示例#1
0
acpi_status
acpi_hw_validate_register(struct acpi_generic_address *reg,
			  u8 max_bit_width, u64 *address)
{
	u8 bit_width;
	u8 access_width;

	/* Must have a valid pointer to a GAS structure */

	if (!reg) {
		return (AE_BAD_PARAMETER);
	}

	/*
	 * Copy the target address. This handles possible alignment issues.
	 * Address must not be null. A null address also indicates an optional
	 * ACPI register that is not supported, so no error message.
	 */
	ACPI_MOVE_64_TO_64(address, &reg->address);
	if (!(*address)) {
		return (AE_BAD_ADDRESS);
	}

	/* Validate the space_ID */

	if ((reg->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) &&
	    (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO)) {
		ACPI_ERROR((AE_INFO,
			    "Unsupported address space: 0x%X", reg->space_id));
		return (AE_SUPPORT);
	}

	/* Validate the access_width */

	if (reg->access_width > 4) {
		ACPI_ERROR((AE_INFO,
			    "Unsupported register access width: 0x%X",
			    reg->access_width));
		return (AE_SUPPORT);
	}

	/* Validate the bit_width, convert access_width into number of bits */

	access_width =
	    acpi_hw_get_access_bit_width(*address, reg, max_bit_width);
	bit_width =
	    ACPI_ROUND_UP(reg->bit_offset + reg->bit_width, access_width);
	if (max_bit_width < bit_width) {
		ACPI_WARNING((AE_INFO,
			      "Requested bit width 0x%X is smaller than register bit width 0x%X",
			      max_bit_width, bit_width));
		return (AE_SUPPORT);
	}

	return (AE_OK);
}
示例#2
0
static void
XfCheckFieldRange (
    ACPI_PARSE_OBJECT       *Op,
    UINT32                  RegionBitLength,
    UINT32                  FieldBitOffset,
    UINT32                  FieldBitLength,
    UINT32                  AccessBitWidth)
{
    UINT32                  FieldEndBitOffset;


    /*
     * Check each field unit against the region size. The entire
     * field unit (start offset plus length) must fit within the
     * region.
     */
    FieldEndBitOffset = FieldBitOffset + FieldBitLength;

    if (FieldEndBitOffset > RegionBitLength)
    {
        /* Field definition itself is beyond the end-of-region */

        AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_OFFSET, Op, NULL);
        return;
    }

    /*
     * Now check that the field plus AccessWidth doesn't go beyond
     * the end-of-region. Assumes AccessBitWidth is a power of 2
     */
    FieldEndBitOffset = ACPI_ROUND_UP (FieldEndBitOffset, AccessBitWidth);

    if (FieldEndBitOffset > RegionBitLength)
    {
        /* Field definition combined with the access is beyond EOR */

        AslError (ASL_ERROR, ASL_MSG_FIELD_UNIT_ACCESS_WIDTH, Op, NULL);
    }
}
示例#3
0
static u32
acpi_ex_generate_access(u32 field_bit_offset,
			u32 field_bit_length, u32 region_length)
{
	u32 field_byte_length;
	u32 field_byte_offset;
	u32 field_byte_end_offset;
	u32 access_byte_width;
	u32 field_start_offset;
	u32 field_end_offset;
	u32 minimum_access_width = 0xFFFFFFFF;
	u32 minimum_accesses = 0xFFFFFFFF;
	u32 accesses;

	ACPI_FUNCTION_TRACE(ex_generate_access);

	/* Round Field start offset and length to "minimal" byte boundaries */

	field_byte_offset = ACPI_DIV_8(ACPI_ROUND_DOWN(field_bit_offset, 8));
	field_byte_end_offset = ACPI_DIV_8(ACPI_ROUND_UP(field_bit_length +
							 field_bit_offset, 8));
	field_byte_length = field_byte_end_offset - field_byte_offset;

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "Bit length %u, Bit offset %u\n",
			  field_bit_length, field_bit_offset));

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "Byte Length %u, Byte Offset %u, End Offset %u\n",
			  field_byte_length, field_byte_offset,
			  field_byte_end_offset));

	/*
	 * Iterative search for the maximum access width that is both aligned
	 * and does not go beyond the end of the region
	 *
	 * Start at byte_acc and work upwards to qword_acc max. (1,2,4,8 bytes)
	 */
	for (access_byte_width = 1; access_byte_width <= 8;
	     access_byte_width <<= 1) {
		/*
		 * 1) Round end offset up to next access boundary and make sure that
		 *    this does not go beyond the end of the parent region.
		 * 2) When the Access width is greater than the field_byte_length, we
		 *    are done. (This does not optimize for the perfectly aligned
		 *    case yet).
		 */
		if (ACPI_ROUND_UP(field_byte_end_offset, access_byte_width) <=
		    region_length) {
			field_start_offset =
			    ACPI_ROUND_DOWN(field_byte_offset,
					    access_byte_width) /
			    access_byte_width;

			field_end_offset =
			    ACPI_ROUND_UP((field_byte_length +
					   field_byte_offset),
					  access_byte_width) /
			    access_byte_width;

			accesses = field_end_offset - field_start_offset;

			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
					  "AccessWidth %u end is within region\n",
					  access_byte_width));

			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
					  "Field Start %u, Field End %u -- requires %u accesses\n",
					  field_start_offset, field_end_offset,
					  accesses));

			/* Single access is optimal */

			if (accesses <= 1) {
				ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
						  "Entire field can be accessed with one operation of size %u\n",
						  access_byte_width));
				return_VALUE(access_byte_width);
			}

			/*
			 * Fits in the region, but requires more than one read/write.
			 * try the next wider access on next iteration
			 */
			if (accesses < minimum_accesses) {
				minimum_accesses = accesses;
				minimum_access_width = access_byte_width;
			}
		} else {
			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
					  "AccessWidth %u end is NOT within region\n",
					  access_byte_width));
			if (access_byte_width == 1) {
				ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
						  "Field goes beyond end-of-region!\n"));

				/* Field does not fit in the region at all */

				return_VALUE(0);
			}

			/*
			 * This width goes beyond the end-of-region, back off to
			 * previous access
			 */
			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
					  "Backing off to previous optimal access width of %u\n",
					  minimum_access_width));
			return_VALUE(minimum_access_width);
		}
	}

