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/******************************************************************************
*
* Module Name: evregion - ACPI Address_space (Op_region) handler dispatch
* $Revision: 113 $
*
*****************************************************************************/
/*
* Copyright (C) 2000, 2001 R. Byron Moore
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "acpi.h"
#include "acevents.h"
#include "acnamesp.h"
#include "acinterp.h"
#include "amlcode.h"
#define _COMPONENT ACPI_EVENTS
MODULE_NAME ("evregion")
/*******************************************************************************
*
* FUNCTION: Acpi_ev_install_default_address_space_handlers
*
* PARAMETERS:
*
* RETURN: Status
*
* DESCRIPTION: Installs the core subsystem address space handlers.
*
******************************************************************************/
acpi_status
acpi_ev_install_default_address_space_handlers (
void)
{
acpi_status status;
FUNCTION_TRACE ("Ev_install_default_address_space_handlers");
/*
* All address spaces (PCI Config, EC, SMBus) are scope dependent
* and registration must occur for a specific device. In the case
* 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_EXIST because this means that a handler has
* already been installed (via Acpi_install_address_space_handler)
*/
status = acpi_install_address_space_handler (acpi_gbl_root_node,
ACPI_ADR_SPACE_SYSTEM_MEMORY,
ACPI_DEFAULT_HANDLER, NULL, NULL);
if ((ACPI_FAILURE (status)) &&
(status != AE_EXIST)) {
return_ACPI_STATUS (status);
}
status = acpi_install_address_space_handler (acpi_gbl_root_node,
ACPI_ADR_SPACE_SYSTEM_IO,
ACPI_DEFAULT_HANDLER, NULL, NULL);
if ((ACPI_FAILURE (status)) &&
(status != AE_EXIST)) {
return_ACPI_STATUS (status);
}
status = acpi_install_address_space_handler (acpi_gbl_root_node,
ACPI_ADR_SPACE_PCI_CONFIG,
ACPI_DEFAULT_HANDLER, NULL, NULL);
if ((ACPI_FAILURE (status)) &&
(status != AE_EXIST)) {
return_ACPI_STATUS (status);
}
return_ACPI_STATUS (AE_OK);
}
/* TBD: [Restructure] Move elsewhere */
/*******************************************************************************
*
* FUNCTION: Acpi_ev_execute_reg_method
*
* PARAMETERS: Region_obj - Object structure
* Function - On (1) or Off (0)
*
* RETURN: Status
*
* DESCRIPTION: Execute _REG method for a region
*
******************************************************************************/
static acpi_status
acpi_ev_execute_reg_method (
acpi_operand_object *region_obj,
u32 function)
{
acpi_operand_object *params[3];
acpi_status status;
FUNCTION_TRACE ("Ev_execute_reg_method");
if (region_obj->region.extra->extra.method_REG == NULL) {
return_ACPI_STATUS (AE_OK);
}
/*
* _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;
}
/*
* Set up the parameter objects
*/
params[0]->integer.value = region_obj->region.space_id;
params[1]->integer.value = function;
params[2] = NULL;
/*
* Execute the method, no return value
*/
DEBUG_EXEC(acpi_ut_display_init_pathname (region_obj->region.extra->extra.method_REG, " [Method]"));
status = acpi_ns_evaluate_by_handle (region_obj->region.extra->extra.method_REG, params, NULL);
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
* Space_id - ID of the address space (0-255)
* Function - Read or Write operation
* Address - Where in the space to read or write
* Bit_width - Field width in bits (8, 16, or 32)
* 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 (
acpi_operand_object *region_obj,
u32 function,
ACPI_PHYSICAL_ADDRESS address,
u32 bit_width,
u32 *value)
{
acpi_status status;
acpi_adr_space_handler handler;
acpi_adr_space_setup region_setup;
acpi_operand_object *handler_desc;
void *region_context = NULL;
FUNCTION_TRACE ("Ev_address_space_dispatch");
/*
* Ensure that there is a handler associated with this region
*/
handler_desc = region_obj->region.addr_handler;
if (!handler_desc) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "no handler for region(%p) [%s]\n",
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_INITIALIZED)) {
/*
* This region has not been initialized yet, do it
*/
region_setup = handler_desc->addr_handler.setup;
if (!region_setup) {
/*
* Bad news, no init routine and not init'd
*/
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_UNKNOWN_STATUS);
}
/*
* We must exit the interpreter because the region setup will potentially
* execute control methods
*/
acpi_ex_exit_interpreter ();
status = region_setup (region_obj, ACPI_REGION_ACTIVATE,
handler_desc->addr_handler.context, ®ion_context);
/* Re-enter the interpreter */
acpi_ex_enter_interpreter ();
/*
* Init routine may fail
*/
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_obj->region.flags |= AOPOBJ_INITIALIZED;
/*
* Save the returned context for use in all accesses to
* this particular region.
