| Title: | DIGITAL UNIX (FORMERLY KNOWN AS DEC OSF/1) |
| Notice: | Welcome to the Digital UNIX Conference |
| Moderator: | SMURF::DENHAM |
| Created: | Thu Mar 16 1995 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 10068 |
| Total number of notes: | 35879 |
HI all, I've been contacted by a customer that must have access to palcode from a device driver written in C. Customer must acces the register ABOX_CTL. How can this be accomplished? I know that there is a CALL_PAL instruction available in assembler, can I use it within a C program wia asm macro? If yes, how? If no, how can I access PALCODE? Thanks in advance Angelo
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 9072.1 | QUARRY::neth | Craig Neth | Fri Mar 07 1997 12:57 | 11 | |
I don't know anything about getting at that register, but the
following code shows how to do a pal call using an asm:
#include <c_asm.h>
pal_imb()
{
asm ("call_pal 134", 1); /* pal_imb */
}
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| 9072.2 | SMURF::DENHAM | Digital UNIX Kernel | Fri Mar 07 1997 13:19 | 3 | |
The pal "registers" are only available to the pal code itself.
Maybe telling more about what the customer is really trying
to do and why would help here?
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| 9072.3 | Working on it | WASTED::map | Mark Parenti, Unix Engineering Group | Fri Mar 07 1997 16:11 | 18 |
I forwarded this note to our CPU Technical Leader and he is in contact with the original noter. There are several issues here: 1) Chip registers are only accessible to the PAL, not to the OS directly 2) There are OS routines to call to the PAL (without using ASM) 3) The register in question is only available on EV4 - so any code that accesses it is NOT portable Mail has been sent to ask what Jeff has asked - What is the customer trying to do? Mark Parenti UEG | |||||