2 /******************************************************************************
4 * Module Name: exoparg6 - AML execution - opcodes with 6 arguments
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2008, Intel Corp.
10 * All rights reserved.
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13 * modification, are permitted provided that the following conditions
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21 * including a substantially similar Disclaimer requirement for further
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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.
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45 #include <acpi/acpi.h>
46 #include <acpi/acinterp.h>
47 #include <acpi/acparser.h>
48 #include <acpi/amlcode.h>
50 #define _COMPONENT ACPI_EXECUTER
51 ACPI_MODULE_NAME("exoparg6")
54 * Naming convention for AML interpreter execution routines.
56 * The routines that begin execution of AML opcodes are named with a common
57 * convention based upon the number of arguments, the number of target operands,
58 * and whether or not a value is returned:
60 * AcpiExOpcode_xA_yT_zR
64 * xA - ARGUMENTS: The number of arguments (input operands) that are
65 * required for this opcode type (1 through 6 args).
66 * yT - TARGETS: The number of targets (output operands) that are required
67 * for this opcode type (0, 1, or 2 targets).
68 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
69 * as the function return (0 or 1).
71 * The AcpiExOpcode* functions are called via the Dispatcher component with
72 * fully resolved operands.
74 /* Local prototypes */
76 acpi_ex_do_match(u32 match_op
,
77 union acpi_operand_object
*package_obj
,
78 union acpi_operand_object
*match_obj
);
80 /*******************************************************************************
82 * FUNCTION: acpi_ex_do_match
84 * PARAMETERS: match_op - The AML match operand
85 * package_obj - Object from the target package
86 * match_obj - Object to be matched
88 * RETURN: TRUE if the match is successful, FALSE otherwise
90 * DESCRIPTION: Implements the low-level match for the ASL Match operator.
91 * Package elements will be implicitly converted to the type of
92 * the match object (Integer/Buffer/String).
94 ******************************************************************************/
97 acpi_ex_do_match(u32 match_op
,
98 union acpi_operand_object
*package_obj
,
99 union acpi_operand_object
*match_obj
)
101 u8 logical_result
= TRUE
;
105 * Note: Since the package_obj/match_obj ordering is opposite to that of
106 * the standard logical operators, we have to reverse them when we call
107 * do_logical_op in order to make the implicit conversion rules work
108 * correctly. However, this means we have to flip the entire equation
109 * also. A bit ugly perhaps, but overall, better than fussing the
110 * parameters around at runtime, over and over again.
112 * Below, P[i] refers to the package element, M refers to the Match object.
124 * True if equal: (P[i] == M)
125 * Change to: (M == P[i])
128 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])
142 acpi_ex_do_logical_op(AML_LLESS_OP
, match_obj
, package_obj
,
144 if (ACPI_FAILURE(status
)) {
147 logical_result
= (u8
) ! logical_result
;
153 * True if less than: (P[i] < M)
154 * Change to: (M > P[i])
157 acpi_ex_do_logical_op(AML_LGREATER_OP
, match_obj
,
158 package_obj
, &logical_result
);
159 if (ACPI_FAILURE(status
)) {
167 * True if greater than or equal: (P[i] >= M) (P[i] not_less than M)
168 * Change to: (M <= P[i]) (M not_greater than P[i])
171 acpi_ex_do_logical_op(AML_LGREATER_OP
, match_obj
,
172 package_obj
, &logical_result
);
173 if (ACPI_FAILURE(status
)) {
176 logical_result
= (u8
) ! logical_result
;
182 * True if greater than: (P[i] > M)
183 * Change to: (M < P[i])
186 acpi_ex_do_logical_op(AML_LLESS_OP
, match_obj
, package_obj
,
188 if (ACPI_FAILURE(status
)) {
200 return logical_result
;
203 /*******************************************************************************
205 * FUNCTION: acpi_ex_opcode_6A_0T_1R
207 * PARAMETERS: walk_state - Current walk state
211 * DESCRIPTION: Execute opcode with 6 arguments, no target, and a return value
213 ******************************************************************************/
215 acpi_status
acpi_ex_opcode_6A_0T_1R(struct acpi_walk_state
* walk_state
)
217 union acpi_operand_object
**operand
= &walk_state
->operands
[0];
218 union acpi_operand_object
*return_desc
= NULL
;
219 acpi_status status
= AE_OK
;
221 union acpi_operand_object
*this_element
;
223 ACPI_FUNCTION_TRACE_STR(ex_opcode_6A_0T_1R
,
224 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_ERROR((AE_INFO
, "Match operator out of range"));
238 status
= AE_AML_OPERAND_VALUE
;
242 /* Get the package start_index, validate against the package length */
244 index
= operand
[5]->integer
.value
;
245 if (index
>= operand
[0]->package
.count
) {
247 "Index (%X%8.8X) beyond package end (%X)",
248 ACPI_FORMAT_UINT64(index
),
249 operand
[0]->package
.count
));
250 status
= AE_AML_PACKAGE_LIMIT
;
254 /* Create an integer for the return value */
256 return_desc
= acpi_ut_create_internal_object(ACPI_TYPE_INTEGER
);
258 status
= AE_NO_MEMORY
;
263 /* Default return value if no match found */
265 return_desc
->integer
.value
= ACPI_INTEGER_MAX
;
268 * Examine each element until a match is found. Both match conditions
269 * must be satisfied for a match to occur. Within the loop,
270 * "continue" signifies that the current element does not match
271 * and the next should be examined.
273 * Upon finding a match, the loop will terminate via "break" at
274 * the bottom. If it terminates "normally", match_value will be
275 * ACPI_INTEGER_MAX (Ones) (its initial value) indicating that no
278 for (; index
< operand
[0]->package
.count
; index
++) {
280 /* Get the current package element */
282 this_element
= operand
[0]->package
.elements
[index
];
284 /* Treat any uninitialized (NULL) elements as non-matching */
291 * Both match conditions must be satisfied. Execution of a continue
292 * (proceed to next iteration of enclosing for loop) signifies a
295 if (!acpi_ex_do_match((u32
) operand
[1]->integer
.value
,
296 this_element
, operand
[2])) {
300 if (!acpi_ex_do_match((u32
) operand
[3]->integer
.value
,
301 this_element
, operand
[4])) {
305 /* Match found: Index is the return value */
307 return_desc
->integer
.value
= index
;
312 case AML_LOAD_TABLE_OP
:
314 status
= acpi_ex_load_table_op(walk_state
, &return_desc
);
319 ACPI_ERROR((AE_INFO
, "Unknown AML opcode %X",
320 walk_state
->opcode
));
321 status
= AE_AML_BAD_OPCODE
;
327 /* Delete return object on error */
329 if (ACPI_FAILURE(status
)) {
330 acpi_ut_remove_reference(return_desc
);
333 /* Save return object on success */
336 walk_state
->result_obj
= return_desc
;
339 return_ACPI_STATUS(status
);
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