical_result = TRUE;
102	acpi_status                     status;
103
104
105	/*
106	 * Note: Since the package_obj/match_obj ordering is opposite to that of
107	 * the standard logical operators, we have to reverse them when we call
108	 * do_logical_op in order to make the implicit conversion rules work
109	 * correctly. However, this means we have to flip the entire equation
110	 * also. A bit ugly perhaps, but overall, better than fussing the
111	 * parameters around at runtime, over and over again.
112	 *
113	 * Below, P[i] refers to the package element, M refers to the Match object.
114	 */
115	switch (match_op) {
116	case MATCH_MTR:
117
118		/* Always true */
119
120		break;
121
122	case MATCH_MEQ:
123
124		/*
125		 * True if equal: (P[i] == M)
126		 * Change to:     (M == P[i])
127		 */
128		status = acpi_ex_do_logical_op (AML_LEQUAL_OP, match_obj, package_obj,
129				 &logical_result);
130		if (ACPI_FAILURE (status)) {
131			return (FALSE);
132		}
133		break;
134
135	case MATCH_MLE:
136
137		/*
138		 * True if less than or equal: (P[i] <= M) (P[i] not_greater than M)
139		 * Change to:                  (M >= P[i]) (M not_less than P[i])
140		 */
141		status = acpi_ex_do_logical_op (AML_LLESS_OP, match_obj, package_obj,
142				 &logical_result);
143		if (ACPI_FAILURE (status)) {
144			return (FALSE);
145		}
146		logical_result = (u8) !logical_result;
147		break;
148
149	case MATCH_MLT:
150
151		/*
152		 * True if less than: (P[i] < M)
153		 * Change to:         (M > P[i])
154		 */
155		status = acpi_ex_do_logical_op (AML_LGREATER_OP, match_obj, package_obj,
156				 &logical_result);
157		if (ACPI_FAILURE (status)) {
158			return (FALSE);
159		}
160		break;
161
162	case MATCH_MGE:
163
164		/*
165		 * True if greater than or equal: (P[i] >= M) (P[i] not_less than M)
166		 * Change to:                     (M <= P[i]) (M not_greater than P[i])
167		 */
168		status = acpi_ex_do_logical_op (AML_LGREATER_OP, match_obj, package_obj,
169				 &logical_result);
170		if (ACPI_FAILURE (status)) {
171			return (FALSE);
172		}
173		logical_result = (u8)!logical_result;
174		break;
175
176	case MATCH_MGT:
177
178		/*
179		 * True if greater than: (P[i] > M)
180		 * Change to:            (M < P[i])
181		 */
182		status = acpi_ex_do_logical_op (AML_LLESS_OP, match_obj, package_obj,
183				 &logical_result);
184		if (ACPI_FAILURE (status)) {
185			return (FALSE);
186		}
187		break;
188
189	default:
190
191		/* Undefined */
192
193		return (FALSE);
194	}
195
196	return logical_result;
197}
198
199
200/*******************************************************************************
201 *
202 * FUNCTION:    acpi_ex_opcode_6A_0T_1R
203 *
204 * PARAMETERS:  walk_state          - Current walk state
205 *
206 * RETURN:      Status
207 *
208 * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value
209 *
210 ******************************************************************************/
211
212acpi_status
213acpi_ex_opcode_6A_0T_1R (
214	struct acpi_walk_state          *walk_state)
215{
216	union acpi_operand_object       **operand = &walk_state->operands[0];
217	union acpi_operand_object       *return_desc = NULL;
218	acpi_status                     status = AE_OK;
219	u32                             index;
220	union acpi_operand_object       *this_element;
221
222
223	ACPI_FUNCTION_TRACE_STR ("ex_opcode_6A_0T_1R", acpi_ps_get_opcode_name (walk_state->opcode));
224
225
226	switch (walk_state->opcode) {
227	case AML_MATCH_OP:
228		/*
229		 * Match (search_pkg[0], match_op1[1], match_obj1[2],
230		 *                      match_op2[3], match_obj2[4], start_index[5])
231		 */
232
233		/* Validate both Match Term Operators (MTR, MEQ, etc.) */
234
235		if ((operand[1]->integer.value > MAX_MATCH_OPERATOR) ||
236			(operand[3]->integer.value > MAX_MATCH_OPERATOR)) {
237			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Match operator out of range\n"));
238			status = AE_AML_OPERAND_VALUE;
239			goto cleanup;
240		}
241
242		/* Get the package start_index, validate against the package length */
243
244		index = (u32) operand[5]->integer.value;
245		if (index >= (u32) operand[0]->package.count) {
246			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Index beyond package end\n"));
247			status = AE_AML_PACKAGE_LIMIT;
248			goto cleanup;
249		}
250
251		/* Create an integer for the return value */
252
253		return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
254		if (!return_desc) {
255			status = AE_NO_MEMORY;
256			goto cleanup;
257
258		}
259
260		/* Default return value if no match found */
261
262		return_desc->integer.value = ACPI_INTEGER_MAX;
263
264		/*
265		 * Examine each element until a match is found. Both match conditions
266		 * must be satisfied for a match to occur. Within the loop,
267		 * "continue" signifies that the current element does not match
268		 * and the next should be examined.
269		 *
270		 * Upon finding a match, the loop will terminate via "break" at
271		 * the bottom.  If it terminates "normally", match_value will be
272		 * ACPI_INTEGER_MAX (Ones) (its initial value) indicating that no
273		 * match was found.
274		 */
275		for ( ; index < operand[0]->package.count; index++) {
276			/* Get the current package element */
277
278			this_element = operand[0]->package.elements[index];
279
280			/* Treat any uninitialized (NULL) elements as non-matching */
281
282			if (!this_element) {
283				continue;
284			}
285
286			/*
287			 * Both match conditions must be satisfied. Execution of a continue
288			 * (proceed to next iteration of enclosing for loop) signifies a
289			 * non-match.
290			 */
291			if (!acpi_ex_do_match ((u32) operand[1]->integer.value,
292					   this_element, operand[2])) {
293				continue;
294			}
295
296			if (!acpi_ex_do_match ((u32) operand[3]->integer.value,
297					   this_element, operand[4])) {
298				continue;
299			}
300
301			/* Match found: Index is the return value */
302
303			return_desc->integer.value = index;
304			break;
305		}
306		break;
307
308
309	case AML_LOAD_TABLE_OP:
310
311		status = acpi_ex_load_table_op (walk_state, &return_desc);
312		break;
313
314
315	default:
316
317		ACPI_REPORT_ERROR (("acpi_ex_opcode_3A_0T_0R: Unknown opcode %X\n",
318				walk_state->opcode));
319		status = AE_AML_BAD_OPCODE;
320		goto cleanup;
321	}
322
323
324	walk_state->result_obj = return_desc;
325
326
327cleanup:
328
329	/* Delete return object on error */
330
331	if (ACPI_FAILURE (status)) {
332		acpi_ut_remove_reference (return_desc);
333	}
334
335	return_ACPI_STATUS (status);
336}