pTAL Conversion Guide

pTAL Built-In Routines

pTAL Conversion Guide—527302-002

18-40

$READSPT

$READSPT makes a copy of an entry from the Segment Page Table (SPT). Both the

SPT and the copy are in extended memory.

virtaddr input

EXTADDR:value

is the virtual extended memory address of the SPT entry to copy.

sptentryaddr output

EXTADDR:variable

is the extended memory address at which $READSPT stores the SPT entry.

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

Figure 18-17. TAL Code Equivalent to $READSPT Routine

STACK virtaddr;

CODE(RSPT);

STORE sptentry;

Example 18-28. Call to $READSPT Routine

EXTADDR virtual_addr;

INT .EXT spt_entry(spt_template) := spt_entry_addr;

$READSPT(virtual_addr, @spt_entry);

( ,

)

VST650.vsd

$READSPT

virtaddr sptentryaddr