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Date: Fri, 01 Jun 2007 14:57:10 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Jeremy Fitzhardinge <jeremy@...p.org> CC: "Eric W. Biederman" <ebiederm@...ssion.com>, Rusty Russell <rusty@...tcorp.com.au>, Chris Wright <chrisw@...s-sol.org>, Virtualization Mailing List <virtualization@...ts.osdl.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: Extending boot protocol & bzImage for paravirt_ops Jeremy Fitzhardinge wrote: > H. Peter Anvin wrote: >>> Do we care particularly? If 8 bytes is enough for the subarch, do we >>> care whether its a pointer or literal? After all, this is just a private >>> channel between the bootloader and some subarch-specific piece of code >>> in the kernel. >>> >>> >> I see two options: either we make it a pointer *and a length* so that a >> loader can reshuffle it at will (that also implies no absolute pointers >> within the data), or it's an opaque cookie anyway. > > No, it has to be completely opaque. It might be a pointer to some > special shared memory or something, and not movable. > Well, if we define is as a movable object then it has to be treated as such. It's a protocol definition issue. If we define it opaque, though -- of for that matter, if we don't -- we should define what memory it can live in, though. Right now, the only "available" memory we have is end of setup to 0xa0000; the command line is defined to be allocated from this memory. -hpa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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