556 строки
14 KiB
C
556 строки
14 KiB
C
#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/bitops.h>
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#include <linux/smp.h>
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#include <linux/sched.h>
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#include <linux/thread_info.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <asm/processor.h>
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#include <asm/pgtable.h>
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#include <asm/msr.h>
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#include <asm/bugs.h>
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#include <asm/cpu.h>
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#ifdef CONFIG_X86_64
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#include <linux/topology.h>
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#include <asm/numa_64.h>
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#endif
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#include "cpu.h"
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#ifdef CONFIG_X86_LOCAL_APIC
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#include <asm/mpspec.h>
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#include <asm/apic.h>
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#endif
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static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
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{
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u64 misc_enable;
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/* Unmask CPUID levels if masked: */
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if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
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rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
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if (misc_enable & MSR_IA32_MISC_ENABLE_LIMIT_CPUID) {
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misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID;
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wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
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c->cpuid_level = cpuid_eax(0);
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get_cpu_cap(c);
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}
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}
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if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
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(c->x86 == 0x6 && c->x86_model >= 0x0e))
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set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
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if (c->x86 >= 6 && !cpu_has(c, X86_FEATURE_IA64)) {
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unsigned lower_word;
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wrmsr(MSR_IA32_UCODE_REV, 0, 0);
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/* Required by the SDM */
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sync_core();
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rdmsr(MSR_IA32_UCODE_REV, lower_word, c->microcode);
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}
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/*
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* Atom erratum AAE44/AAF40/AAG38/AAH41:
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*
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* A race condition between speculative fetches and invalidating
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* a large page. This is worked around in microcode, but we
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* need the microcode to have already been loaded... so if it is
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* not, recommend a BIOS update and disable large pages.
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*/
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if (c->x86 == 6 && c->x86_model == 0x1c && c->x86_mask <= 2 &&
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c->microcode < 0x20e) {
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printk(KERN_WARNING "Atom PSE erratum detected, BIOS microcode update recommended\n");
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clear_cpu_cap(c, X86_FEATURE_PSE);
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}
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#ifdef CONFIG_X86_64
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set_cpu_cap(c, X86_FEATURE_SYSENTER32);
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#else
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/* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
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if (c->x86 == 15 && c->x86_cache_alignment == 64)
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c->x86_cache_alignment = 128;
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#endif
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/* CPUID workaround for 0F33/0F34 CPU */
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if (c->x86 == 0xF && c->x86_model == 0x3
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&& (c->x86_mask == 0x3 || c->x86_mask == 0x4))
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c->x86_phys_bits = 36;
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/*
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* c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
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* with P/T states and does not stop in deep C-states.
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*
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* It is also reliable across cores and sockets. (but not across
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* cabinets - we turn it off in that case explicitly.)
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*/
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if (c->x86_power & (1 << 8)) {
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set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
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set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
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if (!check_tsc_unstable())
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sched_clock_stable = 1;
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}
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/*
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* There is a known erratum on Pentium III and Core Solo
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* and Core Duo CPUs.
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* " Page with PAT set to WC while associated MTRR is UC
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* may consolidate to UC "
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* Because of this erratum, it is better to stick with
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* setting WC in MTRR rather than using PAT on these CPUs.
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*
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* Enable PAT WC only on P4, Core 2 or later CPUs.
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*/
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if (c->x86 == 6 && c->x86_model < 15)
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clear_cpu_cap(c, X86_FEATURE_PAT);
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#ifdef CONFIG_KMEMCHECK
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/*
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* P4s have a "fast strings" feature which causes single-
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* stepping REP instructions to only generate a #DB on
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* cache-line boundaries.
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*
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* Ingo Molnar reported a Pentium D (model 6) and a Xeon
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* (model 2) with the same problem.
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*/
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if (c->x86 == 15) {
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rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
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if (misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING) {
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printk(KERN_INFO "kmemcheck: Disabling fast string operations\n");
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misc_enable &= ~MSR_IA32_MISC_ENABLE_FAST_STRING;
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wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
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}
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}
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#endif
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/*
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* If fast string is not enabled in IA32_MISC_ENABLE for any reason,
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* clear the fast string and enhanced fast string CPU capabilities.
