arch/sh/kernel/setup.c - kernel/msm-4.9 - Gitiles

 /*
  *  linux/arch/sh/kernel/setup.c
  *
  *  Copyright (C) 1999  Niibe Yutaka
  *  Copyright (C) 2002, 2003  Paul Mundt
  */

 /*
  * This file handles the architecture-dependent parts of initialization
  */

 #include <linux/screen_info.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/initrd.h>
 #include <linux/bootmem.h>
 #include <linux/console.h>
 #include <linux/seq_file.h>
 #include <linux/root_dev.h>
 #include <linux/utsname.h>
 #include <linux/cpu.h>
 #include <linux/pfn.h>
 #include <linux/fs.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <asm/sections.h>
 #include <asm/irq.h>
 #include <asm/setup.h>
 #include <asm/clock.h>

 #ifdef CONFIG_SH_KGDB
 #include <asm/kgdb.h>
 static int kgdb_parse_options(char *options);
 #endif
 extern void * __rd_start, * __rd_end;
 /*
  * Machine setup..
  */

 /*
  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  * This value will be used at the very early stage of serial setup.
  * The bigger value means no problem.
  */
 struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
 #ifdef CONFIG_VT
 struct screen_info screen_info;
 #endif

 #if defined(CONFIG_SH_UNKNOWN)
 struct sh_machine_vector sh_mv;
 #endif

 extern int root_mountflags;

 #define MV_NAME_SIZE 32

 static struct sh_machine_vector* __init get_mv_byname(const char* name);

 /*
  * This is set up by the setup-routine at boot-time
  */
 #define PARAM	((unsigned char *)empty_zero_page)

 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
 /* ... */
 #define COMMAND_LINE ((char *) (PARAM+0x100))

 #define RAMDISK_IMAGE_START_MASK	0x07FF
 #define RAMDISK_PROMPT_FLAG		0x8000
 #define RAMDISK_LOAD_FLAG		0x4000

 static char command_line[COMMAND_LINE_SIZE] = { 0, };

 static struct resource code_resource = { .name = "Kernel code", };
 static struct resource data_resource = { .name = "Kernel data", };

 unsigned long memory_start, memory_end;

 static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
 				  struct sh_machine_vector** mvp,
 				  unsigned long *mv_io_base,
 				  int *mv_mmio_enable)
 {
 	char c = ' ', *to = command_line, *from = COMMAND_LINE;
 	int len = 0;

 	/* Save unparsed command line copy for /proc/cmdline */
 	memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
 	saved_command_line[COMMAND_LINE_SIZE-1] = '\0';

 	memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 	memory_end = memory_start + __MEMORY_SIZE;

 	for (;;) {
 		/*
 		 * "mem=XXX[kKmM]" defines a size of memory.
 		 */
 		if (c == ' ' && !memcmp(from, "mem=", 4)) {
 			if (to != command_line)
 				to--;
 			{
 				unsigned long mem_size;

 				mem_size = memparse(from+4, &from);
 				memory_end = memory_start + mem_size;
 			}
 		}

 #ifdef CONFIG_EARLY_PRINTK
 		if (c == ' ' && !memcmp(from, "earlyprintk=", 12)) {
 			char *ep_end;

 			if (to != command_line)
 				to--;

 			from += 12;
 			ep_end = strchr(from, ' ');

 			setup_early_printk(from);
 			printk("early console enabled\n");

 			from = ep_end;
 		}
 #endif

 		if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
 			char* mv_end;
 			char* mv_comma;
 			int mv_len;
 			if (to != command_line)
 				to--;
 			from += 6;
 			mv_end = strchr(from, ' ');
 			if (mv_end == NULL)
 				mv_end = from + strlen(from);

 			mv_comma = strchr(from, ',');
 			if ((mv_comma != NULL) && (mv_comma < mv_end)) {
 				int ints[3];
 				get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
 				*mv_io_base = ints[1];
 				*mv_mmio_enable = ints[2];
 				mv_len = mv_comma - from;
 			} else {
 				mv_len = mv_end - from;
 			}
 			if (mv_len > (MV_NAME_SIZE-1))
 				mv_len = MV_NAME_SIZE-1;
 			memcpy(mv_name, from, mv_len);
 			mv_name[mv_len] = '\0';
 			from = mv_end;

