Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1067 insertions, 0 deletions

diff --git a/drivers/acpi/events/evregion.c b/drivers/acpi/events/evregion.c
new file mode 100644
index 000000000000..772342708a7a
--- /dev/null
+++ b/drivers/acpi/events/evregion.c
@@ -0,0 +1,1067 @@
+/******************************************************************************
+ *
+ * Module Name: evregion - ACPI address_space (op_region) handler dispatch
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, R. Byron Moore
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+
+#include <acpi/acpi.h>
+#include <acpi/acevents.h>
+#include <acpi/acnamesp.h>
+#include <acpi/acinterp.h>
+
+#define _COMPONENT          ACPI_EVENTS
+	 ACPI_MODULE_NAME    ("evregion")
+
+#define ACPI_NUM_DEFAULT_SPACES     4
+
+static u8                   acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
+			 ACPI_ADR_SPACE_SYSTEM_MEMORY,
+			 ACPI_ADR_SPACE_SYSTEM_IO,
+			 ACPI_ADR_SPACE_PCI_CONFIG,
+			 ACPI_ADR_SPACE_DATA_TABLE};
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_install_region_handlers
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Installs the core subsystem default address space handlers.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_install_region_handlers (
+	void) {
+	acpi_status                     status;
+	acpi_native_uint                i;
+
+
+	ACPI_FUNCTION_TRACE ("ev_install_region_handlers");
+
+
+	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	/*
+	 * All address spaces (PCI Config, EC, SMBus) are scope dependent
+	 * and registration must occur for a specific device.
+	 *
+	 * In the case of the system memory and IO address spaces there is currently
+	 * no device associated with the address space.  For these we use the root.
+	 *
+	 * We install the default PCI config space handler at the root so
+	 * that this space is immediately available even though the we have
+	 * not enumerated all the PCI Root Buses yet.  This is to conform
+	 * to the ACPI specification which states that the PCI config
+	 * space must be always available -- even though we are nowhere
+	 * near ready to find the PCI root buses at this point.
+	 *
+	 * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
+	 * has already been installed (via acpi_install_address_space_handler).
+	 * Similar for AE_SAME_HANDLER.
+	 */
+	for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
+		status = acpi_ev_install_space_handler (acpi_gbl_root_node,
+				  acpi_gbl_default_address_spaces[i],
+				  ACPI_DEFAULT_HANDLER, NULL, NULL);
+		switch (status) {
+		case AE_OK:
+		case AE_SAME_HANDLER:
+		case AE_ALREADY_EXISTS:
+
+			/* These exceptions are all OK */
+
+			status = AE_OK;
+			break;
+
+		default:
+
+			goto unlock_and_exit;
+		}
+	}
+
+unlock_and_exit:
+	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_initialize_op_regions
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Execute _REG methods for all Operation Regions that have
+ *              an installed default region handler.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_initialize_op_regions (
+	void)
+{
+	acpi_status                     status;
+	acpi_native_uint                i;
+
+
+	ACPI_FUNCTION_TRACE ("ev_initialize_op_regions");
+
+
+	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
+	if (ACPI_FAILURE (status)) {
+		return_ACPI_STATUS (status);
+	}
+
+	/*
+	 * Run the _REG methods for op_regions in each default address space
+	 */
+	for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
+		/* TBD: Make sure handler is the DEFAULT handler, otherwise
+		 * _REG will have already been run.