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*/
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if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
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rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
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if (!(misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING)) {
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printk(KERN_INFO "Disabled fast string operations\n");
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setup_clear_cpu_cap(X86_FEATURE_REP_GOOD);
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setup_clear_cpu_cap(X86_FEATURE_ERMS);
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}
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}
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}
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#ifdef CONFIG_X86_32
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/*
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* Early probe support logic for ppro memory erratum #50
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*
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* This is called before we do cpu ident work
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*/
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int __cpuinit ppro_with_ram_bug(void)
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{
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/* Uses data from early_cpu_detect now */
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if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
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boot_cpu_data.x86 == 6 &&
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boot_cpu_data.x86_model == 1 &&
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boot_cpu_data.x86_mask < 8) {
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printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
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return 1;
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}
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return 0;
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}
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#ifdef CONFIG_X86_F00F_BUG
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static void __cpuinit trap_init_f00f_bug(void)
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{
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__set_fixmap(FIX_F00F_IDT, __pa(&idt_table), PAGE_KERNEL_RO);
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/*
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* Update the IDT descriptor and reload the IDT so that
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* it uses the read-only mapped virtual address.
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*/
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idt_descr.address = fix_to_virt(FIX_F00F_IDT);
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load_idt(&idt_descr);
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}
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#endif
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static void __cpuinit intel_smp_check(struct cpuinfo_x86 *c)
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{
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/* calling is from identify_secondary_cpu() ? */
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if (!c->cpu_index)
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return;
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/*
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* Mask B, Pentium, but not Pentium MMX
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*/
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if (c->x86 == 5 &&
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c->x86_mask >= 1 && c->x86_mask <= 4 &&
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c->x86_model <= 3) {
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/*
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* Remember we have B step Pentia with bugs
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*/
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WARN_ONCE(1, "WARNING: SMP operation may be unreliable"
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"with B stepping processors.\n");
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}
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}
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static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
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{
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unsigned long lo, hi;
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#ifdef CONFIG_X86_F00F_BUG
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/*
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* All current models of Pentium and Pentium with MMX technology CPUs
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* have the F0 0F bug, which lets nonprivileged users lock up the
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* system.
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* Note that the workaround only should be initialized once...
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*/
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c->f00f_bug = 0;
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if (!paravirt_enabled() && c->x86 == 5) {
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static int f00f_workaround_enabled;
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c->f00f_bug = 1;
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if (!f00f_workaround_enabled) {
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trap_init_f00f_bug();
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printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
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f00f_workaround_enabled = 1;
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}
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}
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#endif
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/*
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* SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
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* model 3 mask 3
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*/
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if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
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clear_cpu_cap(c, X86_FEATURE_SEP);
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/*
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* P4 Xeon errata 037 workaround.
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* Hardware prefetcher may cause stale data to be loaded into the cache.
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*/
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if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
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rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
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if ((lo & MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE) == 0) {
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printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
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printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
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lo |= MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE;
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wrmsr(MSR_IA32_MISC_ENABLE, lo, hi);
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}
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}
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/*
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* See if we have a good local APIC by checking for buggy Pentia,
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* i.e. all B steppings and the C2 stepping of P54C when using their
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* integrated APIC (see 11AP erratum in "Pentium Processor
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* Specification Update").
