patch-2.4.6 linux/drivers/acpi/executer/exresnte.c

• Lines: 321
• Date: Wed Jun 20 17:47:40 2001
• Orig file: v2.4.5/linux/drivers/acpi/executer/exresnte.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/acpi/executer/exresnte.c linux/drivers/acpi/executer/exresnte.c
@@ -0,0 +1,320 @@
+
+/******************************************************************************
+ *
+ * Module Name: exresnte - AML Interpreter object resolution
+ *              $Revision: 37 $
+ *
+ *****************************************************************************/
+
+/*
+ *  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 "amlcode.h"
+#include "acparser.h"
+#include "acdispat.h"
+#include "acinterp.h"
+#include "acnamesp.h"
+#include "actables.h"
+#include "acevents.h"
+
+
+#define _COMPONENT          ACPI_EXECUTER
+	 MODULE_NAME         ("exresnte")
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    Acpi_ex_resolve_node_to_value
+ *
+ * PARAMETERS:  Stack_ptr       - Pointer to a location on a stack that contains
+ *                                a pointer to a Node
+ *              Walk_state      - Current state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Resolve a Namespace node (AKA a "direct name pointer") to
+ *              a valued object
+ *
+ * Note: for some of the data types, the pointer attached to the Node
+ * can be either a pointer to an actual internal object or a pointer into the
+ * AML stream itself.  These types are currently:
+ *
+ *      ACPI_TYPE_INTEGER
+ *      ACPI_TYPE_STRING
+ *      ACPI_TYPE_BUFFER
+ *      ACPI_TYPE_MUTEX
+ *      ACPI_TYPE_PACKAGE
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+acpi_ex_resolve_node_to_value (
+	ACPI_NAMESPACE_NODE     **stack_ptr,
+	ACPI_WALK_STATE         *walk_state)
+
+{
+	ACPI_STATUS             status = AE_OK;
+	ACPI_OPERAND_OBJECT     *val_desc;
+	ACPI_OPERAND_OBJECT     *obj_desc = NULL;
+	ACPI_NAMESPACE_NODE     *node;
+	u8                      *aml_pointer = NULL;
+	ACPI_OBJECT_TYPE8       entry_type;
+	ACPI_INTEGER            temp_val;
+	u8                      attached_aml_pointer = FALSE;
+	u8                      aml_opcode = 0;
+
+
+	/*
+	 * The stack pointer points to a ACPI_NAMESPACE_NODE (Node).  Get the
+	 * object that is attached to the Node.
+	 */
+
+	node      = *stack_ptr;
+	val_desc  = acpi_ns_get_attached_object (node);
+	entry_type = acpi_ns_get_type ((ACPI_HANDLE) node);
+
+	/*
+	 * The Val_desc attached to the Node can be either:
+	 * 1) An internal ACPI object
+	 * 2) A pointer into the AML stream (into one of the ACPI system tables)
+	 */
+
+	if (acpi_tb_system_table_pointer (val_desc)) {
+		/* CAN THIS EVERY HAPPEN NOW?  TBD!!! */
+
+		attached_aml_pointer = TRUE;
+		aml_opcode = *((u8 *) val_desc);
+		aml_pointer = ((u8 *) val_desc) + 1;
+
+	}
+
+
+	/*
+	 * Several Entry_types do not require further processing, so
+	 *  we will return immediately
+	 */
+	/* Devices rarely have an attached object, return the Node
+	 *  and Method locals and arguments have a pseudo-Node
+	 */
+	if (entry_type == ACPI_TYPE_DEVICE ||
+		(node->flags & (ANOBJ_METHOD_ARG | ANOBJ_METHOD_LOCAL))) {
+		return (AE_OK);
+	}
+
+	if (!val_desc) {
+		return (AE_AML_NO_OPERAND);
+	}
+
+	/*
+	 * Action is based on the type of the Node, which indicates the type
+	 * of the attached object or pointer
+	 */
+	switch (entry_type) {
+
+	case ACPI_TYPE_PACKAGE:
+
+		if (attached_aml_pointer) {
+			/*
+			 * This means that the package initialization is not parsed
+			 * -- should not happen
+			 */
+			return (AE_NOT_IMPLEMENTED);
