setup.c

讲述linux的初始化过程

		      type_name, (*var_name ? " variation " : ""), var_name,
		      hwrpb->sys_type, hwrpb->sys_variation);
	}
	if (vec != &alpha_mv) {
		alpha_mv = *vec;
	}
	
	printk("Booting "
#ifdef CONFIG_ALPHA_GENERIC
	       "GENERIC "
#endif
	       "on %s%s%s using machine vector %s from %s\n",
	       type_name, (*var_name ? " variation " : ""),
	       var_name, alpha_mv.vector_name,
	       (alpha_using_srm ? "SRM" : "MILO"));

	printk("Command line: %s\n", command_line);

	/* 
	 * Sync up the HAE.
	 * Save the SRM's current value for restoration.
	 */
	srm_hae = *alpha_mv.hae_register;
	__set_hae(alpha_mv.hae_cache);

	/* Reset enable correctable error reports.  */
	wrmces(0x7);

	/* Find our memory.  */
	setup_memory(kernel_end);

	/* Initialize the machine.  Usually has to do with setting up
	   DMA windows and the like.  */
	if (alpha_mv.init_arch)
		alpha_mv.init_arch();

	/* Reserve standard resources.  */
	reserve_std_resources();

	/* 
	 * Give us a default console.  TGA users will see nothing until
	 * chr_dev_init is called, rather late in the boot sequence.
	 */

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
	conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
#endif

	/* Default root filesystem to sda2.  */
	ROOT_DEV = to_kdev_t(0x0802);

 	/*
	 * Check ASN in HWRPB for validity, report if bad.
	 * FIXME: how was this failing?  Should we trust it instead,
	 * and copy the value into alpha_mv.max_asn?
 	 */

 	if (hwrpb->max_asn != MAX_ASN) {
		printk("Max ASN from HWRPB is bad (0x%lx)\n", hwrpb->max_asn);
 	}

	/*
	 * Identify the flock of penguins.
	 */

#ifdef CONFIG_SMP
	setup_smp();
#endif
	paging_init();
}

static char sys_unknown[] = "Unknown";
static char systype_names[][16] = {
	"0",
	"ADU", "Cobra", "Ruby", "Flamingo", "Mannequin", "Jensen",
	"Pelican", "Morgan", "Sable", "Medulla", "Noname",
	"Turbolaser", "Avanti", "Mustang", "Alcor", "Tradewind",
	"Mikasa", "EB64", "EB66", "EB64+", "AlphaBook1",
	"Rawhide", "K2", "Lynx", "XL", "EB164", "Noritake",
	"Cortex", "29", "Miata", "XXM", "Takara", "Yukon",
	"Tsunami", "Wildfire", "CUSCO", "Eiger", "Titan"
};

static char unofficial_names[][8] = {"100", "Ruffian"};

static char api_names[][16] = {"200", "Nautilus"};

static char eb164_names[][8] = {"EB164", "PC164", "LX164", "SX164", "RX164"};
static int eb164_indices[] = {0,0,0,1,1,1,1,1,2,2,2,2,3,3,3,3,4};

static char alcor_names[][16] = {"Alcor", "Maverick", "Bret"};
static int alcor_indices[] = {0,0,0,1,1,1,0,0,0,0,0,0,2,2,2,2,2,2};

static char eb64p_names[][16] = {"EB64+", "Cabriolet", "AlphaPCI64"};
static int eb64p_indices[] = {0,0,1,2};

static char eb66_names[][8] = {"EB66", "EB66+"};
static int eb66_indices[] = {0,0,1};

static char rawhide_names[][16] = {
	"Dodge", "Wrangler", "Durango", "Tincup", "DaVinci"
};
static int rawhide_indices[] = {0,0,0,1,1,2,2,3,3,4,4};

static char titan_names[][16] = {
	"0", "Privateer"
};
static int titan_indices[] = {0,1};

static char tsunami_names[][16] = {
	"0", "DP264", "Warhol", "Windjammer", "Monet", "Clipper",
	"Goldrush", "Webbrick", "Catamaran"
};
static int tsunami_indices[] = {0,1,2,3,4,5,6,7,8};

