dsutils.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:20k
- /*******************************************************************************
- *
- * Module Name: dsutils - Dispatcher utilities
- * $Revision: 80 $
- *
- ******************************************************************************/
- /*
- * Copyright (C) 2000, 2001 R. Byron Moore
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "acpi.h"
- #include "acparser.h"
- #include "amlcode.h"
- #include "acdispat.h"
- #include "acinterp.h"
- #include "acnamesp.h"
- #include "acdebug.h"
- #define _COMPONENT ACPI_DISPATCHER
- MODULE_NAME ("dsutils")
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_is_result_used
- *
- * PARAMETERS: Op
- * Result_obj
- * Walk_state
- *
- * RETURN: Status
- *
- * DESCRIPTION: Check if a result object will be used by the parent
- *
- ******************************************************************************/
- u8
- acpi_ds_is_result_used (
- acpi_parse_object *op,
- acpi_walk_state *walk_state)
- {
- const acpi_opcode_info *parent_info;
- FUNCTION_TRACE_PTR ("Ds_is_result_used", op);
- /* Must have both an Op and a Result Object */
- if (!op) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null Opn"));
- return_VALUE (TRUE);
- }
- /*
- * If there is no parent, the result can't possibly be used!
- * (An executing method typically has no parent, since each
- * method is parsed separately) However, a method that is
- * invoked from another method has a parent.
- */
- if (!op->parent) {
- return_VALUE (FALSE);
- }
- /*
- * Get info on the parent. The root Op is AML_SCOPE
- */
- parent_info = acpi_ps_get_opcode_info (op->parent->opcode);
- if (parent_info->class == AML_CLASS_UNKNOWN) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown parent opcode. Op=%pn", op));
- return_VALUE (FALSE);
- }
- /*
- * Decide what to do with the result based on the parent. If
- * the parent opcode will not use the result, delete the object.
- * Otherwise leave it as is, it will be deleted when it is used
- * as an operand later.
- */
- switch (parent_info->class) {
- /*
- * In these cases, the parent will never use the return object
- */
- case AML_CLASS_CONTROL: /* IF, ELSE, WHILE only */
- switch (op->parent->opcode) {
- case AML_RETURN_OP:
- /* Never delete the return value associated with a return opcode */
- ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
- "Result used, [RETURN] opcode=%X Op=%pn", op->opcode, op));
- return_VALUE (TRUE);
- break;
- case AML_IF_OP:
- case AML_WHILE_OP:
- /*
- * If we are executing the predicate AND this is the predicate op,
- * we will use the return value!
- */
- if ((walk_state->control_state->common.state == CONTROL_PREDICATE_EXECUTING) &&
- (walk_state->control_state->control.predicate_op == op)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
- "Result used as a predicate, [IF/WHILE] opcode=%X Op=%pn",
- op->opcode, op));
- return_VALUE (TRUE);
- }
- break;
- }
- /* Fall through to not used case below */
- case AML_CLASS_NAMED_OBJECT: /* Scope, method, etc. */
- case AML_CLASS_CREATE:
- /*
- * These opcodes allow Term_arg(s) as operands and therefore
- * method calls. The result is used.
- */
- if ((op->parent->opcode == AML_REGION_OP) ||
- (op->parent->opcode == AML_CREATE_FIELD_OP) ||
- (op->parent->opcode == AML_CREATE_BIT_FIELD_OP) ||
- (op->parent->opcode == AML_CREATE_BYTE_FIELD_OP) ||
- (op->parent->opcode == AML_CREATE_WORD_FIELD_OP) ||
- (op->parent->opcode == AML_CREATE_DWORD_FIELD_OP) ||
- (op->parent->opcode == AML_CREATE_QWORD_FIELD_OP)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
- "Result used, [Region or Create_field] opcode=%X Op=%pn",
- op->opcode, op));
- return_VALUE (TRUE);
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
- "Result not used, Parent opcode=%X Op=%pn", op->opcode, op));
- return_VALUE (FALSE);
- break;
- /*
- * In all other cases. the parent will actually use the return
- * object, so keep it.
