pTAL Reference Manual (H06.08+)

Built-In Routines

HP pTAL Reference Manual—523746-006

15-63

$LOCKPAGE

$LOCATESPTHDR returns in sptbase the address of the segment-page table for the

address in virtaddr.

$LOCKPAGE

$LOCKPAGE locks one page of memory.

only-if-locked input

sINT:value

is an INT value. If only-if-locked is greater than or equal to zero, the

page will always be locked. If only-if-locked is less than zero, the page

will be locked (that is, lock count will be incremented) only if it is already

locked.

lock-count input

sINT:value

is the total number of bytes to lock in the page.

Example 15-55. $LOCATESPTHDR Routine

INT headersize;

EXTADDR addr;

EXTADDR seg_page_table_base;

$LOCATESPTHDR(headersize, addr, seg_page_table_base);

Note. The EpTAL compiler does not support this procedure.

pTAL privileged procedure Yes

Can be executed only by privileged procedures Yes

Sets condition code Yes

Sets $CARRY Yes

Sets $OVERFLOW No

) ;

virtaddr

VST646.vsd

(

$LOCKPAGE

only-if-locked lock-count