static struct alpha_machine_vector * __init
get_sysvec(long type, long variation, long cpu)
{
	static struct alpha_machine_vector *systype_vecs[] __initdata =
	{
		NULL,		/* 0 */
		NULL,		/* ADU */
		NULL,		/* Cobra */
		NULL,		/* Ruby */
		NULL,		/* Flamingo */
		NULL,		/* Mannequin */
		&jensen_mv,
		NULL, 		/* Pelican */
		NULL,		/* Morgan */
		NULL,		/* Sable -- see below.  */
		NULL,		/* Medulla */
		&noname_mv,
		NULL,		/* Turbolaser */
		&avanti_mv,
		NULL,		/* Mustang */
		&alcor_mv,	/* Alcor, Bret, Maverick.  */
		NULL,		/* Tradewind */
		NULL,		/* Mikasa -- see below.  */
		NULL,		/* EB64 */
		NULL,		/* EB66 -- see variation.  */
		NULL,		/* EB64+ -- see variation.  */
		&alphabook1_mv,
		&rawhide_mv,
		NULL,		/* K2 */
		NULL,		/* Lynx */
		&xl_mv,
		NULL,		/* EB164 -- see variation.  */
		NULL,		/* Noritake -- see below.  */
		NULL,		/* Cortex */
		NULL,		/* 29 */
		&miata_mv,
		NULL,		/* XXM */
		&takara_mv,
		NULL,		/* Yukon */
		NULL,		/* Tsunami -- see variation.  */
		&wildfire_mv,	/* Wildfire */
		NULL,		/* CUSCO */
		&eiger_mv,	/* Eiger */
		NULL,		/* Titan */
	};

	static struct alpha_machine_vector *unofficial_vecs[] __initdata =
	{
		NULL,		/* 100 */
		&ruffian_mv,
	};

	static struct alpha_machine_vector *api_vecs[] __initdata =
	{
		NULL,		/* 200 */
		&nautilus_mv,
	};

	static struct alpha_machine_vector *alcor_vecs[] __initdata = 
	{
		&alcor_mv, &xlt_mv, &xlt_mv
	};

	static struct alpha_machine_vector *eb164_vecs[] __initdata =
	{
		&eb164_mv, &pc164_mv, &lx164_mv, &sx164_mv, &rx164_mv
	};

	static struct alpha_machine_vector *eb64p_vecs[] __initdata =
	{
		&eb64p_mv,
		&cabriolet_mv,
		&cabriolet_mv		/* AlphaPCI64 */
	};

	static struct alpha_machine_vector *eb66_vecs[] __initdata =
	{
		&eb66_mv,
		&eb66p_mv
	};

	static struct alpha_machine_vector *titan_vecs[] __initdata =
	{
		NULL,
		&privateer_mv,		/* privateer */
	};

	static struct alpha_machine_vector *tsunami_vecs[]  __initdata =
	{
		NULL,
		&dp264_mv,		/* dp264 */
		&dp264_mv,		/* warhol */
		&dp264_mv,		/* windjammer */
		&monet_mv,		/* monet */
		&clipper_mv,		/* clipper */
		&dp264_mv,		/* goldrush */
		&webbrick_mv,		/* webbrick */
		&dp264_mv,		/* catamaran */
	};

	/* ??? Do we need to distinguish between Rawhides?  */

	struct alpha_machine_vector *vec;

	/* Restore real CABRIO and EB66+ family names, ie EB64+ and EB66 */
	if (type < 0)
		type = -type;

	/* Search the system tables first... */
	vec = NULL;
	if (type < N(systype_vecs)) {
		vec = systype_vecs[type];
	} else if ((type > ST_API_BIAS) &&
		   (type - ST_API_BIAS) < N(api_vecs)) {
		vec = api_vecs[type - ST_API_BIAS];
	} else if ((type > ST_UNOFFICIAL_BIAS) &&
		   (type - ST_UNOFFICIAL_BIAS) < N(unofficial_vecs)) {
		vec = unofficial_vecs[type - ST_UNOFFICIAL_BIAS];
	}

	/* If we've not found one, try for a variation.  */

	if (!vec) {
		/* Member ID is a bit-field. */
		long member = (variation >> 10) & 0x3f;

		switch (type) {
		case ST_DEC_ALCOR:
			if (member < N(alcor_indices))
				vec = alcor_vecs[alcor_indices[member]];
			break;
		case ST_DEC_EB164:
			if (member < N(eb164_indices))
				vec = eb164_vecs[eb164_indices[member]];
			break;
		case ST_DEC_EB64P:
			if (member < N(eb64p_indices))
				vec = eb64p_vecs[eb64p_indices[member]];
			break;
		case ST_DEC_EB66:
			if (member < N(eb66_indices))
				vec = eb66_vecs[eb66_indices[member]];
			break;
		case ST_DEC_TITAN:
			if (member < N(titan_indices))
				vec = titan_vecs[titan_indices[member]];
			break;
		case ST_DEC_TSUNAMI:
			if (member < N(tsunami_indices))
				vec = tsunami_vecs[tsunami_indices[member]];
			break;
		case ST_DEC_1000:
			cpu &= 0xffffffff;
			if (cpu == EV5_CPU || cpu == EV56_CPU)
				vec = &mikasa_primo_mv;
			else
				vec = &mikasa_mv;
			break;
		case ST_DEC_NORITAKE:
			cpu &= 0xffffffff;
			if (cpu == EV5_CPU || cpu == EV56_CPU)
				vec = &noritake_primo_mv;
			else
				vec = &noritake_mv;
			break;
		case ST_DEC_2100_A500:
			cpu &= 0xffffffff;
			if (cpu == EV5_CPU || cpu == EV56_CPU)
				vec = &sable_gamma_mv;
			else
				vec = &sable_mv;
			break;
		}
	}
	return vec;
}