 			*mvp = get_mv_byname(mv_name);
 		}
 		c = *(from++);
 		if (!c)
 			break;
 		if (COMMAND_LINE_SIZE <= ++len)
 			break;
 		*(to++) = c;
 	}
 	*to = '\0';
 	*cmdline_p = command_line;
 }

 static int __init sh_mv_setup(char **cmdline_p)
 {
 #ifdef CONFIG_SH_UNKNOWN
 	extern struct sh_machine_vector mv_unknown;
 #endif
 	struct sh_machine_vector *mv = NULL;
 	char mv_name[MV_NAME_SIZE] = "";
 	unsigned long mv_io_base = 0;
 	int mv_mmio_enable = 0;

 	parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base, &mv_mmio_enable);

 #ifdef CONFIG_SH_UNKNOWN
 	if (mv == NULL) {
 		mv = &mv_unknown;
 		if (*mv_name != '\0') {
 			printk("Warning: Unsupported machine %s, using unknown\n",
 			       mv_name);
 		}
 	}
 	sh_mv = *mv;
 #endif

 	/*
 	 * Manually walk the vec, fill in anything that the board hasn't yet
 	 * by hand, wrapping to the generic implementation.
 	 */
 #define mv_set(elem) do { \
 	if (!sh_mv.mv_##elem) \
 		sh_mv.mv_##elem = generic_##elem; \
 } while (0)

 	mv_set(inb);	mv_set(inw);	mv_set(inl);
 	mv_set(outb);	mv_set(outw);	mv_set(outl);

 	mv_set(inb_p);	mv_set(inw_p);	mv_set(inl_p);
 	mv_set(outb_p);	mv_set(outw_p);	mv_set(outl_p);

 	mv_set(insb);	mv_set(insw);	mv_set(insl);
 	mv_set(outsb);	mv_set(outsw);	mv_set(outsl);

 	mv_set(readb);	mv_set(readw);	mv_set(readl);
 	mv_set(writeb);	mv_set(writew);	mv_set(writel);

 	mv_set(ioport_map);
 	mv_set(ioport_unmap);
 	mv_set(irq_demux);

 #ifdef CONFIG_SH_UNKNOWN
 	__set_io_port_base(mv_io_base);
 #endif

 	if (!sh_mv.mv_nr_irqs)
 		sh_mv.mv_nr_irqs = NR_IRQS;

 	return 0;
 }

 void __init setup_arch(char **cmdline_p)
 {
 	unsigned long bootmap_size;
 	unsigned long start_pfn, max_pfn, max_low_pfn;

 #ifdef CONFIG_CMDLINE_BOOL
         strcpy(COMMAND_LINE, CONFIG_CMDLINE);
 #endif

 	ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);

 #ifdef CONFIG_BLK_DEV_RAM
 	rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 	rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 	rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 #endif

 	if (!MOUNT_ROOT_RDONLY)
 		root_mountflags &= ~MS_RDONLY;
 	init_mm.start_code = (unsigned long) _text;
 	init_mm.end_code = (unsigned long) _etext;
 	init_mm.end_data = (unsigned long) _edata;
 	init_mm.brk = (unsigned long) _end;

 	code_resource.start = (unsigned long)virt_to_phys(_text);
 	code_resource.end = (unsigned long)virt_to_phys(_etext)-1;
 	data_resource.start = (unsigned long)virt_to_phys(_etext);
 	data_resource.end = (unsigned long)virt_to_phys(_edata)-1;

 	sh_mv_setup(cmdline_p);