*/
region_obj->region.extra->extra.region_context = region_context;
}
/*
* We have everything we need, begin the process
*/
handler = handler_desc->addr_handler.handler;
ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
"Addrhandler %p (%p), Address %8.8X%8.8X\n",
®ion_obj->region.addr_handler->addr_handler, handler, HIDWORD(address),
LODWORD(address)));
if (!(handler_desc->addr_handler.flags & 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();
}
/*
* Invoke the handler.
*/
status = handler (function, address, bit_width, value,
handler_desc->addr_handler.context,
region_obj->region.extra->extra.region_context);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Region handler: %s [%s]\n",
acpi_format_exception (status),
acpi_ut_get_region_name (region_obj->region.space_id)));
}
if (!(handler_desc->addr_handler.flags & ADDR_HANDLER_DEFAULT_INSTALLED)) {
/*
* We just returned from a non-default handler, we must re-enter the
* interpreter
*/
acpi_ex_enter_interpreter ();
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ev_disassociate_region_from_handler
*
* 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_disassociate_region_from_handler(
acpi_operand_object *region_obj,
u8 acpi_ns_is_locked)
{
acpi_operand_object *handler_obj;
acpi_operand_object *obj_desc;
acpi_operand_object **last_obj_ptr;
acpi_adr_space_setup region_setup;
void *region_context;
acpi_status status;
FUNCTION_TRACE ("Ev_disassociate_region_from_handler");
region_context = region_obj->region.extra->extra.region_context;
/*
* Get the address handler from the region object
*/
handler_obj = region_obj->region.addr_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->addr_handler.region_list;
last_obj_ptr = &handler_obj->addr_handler.region_list;
while (obj_desc) {
/*
* See if this is the one
*/
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) {
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
}
/*
* Now stop region accesses by executing the _REG method
*/
acpi_ev_execute_reg_method (region_obj, 0);
if (acpi_ns_is_locked) {
acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
}
/*
* Call the setup handler with the deactivate notification
*/
region_setup = handler_obj->addr_handler.setup;
status = region_setup (region_obj, ACPI_REGION_DEACTIVATE,
handler_obj->addr_handler.context, ®ion_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_INITIALIZED);
/*
* 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.addr_handler = NULL;
return_VOID;
} /* found the right handler */
/*
* Move through 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_associate_region_and_handler
*
* 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_associate_region_and_handler (
acpi_operand_object *handler_obj,
acpi_operand_object *region_obj,
u8 acpi_ns_is_locked)
{
acpi_status status;
FUNCTION_TRACE ("Ev_associate_region_and_handler");
ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
"Adding Region %p to address handler %p [%s]\n",
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->addr_handler.region_list;
handler_obj->addr_handler.region_list = region_obj;
/*
* set the region's handler
*/
region_obj->region.addr_handler = handler_obj;
/*
* Last thing, tell all users that this region is usable
*/
if (acpi_ns_is_locked) {
acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
}
status = acpi_ev_execute_reg_method (region_obj, 1);
if (acpi_ns_is_locked) {
acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_ev_addr_handler_helper
*
* PARAMETERS: Handle - Node to be dumped
* Level - Nesting level of the handle
* Context - Passed into Acpi_ns_walk_namespace
*
* DESCRIPTION: This routine checks to see if the object is a Region if it
* is then the address handler is installed in it.
*
* 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_addr_handler_helper (
acpi_handle obj_handle,
u32 level,
void *context,
void **return_value)
{
acpi_operand_object *handler_obj;
acpi_operand_object *tmp_obj;
acpi_operand_object *obj_desc;
acpi_namespace_node *node;
acpi_status status;
PROC_NAME ("Ev_addr_handler_helper");
handler_obj = (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 can have address 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) {
/*
* The object DNE, we don't care about it
*/
return (AE_OK);
}
/*
* Devices are handled different than regions
*/
if (IS_THIS_OBJECT_TYPE (obj_desc, ACPI_TYPE_DEVICE)) {
/*
* See if this guy has any handlers
*/
tmp_obj = obj_desc->device.addr_handler;
while (tmp_obj) {
/*
* Now let's see if it's for the same address space.
*/
if (tmp_obj->addr_handler.space_id == handler_obj->addr_handler.space_id) {
/*
* It's for the same address space
*/
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->addr_handler.space_id),
obj_desc, tmp_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);
}
/*
* Move through the linked list of handlers
*/
tmp_obj = tmp_obj->addr_handler.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);
}
/*
* Only here if it was a 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);
}
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