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Date: Mon, 9 Jul 2007 19:51:39 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, andi@...stfloor.org, akpm@...ux-foundation.org Subject: x86 setup code rewrite in C 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(-) - 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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