 	/*
 	 * Find the highest page frame number we have available
 	 */
 	max_pfn = PFN_DOWN(__pa(memory_end));

 	/*
 	 * Determine low and high memory ranges:
 	 */
 	max_low_pfn = max_pfn;

 	/*
 	 * Partially used pages are not usable - thus
 	 * we are rounding upwards:
 	 */
 	start_pfn = PFN_UP(__pa(_end));

 	/*
 	 * Find a proper area for the bootmem bitmap. After this
 	 * bootstrap step all allocations (until the page allocator
 	 * is intact) must be done via bootmem_alloc().
 	 */
 	bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
 					 __MEMORY_START>>PAGE_SHIFT,
 					 max_low_pfn);
 	/*
 	 * Register fully available low RAM pages with the bootmem allocator.
 	 */
 	{
 		unsigned long curr_pfn, last_pfn, pages;

 		/*
 		 * We are rounding up the start address of usable memory:
 		 */
 		curr_pfn = PFN_UP(__MEMORY_START);
 		/*
 		 * ... and at the end of the usable range downwards:
 		 */
 		last_pfn = PFN_DOWN(__pa(memory_end));

 		if (last_pfn > max_low_pfn)
 			last_pfn = max_low_pfn;

 		pages = last_pfn - curr_pfn;
 		free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
 				  PFN_PHYS(pages));
 	}

 	/*
 	 * Reserve the kernel text and
 	 * Reserve the bootmem bitmap. We do this in two steps (first step
 	 * was init_bootmem()), because this catches the (definitely buggy)
 	 * case of us accidentally initializing the bootmem allocator with
 	 * an invalid RAM area.
 	 */
 	reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
 		(PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);

 	/*
 	 * reserve physical page 0 - it's a special BIOS page on many boxes,
 	 * enabling clean reboots, SMP operation, laptop functions.
 	 */
 	reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);

 #ifdef CONFIG_BLK_DEV_INITRD
 	ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 	if (&__rd_start != &__rd_end) {
 		LOADER_TYPE = 1;
 		INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START;
 		INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start;
 	}

 	if (LOADER_TYPE && INITRD_START) {
 		if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 			reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE);
 			initrd_start = INITRD_START + PAGE_OFFSET + __MEMORY_START;
 			initrd_end = initrd_start + INITRD_SIZE;
 		} else {
 			printk("initrd extends beyond end of memory "
 			    "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 				    INITRD_START + INITRD_SIZE,
 				    max_low_pfn << PAGE_SHIFT);
 			initrd_start = 0;
 		}
 	}
 #endif

 #ifdef CONFIG_DUMMY_CONSOLE
 	conswitchp = &dummy_con;
 #endif

 	/* Perform the machine specific initialisation */
 	if (likely(sh_mv.mv_setup))
 		sh_mv.mv_setup(cmdline_p);

 	paging_init();
 }

 struct sh_machine_vector* __init get_mv_byname(const char* name)
 {
 	extern long __machvec_start, __machvec_end;
 	struct sh_machine_vector *all_vecs =
 		(struct sh_machine_vector *)&__machvec_start;

 	int i, n = ((unsigned long)&__machvec_end
 		    - (unsigned long)&__machvec_start)/
 		sizeof(struct sh_machine_vector);

 	for (i = 0; i < n; ++i) {
 		struct sh_machine_vector *mv = &all_vecs[i];
 		if (mv == NULL)
 			continue;
 		if (strcasecmp(name, get_system_type()) == 0) {
 			return mv;
 		}
 	}
 	return NULL;
 }

 static struct cpu cpu[NR_CPUS];

 static int __init topology_init(void)
 {
 	int cpu_id;

 	for_each_possible_cpu(cpu_id)
 		register_cpu(&cpu[cpu_id], cpu_id);

 	return 0;
 }

 subsys_initcall(topology_init);

