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* x86: boot: stub out unimplemented CPU feature wordsH. Peter Anvin2008-09-051-4/+4
| | | | | | | | | | | | The CPU feature detection code in the boot code is somewhat minimal, and doesn't include all possible CPUID words. In particular, it doesn't contain the code for CPU feature words 2 (Transmeta), 3 (Linux-specific), 5 (VIA), or 7 (scattered). Zero them out, so we can still set those bits as known at compile time; in particular, this allows creating a Linux-specific NOPL flag and have it required (and therefore resolvable at compile time) in 64-bit mode. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
* x86: cleanup for setup code crashes during IST probeH. Peter Anvin2008-08-141-2/+0
| | | | | | | | Clean up the code for crashes during SpeedStep probing on older machines. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: fix setup code crashes on my old 486 boxJoerg Roedel2008-08-131-7/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | yesterday I tried to reactivate my old 486 box and wanted to install a current Linux with latest kernel on it. But it turned out that the latest kernel does not boot because the machine crashes early in the setup code. After some debugging it turned out that the problem is the query_ist() function. If this interrupt with that function is called the machine simply locks up. It looks like a BIOS bug. Looking for a workaround for this problem I wrote the attached patch. It checks for the CPUID instruction and if it is not implemented it does not call the speedstep BIOS function. As far as I know speedstep should be available since some Pentium earliest. Alan Cox observed that it's available since the Pentium II, so cpuid levels 4 and 5 can be excluded altogether. H. Peter Anvin cleaned up the code some more: > Right in concept, but I dislike the implementation (duplication of the > CPU detect code we already have). Could you try this patch and see if > it works for you? which, with a small modification to fix a build error with it the resulting kernel boots on my machine. Signed-off-by: Joerg Roedel <joro@8bytes.org> Signed-off-by: "H. Peter Anvin" <hpa@zytor.com> Cc: <stable@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: remove pointless commentsWANG Cong2008-04-191-2/+0
| | | | | | | | | Remove old comments that include the old arch/i386 directory. Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: coding style fixes to arch/x86/boot/cpucheck.cPaolo Ciarrocchi2008-04-171-10/+10
| | | | | | | | | | | | | | | | | | | | | | Before: total: 30 errors, 0 warnings, 262 lines checked After: total: 0 errors, 0 warnings, 262 lines checked No code changed: arch/x86/boot/cpucheck.o: text data bss dec hex filename 989 0 96 1085 43d cpucheck.o.before 989 0 96 1085 43d cpucheck.o.after md5: 06634cfefb8438fa284ff903b4cafbce cpucheck.o.before.asm 06634cfefb8438fa284ff903b4cafbce cpucheck.o.after.asm Signed-off-by: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: arch/x86/Kconfig.cpu unificationSam Ravnborg2007-11-121-6/+0
| | | | | | | | | | | | | | | Move all CPU definitions to Kconfig.cpu Always define X86_MINIMUM_CPU_FAMILY and do the obvious code cleanup in boot/cpucheck.c Comments from: Adrian Bunk <bunk@kernel.org> incorporated. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Cc: Adrian Bunk <bunk@kernel.org> Cc: Brian Gerst <bgerst@didntduck.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com>
* i386: move bootThomas Gleixner2007-10-111-0/+268
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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