rsxface.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 529 行 · 第 1/2 页

	buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
	status = acpi_rs_get_method_data(device_handle, name, &buffer);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Buffer now contains the resource list */

	resource = ACPI_CAST_PTR(struct acpi_resource, buffer.pointer);
	resource_end =
	    ACPI_ADD_PTR(struct acpi_resource, buffer.pointer, buffer.length);

	/* Walk the resource list until the end_tag is found (or buffer end) */

	while (resource < resource_end) {
		/* Sanity check the resource */

		if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
			status = AE_AML_INVALID_RESOURCE_TYPE;
			break;
		}

		/* Invoke the user function, abort on any error returned */

		status = user_function(resource, context);
		if (ACPI_FAILURE(status)) {
			if (status == AE_CTRL_TERMINATE) {
				/* This is an OK termination by the user function */

				status = AE_OK;
			}
			break;
		}

		/* end_tag indicates end-of-list */

		if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
			break;
		}

		/* Get the next resource descriptor */

		resource =
		    ACPI_ADD_PTR(struct acpi_resource, resource,
				 resource->length);
	}

	ACPI_MEM_FREE(buffer.pointer);
	return_ACPI_STATUS(status);
}

EXPORT_SYMBOL(acpi_walk_resources);

/*******************************************************************************
 *
 * FUNCTION:    acpi_set_current_resources
 *
 * PARAMETERS:  device_handle   - a handle to the device object for the
 *                                device we are changing the resources of
 *              in_buffer       - a pointer to a buffer containing the
 *                                resources to be set for the device
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to set the current resources for a
 *              specific device.  The caller must first acquire a handle for
 *              the desired device.  The resource data is passed to the routine
 *              the buffer pointed to by the in_buffer variable.
 *
 ******************************************************************************/

acpi_status
acpi_set_current_resources(acpi_handle device_handle,
			   struct acpi_buffer *in_buffer)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE("acpi_set_current_resources");

	/* Must have a valid handle and buffer */

	if ((!device_handle) ||
	    (!in_buffer) || (!in_buffer->pointer) || (!in_buffer->length)) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	status = acpi_rs_set_srs_method_data(device_handle, in_buffer);
	return_ACPI_STATUS(status);
}

EXPORT_SYMBOL(acpi_set_current_resources);

/******************************************************************************
 *
 * FUNCTION:    acpi_resource_to_address64
 *
 * PARAMETERS:  Resource                - Pointer to a resource
 *              Out                     - Pointer to the users's return
 *                                        buffer (a struct
 *                                        struct acpi_resource_address64)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: If the resource is an address16, address32, or address64,
 *              copy it to the address64 return buffer.  This saves the
 *              caller from having to duplicate code for different-sized
 *              addresses.
 *
 ******************************************************************************/

acpi_status
acpi_resource_to_address64(struct acpi_resource *resource,
			   struct acpi_resource_address64 *out)
{
	struct acpi_resource_address16 *address16;
	struct acpi_resource_address32 *address32;

	if (!resource || !out) {
		return (AE_BAD_PARAMETER);
	}

	/* Convert 16 or 32 address descriptor to 64 */

	switch (resource->type) {
	case ACPI_RESOURCE_TYPE_ADDRESS16:

		address16 = (struct acpi_resource_address16 *)&resource->data;
		ACPI_COPY_ADDRESS(out, address16);
		break;

	case ACPI_RESOURCE_TYPE_ADDRESS32:

		address32 = (struct acpi_resource_address32 *)&resource->data;
		ACPI_COPY_ADDRESS(out, address32);
		break;

	case ACPI_RESOURCE_TYPE_ADDRESS64:

		/* Simple copy for 64 bit source */

		ACPI_MEMCPY(out, &resource->data,
			    sizeof(struct acpi_resource_address64));
		break;

	default:
		return (AE_BAD_PARAMETER);
	}

	return (AE_OK);
}

EXPORT_SYMBOL(acpi_resource_to_address64);

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_vendor_resource
 *
 * PARAMETERS:  device_handle       - Handle for the parent device object
 *              Name                - Method name for the parent resource
 *                                    (METHOD_NAME__CRS or METHOD_NAME__PRS)
 *              Uuid                - Pointer to the UUID to be matched.
 *                                    includes both subtype and 16-byte UUID
 *              ret_buffer          - Where the vendor resource is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk a resource template for the specified evice to find a
 *              vendor-defined resource that matches the supplied UUID and
 *              UUID subtype. Returns a struct acpi_resource of type Vendor.
 *
 ******************************************************************************/

acpi_status
acpi_get_vendor_resource(acpi_handle device_handle,
			 char *name,
			 struct acpi_vendor_uuid * uuid,
			 struct acpi_buffer * ret_buffer)
{
	struct acpi_vendor_walk_info info;
	acpi_status status;

	/* Other parameters are validated by acpi_walk_resources */

	if (!uuid || !ret_buffer) {
		return (AE_BAD_PARAMETER);
	}

	info.uuid = uuid;
	info.buffer = ret_buffer;
	info.status = AE_NOT_EXIST;

	/* Walk the _CRS or _PRS resource list for this device */

	status =
	    acpi_walk_resources(device_handle, name,
				acpi_rs_match_vendor_resource, &info);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	return (info.status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_rs_match_vendor_resource
 *
 * PARAMETERS:  ACPI_WALK_RESOURCE_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Match a vendor resource via the ACPI 3.0 UUID
 *
 ******************************************************************************/

static acpi_status
acpi_rs_match_vendor_resource(struct acpi_resource *resource, void *context)
{
	struct acpi_vendor_walk_info *info = context;
	struct acpi_resource_vendor_typed *vendor;
	struct acpi_buffer *buffer;
	acpi_status status;

	/* Ignore all descriptors except Vendor */

	if (resource->type != ACPI_RESOURCE_TYPE_VENDOR) {
		return (AE_OK);
	}

	vendor = &resource->data.vendor_typed;

	/*
	 * For a valid match, these conditions must hold:
	 *
	 * 1) Length of descriptor data must be at least as long as a UUID struct
	 * 2) The UUID subtypes must match
	 * 3) The UUID data must match
	 */
	if ((vendor->byte_length < (ACPI_UUID_LENGTH + 1)) ||
	    (vendor->uuid_subtype != info->uuid->subtype) ||
	    (ACPI_MEMCMP(vendor->uuid, info->uuid->data, ACPI_UUID_LENGTH))) {
		return (AE_OK);
	}

	/* Validate/Allocate/Clear caller buffer */

	buffer = info->buffer;
	status = acpi_ut_initialize_buffer(buffer, resource->length);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	/* Found the correct resource, copy and return it */

	ACPI_MEMCPY(buffer->pointer, resource, resource->length);
	buffer->length = resource->length;

	/* Found the desired descriptor, terminate resource walk */

	info->status = AE_OK;
	return (AE_CTRL_TERMINATE);
}