setup.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,210 行 · 第 1/3 页

};

static void __init init_intel(struct cpuinfo_x86 *c)
{
	/* Cache sizes */
	unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0; 
	unsigned n;

	if (c->cpuid_level > 1) {
		/* supports eax=2  call */
		int i, j, n;
		int regs[4];
		unsigned char *dp = (unsigned char *)regs;

		/* Number of times to iterate */
		n = cpuid_eax(2) & 0xFF;

		for ( i = 0 ; i < n ; i++ ) {
			cpuid(2, &regs[0], &regs[1], &regs[2], &regs[3]);
			
			/* If bit 31 is set, this is an unknown format */
			for ( j = 0 ; j < 3 ; j++ ) {
				if ( regs[j] < 0 ) regs[j] = 0;
			}

			/* Byte 0 is level count, not a descriptor */
			for ( j = 1 ; j < 16 ; j++ ) {
				unsigned char des = dp[j];
				unsigned char k = 0;

				/* look up this descriptor in the table */
				while (cache_table[k].descriptor != 0)
				{
					if (cache_table[k].descriptor == des) {
						switch (cache_table[k].cache_type) {
						case LVL_1_INST:
							l1i += cache_table[k].size;
							break;
						case LVL_1_DATA:
							l1d += cache_table[k].size;
							break;
						case LVL_2:
							l2 += cache_table[k].size;
							break;
						case LVL_3:
							l3 += cache_table[k].size;
							break;
						case LVL_TRACE:
							trace += cache_table[k].size;
							break;
						}

						break;
					}

					k++;
				}
			}
		}

		if (trace)
			printk (KERN_INFO "CPU: Trace cache: %dK uops", trace);
		else if (l1i)
			printk (KERN_INFO "CPU: L1 I cache: %dK", l1i);
		if (l1d)
			printk(", L1 D cache: %dK\n", l1d);
		else
			printk("\n"); 
		if (l2)
			printk(KERN_INFO "CPU: L2 cache: %dK\n", l2);
		if (l3)
			printk(KERN_INFO "CPU: L3 cache: %dK\n", l3);

		c->x86_cache_size = l2 ? l2 : (l1i+l1d);
	}

	n = cpuid_eax(0x80000000);
	if (n >= 0x80000008) {
		unsigned eax = cpuid_eax(0x80000008);
		c->x86_virt_bits = (eax >> 8) & 0xff;
		c->x86_phys_bits = eax & 0xff;
	}

	if (c->x86 == 15)
		c->x86_cache_alignment = c->x86_clflush_size * 2;
}

void __init get_cpu_vendor(struct cpuinfo_x86 *c)
{
	char *v = c->x86_vendor_id;

	if (!strcmp(v, "AuthenticAMD"))
		c->x86_vendor = X86_VENDOR_AMD;
	else if (!strcmp(v, "GenuineIntel"))
		c->x86_vendor = X86_VENDOR_INTEL;
	else
		c->x86_vendor = X86_VENDOR_UNKNOWN;
}

struct cpu_model_info {
	int vendor;
	int family;
	char *model_names[16];
};

/* Do some early cpuid on the boot CPU to get some parameter that are
   needed before check_bugs. Everything advanced is in identify_cpu
   below. */
void __init early_identify_cpu(struct cpuinfo_x86 *c)
{
	u32 tfms;

	c->loops_per_jiffy = loops_per_jiffy;
	c->x86_cache_size = -1;
	c->x86_vendor = X86_VENDOR_UNKNOWN;
	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_clflush_size = 64;
	c->x86_cache_alignment = c->x86_clflush_size;
	c->x86_num_cores = 1;
	c->x86_apicid = c == &boot_cpu_data ? 0 : c - cpu_data;
	memset(&c->x86_capability, 0, sizeof c->x86_capability);

