pTAL Conversion Guide

pTAL Built-In Routines

pTAL Conversion Guide—527302-002

18-33

$LOCATESPTHDR

$LOCATESPTHDR provides the address of the segment page table (SPT).

headersize input

uINT:value

is the unsigned byte offset from the beginning of the SPT to the beginning of the

header. Because the SPT header always precedes the SPT, headersize is

subtracted from the address of the SPT to obtain the address of the start of the

header.

virtaddr input

EXTADDR:value

is the extended memory address of the SPT.

Example 18-22. Call to $INTERROGATEIO Routine

INT select;

INT rank_channel;

INT ric_interrupt_status;

INT rist_interrupt_cause;

INT channel_status;

$INTERROGATEIO(select, rank_channel, ric_interrupt_status,

rist_interrupt_status, channel_status);

Note. The EpTAL compiler does not support this procedure.

pTAL privileged procedure No

Can be executed only by privileged procedures Yes

Sets condition code No

Sets $CARRY Yes

Sets $OVERFLOW No

$LOCATESPTHDR (

headersize

) ;

VST645.vsd

virtaddr

sptbase