evrgnini.c

h内核

/******************************************************************************
 *
 * Module Name: evrgnini- ACPI address_space (op_region) init
 *
 *****************************************************************************/

/*
 * 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>

#define _COMPONENT          ACPI_EVENTS
	 ACPI_MODULE_NAME    ("evrgnini")


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_system_memory_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Do any prep work for region handling, a nop for now
 *
 ******************************************************************************/

acpi_status
acpi_ev_system_memory_region_setup (
	acpi_handle                     handle,
	u32                             function,
	void                            *handler_context,
	void                            **region_context)
{
	union acpi_operand_object       *region_desc = (union acpi_operand_object *) handle;
	struct acpi_mem_space_context   *local_region_context;


	ACPI_FUNCTION_TRACE ("ev_system_memory_region_setup");


	if (function == ACPI_REGION_DEACTIVATE) {
		if (*region_context) {
			ACPI_MEM_FREE (*region_context);
			*region_context = NULL;
		}
		return_ACPI_STATUS (AE_OK);
	}

	/* Create a new context */

	local_region_context = ACPI_MEM_CALLOCATE (sizeof (struct acpi_mem_space_context));
	if (!(local_region_context)) {
		return_ACPI_STATUS (AE_NO_MEMORY);
	}

	/* Save the region length and address for use in the handler */

	local_region_context->length = region_desc->region.length;
	local_region_context->address = region_desc->region.address;

	*region_context = local_region_context;
	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_io_space_region_setup
 *
 * PARAMETERS:  Handle              - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Do any prep work for region handling
 *
 ******************************************************************************/

acpi_status
acpi_ev_io_space_region_setup (
	acpi_handle                     handle,
	u32                             function,
	void                            *handler_context,
	void                            **region_context)
{
	ACPI_FUNCTION_TRACE ("ev_io_space_region_setup");


	if (function == ACPI_REGION_DEACTIVATE) {
		*region_context = NULL;
	}
	else {
		*region_context = handler_context;
	}

	return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_pci_config_region_setup
 *
 * PARAMETERS:  Handle             - Region we are interested in
 *              Function            - Start or stop
 *              handler_context     - Address space handler context
 *              region_context      - Region specific context
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Do any prep work for region handling
 *
 * MUTEX:       Assumes namespace is not locked
 *
 ******************************************************************************/

acpi_status
acpi_ev_pci_config_region_setup (
	acpi_handle                     handle,
	u32                             function,
	void                            *handler_context,
	void                            **region_context)
{
	acpi_status                     status = AE_OK;
	acpi_integer                    pci_value;
	struct acpi_pci_id              *pci_id = *region_context;
	union acpi_operand_object       *handler_obj;
	struct acpi_namespace_node      *parent_node;
	struct acpi_namespace_node      *pci_root_node;
	union acpi_operand_object       *region_obj = (union acpi_operand_object   *) handle;
	struct acpi_device_id           object_hID;


	ACPI_FUNCTION_TRACE ("ev_pci_config_region_setup");


	handler_obj = region_obj->region.handler;
	if (!handler_obj) {
		/*
		 * No installed handler. This shouldn't happen because the dispatch
		 * routine checks before we get here, but we check again just in case.
		 */
		ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
			"Attempting to init a region %p, with no handler\n", region_obj));
		return_ACPI_STATUS (AE_NOT_EXIST);
	}

	*region_context = NULL;
	if (function == ACPI_REGION_DEACTIVATE) {
		if (pci_id) {
			ACPI_MEM_FREE (pci_id);
		}
		return_ACPI_STATUS (status);
	}

	parent_node = acpi_ns_get_parent_node (region_obj->region.node);

	/*
	 * Get the _SEG and _BBN values from the device upon which the handler
	 * is installed.
	 *
	 * We need to get the _SEG and _BBN objects relative to the PCI BUS device.
	 * This is the device the handler has been registered to handle.
	 */

	/*
	 * If the address_space.Node is still pointing to the root, we need
	 * to scan upward for a PCI Root bridge and re-associate the op_region
	 * handlers with that device.
	 */
	if (handler_obj->address_space.node == acpi_gbl_root_node) {
		/* Start search from the parent object */

		pci_root_node = parent_node;
		while (pci_root_node != acpi_gbl_root_node) {
			status = acpi_ut_execute_HID (pci_root_node, &object_hID);
			if (ACPI_SUCCESS (status)) {
				/* Got a valid _HID, check if this is a PCI root */

				if (!(ACPI_STRNCMP (object_hID.value, PCI_ROOT_HID_STRING,
						   sizeof (PCI_ROOT_HID_STRING)))) {
					/* Install a handler for this PCI root bridge */

					status = acpi_install_address_space_handler ((acpi_handle) pci_root_node,
							   ACPI_ADR_SPACE_PCI_CONFIG,
							   ACPI_DEFAULT_HANDLER, NULL, NULL);
					if (ACPI_FAILURE (status)) {
						if (status == AE_SAME_HANDLER) {
							/*
							 * It is OK if the handler is already installed on the root
							 * bridge.  Still need to return a context object for the
							 * new PCI_Config operation region, however.
							 */
							status = AE_OK;
						}
						else {
							ACPI_REPORT_ERROR ((
								"Could not install pci_config handler for Root Bridge %4.4s, %s\n",
								acpi_ut_get_node_name (pci_root_node), acpi_format_exception (status)));
						}
					}
					break;
				}
			}

			pci_root_node = acpi_ns_get_parent_node (pci_root_node);
		}

		/* PCI root bridge not found, use namespace root node */
	}
	else {
		pci_root_node = handler_obj->address_space.node;
	}

	/*
	 * If this region is now initialized, we are done.
	 * (install_address_space_handler could have initialized it)
	 */
	if (region_obj->region.flags & AOPOBJ_SETUP_COMPLETE) {
		return_ACPI_STATUS (AE_OK);
	}

	/* Region is still not initialized. Create a new context */

	pci_id = ACPI_MEM_CALLOCATE (sizeof (struct acpi_pci_id));
	if (!pci_id) {
		return_ACPI_STATUS (AE_NO_MEMORY);
	}

	/*
	 * For PCI_Config space access, we need the segment, bus,
	 * device and function numbers.  Acquire them here.
	 */

	/*
	 * Get the PCI device and function numbers from the _ADR object
	 * contained in the parent's scope.
	 */
	status = acpi_ut_evaluate_numeric_object (METHOD_NAME__ADR, parent_node, &pci_value);

	/*
	 * The default is zero, and since the allocation above zeroed
	 * the data, just do nothing on failure.
	 */
	if (ACPI_SUCCESS (status)) {
		pci_id->device  = ACPI_HIWORD (ACPI_LODWORD (pci_value));
		pci_id->function = ACPI_LOWORD (ACPI_LODWORD (pci_value));
	}