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c501d8112c
svn path=/branches/aicom-network-fixes/; revision=34994
603 lines
16 KiB
C
603 lines
16 KiB
C
/******************************************************************************
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*
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* Module Name: evregion - ACPI Address_space (Op_region) handler dispatch
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* $Revision: 1.1 $
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000, 2001 R. Byron Moore
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <acpi.h>
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#define _COMPONENT ACPI_EVENTS
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MODULE_NAME ("evregion")
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/**************************************************************************
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*
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* FUNCTION: Acpi_ev_install_default_address_space_handlers
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*
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* PARAMETERS:
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*
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* RETURN: Status
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*
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* DESCRIPTION: Installs the core subsystem address space handlers.
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*
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*************************************************************************/
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ACPI_STATUS
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acpi_ev_install_default_address_space_handlers (
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void)
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{
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ACPI_STATUS status;
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/*
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* All address spaces (PCI Config, EC, SMBus) are scope dependent
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* and registration must occur for a specific device. In the case
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* system memory and IO address spaces there is currently no device
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* associated with the address space. For these we use the root.
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* We install the default PCI config space handler at the root so
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* that this space is immediately available even though the we have
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* not enumerated all the PCI Root Buses yet. This is to conform
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* to the ACPI specification which states that the PCI config
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* space must be always available -- even though we are nowhere
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* near ready to find the PCI root buses at this point.
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*
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* NOTE: We ignore AE_EXIST because this means that a handler has
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* already been installed (via Acpi_install_address_space_handler)
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*/
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status = acpi_install_address_space_handler (acpi_gbl_root_node,
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ADDRESS_SPACE_SYSTEM_MEMORY,
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ACPI_DEFAULT_HANDLER, NULL, NULL);
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if ((ACPI_FAILURE (status)) &&
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(status != AE_EXIST)) {
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return (status);
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}
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status = acpi_install_address_space_handler (acpi_gbl_root_node,
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ADDRESS_SPACE_SYSTEM_IO,
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ACPI_DEFAULT_HANDLER, NULL, NULL);
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if ((ACPI_FAILURE (status)) &&
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(status != AE_EXIST)) {
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return (status);
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}
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status = acpi_install_address_space_handler (acpi_gbl_root_node,
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ADDRESS_SPACE_PCI_CONFIG,
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ACPI_DEFAULT_HANDLER, NULL, NULL);
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if ((ACPI_FAILURE (status)) &&
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(status != AE_EXIST)) {
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return (status);
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}
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return (AE_OK);
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}
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/* TBD: [Restructure] Move elsewhere */
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/**************************************************************************
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*
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* FUNCTION: Acpi_ev_execute_reg_method
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*
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* PARAMETERS: Region_obj - Object structure
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* Function - On (1) or Off (0)
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*
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* RETURN: Status
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*
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* DESCRIPTION: Execute _REG method for a region
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*
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*************************************************************************/
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static ACPI_STATUS
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acpi_ev_execute_reg_method (
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ACPI_OPERAND_OBJECT *region_obj,
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u32 function)
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{
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ACPI_OPERAND_OBJECT *params[3];
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ACPI_OPERAND_OBJECT space_id_desc;
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ACPI_OPERAND_OBJECT function_desc;
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ACPI_STATUS status;
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if (region_obj->region.extra->extra.method_REG == NULL) {
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return (AE_OK);
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}
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/*
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* _REG method has two arguments
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* Arg0: Integer: Operation region space ID
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* Same value as Region_obj->Region.Space_id
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* Arg1: Integer: connection status
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* 1 for connecting the handler,
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* 0 for disconnecting the handler
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* Passed as a parameter
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*/
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acpi_cm_init_static_object (&space_id_desc);
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acpi_cm_init_static_object (&function_desc);
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/*
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* Method requires two parameters.