 static const char *cpu_name[] = {
 	[CPU_SH7206]	= "SH7206",	[CPU_SH7619]	= "SH7619",
 	[CPU_SH7604]	= "SH7604",	[CPU_SH7300]	= "SH7300",
 	[CPU_SH7705]	= "SH7705",	[CPU_SH7706]	= "SH7706",
 	[CPU_SH7707]	= "SH7707",	[CPU_SH7708]	= "SH7708",
 	[CPU_SH7709]	= "SH7709",	[CPU_SH7710]	= "SH7710",
 	[CPU_SH7729]	= "SH7729",	[CPU_SH7750]	= "SH7750",
 	[CPU_SH7750S]	= "SH7750S",	[CPU_SH7750R]	= "SH7750R",
 	[CPU_SH7751]	= "SH7751",	[CPU_SH7751R]	= "SH7751R",
 	[CPU_SH7760]	= "SH7760",	[CPU_SH73180]	= "SH73180",
 	[CPU_ST40RA]	= "ST40RA",	[CPU_ST40GX1]	= "ST40GX1",
 	[CPU_SH4_202]	= "SH4-202",	[CPU_SH4_501]	= "SH4-501",
 	[CPU_SH7770]	= "SH7770",	[CPU_SH7780]	= "SH7780",
 	[CPU_SH7781]	= "SH7781",	[CPU_SH7343]	= "SH7343",
 	[CPU_SH7785]	= "SH7785",
 	[CPU_SH_NONE]	= "Unknown"
 };

 const char *get_cpu_subtype(void)
 {
 	return cpu_name[boot_cpu_data.type];
 }

 #ifdef CONFIG_PROC_FS
 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 static const char *cpu_flags[] = {
 	"none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 	"ptea", "llsc", "l2", NULL
 };

 static void show_cpuflags(struct seq_file *m)
 {
 	unsigned long i;

 	seq_printf(m, "cpu flags\t:");

 	if (!cpu_data->flags) {
 		seq_printf(m, " %s\n", cpu_flags[0]);
 		return;
 	}

 	for (i = 0; cpu_flags[i]; i++)
 		if ((cpu_data->flags & (1 << i)))
 			seq_printf(m, " %s", cpu_flags[i+1]);

 	seq_printf(m, "\n");
 }

 static void show_cacheinfo(struct seq_file *m, const char *type,
 			   struct cache_info info)
 {
 	unsigned int cache_size;

 	cache_size = info.ways * info.sets * info.linesz;

 	seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 		   type, cache_size >> 10, info.ways);
 }

 /*
  *	Get CPU information for use by the procfs.
  */
 static int show_cpuinfo(struct seq_file *m, void *v)
 {
 	unsigned int cpu = smp_processor_id();

 	if (!cpu && cpu_online(cpu))
 		seq_printf(m, "machine\t\t: %s\n", get_system_type());

 	seq_printf(m, "processor\t: %d\n", cpu);
 	seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 	seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype());

 	show_cpuflags(m);

 	seq_printf(m, "cache type\t: ");

 	/*
 	 * Check for what type of cache we have, we support both the
 	 * unified cache on the SH-2 and SH-3, as well as the harvard
 	 * style cache on the SH-4.
 	 */
 	if (boot_cpu_data.icache.flags & SH_CACHE_COMBINED) {
 		seq_printf(m, "unified\n");
 		show_cacheinfo(m, "cache", boot_cpu_data.icache);
 	} else {
 		seq_printf(m, "split (harvard)\n");
 		show_cacheinfo(m, "icache", boot_cpu_data.icache);
 		show_cacheinfo(m, "dcache", boot_cpu_data.dcache);
 	}

 	/* Optional secondary cache */
 	if (boot_cpu_data.flags & CPU_HAS_L2_CACHE)
 		show_cacheinfo(m, "scache", boot_cpu_data.scache);

 	seq_printf(m, "bogomips\t: %lu.%02lu\n",
 		     boot_cpu_data.loops_per_jiffy/(500000/HZ),
 		     (boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100);

 	return show_clocks(m);
 }

 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,
 };
 #endif /* CONFIG_PROC_FS */

