x86: cpu/common*.c, merge identify_cpu()

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

2 files changed, 147 insertions, 58 deletions

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index f35baa7f3036..eef868c97b89 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -104,34 +104,6 @@ static int __init cachesize_setup(char *str)
 }
 __setup("cachesize=", cachesize_setup);
 
-/*
- * Naming convention should be: <Name> [(<Codename>)]
- * This table only is used unless init_<vendor>() below doesn't set it;
- * in particular, if CPUID levels 0x80000002..4 are supported, this isn't used
- *
- */
-
-/* Look up CPU names by table lookup. */
-static char __cpuinit *table_lookup_model(struct cpuinfo_x86 *c)
-{
-        struct cpu_model_info *info;
-
-        if (c->x86_model >= 16)
-                return NULL;    /* Range check */
-
-        if (!this_cpu)
-                return NULL;
-
-        info = this_cpu->c_models;
-
-        while (info && info->family) {
-                if (info->family == c->x86)
-                        return info->model_names[c->x86_model];
-                info++;
-        }
-        return NULL;            /* Not found */
-}
-
 static int __init x86_fxsr_setup(char *s)
 {
         setup_clear_cpu_cap(X86_FEATURE_FXSR);
@@ -197,13 +169,48 @@ static int __init x86_serial_nr_setup(char *s)
 }
 __setup("serialnumber", x86_serial_nr_setup);
 #else
+static inline int flag_is_changeable_p(u32 flag)
+{
+        return 1;
+}
 /* Probe for the CPUID instruction */
 static inline int have_cpuid_p(void)
 {
         return 1;
 }
+static inline void squash_the_stupid_serial_number(struct cpuinfo_x86 *c)
+{
+}
 #endif
 
+/*
+ * Naming convention should be: <Name> [(<Codename>)]
+ * This table only is used unless init_<vendor>() below doesn't set it;
+ * in particular, if CPUID levels 0x80000002..4 are supported, this isn't used
+ *
+ */
+
+/* Look up CPU names by table lookup. */
+static char __cpuinit *table_lookup_model(struct cpuinfo_x86 *c)
+{
+        struct cpu_model_info *info;
+
+        if (c->x86_model >= 16)
+                return NULL;    /* Range check */
+
+        if (!this_cpu)
+                return NULL;
+
+        info = this_cpu->c_models;
+
+        while (info && info->family) {
+                if (info->family == c->x86)
+                        return info->model_names[c->x86_model];
+                info++;
+        }
+        return NULL;            /* Not found */
+}
+
 __u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;
 
 /* Current gdt points %fs at the "master" per-cpu area: after this,
@@ -620,12 +627,18 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
         c->loops_per_jiffy = loops_per_jiffy;
         c->x86_cache_size = -1;
         c->x86_vendor = X86_VENDOR_UNKNOWN;
-        c->cpuid_level = -1;    /* CPUID not detected */
         c->x86_model = c->x86_mask = 0; /* So far unknown... */
         c->x86_vendor_id[0] = '\0'; /* Unset */
         c->x86_model_id[0] = '\0';  /* Unset */
         c->x86_max_cores = 1;
+#ifdef CONFIG_X86_64
+        c->x86_coreid_bits = 0;
+        c->x86_clflush_size = 64;
+#else
+        c->cpuid_level = -1;    /* CPUID not detected */
         c->x86_clflush_size = 32;
+#endif
+        c->x86_cache_alignment = c->x86_clflush_size;
         memset(&c->x86_capability, 0, sizeof c->x86_capability);
 
         if (!have_cpuid_p()) {
@@ -644,6 +657,10 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
         if (this_cpu->c_identify)
                 this_cpu->c_identify(c);
 
+#ifdef CONFIG_X86_64
+        c->apicid = phys_pkg_id(0);
+#endif
+
         /*
          * Vendor-specific initialization.  In this section we
          * canonicalize the feature flags, meaning if there are
@@ -677,6 +694,10 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
                                 c->x86, c->x86_model);
         }
 
+#ifdef CONFIG_X86_64
+        detect_ht(c);
+#endif
+
         /*
          * On SMP, boot_cpu_data holds the common feature set between
          * all CPUs; so make sure that we indicate which features are
@@ -693,24 +714,34 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
         for (i = 0; i < NCAPINTS; i++)
                 c->x86_capability[i] &= ~cleared_cpu_caps[i];
 
+#ifdef CONFIG_X86_MCE
         /* Init Machine Check Exception if available. */
         mcheck_init(c);
+#endif
 
         select_idle_routine(c);
+
+#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
+        numa_add_cpu(smp_processor_id());
+#endif
 }
 
 void __init identify_boot_cpu(void)
 {
         identify_cpu(&boot_cpu_data);
+#ifdef CONFIG_X86_32
         sysenter_setup();
         enable_sep_cpu();
+#endif
 }
 
 void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c)
 {
         BUG_ON(c == &boot_cpu_data);
         identify_cpu(c);
+#ifdef CONFIG_X86_32
         enable_sep_cpu();
+#endif
         mtrr_ap_init();
 }
 
diff --git a/arch/x86/kernel/cpu/common_64.c b/arch/x86/kernel/cpu/common_64.c
index 869a6ff9f7dc..6a42371a609f 100644
--- a/arch/x86/kernel/cpu/common_64.c
+++ b/arch/x86/kernel/cpu/common_64.c
@@ -103,34 +103,6 @@ static int __init cachesize_setup(char *str)
 }
 __setup("cachesize=", cachesize_setup);
 
