PsiFS: SWI Calls

PsiFS_FileOp

PsiFS_FileOp
(SWI &520C9)

Perform a miscellaneous file system operation

On entry: R0 = reason code

Other registers depend on reason code

On exit: Registers depend on reason code

Interrupts: Interrupt status is undefined
Fast interrupts are enabled

Processor mode: Processor is in SVC mode

Re-entrancy: SWI is not re-entrant

Use:

This call performs a miscellaneous file system operation, depending on the reason code in R0. Valid reason codes are:

Value	Meaning
0	change the name of a disc

This call extends the facilities available via the standard FileSwitch interface.

Related SWIs: OS_FSControl

Related vectors: None

`PsiFS_FileOp 0` `(SWI &520C9)`
	Change the name of a disc

On entry:	R0 =	0
	R1 =	drive
	R2 =	pointer to control-character terminated disc name string

On exit:	Registers preserved

Use:	This call changes the name of the specified remote drive, avpoiding the 10 character limit imposed by FileSwitch. The drive may be specified in one of three ways: a zero based index (0 for drive A, through to 25 for drive Z) the ASCII code of the drive letter in upper case (65 for drive A, through to 90 for drive Z) the ASCII code of the drive letter in lower case (97 for drive A, through to 122 for drive Z)