- */
- default:
- break;
- }
- return_VALUE (TRUE);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_delete_result_if_not_used
- *
- * PARAMETERS: Op
- * Result_obj
- * Walk_state
- *
- * RETURN: Status
- *
- * DESCRIPTION: Used after interpretation of an opcode. If there is an internal
- * result descriptor, check if the parent opcode will actually use
- * this result. If not, delete the result now so that it will
- * not become orphaned.
- *
- ******************************************************************************/
- void
- acpi_ds_delete_result_if_not_used (
- acpi_parse_object *op,
- acpi_operand_object *result_obj,
- acpi_walk_state *walk_state)
- {
- acpi_operand_object *obj_desc;
- acpi_status status;
- FUNCTION_TRACE_PTR ("Ds_delete_result_if_not_used", result_obj);
- if (!op) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null Opn"));
- return_VOID;
- }
- if (!result_obj) {
- return_VOID;
- }
- if (!acpi_ds_is_result_used (op, walk_state)) {
- /*
- * Must pop the result stack (Obj_desc should be equal to Result_obj)
- */
- status = acpi_ds_result_pop (&obj_desc, walk_state);
- if (ACPI_SUCCESS (status)) {
- acpi_ut_remove_reference (result_obj);
- }
- }
- return_VOID;
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_create_operand
- *
- * PARAMETERS: Walk_state
- * Arg
- *
- * RETURN: Status
- *
- * DESCRIPTION: Translate a parse tree object that is an argument to an AML
- * opcode to the equivalent interpreter object. This may include
- * looking up a name or entering a new name into the internal
- * namespace.
- *
- ******************************************************************************/
- acpi_status
- acpi_ds_create_operand (
- acpi_walk_state *walk_state,
- acpi_parse_object *arg,
- u32 arg_index)
- {
- acpi_status status = AE_OK;
- NATIVE_CHAR *name_string;
- u32 name_length;
- acpi_object_type8 data_type;
- acpi_operand_object *obj_desc;
- acpi_parse_object *parent_op;
- u16 opcode;
- u32 flags;
- operating_mode interpreter_mode;
- const acpi_opcode_info *op_info;
- FUNCTION_TRACE_PTR ("Ds_create_operand", arg);
- /* A valid name must be looked up in the namespace */
- if ((arg->opcode == AML_INT_NAMEPATH_OP) &&
- (arg->value.string)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Getting a name: Arg=%pn", arg));
- /* Get the entire name string from the AML stream */
- status = acpi_ex_get_name_string (ACPI_TYPE_ANY, arg->value.buffer,
- &name_string, &name_length);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /*
- * All prefixes have been handled, and the name is
- * in Name_string
- */
- /*
- * Differentiate between a namespace "create" operation
- * versus a "lookup" operation (IMODE_LOAD_PASS2 vs.
- * IMODE_EXECUTE) in order to support the creation of
- * namespace objects during the execution of control methods.
- */
- parent_op = arg->parent;
- op_info = acpi_ps_get_opcode_info (parent_op->opcode);
- if ((op_info->flags & AML_NSNODE) &&
- (parent_op->opcode != AML_INT_METHODCALL_OP) &&
- (parent_op->opcode != AML_REGION_OP) &&
- (parent_op->opcode != AML_INT_NAMEPATH_OP)) {
- /* Enter name into namespace if not found */
- interpreter_mode = IMODE_LOAD_PASS2;
- }
- else {
- /* Return a failure if name not found */
- interpreter_mode = IMODE_EXECUTE;
- }
- status = acpi_ns_lookup (walk_state->scope_info, name_string,
- ACPI_TYPE_ANY, interpreter_mode,
- NS_SEARCH_PARENT | NS_DONT_OPEN_SCOPE,
- walk_state,
- (acpi_namespace_node **) &obj_desc);
- /* Free the namestring created above */
- ACPI_MEM_FREE (name_string);
- /*
- * The only case where we pass through (ignore) a NOT_FOUND
- * error is for the Cond_ref_of opcode.
