1 /******************************************************************************
3 * Module Name: evregion - ACPI address_space (op_region) handler dispatch
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2006, R. Byron Moore
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions, and the following disclaimer,
16 * without modification.
17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18 * substantially similar to the "NO WARRANTY" disclaimer below
19 * ("Disclaimer") and any redistribution must be conditioned upon
20 * including a substantially similar Disclaimer requirement for further
21 * binary redistribution.
22 * 3. Neither the names of the above-listed copyright holders nor the names
23 * of any contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * Alternatively, this software may be distributed under the terms of the
27 * GNU General Public License ("GPL") version 2 as published by the Free
28 * Software Foundation.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41 * POSSIBILITY OF SUCH DAMAGES.
44 #include <acpi/acpi.h>
45 #include <acpi/acevents.h>
46 #include <acpi/acnamesp.h>
47 #include <acpi/acinterp.h>
49 #define _COMPONENT ACPI_EVENTS
50 ACPI_MODULE_NAME("evregion")
51 #define ACPI_NUM_DEFAULT_SPACES 4
52 static u8 acpi_gbl_default_address_spaces
[ACPI_NUM_DEFAULT_SPACES
] = {
53 ACPI_ADR_SPACE_SYSTEM_MEMORY
,
54 ACPI_ADR_SPACE_SYSTEM_IO
,
55 ACPI_ADR_SPACE_PCI_CONFIG
,
56 ACPI_ADR_SPACE_DATA_TABLE
59 /* Local prototypes */
62 acpi_ev_reg_run(acpi_handle obj_handle
,
63 u32 level
, void *context
, void **return_value
);
66 acpi_ev_install_handler(acpi_handle obj_handle
,
67 u32 level
, void *context
, void **return_value
);
69 /*******************************************************************************
71 * FUNCTION: acpi_ev_install_region_handlers
77 * DESCRIPTION: Installs the core subsystem default address space handlers.
79 ******************************************************************************/
81 acpi_status
acpi_ev_install_region_handlers(void)
86 ACPI_FUNCTION_TRACE(ev_install_region_handlers
);
88 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
89 if (ACPI_FAILURE(status
)) {
90 return_ACPI_STATUS(status
);
94 * All address spaces (PCI Config, EC, SMBus) are scope dependent
95 * and registration must occur for a specific device.
97 * In the case of the system memory and IO address spaces there is currently
98 * no device associated with the address space. For these we use the root.
100 * We install the default PCI config space handler at the root so
101 * that this space is immediately available even though the we have
102 * not enumerated all the PCI Root Buses yet. This is to conform
103 * to the ACPI specification which states that the PCI config
104 * space must be always available -- even though we are nowhere
105 * near ready to find the PCI root buses at this point.
107 * NOTE: We ignore AE_ALREADY_EXISTS because this means that a handler
108 * has already been installed (via acpi_install_address_space_handler).
109 * Similar for AE_SAME_HANDLER.
111 for (i
= 0; i
< ACPI_NUM_DEFAULT_SPACES
; i
++) {
112 status
= acpi_ev_install_space_handler(acpi_gbl_root_node
,
113 acpi_gbl_default_address_spaces
115 ACPI_DEFAULT_HANDLER
,
119 case AE_SAME_HANDLER
:
120 case AE_ALREADY_EXISTS
:
122 /* These exceptions are all OK */
129 goto unlock_and_exit
;
134 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
135 return_ACPI_STATUS(status
);
138 /*******************************************************************************
140 * FUNCTION: acpi_ev_initialize_op_regions
146 * DESCRIPTION: Execute _REG methods for all Operation Regions that have
147 * an installed default region handler.
149 ******************************************************************************/
151 acpi_status
acpi_ev_initialize_op_regions(void)
156 ACPI_FUNCTION_TRACE(ev_initialize_op_regions
);
158 status
= acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
159 if (ACPI_FAILURE(status
)) {
160 return_ACPI_STATUS(status
);
164 * Run the _REG methods for op_regions in each default address space
166 for (i
= 0; i
< ACPI_NUM_DEFAULT_SPACES
; i
++) {
168 /* TBD: Make sure handler is the DEFAULT handler, otherwise
169 * _REG will have already been run.