+		 */
+		status = acpi_ev_execute_reg_methods (acpi_gbl_root_node,
+				  acpi_gbl_default_address_spaces[i]);
+	}
+
+	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_execute_reg_method
+ *
+ * PARAMETERS:  region_obj          - Object structure
+ *              Function            - Passed to _REG:  On (1) or Off (0)
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Execute _REG method for a region
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_execute_reg_method (
+	union acpi_operand_object       *region_obj,
+	u32                             function)
+{
+	struct acpi_parameter_info      info;
+	union acpi_operand_object       *params[3];
+	union acpi_operand_object       *region_obj2;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_execute_reg_method");
+
+
+	region_obj2 = acpi_ns_get_secondary_object (region_obj);
+	if (!region_obj2) {
+		return_ACPI_STATUS (AE_NOT_EXIST);
+	}
+
+	if (region_obj2->extra.method_REG == NULL) {
+		return_ACPI_STATUS (AE_OK);
+	}
+
+	/*
+	 * The _REG method has two arguments:
+	 *
+	 * Arg0, Integer: Operation region space ID
+	 *          Same value as region_obj->Region.space_id
+	 * Arg1, Integer: connection status
+	 *          1 for connecting the handler,
+	 *          0 for disconnecting the handler
+	 *          Passed as a parameter
+	 */
+	params[0] = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
+	if (!params[0]) {
+		return_ACPI_STATUS (AE_NO_MEMORY);
+	}
+
+	params[1] = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER);
+	if (!params[1]) {
+		status = AE_NO_MEMORY;
+		goto cleanup;
+	}
+
+	/* Setup the parameter objects */
+
+	params[0]->integer.value = region_obj->region.space_id;
+	params[1]->integer.value = function;
+	params[2] = NULL;
+
+	info.node = region_obj2->extra.method_REG;
+	info.parameters = params;
+	info.parameter_type = ACPI_PARAM_ARGS;
+
+	/* Execute the method, no return value */
+
+	ACPI_DEBUG_EXEC (acpi_ut_display_init_pathname (
+			   ACPI_TYPE_METHOD, info.node, NULL));
+	status = acpi_ns_evaluate_by_handle (&info);
+
+	acpi_ut_remove_reference (params[1]);
+
+cleanup:
+	acpi_ut_remove_reference (params[0]);
+
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_address_space_dispatch
+ *
+ * PARAMETERS:  region_obj          - Internal region object
+ *              Function            - Read or Write operation
+ *              Address             - Where in the space to read or write
+ *              bit_width           - Field width in bits (8, 16, 32, or 64)
+ *              Value               - Pointer to in or out value
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Dispatch an address space or operation region access to
+ *              a previously installed handler.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_address_space_dispatch (
+	union acpi_operand_object       *region_obj,
+	u32                             function,
+	acpi_physical_address           address,
+	u32                             bit_width,
+	void                            *value)
+{
+	acpi_status                     status;
+	acpi_status                     status2;
+	acpi_adr_space_handler          handler;
+	acpi_adr_space_setup            region_setup;
+	union acpi_operand_object       *handler_desc;
+	union acpi_operand_object       *region_obj2;
+	void                            *region_context = NULL;
+
+
+	ACPI_FUNCTION_TRACE ("ev_address_space_dispatch");
+
+
+	region_obj2 = acpi_ns_get_secondary_object (region_obj);
+	if (!region_obj2) {
+		return_ACPI_STATUS (AE_NOT_EXIST);
+	}
+
+	/* Ensure that there is a handler associated with this region */
+
+	handler_desc = region_obj->region.handler;
+	if (!handler_desc) {
+		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+			"No handler for Region [%4.4s] (%p) [%s]\n",
+			acpi_ut_get_node_name (region_obj->region.node),
+			region_obj, acpi_ut_get_region_name (region_obj->region.space_id)));
+
+		return_ACPI_STATUS (AE_NOT_EXIST);
+	}
+
+	/*
+	 * It may be the case that the region has never been initialized
+	 * Some types of regions require special init code
+	 */
+	if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
+		/*
+		 * This region has not been initialized yet, do it
+		 */
+		region_setup = handler_desc->address_space.setup;
+		if (!region_setup) {
