Date: Wed, 13 Dec 2000 00:28:24 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Alfred Perlstein <bright@wintelcom.net> Cc: Mike Smith <msmith@FreeBSD.ORG>, arch@FreeBSD.ORG Subject: Re: Proposed bus address typedef. Message-ID: <200012130828.eBD8SOT81109@earth.backplane.com> References: <200012130730.eBD7UV307046@mass.osd.bsdi.com> <20001212232457.X16205@fw.wintelcom.net>
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I'd prefer it not be a compile-time option. The code is
complicated enough already. Pointers on IA32 are still
32 bits... just 32 bits per address space. So there is no particular
need for them to be visible outside the device driver core. Most of
the rest of the kernel that accesses a physical address could just as
well use a page index rather then an actual address. A page index still
fits in an int (i.e. vm_page_t->phys_addr could easily become a page
index, or could become a machine-dependant MMU compatible value if not
a page index). Most of the rest of the kernel either uses virtual
addresses, which are still 32 bits, or block numbers. If the change can
be made without impacting the size of heavily used system structures
I'm all for it.
-Matt
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