	/* Get vendor name */
	cpuid(0x00000000, &c->cpuid_level,
	      (int *)&c->x86_vendor_id[0],
	      (int *)&c->x86_vendor_id[8],
	      (int *)&c->x86_vendor_id[4]);
		
	get_cpu_vendor(c);

	/* Initialize the standard set of capabilities */
	/* Note that the vendor-specific code below might override */

	/* Intel-defined flags: level 0x00000001 */
	if (c->cpuid_level >= 0x00000001) {
		__u32 misc;
		cpuid(0x00000001, &tfms, &misc, &c->x86_capability[4],
		      &c->x86_capability[0]);
		c->x86 = (tfms >> 8) & 0xf;
		c->x86_model = (tfms >> 4) & 0xf;
		c->x86_mask = tfms & 0xf;
		if (c->x86 == 0xf) {
			c->x86 += (tfms >> 20) & 0xff;
			c->x86_model += ((tfms >> 16) & 0xF) << 4;
		} 
		if (c->x86_capability[0] & (1<<19)) 
			c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
		c->x86_apicid = misc >> 24;
	} else {
		/* Have CPUID level 0 only - unheard of */
		c->x86 = 4;
	}
}

/*
 * This does the hard work of actually picking apart the CPU stuff...
 */
void __init identify_cpu(struct cpuinfo_x86 *c)
{
	int i;
	u32 xlvl;

	early_identify_cpu(c);

	/* AMD-defined flags: level 0x80000001 */
	xlvl = cpuid_eax(0x80000000);
	if ( (xlvl & 0xffff0000) == 0x80000000 ) {
		if ( xlvl >= 0x80000001 ) {
			c->x86_capability[1] = cpuid_edx(0x80000001);
			c->x86_capability[5] = cpuid_ecx(0x80000001);
		}
		if ( xlvl >= 0x80000004 )
			get_model_name(c); /* Default name */
	}

	/* Transmeta-defined flags: level 0x80860001 */
	xlvl = cpuid_eax(0x80860000);
	if ( (xlvl & 0xffff0000) == 0x80860000 ) {
		if (  xlvl >= 0x80860001 )
			c->x86_capability[2] = cpuid_edx(0x80860001);
	}

	/*
	 * 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!
	 */
	switch ( c->x86_vendor ) {

		case X86_VENDOR_AMD:
			init_amd(c);
			break;

		case X86_VENDOR_INTEL:
			init_intel(c); 
			break; 

		case X86_VENDOR_UNKNOWN:
		default:
			display_cacheinfo(c);
			break;
	}

	select_idle_routine(c);
	detect_ht(c); 
		
	/*
	 * 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];
	}

	mcheck_init(c);
}
 

void __init print_cpu_info(struct cpuinfo_x86 *c)
{
	if (c->x86_model_id[0])
		printk("%s", c->x86_model_id);

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

/*
 *	Get CPU information for use by the procfs.
 */

static int show_cpuinfo(struct seq_file *m, void *v)
{
	struct cpuinfo_x86 *c = v;

	/* 
	 * These flag bits must match the definitions in <asm/cpufeature.h>.
	 * NULL means this bit is undefined or reserved; either way it doesn't
	 * have meaning as far as Linux is concerned.  Note that it's important
	 * to realize there is a difference between this table and CPUID -- if
	 * applications want to get the raw CPUID data, they should access
	 * /dev/cpu/<cpu_nr>/cpuid instead.
	 */
	static char *x86_cap_flags[] = {
		/* Intel-defined */
	        "fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
	        "cx8", "apic", NULL, "sep", "mtrr", "pge", "mca", "cmov",
	        "pat", "pse36", "pn", "clflush", NULL, "dts", "acpi", "mmx",
	        "fxsr", "sse", "sse2", "ss", "ht", "tm", "ia64", NULL,

		/* AMD-defined */
		NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
		NULL, NULL, NULL, "syscall", NULL, NULL, NULL, NULL,
		NULL, NULL, NULL, NULL, "nx", NULL, "mmxext", NULL,
		NULL, NULL, NULL, NULL, NULL, "lm", "3dnowext", "3dnow",