+			/* No initialization routine, exit with error */
+
+			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No init routine for region(%p) [%s]\n",
+				region_obj, acpi_ut_get_region_name (region_obj->region.space_id)));
+			return_ACPI_STATUS (AE_NOT_EXIST);
+		}
+
+		/*
+		 * We must exit the interpreter because the region setup will potentially
+		 * execute control methods (e.g., _REG method for this region)
+		 */
+		acpi_ex_exit_interpreter ();
+
+		status = region_setup (region_obj, ACPI_REGION_ACTIVATE,
+				  handler_desc->address_space.context, &region_context);
+
+		/* Re-enter the interpreter */
+
+		status2 = acpi_ex_enter_interpreter ();
+		if (ACPI_FAILURE (status2)) {
+			return_ACPI_STATUS (status2);
+		}
+
+		/* Check for failure of the Region Setup */
+
+		if (ACPI_FAILURE (status)) {
+			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Region Init: %s [%s]\n",
+				acpi_format_exception (status),
+				acpi_ut_get_region_name (region_obj->region.space_id)));
+			return_ACPI_STATUS (status);
+		}
+
+		/*
+		 * Region initialization may have been completed by region_setup
+		 */
+		if (!(region_obj->region.flags & AOPOBJ_SETUP_COMPLETE)) {
+			region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
+
+			if (region_obj2->extra.region_context) {
+				/* The handler for this region was already installed */
+
+				ACPI_MEM_FREE (region_context);
+			}
+			else {
+				/*
+				 * Save the returned context for use in all accesses to
+				 * this particular region
+				 */
+				region_obj2->extra.region_context = region_context;
+			}
+		}
+	}
+
+	/* We have everything we need, we can invoke the address space handler */
+
+	handler = handler_desc->address_space.handler;
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
+		"Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
+		&region_obj->region.handler->address_space, handler,
+		ACPI_FORMAT_UINT64 (address),
+		acpi_ut_get_region_name (region_obj->region.space_id)));
+
+	if (!(handler_desc->address_space.hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
+		/*
+		 * For handlers other than the default (supplied) handlers, we must
+		 * exit the interpreter because the handler *might* block -- we don't
+		 * know what it will do, so we can't hold the lock on the intepreter.
+		 */
+		acpi_ex_exit_interpreter();
+	}
+
+	/* Call the handler */
+
+	status = handler (function, address, bit_width, value,
+			 handler_desc->address_space.context,
+			 region_obj2->extra.region_context);
+
+	if (ACPI_FAILURE (status)) {
+		ACPI_REPORT_ERROR (("Handler for [%s] returned %s\n",
+			acpi_ut_get_region_name (region_obj->region.space_id),
+			acpi_format_exception (status)));
+	}
+
+	if (!(handler_desc->address_space.hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) {
+		/*
+		 * We just returned from a non-default handler, we must re-enter the
+		 * interpreter
+		 */
+		status2 = acpi_ex_enter_interpreter ();
+		if (ACPI_FAILURE (status2)) {
+			return_ACPI_STATUS (status2);
+		}
+	}
+
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_detach_region
+ *
+ * PARAMETERS:  region_obj          - Region Object
+ *              acpi_ns_is_locked   - Namespace Region Already Locked?
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Break the association between the handler and the region
+ *              this is a two way association.
+ *
+ ******************************************************************************/
+
+void
+acpi_ev_detach_region(
+	union acpi_operand_object       *region_obj,
+	u8                              acpi_ns_is_locked)
+{
+	union acpi_operand_object       *handler_obj;
+	union acpi_operand_object       *obj_desc;
+	union acpi_operand_object       **last_obj_ptr;
+	acpi_adr_space_setup            region_setup;
+	void                            **region_context;
+	union acpi_operand_object       *region_obj2;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_detach_region");
+
+
+	region_obj2 = acpi_ns_get_secondary_object (region_obj);
+	if (!region_obj2) {
+		return_VOID;
+	}
+	region_context = &region_obj2->extra.region_context;
+
+	/* Get the address handler from the region object */
+
+	handler_obj = region_obj->region.handler;
+	if (!handler_obj) {
+		/* This region has no handler, all done */
+
+		return_VOID;
+	}
+
+	/* Find this region in the handler's list */
