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Inside Macintosh: Devices /

Chapter 2 - Slot Manager / Slot Manager Reference

Data Structures

Slot Execution Parameter Block

The SGetDriver and SExec functions load and execute code from an sResource. These routines use the slot execution parameter block to exchange information with this code. The slot execution parameter block is defined by the SEBlock data type.

TYPE SEBlock =                   {slot execution parameter block}
PACKED RECORD
   seSlot:        SignedByte;    {slot number}
   sesRsrcID:     SignedByte;    {sResource ID}
   seStatus:      Integer;       {status of sExecBlock code}
   seFlags:       SignedByte;    {flags}
   seFiller0:     SignedByte;    {filler for word alignment}
   seFiller1:     SignedByte;    {filler}
   seFiller2:     SignedByte;    {filler}
   seResult:      LongInt;       {result of SLoadDriver}
   seIOFileName:  LongInt;       {pointer to driver name}
   seDevice:      SignedByte;    {device to read from}
   sePartition:   SignedByte;    {the partition}
   seOSType:      SignedByte;    {type of OS}
   seReserved:    SignedByte;    {reserved}
   seRefNum:      SignedByte;    {driver reference number}
   seNumDevices:  SignedByte;    {number of devices to load}
   seBootState:   SignedByte;    {state of StartBoot code}
END;

Field Description

seSlot

The slot number containing the code to be executed.

sesRsrcID

The sResource containing the code to be executed.

seStatus

The status returned by the executed code. A card's PrimaryInit routine returns its initialization status in this field, and the value is stored in the siInitStatusV field of the slot information record.

seFlags

Flags passed to or returned by the executed code.

	Name	Bit	Meaning
	fWarmStart	2	Set if a restart is being performed.
	dRAMBased	6	Set if the seResult field contains a handle to a device driver.

seFiller0-2

Reserved.

seResult

A result value returned by the executed code. Normally used to return a pointer or handle to a device driver.

seIOFileName

An optional pointer to a device driver name.

seDevice

The device number containing the code to be executed. This field is used when loading code from a device attached to a card.

sePartition

The partition number containing the code to be executed. This field is used when loading code from a device attached to a card.

seOSType

The operating system type identifier obtained from parameter RAM. This field is used when loading code from a device attached to a card.

seReserved

Additional information from parameter RAM, used when loading code from a device attached to a card.

seRefNum

The driver reference number returned by the loaded device driver.

seNumDevices

Unused.

seBootState

A value indicating the relative state of the boot process. During initialization, the Slot Manager passes one of the following constant values in this field:

	Name	Value	Meaning
	sbState0	0	State 0 of the boot process.
	sbState1	1	State 1 the boot process.