	/*
	 * Could not read/write field with one operation,
	 * just use max access width
	 */
	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "Cannot access field in one operation, using width 8\n"));
	return_VALUE(8);
}
示例#4
0
static ACPI_STATUS
AcpiExSetupRegion (
    ACPI_OPERAND_OBJECT     *ObjDesc,
    UINT32                  FieldDatumByteOffset)
{
    ACPI_STATUS             Status = AE_OK;
    ACPI_OPERAND_OBJECT     *RgnDesc;
    UINT8                   SpaceId;


    ACPI_FUNCTION_TRACE_U32 (ExSetupRegion, FieldDatumByteOffset);


    RgnDesc = ObjDesc->CommonField.RegionObj;

    /* We must have a valid region */

    if (RgnDesc->Common.Type != ACPI_TYPE_REGION)
    {
        ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)",
            RgnDesc->Common.Type,
            AcpiUtGetObjectTypeName (RgnDesc)));

        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
    }

    SpaceId = RgnDesc->Region.SpaceId;

    /* Validate the Space ID */

    if (!AcpiIsValidSpaceId (SpaceId))
    {
        ACPI_ERROR ((AE_INFO, "Invalid/unknown Address Space ID: 0x%2.2X", SpaceId));
        return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID);
    }

    /*
     * If the Region Address and Length have not been previously evaluated,
     * evaluate them now and save the results.
     */
    if (!(RgnDesc->Common.Flags & AOPOBJ_DATA_VALID))
    {
        Status = AcpiDsGetRegionArguments (RgnDesc);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }

    /*
     * Exit now for SMBus, GSBus or IPMI address space, it has a non-linear
     * address space and the request cannot be directly validated
     */
    if (SpaceId == ACPI_ADR_SPACE_SMBUS ||
        SpaceId == ACPI_ADR_SPACE_GSBUS ||
        SpaceId == ACPI_ADR_SPACE_IPMI)
    {
        /* SMBus or IPMI has a non-linear address space */

        return_ACPI_STATUS (AE_OK);
    }

#ifdef ACPI_UNDER_DEVELOPMENT
    /*
     * If the Field access is AnyAcc, we can now compute the optimal
     * access (because we know know the length of the parent region)
     */
    if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
    {
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }
#endif

    /*
     * Validate the request. The entire request from the byte offset for a
     * length of one field datum (access width) must fit within the region.
     * (Region length is specified in bytes)
     */
    if (RgnDesc->Region.Length <
            (ObjDesc->CommonField.BaseByteOffset + FieldDatumByteOffset +
            ObjDesc->CommonField.AccessByteWidth))
    {
        if (AcpiGbl_EnableInterpreterSlack)
        {
            /*
             * Slack mode only:  We will go ahead and allow access to this
             * field if it is within the region length rounded up to the next
             * access width boundary. ACPI_SIZE cast for 64-bit compile.
             */
            if (ACPI_ROUND_UP (RgnDesc->Region.Length,
                    ObjDesc->CommonField.AccessByteWidth) >=
                ((ACPI_SIZE) ObjDesc->CommonField.BaseByteOffset +
                    ObjDesc->CommonField.AccessByteWidth +
                    FieldDatumByteOffset))
            {
                return_ACPI_STATUS (AE_OK);
            }
        }

        if (RgnDesc->Region.Length < ObjDesc->CommonField.AccessByteWidth)
        {
            /*
             * This is the case where the AccessType (AccWord, etc.) is wider
             * than the region itself. For example, a region of length one
             * byte, and a field with Dword access specified.
             */
            ACPI_ERROR ((AE_INFO,
                "Field [%4.4s] access width (%u bytes) too large for region [%4.4s] (length %u)",
                AcpiUtGetNodeName (ObjDesc->CommonField.Node),
                ObjDesc->CommonField.AccessByteWidth,
                AcpiUtGetNodeName (RgnDesc->Region.Node),
                RgnDesc->Region.Length));
        }

        /*
         * Offset rounded up to next multiple of field width
         * exceeds region length, indicate an error
         */
        ACPI_ERROR ((AE_INFO,
            "Field [%4.4s] Base+Offset+Width %u+%u+%u is beyond end of region [%4.4s] (length %u)",
            AcpiUtGetNodeName (ObjDesc->CommonField.Node),
            ObjDesc->CommonField.BaseByteOffset,
            FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth,
            AcpiUtGetNodeName (RgnDesc->Region.Node),
            RgnDesc->Region.Length));

        return_ACPI_STATUS (AE_AML_REGION_LIMIT);
    }

    return_ACPI_STATUS (AE_OK);
}
示例#5
0
static u32
acpi_ex_generate_access(u32 field_bit_offset,
			u32 field_bit_length, u32 region_length)
{
	u32 field_byte_length;
	u32 field_byte_offset;
	u32 field_byte_end_offset;
	u32 access_byte_width;
	u32 field_start_offset;
	u32 field_end_offset;
	u32 minimum_access_width = 0xFFFFFFFF;
	u32 minimum_accesses = 0xFFFFFFFF;
	u32 accesses;

	ACPI_FUNCTION_TRACE(ex_generate_access);

	/*                                                                  */

	field_byte_offset = ACPI_DIV_8(ACPI_ROUND_DOWN(field_bit_offset, 8));
	field_byte_end_offset = ACPI_DIV_8(ACPI_ROUND_UP(field_bit_length +
							 field_bit_offset, 8));
	field_byte_length = field_byte_end_offset - field_byte_offset;

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "Bit length %u, Bit offset %u\n",
			  field_bit_length, field_bit_offset));

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "Byte Length %u, Byte Offset %u, End Offset %u\n",
			  field_byte_length, field_byte_offset,
			  field_byte_end_offset));

	/*
                                                                      
                                                
   
                                                                        
  */
	for (access_byte_width = 1; access_byte_width <= 8;
	     access_byte_width <<= 1) {
		/*
                                                                      
                                                             
                                                                       
                                                                   
                  
   */
		if (ACPI_ROUND_UP(field_byte_end_offset, access_byte_width) <=
		    region_length) {
			field_start_offset =
			    ACPI_ROUND_DOWN(field_byte_offset,
					    access_byte_width) /
			    access_byte_width;

			field_end_offset =
			    ACPI_ROUND_UP((field_byte_length +
					   field_byte_offset),
					  access_byte_width) /
			    access_byte_width;

			accesses = field_end_offset - field_start_offset;

