2 /******************************************************************************
4 * Module Name: exoparg3 - AML execution - opcodes with 3 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
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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45 #include <acpi/acpi.h>
51 #define _COMPONENT ACPI_EXECUTER
52 ACPI_MODULE_NAME("exoparg3")
55 * Naming convention for AML interpreter execution routines.
57 * The routines that begin execution of AML opcodes are named with a common
58 * convention based upon the number of arguments, the number of target operands,
59 * and whether or not a value is returned:
61 * AcpiExOpcode_xA_yT_zR
65 * xA - ARGUMENTS: The number of arguments (input operands) that are
66 * required for this opcode type (1 through 6 args).
67 * yT - TARGETS: The number of targets (output operands) that are required
68 * for this opcode type (0, 1, or 2 targets).
69 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
70 * as the function return (0 or 1).
72 * The AcpiExOpcode* functions are called via the Dispatcher component with
73 * fully resolved operands.
75 /*******************************************************************************
77 * FUNCTION: acpi_ex_opcode_3A_0T_0R
79 * PARAMETERS: walk_state - Current walk state
83 * DESCRIPTION: Execute Triadic operator (3 operands)
85 ******************************************************************************/
86 acpi_status
acpi_ex_opcode_3A_0T_0R(struct acpi_walk_state
*walk_state
)
88 union acpi_operand_object
**operand
= &walk_state
->operands
[0];
89 struct acpi_signal_fatal_info
*fatal
;
90 acpi_status status
= AE_OK
;
92 ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_0T_0R
,
93 acpi_ps_get_opcode_name(walk_state
->opcode
));
95 switch (walk_state
->opcode
) {
96 case AML_FATAL_OP
: /* Fatal (fatal_type fatal_code fatal_arg) */
98 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
99 "FatalOp: Type %X Code %X Arg %X <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
100 (u32
) operand
[0]->integer
.value
,
101 (u32
) operand
[1]->integer
.value
,
102 (u32
) operand
[2]->integer
.value
));
104 fatal
= ACPI_ALLOCATE(sizeof(struct acpi_signal_fatal_info
));
106 fatal
->type
= (u32
) operand
[0]->integer
.value
;
107 fatal
->code
= (u32
) operand
[1]->integer
.value
;
108 fatal
->argument
= (u32
) operand
[2]->integer
.value
;
111 /* Always signal the OS! */
113 status
= acpi_os_signal(ACPI_SIGNAL_FATAL
, fatal
);
115 /* Might return while OS is shutting down, just continue */
122 ACPI_ERROR((AE_INFO
, "Unknown AML opcode %X",
123 walk_state
->opcode
));
124 status
= AE_AML_BAD_OPCODE
;
130 return_ACPI_STATUS(status
);
133 /*******************************************************************************
135 * FUNCTION: acpi_ex_opcode_3A_1T_1R
137 * PARAMETERS: walk_state - Current walk state
141 * DESCRIPTION: Execute Triadic operator (3 operands)
143 ******************************************************************************/
145 acpi_status
acpi_ex_opcode_3A_1T_1R(struct acpi_walk_state
*walk_state
)
147 union acpi_operand_object
**operand
= &walk_state
->operands
[0];
148 union acpi_operand_object
*return_desc
= NULL
;
150 acpi_status status
= AE_OK
;
154 ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_1T_1R
,
155 acpi_ps_get_opcode_name(walk_state
->opcode
));
157 switch (walk_state
->opcode
) {
158 case AML_MID_OP
: /* Mid (Source[0], Index[1], Length[2], Result[3]) */
161 * Create the return object. The Source operand is guaranteed to be
162 * either a String or a Buffer, so just use its type.
165 acpi_ut_create_internal_object(ACPI_GET_OBJECT_TYPE
168 status
= AE_NO_MEMORY
;
172 /* Get the Integer values from the objects */
174 index
= operand
[1]->integer
.value
;
175 length
= (acpi_size
) operand
[2]->integer
.value
;
178 * If the index is beyond the length of the String/Buffer, or if the
179 * requested length is zero, return a zero-length String/Buffer
181 if (index
>= operand
[0]->string
.length
) {
185 /* Truncate request if larger than the actual String/Buffer */
187 else if ((index
+ length
) > operand
[0]->string
.length
) {
188 length
= (acpi_size
) operand
[0]->string
.length
-
192 /* Strings always have a sub-pointer, not so for buffers */
194 switch (ACPI_GET_OBJECT_TYPE(operand
[0])) {
195 case ACPI_TYPE_STRING
:
197 /* Always allocate a new buffer for the String */
199 buffer
= ACPI_ALLOCATE_ZEROED((acpi_size
) length
+ 1);
201 status
= AE_NO_MEMORY
;
206 case ACPI_TYPE_BUFFER
:
208 /* If the requested length is zero, don't allocate a buffer */
212 /* Allocate a new buffer for the Buffer */
214 buffer
= ACPI_ALLOCATE_ZEROED(length
);
216 status
= AE_NO_MEMORY
;
222 default: /* Should not happen */
224 status
= AE_AML_OPERAND_TYPE
;
230 /* We have a buffer, copy the portion requested */
232 ACPI_MEMCPY(buffer
, operand
[0]->string
.pointer
+ index
,
236 /* Set the length of the new String/Buffer */
238 return_desc
->string
.pointer
= buffer
;
239 return_desc
->string
.length
= (u32
) length
;
241 /* Mark buffer initialized */
243 return_desc
->buffer
.flags
|= AOPOBJ_DATA_VALID
;
248 ACPI_ERROR((AE_INFO
, "Unknown AML opcode %X",
249 walk_state
->opcode
));
250 status
= AE_AML_BAD_OPCODE
;
254 /* Store the result in the target */
256 status
= acpi_ex_store(return_desc
, operand
[3], walk_state
);
260 /* Delete return object on error */
262 if (ACPI_FAILURE(status
) || walk_state
->result_obj
) {
263 acpi_ut_remove_reference(return_desc
);
264 walk_state
->result_obj
= NULL
;
267 /* Set the return object and exit */
270 walk_state
->result_obj
= return_desc
;
272 return_ACPI_STATUS(status
);
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