 #ifdef CONFIG_SH_KGDB
 /*
  * Parse command-line kgdb options.  By default KGDB is enabled,
  * entered on error (or other action) using default serial info.
  * The command-line option can include a serial port specification
  * and an action to override default or configured behavior.
  */
 struct kgdb_sermap kgdb_sci_sermap =
 { "ttySC", 5, kgdb_sci_setup, NULL };

 struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap;
 struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap;

 void kgdb_register_sermap(struct kgdb_sermap *map)
 {
 	struct kgdb_sermap *last;

 	for (last = kgdb_serlist; last->next; last = last->next)
 		;
 	last->next = map;
 	if (!map->namelen) {
 		map->namelen = strlen(map->name);
 	}
 }

 static int __init kgdb_parse_options(char *options)
 {
 	char c;
 	int baud;

 	/* Check for port spec (or use default) */

 	/* Determine port type and instance */
 	if (!memcmp(options, "tty", 3)) {
 		struct kgdb_sermap *map = kgdb_serlist;

 		while (map && memcmp(options, map->name, map->namelen))
 			map = map->next;

 		if (!map) {
 			KGDB_PRINTK("unknown port spec in %s\n", options);
 			return -1;
 		}

 		kgdb_porttype = map;
 		kgdb_serial_setup = map->setup_fn;
 		kgdb_portnum = options[map->namelen] - '0';
 		options += map->namelen + 1;

 		options = (*options == ',') ? options+1 : options;

 		/* Read optional parameters (baud/parity/bits) */
 		baud = simple_strtoul(options, &options, 10);
 		if (baud != 0) {
 			kgdb_baud = baud;

 			c = toupper(*options);
 			if (c == 'E' || c == 'O' || c == 'N') {
 				kgdb_parity = c;
 				options++;
 			}

 			c = *options;
 			if (c == '7' || c == '8') {
 				kgdb_bits = c;
 				options++;
 			}
 			options = (*options == ',') ? options+1 : options;
 		}
 	}

 	/* Check for action specification */
 	if (!memcmp(options, "halt", 4)) {
 		kgdb_halt = 1;
 		options += 4;
 	} else if (!memcmp(options, "disabled", 8)) {
 		kgdb_enabled = 0;
 		options += 8;
 	}

 	if (*options) {
                 KGDB_PRINTK("ignored unknown options: %s\n", options);
 		return 0;
 	}
 	return 1;
 }
 __setup("kgdb=", kgdb_parse_options);
 #endif /* CONFIG_SH_KGDB */
	/*
	* linux/arch/sh/kernel/setup.c
	*
	* Copyright (C) 1999 Niibe Yutaka
	* Copyright (C) 2002, 2003 Paul Mundt
	*/

	/*
	* This file handles the architecture-dependent parts of initialization
	*/

	#include <linux/screen_info.h>
	#include <linux/ioport.h>
	#include <linux/init.h>
	#include <linux/initrd.h>
	#include <linux/bootmem.h>
	#include <linux/console.h>
	#include <linux/seq_file.h>
	#include <linux/root_dev.h>
	#include <linux/utsname.h>
	#include <linux/cpu.h>
	#include <linux/pfn.h>
	#include <linux/fs.h>
	#include <asm/uaccess.h>
	#include <asm/io.h>
	#include <asm/sections.h>
	#include <asm/irq.h>
	#include <asm/setup.h>
	#include <asm/clock.h>

	#ifdef CONFIG_SH_KGDB
	#include <asm/kgdb.h>
	static int kgdb_parse_options(char *options);
	#endif
	extern void * __rd_start, * __rd_end;
	/*
	* Machine setup..
	*/