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*/
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params [0] = &space_id_desc;
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params [1] = &function_desc;
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params [2] = NULL;
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/*
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* Set up the parameter objects
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*/
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space_id_desc.common.type = ACPI_TYPE_INTEGER;
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space_id_desc.integer.value = region_obj->region.space_id;
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function_desc.common.type = ACPI_TYPE_INTEGER;
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function_desc.integer.value = function;
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/*
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* Execute the method, no return value
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*/
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status = acpi_ns_evaluate_by_handle (region_obj->region.extra->extra.method_REG, params, NULL);
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return (status);
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}
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/**************************************************************************
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*
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* FUNCTION: Acpi_ev_address_space_dispatch
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*
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* PARAMETERS: Region_obj - internal region object
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* Space_id - ID of the address space (0-255)
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* Function - Read or Write operation
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* Address - Where in the space to read or write
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* Bit_width - Field width in bits (8, 16, or 32)
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* Value - Pointer to in or out value
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*
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* RETURN: Status
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*
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* DESCRIPTION: Dispatch an address space or operation region access to
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* a previously installed handler.
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*
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*************************************************************************/
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ACPI_STATUS
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acpi_ev_address_space_dispatch (
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ACPI_OPERAND_OBJECT *region_obj,
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u32 function,
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ACPI_PHYSICAL_ADDRESS address,
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u32 bit_width,
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u32 *value)
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{
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ACPI_STATUS status;
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ADDRESS_SPACE_HANDLER handler;
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ADDRESS_SPACE_SETUP region_setup;
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ACPI_OPERAND_OBJECT *handler_desc;
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void *region_context = NULL;
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/*
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* Ensure that there is a handler associated with this region
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*/
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handler_desc = region_obj->region.addr_handler;
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if (!handler_desc) {
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return(AE_NOT_EXIST);
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}
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/*
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* It may be the case that the region has never been initialized
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* Some types of regions require special init code
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*/
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if (!(region_obj->region.flags & AOPOBJ_INITIALIZED)) {
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/*
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* This region has not been initialized yet, do it
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*/
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region_setup = handler_desc->addr_handler.setup;
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if (!region_setup) {
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/*
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* Bad news, no init routine and not init'd
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*/
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return (AE_UNKNOWN_STATUS);
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}
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/*
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* We must exit the interpreter because the region setup will potentially
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* execute control methods
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*/
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acpi_aml_exit_interpreter ();
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status = region_setup (region_obj, ACPI_REGION_ACTIVATE,
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handler_desc->addr_handler.context,
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®ion_context);
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/* Re-enter the interpreter */
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acpi_aml_enter_interpreter ();
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/*
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* Init routine may fail
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*/
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if (ACPI_FAILURE (status)) {
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return(status);
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}
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region_obj->region.flags |= AOPOBJ_INITIALIZED;
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/*
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* Save the returned context for use in all accesses to
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* this particular region.
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*/
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region_obj->region.extra->extra.region_context = region_context;
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}
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/*
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* We have everything we need, begin the process
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*/
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handler = handler_desc->addr_handler.handler;
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if (!(handler_desc->addr_handler.flags & ADDR_HANDLER_DEFAULT_INSTALLED)) {
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/*
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* For handlers other than the default (supplied) handlers, we must
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* exit the interpreter because the handler *might* block -- we don't
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* know what it will do, so we can't hold the lock on the intepreter.
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*/
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acpi_aml_exit_interpreter();
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}
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/*
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* Invoke the handler.
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*/
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status = handler (function, address, bit_width, value,
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handler_desc->addr_handler.context,
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region_obj->region.extra->extra.region_context);
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if (!(handler_desc->addr_handler.flags & ADDR_HANDLER_DEFAULT_INSTALLED)) {
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/* We just returned from a non-default handler, we must re-enter the
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interpreter */
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acpi_aml_enter_interpreter ();
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}
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return (status);
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}
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/******************************************************************************
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*
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* FUNCTION: Acpi_ev_disassociate_region_from_handler
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*
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* PARAMETERS: Region_obj - Region Object
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* Acpi_ns_is_locked - Namespace Region Already Locked?
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*
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* RETURN: None
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*
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* DESCRIPTION: Break the association between the handler and the region
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* this is a two way association.