171 status
= acpi_ev_execute_reg_methods(acpi_gbl_root_node
,
172 acpi_gbl_default_address_spaces
176 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
177 return_ACPI_STATUS(status
);
180 /*******************************************************************************
182 * FUNCTION: acpi_ev_execute_reg_method
184 * PARAMETERS: region_obj - Region object
185 * Function - Passed to _REG: On (1) or Off (0)
189 * DESCRIPTION: Execute _REG method for a region
191 ******************************************************************************/
194 acpi_ev_execute_reg_method(union acpi_operand_object
*region_obj
, u32 function
)
196 struct acpi_parameter_info info
;
197 union acpi_operand_object
*params
[3];
198 union acpi_operand_object
*region_obj2
;
201 ACPI_FUNCTION_TRACE(ev_execute_reg_method
);
203 region_obj2
= acpi_ns_get_secondary_object(region_obj
);
205 return_ACPI_STATUS(AE_NOT_EXIST
);
208 if (region_obj2
->extra
.method_REG
== NULL
) {
209 return_ACPI_STATUS(AE_OK
);
213 * The _REG method has two arguments:
215 * Arg0, Integer: Operation region space ID
216 * Same value as region_obj->Region.space_id
217 * Arg1, Integer: connection status
218 * 1 for connecting the handler,
219 * 0 for disconnecting the handler
220 * Passed as a parameter
222 params
[0] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER
);
224 return_ACPI_STATUS(AE_NO_MEMORY
);
227 params
[1] = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER
);
229 status
= AE_NO_MEMORY
;
233 /* Setup the parameter objects */
235 params
[0]->integer
.value
= region_obj
->region
.space_id
;
236 params
[1]->integer
.value
= function
;
239 info
.node
= region_obj2
->extra
.method_REG
;
240 info
.parameters
= params
;
241 info
.parameter_type
= ACPI_PARAM_ARGS
;
243 /* Execute the method, no return value */
245 ACPI_DEBUG_EXEC(acpi_ut_display_init_pathname
246 (ACPI_TYPE_METHOD
, info
.node
, NULL
));
247 status
= acpi_ns_evaluate_by_handle(&info
);
249 acpi_ut_remove_reference(params
[1]);
252 acpi_ut_remove_reference(params
[0]);
253 return_ACPI_STATUS(status
);
256 /*******************************************************************************
258 * FUNCTION: acpi_ev_address_space_dispatch
260 * PARAMETERS: region_obj - Internal region object
261 * Function - Read or Write operation
262 * Address - Where in the space to read or write
263 * bit_width - Field width in bits (8, 16, 32, or 64)
264 * Value - Pointer to in or out value
268 * DESCRIPTION: Dispatch an address space or operation region access to
269 * a previously installed handler.
271 ******************************************************************************/
274 acpi_ev_address_space_dispatch(union acpi_operand_object
*region_obj
,
276 acpi_physical_address address
,
277 u32 bit_width
, void *value
)
281 acpi_adr_space_handler handler
;
282 acpi_adr_space_setup region_setup
;
283 union acpi_operand_object
*handler_desc
;
284 union acpi_operand_object
*region_obj2
;
285 void *region_context
= NULL
;
287 ACPI_FUNCTION_TRACE(ev_address_space_dispatch
);
289 region_obj2
= acpi_ns_get_secondary_object(region_obj
);
291 return_ACPI_STATUS(AE_NOT_EXIST
);
294 /* Ensure that there is a handler associated with this region */
296 handler_desc
= region_obj
->region
.handler
;
299 "No handler for Region [%4.4s] (%p) [%s]",
300 acpi_ut_get_node_name(region_obj
->region
.node
),
302 acpi_ut_get_region_name(region_obj
->region
.
