1 /******************************************************************************
3 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments
5 *****************************************************************************/
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51 #define _COMPONENT ACPI_EXECUTER
52 ACPI_MODULE_NAME ("exoparg3")
56 * Naming convention for AML interpreter execution routines.
58 * The routines that begin execution of AML opcodes are named with a common
59 * convention based upon the number of arguments, the number of target operands,
60 * and whether or not a value is returned:
62 * AcpiExOpcode_xA_yT_zR
66 * xA - ARGUMENTS: The number of arguments (input operands) that are
67 * required for this opcode type (1 through 6 args).
68 * yT - TARGETS: The number of targets (output operands) that are required
69 * for this opcode type (0, 1, or 2 targets).
70 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
71 * as the function return (0 or 1).
73 * The AcpiExOpcode* functions are called via the Dispatcher component with
74 * fully resolved operands.
78 /*******************************************************************************
80 * FUNCTION: AcpiExOpcode_3A_0T_0R
82 * PARAMETERS: WalkState - Current walk state
86 * DESCRIPTION: Execute Triadic operator (3 operands)
88 ******************************************************************************/
91 AcpiExOpcode_3A_0T_0R (
92 ACPI_WALK_STATE *WalkState)
94 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
95 ACPI_SIGNAL_FATAL_INFO *Fatal;
96 ACPI_STATUS Status = AE_OK;
99 ACPI_FUNCTION_TRACE_STR (ExOpcode_3A_0T_0R,
100 AcpiPsGetOpcodeName (WalkState->Opcode));
103 switch (WalkState->Opcode)
105 case AML_FATAL_OP: /* Fatal (FatalType FatalCode FatalArg) */
107 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
108 "FatalOp: Type %X Code %X Arg %X <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
109 (UINT32) Operand[0]->Integer.Value,
110 (UINT32) Operand[1]->Integer.Value,
111 (UINT32) Operand[2]->Integer.Value));
113 Fatal = ACPI_ALLOCATE (sizeof (ACPI_SIGNAL_FATAL_INFO));
116 Fatal->Type = (UINT32) Operand[0]->Integer.Value;
117 Fatal->Code = (UINT32) Operand[1]->Integer.Value;
118 Fatal->Argument = (UINT32) Operand[2]->Integer.Value;
121 /* Always signal the OS! */
123 Status = AcpiOsSignal (ACPI_SIGNAL_FATAL, Fatal);
125 /* Might return while OS is shutting down, just continue */
132 ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
134 Status = AE_AML_BAD_OPCODE;
141 return_ACPI_STATUS (Status);
145 /*******************************************************************************
147 * FUNCTION: AcpiExOpcode_3A_1T_1R
149 * PARAMETERS: WalkState - Current walk state
153 * DESCRIPTION: Execute Triadic operator (3 operands)
155 ******************************************************************************/
158 AcpiExOpcode_3A_1T_1R (
159 ACPI_WALK_STATE *WalkState)
161 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
162 ACPI_OPERAND_OBJECT *ReturnDesc = NULL;
164 ACPI_STATUS Status = AE_OK;
169 ACPI_FUNCTION_TRACE_STR (ExOpcode_3A_1T_1R,
170 AcpiPsGetOpcodeName (WalkState->Opcode));
173 switch (WalkState->Opcode)
175 case AML_MID_OP: /* Mid (Source[0], Index[1], Length[2], Result[3]) */
177 * Create the return object. The Source operand is guaranteed to be
178 * either a String or a Buffer, so just use its type.
180 ReturnDesc = AcpiUtCreateInternalObject (
181 (Operand[0])->Common.Type);
184 Status = AE_NO_MEMORY;
188 /* Get the Integer values from the objects */
190 Index = Operand[1]->Integer.Value;
191 Length = (ACPI_SIZE) Operand[2]->Integer.Value;
194 * If the index is beyond the length of the String/Buffer, or if the
195 * requested length is zero, return a zero-length String/Buffer
197 if (Index >= Operand[0]->String.Length)
202 /* Truncate request if larger than the actual String/Buffer */
204 else if ((Index + Length) > Operand[0]->String.Length)
206 Length = (ACPI_SIZE) Operand[0]->String.Length -
210 /* Strings always have a sub-pointer, not so for buffers */
212 switch ((Operand[0])->Common.Type)
214 case ACPI_TYPE_STRING:
216 /* Always allocate a new buffer for the String */
218 Buffer = ACPI_ALLOCATE_ZEROED ((ACPI_SIZE) Length + 1);
221 Status = AE_NO_MEMORY;
226 case ACPI_TYPE_BUFFER:
228 /* If the requested length is zero, don't allocate a buffer */
232 /* Allocate a new buffer for the Buffer */
234 Buffer = ACPI_ALLOCATE_ZEROED (Length);
237 Status = AE_NO_MEMORY;
243 default: /* Should not happen */
245 Status = AE_AML_OPERAND_TYPE;
251 /* We have a buffer, copy the portion requested */
253 ACPI_MEMCPY (Buffer, Operand[0]->String.Pointer + Index,
257 /* Set the length of the new String/Buffer */
259 ReturnDesc->String.Pointer = Buffer;
260 ReturnDesc->String.Length = (UINT32) Length;
262 /* Mark buffer initialized */
264 ReturnDesc->Buffer.Flags |= AOPOBJ_DATA_VALID;
269 ACPI_ERROR ((AE_INFO, "Unknown AML opcode 0x%X",
271 Status = AE_AML_BAD_OPCODE;
275 /* Store the result in the target */
277 Status = AcpiExStore (ReturnDesc, Operand[3], WalkState);
281 /* Delete return object on error */
283 if (ACPI_FAILURE (Status) || WalkState->ResultObj)
285 AcpiUtRemoveReference (ReturnDesc);
286 WalkState->ResultObj = NULL;
289 /* Set the return object and exit */
293 WalkState->ResultObj = ReturnDesc;
295 return_ACPI_STATUS (Status);