common.c

linux-2.6.15.6

{
	int i;

	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;
	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);

	printk(KERN_DEBUG "CPU: After generic identify, caps:");
	for (i = 0; i < NCAPINTS; i++)
		printk(" %08lx", c->x86_capability[i]);
	printk("\n");

	if (this_cpu->c_identify) {
		this_cpu->c_identify(c);

		printk(KERN_DEBUG "CPU: After vendor identify, caps:");
		for (i = 0; i < NCAPINTS; i++)
			printk(" %08lx", c->x86_capability[i]);
		printk("\n");
	}

	/*
	 * Vendor-specific initialization.  In this section we
	 * canonicalize the feature flags, meaning if there are
	 * features a certain CPU supports which CPUID doesn't
	 * tell us, CPUID claiming incorrect flags, or other bugs,
	 * we handle them here.
	 *
	 * At the end of this section, c->x86_capability better
	 * indicate the features this CPU genuinely supports!
	 */
	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."
	 */

	/* TSC disabled? */
	if ( tsc_disable )
		clear_bit(X86_FEATURE_TSC, c->x86_capability);

	/* FXSR disabled? */
	if (disable_x86_fxsr) {
		clear_bit(X86_FEATURE_FXSR, c->x86_capability);
		clear_bit(X86_FEATURE_XMM, c->x86_capability);
	}

	if (disable_pse)
		clear_bit(X86_FEATURE_PSE, c->x86_capability);

	/* 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_vendor, c->x86_model);
	}

	/* Now the feature flags better reflect actual CPU features! */

	printk(KERN_DEBUG "CPU: After all inits, caps:");
	for (i = 0; i < NCAPINTS; i++)
		printk(" %08lx", c->x86_capability[i]);
	printk("\n");

	/*
	 * On SMP, boot_cpu_data holds the common feature set between
	 * all CPUs; so make sure that we indicate which features are
	 * common between the CPUs.  The first time this routine gets
	 * executed, c == &boot_cpu_data.
	 */
	if ( c != &boot_cpu_data ) {
		/* AND the already accumulated flags with these */
		for ( i = 0 ; i < NCAPINTS ; i++ )
			boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
	}

	/* Init Machine Check Exception if available. */
	mcheck_init(c);

	if (c == &boot_cpu_data)
		sysenter_setup();
	enable_sep_cpu();

	if (c == &boot_cpu_data)
		mtrr_bp_init();
	else
		mtrr_ap_init();
}

#ifdef CONFIG_X86_HT
void __devinit detect_ht(struct cpuinfo_x86 *c)
{
	u32 	eax, ebx, ecx, edx;
	int 	index_msb, core_bits;
	int 	cpu = smp_processor_id();

	cpuid(1, &eax, &ebx, &ecx, &edx);

	c->apicid = phys_pkg_id((ebx >> 24) & 0xFF, 0);

	if (!cpu_has(c, X86_FEATURE_HT) || cpu_has(c, X86_FEATURE_CMP_LEGACY))
		return;

	smp_num_siblings = (ebx & 0xff0000) >> 16;

	if (smp_num_siblings == 1) {
		printk(KERN_INFO  "CPU: Hyper-Threading is disabled\n");
	} else if (smp_num_siblings > 1 ) {

		if (smp_num_siblings > NR_CPUS) {
			printk(KERN_WARNING "CPU: Unsupported number of the siblings %d", smp_num_siblings);
			smp_num_siblings = 1;
			return;
		}

		index_msb = get_count_order(smp_num_siblings);
		phys_proc_id[cpu] = phys_pkg_id((ebx >> 24) & 0xFF, index_msb);

		printk(KERN_INFO  "CPU: Physical Processor ID: %d\n",
		       phys_proc_id[cpu]);

		smp_num_siblings = smp_num_siblings / c->x86_max_cores;

		index_msb = get_count_order(smp_num_siblings) ;

		core_bits = get_count_order(c->x86_max_cores);

		cpu_core_id[cpu] = phys_pkg_id((ebx >> 24) & 0xFF, index_msb) &
					       ((1 << core_bits) - 1);

		if (c->x86_max_cores > 1)
			printk(KERN_INFO  "CPU: Processor Core ID: %d\n",
			       cpu_core_id[cpu]);
	}
}
#endif

void __devinit print_cpu_info(struct cpuinfo_x86 *c)
{
	char *vendor = NULL;

	if (c->x86_vendor < X86_VENDOR_NUM)
		vendor = this_cpu->c_vendor;
	else if (c->cpuid_level >= 0)
		vendor = c->x86_vendor_id;

	if (vendor && strncmp(c->x86_model_id, vendor, strlen(vendor)))
		printk("%s ", vendor);

	if (!c->x86_model_id[0])
		printk("%d86", c->x86);
	else
		printk("%s", c->x86_model_id);

	if (c->x86_mask || c->cpuid_level >= 0) 
		printk(" stepping %02x\n", c->x86_mask);
	else
		printk("\n");
}

cpumask_t cpu_initialized __devinitdata = CPU_MASK_NONE;

