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To: Stefan Esser <se@freefall.freebsd.org>
cc: CVS-commiters@freefall.freebsd.org, cvs-sys@freefall.freebsd.org
Subject: Re: cvs commit: src/sys/pci ncr.c 
In-reply-to: Your message of "Tue, 05 Sep 95 15:38:02 PDT."
             <199509052238.PAA09382@freefall.freebsd.org> 
From: David Greenman <davidg@Root.COM>
Reply-To: davidg@Root.COM
Date: Tue, 05 Sep 1995 15:59:38 -0700
Sender: commit-owner@FreeBSD.org
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>se          95/09/05 15:38:02
>
>  Modified:    sys/pci   ncr.c
>  Log:
>  The NCR script has grown beyond one page (4KB). Since malloc() returns
>  contiguous memory in virtual space, but doesn't guarantee any particular
>  physical layout of pages, the script may be not contguous in physical
>  memory. This made the first write command fail in very rare cases.
>  This has been fixed by checking the region returned by malloc() for
>  being contiguous, but there should be a physical memory allocate
>  and later mapping to virtual memory instead.
>  
>  A few assertions and error messages are improved.

   I wrote a routine specifically for allocating physically contiguous memory.
Take a look at vm_page_alloc_contig() in vm/vm_page.c.

-DG