+
+	obj_desc = handler_obj->address_space.region_list;
+	last_obj_ptr = &handler_obj->address_space.region_list;
+
+	while (obj_desc) {
+		/* Is this the correct Region? */
+
+		if (obj_desc == region_obj) {
+			ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
+				"Removing Region %p from address handler %p\n",
+				region_obj, handler_obj));
+
+			/* This is it, remove it from the handler's list */
+
+			*last_obj_ptr = obj_desc->region.next;
+			obj_desc->region.next = NULL;           /* Must clear field */
+
+			if (acpi_ns_is_locked) {
+				status = acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
+				if (ACPI_FAILURE (status)) {
+					return_VOID;
+				}
+			}
+
+			/* Now stop region accesses by executing the _REG method */
+
+			status = acpi_ev_execute_reg_method (region_obj, 0);
+			if (ACPI_FAILURE (status)) {
+				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s from region _REG, [%s]\n",
+					acpi_format_exception (status),
+					acpi_ut_get_region_name (region_obj->region.space_id)));
+			}
+
+			if (acpi_ns_is_locked) {
+				status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
+				if (ACPI_FAILURE (status)) {
+					return_VOID;
+				}
+			}
+
+			/* Call the setup handler with the deactivate notification */
+
+			region_setup = handler_obj->address_space.setup;
+			status = region_setup (region_obj, ACPI_REGION_DEACTIVATE,
+					  handler_obj->address_space.context, region_context);
+
+			/* Init routine may fail, Just ignore errors */
+
+			if (ACPI_FAILURE (status)) {
+				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s from region init, [%s]\n",
+					acpi_format_exception (status),
+					acpi_ut_get_region_name (region_obj->region.space_id)));
+			}
+
+			region_obj->region.flags &= ~(AOPOBJ_SETUP_COMPLETE);
+
+			/*
+			 * Remove handler reference in the region
+			 *
+			 * NOTE: this doesn't mean that the region goes away
+			 * The region is just inaccessible as indicated to
+			 * the _REG method
+			 *
+			 * If the region is on the handler's list
+			 * this better be the region's handler
+			 */
+			region_obj->region.handler = NULL;
+			acpi_ut_remove_reference (handler_obj);
+
+			return_VOID;
+		}
+
+		/* Walk the linked list of handlers */
+
+		last_obj_ptr = &obj_desc->region.next;
+		obj_desc = obj_desc->region.next;
+	}
+
+	/* If we get here, the region was not in the handler's region list */
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
+		"Cannot remove region %p from address handler %p\n",
+		region_obj, handler_obj));
+
+	return_VOID;
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_attach_region
+ *
+ * PARAMETERS:  handler_obj         - Handler Object
+ *              region_obj          - Region Object
+ *              acpi_ns_is_locked   - Namespace Region Already Locked?
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Create the association between the handler and the region
+ *              this is a two way association.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_attach_region (
+	union acpi_operand_object       *handler_obj,
+	union acpi_operand_object       *region_obj,
+	u8                              acpi_ns_is_locked)
+{
+
+	ACPI_FUNCTION_TRACE ("ev_attach_region");
+
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
+		"Adding Region [%4.4s] %p to address handler %p [%s]\n",
+		acpi_ut_get_node_name (region_obj->region.node),
+		region_obj, handler_obj,
+		acpi_ut_get_region_name (region_obj->region.space_id)));
+
+	/* Link this region to the front of the handler's list */
+
+	region_obj->region.next = handler_obj->address_space.region_list;
+	handler_obj->address_space.region_list = region_obj;
+
+	/* Install the region's handler */
+
+	if (region_obj->region.handler) {
+		return_ACPI_STATUS (AE_ALREADY_EXISTS);
+	}
+
+	region_obj->region.handler = handler_obj;
+	acpi_ut_add_reference (handler_obj);
+
+	return_ACPI_STATUS (AE_OK);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_install_handler
+ *
+ * PARAMETERS:  walk_namespace callback
+ *
+ * DESCRIPTION: This routine installs an address handler into objects that are
+ *              of type Region or Device.
+ *
+ *              If the Object is a Device, and the device has a handler of
+ *              the same type then the search is terminated in that branch.
