utcopy.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

/******************************************************************************
 *
 * Module Name: utcopy - Internal to external object translation utilities
 *              $Revision: 83 $
 *
 *****************************************************************************/

/*
 *  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 "acinterp.h"
#include "acnamesp.h"
#include "amlcode.h"


#define _COMPONENT          ACPI_UTILITIES
	 MODULE_NAME         ("utcopy")


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_copy_isimple_to_esimple
 *
 * PARAMETERS:  *Internal_object    - Pointer to the object we are examining
 *              *Buffer             - Where the object is returned
 *              *Space_used         - Where the data length is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to place a simple object in a user
 *              buffer.
 *
 *              The buffer is assumed to have sufficient space for the object.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_isimple_to_esimple (
	acpi_operand_object     *internal_object,
	acpi_object             *external_object,
	u8                      *data_space,
	u32                     *buffer_space_used)
{
	u32                     length = 0;
	acpi_status             status = AE_OK;


	FUNCTION_TRACE ("Ut_copy_isimple_to_esimple");


	/*
	 * Check for NULL object case (could be an uninitialized
	 * package element
	 */
	if (!internal_object) {
		*buffer_space_used = 0;
		return_ACPI_STATUS (AE_OK);
	}

	/* Always clear the external object */

	MEMSET (external_object, 0, sizeof (acpi_object));

	/*
	 * In general, the external object will be the same type as
	 * the internal object
	 */
	external_object->type = internal_object->common.type;

	/* However, only a limited number of external types are supported */

	switch (internal_object->common.type) {

	case ACPI_TYPE_STRING:

		length = internal_object->string.length + 1;
		external_object->string.length = internal_object->string.length;
		external_object->string.pointer = (NATIVE_CHAR *) data_space;
		MEMCPY ((void *) data_space, (void *) internal_object->string.pointer, length);
		break;


	case ACPI_TYPE_BUFFER:

		length = internal_object->buffer.length;
		external_object->buffer.length = internal_object->buffer.length;
		external_object->buffer.pointer = data_space;
		MEMCPY ((void *) data_space, (void *) internal_object->buffer.pointer, length);
		break;


	case ACPI_TYPE_INTEGER:

		external_object->integer.value= internal_object->integer.value;
		break;


	case INTERNAL_TYPE_REFERENCE:

		/*
		 * This is an object reference.  Attempt to dereference it.
		 */
		switch (internal_object->reference.opcode) {
		case AML_ZERO_OP:
			external_object->type = ACPI_TYPE_INTEGER;
			external_object->integer.value = 0;
			break;

		case AML_ONE_OP:
			external_object->type = ACPI_TYPE_INTEGER;
			external_object->integer.value = 1;
			break;

		case AML_ONES_OP:
			external_object->type = ACPI_TYPE_INTEGER;
			external_object->integer.value = ACPI_INTEGER_MAX;
			break;

		case AML_REVISION_OP:
			external_object->type = ACPI_TYPE_INTEGER;
			external_object->integer.value = ACPI_CA_SUPPORT_LEVEL;
			break;

		case AML_INT_NAMEPATH_OP:
			/*
			 * This is a named reference, get the string.  We already know that
			 * we have room for it, use max length
			 */
			length = MAX_STRING_LENGTH;
			external_object->type = ACPI_TYPE_STRING;
			external_object->string.pointer = (NATIVE_CHAR *) data_space;
			status = acpi_ns_handle_to_pathname ((acpi_handle *) internal_object->reference.node,
					 &length, (char *) data_space);

			/* Converted (external) string length is returned from above */

			external_object->string.length = length;
			break;

		default:
			/*
			 * Use the object type of "Any" to indicate a reference
			 * to object containing a handle to an ACPI named object.
			 */
			external_object->type = ACPI_TYPE_ANY;
			external_object->reference.handle = internal_object->reference.node;
			break;
		}
		break;


	case ACPI_TYPE_PROCESSOR:

		external_object->processor.proc_id = internal_object->processor.proc_id;
		external_object->processor.pblk_address = internal_object->processor.address;
		external_object->processor.pblk_length = internal_object->processor.length;
		break;


	case ACPI_TYPE_POWER:

		external_object->power_resource.system_level =
				   internal_object->power_resource.system_level;

		external_object->power_resource.resource_order =
				   internal_object->power_resource.resource_order;
		break;


	default:
		/*
		 * There is no corresponding external object type
		 */
		return_ACPI_STATUS (AE_SUPPORT);
		break;
	}


	*buffer_space_used = (u32) ROUND_UP_TO_NATIVE_WORD (length);