			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
					  "AccessWidth %u end is within region\n",
					  access_byte_width));

			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
					  "Field Start %u, Field End %u -- requires %u accesses\n",
					  field_start_offset, field_end_offset,
					  accesses));

			/*                          */

			if (accesses <= 1) {
				ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
						  "Entire field can be accessed with one operation of size %u\n",
						  access_byte_width));
				return_VALUE(access_byte_width);
			}

			/*
                                                                
                                                 
    */
			if (accesses < minimum_accesses) {
				minimum_accesses = accesses;
				minimum_access_width = access_byte_width;
			}
		} else {
			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
					  "AccessWidth %u end is NOT within region\n",
					  access_byte_width));
			if (access_byte_width == 1) {
				ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
						  "Field goes beyond end-of-region!\n"));

				/*                                         */

				return_VALUE(0);
			}

			/*
                                                           
                     
    */
			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
					  "Backing off to previous optimal access width of %u\n",
					  minimum_access_width));
			return_VALUE(minimum_access_width);
		}
	}

	/*
                                                  
                             
  */
	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "Cannot access field in one operation, using width 8\n"));
	return_VALUE(8);
}
示例#6
0
文件: exfldio.c 项目: AiWinters/linux
static acpi_status
acpi_ex_setup_region(union acpi_operand_object *obj_desc,
		     u32 field_datum_byte_offset)
{
	acpi_status status = AE_OK;
	union acpi_operand_object *rgn_desc;
	u8 space_id;

	ACPI_FUNCTION_TRACE_U32(ex_setup_region, field_datum_byte_offset);

	rgn_desc = obj_desc->common_field.region_obj;

	/* We must have a valid region */

	if (rgn_desc->common.type != ACPI_TYPE_REGION) {
		ACPI_ERROR((AE_INFO, "Needed Region, found type 0x%X (%s)",
			    rgn_desc->common.type,
			    acpi_ut_get_object_type_name(rgn_desc)));

		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	space_id = rgn_desc->region.space_id;

	/* Validate the Space ID */

	if (!acpi_is_valid_space_id(space_id)) {
		ACPI_ERROR((AE_INFO,
			    "Invalid/unknown Address Space ID: 0x%2.2X",
			    space_id));
		return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
	}

	/*
	 * If the Region Address and Length have not been previously evaluated,
	 * evaluate them now and save the results.
	 */
	if (!(rgn_desc->common.flags & AOPOBJ_DATA_VALID)) {
		status = acpi_ds_get_region_arguments(rgn_desc);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}

	/* Exit if Address/Length have been disallowed by the host OS */

	if (rgn_desc->common.flags & AOPOBJ_INVALID) {
		return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
	}

	/*
	 * Exit now for SMBus, GSBus or IPMI address space, it has a non-linear
	 * address space and the request cannot be directly validated
	 */
	if (space_id == ACPI_ADR_SPACE_SMBUS ||
	    space_id == ACPI_ADR_SPACE_GSBUS ||
	    space_id == ACPI_ADR_SPACE_IPMI) {

		/* SMBus or IPMI has a non-linear address space */

		return_ACPI_STATUS(AE_OK);
	}
#ifdef ACPI_UNDER_DEVELOPMENT
	/*
	 * If the Field access is any_acc, we can now compute the optimal
	 * access (because we know know the length of the parent region)
	 */
	if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
	}
#endif

	/*
	 * Validate the request. The entire request from the byte offset for a
	 * length of one field datum (access width) must fit within the region.
	 * (Region length is specified in bytes)
	 */
	if (rgn_desc->region.length <
	    (obj_desc->common_field.base_byte_offset + field_datum_byte_offset +
	     obj_desc->common_field.access_byte_width)) {
		if (acpi_gbl_enable_interpreter_slack) {
			/*
			 * Slack mode only:  We will go ahead and allow access to this
			 * field if it is within the region length rounded up to the next
			 * access width boundary. acpi_size cast for 64-bit compile.
			 */
			if (ACPI_ROUND_UP(rgn_desc->region.length,
					  obj_desc->common_field.
					  access_byte_width) >=
			    ((acpi_size) obj_desc->common_field.
			     base_byte_offset +
			     obj_desc->common_field.access_byte_width +
			     field_datum_byte_offset)) {
				return_ACPI_STATUS(AE_OK);
			}
		}

		if (rgn_desc->region.length <
		    obj_desc->common_field.access_byte_width) {
			/*
			 * This is the case where the access_type (acc_word, etc.) is wider
			 * than the region itself. For example, a region of length one
			 * byte, and a field with Dword access specified.
			 */
			ACPI_ERROR((AE_INFO,
				    "Field [%4.4s] access width (%u bytes) too large for region [%4.4s] (length %u)",
				    acpi_ut_get_node_name(obj_desc->
							  common_field.node),
				    obj_desc->common_field.access_byte_width,
				    acpi_ut_get_node_name(rgn_desc->region.
							  node),
				    rgn_desc->region.length));
		}

		/*
		 * Offset rounded up to next multiple of field width
		 * exceeds region length, indicate an error
		 */
		ACPI_ERROR((AE_INFO,
			    "Field [%4.4s] Base+Offset+Width %u+%u+%u is beyond end of region [%4.4s] (length %u)",
			    acpi_ut_get_node_name(obj_desc->common_field.node),
			    obj_desc->common_field.base_byte_offset,
			    field_datum_byte_offset,
			    obj_desc->common_field.access_byte_width,
			    acpi_ut_get_node_name(rgn_desc->region.node),
			    rgn_desc->region.length));

		return_ACPI_STATUS(AE_AML_REGION_LIMIT);
	}

	return_ACPI_STATUS(AE_OK);
}
示例#7
0
static UINT32
AcpiExGenerateAccess (
    UINT32                  FieldBitOffset,
    UINT32                  FieldBitLength,
    UINT32                  RegionLength)
{
    UINT32                  FieldByteLength;
    UINT32                  FieldByteOffset;
    UINT32                  FieldByteEndOffset;
    UINT32                  AccessByteWidth;
    UINT32                  FieldStartOffset;
    UINT32                  FieldEndOffset;
    UINT32                  MinimumAccessWidth = 0xFFFFFFFF;
    UINT32                  MinimumAccesses = 0xFFFFFFFF;
    UINT32                  Accesses;