305 return_ACPI_STATUS(AE_NOT_EXIST
);
309 * It may be the case that the region has never been initialized
310 * Some types of regions require special init code
312 if (!(region_obj
->region
.flags
& AOPOBJ_SETUP_COMPLETE
)) {
314 * This region has not been initialized yet, do it
316 region_setup
= handler_desc
->address_space
.setup
;
319 /* No initialization routine, exit with error */
322 "No init routine for region(%p) [%s]",
324 acpi_ut_get_region_name(region_obj
->region
.
326 return_ACPI_STATUS(AE_NOT_EXIST
);
330 * We must exit the interpreter because the region
331 * setup will potentially execute control methods
332 * (e.g., _REG method for this region)
334 acpi_ex_exit_interpreter();
336 status
= region_setup(region_obj
, ACPI_REGION_ACTIVATE
,
337 handler_desc
->address_space
.context
,
340 /* Re-enter the interpreter */
342 status2
= acpi_ex_enter_interpreter();
343 if (ACPI_FAILURE(status2
)) {
344 return_ACPI_STATUS(status2
);
347 /* Check for failure of the Region Setup */
349 if (ACPI_FAILURE(status
)) {
350 ACPI_EXCEPTION((AE_INFO
, status
,
351 "During region initialization: [%s]",
352 acpi_ut_get_region_name(region_obj
->
355 return_ACPI_STATUS(status
);
359 * Region initialization may have been completed by region_setup
361 if (!(region_obj
->region
.flags
& AOPOBJ_SETUP_COMPLETE
)) {
362 region_obj
->region
.flags
|= AOPOBJ_SETUP_COMPLETE
;
364 if (region_obj2
->extra
.region_context
) {
366 /* The handler for this region was already installed */
368 ACPI_FREE(region_context
);
371 * Save the returned context for use in all accesses to
372 * this particular region
374 region_obj2
->extra
.region_context
=
380 /* We have everything we need, we can invoke the address space handler */
382 handler
= handler_desc
->address_space
.handler
;
384 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
385 "Handler %p (@%p) Address %8.8X%8.8X [%s]\n",
386 ®ion_obj
->region
.handler
->address_space
, handler
,
387 ACPI_FORMAT_UINT64(address
),
388 acpi_ut_get_region_name(region_obj
->region
.
391 if (!(handler_desc
->address_space
.handler_flags
&
392 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED
)) {
394 * For handlers other than the default (supplied) handlers, we must
395 * exit the interpreter because the handler *might* block -- we don't
396 * know what it will do, so we can't hold the lock on the intepreter.
398 acpi_ex_exit_interpreter();
401 /* Call the handler */
403 status
= handler(function
, address
, bit_width
, value
,
404 handler_desc
->address_space
.context
,
405 region_obj2
->extra
.region_context
);
407 if (ACPI_FAILURE(status
)) {
408 ACPI_EXCEPTION((AE_INFO
, status
, "Returned by Handler for [%s]",
409 acpi_ut_get_region_name(region_obj
->region
.
413 if (!(handler_desc
->address_space
.handler_flags
&
414 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED
)) {
416 * We just returned from a non-default handler, we must re-enter the
419 status2
= acpi_ex_enter_interpreter();
420 if (ACPI_FAILURE(status2
)) {
421 return_ACPI_STATUS(status2
);
425 return_ACPI_STATUS(status
);
428 /*******************************************************************************
430 * FUNCTION: acpi_ev_detach_region
432 * PARAMETERS: region_obj - Region Object
433 * acpi_ns_is_locked - Namespace Region Already Locked?
437 * DESCRIPTION: Break the association between the handler and the region
438 * this is a two way association.
