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Diffstat (limited to 'arch/x86/kernel/cpu/intel_64.c')
-rw-r--r--arch/x86/kernel/cpu/intel_64.c301
1 files changed, 284 insertions, 17 deletions
diff --git a/arch/x86/kernel/cpu/intel_64.c b/arch/x86/kernel/cpu/intel_64.c
index aef4f2826313..365a008080c2 100644
--- a/arch/x86/kernel/cpu/intel_64.c
+++ b/arch/x86/kernel/cpu/intel_64.c
@@ -1,42 +1,108 @@
#include <linux/init.h>
+#include <linux/kernel.h>
+
+#include <linux/string.h>
+#include <linux/bitops.h>
#include <linux/smp.h>
+#include <linux/thread_info.h>
+#include <linux/module.h>
+
#include <asm/processor.h>
+#include <asm/pgtable.h>
+#include <asm/msr.h>
+#include <asm/uaccess.h>
#include <asm/ptrace.h>
+#include <asm/ds.h>
+#include <asm/bugs.h>
+
+#ifdef CONFIG_X86_64
#include <asm/topology.h>
#include <asm/numa_64.h>
+#endif
#include "cpu.h"
+#ifdef CONFIG_X86_LOCAL_APIC
+#include <asm/mpspec.h>
+#include <asm/apic.h>
+#include <mach_apic.h>
+#endif
+
static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
{
if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
- (c->x86 == 0x6 && c->x86_model >= 0x0e))
+ (c->x86 == 0x6 && c->x86_model >= 0x0e))
set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
+#ifdef CONFIG_X86_64
set_cpu_cap(c, X86_FEATURE_SYSENTER32);
+#else
+ /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
+ if (c->x86 == 15 && c->x86_cache_alignment == 64)
+ c->x86_cache_alignment = 128;
+#endif
}
+#ifdef CONFIG_X86_32
/*
- * find out the number of processor cores on the die
+ * Early probe support logic for ppro memory erratum #50
+ *
+ * This is called before we do cpu ident work
*/
-static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
-{
- unsigned int eax, t;
- if (c->cpuid_level < 4)
+int __cpuinit ppro_with_ram_bug(void)
+{
+ /* Uses data from early_cpu_detect now */
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+ boot_cpu_data.x86 == 6 &&
+ boot_cpu_data.x86_model == 1 &&
+ boot_cpu_data.x86_mask < 8) {
+ printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
return 1;
+ }
+ return 0;
+}
- cpuid_count(4, 0, &eax, &t, &t, &t);
- if (eax & 0x1f)
- return ((eax >> 26) + 1);
- else
- return 1;
+/*
+ * P4 Xeon errata 037 workaround.
+ * Hardware prefetcher may cause stale data to be loaded into the cache.
+ */
+static void __cpuinit Intel_errata_workarounds(struct cpuinfo_x86 *c)
+{
+ unsigned long lo, hi;
+
+ if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
+ rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
+ if ((lo & (1<<9)) == 0) {
+ printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
+ printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
+ lo |= (1<<9); /* Disable hw prefetching */
+ wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
+ }
+ }
+}
+
+
+
+#ifdef CONFIG_X86_F00F_BUG
+static void __cpuinit trap_init_f00f_bug(void)
+{
+ __set_fixmap(FIX_F00F_IDT, __pa(&idt_table), PAGE_KERNEL_RO);
+
+ /*
+ * Update the IDT descriptor and reload the IDT so that
+ * it uses the read-only mapped virtual address.
+ */
+ idt_descr.address = fix_to_virt(FIX_F00F_IDT);
+ load_idt(&idt_descr);
}
+#endif
+#endif
static void __cpuinit srat_detect_node(void)
{
-#ifdef CONFIG_NUMA
+#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
unsigned node;
int cpu = smp_processor_id();
int apicid = hard_smp_processor_id();
@@ -52,11 +118,51 @@ static void __cpuinit srat_detect_node(void)
#endif
}
+/*
+ * find out the number of processor cores on the die
+ */
+static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
+{
+ unsigned int eax, ebx, ecx, edx;
+
+ if (c->cpuid_level < 4)
+ return 1;
+
+ /* Intel has a non-standard dependency on %ecx for this CPUID level. */
+ cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
+ if (eax & 0x1f)
+ return ((eax >> 26) + 1);
+ else
+ return 1;
+}
+
static void __cpuinit init_intel(struct cpuinfo_x86 *c)
{
+ unsigned int l2 = 0;
+ char *p = NULL;
+
early_init_intel(c);
- init_intel_cacheinfo(c);
+#ifdef CONFIG_X86_F00F_BUG
+ /*
+ * All current models of Pentium and Pentium with MMX technology CPUs
+ * have the F0 0F bug, which lets nonprivileged users lock up the system.