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*
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******************************************************************************/
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void
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acpi_ev_disassociate_region_from_handler(
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ACPI_OPERAND_OBJECT *region_obj,
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u8 acpi_ns_is_locked)
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{
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ACPI_OPERAND_OBJECT *handler_obj;
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ACPI_OPERAND_OBJECT *obj_desc;
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ACPI_OPERAND_OBJECT **last_obj_ptr;
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ADDRESS_SPACE_SETUP region_setup;
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void *region_context;
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ACPI_STATUS status;
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region_context = region_obj->region.extra->extra.region_context;
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/*
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* Get the address handler from the region object
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*/
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handler_obj = region_obj->region.addr_handler;
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if (!handler_obj) {
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/*
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* This region has no handler, all done
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*/
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return;
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}
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/*
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* Find this region in the handler's list
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*/
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obj_desc = handler_obj->addr_handler.region_list;
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last_obj_ptr = &handler_obj->addr_handler.region_list;
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while (obj_desc) {
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/*
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* See if this is the one
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*/
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if (obj_desc == region_obj) {
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/*
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* This is it, remove it from the handler's list
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*/
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*last_obj_ptr = obj_desc->region.next;
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obj_desc->region.next = NULL; /* Must clear field */
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if (acpi_ns_is_locked) {
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acpi_cm_release_mutex (ACPI_MTX_NAMESPACE);
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}
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/*
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* Now stop region accesses by executing the _REG method
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*/
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acpi_ev_execute_reg_method (region_obj, 0);
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if (acpi_ns_is_locked) {
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acpi_cm_acquire_mutex (ACPI_MTX_NAMESPACE);
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}
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/*
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* Call the setup handler with the deactivate notification
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*/
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region_setup = handler_obj->addr_handler.setup;
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status = region_setup (region_obj, ACPI_REGION_DEACTIVATE,
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handler_obj->addr_handler.context,
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®ion_context);
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/*
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* Init routine may fail, Just ignore errors
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*/
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region_obj->region.flags &= ~(AOPOBJ_INITIALIZED);
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/*
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* Remove handler reference in the region
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*
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* NOTE: this doesn't mean that the region goes away
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* The region is just inaccessible as indicated to
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* the _REG method
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*
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* If the region is on the handler's list
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* this better be the region's handler
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*/
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ACPI_ASSERT (region_obj->region.addr_handler == handler_obj);
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region_obj->region.addr_handler = NULL;
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return;
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} /* found the right handler */
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/*
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* Move through the linked list of handlers
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*/
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last_obj_ptr = &obj_desc->region.next;
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obj_desc = obj_desc->region.next;
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}
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/*
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* If we get here, the region was not in the handler's region list
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*/
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return;
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}
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/******************************************************************************
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*
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* FUNCTION: Acpi_ev_associate_region_and_handler
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*
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* PARAMETERS: Handler_obj - Handler Object
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* Region_obj - Region Object
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* Acpi_ns_is_locked - Namespace Region Already Locked?
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*
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* RETURN: None
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*
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* DESCRIPTION: Create the association between the handler and the region
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* this is a two way association.
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*
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******************************************************************************/
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ACPI_STATUS
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acpi_ev_associate_region_and_handler (
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ACPI_OPERAND_OBJECT *handler_obj,
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ACPI_OPERAND_OBJECT *region_obj,
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u8 acpi_ns_is_locked)
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{
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ACPI_STATUS status;
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ACPI_ASSERT (region_obj->region.space_id == handler_obj->addr_handler.space_id);
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ACPI_ASSERT (region_obj->region.addr_handler == 0);
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/*
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* Link this region to the front of the handler's list
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*/
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region_obj->region.next = handler_obj->addr_handler.region_list;
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handler_obj->addr_handler.region_list = region_obj;
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/*
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* set the region's handler
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*/
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/*
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Handler_obj->Common.Reference_count =
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(u16) (Handler_obj->Common.Reference_count +
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Region_obj->Common.Reference_count - 1);
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*/
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region_obj->region.addr_handler = handler_obj;
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/*
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* Last thing, tell all users that this region is usable
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*/
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if (acpi_ns_is_locked) {
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acpi_cm_release_mutex (ACPI_MTX_NAMESPACE);
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}
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status = acpi_ev_execute_reg_method (region_obj, 1);
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if (acpi_ns_is_locked) {
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acpi_cm_acquire_mutex (ACPI_MTX_NAMESPACE);
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}
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return (status);
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}
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/****************************************************************************
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*
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* FUNCTION: Acpi_ev_addr_handler_helper
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*
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* PARAMETERS: Handle - Node to be dumped
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* Level - Nesting level of the handle
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* Context - Passed into Acpi_ns_walk_namespace
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*
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* DESCRIPTION: This routine checks to see if the object is a Region if it
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* is then the address handler is installed in it.