static struct alpha_machine_vector * __init
get_sysvec_byname(const char *name)
{
	static struct alpha_machine_vector *all_vecs[] __initdata =
	{
		&alcor_mv,
		&alphabook1_mv,
		&avanti_mv,
		&cabriolet_mv,
		&clipper_mv,
		&dp264_mv,
		&eb164_mv,
		&eb64p_mv,
		&eb66_mv,
		&eb66p_mv,
		&eiger_mv,
		&jensen_mv,
		&lx164_mv,
		&miata_mv,
		&mikasa_mv,
		&mikasa_primo_mv,
		&monet_mv,
		&nautilus_mv,
		&noname_mv,
		&noritake_mv,
		&noritake_primo_mv,
		&p2k_mv,
		&pc164_mv,
		&privateer_mv,
		&rawhide_mv,
		&ruffian_mv,
		&rx164_mv,
		&sable_mv,
		&sable_gamma_mv,
		&sx164_mv,
		&takara_mv,
		&webbrick_mv,
		&wildfire_mv,
		&xl_mv,
		&xlt_mv
	};

	int i, n = sizeof(all_vecs)/sizeof(*all_vecs);
	for (i = 0; i < n; ++i) {
		struct alpha_machine_vector *mv = all_vecs[i];
		if (strcasecmp(mv->vector_name, name) == 0)
			return mv;
	}
	return NULL;
}

static void
get_sysnames(long type, long variation,
	     char **type_name, char **variation_name)
{
	long member;

	/* Restore real CABRIO and EB66+ family names, ie EB64+ and EB66 */
	if (type < 0)
		type = -type;

	/* If not in the tables, make it UNKNOWN,
	   else set type name to family */
	if (type < N(systype_names)) {
		*type_name = systype_names[type];
	} else if ((type > ST_API_BIAS) &&
		   (type - ST_API_BIAS) < N(api_names)) {
		*type_name = api_names[type - ST_API_BIAS];
	} else if ((type > ST_UNOFFICIAL_BIAS) &&
		   (type - ST_UNOFFICIAL_BIAS) < N(unofficial_names)) {
		*type_name = unofficial_names[type - ST_UNOFFICIAL_BIAS];
	} else {
		*type_name = sys_unknown;
		*variation_name = sys_unknown;
		return;
	}

	/* Set variation to "0"; if variation is zero, done */
	*variation_name = systype_names[0];
	if (variation == 0) {
		return;
	}

	member = (variation >> 10) & 0x3f; /* member ID is a bit-field */

	switch (type) { /* select by family */
	default: /* default to variation "0" for now */
		break;
	case ST_DEC_EB164:
		if (member < N(eb164_indices))
			*variation_name = eb164_names[eb164_indices[member]];
		break;
	case ST_DEC_ALCOR:
		if (member < N(alcor_indices))
			*variation_name = alcor_names[alcor_indices[member]];
		break;
	case ST_DEC_EB64P:
		if (member < N(eb64p_indices))
			*variation_name = eb64p_names[eb64p_indices[member]];
		break;
	case ST_DEC_EB66:
		if (member < N(eb66_indices))
			*variation_name = eb66_names[eb66_indices[member]];
		break;
	case ST_DEC_RAWHIDE:
		if (member < N(rawhide_indices))
			*variation_name = rawhide_names[rawhide_indices[member]];
		break;
	case ST_DEC_TITAN:
		if (member < N(titan_indices))
			*variation_name = titan_names[titan_indices[member]];
		break;
	case ST_DEC_TSUNAMI:
		if (member < N(tsunami_indices))
			*variation_name = tsunami_names[tsunami_indices[member]];
		break;
	}
}

/*
 * A change was made to the HWRPB via an ECO and the following code
 * tracks a part of the ECO.  In HWRPB versions less than 5, the ECO
 * was not implemented in the console firmware.  If it's revision 5 or
 * greater we can get the name of the platform as an ASCII string from
 * the HWRPB.  That's what this function does.  It checks the revision
 * level and if the string is in the HWRPB it returns the address of
 * the string--a pointer to the name of the platform.
 *
 * Returns:
 *      - Pointer to a ASCII string if it's in the HWRPB
 *      - Pointer to a blank string if the data is not in the HWRPB.
 */

static char *
platform_string(void)
{
	struct dsr_struct *dsr;
	static char unk_system_string[] = "N/A";

