Messages in this thread Patch in this message | | | Date | Tue, 22 Nov 2005 13:08:38 -0800 | From | Chris Wright <> | Subject | [patch 19/23] [PATCH] x86_64/i386: Compute correct MTRR mask on early Noconas |
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-stable review patch. If anyone has any objections, please let us know. ------------------
Force correct address space size for MTRR on some 64bit Intel Xeons
They report 40bit, but only have 36bits of physical address space. This caused problems with setting up the correct masks for MTRR, resulting in incorrect MTRRs.
CPUID workaround for steppings 0F33h(supporting x86) and 0F34h(supporting x86 and EM64T). Detail info can be found at: http://download.intel.com/design/Xeon/specupdt/30240216.pdf http://download.intel.com/design/Pentium4/specupdt/30235221.pdf
Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- arch/i386/kernel/cpu/mtrr/main.c | 8 ++++++++ arch/x86_64/kernel/setup.c | 5 +++++ 2 files changed, 13 insertions(+)
--- linux-2.6.14.2.orig/arch/i386/kernel/cpu/mtrr/main.c +++ linux-2.6.14.2/arch/i386/kernel/cpu/mtrr/main.c @@ -626,6 +626,14 @@ void __init mtrr_bp_init(void) if (cpuid_eax(0x80000000) >= 0x80000008) { u32 phys_addr; phys_addr = cpuid_eax(0x80000008) & 0xff; + /* CPUID workaround for Intel 0F33/0F34 CPU */ + if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && + boot_cpu_data.x86 == 0xF && + boot_cpu_data.x86_model == 0x3 && + (boot_cpu_data.x86_mask == 0x3 || + boot_cpu_data.x86_mask == 0x4)) + phys_addr = 36; + size_or_mask = ~((1 << (phys_addr - PAGE_SHIFT)) - 1); size_and_mask = ~size_or_mask & 0xfff00000; } else if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR && --- linux-2.6.14.2.orig/arch/x86_64/kernel/setup.c +++ linux-2.6.14.2/arch/x86_64/kernel/setup.c @@ -993,6 +993,11 @@ static void __cpuinit init_intel(struct unsigned eax = cpuid_eax(0x80000008); c->x86_virt_bits = (eax >> 8) & 0xff; c->x86_phys_bits = eax & 0xff; + /* CPUID workaround for Intel 0F34 CPU */ + if (c->x86_vendor == X86_VENDOR_INTEL && + c->x86 == 0xF && c->x86_model == 0x3 && + c->x86_mask == 0x4) + c->x86_phys_bits = 36; } if (c->x86 == 15) -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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