x86: intel.c put workaround for old cpus together

consolidate the code some more.

No change in functionality intended.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 365a008..5f76bf1 100644 (file)
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -63,15 +63,54 @@ int __cpuinit ppro_with_ram_bug(void)
        return 0;
 }
 
+#ifdef CONFIG_X86_F00F_BUG
+static void __cpuinit trap_init_f00f_bug(void)
+{
+       __set_fixmap(FIX_F00F_IDT, __pa(&idt_table), PAGE_KERNEL_RO);
 
-/*
- * 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)
+       /*
+        * 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
+
+static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
 {
        unsigned long lo, hi;
 
+#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
+
+       /*
+        * 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);
+
+       /*
+        * P4 Xeon errata 037 workaround.
+        * Hardware prefetcher may cause stale data to be loaded into the cache.
+        */
        if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
                rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
                if ((lo & (1<<9)) == 0) {
@@ -81,23 +120,44 @@ static void __cpuinit Intel_errata_workarounds(struct cpuinfo_x86 *c)
                        wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
                }
        }
-}
-
 
+       /*
+        * 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_F00F_BUG
-static void __cpuinit trap_init_f00f_bug(void)
-{
-       __set_fixmap(FIX_F00F_IDT, __pa(&idt_table), PAGE_KERNEL_RO);
 
+#ifdef CONFIG_X86_INTEL_USERCOPY
        /*
-        * Update the IDT descriptor and reload the IDT so that
-        * it uses the read-only mapped virtual address.
+        * Set up the preferred alignment for movsl bulk memory moves
         */
-       idt_descr.address = fix_to_virt(FIX_F00F_IDT);
-       load_idt(&idt_descr);
-}
+       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
+
+#ifdef CONFIG_X86_NUMAQ
+       numaq_tsc_disable();
+#endif
+}
+#else
+static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
+{
+}
 #endif
 
 static void __cpuinit srat_detect_node(void)
@@ -139,28 +199,10 @@ static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
 static void __cpuinit init_intel(struct cpuinfo_x86 *c)
 {
        unsigned int l2 = 0;
-       char *p = NULL;
 
        early_init_intel(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
+       intel_workarounds(c);
 
        l2 = init_intel_cacheinfo(c);
        if (c->cpuid_level > 9) {
@@ -170,17 +212,32 @@ 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);
+       if (cpu_has_xmm2)
+               set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
+       if (cpu_has_ds) {
+               unsigned int l1;
+               rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
+               if (!(l1 & (1<<11)))
+                       set_cpu_cap(c, X86_FEATURE_BTS);
+               if (!(l1 & (1<<12)))
+                       set_cpu_cap(c, X86_FEATURE_PEBS);
+               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);
+#else
        /*
         * Names for the Pentium II/Celeron processors
         * detectable only by also checking the cache size.
         * Dixon is NOT a Celeron.
         */
        if (c->x86 == 6) {
+               char *p = NULL;
+
                switch (c->x86_model) {
                case 5:
                        if (c->x86_mask == 0) {
@@ -203,51 +260,11 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
                                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;
+               if (p)
+                       strcpy(c->x86_model_id, p);
        }
-#endif
-
-#endif
 
-       if (cpu_has_xmm2)
-               set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
-       if (cpu_has_ds) {
-               unsigned int l1;
-               rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
-               if (!(l1 & (1<<11)))
-                       set_cpu_cap(c, X86_FEATURE_BTS);
-               if (!(l1 & (1<<12)))
-                       set_cpu_cap(c, X86_FEATURE_PEBS);
-               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);
-#else
        if (c->x86 == 15)
                set_cpu_cap(c, X86_FEATURE_P4);
        if (c->x86 == 6)
@@ -256,19 +273,6 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
        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);