2 /******************************************************************************
4 * Module Name: exoparg6 - AML execution - opcodes with 6 arguments
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2005, R. Byron Moore
10 * All rights reserved.
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13 * modification, are permitted provided that the following conditions
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17 * without modification.
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21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
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24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
27 * Alternatively, this software may be distributed under the terms of the
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46 #include <acpi/acpi.h>
47 #include <acpi/acinterp.h>
48 #include <acpi/acparser.h>
49 #include <acpi/amlcode.h>
52 #define _COMPONENT ACPI_EXECUTER
53 ACPI_MODULE_NAME ("exoparg6")
57 * Naming convention for AML interpreter execution routines.
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:
63 * AcpiExOpcode_xA_yT_zR
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).
74 * The AcpiExOpcode* functions are called via the Dispatcher component with
75 * fully resolved operands.
79 /*******************************************************************************
81 * FUNCTION: acpi_ex_do_match
83 * PARAMETERS: match_op - The AML match operand
84 * package_obj - Object from the target package
85 * match_obj - Object to be matched
87 * RETURN: TRUE if the match is successful, FALSE otherwise
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).
93 ******************************************************************************/
98 union acpi_operand_object *package_obj,
99 union acpi_operand_object *match_obj)
101 u8 logical_result = TRUE;
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.
113 * Below, P[i] refers to the package element, M refers to the Match object.
125 * True if equal: (P[i] == M)
126 * Change to: (M == P[i])
128 status = acpi_ex_do_logical_op (AML_LEQUAL_OP, match_obj, package_obj,
130 if (ACPI_FAILURE (status)) {
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])
141 status = acpi_ex_do_logical_op (AML_LLESS_OP, match_obj, package_obj,
143 if (ACPI_FAILURE (status)) {
146 logical_result = (u8) !logical_result;
152 * True if less than: (P[i] < M)
153 * Change to: (M > P[i])
155 status = acpi_ex_do_logical_op (AML_LGREATER_OP, match_obj, package_obj,
157 if (ACPI_FAILURE (status)) {
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])
168 status = acpi_ex_do_logical_op (AML_LGREATER_OP, match_obj, package_obj,
170 if (ACPI_FAILURE (status)) {
173 logical_result = (u8)!logical_result;
179 * True if greater than: (P[i] > M)
180 * Change to: (M < P[i])
182 status = acpi_ex_do_logical_op (AML_LLESS_OP, match_obj, package_obj,
184 if (ACPI_FAILURE (status)) {
196 return logical_result;
200 /*******************************************************************************
202 * FUNCTION: acpi_ex_opcode_6A_0T_1R
204 * PARAMETERS: walk_state - Current walk state
208 * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value
210 ******************************************************************************/
213 acpi_ex_opcode_6A_0T_1R (
214 struct acpi_walk_state *walk_state)
216 union acpi_operand_object **operand = &walk_state->operands[0];
217 union acpi_operand_object *return_desc = NULL;
218 acpi_status status = AE_OK;
220 union acpi_operand_object *this_element;
223 ACPI_FUNCTION_TRACE_STR ("ex_opcode_6A_0T_1R", acpi_ps_get_opcode_name (walk_state->opcode));
226 switch (walk_state->opcode) {
229 * Match (search_pkg[0], match_op1[1], match_obj1[2],
230 * match_op2[3], match_obj2[4], start_index[5])
233 /* Validate both Match Term Operators (MTR, MEQ, etc.) */
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;
242 /* Get the package start_index, validate against the package length */
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;
251 /* Create an integer for the return value */
253 return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
255 status = AE_NO_MEMORY;
260 /* Default return value if no match found */
262 return_desc->integer.value = ACPI_INTEGER_MAX;
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.
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
275 for ( ; index < operand[0]->package.count; index++) {
276 /* Get the current package element */
278 this_element = operand[0]->package.elements[index];
280 /* Treat any uninitialized (NULL) elements as non-matching */
287 * Both match conditions must be satisfied. Execution of a continue
288 * (proceed to next iteration of enclosing for loop) signifies a
291 if (!acpi_ex_do_match ((u32) operand[1]->integer.value,
292 this_element, operand[2])) {
296 if (!acpi_ex_do_match ((u32) operand[3]->integer.value,
297 this_element, operand[4])) {
301 /* Match found: Index is the return value */
303 return_desc->integer.value = index;
309 case AML_LOAD_TABLE_OP:
311 status = acpi_ex_load_table_op (walk_state, &return_desc);
317 ACPI_REPORT_ERROR (("acpi_ex_opcode_3A_0T_0R: Unknown opcode %X\n",
318 walk_state->opcode));
319 status = AE_AML_BAD_OPCODE;
324 walk_state->result_obj = return_desc;
329 /* Delete return object on error */
331 if (ACPI_FAILURE (status)) {
332 acpi_ut_remove_reference (return_desc);
335 return_ACPI_STATUS (status);