+ *
+ *              This is because the existing handler is closer in proximity
+ *              to any more regions than the one we are trying to install.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_install_handler (
+	acpi_handle                     obj_handle,
+	u32                             level,
+	void                            *context,
+	void                            **return_value)
+{
+	union acpi_operand_object       *handler_obj;
+	union acpi_operand_object       *next_handler_obj;
+	union acpi_operand_object       *obj_desc;
+	struct acpi_namespace_node      *node;
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_NAME ("ev_install_handler");
+
+
+	handler_obj = (union acpi_operand_object   *) context;
+
+	/* Parameter validation */
+
+	if (!handler_obj) {
+		return (AE_OK);
+	}
+
+	/* Convert and validate the device handle */
+
+	node = acpi_ns_map_handle_to_node (obj_handle);
+	if (!node) {
+		return (AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * We only care about regions.and objects
+	 * that are allowed to have address space handlers
+	 */
+	if ((node->type != ACPI_TYPE_DEVICE) &&
+		(node->type != ACPI_TYPE_REGION) &&
+		(node != acpi_gbl_root_node)) {
+		return (AE_OK);
+	}
+
+	/* Check for an existing internal object */
+
+	obj_desc = acpi_ns_get_attached_object (node);
+	if (!obj_desc) {
+		/* No object, just exit */
+
+		return (AE_OK);
+	}
+
+	/* Devices are handled different than regions */
+
+	if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_DEVICE) {
+		/* Check if this Device already has a handler for this address space */
+
+		next_handler_obj = obj_desc->device.handler;
+		while (next_handler_obj) {
+			/* Found a handler, is it for the same address space? */
+
+			if (next_handler_obj->address_space.space_id == handler_obj->address_space.space_id) {
+				ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
+					"Found handler for region [%s] in device %p(%p) handler %p\n",
+					acpi_ut_get_region_name (handler_obj->address_space.space_id),
+					obj_desc, next_handler_obj, handler_obj));
+
+				/*
+				 * Since the object we found it on was a device, then it
+				 * means that someone has already installed a handler for
+				 * the branch of the namespace from this device on.  Just
+				 * bail out telling the walk routine to not traverse this
+				 * branch.  This preserves the scoping rule for handlers.
+				 */
+				return (AE_CTRL_DEPTH);
+			}
+
+			/* Walk the linked list of handlers attached to this device */
+
+			next_handler_obj = next_handler_obj->address_space.next;
+		}
+
+		/*
+		 * As long as the device didn't have a handler for this
+		 * space we don't care about it.  We just ignore it and
+		 * proceed.
+		 */
+		return (AE_OK);
+	}
+
+	/* Object is a Region */
+
+	if (obj_desc->region.space_id != handler_obj->address_space.space_id) {
+		/*
+		 * This region is for a different address space
+		 * -- just ignore it
+		 */
+		return (AE_OK);
+	}
+
+	/*
+	 * Now we have a region and it is for the handler's address
+	 * space type.
+	 *
+	 * First disconnect region for any previous handler (if any)
+	 */
+	acpi_ev_detach_region (obj_desc, FALSE);
+
+	/* Connect the region to the new handler */
+
+	status = acpi_ev_attach_region (handler_obj, obj_desc, FALSE);
+	return (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_install_space_handler
+ *
+ * PARAMETERS:  Node            - Namespace node for the device
+ *              space_id        - The address space ID
+ *              Handler         - Address of the handler
+ *              Setup           - Address of the setup function
+ *              Context         - Value passed to the handler on each access
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install a handler for all op_regions of a given space_id.
+ *              Assumes namespace is locked
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_install_space_handler (
+	struct acpi_namespace_node      *node,
+	acpi_adr_space_type             space_id,
+	acpi_adr_space_handler          handler,
+	acpi_adr_space_setup            setup,
+	void                            *context)
+{
+	union acpi_operand_object       *obj_desc;
+	union acpi_operand_object       *handler_obj;
+	acpi_status                     status;
+	acpi_object_type                type;
+	u16                             flags = 0;
+
+
+	ACPI_FUNCTION_TRACE ("ev_install_space_handler");
+
+
+	/*
+	 * This registration is valid for only the types below
+	 * and the root.  This is where the default handlers
+	 * get placed.
