setup.c

一个2.4.21版本的嵌入式linux内核

		} else if (start < end_kernel_pfn)
			start = end_kernel_pfn;
		if (start >= end)
			continue;

		free_bootmem(PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
		printk("freeing pages %ld:%ld\n", start, end);
	}

	/* Reserve the bootmap memory.  */
	reserve_bootmem(PFN_PHYS(bootmap_start), bootmap_size);
	printk("reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));

#ifdef CONFIG_BLK_DEV_INITRD
	initrd_start = INITRD_START;
	if (initrd_start) {
		initrd_end = initrd_start+INITRD_SIZE;
		printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
		       (void *) initrd_start, INITRD_SIZE);

		if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
			if (!move_initrd(PFN_PHYS(max_low_pfn)))
				printk("initrd extends beyond end of memory "
				       "(0x%08lx > 0x%p)\ndisabling initrd\n",
				       initrd_end,
				       phys_to_virt(PFN_PHYS(max_low_pfn)));
		} else {
			reserve_bootmem(virt_to_phys((void *)initrd_start),
					INITRD_SIZE);
		}
	}
#endif /* CONFIG_BLK_DEV_INITRD */
}
#else
extern void setup_memory(void *);
#endif /* !CONFIG_DISCONTIGMEM */

int __init
page_is_ram(unsigned long pfn)
{
	struct memclust_struct * cluster;
	struct memdesc_struct * memdesc;
	int i;

	memdesc = (struct memdesc_struct *)
		(hwrpb->mddt_offset + (unsigned long) hwrpb);
	for_each_mem_cluster(memdesc, cluster, i)
	{
		if (pfn >= cluster->start_pfn  &&
		    pfn < cluster->start_pfn + cluster->numpages) {
			return (cluster->usage & 3) ? 0 : 1;
		}
	}

	return 0;
}

#undef PFN_UP
#undef PFN_DOWN
#undef PFN_PHYS
#undef PFN_MAX

void __init
setup_arch(char **cmdline_p)
{
	extern char _end[];

	struct alpha_machine_vector *vec = NULL;
	struct percpu_struct *cpu;
	char *type_name, *var_name, *p;
	void *kernel_end = _end; /* end of kernel */

	hwrpb = (struct hwrpb_struct*) __va(INIT_HWRPB->phys_addr);
	boot_cpuid = hard_smp_processor_id();

	/* Register a call for panic conditions. */
	notifier_chain_register(&panic_notifier_list, &alpha_panic_block);

#ifdef CONFIG_ALPHA_GENERIC
	/* Assume that we've booted from SRM if we havn't booted from MILO.
	   Detect the later by looking for "MILO" in the system serial nr.  */
	alpha_using_srm = strncmp((const char *)hwrpb->ssn, "MILO", 4) != 0;
#endif

	/* If we are using SRM, we want to allow callbacks
	   as early as possible, so do this NOW, and then
	   they should work immediately thereafter.
	*/
	kernel_end = callback_init(kernel_end);

	/* 
	 * Locate the command line.
	 */
	/* Hack for Jensen... since we're restricted to 8 or 16 chars for
	   boot flags depending on the boot mode, we need some shorthand.
	   This should do for installation.  */
	if (strcmp(COMMAND_LINE, "INSTALL") == 0) {
		strcpy(command_line, "root=/dev/fd0 load_ramdisk=1");
	} else {
		strncpy(command_line, COMMAND_LINE, sizeof command_line);
		command_line[sizeof(command_line)-1] = 0;
	}
	strcpy(saved_command_line, command_line);
	*cmdline_p = command_line;

	/* 
	 * Process command-line arguments.
	 */
	for (p = strtok(command_line, " \t"); p ; p = strtok(NULL, " \t")) {
		if (strncmp(p, "alpha_mv=", 9) == 0) {
			vec = get_sysvec_byname(p+9);
			continue;
		}
		if (strncmp(p, "cycle=", 6) == 0) {
			est_cycle_freq = simple_strtol(p+6, NULL, 0);
			continue;
		}
		if (strncmp(p, "mem=", 4) == 0) {
			mem_size_limit = get_mem_size_limit(p+4);
			continue;
		}
		if (strncmp(p, "srmcons", 7) == 0) {
			srmcons_output |= 1;
			continue;
		}
		if (strncmp(p, "console=srm", 11) == 0) {
			srmcons_output |= 2;
			continue;
		}
		if (strncmp(p, "gartsize=", 9) == 0) {
			alpha_agpgart_size =
				get_mem_size_limit(p+9) << PAGE_SHIFT;
			continue;
		}
	}

	/* Replace the command line, now that we've killed it with strtok.  */
	strcpy(command_line, saved_command_line);

	/* If we want SRM console printk echoing early, do it now. */
	if (alpha_using_srm && srmcons_output) {
		register_srm_console();

		/*
		 * If "console=srm" was specified, clear the srmcons_output
		 * flag now so that time.c won't unregister_srm_console
		 */
		if (srmcons_output & 2)
			srmcons_output = 0;
	}

	/*
	 * Indentify and reconfigure for the current system.
	 */
	cpu = (struct percpu_struct*)((char*)hwrpb + hwrpb->processor_offset);

	get_sysnames(hwrpb->sys_type, hwrpb->sys_variation,
		     cpu->type, &type_name, &var_name);
	if (*var_name == '0')
		var_name = "";

	if (!vec) {
		vec = get_sysvec(hwrpb->sys_type, hwrpb->sys_variation,
				 cpu->type);
	}

	if (!vec) {
		panic("Unsupported system type: %s%s%s (%ld %ld)\n",
		      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();
}

void __init
disable_early_printk(void)
{
	if (alpha_using_srm && srmcons_output) {
		unregister_srm_console();
		srmcons_output = 0;
	}
}

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", "Marvel"
};

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 marvel_names[][16] = {
	"Marvel/EV7"
};
static int marvel_indices[] = { 0 };

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] = {
	"DEFAULT", "Privateer", "Falcon", "Granite"
};
static int titan_indices[] = {0,1,2,2,3};

static char tsunami_names[][16] = {
	"0", "DP264", "Warhol", "Windjammer", "Monet", "Clipper",
	"Goldrush", "Webbrick", "Catamaran", "Brisbane", "Melbourne",
	"Flying Clipper", "Shark"
};
static int tsunami_indices[] = {0,1,2,3,4,5,6,7,8,9,10,11,12};

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 */
		NULL,		/* Marvel */
	};

	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 *marvel_vecs[] __initdata =
	{
		&marvel_ev7_mv,
	};

	static struct alpha_machine_vector *titan_vecs[] __initdata =
	{
		&titan_mv,		/* default   */
		&privateer_mv,		/* privateer */
		&titan_mv,		/* falcon    */
		&privateer_mv,		/* granite   */
	};

	static struct alpha_machine_vector *tsunami_vecs[]  __initdata =
	{
		NULL,