| Date | Tue, 10 Jul 2007 09:24:52 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: x86 setup code rewrite in C |
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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 <jeremy@xensource.com>
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