+ * Note that the workaround only should be initialized once...
+ */
+ c->f00f_bug = 0;
+ if (!paravirt_enabled() && c->x86 == 5) {
+ static int f00f_workaround_enabled;
+
+ c->f00f_bug = 1;
+ if (!f00f_workaround_enabled) {
+ trap_init_f00f_bug();
+ printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
+ f00f_workaround_enabled = 1;
+ }
+ }
+#endif
+
+ l2 = init_intel_cacheinfo(c);
if (c->cpuid_level > 9) {
unsigned eax = cpuid_eax(10);
/* Check for version and the number of counters */
@@ -64,8 +170,70 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
}
+#ifdef CONFIG_X86_32
+ /* SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until model 3 mask 3 */
+ if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
+ clear_cpu_cap(c, X86_FEATURE_SEP);
+
+ /*
+ * Names for the Pentium II/Celeron processors
+ * detectable only by also checking the cache size.
+ * Dixon is NOT a Celeron.
+ */
+ if (c->x86 == 6) {
+ switch (c->x86_model) {
+ case 5:
+ if (c->x86_mask == 0) {
+ if (l2 == 0)
+ p = "Celeron (Covington)";
+ else if (l2 == 256)
+ p = "Mobile Pentium II (Dixon)";
+ }
+ break;
+
+ case 6:
+ if (l2 == 128)
+ p = "Celeron (Mendocino)";
+ else if (c->x86_mask == 0 || c->x86_mask == 5)
+ p = "Celeron-A";
+ break;
+
+ case 8:
+ if (l2 == 128)
+ p = "Celeron (Coppermine)";
+ break;
+ }
+ }
+
+ if (p)
+ strcpy(c->x86_model_id, p);
+
+ Intel_errata_workarounds(c);
+
+#ifdef CONFIG_X86_INTEL_USERCOPY
+ /*
+ * Set up the preferred alignment for movsl bulk memory moves
+ */
+ switch (c->x86) {
+ case 4: /* 486: untested */
+ break;
+ case 5: /* Old Pentia: untested */
+ break;
+ case 6: /* PII/PIII only like movsl with 8-byte alignment */
+ movsl_mask.mask = 7;
+ break;
+ case 15: /* P4 is OK down to 8-byte alignment */
+ movsl_mask.mask = 7;
+ break;
+ }
+#endif
+
+#endif
+
+ if (cpu_has_xmm2)
+ set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
if (cpu_has_ds) {
- unsigned int l1, l2;
+ unsigned int l1;
rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
if (!(l1 & (1<<11)))
set_cpu_cap(c, X86_FEATURE_BTS);
@@ -74,26 +242,125 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
ds_init_intel(c);
}
+#ifdef CONFIG_X86_64
if (c->x86 == 15)
c->x86_cache_alignment = c->x86_clflush_size * 2;
if (c->x86 == 6)
set_cpu_cap(c, X86_FEATURE_REP_GOOD);
- if (cpu_has_xmm2)
- set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
+#else
+ if (c->x86 == 15)
+ set_cpu_cap(c, X86_FEATURE_P4);
+ if (c->x86 == 6)
+ set_cpu_cap(c, X86_FEATURE_P3);
+
+ if (cpu_has_bts)
+ ptrace_bts_init_intel(c);
+
+ /*
+ * See if we have a good local APIC by checking for buggy Pentia,
+ * i.e. all B steppings and the C2 stepping of P54C when using their
+ * integrated APIC (see 11AP erratum in "Pentium Processor
+ * Specification Update").
+ */
+ if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
+ (c->x86_mask < 0x6 || c->x86_mask == 0xb))
+ set_cpu_cap(c, X86_FEATURE_11AP);
+
+#ifdef CONFIG_X86_NUMAQ
+ numaq_tsc_disable();
+#endif
+#endif
detect_extended_topology(c);
- if (!cpu_has(c, X86_FEATURE_XTOPOLOGY))
+ if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
+ /*
+ * let's use the legacy cpuid vector 0x1 and 0x4 for topology
+ * detection.
+ */
c->x86_max_cores = intel_num_cpu_cores(c);
+#ifdef CONFIG_X86_32
+ detect_ht(c);
+#endif
+ }
+ /* Work around errata */
srat_detect_node();
}
+#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 struct cpu_dev intel_cpu_dev __cpuinitdata = {
.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);
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 11:19:49 +0100