- */
- if (status == AE_NOT_FOUND) {
- if (parent_op->opcode == AML_COND_REF_OF_OP) {
- /*
- * For the Conditional Reference op, it's OK if
- * the name is not found; We just need a way to
- * indicate this to the interpreter, set the
- * object to the root
- */
- obj_desc = (acpi_operand_object *) acpi_gbl_root_node;
- status = AE_OK;
- }
- else {
- /*
- * We just plain didn't find it -- which is a
- * very serious error at this point
- */
- status = AE_AML_NAME_NOT_FOUND;
- /* TBD: Externalize Name_string and print */
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
- "Object name was not found in namespacen"));
- }
- }
- /* Check status from the lookup */
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- /* Put the resulting object onto the current object stack */
- status = acpi_ds_obj_stack_push (obj_desc, walk_state);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- DEBUGGER_EXEC (acpi_db_display_argument_object (obj_desc, walk_state));
- }
- else {
- /* Check for null name case */
- if (arg->opcode == AML_INT_NAMEPATH_OP) {
- /*
- * If the name is null, this means that this is an
- * optional result parameter that was not specified
- * in the original ASL. Create an Reference for a
- * placeholder
- */
- opcode = AML_ZERO_OP; /* Has no arguments! */
- ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Null namepath: Arg=%pn", arg));
- /*
- * TBD: [Investigate] anything else needed for the
- * zero op lvalue?
- */
- }
- else {
- opcode = arg->opcode;
- }
- /* Get the data type of the argument */
- data_type = acpi_ds_map_opcode_to_data_type (opcode, &flags);
- if (data_type == INTERNAL_TYPE_INVALID) {
- return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
- }
- if (flags & OP_HAS_RETURN_VALUE) {
- ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH,
- "Argument previously created, already stacked n"));
- DEBUGGER_EXEC (acpi_db_display_argument_object (walk_state->operands [walk_state->num_operands - 1], walk_state));
- /*
- * Use value that was already previously returned
- * by the evaluation of this argument
- */
- status = acpi_ds_result_pop_from_bottom (&obj_desc, walk_state);
- if (ACPI_FAILURE (status)) {
- /*
- * Only error is underflow, and this indicates
- * a missing or null operand!
- */
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Missing or null operand, %sn",
- acpi_format_exception (status)));
- return_ACPI_STATUS (status);
- }
- }
- else {
- /* Create an ACPI_INTERNAL_OBJECT for the argument */
- obj_desc = acpi_ut_create_internal_object (data_type);
- if (!obj_desc) {
- return_ACPI_STATUS (AE_NO_MEMORY);
- }
- /* Initialize the new object */
- status = acpi_ds_init_object_from_op (walk_state, arg,
- opcode, &obj_desc);
- if (ACPI_FAILURE (status)) {
- acpi_ut_delete_object_desc (obj_desc);
- return_ACPI_STATUS (status);
- }
- }
- /* Put the operand object on the object stack */
- status = acpi_ds_obj_stack_push (obj_desc, walk_state);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- DEBUGGER_EXEC (acpi_db_display_argument_object (obj_desc, walk_state));
- }
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_create_operands
- *
- * PARAMETERS: First_arg - First argument of a parser argument tree
- *
- * RETURN: Status
- *
- * DESCRIPTION: Convert an operator's arguments from a parse tree format to
- * namespace objects and place those argument object on the object
- * stack in preparation for evaluation by the interpreter.