	/* Go to the console for the string pointer.
	 * If the rpb_vers is not 5 or greater the rpb
	 * is old and does not have this data in it.
	 */
	if (hwrpb->revision < 5)
		return (unk_system_string);
	else {
		/* The Dynamic System Recognition struct
		 * has the system platform name starting
		 * after the character count of the string.
		 */
		dsr =  ((struct dsr_struct *)
			((char *)hwrpb + hwrpb->dsr_offset));
		return ((char *)dsr + (dsr->sysname_off +
				       sizeof(long)));
	}
}

static int
get_nr_processors(struct percpu_struct *cpubase, unsigned long num)
{
	struct percpu_struct *cpu;
	int i, count = 0;

	for (i = 0; i < num; i++) {
		cpu = (struct percpu_struct *)
			((char *)cpubase + i*hwrpb->processor_size);
		if ((cpu->flags & 0x1cc) == 0x1cc)
			count++;
	}
	return count;
}


/*
 * BUFFER is PAGE_SIZE bytes long.
 */
int get_cpuinfo(char *buffer)
{
	extern struct unaligned_stat {
		unsigned long count, va, pc;
	} unaligned[2];

	static char cpu_names[][8] = {
		"EV3", "EV4", "Simulate", "LCA4", "EV5", "EV45", "EV56",
		"EV6", "PCA56", "PCA57", "EV67", "EV68CB", "EV68AL"
	};

	struct percpu_struct *cpu;
	unsigned int cpu_index;
	char *cpu_name;
	char *systype_name;
	char *sysvariation_name;
	int len, nr_processors;

	cpu = (struct percpu_struct*)((char*)hwrpb + hwrpb->processor_offset);
	cpu_index = (unsigned) (cpu->type - 1);
	cpu_name = "Unknown";
	if (cpu_index < N(cpu_names))
		cpu_name = cpu_names[cpu_index];

	get_sysnames(hwrpb->sys_type, hwrpb->sys_variation,
		     &systype_name, &sysvariation_name);

	nr_processors = get_nr_processors(cpu, hwrpb->nr_processors);

	len = sprintf(buffer,
		      "cpu\t\t\t: Alpha\n"
		      "cpu model\t\t: %s\n"
		      "cpu variation\t\t: %ld\n"
		      "cpu revision\t\t: %ld\n"
		      "cpu serial number\t: %s\n"
		      "system type\t\t: %s\n"
		      "system variation\t: %s\n"
		      "system revision\t\t: %ld\n"
		      "system serial number\t: %s\n"
		      "cycle frequency [Hz]\t: %lu %s\n"
		      "timer frequency [Hz]\t: %lu.%02lu\n"
		      "page size [bytes]\t: %ld\n"
		      "phys. address bits\t: %ld\n"
		      "max. addr. space #\t: %ld\n"
		      "BogoMIPS\t\t: %lu.%02lu\n"
		      "kernel unaligned acc\t: %ld (pc=%lx,va=%lx)\n"
		      "user unaligned acc\t: %ld (pc=%lx,va=%lx)\n"
		      "platform string\t\t: %s\n"
		      "cpus detected\t\t: %d\n",
		       cpu_name, cpu->variation, cpu->revision,
		       (char*)cpu->serial_no,
		       systype_name, sysvariation_name, hwrpb->sys_revision,
		       (char*)hwrpb->ssn,
		       est_cycle_freq ? : hwrpb->cycle_freq,
		       est_cycle_freq ? "est." : "",
		       hwrpb->intr_freq / 4096,
		       (100 * hwrpb->intr_freq / 4096) % 100,
		       hwrpb->pagesize,
		       hwrpb->pa_bits,
		       hwrpb->max_asn,
		       loops_per_jiffy / (500000/HZ),
		       (loops_per_jiffy / (5000/HZ)) % 100,
		       unaligned[0].count, unaligned[0].pc, unaligned[0].va,
		       unaligned[1].count, unaligned[1].pc, unaligned[1].va,
		       platform_string(), nr_processors);

#ifdef CONFIG_SMP
	len += smp_info(buffer+len);
#endif

	return len;
}

static int alpha_panic_event(struct notifier_block *this,
			     unsigned long event,
			     void *ptr)
{
#if 1
	/* FIXME FIXME FIXME */
	/* If we are using SRM and serial console, just hard halt here. */
	if (alpha_using_srm && srmcons_output)
		__halt();
#endif
        return NOTIFY_DONE;
}