	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_copy_ielement_to_eelement
 *
 * PARAMETERS:  ACPI_PKG_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Copy one package element to another package element
 *
 ******************************************************************************/

acpi_status
acpi_ut_copy_ielement_to_eelement (
	u8                      object_type,
	acpi_operand_object     *source_object,
	acpi_generic_state      *state,
	void                    *context)
{
	acpi_status             status = AE_OK;
	acpi_pkg_info           *info = (acpi_pkg_info *) context;
	u32                     object_space;
	u32                     this_index;
	acpi_object             *target_object;


	FUNCTION_ENTRY ();


	this_index   = state->pkg.index;
	target_object = (acpi_object *)
			  &((acpi_object *)(state->pkg.dest_object))->package.elements[this_index];

	switch (object_type) {
	case ACPI_COPY_TYPE_SIMPLE:

		/*
		 * This is a simple or null object -- get the size
		 */
		status = acpi_ut_copy_isimple_to_esimple (source_object,
				  target_object, info->free_space, &object_space);
		if (ACPI_FAILURE (status)) {
			return (status);
		}

		break;

	case ACPI_COPY_TYPE_PACKAGE:

		/*
		 * Build the package object
		 */
		target_object->type             = ACPI_TYPE_PACKAGE;
		target_object->package.count    = source_object->package.count;
		target_object->package.elements = (acpi_object *) info->free_space;

		/*
		 * Pass the new package object back to the package walk routine
		 */
		state->pkg.this_target_obj = target_object;

		/*
		 * Save space for the array of objects (Package elements)
		 * update the buffer length counter
		 */
		object_space = (u32) ROUND_UP_TO_NATIVE_WORD (
				   target_object->package.count * sizeof (acpi_object));
		break;

	default:
		return (AE_BAD_PARAMETER);
	}


	info->free_space  += object_space;
	info->length      += object_space;

	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_copy_ipackage_to_epackage
 *
 * PARAMETERS:  *Internal_object    - Pointer to the object we are returning
 *              *Buffer             - Where the object is returned
 *              *Space_used         - Where the object length is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to place a package object in a user
 *              buffer.  A package object by definition contains other objects.
 *
 *              The buffer is assumed to have sufficient space for the object.
 *              The caller must have verified the buffer length needed using the
 *              Acpi_ut_get_object_size function before calling this function.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_copy_ipackage_to_epackage (
	acpi_operand_object     *internal_object,
	u8                      *buffer,
	u32                     *space_used)
{
	acpi_object             *external_object;
	acpi_status             status;
	acpi_pkg_info           info;


	FUNCTION_TRACE ("Ut_copy_ipackage_to_epackage");


	/*
	 * First package at head of the buffer
	 */
	external_object = (acpi_object *) buffer;

	/*
	 * Free space begins right after the first package
	 */
	info.length      = 0;
	info.object_space = 0;
	info.num_packages = 1;
	info.free_space  = buffer + ROUND_UP_TO_NATIVE_WORD (sizeof (acpi_object));


	external_object->type              = internal_object->common.type;
	external_object->package.count     = internal_object->package.count;
	external_object->package.elements  = (acpi_object *) info.free_space;


	/*
	 * Build an array of ACPI_OBJECTS in the buffer
	 * and move the free space past it
	 */
	info.free_space += external_object->package.count *
			  ROUND_UP_TO_NATIVE_WORD (sizeof (acpi_object));


	status = acpi_ut_walk_package_tree (internal_object, external_object,
			 acpi_ut_copy_ielement_to_eelement, &info);

	*space_used = info.length;

	return_ACPI_STATUS (status);

}

/*******************************************************************************
 *
 * FUNCTION:    Acpi_ut_copy_iobject_to_eobject
 *
 * PARAMETERS:  *Internal_object    - The internal object to be converted
 *              *Buffer_ptr         - Where the object is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to build an API object to be returned to
 *              the caller.
 *
 ******************************************************************************/

acpi_status
acpi_ut_copy_iobject_to_eobject (
	acpi_operand_object     *internal_object,
	acpi_buffer             *ret_buffer)
{
	acpi_status             status;


	FUNCTION_TRACE ("Ut_copy_iobject_to_eobject");


	if (IS_THIS_OBJECT_TYPE (internal_object, ACPI_TYPE_PACKAGE)) {
		/*
		 * Package object:  Copy all subobjects (including
		 * nested packages)
		 */
		status = acpi_ut_copy_ipackage_to_epackage (internal_object,
				  ret_buffer->pointer, &ret_buffer->length);