- *
- ******************************************************************************/
- acpi_status
- acpi_ds_create_operands (
- acpi_walk_state *walk_state,
- acpi_parse_object *first_arg)
- {
- acpi_status status = AE_OK;
- acpi_parse_object *arg;
- u32 arg_count = 0;
- FUNCTION_TRACE_PTR ("Ds_create_operands", first_arg);
- /* For all arguments in the list... */
- arg = first_arg;
- while (arg) {
- status = acpi_ds_create_operand (walk_state, arg, arg_count);
- if (ACPI_FAILURE (status)) {
- goto cleanup;
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Arg #%d (%p) done, Arg1=%pn",
- arg_count, arg, first_arg));
- /* Move on to next argument, if any */
- arg = arg->next;
- arg_count++;
- }
- return_ACPI_STATUS (status);
- cleanup:
- /*
- * We must undo everything done above; meaning that we must
- * pop everything off of the operand stack and delete those
- * objects
- */
- acpi_ds_obj_stack_pop_and_delete (arg_count, walk_state);
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "While creating Arg %d - %sn",
- (arg_count + 1), acpi_format_exception (status)));
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_resolve_operands
- *
- * PARAMETERS: Walk_state - Current walk state with operands on stack
- *
- * RETURN: Status
- *
- * DESCRIPTION: Resolve all operands to their values. Used to prepare
- * arguments to a control method invocation (a call from one
- * method to another.)
- *
- ******************************************************************************/
- acpi_status
- acpi_ds_resolve_operands (
- acpi_walk_state *walk_state)
- {
- u32 i;
- acpi_status status = AE_OK;
- FUNCTION_TRACE_PTR ("Ds_resolve_operands", walk_state);
- /*
- * Attempt to resolve each of the valid operands
- * Method arguments are passed by value, not by reference
- */
- /*
- * TBD: [Investigate] Note from previous parser:
- * Ref_of problem with Acpi_ex_resolve_to_value() conversion.
- */
- for (i = 0; i < walk_state->num_operands; i++) {
- status = acpi_ex_resolve_to_value (&walk_state->operands[i], walk_state);
- if (ACPI_FAILURE (status)) {
- break;
- }
- }
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_map_opcode_to_data_type
- *
- * PARAMETERS: Opcode - AML opcode to map
- * Out_flags - Additional info about the opcode
- *
- * RETURN: The ACPI type associated with the opcode
- *
- * DESCRIPTION: Convert a raw AML opcode to the associated ACPI data type,
- * if any. If the opcode returns a value as part of the
- * intepreter execution, a flag is returned in Out_flags.
- *
- ******************************************************************************/
- acpi_object_type8
- acpi_ds_map_opcode_to_data_type (
- u16 opcode,
- u32 *out_flags)
- {
- acpi_object_type8 data_type = INTERNAL_TYPE_INVALID;
- const acpi_opcode_info *op_info;
- u32 flags = 0;
- PROC_NAME ("Ds_map_opcode_to_data_type");
- op_info = acpi_ps_get_opcode_info (opcode);
- if (op_info->class == AML_CLASS_UNKNOWN) {
- /* Unknown opcode */
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown AML opcode: %xn", opcode));
- return (data_type);
- }
- /*
- * TBD: Use op class
- */
- switch (op_info->type) {
- case AML_TYPE_LITERAL:
- switch (opcode) {
- case AML_BYTE_OP:
- case AML_WORD_OP:
- case AML_DWORD_OP:
- case AML_QWORD_OP:
- data_type = ACPI_TYPE_INTEGER;
- break;
- case AML_STRING_OP:
- data_type = ACPI_TYPE_STRING;
- break;
- case AML_INT_NAMEPATH_OP:
- data_type = INTERNAL_TYPE_REFERENCE;
- break;
- default:
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
- "Unknown (type LITERAL) AML opcode: %xn", opcode));
- break;
- }
- break;
- case AML_TYPE_DATA_TERM:
- switch (opcode) {
- case AML_BUFFER_OP:
- data_type = ACPI_TYPE_BUFFER;
- break;
- case AML_PACKAGE_OP:
- case AML_VAR_PACKAGE_OP:
- data_type = ACPI_TYPE_PACKAGE;
- break;
- default:
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
- "Unknown (type DATA_TERM) AML opcode: %xn", opcode));
- break;
- }
- break;
- case AML_TYPE_CONSTANT:
- case AML_TYPE_METHOD_ARGUMENT:
- case AML_TYPE_LOCAL_VARIABLE:
- data_type = INTERNAL_TYPE_REFERENCE;
- break;
- case AML_TYPE_EXEC_1A_0T_1R:
- case AML_TYPE_EXEC_1A_1T_1R:
- case AML_TYPE_EXEC_2A_0T_1R:
- case AML_TYPE_EXEC_2A_1T_1R:
- case AML_TYPE_EXEC_2A_2T_1R:
- case AML_TYPE_EXEC_3A_1T_1R:
- case AML_TYPE_EXEC_6A_0T_1R:
- case AML_TYPE_RETURN:
- flags = OP_HAS_RETURN_VALUE;
- data_type = ACPI_TYPE_ANY;
- break;
- case AML_TYPE_METHOD_CALL:
- flags = OP_HAS_RETURN_VALUE;
- data_type = ACPI_TYPE_METHOD;
- break;
- case AML_TYPE_NAMED_FIELD:
- case AML_TYPE_NAMED_SIMPLE:
- case AML_TYPE_NAMED_COMPLEX:
- case AML_TYPE_NAMED_NO_OBJ:
- data_type = acpi_ds_map_named_opcode_to_data_type (opcode);
- break;
- case AML_TYPE_EXEC_1A_0T_0R:
- case AML_TYPE_EXEC_2A_0T_0R:
- case AML_TYPE_EXEC_3A_0T_0R:
- case AML_TYPE_EXEC_1A_1T_0R:
- case AML_TYPE_CONTROL:
- /* No mapping needed at this time */
- break;
- default:
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
- "Unimplemented data type opcode: %xn", opcode));
- break;
- }
- /* Return flags to caller if requested */
- if (out_flags) {
- *out_flags = flags;
- }
- return (data_type);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ds_map_named_opcode_to_data_type
- *
- * PARAMETERS: Opcode - The Named AML opcode to map
- *
- * RETURN: The ACPI type associated with the named opcode
- *
- * DESCRIPTION: Convert a raw Named AML opcode to the associated data type.
- * Named opcodes are a subsystem of the AML opcodes.
- *
- ******************************************************************************/
- acpi_object_type8
- acpi_ds_map_named_opcode_to_data_type (
- u16 opcode)
- {
- acpi_object_type8 data_type;
- FUNCTION_ENTRY ();
- /* Decode Opcode */
- switch (opcode) {
- case AML_SCOPE_OP:
- data_type = INTERNAL_TYPE_SCOPE;
- break;
- case AML_DEVICE_OP:
- data_type = ACPI_TYPE_DEVICE;
- break;
- case AML_THERMAL_ZONE_OP:
- data_type = ACPI_TYPE_THERMAL;
- break;
- case AML_METHOD_OP:
- data_type = ACPI_TYPE_METHOD;
- break;
- case AML_POWER_RES_OP:
- data_type = ACPI_TYPE_POWER;
- break;
- case AML_PROCESSOR_OP:
- data_type = ACPI_TYPE_PROCESSOR;
- break;
- case AML_FIELD_OP: /* Field_op */
- data_type = INTERNAL_TYPE_FIELD_DEFN;
- break;
- case AML_INDEX_FIELD_OP: /* Index_field_op */
- data_type = INTERNAL_TYPE_INDEX_FIELD_DEFN;
- break;
- case AML_BANK_FIELD_OP: /* Bank_field_op */
- data_type = INTERNAL_TYPE_BANK_FIELD_DEFN;
- break;
- case AML_INT_NAMEDFIELD_OP: /* NO CASE IN ORIGINAL */
- data_type = ACPI_TYPE_ANY;
- break;
- case AML_NAME_OP: /* Name_op - special code in original */
- case AML_INT_NAMEPATH_OP:
- data_type = ACPI_TYPE_ANY;
- break;
- case AML_ALIAS_OP:
- data_type = INTERNAL_TYPE_ALIAS;
- break;
- case AML_MUTEX_OP:
- data_type = ACPI_TYPE_MUTEX;
- break;
- case AML_EVENT_OP:
- data_type = ACPI_TYPE_EVENT;
- break;
- case AML_DATA_REGION_OP:
- case AML_REGION_OP:
- data_type = ACPI_TYPE_REGION;
- break;
- default:
- data_type = ACPI_TYPE_ANY;
- break;
- }
- return (data_type);
- }