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*/
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if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
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(c->x86_mask < 0x6 || c->x86_mask == 0xb))
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set_cpu_cap(c, X86_FEATURE_11AP);
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#ifdef CONFIG_X86_INTEL_USERCOPY
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/*
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* Set up the preferred alignment for movsl bulk memory moves
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*/
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switch (c->x86) {
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case 4: /* 486: untested */
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break;
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case 5: /* Old Pentia: untested */
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break;
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case 6: /* PII/PIII only like movsl with 8-byte alignment */
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movsl_mask.mask = 7;
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break;
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case 15: /* P4 is OK down to 8-byte alignment */
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movsl_mask.mask = 7;
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break;
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}
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#endif
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#ifdef CONFIG_X86_NUMAQ
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numaq_tsc_disable();
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#endif
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intel_smp_check(c);
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}
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#else
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static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
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{
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}
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#endif
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static void __cpuinit srat_detect_node(struct cpuinfo_x86 *c)
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{
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#ifdef CONFIG_NUMA
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unsigned node;
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int cpu = smp_processor_id();
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/* Don't do the funky fallback heuristics the AMD version employs
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for now. */
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node = numa_cpu_node(cpu);
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if (node == NUMA_NO_NODE || !node_online(node)) {
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/* reuse the value from init_cpu_to_node() */
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node = cpu_to_node(cpu);
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}
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numa_set_node(cpu, node);
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#endif
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}
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/*
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* find out the number of processor cores on the die
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*/
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static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
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{
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unsigned int eax, ebx, ecx, edx;
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if (c->cpuid_level < 4)
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return 1;
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/* Intel has a non-standard dependency on %ecx for this CPUID level. */
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cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
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if (eax & 0x1f)
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return (eax >> 26) + 1;
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else
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return 1;
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}
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static void __cpuinit detect_vmx_virtcap(struct cpuinfo_x86 *c)
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{
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/* Intel VMX MSR indicated features */
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#define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
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#define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
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#define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
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#define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
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#define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
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#define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
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u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
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clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
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clear_cpu_cap(c, X86_FEATURE_VNMI);
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clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
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clear_cpu_cap(c, X86_FEATURE_EPT);
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clear_cpu_cap(c, X86_FEATURE_VPID);
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rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
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msr_ctl = vmx_msr_high | vmx_msr_low;
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if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)
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set_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
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if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI)
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set_cpu_cap(c, X86_FEATURE_VNMI);
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if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) {
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rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
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vmx_msr_low, vmx_msr_high);
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msr_ctl2 = vmx_msr_high | vmx_msr_low;
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if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) &&
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(msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW))
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set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
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if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT)
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set_cpu_cap(c, X86_FEATURE_EPT);
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if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
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set_cpu_cap(c, X86_FEATURE_VPID);
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}
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}
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static void __cpuinit init_intel(struct cpuinfo_x86 *c)
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{
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unsigned int l2 = 0;
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early_init_intel(c);
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intel_workarounds(c);
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/*
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* Detect the extended topology information if available. This
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* will reinitialise the initial_apicid which will be used
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* in init_intel_cacheinfo()
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*/
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detect_extended_topology(c);
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l2 = init_intel_cacheinfo(c);
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if (c->cpuid_level > 9) {
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unsigned eax = cpuid_eax(10);
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/* Check for version and the number of counters */
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if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
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set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
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}
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if (cpu_has_xmm2)
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set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
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if (cpu_has_ds) {
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unsigned int l1;
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rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
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if (!(l1 & (1<<11)))
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set_cpu_cap(c, X86_FEATURE_BTS);
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if (!(l1 & (1<<12)))
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set_cpu_cap(c, X86_FEATURE_PEBS);
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}
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if (c->x86 == 6 && c->x86_model == 29 && cpu_has_clflush)
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set_cpu_cap(c, X86_FEATURE_CLFLUSH_MONITOR);
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#ifdef CONFIG_X86_64
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if (c->x86 == 15)
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c->x86_cache_alignment = c->x86_clflush_size * 2;
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if (c->x86 == 6)
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set_cpu_cap(c, X86_FEATURE_REP_GOOD);
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#else
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/*
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* Names for the Pentium II/Celeron processors
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* detectable only by also checking the cache size.
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* Dixon is NOT a Celeron.
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*/
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if (c->x86 == 6) {
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char *p = NULL;
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switch (c->x86_model) {
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case 5:
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if (l2 == 0)
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p = "Celeron (Covington)";
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else if (l2 == 256)
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p = "Mobile Pentium II (Dixon)";
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break;
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case 6:
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if (l2 == 128)
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p = "Celeron (Mendocino)";
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else if (c->x86_mask == 0 || c->x86_mask == 5)
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p = "Celeron-A";
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break;
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case 8:
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if (l2 == 128)
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p = "Celeron (Coppermine)";
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break;
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}
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if (p)
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strcpy(c->x86_model_id, p);
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}
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if (c->x86 == 15)
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set_cpu_cap(c, X86_FEATURE_P4);
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if (c->x86 == 6)
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set_cpu_cap(c, X86_FEATURE_P3);
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#endif
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if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
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/*
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* let's use the legacy cpuid vector 0x1 and 0x4 for topology
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* detection.
