[HECnet] RSX question

[Johnny Billquist]

On 2015-07-20 04:56, Dave McGuire wrote:
>
>    Hey folks.  Can anyone tell me offhand how to map the I/O page into a
> task's address space under RSX-11M in Macro-11?

There are several ways. The easiest is to build the task privileged (/PR 
to TKB). Such a task will be limited to 2 APRs (5 & 6), while APRs 0-4 
are mapped to the kernel and APR 7 is the I/O page.

Another way is to switch to kernel mode in the task using SWST$. For 
this, you still need to build the task privileged, but you can build it 
without getting the limited address space mentioned above.

A third is to create a common region which is the I/O page, and then 
task build against that common region, or else create a window to that 
region at runtime, using CRRG$ and MAP$.

The common region way is documented in some manual, but I don't remember 
offhand which one.

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol