Messages in this thread | | | Date | Fri, 04 May 2007 10:13:15 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [RFC PATCH 1/3] Replace paravirt_probe with "platform type" boot header field |
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Eric W. Biederman wrote: > "H. Peter Anvin" <hpa@zytor.com> writes: > >> Eric W. Biederman wrote: >>> Unlikely. Unless we expect that this offset will come in non-zero. >>> >> You might have to worry about that. Historically, the "zero-page" was >> really just the setup code overwritten, and it's still true for a big >> chunk of it. >> >> One of the major changes in my setup code rewrite is to start out with >> an all-zero chunk of memory for this. > > Well as long as we are in sync with setup.S we are fine. The issue > is people generating the real-mode data from scratch, when using the > 32bit entry point.
Point. I'd like that interface to specify that any undefined fields should be zero, or we have a hopeless situation on our hands.
By the way, see the following for the structure definition; prepare to barf:
http://git.kernel.org/?p=linux/kernel/git/hpa/linux-2.6-newsetup.git;a=blob;f=arch/i386/boot/boot.h;h=41a16f96ac3476cbd969aabe5e6a792ffe8c64a0;hb=HEAD
[I intend to move this into include/asm-i386/boot.h, but haven't gotten that far yet. I just yesterday got the code booting on both i386 and x86-64, but haven't committed all the include/asm-* mods that went a long with that yet. I'm also waiting for a Kbuild fix so that the boot directory can be shared between i386 and x86-64 without requiring a symlink in the source tarball.]
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