    ACPI_FUNCTION_TRACE (ExGenerateAccess);


    /* Round Field start offset and length to "minimal" byte boundaries */

    FieldByteOffset    = ACPI_DIV_8 (ACPI_ROUND_DOWN (FieldBitOffset, 8));
    FieldByteEndOffset = ACPI_DIV_8 (ACPI_ROUND_UP   (FieldBitLength +
                                                      FieldBitOffset, 8));
    FieldByteLength    = FieldByteEndOffset - FieldByteOffset;

    ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
        "Bit length %u, Bit offset %u\n",
        FieldBitLength, FieldBitOffset));

    ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
        "Byte Length %u, Byte Offset %u, End Offset %u\n",
        FieldByteLength, FieldByteOffset, FieldByteEndOffset));

    /*
     * Iterative search for the maximum access width that is both aligned
     * and does not go beyond the end of the region
     *
     * Start at ByteAcc and work upwards to QwordAcc max. (1,2,4,8 bytes)
     */
    for (AccessByteWidth = 1; AccessByteWidth <= 8; AccessByteWidth <<= 1)
    {
        /*
         * 1) Round end offset up to next access boundary and make sure that
         *    this does not go beyond the end of the parent region.
         * 2) When the Access width is greater than the FieldByteLength, we
         *    are done. (This does not optimize for the perfectly aligned
         *    case yet).
         */
        if (ACPI_ROUND_UP (FieldByteEndOffset, AccessByteWidth) <= RegionLength)
        {
            FieldStartOffset =
                ACPI_ROUND_DOWN (FieldByteOffset, AccessByteWidth) /
                AccessByteWidth;

            FieldEndOffset =
                ACPI_ROUND_UP ((FieldByteLength + FieldByteOffset),
                    AccessByteWidth) / AccessByteWidth;

            Accesses = FieldEndOffset - FieldStartOffset;

            ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                "AccessWidth %u end is within region\n", AccessByteWidth));

            ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                "Field Start %u, Field End %u -- requires %u accesses\n",
                FieldStartOffset, FieldEndOffset, Accesses));

            /* Single access is optimal */

            if (Accesses <= 1)
            {
                ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                    "Entire field can be accessed with one operation of size %u\n",
                    AccessByteWidth));
                return_VALUE (AccessByteWidth);
            }

            /*
             * Fits in the region, but requires more than one read/write.
             * try the next wider access on next iteration
             */
            if (Accesses < MinimumAccesses)
            {
                MinimumAccesses    = Accesses;
                MinimumAccessWidth = AccessByteWidth;
            }
        }
        else
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                "AccessWidth %u end is NOT within region\n", AccessByteWidth));
            if (AccessByteWidth == 1)
            {
                ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                    "Field goes beyond end-of-region!\n"));

                /* Field does not fit in the region at all */

                return_VALUE (0);
            }

            /*
             * This width goes beyond the end-of-region, back off to
             * previous access
             */
            ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                "Backing off to previous optimal access width of %u\n",
                MinimumAccessWidth));
            return_VALUE (MinimumAccessWidth);
        }
    }

    /*
     * Could not read/write field with one operation,
     * just use max access width
     */
    ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
        "Cannot access field in one operation, using width 8\n"));
    return_VALUE (8);
}
示例#8
0
/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_system_memory_space_handler
 *
 * PARAMETERS:  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
 *              handler_context     - Pointer to Handler's context
 *              region_context      - Pointer to context specific to the
 *                                    accessed region
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handler for the System Memory address space (Op Region)
 *
 ******************************************************************************/
acpi_status
acpi_ex_system_memory_space_handler(u32 function,
				    acpi_physical_address address,
				    u32 bit_width,
				    u64 *value,
				    void *handler_context, void *region_context)
{
	acpi_status status = AE_OK;
	void *logical_addr_ptr = NULL;
	struct acpi_mem_space_context *mem_info = region_context;
	u32 length;
	acpi_size map_length;
	acpi_size page_boundary_map_length;
#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
	u32 remainder;
#endif

	ACPI_FUNCTION_TRACE(ex_system_memory_space_handler);

	/* Validate and translate the bit width */

	switch (bit_width) {
	case 8:
		length = 1;
		break;

	case 16:
		length = 2;
		break;

	case 32:
		length = 4;
		break;

	case 64:
		length = 8;
		break;

	default:
		ACPI_ERROR((AE_INFO, "Invalid SystemMemory width %u",
			    bit_width));
		return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
	}

#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
	/*
	 * Hardware does not support non-aligned data transfers, we must verify
	 * the request.
	 */
	(void)acpi_ut_short_divide((u64) address, length, NULL, &remainder);
	if (remainder != 0) {
		return_ACPI_STATUS(AE_AML_ALIGNMENT);
	}
#endif

	/*
	 * Does the request fit into the cached memory mapping?
	 * Is 1) Address below the current mapping? OR
	 *    2) Address beyond the current mapping?
	 */
	if ((address < mem_info->mapped_physical_address) ||
	    (((u64) address + length) > ((u64)
					 mem_info->mapped_physical_address +
					 mem_info->mapped_length))) {
		/*
		 * The request cannot be resolved by the current memory mapping;
		 * Delete the existing mapping and create a new one.
		 */
		if (mem_info->mapped_length) {

			/* Valid mapping, delete it */

			acpi_os_unmap_memory(mem_info->mapped_logical_address,
					     mem_info->mapped_length);
		}

		/*
		 * Attempt to map from the requested address to the end of the region.
		 * However, we will never map more than one page, nor will we cross
		 * a page boundary.
		 */
		map_length = (acpi_size)
		    ((mem_info->address + mem_info->length) - address);

		/*
		 * If mapping the entire remaining portion of the region will cross
		 * a page boundary, just map up to the page boundary, do not cross.
		 * On some systems, crossing a page boundary while mapping regions
		 * can cause warnings if the pages have different attributes
		 * due to resource management
		 */
		page_boundary_map_length =
		    ACPI_ROUND_UP(address, ACPI_DEFAULT_PAGE_SIZE) - address;

		if (!page_boundary_map_length) {
			page_boundary_map_length = ACPI_DEFAULT_PAGE_SIZE;
		}

		if (map_length > page_boundary_map_length) {
			map_length = page_boundary_map_length;
		}

