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Date: Mon, 9 Jul 2007 21:24:03 -0700 From: "Yinghai Lu" <yhlu.kernel@...il.com> To: "H. Peter Anvin" <hpa@...or.com> Cc: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, andi@...stfloor.org, akpm@...ux-foundation.org Subject: Re: x86 setup code rewrite in C On 7/9/07, H. Peter Anvin <hpa@...or.com> 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. > > arch/i386/boot/bootsect.S | 98 - > arch/i386/boot/edd.S | 231 -- > arch/i386/boot/setup.S | 1075 ------------- > arch/i386/boot/video.S | 2043 -------------------------- > arch/i386/kernel/verify_cpu.S | 94 - > arch/x86_64/boot/bootsect.S | 98 - > arch/x86_64/boot/install.sh | 2 > arch/x86_64/boot/mtools.conf.in | 17 > arch/x86_64/boot/setup.S | 826 ---------- > arch/x86_64/boot/tools/build.c | 185 -- > b/Documentation/i386/zero-page.txt | 1 > b/MAINTAINERS | 4 > b/arch/i386/Kconfig.cpu | 6 > b/arch/i386/boot/Makefile | 46 > b/arch/i386/boot/a20.c | 161 ++ > b/arch/i386/boot/apm.c | 97 + > b/arch/i386/boot/bitops.h | 45 > b/arch/i386/boot/boot.h | 290 +++ > b/arch/i386/boot/cmdline.c | 97 + > b/arch/i386/boot/code16gcc.h | 9 > b/arch/i386/boot/compressed/Makefile | 7 > b/arch/i386/boot/compressed/head.S | 6 > b/arch/i386/boot/copy.S | 101 + > b/arch/i386/boot/cpu.c | 69 > b/arch/i386/boot/cpucheck.c | 267 +++ > b/arch/i386/boot/edd.c | 196 ++ > b/arch/i386/boot/header.S | 283 +++ > b/arch/i386/boot/main.c | 161 ++ > b/arch/i386/boot/mca.c | 43 > b/arch/i386/boot/memory.c | 99 + > b/arch/i386/boot/pm.c | 170 ++ > b/arch/i386/boot/pmjump.S | 54 > b/arch/i386/boot/printf.c | 331 ++++ > b/arch/i386/boot/setup.ld | 54 > b/arch/i386/boot/string.c | 34 > b/arch/i386/boot/tools/build.c | 160 -- > b/arch/i386/boot/tty.c | 112 + > b/arch/i386/boot/version.c | 23 > b/arch/i386/boot/vesa.h | 79 + > b/arch/i386/boot/video-bios.c | 125 + > b/arch/i386/boot/video-vesa.c | 284 +++ > b/arch/i386/boot/video-vga.c | 260 +++ > b/arch/i386/boot/video.c | 456 +++++ > b/arch/i386/boot/video.h | 145 + > b/arch/i386/boot/voyager.c | 46 > b/arch/i386/kernel/cpu/Makefile | 2 > b/arch/i386/kernel/cpu/addon_cpuid_features.c | 50 > b/arch/i386/kernel/cpu/common.c | 2 > b/arch/i386/kernel/cpu/proc.c | 21 > b/arch/i386/kernel/e820.c | 2 > b/arch/i386/kernel/setup.c | 12 > b/arch/x86_64/Kconfig | 4 > b/arch/x86_64/boot/Makefile | 136 - > b/arch/x86_64/boot/compressed/Makefile | 9 > b/arch/x86_64/boot/compressed/head.S | 6 > b/arch/x86_64/kernel/Makefile | 2 > b/arch/x86_64/kernel/setup.c | 21 > b/arch/x86_64/kernel/verify_cpu.S | 22 > b/drivers/ide/legacy/hd.c | 73 > b/include/asm-i386/boot.h | 6 > b/include/asm-i386/bootparam.h | 85 + > b/include/asm-i386/cpufeature.h | 26 > b/include/asm-i386/e820.h | 14 > b/include/asm-i386/processor.h | 1 > b/include/asm-i386/required-features.h | 39 > b/include/asm-i386/setup.h | 10 > b/include/asm-x86_64/alternative.h | 68 > b/include/asm-x86_64/boot.h | 16 > b/include/asm-x86_64/bootparam.h | 1 > b/include/asm-x86_64/cpufeature.h | 115 - > b/include/asm-x86_64/e820.h | 6 > b/include/asm-x86_64/processor.h | 3 > b/include/asm-x86_64/required-features.h | 46 > b/include/asm-x86_64/segment.h | 8 > b/include/linux/edd.h | 4 > b/include/linux/screen_info.h | 9 > 76 files changed, 4601 insertions(+), 5208 deletions(-) is possible to put 16bit c in seperate directory. or rename them with _16.c? YH - 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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