1 /******************************************************************************
3 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2013, Intel Corp.
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44 #include <acpi/acpi.h>
50 #define _COMPONENT ACPI_EXECUTER
51 ACPI_MODULE_NAME("exoparg3")
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 /*******************************************************************************
76 * FUNCTION: acpi_ex_opcode_3A_0T_0R
78 * PARAMETERS: walk_state - Current walk state
82 * DESCRIPTION: Execute Triadic operator (3 operands)
84 ******************************************************************************/
85 acpi_status acpi_ex_opcode_3A_0T_0R(struct acpi_walk_state *walk_state)
87 union acpi_operand_object **operand = &walk_state->operands[0];
88 struct acpi_signal_fatal_info *fatal;
89 acpi_status status = AE_OK;
91 ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_0T_0R,
92 acpi_ps_get_opcode_name(walk_state->opcode));
94 switch (walk_state->opcode) {
95 case AML_FATAL_OP: /* Fatal (fatal_type fatal_code fatal_arg) */
97 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
98 "FatalOp: Type %X Code %X Arg %X <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
99 (u32) operand[0]->integer.value,
100 (u32) operand[1]->integer.value,
101 (u32) operand[2]->integer.value));
103 fatal = ACPI_ALLOCATE(sizeof(struct acpi_signal_fatal_info));
105 fatal->type = (u32) operand[0]->integer.value;
106 fatal->code = (u32) operand[1]->integer.value;
107 fatal->argument = (u32) operand[2]->integer.value;
110 /* Always signal the OS! */
112 status = acpi_os_signal(ACPI_SIGNAL_FATAL, fatal);
114 /* Might return while OS is shutting down, just continue */
121 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
122 walk_state->opcode));
123 status = AE_AML_BAD_OPCODE;
129 return_ACPI_STATUS(status);
132 /*******************************************************************************
134 * FUNCTION: acpi_ex_opcode_3A_1T_1R
136 * PARAMETERS: walk_state - Current walk state
140 * DESCRIPTION: Execute Triadic operator (3 operands)
142 ******************************************************************************/
144 acpi_status acpi_ex_opcode_3A_1T_1R(struct acpi_walk_state *walk_state)
146 union acpi_operand_object **operand = &walk_state->operands[0];
147 union acpi_operand_object *return_desc = NULL;
149 acpi_status status = AE_OK;
153 ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_1T_1R,
154 acpi_ps_get_opcode_name(walk_state->opcode));
156 switch (walk_state->opcode) {
157 case AML_MID_OP: /* Mid (Source[0], Index[1], Length[2], Result[3]) */
159 * Create the return object. The Source operand is guaranteed to be
160 * either a String or a Buffer, so just use its type.
162 return_desc = acpi_ut_create_internal_object((operand[0])->
165 status = AE_NO_MEMORY;
169 /* Get the Integer values from the objects */
171 index = operand[1]->integer.value;
172 length = (acpi_size) operand[2]->integer.value;
175 * If the index is beyond the length of the String/Buffer, or if the
176 * requested length is zero, return a zero-length String/Buffer
178 if (index >= operand[0]->string.length) {
182 /* Truncate request if larger than the actual String/Buffer */
184 else if ((index + length) > operand[0]->string.length) {
185 length = (acpi_size) operand[0]->string.length -
189 /* Strings always have a sub-pointer, not so for buffers */
191 switch ((operand[0])->common.type) {
192 case ACPI_TYPE_STRING:
194 /* Always allocate a new buffer for the String */
196 buffer = ACPI_ALLOCATE_ZEROED((acpi_size) length + 1);
198 status = AE_NO_MEMORY;
203 case ACPI_TYPE_BUFFER:
205 /* If the requested length is zero, don't allocate a buffer */
209 /* Allocate a new buffer for the Buffer */
211 buffer = ACPI_ALLOCATE_ZEROED(length);
213 status = AE_NO_MEMORY;
219 default: /* Should not happen */
221 status = AE_AML_OPERAND_TYPE;
227 /* We have a buffer, copy the portion requested */
229 ACPI_MEMCPY(buffer, operand[0]->string.pointer + index,
233 /* Set the length of the new String/Buffer */
235 return_desc->string.pointer = buffer;
236 return_desc->string.length = (u32) length;
238 /* Mark buffer initialized */
240 return_desc->buffer.flags |= AOPOBJ_DATA_VALID;
245 ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
246 walk_state->opcode));
247 status = AE_AML_BAD_OPCODE;
251 /* Store the result in the target */
253 status = acpi_ex_store(return_desc, operand[3], walk_state);
257 /* Delete return object on error */
259 if (ACPI_FAILURE(status) || walk_state->result_obj) {
260 acpi_ut_remove_reference(return_desc);
261 walk_state->result_obj = NULL;
264 /* Set the return object and exit */
267 walk_state->result_obj = return_desc;
269 return_ACPI_STATUS(status);