		/* Create a new mapping starting at the address given */

		mem_info->mapped_logical_address = acpi_os_map_memory((acpi_physical_address) address, map_length);
		if (!mem_info->mapped_logical_address) {
			ACPI_ERROR((AE_INFO,
				    "Could not map memory at 0x%8.8X%8.8X, size %u",
				    ACPI_FORMAT_NATIVE_UINT(address),
				    (u32) map_length));
			mem_info->mapped_length = 0;
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		/* Save the physical address and mapping size */

		mem_info->mapped_physical_address = address;
		mem_info->mapped_length = map_length;
	}

	/*
	 * Generate a logical pointer corresponding to the address we want to
	 * access
	 */
	logical_addr_ptr = mem_info->mapped_logical_address +
	    ((u64) address - (u64) mem_info->mapped_physical_address);

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "System-Memory (width %u) R/W %u Address=%8.8X%8.8X\n",
			  bit_width, function,
			  ACPI_FORMAT_NATIVE_UINT(address)));

	/*
	 * Perform the memory read or write
	 *
	 * Note: For machines that do not support non-aligned transfers, the target
	 * address was checked for alignment above.  We do not attempt to break the
	 * transfer up into smaller (byte-size) chunks because the AML specifically
	 * asked for a transfer width that the hardware may require.
	 */
	switch (function) {
	case ACPI_READ:

		*value = 0;
		switch (bit_width) {
		case 8:
			*value = (u64) ACPI_GET8(logical_addr_ptr);
			break;

		case 16:
			*value = (u64) ACPI_GET16(logical_addr_ptr);
			break;

		case 32:
			*value = (u64) ACPI_GET32(logical_addr_ptr);
			break;

		case 64:
			*value = (u64) ACPI_GET64(logical_addr_ptr);
			break;

		default:
			/* bit_width was already validated */
			break;
		}
		break;

	case ACPI_WRITE:

		switch (bit_width) {
		case 8:
			ACPI_SET8(logical_addr_ptr) = (u8) * value;
			break;

		case 16:
			ACPI_SET16(logical_addr_ptr) = (u16) * value;
			break;

		case 32:
			ACPI_SET32(logical_addr_ptr) = (u32) * value;
			break;

		case 64:
			ACPI_SET64(logical_addr_ptr) = (u64) * value;
			break;

		default:
			/* bit_width was already validated */
			break;
		}
		break;

	default:
		status = AE_BAD_PARAMETER;
		break;
	}

	return_ACPI_STATUS(status);
}
示例#9
0
文件: exregion.c 项目: coyizumi/cs111
ACPI_STATUS
AcpiExSystemMemorySpaceHandler (
    UINT32                  Function,
    ACPI_PHYSICAL_ADDRESS   Address,
    UINT32                  BitWidth,
    UINT64                  *Value,
    void                    *HandlerContext,
    void                    *RegionContext)
{
    ACPI_STATUS             Status = AE_OK;
    void                    *LogicalAddrPtr = NULL;
    ACPI_MEM_SPACE_CONTEXT  *MemInfo = RegionContext;
    UINT32                  Length;
    ACPI_SIZE               MapLength;
    ACPI_SIZE               PageBoundaryMapLength;
#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
    UINT32                  Remainder;
#endif


    ACPI_FUNCTION_TRACE (ExSystemMemorySpaceHandler);


    /* Validate and translate the bit width */

    switch (BitWidth)
    {
    case 8:

        Length = 1;
        break;

    case 16:

        Length = 2;
        break;

    case 32:

        Length = 4;
        break;

    case 64:

        Length = 8;
        break;

    default:

        ACPI_ERROR ((AE_INFO, "Invalid SystemMemory width %u",
            BitWidth));
        return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
    }

#ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
    /*
     * Hardware does not support non-aligned data transfers, we must verify
     * the request.
     */
    (void) AcpiUtShortDivide ((UINT64) Address, Length, NULL, &Remainder);
    if (Remainder != 0)
    {
        return_ACPI_STATUS (AE_AML_ALIGNMENT);
    }
#endif

    /*
     * Does the request fit into the cached memory mapping?
     * Is 1) Address below the current mapping? OR
     *    2) Address beyond the current mapping?
     */
    if ((Address < MemInfo->MappedPhysicalAddress) ||
        (((UINT64) Address + Length) >
            ((UINT64)
            MemInfo->MappedPhysicalAddress + MemInfo->MappedLength)))
    {
        /*
         * The request cannot be resolved by the current memory mapping;
         * Delete the existing mapping and create a new one.
         */
        if (MemInfo->MappedLength)
        {
            /* Valid mapping, delete it */

            AcpiOsUnmapMemory (MemInfo->MappedLogicalAddress,
                MemInfo->MappedLength);
        }

        /*
         * October 2009: Attempt to map from the requested address to the
         * end of the region. However, we will never map more than one
         * page, nor will we cross a page boundary.
         */
        MapLength = (ACPI_SIZE)
            ((MemInfo->Address + MemInfo->Length) - Address);

        /*
         * If mapping the entire remaining portion of the region will cross
         * a page boundary, just map up to the page boundary, do not cross.
         * On some systems, crossing a page boundary while mapping regions
         * can cause warnings if the pages have different attributes
         * due to resource management.
         *
         * This has the added benefit of constraining a single mapping to
         * one page, which is similar to the original code that used a 4k
         * maximum window.
         */
        PageBoundaryMapLength = (ACPI_SIZE)
            (ACPI_ROUND_UP (Address, ACPI_DEFAULT_PAGE_SIZE) - Address);
        if (PageBoundaryMapLength == 0)
        {
            PageBoundaryMapLength = ACPI_DEFAULT_PAGE_SIZE;
        }

        if (MapLength > PageBoundaryMapLength)
        {
            MapLength = PageBoundaryMapLength;
        }

        /* Create a new mapping starting at the address given */

        MemInfo->MappedLogicalAddress = AcpiOsMapMemory (Address, MapLength);
        if (!MemInfo->MappedLogicalAddress)
        {
            ACPI_ERROR ((AE_INFO,
                "Could not map memory at 0x%8.8X%8.8X, size %u",
                ACPI_FORMAT_UINT64 (Address), (UINT32) MapLength));
            MemInfo->MappedLength = 0;
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        /* Save the physical address and mapping size */

        MemInfo->MappedPhysicalAddress = Address;
        MemInfo->MappedLength = MapLength;
    }

    /*
     * Generate a logical pointer corresponding to the address we want to
     * access
     */
    LogicalAddrPtr = MemInfo->MappedLogicalAddress +
        ((UINT64) Address - (UINT64) MemInfo->MappedPhysicalAddress);

    ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
        "System-Memory (width %u) R/W %u Address=%8.8X%8.8X\n",
        BitWidth, Function, ACPI_FORMAT_UINT64 (Address)));

    /*
     * Perform the memory read or write
     *
     * Note: For machines that do not support non-aligned transfers, the target
     * address was checked for alignment above. We do not attempt to break the
     * transfer up into smaller (byte-size) chunks because the AML specifically
     * asked for a transfer width that the hardware may require.
     */
    switch (Function)
    {
    case ACPI_READ:

        *Value = 0;
        switch (BitWidth)
        {
        case 8:

            *Value = (UINT64) ACPI_GET8 (LogicalAddrPtr);
            break;

        case 16:

            *Value = (UINT64) ACPI_GET16 (LogicalAddrPtr);
            break;

        case 32:

            *Value = (UINT64) ACPI_GET32 (LogicalAddrPtr);
            break;

        case 64:

            *Value = (UINT64) ACPI_GET64 (LogicalAddrPtr);
            break;

        default:

            /* BitWidth was already validated */

            break;
        }
        break;

    case ACPI_WRITE:

        switch (BitWidth)
        {
        case 8:

            ACPI_SET8 (LogicalAddrPtr, *Value);
            break;

        case 16:

            ACPI_SET16 (LogicalAddrPtr, *Value);
            break;

        case 32:

            ACPI_SET32 (LogicalAddrPtr, *Value);
            break;

        case 64:

            ACPI_SET64 (LogicalAddrPtr, *Value);
            break;

        default:

            /* BitWidth was already validated */

            break;
        }
        break;

    default:

        Status = AE_BAD_PARAMETER;
        break;
    }

    return_ACPI_STATUS (Status);
}
示例#10
0
acpi_status
acpi_ex_setup_region (
	union acpi_operand_object       *obj_desc,
	u32                             field_datum_byte_offset)
{
	acpi_status                     status = AE_OK;
	union acpi_operand_object       *rgn_desc;


	ACPI_FUNCTION_TRACE_U32 ("ex_setup_region", field_datum_byte_offset);


	rgn_desc = obj_desc->common_field.region_obj;

	/* We must have a valid region */

	if (ACPI_GET_OBJECT_TYPE (rgn_desc) != ACPI_TYPE_REGION) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Needed Region, found type %X (%s)\n",
			ACPI_GET_OBJECT_TYPE (rgn_desc),
			acpi_ut_get_object_type_name (rgn_desc)));

		return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
	}

	/*
	 * If the Region Address and Length have not been previously evaluated,
	 * evaluate them now and save the results.
	 */
	if (!(rgn_desc->common.flags & AOPOBJ_DATA_VALID)) {
		status = acpi_ds_get_region_arguments (rgn_desc);
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	if (rgn_desc->region.space_id == ACPI_ADR_SPACE_SMBUS) {
		/* SMBus has a non-linear address space */

		return_ACPI_STATUS (AE_OK);
	}

#ifdef ACPI_UNDER_DEVELOPMENT
	/*
	 * If the Field access is any_acc, we can now compute the optimal
	 * access (because we know know the length of the parent region)
	 */
	if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}
#endif

	/*
	 * Validate the request.  The entire request from the byte offset for a
	 * length of one field datum (access width) must fit within the region.
	 * (Region length is specified in bytes)
	 */
	if (rgn_desc->region.length < (obj_desc->common_field.base_byte_offset
			   + field_datum_byte_offset
			   + obj_desc->common_field.access_byte_width)) {
		if (rgn_desc->region.length < obj_desc->common_field.access_byte_width) {
			/*
			 * This is the case where the access_type (acc_word, etc.) is wider
			 * than the region itself.  For example, a region of length one
			 * byte, and a field with Dword access specified.
			 */
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
				"Field [%4.4s] access width (%d bytes) too large for region [%4.4s] (length %X)\n",
				obj_desc->common_field.node->name.ascii, obj_desc->common_field.access_byte_width,
				rgn_desc->region.node->name.ascii, rgn_desc->region.length));
		}

		/*
		 * Offset rounded up to next multiple of field width
		 * exceeds region length, indicate an error
		 */
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Field [%4.4s] Base+Offset+Width %X+%X+%X is beyond end of region [%4.4s] (length %X)\n",
			obj_desc->common_field.node->name.ascii, obj_desc->common_field.base_byte_offset,
			field_datum_byte_offset, obj_desc->common_field.access_byte_width,
			rgn_desc->region.node->name.ascii, rgn_desc->region.length));

		#ifdef CONFIG_ACPI_RELAXED_AML
		{
			/*
			 * Allow access to the field if it is within the region size
			 * rounded up to a multiple of the access byte width.  This
			 * overcomes "off-by-one" programming errors in the AML often
			 * found in Toshiba laptops.  These errors were allowed by
			 * the Microsoft ASL compiler.
			 */
			u32 rounded_length = ACPI_ROUND_UP(rgn_desc->region.length,
									obj_desc->common_field.access_byte_width);

			if (rounded_length < (obj_desc->common_field.base_byte_offset
						+ field_datum_byte_offset
						+ obj_desc->common_field.access_byte_width)) {
				return_ACPI_STATUS (AE_AML_REGION_LIMIT);
			} else {
				static int	warn_once = 1;
				if (warn_once) {
					// Could also associate a flag with each field, and
					// warn once for each field.
					ACPI_REPORT_WARNING((
						"The ACPI AML in your computer contains errors, "
						"please nag the manufacturer to correct it.\n"));
					ACPI_REPORT_WARNING((
						"Allowing relaxed access to fields; "
						"turn on CONFIG_ACPI_DEBUG for details.\n"));
					warn_once = 0;
				}
				return_ACPI_STATUS (AE_OK);
			}
		}
		#else
			return_ACPI_STATUS (AE_AML_REGION_LIMIT);
		#endif
	}

	return_ACPI_STATUS (AE_OK);
}
示例#11
0
文件: hwregs.c 项目: alex1818/fwts
ACPI_STATUS
AcpiHwWrite (
    UINT32                  Value,
    ACPI_GENERIC_ADDRESS    *Reg)
{
    UINT64                  Address;
    UINT8                   AccessWidth;
    UINT32                  BitWidth;
    UINT8                   BitOffset;
    UINT64                  Value64;
    UINT32                  NewValue32, OldValue32;
    UINT8                   Index;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_NAME (HwWrite);


