Date: Sat, 18 Sep 2004 16:59:48 -0400 From: John Baldwin <jhb@FreeBSD.org> To: "Poul-Henning Kamp" <phk@phk.freebsd.dk> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/boot/i386/boot2 boot2.c Message-ID: <200409181659.48310.jhb@FreeBSD.org> In-Reply-To: <1860.1095491285@critter.freebsd.dk> References: <1860.1095491285@critter.freebsd.dk>
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On Saturday 18 September 2004 03:08 am, Poul-Henning Kamp wrote: > In message <200409180207.i8I27044010045@repoman.freebsd.org>, John Baldwin > writ > > es: > >jhb 2004-09-18 02:07:00 UTC > > > > FreeBSD src repository > > > > Modified files: > > sys/boot/i386/boot2 boot2.c > > Log: > > A long, long time ago in a CVS branch far away (specifically, HEAD prior > > to 4.0 and RELENG_3), the BTX mini-kernel used paging rather than flat > > mode and clients were limited to a virtual address space of 16 > > megabytes. Because of this limitation, boot2 silently masked all physical > > addresses in any binaries it loaded so that they were always loaded into > > the first 16 Meg. Since BTX no longer has this limitation (and hasn't > > for a long time), remove the masking from boot2. This allows boot2 to > > load kernels larger than about 12 to 14 meg (12 for non-PAE, 14 for PAE). > > Does this also give us better space for isa_dma bounce buffers ? Err, I don't see how it could. This only affects how boot2 handles addresses in the executables it loads, it doesn't affect how the kernel manages memory at all. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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