Re: direct I/O access
- From: Mike Meyer <mwm-keyword-freebsdhackers2.e313df@xxxxxxxxx>
- Date: Wed, 30 May 2007 02:43:07 -0400
In <20070529181027.65AD5700009C@xxxxxxxxxxxxxxxxxxx>, rmgls@xxxxxxxxxx typed:
Sorry for cross posting, but perhaps hackers is a better list than multimedia
for this topic.
Probably.
i am trying to port my old assembler soft for Dos to FreeBSD.
You have my sympathy.
i need to write and read directly to the midi and scsi device.
when i try something like this i receive a sigbus error
SORRY, i am NOT nor a C nor a FreeBSD expert!!!
all i know is Assembly language!
You may have to learn some. Or at least be able to read it.
And I have to ask. The hardware has changed a lot since the days of
DoS, and things that worked then may cause strange results on modern
hardware. Do you know modern hardware, or are you still using dos-era
hardware?
i made some search in the devel handbook and did not found the solution.
What is wrong here?
Can you enlight me please?
Many thanks in advance and bests regards
Raoul
rmgls@xxxxxxxxxxx
---cut---
.data
.align 4
params: .word 0x330,2,1 # midi port => enabling IO ???
.text
.align 4
.global _start
_start:
nop
pushl params
pushl $0x3
I believe this should be $0x4, as you want to *set* the values, not
get them.
You also need to open the file "/dev/io". I believe that leaving this
file open for anything more than a handful of instructions would be a
bad thing, but I'm not going to verify it.
Best of luck,
<mike
movl $0Xa5,%eax
int $0x80
addl $0x08,%esp
movw $0x331,%dx # status register
inb %dx,%al
# ...
pushl $0 # exit
movl $0x1,%eax
int $0x80
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--
Mike Meyer <mwm@xxxxxxxxx> http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.
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