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Inside Macintosh: Devices /

Chapter 2 - Slot Manager / Slot Manager Reference

Low-Level Routines /

SInitPRAMRecs

This function is used only by the Macintosh Operating System.

FUNCTION SInitPRAMRecs (spBlkPtr: SpBlockPtr): OSErr;

spBlkPtr

A pointer to a Slot Manager parameter block.

DESCRIPTION

The SInitPRAMRecs function scans every slot and checks its BoardId value against the value stored in PRAM. If the values do not match, the fCardIsChanged flag is set and the board sResource is searched for a PRAMInitData entry. If one is found, the sPRAMRecord for the slot is initialized with the data from the card's sPRAMInit record; otherwise it is initialized to 0. The contents of the parameter block are undefined.

SPECIAL CONSIDERATIONS

The SInitPRAMRecs function may move memory.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for the SInitPRAMRecs function are

Trap macro	Selector
_SlotManager	$0025

On entry, register D0 contains the routine selector and register A0 contains the address of the Slot Manager parameter block. When _SlotManager returns, register D0 contains the result code.

Registers on entry
A0	Address of the parameter block
D0	$0025

Registers on exit
D0	Result code

RESULT CODES

noErr	0	No error
smUnExBusErr	-308	A bus error occurred
smDisposePErr	-312	An error occurred during execution of DisposePtr

SEE ALSO

For more information about Slot Manager initialization, see "About the Slot Manager," beginning on page 2-15.