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SubjectRe: x86 setup code rewrite in C
H. Peter Anvin wrote:
> This patch set replaces the x86 setup code, which is currently all in
> assembly, with a version written in C, using the ".code16gcc" feature
> of binutils (which has been present since at least 2001.)
> The new code is vastly easier to read, and, I hope, debug. It should
> be noted that I found a fair number of minor bugs while going through
> this code, and have attempted to correct them.
> In the process of doing so, it introduces several cleanups, in
> particular:
> - Obsoletes the hd_info field in the boot_params structure; they are
> only ever used for ST-506 (pre-IDE) drives and are pretty much
> guaranteed to be wrong on current BIOSes;
> - Unifies the CPU feature bits between i386 and x86-64. In the
> future, it should be possible to use arch/i386/boot/cpucheck.c to do
> the post-invocation CPU check currently done in
> arch/x86_64/kernel/trampoline.S, although this patch set doesn't
> introduce that change.
> - boot_params is now a proper structure.
> This code has been tested in -mm since early in the 2.6.22 cycle.

This stuff is good. I haven't read through this series in detail, but I
have been working on the code in -mm and its a clear improvement.

Acked-by: Jeremy Fitzhardinge <>

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