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*/
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c->x86_max_cores = intel_num_cpu_cores(c);
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#ifdef CONFIG_X86_32
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detect_ht(c);
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#endif
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}
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/* Work around errata */
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srat_detect_node(c);
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if (cpu_has(c, X86_FEATURE_VMX))
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detect_vmx_virtcap(c);
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/*
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* Initialize MSR_IA32_ENERGY_PERF_BIAS if BIOS did not.
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* x86_energy_perf_policy(8) is available to change it at run-time
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*/
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if (cpu_has(c, X86_FEATURE_EPB)) {
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u64 epb;
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rdmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
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if ((epb & 0xF) == ENERGY_PERF_BIAS_PERFORMANCE) {
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printk_once(KERN_WARNING "ENERGY_PERF_BIAS:"
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" Set to 'normal', was 'performance'\n"
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"ENERGY_PERF_BIAS: View and update with"
|
|
" x86_energy_perf_policy(8)\n");
|
|
epb = (epb & ~0xF) | ENERGY_PERF_BIAS_NORMAL;
|
|
wrmsrl(MSR_IA32_ENERGY_PERF_BIAS, epb);
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
|
|
{
|
|
/*
|
|
* Intel PIII Tualatin. This comes in two flavours.
|
|
* One has 256kb of cache, the other 512. We have no way
|
|
* to determine which, so we use a boottime override
|
|
* for the 512kb model, and assume 256 otherwise.
|
|
*/
|
|
if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
|
|
size = 256;
|
|
return size;
|
|
}
|
|
#endif
|
|
|
|
static const struct cpu_dev __cpuinitconst intel_cpu_dev = {
|
|
.c_vendor = "Intel",
|
|
.c_ident = { "GenuineIntel" },
|
|
#ifdef CONFIG_X86_32
|
|
.c_models = {
|
|
{ .vendor = X86_VENDOR_INTEL, .family = 4, .model_names =
|
|
{
|
|
[0] = "486 DX-25/33",
|
|
[1] = "486 DX-50",
|
|
[2] = "486 SX",
|
|
[3] = "486 DX/2",
|
|
[4] = "486 SL",
|
|
[5] = "486 SX/2",
|
|
[7] = "486 DX/2-WB",
|
|
[8] = "486 DX/4",
|
|
[9] = "486 DX/4-WB"
|
|
}
|
|
},
|
|
{ .vendor = X86_VENDOR_INTEL, .family = 5, .model_names =
|
|
{
|
|
[0] = "Pentium 60/66 A-step",
|
|
[1] = "Pentium 60/66",
|
|
[2] = "Pentium 75 - 200",
|
|
[3] = "OverDrive PODP5V83",
|
|
[4] = "Pentium MMX",
|
|
[7] = "Mobile Pentium 75 - 200",
|
|
[8] = "Mobile Pentium MMX"
|
|
}
|
|
},
|
|
{ .vendor = X86_VENDOR_INTEL, .family = 6, .model_names =
|
|
{
|
|
[0] = "Pentium Pro A-step",
|
|
[1] = "Pentium Pro",
|
|
[3] = "Pentium II (Klamath)",
|
|
[4] = "Pentium II (Deschutes)",
|
|
[5] = "Pentium II (Deschutes)",
|
|
[6] = "Mobile Pentium II",
|
|
[7] = "Pentium III (Katmai)",
|
|
[8] = "Pentium III (Coppermine)",
|
|
[10] = "Pentium III (Cascades)",
|
|
[11] = "Pentium III (Tualatin)",
|
|
}
|
|
},
|
|
{ .vendor = X86_VENDOR_INTEL, .family = 15, .model_names =
|
|
{
|
|
[0] = "Pentium 4 (Unknown)",
|
|
[1] = "Pentium 4 (Willamette)",
|
|
[2] = "Pentium 4 (Northwood)",
|
|
[4] = "Pentium 4 (Foster)",
|
|
[5] = "Pentium 4 (Foster)",
|
|
}
|
|
},
|
|
},
|
|
.c_size_cache = intel_size_cache,
|
|
#endif
|
|
.c_early_init = early_init_intel,
|
|
.c_init = init_intel,
|
|
.c_x86_vendor = X86_VENDOR_INTEL,
|
|
};
|
|
|
|
cpu_dev_register(intel_cpu_dev);
|
|
|