+		}
+
+		/* Val_desc is an internal object in all cases by the time we get here */
+
+		if (ACPI_TYPE_PACKAGE != val_desc->common.type) {
+			return (AE_AML_OPERAND_TYPE);
+		}
+
+		/* Return an additional reference to the object */
+
+		obj_desc = val_desc;
+		acpi_ut_add_reference (obj_desc);
+		break;
+
+
+	case ACPI_TYPE_BUFFER:
+
+		if (attached_aml_pointer) {
+			/*
+			 * This means that the buffer initialization is not parsed
+			 * -- should not happen
+			 */
+			return (AE_NOT_IMPLEMENTED);
+		}
+
+		/* Val_desc is an internal object in all cases by the time we get here */
+
+		if (ACPI_TYPE_BUFFER != val_desc->common.type) {
+			return (AE_AML_OPERAND_TYPE);
+		}
+
+		/* Return an additional reference to the object */
+
+		obj_desc = val_desc;
+		acpi_ut_add_reference (obj_desc);
+		break;
+
+
+	case ACPI_TYPE_STRING:
+
+		if (attached_aml_pointer) {
+			/* Allocate a new string object */
+
+			obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_STRING);
+			if (!obj_desc) {
+				return (AE_NO_MEMORY);
+			}
+
+			/* Init the internal object */
+
+			obj_desc->string.pointer = (NATIVE_CHAR *) aml_pointer;
+			obj_desc->string.length = STRLEN (obj_desc->string.pointer);
+		}
+
+		else {
+			if (ACPI_TYPE_STRING != val_desc->common.type) {
+				return (AE_AML_OPERAND_TYPE);
+			}
+
+			/* Return an additional reference to the object */
+
+			obj_desc = val_desc;
+			acpi_ut_add_reference (obj_desc);
+		}
+
+		break;
+
+
+	case ACPI_TYPE_INTEGER:
+
+		/*
+		 * The Node has an attached internal object, make sure that it's a
+		 * number
+		 */
+
+		if (ACPI_TYPE_INTEGER != val_desc->common.type) {
+			return (AE_AML_OPERAND_TYPE);
+		}
+
+		/* Return an additional reference to the object */
+
+		obj_desc = val_desc;
+		acpi_ut_add_reference (obj_desc);
+		break;
+
+
+	case ACPI_TYPE_BUFFER_FIELD:
+	case INTERNAL_TYPE_REGION_FIELD:
+	case INTERNAL_TYPE_BANK_FIELD:
+	case INTERNAL_TYPE_INDEX_FIELD:
+
+		status = acpi_ex_read_data_from_field (val_desc, &obj_desc);
+		break;
+
+
+	/*
+	 * For these objects, just return the object attached to the Node
+	 */
+
+	case ACPI_TYPE_MUTEX:
+	case ACPI_TYPE_METHOD:
+	case ACPI_TYPE_POWER:
+	case ACPI_TYPE_PROCESSOR:
+	case ACPI_TYPE_THERMAL:
+	case ACPI_TYPE_EVENT:
+	case ACPI_TYPE_REGION:
+
+
+		/* Return an additional reference to the object */
+
+		obj_desc = val_desc;
+		acpi_ut_add_reference (obj_desc);
+		break;
+
+
+	/* TYPE_Any is untyped, and thus there is no object associated with it */
+
+	case ACPI_TYPE_ANY:
+
+		return (AE_AML_OPERAND_TYPE);  /* Cannot be AE_TYPE */
+		break;
+
+
+	/*
+	 * The only named references allowed are named constants
+	 *   e.g. -- Name (\OSFL, Ones)
+	 */
+	case INTERNAL_TYPE_REFERENCE:
+
+		switch (val_desc->reference.opcode) {
+
+		case AML_ZERO_OP:
+
+			temp_val = 0;
+			break;
+
+		case AML_ONE_OP:
+
+			temp_val = 1;
+			break;
+
+		case AML_ONES_OP:
+
+			temp_val = ACPI_INTEGER_MAX;
+			break;
+
+		default:
+
+			return (AE_AML_BAD_OPCODE);
+		}
+
+		/* Create object for result */
+
+		obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
+		if (!obj_desc) {
+			return (AE_NO_MEMORY);
+		}
+
+		obj_desc->integer.value = temp_val;
+
+		/* Truncate value if we are executing from a 32-bit ACPI table */
+
+		acpi_ex_truncate_for32bit_table (obj_desc, walk_state);
+		break;
+
+
+	/* Default case is for unknown types */
+
+	default:
+
+		return (AE_AML_OPERAND_TYPE);
+
+	} /* switch (Entry_type) */
+
+
+	/* Put the object descriptor on the stack */
+
+	*stack_ptr = (void *) obj_desc;
+	return (status);
+}
+
+