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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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