440 ******************************************************************************/
443 acpi_ev_detach_region(union acpi_operand_object
*region_obj
,
444 u8 acpi_ns_is_locked
)
446 union acpi_operand_object
*handler_obj
;
447 union acpi_operand_object
*obj_desc
;
448 union acpi_operand_object
**last_obj_ptr
;
449 acpi_adr_space_setup region_setup
;
450 void **region_context
;
451 union acpi_operand_object
*region_obj2
;
454 ACPI_FUNCTION_TRACE(ev_detach_region
);
456 region_obj2
= acpi_ns_get_secondary_object(region_obj
);
460 region_context
= ®ion_obj2
->extra
.region_context
;
462 /* Get the address handler from the region object */
464 handler_obj
= region_obj
->region
.handler
;
467 /* This region has no handler, all done */
472 /* Find this region in the handler's list */
474 obj_desc
= handler_obj
->address_space
.region_list
;
475 last_obj_ptr
= &handler_obj
->address_space
.region_list
;
479 /* Is this the correct Region? */
481 if (obj_desc
== region_obj
) {
482 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
483 "Removing Region %p from address handler %p\n",
484 region_obj
, handler_obj
));
486 /* This is it, remove it from the handler's list */
488 *last_obj_ptr
= obj_desc
->region
.next
;
489 obj_desc
->region
.next
= NULL
; /* Must clear field */
491 if (acpi_ns_is_locked
) {
493 acpi_ut_release_mutex(ACPI_MTX_NAMESPACE
);
494 if (ACPI_FAILURE(status
)) {
499 /* Now stop region accesses by executing the _REG method */
501 status
= acpi_ev_execute_reg_method(region_obj
, 0);
502 if (ACPI_FAILURE(status
)) {
503 ACPI_EXCEPTION((AE_INFO
, status
,
504 "from region _REG, [%s]",
505 acpi_ut_get_region_name
506 (region_obj
->region
.space_id
)));
509 if (acpi_ns_is_locked
) {
511 acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE
);
512 if (ACPI_FAILURE(status
)) {
517 /* Call the setup handler with the deactivate notification */
519 region_setup
= handler_obj
->address_space
.setup
;
521 region_setup(region_obj
, ACPI_REGION_DEACTIVATE
,
522 handler_obj
->address_space
.context
,
525 /* Init routine may fail, Just ignore errors */
527 if (ACPI_FAILURE(status
)) {
528 ACPI_EXCEPTION((AE_INFO
, status
,
529 "from region init, [%s]",
530 acpi_ut_get_region_name
531 (region_obj
->region
.space_id
)));
534 region_obj
->region
.flags
&= ~(AOPOBJ_SETUP_COMPLETE
);
537 * Remove handler reference in the region
539 * NOTE: this doesn't mean that the region goes away
540 * The region is just inaccessible as indicated to
543 * If the region is on the handler's list
544 * this better be the region's handler
546 region_obj
->region
.handler
= NULL
;
547 acpi_ut_remove_reference(handler_obj
);
552 /* Walk the linked list of handlers */
554 last_obj_ptr
= &obj_desc
->region
.next
;
555 obj_desc
= obj_desc
->region
.next
;
558 /* If we get here, the region was not in the handler's region list */
560 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
561 "Cannot remove region %p from address handler %p\n",
562 region_obj
, handler_obj
));
567 /*******************************************************************************
569 * FUNCTION: acpi_ev_attach_region
571 * PARAMETERS: handler_obj - Handler Object
572 * region_obj - Region Object
573 * acpi_ns_is_locked - Namespace Region Already Locked?
577 * DESCRIPTION: Create the association between the handler and the region
578 * this is a two way association.
580 ******************************************************************************/
583 acpi_ev_attach_region(union acpi_operand_object
*handler_obj
,
584 union acpi_operand_object
*region_obj
,
585 u8 acpi_ns_is_locked
)
588 ACPI_FUNCTION_TRACE(ev_attach_region
);
590 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
591 "Adding Region [%4.4s] %p to address handler %p [%s]\n",
592 acpi_ut_get_node_name(region_obj
->region
.node
),
593 region_obj
, handler_obj
,
594 acpi_ut_get_region_name(region_obj
->region
.