    /* Validate contents of the GAS register */

    Status = AcpiHwValidateRegister (Reg, 32, &Address);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /* Convert AccessWidth into number of bits based */

    AccessWidth = Reg->AccessWidth ? Reg->AccessWidth : 1;
    AccessWidth = 1 << (AccessWidth + 2);
    BitWidth = ACPI_ROUND_UP (Reg->BitOffset + Reg->BitWidth, AccessWidth);
    BitOffset = Reg->BitOffset;

    /*
     * Two address spaces supported: Memory or IO. PCI_Config is
     * not supported here because the GAS structure is insufficient
     */
    Index = 0;
    while (BitWidth)
    {
        NewValue32 = ACPI_GET_BITS (&Value, (Index * AccessWidth),
            ((1 << AccessWidth) - 1));

        if (BitOffset > AccessWidth)
        {
            BitOffset -= AccessWidth;
        }
        else
        {
            if (BitOffset)
            {
                NewValue32 &= ACPI_MASK_BITS_BELOW (BitOffset);
            }

            if (BitWidth < AccessWidth)
            {
                NewValue32 &= ACPI_MASK_BITS_ABOVE (BitWidth);
            }

            if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY)
            {
                if (BitOffset || BitWidth < AccessWidth)
                {
                    /*
                     * Read old values in order not to modify the bits that
                     * are beyond the register BitWidth/BitOffset setting.
                     */
                    Status = AcpiOsReadMemory ((ACPI_PHYSICAL_ADDRESS)
                        Address + Index * ACPI_DIV_8 (AccessWidth),
                        &Value64, AccessWidth);
                    OldValue32 = (UINT32) Value64;

                    if (BitOffset)
                    {
                        OldValue32 &= ACPI_MASK_BITS_ABOVE (BitOffset + 1);
                        BitOffset = 0;
                    }

                    if (BitWidth < AccessWidth)
                    {
                        OldValue32 &= ACPI_MASK_BITS_BELOW (BitWidth - 1);
                    }

                    NewValue32 |= OldValue32;
                }

                Value64 = (UINT64) NewValue32;
                Status = AcpiOsWriteMemory ((ACPI_PHYSICAL_ADDRESS)
                    Address + Index * ACPI_DIV_8 (AccessWidth),
                    Value64, AccessWidth);
            }
            else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
            {
                if (BitOffset || BitWidth < AccessWidth)
                {
                    /*
                     * Read old values in order not to modify the bits that
                     * are beyond the register BitWidth/BitOffset setting.
                     */
                    Status = AcpiHwReadPort ((ACPI_IO_ADDRESS)
                        Address + Index * ACPI_DIV_8 (AccessWidth),
                        &OldValue32, AccessWidth);

                    if (BitOffset)
                    {
                        OldValue32 &= ACPI_MASK_BITS_ABOVE (BitOffset + 1);
                        BitOffset = 0;
                    }

                    if (BitWidth < AccessWidth)
                    {
                        OldValue32 &= ACPI_MASK_BITS_BELOW (BitWidth - 1);
                    }

                    NewValue32 |= OldValue32;
                }

                Status = AcpiHwWritePort ((ACPI_IO_ADDRESS)
                    Address + Index * ACPI_DIV_8 (AccessWidth),
                    NewValue32, AccessWidth);
            }
        }

        BitWidth -= BitWidth > AccessWidth ? AccessWidth : BitWidth;
        Index++;
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_IO,
        "Wrote: %8.8X width %2d   to %8.8X%8.8X (%s)\n",
        Value, AccessWidth, ACPI_FORMAT_UINT64 (Address),
        AcpiUtGetRegionName (Reg->SpaceId)));

    return (Status);
}
示例#12
0
文件: hwregs.c 项目: alex1818/fwts
ACPI_STATUS
AcpiHwRead (
    UINT32                  *Value,
    ACPI_GENERIC_ADDRESS    *Reg)
{
    UINT64                  Address;
    UINT8                   AccessWidth;
    UINT32                  BitWidth;
    UINT8                   BitOffset;
    UINT64                  Value64;
    UINT32                  Value32;
    UINT8                   Index;
    ACPI_STATUS             Status;


    ACPI_FUNCTION_NAME (HwRead);


    /* Validate contents of the GAS register */

    Status = AcpiHwValidateRegister (Reg, 32, &Address);
    if (ACPI_FAILURE (Status))
    {
        return (Status);
    }

    /*
     * Initialize entire 32-bit return value to zero, convert AccessWidth
     * into number of bits based
     */
    *Value = 0;
    AccessWidth = Reg->AccessWidth ? Reg->AccessWidth : 1;
    AccessWidth = 1 << (AccessWidth + 2);
    BitWidth = ACPI_ROUND_UP (Reg->BitOffset + Reg->BitWidth, AccessWidth);
    BitOffset = Reg->BitOffset;

    /*
     * Two address spaces supported: Memory or IO. PCI_Config is
     * not supported here because the GAS structure is insufficient
     */
    Index = 0;
    while (BitWidth)
    {
        if (BitOffset > AccessWidth)
        {
            Value32 = 0;
            BitOffset -= AccessWidth;
        }
        else
        {
            if (Reg->SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY)
            {
                Status = AcpiOsReadMemory ((ACPI_PHYSICAL_ADDRESS)
                    Address + Index * ACPI_DIV_8 (AccessWidth),
                    &Value64, AccessWidth);
                Value32 = (UINT32) Value64;
            }
            else /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
            {
                Status = AcpiHwReadPort ((ACPI_IO_ADDRESS)
                    Address + Index * ACPI_DIV_8 (AccessWidth),
                    &Value32, AccessWidth);
            }

            if (BitOffset)
            {
                Value32 &= ACPI_MASK_BITS_BELOW (BitOffset);
                BitOffset = 0;
            }
            if (BitWidth < AccessWidth)
            {
                Value32 &= ACPI_MASK_BITS_ABOVE (BitWidth);
            }
        }

