Date: Tue, 14 Jul 1998 17:11:42 -0700 From: David Greenman <dg@root.com> To: Luoqi Chen <luoqi@watermarkgroup.com> Cc: bf20761@binghamton.edu, freebsd-hackers@FreeBSD.ORG Subject: Re: Wrong comment in pmap_bootstrap() about virtual_avail? Message-ID: <199807150011.RAA24922@implode.root.com> In-Reply-To: Your message of "Tue, 14 Jul 1998 18:59:52 EDT." <199807142259.SAA28732@lor.watermarkgroup.com>
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>> In file i386/pmap.c, routine pmap_bootstrap(), I find the following >> comment: >> >> "XXX The calculation of virtual_avail is wrong. It's NKPT*PAGE_SIZE too >> large. It should be instead be correctly calculated in locore.s and not >> based on 'first'(which is a physical address, not a virtual address, for >> the start of unused physical memory)..." I wrote the comment. The word "wrong" above doesn't mean that it is wrong in the sense that there is a bug in the code. It means only that, from an architectural perspective, it should represent the actual start of the kernel VM (after the kernel text/data/bss), and instead means something slightly different. I can't help but wonder why you are looking at this code fragment...it is highly esoteric for most anyone who intends to do development in the FreeBSD kernel. -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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