597 /* Link this region to the front of the handler's list */
599 region_obj
->region
.next
= handler_obj
->address_space
.region_list
;
600 handler_obj
->address_space
.region_list
= region_obj
;
602 /* Install the region's handler */
604 if (region_obj
->region
.handler
) {
605 return_ACPI_STATUS(AE_ALREADY_EXISTS
);
608 region_obj
->region
.handler
= handler_obj
;
609 acpi_ut_add_reference(handler_obj
);
611 return_ACPI_STATUS(AE_OK
);
614 /*******************************************************************************
616 * FUNCTION: acpi_ev_install_handler
618 * PARAMETERS: walk_namespace callback
620 * DESCRIPTION: This routine installs an address handler into objects that are
621 * of type Region or Device.
623 * If the Object is a Device, and the device has a handler of
624 * the same type then the search is terminated in that branch.
626 * This is because the existing handler is closer in proximity
627 * to any more regions than the one we are trying to install.
629 ******************************************************************************/
632 acpi_ev_install_handler(acpi_handle obj_handle
,
633 u32 level
, void *context
, void **return_value
)
635 union acpi_operand_object
*handler_obj
;
636 union acpi_operand_object
*next_handler_obj
;
637 union acpi_operand_object
*obj_desc
;
638 struct acpi_namespace_node
*node
;
641 ACPI_FUNCTION_NAME(ev_install_handler
);
643 handler_obj
= (union acpi_operand_object
*)context
;
645 /* Parameter validation */
651 /* Convert and validate the device handle */
653 node
= acpi_ns_map_handle_to_node(obj_handle
);
655 return (AE_BAD_PARAMETER
);
659 * We only care about regions.and objects
660 * that are allowed to have address space handlers
662 if ((node
->type
!= ACPI_TYPE_DEVICE
) &&
663 (node
->type
!= ACPI_TYPE_REGION
) && (node
!= acpi_gbl_root_node
)) {
667 /* Check for an existing internal object */
669 obj_desc
= acpi_ns_get_attached_object(node
);
672 /* No object, just exit */
677 /* Devices are handled different than regions */
679 if (ACPI_GET_OBJECT_TYPE(obj_desc
) == ACPI_TYPE_DEVICE
) {
681 /* Check if this Device already has a handler for this address space */
683 next_handler_obj
= obj_desc
->device
.handler
;
684 while (next_handler_obj
) {
686 /* Found a handler, is it for the same address space? */
688 if (next_handler_obj
->address_space
.space_id
==
689 handler_obj
->address_space
.space_id
) {
690 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
691 "Found handler for region [%s] in device %p(%p) handler %p\n",
692 acpi_ut_get_region_name
693 (handler_obj
->address_space
.
699 * Since the object we found it on was a device, then it
700 * means that someone has already installed a handler for
701 * the branch of the namespace from this device on. Just
702 * bail out telling the walk routine to not traverse this
703 * branch. This preserves the scoping rule for handlers.
705 return (AE_CTRL_DEPTH
);
708 /* Walk the linked list of handlers attached to this device */
710 next_handler_obj
= next_handler_obj
->address_space
.next
;
714 * As long as the device didn't have a handler for this
715 * space we don't care about it. We just ignore it and
721 /* Object is a Region */
723 if (obj_desc
->region
.space_id
!= handler_obj
->address_space
.space_id
) {
725 * This region is for a different address space
732 * Now we have a region and it is for the handler's address
735 * First disconnect region for any previous handler (if any)
737 acpi_ev_detach_region(obj_desc
, FALSE
);
739 /* Connect the region to the new handler */
741 status
= acpi_ev_attach_region(handler_obj
, obj_desc
, FALSE
);
745 /*******************************************************************************
747 * FUNCTION: acpi_ev_install_space_handler
749 * PARAMETERS: Node - Namespace node for the device
750 * space_id - The address space ID
751 * Handler - Address of the handler
752 * Setup - Address of the setup function
753 * Context - Value passed to the handler on each access
757 * DESCRIPTION: Install a handler for all op_regions of a given space_id.