        ACPI_SET_BITS (Value, Index * AccessWidth,
            ((1 << AccessWidth) - 1), Value32);

        BitWidth -= BitWidth > AccessWidth ? AccessWidth : BitWidth;
        Index++;
    }

    ACPI_DEBUG_PRINT ((ACPI_DB_IO,
        "Read:  %8.8X width %2d from %8.8X%8.8X (%s)\n",
        *Value, AccessWidth, ACPI_FORMAT_UINT64 (Address),
        AcpiUtGetRegionName (Reg->SpaceId)));

    return (Status);
}
示例#13
0
文件: hwregs.c 项目: alex1818/fwts
ACPI_STATUS
AcpiHwValidateRegister (
    ACPI_GENERIC_ADDRESS    *Reg,
    UINT8                   MaxBitWidth,
    UINT64                  *Address)
{
    UINT8                   BitWidth;
    UINT8                   AccessWidth;


    /* Must have a valid pointer to a GAS structure */

    if (!Reg)
    {
        return (AE_BAD_PARAMETER);
    }

    /*
     * Copy the target address. This handles possible alignment issues.
     * Address must not be null. A null address also indicates an optional
     * ACPI register that is not supported, so no error message.
     */
    ACPI_MOVE_64_TO_64 (Address, &Reg->Address);
    if (!(*Address))
    {
        return (AE_BAD_ADDRESS);
    }

    /* Validate the SpaceID */

    if ((Reg->SpaceId != ACPI_ADR_SPACE_SYSTEM_MEMORY) &&
        (Reg->SpaceId != ACPI_ADR_SPACE_SYSTEM_IO))
    {
        ACPI_ERROR ((AE_INFO,
            "Unsupported address space: 0x%X", Reg->SpaceId));
        return (AE_SUPPORT);
    }

    /* Validate the AccessWidth */

    if (Reg->AccessWidth > 4)
    {
        ACPI_ERROR ((AE_INFO,
            "Unsupported register access width: 0x%X", Reg->AccessWidth));
        return (AE_SUPPORT);
    }

    /* Validate the BitWidth, convert AccessWidth into number of bits */

    AccessWidth = Reg->AccessWidth ? Reg->AccessWidth : 1;
    AccessWidth = 1 << (AccessWidth + 2);
    BitWidth = ACPI_ROUND_UP (Reg->BitOffset + Reg->BitWidth, AccessWidth);
    if (MaxBitWidth < BitWidth)
    {
        ACPI_WARNING ((AE_INFO,
            "Requested bit width 0x%X is smaller than register bit width 0x%X",
            MaxBitWidth, BitWidth));
        return (AE_SUPPORT);
    }

    return (AE_OK);
}
示例#14
0
acpi_status
acpi_ex_setup_region (
	union acpi_operand_object       *obj_desc,
	u32                             field_datum_byte_offset)
{
	acpi_status                     status = AE_OK;
	union acpi_operand_object       *rgn_desc;


	ACPI_FUNCTION_TRACE_U32 ("ex_setup_region", field_datum_byte_offset);


	rgn_desc = obj_desc->common_field.region_obj;

	/* We must have a valid region */

	if (ACPI_GET_OBJECT_TYPE (rgn_desc) != ACPI_TYPE_REGION) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Needed Region, found type %X (%s)\n",
			ACPI_GET_OBJECT_TYPE (rgn_desc),
			acpi_ut_get_object_type_name (rgn_desc)));

		return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
	}

	/*
	 * If the Region Address and Length have not been previously evaluated,
	 * evaluate them now and save the results.
	 */
	if (!(rgn_desc->common.flags & AOPOBJ_DATA_VALID)) {
		status = acpi_ds_get_region_arguments (rgn_desc);
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	if (rgn_desc->region.space_id == ACPI_ADR_SPACE_SMBUS) {
		/* SMBus has a non-linear address space */

		return_ACPI_STATUS (AE_OK);
	}

#ifdef ACPI_UNDER_DEVELOPMENT
	/*
	 * If the Field access is any_acc, we can now compute the optimal
	 * access (because we know know the length of the parent region)
	 */
	if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}
#endif

	/*
	 * Validate the request.  The entire request from the byte offset for a
	 * length of one field datum (access width) must fit within the region.
	 * (Region length is specified in bytes)
	 */
	if (rgn_desc->region.length < (obj_desc->common_field.base_byte_offset
			   + field_datum_byte_offset
			   + obj_desc->common_field.access_byte_width)) {
		if (acpi_gbl_enable_interpreter_slack) {
			/*
			 * Slack mode only:  We will go ahead and allow access to this
			 * field if it is within the region length rounded up to the next
			 * access width boundary.
			 */
			if (ACPI_ROUND_UP (rgn_desc->region.length,
					   obj_desc->common_field.access_byte_width) >=
				(obj_desc->common_field.base_byte_offset +
				 (acpi_native_uint) obj_desc->common_field.access_byte_width +
				 field_datum_byte_offset)) {
				return_ACPI_STATUS (AE_OK);
			}
		}

		if (rgn_desc->region.length < obj_desc->common_field.access_byte_width) {
			/*
			 * This is the case where the access_type (acc_word, etc.) is wider
			 * than the region itself.  For example, a region of length one
			 * byte, and a field with Dword access specified.
			 */
			ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
				"Field [%4.4s] access width (%d bytes) too large for region [%4.4s] (length %X)\n",
				acpi_ut_get_node_name (obj_desc->common_field.node),
				obj_desc->common_field.access_byte_width,
				acpi_ut_get_node_name (rgn_desc->region.node), rgn_desc->region.length));
		}

		/*
		 * Offset rounded up to next multiple of field width
		 * exceeds region length, indicate an error
		 */
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Field [%4.4s] Base+Offset+Width %X+%X+%X is beyond end of region [%4.4s] (length %X)\n",
			acpi_ut_get_node_name (obj_desc->common_field.node),
			obj_desc->common_field.base_byte_offset,
			field_datum_byte_offset, obj_desc->common_field.access_byte_width,
			acpi_ut_get_node_name (rgn_desc->region.node), rgn_desc->region.length));

		return_ACPI_STATUS (AE_AML_REGION_LIMIT);
	}

	return_ACPI_STATUS (AE_OK);
}