1 /******************************************************************************
3 * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2011, Intel Corp.
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45 #define __EVXFREGN_C__
47 #include <contrib/dev/acpica/include/acpi.h>
48 #include <contrib/dev/acpica/include/accommon.h>
49 #include <contrib/dev/acpica/include/acnamesp.h>
50 #include <contrib/dev/acpica/include/acevents.h>
52 #define _COMPONENT ACPI_EVENTS
53 ACPI_MODULE_NAME ("evxfregn")
56 /*******************************************************************************
58 * FUNCTION: AcpiInstallAddressSpaceHandler
60 * PARAMETERS: Device - Handle for the device
61 * SpaceId - The address space ID
62 * Handler - Address of the handler
63 * Setup - Address of the setup function
64 * Context - Value passed to the handler on each access
68 * DESCRIPTION: Install a handler for all OpRegions of a given SpaceId.
70 * NOTE: This function should only be called after AcpiEnableSubsystem has
71 * been called. This is because any _REG methods associated with the Space ID
72 * are executed here, and these methods can only be safely executed after
73 * the default handlers have been installed and the hardware has been
74 * initialized (via AcpiEnableSubsystem.)
76 ******************************************************************************/
79 AcpiInstallAddressSpaceHandler (
81 ACPI_ADR_SPACE_TYPE SpaceId,
82 ACPI_ADR_SPACE_HANDLER Handler,
83 ACPI_ADR_SPACE_SETUP Setup,
86 ACPI_NAMESPACE_NODE *Node;
90 ACPI_FUNCTION_TRACE (AcpiInstallAddressSpaceHandler);
93 /* Parameter validation */
97 return_ACPI_STATUS (AE_BAD_PARAMETER);
100 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
101 if (ACPI_FAILURE (Status))
103 return_ACPI_STATUS (Status);
106 /* Convert and validate the device handle */
108 Node = AcpiNsValidateHandle (Device);
111 Status = AE_BAD_PARAMETER;
115 /* Install the handler for all Regions for this Space ID */
117 Status = AcpiEvInstallSpaceHandler (Node, SpaceId, Handler, Setup, Context);
118 if (ACPI_FAILURE (Status))
124 * For the default SpaceIDs, (the IDs for which there are default region handlers
125 * installed) Only execute the _REG methods if the global initialization _REG
126 * methods have already been run (via AcpiInitializeObjects). In other words,
127 * we will defer the execution of the _REG methods for these SpaceIDs until
128 * execution of AcpiInitializeObjects. This is done because we need the handlers
129 * for the default spaces (mem/io/pci/table) to be installed before we can run
130 * any control methods (or _REG methods). There is known BIOS code that depends
133 * For all other SpaceIDs, we can safely execute the _REG methods immediately.
134 * This means that for IDs like EmbeddedController, this function should be called
135 * only after AcpiEnableSubsystem has been called.
139 case ACPI_ADR_SPACE_SYSTEM_MEMORY:
140 case ACPI_ADR_SPACE_SYSTEM_IO:
141 case ACPI_ADR_SPACE_PCI_CONFIG:
142 case ACPI_ADR_SPACE_DATA_TABLE:
144 if (!AcpiGbl_RegMethodsExecuted)
146 /* We will defer execution of the _REG methods for this space */
155 /* Run all _REG methods for this address space */
157 Status = AcpiEvExecuteRegMethods (Node, SpaceId);
161 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
162 return_ACPI_STATUS (Status);
165 ACPI_EXPORT_SYMBOL (AcpiInstallAddressSpaceHandler)
168 /*******************************************************************************
170 * FUNCTION: AcpiRemoveAddressSpaceHandler
172 * PARAMETERS: Device - Handle for the device
173 * SpaceId - The address space ID
174 * Handler - Address of the handler
178 * DESCRIPTION: Remove a previously installed handler.
180 ******************************************************************************/
183 AcpiRemoveAddressSpaceHandler (
185 ACPI_ADR_SPACE_TYPE SpaceId,
186 ACPI_ADR_SPACE_HANDLER Handler)
188 ACPI_OPERAND_OBJECT *ObjDesc;
189 ACPI_OPERAND_OBJECT *HandlerObj;
190 ACPI_OPERAND_OBJECT *RegionObj;
191 ACPI_OPERAND_OBJECT **LastObjPtr;
192 ACPI_NAMESPACE_NODE *Node;
196 ACPI_FUNCTION_TRACE (AcpiRemoveAddressSpaceHandler);
199 /* Parameter validation */
203 return_ACPI_STATUS (AE_BAD_PARAMETER);
206 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
207 if (ACPI_FAILURE (Status))
209 return_ACPI_STATUS (Status);
212 /* Convert and validate the device handle */
214 Node = AcpiNsValidateHandle (Device);
216 ((Node->Type != ACPI_TYPE_DEVICE) &&
217 (Node->Type != ACPI_TYPE_PROCESSOR) &&
218 (Node->Type != ACPI_TYPE_THERMAL) &&
219 (Node != AcpiGbl_RootNode)))
221 Status = AE_BAD_PARAMETER;
225 /* Make sure the internal object exists */
227 ObjDesc = AcpiNsGetAttachedObject (Node);
230 Status = AE_NOT_EXIST;
234 /* Find the address handler the user requested */
236 HandlerObj = ObjDesc->Device.Handler;
237 LastObjPtr = &ObjDesc->Device.Handler;
240 /* We have a handler, see if user requested this one */
242 if (HandlerObj->AddressSpace.SpaceId == SpaceId)
244 /* Handler must be the same as the installed handler */
246 if (HandlerObj->AddressSpace.Handler != Handler)
248 Status = AE_BAD_PARAMETER;
252 /* Matched SpaceId, first dereference this in the Regions */
254 ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
255 "Removing address handler %p(%p) for region %s "
256 "on Device %p(%p)\n",
257 HandlerObj, Handler, AcpiUtGetRegionName (SpaceId),
260 RegionObj = HandlerObj->AddressSpace.RegionList;
262 /* Walk the handler's region list */
267 * First disassociate the handler from the region.
269 * NOTE: this doesn't mean that the region goes away
270 * The region is just inaccessible as indicated to
273 AcpiEvDetachRegion (RegionObj, TRUE);
276 * Walk the list: Just grab the head because the
277 * DetachRegion removed the previous head.
279 RegionObj = HandlerObj->AddressSpace.RegionList;
283 /* Remove this Handler object from the list */
285 *LastObjPtr = HandlerObj->AddressSpace.Next;
287 /* Now we can delete the handler object */
289 AcpiUtRemoveReference (HandlerObj);
293 /* Walk the linked list of handlers */
295 LastObjPtr = &HandlerObj->AddressSpace.Next;
296 HandlerObj = HandlerObj->AddressSpace.Next;
299 /* The handler does not exist */
301 ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
302 "Unable to remove address handler %p for %s(%X), DevNode %p, obj %p\n",
303 Handler, AcpiUtGetRegionName (SpaceId), SpaceId, Node, ObjDesc));
305 Status = AE_NOT_EXIST;
308 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
309 return_ACPI_STATUS (Status);
312 ACPI_EXPORT_SYMBOL (AcpiRemoveAddressSpaceHandler)