Date: Thu, 26 Oct 2006 15:42:34 -0400 From: John Baldwin <jhb@freebsd.org> To: Ruslan Ermilov <ru@freebsd.org> Cc: freebsd-stable@freebsd.org, Stefan Bethke <stb@lassitu.de>, Bruce Evans <bde@zeta.org.au>, Bruce Evans <bde@freebsd.org> Subject: Re: Still possible to directly boot without loader? Message-ID: <200610261542.35322.jhb@freebsd.org> In-Reply-To: <20061026191820.GB2420@rambler-co.ru> References: <3A8131D4-881E-4873-A682-543A1A88C063@lassitu.de> <200610261138.24939.jhb@freebsd.org> <20061026191820.GB2420@rambler-co.ru>
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On Thursday 26 October 2006 15:18, Ruslan Ermilov wrote:
> On Thu, Oct 26, 2006 at 11:38:24AM -0400, John Baldwin wrote:
> > On Thursday 26 October 2006 10:42, Ruslan Ermilov wrote:
> > > On Thu, Oct 26, 2006 at 10:28:09AM -0400, John Baldwin wrote:
> > > > boot2 should do whatever loader does.
> > > >
> > > But this would be a regression, since loader(8) does the following,
> > > in the ELF32 case:
> > >
> > > : 0 edoofus:ttyp2:/sys/boot/i386/libi386 >grep -w entry elf32_freebsd.c
> > > : vm_offset_t entry, bootinfop, modulep, kernend;
> > > : entry = ehdr->e_entry & 0xffffff;
> > > : printf("Start @ 0x%lx ...\n", entry);
> > > : __exec((void *)entry, boothowto, bootdev, 0, 0, 0, bootinfop, modulep, kernend);
> >
> > Ah, ok. Make them both just mask the top 8 bits then. :)
> >
> OK, I backed out your change to boot2.c.
Sorry, I meant that both boot2 and loader should follow your proposal of masking 28 bits.
Just masking the top 4 bits is probably sufficient.
--
John Baldwin
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