+	 */
+	if ((node->type != ACPI_TYPE_DEVICE)     &&
+		(node->type != ACPI_TYPE_PROCESSOR)  &&
+		(node->type != ACPI_TYPE_THERMAL)    &&
+		(node != acpi_gbl_root_node)) {
+		status = AE_BAD_PARAMETER;
+		goto unlock_and_exit;
+	}
+
+	if (handler == ACPI_DEFAULT_HANDLER) {
+		flags = ACPI_ADDR_HANDLER_DEFAULT_INSTALLED;
+
+		switch (space_id) {
+		case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+			handler = acpi_ex_system_memory_space_handler;
+			setup   = acpi_ev_system_memory_region_setup;
+			break;
+
+		case ACPI_ADR_SPACE_SYSTEM_IO:
+			handler = acpi_ex_system_io_space_handler;
+			setup   = acpi_ev_io_space_region_setup;
+			break;
+
+		case ACPI_ADR_SPACE_PCI_CONFIG:
+			handler = acpi_ex_pci_config_space_handler;
+			setup   = acpi_ev_pci_config_region_setup;
+			break;
+
+		case ACPI_ADR_SPACE_CMOS:
+			handler = acpi_ex_cmos_space_handler;
+			setup   = acpi_ev_cmos_region_setup;
+			break;
+
+		case ACPI_ADR_SPACE_PCI_BAR_TARGET:
+			handler = acpi_ex_pci_bar_space_handler;
+			setup   = acpi_ev_pci_bar_region_setup;
+			break;
+
+		case ACPI_ADR_SPACE_DATA_TABLE:
+			handler = acpi_ex_data_table_space_handler;
+			setup   = NULL;
+			break;
+
+		default:
+			status = AE_BAD_PARAMETER;
+			goto unlock_and_exit;
+		}
+	}
+
+	/* If the caller hasn't specified a setup routine, use the default */
+
+	if (!setup) {
+		setup = acpi_ev_default_region_setup;
+	}
+
+	/* Check for an existing internal object */
+
+	obj_desc = acpi_ns_get_attached_object (node);
+	if (obj_desc) {
+		/*
+		 * The attached device object already exists.
+		 * Make sure the handler is not already installed.
+		 */
+		handler_obj = obj_desc->device.handler;
+
+		/* Walk the handler list for this device */
+
+		while (handler_obj) {
+			/* Same space_id indicates a handler already installed */
+
+			if (handler_obj->address_space.space_id == space_id) {
+				if (handler_obj->address_space.handler == handler) {
+					/*
+					 * It is (relatively) OK to attempt to install the SAME
+					 * handler twice. This can easily happen with PCI_Config space.
+					 */
+					status = AE_SAME_HANDLER;
+					goto unlock_and_exit;
+				}
+				else {
+					/* A handler is already installed */
+
+					status = AE_ALREADY_EXISTS;
+				}
+				goto unlock_and_exit;
+			}
+
+			/* Walk the linked list of handlers */
+
+			handler_obj = handler_obj->address_space.next;
+		}
+	}
+	else {
+		ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
+			"Creating object on Device %p while installing handler\n", node));
+
+		/* obj_desc does not exist, create one */
+
+		if (node->type == ACPI_TYPE_ANY) {
+			type = ACPI_TYPE_DEVICE;
+		}
+		else {
+			type = node->type;
+		}
+
+		obj_desc = acpi_ut_create_internal_object (type);
+		if (!obj_desc) {
+			status = AE_NO_MEMORY;
+			goto unlock_and_exit;
+		}
+
+		/* Init new descriptor */
+
+		obj_desc->common.type = (u8) type;
+
+		/* Attach the new object to the Node */
+
+		status = acpi_ns_attach_object (node, obj_desc, type);
+
+		/* Remove local reference to the object */
+
+		acpi_ut_remove_reference (obj_desc);
+
+		if (ACPI_FAILURE (status)) {
+			goto unlock_and_exit;
+		}
+	}
+
+	ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
+		"Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
+		acpi_ut_get_region_name (space_id), space_id,
+		acpi_ut_get_node_name (node), node, obj_desc));
+
+	/*
+	 * Install the handler
+	 *
+	 * At this point there is no existing handler.
+	 * Just allocate the object for the handler and link it
+	 * into the list.
