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From: =?iso-8859-1?Q?=22Dehmel=2C_R=FCdiger=22?= <de AT lmnet DOT de>
To: "'cygwin'" <cygwin AT sources DOT redhat DOT com>
Cc: "'vinschen AT cygnus DOT com'" <vinschen AT cygnus DOT com>
Subject: AW: I'm new in cygwin: how to mmap?
Date: Tue, 12 Sep 2000 12:35:17 +0200
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Thank you for your fast reply Corinna!

I found the mail list address in the README on the ftp whre I download
cygwin.

I'm now a member of the cygwin group. :-)

when I try to port my software there was no problem with mmap() but
open("/dev/mem", ...); fails because there is no "/dev/mem".

mmap() can do different things depending on what open file descriptor
is passed to mmap().

There is no problem with permissions because I change /dev/mem in LINUX to
user rw
and I can do the same with the winobj \device\PhysicalMemory (Tool:
winobj.exe)

I have also sample code to map NT kernal memory to user-space
( like LINUX: /dev/kmem ) but it is stille more complicated to get physical
0xD0000
I need some HalTranslateBusAddress() ..

I hope that cygwin can emulate the open("/dev/mem") in combination with
mmap().

Any help?

Ruediger

> -----Ursprüngliche Nachricht-----
> Von:	Corinna Vinschen [SMTP:vinschen AT cygnus DOT com]
> Gesendet am:	Dienstag, 12. September 2000 11:31
> An:	Dehmel AT cygnus DOT com; Rüdiger
> Cc:	'cygwin AT sources DOT redhat DOT com'
> Betreff:	Re: I'm new in cygwin: how to mmap?
> 
> "Dehmel, Rüdiger" wrote:
> > 
> > Hello,
> > 
> > first of all: how to subcribe to this group? (please answer to:
> de AT lmnet DOT de
> > )
> 
> How did you find this group???
> 
> Read http://sources.redhat.com/cygwin/lists.html
> It contains all necessary information.
> 
> > I must memory map my hardware (ISA memory address: 0xD0000 - 0xD1FFFF)
> to
> > user address space.
> > 
> > In LINUX I do this:
> > 
> > md = open("/dev/mem", ...);
> > base = mmap(0, length, ...    0xD0000, md , ..);
> > ....
> > *base = 0x77;   // write the bits 0x77 direct to the hardware
> > ....
> > 
> > What is the replacement with cygwin on NT?
> 
> Try using mmap().
> 
> Corinna
> 
> -- 
> Corinna Vinschen                  Please, send mails regarding Cygwin to
> Cygwin Developer                        mailto:cygwin AT sources DOT redhat DOT com
> Red Hat, Inc.
> mailto:vinschen AT cygnus DOT com

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