-/*
- * Naming convention should be: <Name> [(<Codename>)]
- * This table only is used unless init_<vendor>() below doesn't set it;
- * in particular, if CPUID levels 0x80000002..4 are supported, this isn't used
- *
- */
-
-/* Look up CPU names by table lookup. */
-static char __cpuinit *table_lookup_model(struct cpuinfo_x86 *c)
-{
-        struct cpu_model_info *info;
-
-        if (c->x86_model >= 16)
-                return NULL;    /* Range check */
-
-        if (!this_cpu)
-                return NULL;
-
-        info = this_cpu->c_models;
-
-        while (info && info->family) {
-                if (info->family == c->x86)
-                        return info->model_names[c->x86_model];
-                info++;
-        }
-        return NULL;            /* Not found */
-}
-
 static int __init x86_fxsr_setup(char *s)
 {
         setup_clear_cpu_cap(X86_FEATURE_FXSR);
@@ -196,13 +168,48 @@ static int __init x86_serial_nr_setup(char *s)
 }
 __setup("serialnumber", x86_serial_nr_setup);
 #else
+static inline int flag_is_changeable_p(u32 flag)
+{
+        return 1;
+}
 /* Probe for the CPUID instruction */
 static inline int have_cpuid_p(void)
 {
         return 1;
 }
+static inline void squash_the_stupid_serial_number(struct cpuinfo_x86 *c)
+{
+}
 #endif
 
+/*
+ * Naming convention should be: <Name> [(<Codename>)]
+ * This table only is used unless init_<vendor>() below doesn't set it;
+ * in particular, if CPUID levels 0x80000002..4 are supported, this isn't used
+ *
+ */
+
+/* Look up CPU names by table lookup. */
+static char __cpuinit *table_lookup_model(struct cpuinfo_x86 *c)
+{
+        struct cpu_model_info *info;
+
+        if (c->x86_model >= 16)
+                return NULL;    /* Range check */
+
+        if (!this_cpu)
+                return NULL;
+
+        info = this_cpu->c_models;
+
+        while (info && info->family) {
+                if (info->family == c->x86)
+                        return info->model_names[c->x86_model];
+                info++;
+        }
+        return NULL;            /* Not found */
+}
+
 __u32 cleared_cpu_caps[NCAPINTS] __cpuinitdata;
 
 /* Current gdt points %fs at the "master" per-cpu area: after this,
@@ -628,14 +635,35 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
         c->x86_vendor_id[0] = '\0'; /* Unset */
         c->x86_model_id[0] = '\0';  /* Unset */
         c->x86_max_cores = 1;
+#ifdef CONFIG_X86_64
         c->x86_coreid_bits = 0;
         c->x86_clflush_size = 64;
+#else
+        c->cpuid_level = -1;    /* CPUID not detected */
+        c->x86_clflush_size = 32;
+#endif
         c->x86_cache_alignment = c->x86_clflush_size;
         memset(&c->x86_capability, 0, sizeof c->x86_capability);
 
+        if (!have_cpuid_p()) {
+                /*
+                 * First of all, decide if this is a 486 or higher
+                 * It's a 486 if we can modify the AC flag
+                 */
+                if (flag_is_changeable_p(X86_EFLAGS_AC))
+                        c->x86 = 4;
+                else
+                        c->x86 = 3;
+        }
+
         generic_identify(c);
 
+        if (this_cpu->c_identify)
+                this_cpu->c_identify(c);
+
+#ifdef CONFIG_X86_64
         c->apicid = phys_pkg_id(0);
+#endif
 
         /*
          * Vendor-specific initialization.  In this section we
@@ -650,7 +678,29 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
         if (this_cpu->c_init)
                 this_cpu->c_init(c);
 
+        /* Disable the PN if appropriate */
+        squash_the_stupid_serial_number(c);
+
+        /*
+         * The vendor-specific functions might have changed features.  Now
+         * we do "generic changes."
+         */
+
+        /* If the model name is still unset, do table lookup. */
+        if (!c->x86_model_id[0]) {
+                char *p;
+                p = table_lookup_model(c);
+                if (p)
+                        strcpy(c->x86_model_id, p);
+                else
+                        /* Last resort... */
+                        sprintf(c->x86_model_id, "%02x/%02x",
+                                c->x86, c->x86_model);
+        }
+
+#ifdef CONFIG_X86_64
         detect_ht(c);
+#endif
 
         /*
          * On SMP, boot_cpu_data holds the common feature set between
@@ -669,11 +719,12 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
                 c->x86_capability[i] &= ~cleared_cpu_caps[i];
 
 #ifdef CONFIG_X86_MCE
+        /* Init Machine Check Exception if available. */
         mcheck_init(c);
 #endif
         select_idle_routine(c);
 
-#ifdef CONFIG_NUMA
+#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
         numa_add_cpu(smp_processor_id());
 #endif
 
@@ -682,12 +733,19 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
 void __init identify_boot_cpu(void)
 {
         identify_cpu(&boot_cpu_data);
+#ifdef CONFIG_X86_32
+        sysenter_setup();
+        enable_sep_cpu();
+#endif
 }
 
 void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c)
 {
         BUG_ON(c == &boot_cpu_data);
         identify_cpu(c);
+#ifdef CONFIG_X86_32
+        enable_sep_cpu();
+#endif
         mtrr_ap_init();
 }