+	 */
+	handler_obj = acpi_ut_create_internal_object (ACPI_TYPE_LOCAL_ADDRESS_HANDLER);
+	if (!handler_obj) {
+		status = AE_NO_MEMORY;
+		goto unlock_and_exit;
+	}
+
+	/* Init handler obj */
+
+	handler_obj->address_space.space_id  = (u8) space_id;
+	handler_obj->address_space.hflags    = flags;
+	handler_obj->address_space.region_list = NULL;
+	handler_obj->address_space.node      = node;
+	handler_obj->address_space.handler   = handler;
+	handler_obj->address_space.context   = context;
+	handler_obj->address_space.setup     = setup;
+
+	/* Install at head of Device.address_space list */
+
+	handler_obj->address_space.next      = obj_desc->device.handler;
+
+	/*
+	 * The Device object is the first reference on the handler_obj.
+	 * Each region that uses the handler adds a reference.
+	 */
+	obj_desc->device.handler = handler_obj;
+
+	/*
+	 * Walk the namespace finding all of the regions this
+	 * handler will manage.
+	 *
+	 * Start at the device and search the branch toward
+	 * the leaf nodes until either the leaf is encountered or
+	 * a device is detected that has an address handler of the
+	 * same type.
+	 *
+	 * In either case, back up and search down the remainder
+	 * of the branch
+	 */
+	status = acpi_ns_walk_namespace (ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
+			  ACPI_NS_WALK_UNLOCK, acpi_ev_install_handler,
+			  handler_obj, NULL);
+
+unlock_and_exit:
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_execute_reg_methods
+ *
+ * PARAMETERS:  Node            - Namespace node for the device
+ *              space_id        - The address space ID
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Run all _REG methods for the input Space ID;
+ *              Note: assumes namespace is locked, or system init time.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_execute_reg_methods (
+	struct acpi_namespace_node      *node,
+	acpi_adr_space_type             space_id)
+{
+	acpi_status                     status;
+
+
+	ACPI_FUNCTION_TRACE ("ev_execute_reg_methods");
+
+
+	/*
+	 * Run all _REG methods for all Operation Regions for this
+	 * space ID.  This is a separate walk in order to handle any
+	 * interdependencies between regions and _REG methods.  (i.e. handlers
+	 * must be installed for all regions of this Space ID before we
+	 * can run any _REG methods)
+	 */
+	status = acpi_ns_walk_namespace (ACPI_TYPE_ANY, node, ACPI_UINT32_MAX,
+			  ACPI_NS_WALK_UNLOCK, acpi_ev_reg_run,
+			  &space_id, NULL);
+
+	return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_reg_run
+ *
+ * PARAMETERS:  walk_namespace callback
+ *
+ * DESCRIPTION: Run _REg method for region objects of the requested space_iD
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_reg_run (
+	acpi_handle                     obj_handle,
+	u32                             level,
+	void                            *context,
+	void                            **return_value)
+{
+	union acpi_operand_object       *obj_desc;
+	struct acpi_namespace_node      *node;
+	acpi_adr_space_type             space_id;
+	acpi_status                     status;
+
+
+	space_id = *ACPI_CAST_PTR (acpi_adr_space_type, context);
+
+	/* Convert and validate the device handle */
+
+	node = acpi_ns_map_handle_to_node (obj_handle);
+	if (!node) {
+		return (AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * We only care about regions.and objects
+	 * that are allowed to have address space handlers
+	 */
+	if ((node->type != ACPI_TYPE_REGION) &&
+		(node != acpi_gbl_root_node)) {
+		return (AE_OK);
+	}
+
+	/* Check for an existing internal object */
+
+	obj_desc = acpi_ns_get_attached_object (node);
+	if (!obj_desc) {
+		/* No object, just exit */
+
+		return (AE_OK);
+	}
+
+	/* Object is a Region */
+
+	if (obj_desc->region.space_id != space_id) {
+		/*
+		 * This region is for a different address space
+		 * -- just ignore it
+		 */
+		return (AE_OK);
+	}
+
+	status = acpi_ev_execute_reg_method (obj_desc, 1);
+	return (status);
+}
+