Message	SHA1
x86: don't use large pages to map the first 2/4MB of memory ... Intel recommends to not use large pages for the first 1MB of the physical memory because there are fixed size MTRRs there which cause splitups in the TLBs. On AMD doing so is also a good idea. The implementation is a little different between 32bit and 64bit. On 32bit I just taught the initial page table set up about this because it was very simple to do. This also has the advantage that the risk of a prefetch ever seeing the page even if it only exists for a short time is minimized. On 64bit that is not quite possible, so use set_memory_4k() a little later (in check_bugs) instead. Signed-off-by: Andi Kleen <ak@suse.de> Acked-by: andreas.herrmann3@amd.com Cc: mingo@elte.hu Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Andi Kleen   authored and   Ingo Molnar   commited 2008-04-17 17:41:30 +02:00	f5c24a7fd0
x86: use identify_boot_cpu ... Call this function instead of identify_cpu in bugs_64.c Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Glauber de Oliveira Costa   authored and   Ingo Molnar   commited 2008-04-17 17:40:59 +02:00	5745abfe86
x86, 32-bit: trim memory not covered by wb mtrrs ... On some machines, buggy BIOSes don't properly setup WB MTRRs to cover all available RAM, meaning the last few megs (or even gigs) of memory will be marked uncached. Since Linux tends to allocate from high memory addresses first, this causes the machine to be unusably slow as soon as the kernel starts really using memory (i.e. right around init time). This patch works around the problem by scanning the MTRRs at boot and figuring out whether the current end_pfn value (setup by early e820 code) goes beyond the highest WB MTRR range, and if so, trimming it to match. A fairly obnoxious KERN_WARNING is printed too, letting the user know that not all of their memory is available due to a likely BIOS bug. Something similar could be done on i386 if needed, but the boot ordering would be slightly different, since the MTRR code on i386 depends on the boot_cpu_data structure being setup. This patch fixes a bug in the last patch that caused the code to run on non-Intel machines (AMD machines apparently don't need it and it's untested on other non-Intel machines, so best keep it off). Further enhancements and fixes from: Yinghai Lu <Yinghai.Lu@Sun.COM> Andi Kleen <ak@suse.de> Signed-off-by: Jesse Barnes <jesse.barnes@intel.com> Tested-by: Justin Piszcz <jpiszcz@lucidpixels.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Jesse Barnes   authored and   Ingo Molnar   commited 2008-01-30 13:33:18 +01:00	99fc8d424b
Delete filenames in comments. ... Since the x86 merge, lots of files that referenced their own filenames are no longer correct. Rather than keep them up to date, just delete them, as they add no real value. Additionally: - fix up comment formatting in scx200_32.c - Remove a credit from myself in setup_64.c from a time when we had no SCM - remove longwinded history from tsc_32.c which can be figured out from git. Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Dave Jones   authored and   Linus Torvalds   commited 2007-10-13 10:01:23 -07:00	835c34a168
x86_64: move kernel ... Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Thomas Gleixner   commited 2007-10-11 11:17:24 +02:00	250c22777f

Renamed from arch/x86_64/kernel/bugs_64.c (Browse further)