Date: Mon, 06 Oct 2003 08:56:45 -0700 From: Peter Wemm <peter@wemm.org> To: John Baldwin <jhb@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/conf ldscript.i386 src/sys/i386/i386 bios.c genassym.c locore.s machdep.c mp_machdep.c mpboot.s pmap.c src/sys/i386/include pmap.h vmparam.h Message-ID: <20031006155645.19D392A8DD@canning.wemm.org> In-Reply-To: <XFMail.20031006111341.jhb@FreeBSD.org>
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John Baldwin wrote: > > On 04-Oct-2003 Peter Wemm wrote: > > John Baldwin wrote: > > > >> On 01-Oct-2003 Peter Wemm wrote: > >> > peter 2003/10/01 16:46:08 PDT > > > >> > Log: > >> > Commit Bosko's patch to clean up the PSE/PG_G initialization to and > >> > avoid problems with some Pentium 4 cpus and some older PPro/Pentium2 > >> > cpus. There are several problems, some documented in Intel errata. > > > >> What does KERNBASE map to now? 4mb? > > > > Nope. KERNBASE is unchanged. What is different now is that the fixed 1MB > > offset (pa = 1MB, va = KERNBASE + 1mb) is now 4MB and available via the > > KERNLOAD variable. This becomes 2MB on a PAE configuration kernel. > > So does KERNBASE + foo still map to PA foo for the lower 1 meg? Yes, but the RAM part is readonly. The isa hole and any ram->640K hole and address zero is read/write. There are no devices under the ram section though, so the pmap_mapdev() tweaks for the first 1MB should be ok still. Cheers, -Peter -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com "All of this is for nothing if we don't go to the stars" - JMS/B5
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