/* This is hacky. :)
 * We're emulating future behavior.
 * In the future, the cpu-specific init functions will be called implicitly
 * via the magic of initcalls.
 * They will insert themselves into the cpu_devs structure.
 * Then, when cpu_init() is called, we can just iterate over that array.
 */

extern int intel_cpu_init(void);
extern int cyrix_init_cpu(void);
extern int nsc_init_cpu(void);
extern int amd_init_cpu(void);
extern int centaur_init_cpu(void);
extern int transmeta_init_cpu(void);
extern int rise_init_cpu(void);
extern int nexgen_init_cpu(void);
extern int umc_init_cpu(void);

void __init early_cpu_init(void)
{
	intel_cpu_init();
	cyrix_init_cpu();
	nsc_init_cpu();
	amd_init_cpu();
	centaur_init_cpu();
	transmeta_init_cpu();
	rise_init_cpu();
	nexgen_init_cpu();
	umc_init_cpu();
	early_cpu_detect();

#ifdef CONFIG_DEBUG_PAGEALLOC
	/* pse is not compatible with on-the-fly unmapping,
	 * disable it even if the cpus claim to support it.
	 */
	clear_bit(X86_FEATURE_PSE, boot_cpu_data.x86_capability);
	disable_pse = 1;
#endif
}
/*
 * cpu_init() initializes state that is per-CPU. Some data is already
 * initialized (naturally) in the bootstrap process, such as the GDT
 * and IDT. We reload them nevertheless, this function acts as a
 * 'CPU state barrier', nothing should get across.
 */
void __devinit cpu_init(void)
{
	int cpu = smp_processor_id();
	struct tss_struct * t = &per_cpu(init_tss, cpu);
	struct thread_struct *thread = &current->thread;
	struct desc_struct *gdt = get_cpu_gdt_table(cpu);
	__u32 stk16_off = (__u32)&per_cpu(cpu_16bit_stack, cpu);

	if (cpu_test_and_set(cpu, cpu_initialized)) {
		printk(KERN_WARNING "CPU#%d already initialized!\n", cpu);
		for (;;) local_irq_enable();
	}
	printk(KERN_INFO "Initializing CPU#%d\n", cpu);

	if (cpu_has_vme || cpu_has_tsc || cpu_has_de)
		clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE);
	if (tsc_disable && cpu_has_tsc) {
		printk(KERN_NOTICE "Disabling TSC...\n");
		/**** FIX-HPA: DOES THIS REALLY BELONG HERE? ****/
		clear_bit(X86_FEATURE_TSC, boot_cpu_data.x86_capability);
		set_in_cr4(X86_CR4_TSD);
	}

	/*
	 * Initialize the per-CPU GDT with the boot GDT,
	 * and set up the GDT descriptor:
	 */
 	memcpy(gdt, cpu_gdt_table, GDT_SIZE);

	/* Set up GDT entry for 16bit stack */
 	*(__u64 *)(&gdt[GDT_ENTRY_ESPFIX_SS]) |=
		((((__u64)stk16_off) << 16) & 0x000000ffffff0000ULL) |
		((((__u64)stk16_off) << 32) & 0xff00000000000000ULL) |
		(CPU_16BIT_STACK_SIZE - 1);

	cpu_gdt_descr[cpu].size = GDT_SIZE - 1;
 	cpu_gdt_descr[cpu].address = (unsigned long)gdt;

	load_gdt(&cpu_gdt_descr[cpu]);
	load_idt(&idt_descr);

	/*
	 * Delete NT
	 */
	__asm__("pushfl ; andl $0xffffbfff,(%esp) ; popfl");

	/*
	 * Set up and load the per-CPU TSS and LDT
	 */
	atomic_inc(&init_mm.mm_count);
	current->active_mm = &init_mm;
	if (current->mm)
		BUG();
	enter_lazy_tlb(&init_mm, current);

	load_esp0(t, thread);
	set_tss_desc(cpu,t);
	load_TR_desc();
	load_LDT(&init_mm.context);

	/* Set up doublefault TSS pointer in the GDT */
	__set_tss_desc(cpu, GDT_ENTRY_DOUBLEFAULT_TSS, &doublefault_tss);

	/* Clear %fs and %gs. */
	asm volatile ("xorl %eax, %eax; movl %eax, %fs; movl %eax, %gs");

	/* Clear all 6 debug registers: */
	set_debugreg(0, 0);
	set_debugreg(0, 1);
	set_debugreg(0, 2);
	set_debugreg(0, 3);
	set_debugreg(0, 6);
	set_debugreg(0, 7);

	/*
	 * Force FPU initialization:
	 */
	current_thread_info()->status = 0;
	clear_used_math();
	mxcsr_feature_mask_init();
}

#ifdef CONFIG_HOTPLUG_CPU
void __devinit cpu_uninit(void)
{
	int cpu = raw_smp_processor_id();
	cpu_clear(cpu, cpu_initialized);

	/* lazy TLB state */
	per_cpu(cpu_tlbstate, cpu).state = 0;
	per_cpu(cpu_tlbstate, cpu).active_mm = &init_mm;
}
#endif