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*
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* If the Object is a Device, and the device has a handler of
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* the same type then the search is terminated in that branch.
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*
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* This is because the existing handler is closer in proximity
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* to any more regions than the one we are trying to install.
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*
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***************************************************************************/
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ACPI_STATUS
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acpi_ev_addr_handler_helper (
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ACPI_HANDLE obj_handle,
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u32 level,
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void *context,
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void **return_value)
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{
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ACPI_OPERAND_OBJECT *handler_obj;
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ACPI_OPERAND_OBJECT *tmp_obj;
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ACPI_OPERAND_OBJECT *obj_desc;
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ACPI_NAMESPACE_NODE *node;
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ACPI_STATUS status;
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handler_obj = (ACPI_OPERAND_OBJECT *) context;
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/* Parameter validation */
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if (!handler_obj) {
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return (AE_OK);
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}
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/* Convert and validate the device handle */
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node = acpi_ns_convert_handle_to_entry (obj_handle);
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if (!node) {
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return (AE_BAD_PARAMETER);
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}
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/*
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* We only care about regions.and objects
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* that can have address handlers
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*/
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if ((node->type != ACPI_TYPE_DEVICE) &&
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(node->type != ACPI_TYPE_REGION) &&
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(node != acpi_gbl_root_node)) {
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return (AE_OK);
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}
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/* Check for an existing internal object */
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obj_desc = acpi_ns_get_attached_object ((ACPI_HANDLE) node);
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if (!obj_desc) {
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/*
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* The object DNE, we don't care about it
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*/
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return (AE_OK);
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}
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/*
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* Devices are handled different than regions
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*/
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if (IS_THIS_OBJECT_TYPE (obj_desc, ACPI_TYPE_DEVICE)) {
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/*
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* See if this guy has any handlers
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*/
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tmp_obj = obj_desc->device.addr_handler;
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while (tmp_obj) {
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/*
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* Now let's see if it's for the same address space.
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*/
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if (tmp_obj->addr_handler.space_id == handler_obj->addr_handler.space_id) {
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/*
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* It's for the same address space
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*/
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/*
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* Since the object we found it on was a device, then it
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* means that someone has already installed a handler for
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* the branch of the namespace from this device on. Just
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* bail out telling the walk routine to not traverse this
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* branch. This preserves the scoping rule for handlers.
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*/
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return (AE_CTRL_DEPTH);
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}
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/*
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* Move through the linked list of handlers
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*/
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tmp_obj = tmp_obj->addr_handler.next;
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}
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/*
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* As long as the device didn't have a handler for this
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* space we don't care about it. We just ignore it and
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* proceed.
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*/
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return (AE_OK);
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}
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/*
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* Only here if it was a region
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*/
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ACPI_ASSERT (obj_desc->common.type == ACPI_TYPE_REGION);
|
|
|
|
if (obj_desc->region.space_id != handler_obj->addr_handler.space_id) {
|
|
/*
|
|
* This region is for a different address space
|
|
* 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_disassociate_region_from_handler (obj_desc, FALSE);
|
|
|
|
/*
|
|
* Then connect the region to the new handler
|
|
*/
|
|
status = acpi_ev_associate_region_and_handler (handler_obj, obj_desc, FALSE);
|
|
|
|
return (status);
|
|
}
|
|
|
|
|