758 * Assumes namespace is locked
760 ******************************************************************************/
763 acpi_ev_install_space_handler(struct acpi_namespace_node
* node
,
764 acpi_adr_space_type space_id
,
765 acpi_adr_space_handler handler
,
766 acpi_adr_space_setup setup
, void *context
)
768 union acpi_operand_object
*obj_desc
;
769 union acpi_operand_object
*handler_obj
;
771 acpi_object_type type
;
774 ACPI_FUNCTION_TRACE(ev_install_space_handler
);
777 * This registration is valid for only the types below
778 * and the root. This is where the default handlers
781 if ((node
->type
!= ACPI_TYPE_DEVICE
) &&
782 (node
->type
!= ACPI_TYPE_PROCESSOR
) &&
783 (node
->type
!= ACPI_TYPE_THERMAL
) && (node
!= acpi_gbl_root_node
)) {
784 status
= AE_BAD_PARAMETER
;
785 goto unlock_and_exit
;
788 if (handler
== ACPI_DEFAULT_HANDLER
) {
789 flags
= ACPI_ADDR_HANDLER_DEFAULT_INSTALLED
;
792 case ACPI_ADR_SPACE_SYSTEM_MEMORY
:
793 handler
= acpi_ex_system_memory_space_handler
;
794 setup
= acpi_ev_system_memory_region_setup
;
797 case ACPI_ADR_SPACE_SYSTEM_IO
:
798 handler
= acpi_ex_system_io_space_handler
;
799 setup
= acpi_ev_io_space_region_setup
;
802 case ACPI_ADR_SPACE_PCI_CONFIG
:
803 handler
= acpi_ex_pci_config_space_handler
;
804 setup
= acpi_ev_pci_config_region_setup
;
807 case ACPI_ADR_SPACE_CMOS
:
808 handler
= acpi_ex_cmos_space_handler
;
809 setup
= acpi_ev_cmos_region_setup
;
812 case ACPI_ADR_SPACE_PCI_BAR_TARGET
:
813 handler
= acpi_ex_pci_bar_space_handler
;
814 setup
= acpi_ev_pci_bar_region_setup
;
817 case ACPI_ADR_SPACE_DATA_TABLE
:
818 handler
= acpi_ex_data_table_space_handler
;
823 status
= AE_BAD_PARAMETER
;
824 goto unlock_and_exit
;
828 /* If the caller hasn't specified a setup routine, use the default */
831 setup
= acpi_ev_default_region_setup
;
834 /* Check for an existing internal object */
836 obj_desc
= acpi_ns_get_attached_object(node
);
839 * The attached device object already exists.
840 * Make sure the handler is not already installed.
842 handler_obj
= obj_desc
->device
.handler
;
844 /* Walk the handler list for this device */
846 while (handler_obj
) {
848 /* Same space_id indicates a handler already installed */
850 if (handler_obj
->address_space
.space_id
== space_id
) {
851 if (handler_obj
->address_space
.handler
==
854 * It is (relatively) OK to attempt to install the SAME
855 * handler twice. This can easily happen
856 * with PCI_Config space.
858 status
= AE_SAME_HANDLER
;
859 goto unlock_and_exit
;
861 /* A handler is already installed */
863 status
= AE_ALREADY_EXISTS
;
865 goto unlock_and_exit
;
868 /* Walk the linked list of handlers */
870 handler_obj
= handler_obj
->address_space
.next
;
873 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
874 "Creating object on Device %p while installing handler\n",
877 /* obj_desc does not exist, create one */
879 if (node
->type
== ACPI_TYPE_ANY
) {
880 type
= ACPI_TYPE_DEVICE
;
885 obj_desc
= acpi_ut_create_internal_object(type
);
887 status
= AE_NO_MEMORY
;
888 goto unlock_and_exit
;
891 /* Init new descriptor */
893 obj_desc
->common
.type
= (u8
) type
;
895 /* Attach the new object to the Node */
897 status
= acpi_ns_attach_object(node
, obj_desc
, type
);
899 /* Remove local reference to the object */
901 acpi_ut_remove_reference(obj_desc
);
903 if (ACPI_FAILURE(status
)) {
904 goto unlock_and_exit
;
908 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION
,
909 "Installing address handler for region %s(%X) on Device %4.4s %p(%p)\n",
910 acpi_ut_get_region_name(space_id
), space_id
,
911 acpi_ut_get_node_name(node
), node
, obj_desc
));
914 * Install the handler
916 * At this point there is no existing handler.
