From owner-freebsd-hackers Tue Oct 9 18: 8:57 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from alicia.nttmcl.com (alicia.nttmcl.com [216.69.69.10]) by hub.freebsd.org (Postfix) with ESMTP id 4DE2A37B406 for ; Tue, 9 Oct 2001 18:08:54 -0700 (PDT) Received: (from gene@localhost) by alicia.nttmcl.com (8.10.1/8.10.1) id f9A18f426478; Tue, 9 Oct 2001 18:08:41 -0700 (PDT) Date: Tue, 9 Oct 2001 18:08:41 -0700 From: "Eugene M. Kim" To: Jonathan Lemon Cc: hackers@freebsd.org Subject: Re: VM question (I hate Intel 810/815 chipsets...) Message-ID: <20011009180841.A26019@alicia.nttmcl.com> References: <200110100037.f9A0bfv40852@prism.flugsvamp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2i In-Reply-To: <200110100037.f9A0bfv40852@prism.flugsvamp.com>; from jlemon@flugsvamp.com on Tue, Oct 09, 2001 at 07:37:41PM -0500 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Thank you for the reply. I also found contigmalloc() shortly after I posted the original question (what an embarrassment ;-p), then met another restriction: Because these memory regions are to be accessed by a userland process (X server), they have to be somehow mapped into the user space. So far it seems I would have to do something similar to vm_mmap(), but I'm not sure if this is a right direction. Do you have any suggestions? Cheers, Eugene On Tue, Oct 09, 2001 at 07:37:41PM -0500, Jonathan Lemon wrote: > > > In article you write: > >What would be the best way to allocate: > > > >1) a VM page whose physical address falls within a certain boundary, and > >2) a VM object whose pages are contiguous in physical address space? > > > >Background: > >The !@*%^*!&#^%*&!#^$!@ Intel 810/815 graphics controller requires its > >instruction and hardware cursor buffers to reside within first 32MB and > >512MB of *physical* memory space respectively. :( :( ;( The XFree86 > >driver assumes the Linux memory model (virtual addr == physical addr), > >so it runs on Linux, but not always on FreeBSD. > > You probably want contigmalloc(), which allocates a range of memory > which is physically contiguous. (assuming this is a in-kernel driver) > > void * > contigmalloc( > unsigned long size, /* should be size_t here and for malloc() */ > struct malloc_type *type, > int flags, > unsigned long low, > unsigned long high, > unsigned long alignment, > unsigned long boundary) > > -- > Jonathan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message