		/* Transmeta-defined */
		"recovery", "longrun", NULL, "lrti", NULL, NULL, NULL, NULL,
		NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
		NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
		NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,

		/* Other (Linux-defined) */
		"cxmmx", "k6_mtrr", "cyrix_arr", "centaur_mcr", NULL, NULL, NULL, NULL,
		NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
		NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
		NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,

		/* Intel-defined (#2) */
		"pni", NULL, NULL, "monitor", "ds_cpl", NULL, NULL, "est",
		"tm2", NULL, "cid", NULL, NULL, "cx16", "xtpr", NULL,
		NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
		NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
	};
	static char *x86_power_flags[] = { 
		"ts",	/* temperature sensor */
		"fid",  /* frequency id control */
		"vid",  /* voltage id control */
		"ttp",  /* thermal trip */
	};


#ifdef CONFIG_SMP
	if (!cpu_online(c-cpu_data))
		return 0;
#endif

	seq_printf(m,"processor\t: %u\n"
		     "vendor_id\t: %s\n"
		     "cpu family\t: %d\n"
		     "model\t\t: %d\n"
		     "model name\t: %s\n",
		     (unsigned)(c-cpu_data),
		     c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
		     c->x86,
		     (int)c->x86_model,
		     c->x86_model_id[0] ? c->x86_model_id : "unknown");
	
	if (c->x86_mask || c->cpuid_level >= 0)
		seq_printf(m, "stepping\t: %d\n", c->x86_mask);
	else
		seq_printf(m, "stepping\t: unknown\n");
	
	if (cpu_has(c,X86_FEATURE_TSC)) {
		seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
			     cpu_khz / 1000, (cpu_khz % 1000));
	}

	/* Cache size */
	if (c->x86_cache_size >= 0) 
		seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
	
#ifdef CONFIG_X86_HT
	if (cpu_has_ht) {
		seq_printf(m, "physical id\t: %d\n", phys_proc_id[c - cpu_data]);
		seq_printf(m, "siblings\t: %d\n", smp_num_siblings);
	}
#endif	

	seq_printf(m,
	        "fpu\t\t: yes\n"
	        "fpu_exception\t: yes\n"
	        "cpuid level\t: %d\n"
	        "wp\t\t: yes\n"
	        "flags\t\t:",
		   c->cpuid_level);

	{ 
		int i; 
		for ( i = 0 ; i < 32*NCAPINTS ; i++ )
			if ( test_bit(i, &c->x86_capability) &&
			     x86_cap_flags[i] != NULL )
				seq_printf(m, " %s", x86_cap_flags[i]);
	}
		
	seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
		   c->loops_per_jiffy/(500000/HZ),
		   (c->loops_per_jiffy/(5000/HZ)) % 100);

	if (c->x86_tlbsize > 0) 
		seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
	seq_printf(m, "clflush size\t: %d\n", c->x86_clflush_size);
	seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);

	seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n", 
		   c->x86_phys_bits, c->x86_virt_bits);

	seq_printf(m, "power management:");
	{
		unsigned i;
		for (i = 0; i < 32; i++) 
			if (c->x86_power & (1 << i)) {
				if (i < ARRAY_SIZE(x86_power_flags))
					seq_printf(m, " %s", x86_power_flags[i]);
				else
					seq_printf(m, " [%d]", i);
			}
	}

	if (c->x86_num_cores > 1)
		seq_printf(m, "cpu cores\t: %d\n", c->x86_num_cores);

	seq_printf(m, "\n\n"); 

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < NR_CPUS ? cpu_data + *pos : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

struct seq_operations cpuinfo_op = {
	.start =c_start,
	.next =	c_next,
	.stop =	c_stop,
	.show =	show_cpuinfo,
};