Re: [MI400] ACCESS to IFS

[Dave McKenzie <davemck@xxxxxxxxxxxxx>]

I'm using "pointer" in the generic sense--these are not 16 byte MI pointers,
but 8 byte virtual addresses.  They're manipulated by SLIC code below the MI,
not QSYS pgms above the MI.

The "pointer" to the DSI is the address of the beginning of the index object,
not to an entry.  (However the pointer to the DS record IS the address of the
record.)

A pointer (in any sense) can't point to an entry in any kind of index because
an index entry doesn't exist as a contiguous group of bytes; it's made up of
(possibly) multiple nodes at various places in a binary tree.  The SLIC code
that does index retrieval collects data from the nodes into a contiguous
bytestring that's returned to your pgm.

--Dave

On Thursday 03 January 2002 17:58, srichter wrote:
> From: Dave McKenzie <davemck@zbiggroup.com>
>
> >If there are multiple hard links to a *STMF, the *STMF's pointer to the
> > DSI is empty.  But the *STMF's pointer to the DS (Data
>
> DSI is data space index.  Is the pointer to the DSI a 16 byte pointer ?  Is
> this a pointer to the index object or an entry in the index ?
>
> The point of my question being: can a pointer be set to a data space index
> entry ? And can a pointer be set to a user index entry ? So that an index
> entry could be accessed without the use of the FNDINXEN instruction.
>
> Thanks,
>
> Steve Richter