917 * Just allocate the object for the handler and link it
921 acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_ADDRESS_HANDLER
);
923 status
= AE_NO_MEMORY
;
924 goto unlock_and_exit
;
927 /* Init handler obj */
929 handler_obj
->address_space
.space_id
= (u8
) space_id
;
930 handler_obj
->address_space
.handler_flags
= flags
;
931 handler_obj
->address_space
.region_list
= NULL
;
932 handler_obj
->address_space
.node
= node
;
933 handler_obj
->address_space
.handler
= handler
;
934 handler_obj
->address_space
.context
= context
;
935 handler_obj
->address_space
.setup
= setup
;
937 /* Install at head of Device.address_space list */
939 handler_obj
->address_space
.next
= obj_desc
->device
.handler
;
942 * The Device object is the first reference on the handler_obj.
943 * Each region that uses the handler adds a reference.
945 obj_desc
->device
.handler
= handler_obj
;
948 * Walk the namespace finding all of the regions this
949 * handler will manage.
951 * Start at the device and search the branch toward
952 * the leaf nodes until either the leaf is encountered or
953 * a device is detected that has an address handler of the
956 * In either case, back up and search down the remainder
959 status
= acpi_ns_walk_namespace(ACPI_TYPE_ANY
, node
, ACPI_UINT32_MAX
,
961 acpi_ev_install_handler
, handler_obj
,
965 return_ACPI_STATUS(status
);
968 /*******************************************************************************
970 * FUNCTION: acpi_ev_execute_reg_methods
972 * PARAMETERS: Node - Namespace node for the device
973 * space_id - The address space ID
977 * DESCRIPTION: Run all _REG methods for the input Space ID;
978 * Note: assumes namespace is locked, or system init time.
980 ******************************************************************************/
983 acpi_ev_execute_reg_methods(struct acpi_namespace_node
*node
,
984 acpi_adr_space_type space_id
)
988 ACPI_FUNCTION_TRACE(ev_execute_reg_methods
);
991 * Run all _REG methods for all Operation Regions for this
992 * space ID. This is a separate walk in order to handle any
993 * interdependencies between regions and _REG methods. (i.e. handlers
994 * must be installed for all regions of this Space ID before we
995 * can run any _REG methods)
997 status
= acpi_ns_walk_namespace(ACPI_TYPE_ANY
, node
, ACPI_UINT32_MAX
,
998 ACPI_NS_WALK_UNLOCK
, acpi_ev_reg_run
,
1001 return_ACPI_STATUS(status
);
1004 /*******************************************************************************
1006 * FUNCTION: acpi_ev_reg_run
1008 * PARAMETERS: walk_namespace callback
1010 * DESCRIPTION: Run _REg method for region objects of the requested space_iD
1012 ******************************************************************************/
1015 acpi_ev_reg_run(acpi_handle obj_handle
,
1016 u32 level
, void *context
, void **return_value
)
1018 union acpi_operand_object
*obj_desc
;
1019 struct acpi_namespace_node
*node
;
1020 acpi_adr_space_type space_id
;
1023 space_id
= *ACPI_CAST_PTR(acpi_adr_space_type
, context
);
1025 /* Convert and validate the device handle */
1027 node
= acpi_ns_map_handle_to_node(obj_handle
);
1029 return (AE_BAD_PARAMETER
);
1033 * We only care about regions.and objects
1034 * that are allowed to have address space handlers
1036 if ((node
->type
!= ACPI_TYPE_REGION
) && (node
!= acpi_gbl_root_node
)) {
1040 /* Check for an existing internal object */
1042 obj_desc
= acpi_ns_get_attached_object(node
);
1045 /* No object, just exit */
1050 /* Object is a Region */
1052 if (obj_desc
->region
.space_id
!= space_id
) {
1054 * This region is for a different address space
1060 status
= acpi_ev_execute_reg_method(obj_desc
, 1);