What is truly disappointing is that (as I understand it) using mmap() to map
a real address to a specified virtual location can't be used in the kernel
(or am I missing something?) Also I've tried to use mmap() to address (in
user-space) reserved memory to the same address that ioremap() gives to a
kernel module and it's failed.
Norman Dresner
Fellow Systems Engineer &(SGI) Advanced Signal Processing Laboratory
Administrator
Radar Systems Engineering Department
Electronic Systems and Sensors Segment
Northrop Grumman Corporation
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> -----Original Message-----
> From: C. W. Wright (1698) [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, April 25, 2001 8:00 AM
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Subject: Re: [rtl] How to do shared memory with pointers?
>
>
>
> > I guess I'm a little disappointed. I would of though the kernel would be
> > able to return 'almost' any unused virtual address to either the
> realtime
> > or normal linux task.
>
>
> It can do what you want. See "man mmap" and look at the MAP_FIXED and
> MAP_SHARED. Note the verbage "start must be a multiple of the page-size."
> The program will not work unless the address you request is on a page
> boundary, and will core-dump with a page fault.
>
> -Wayne
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