	/*
	* Initialize loops_per_jiffy as 10000000 (1000MIPS).
	* This value will be used at the very early stage of serial setup.
	* The bigger value means no problem.
	*/
	struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
	#ifdef CONFIG_VT
	struct screen_info screen_info;
	#endif

	#if defined(CONFIG_SH_UNKNOWN)
	struct sh_machine_vector sh_mv;
	#endif

	extern int root_mountflags;

	#define MV_NAME_SIZE 32

	static struct sh_machine_vector* __init get_mv_byname(const char* name);

	/*
	* This is set up by the setup-routine at boot-time
	*/
	#define PARAM ((unsigned char *)empty_zero_page)

	#define MOUNT_ROOT_RDONLY ((unsigned long ) (PARAM+0x000))
	#define RAMDISK_FLAGS ((unsigned long ) (PARAM+0x004))
	#define ORIG_ROOT_DEV ((unsigned long ) (PARAM+0x008))
	#define LOADER_TYPE ((unsigned long ) (PARAM+0x00c))
	#define INITRD_START ((unsigned long ) (PARAM+0x010))
	#define INITRD_SIZE ((unsigned long ) (PARAM+0x014))
	/* ... */
	#define COMMAND_LINE ((char *) (PARAM+0x100))

	#define RAMDISK_IMAGE_START_MASK 0x07FF
	#define RAMDISK_PROMPT_FLAG 0x8000
	#define RAMDISK_LOAD_FLAG 0x4000

	static char command_line[COMMAND_LINE_SIZE] = { 0, };

	static struct resource code_resource = { .name = "Kernel code", };
	static struct resource data_resource = { .name = "Kernel data", };

	unsigned long memory_start, memory_end;

	static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
	struct sh_machine_vector** mvp,
	unsigned long *mv_io_base,
	int *mv_mmio_enable)
	{
	char c = ' ', to = command_line, from = COMMAND_LINE;
	int len = 0;

	/* Save unparsed command line copy for /proc/cmdline */
	memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
	saved_command_line[COMMAND_LINE_SIZE-1] = '\0';

	memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
	memory_end = memory_start + __MEMORY_SIZE;

	for (;;) {
	/*
	* "mem=XXX[kKmM]" defines a size of memory.
	*/
	if (c == ' ' && !memcmp(from, "mem=", 4)) {
	if (to != command_line)
	to--;
	{
	unsigned long mem_size;

	mem_size = memparse(from+4, &from);
	memory_end = memory_start + mem_size;
	}
	}

	#ifdef CONFIG_EARLY_PRINTK
	if (c == ' ' && !memcmp(from, "earlyprintk=", 12)) {
	char *ep_end;

	if (to != command_line)
	to--;

	from += 12;
	ep_end = strchr(from, ' ');

	setup_early_printk(from);
	printk("early console enabled\n");

	from = ep_end;
	}
	#endif

	if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
	char* mv_end;
	char* mv_comma;
	int mv_len;
	if (to != command_line)
	to--;
	from += 6;
	mv_end = strchr(from, ' ');
	if (mv_end == NULL)
	mv_end = from + strlen(from);

	mv_comma = strchr(from, ',');
	if ((mv_comma != NULL) && (mv_comma < mv_end)) {
	int ints[3];
	get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
	*mv_io_base = ints[1];
	*mv_mmio_enable = ints[2];
	mv_len = mv_comma - from;
	} else {
	mv_len = mv_end - from;
	}
	if (mv_len > (MV_NAME_SIZE-1))
	mv_len = MV_NAME_SIZE-1;
	memcpy(mv_name, from, mv_len);
	mv_name[mv_len] = '\0';
	from = mv_end;

	*mvp = get_mv_byname(mv_name);
	}
	c = *(from++);
	if (!c)
	break;
	if (COMMAND_LINE_SIZE <= ++len)
	break;
	*(to++) = c;
	}
	*to = '\0';
	*cmdline_p = command_line;
	}

	static int __init sh_mv_setup(char **cmdline_p)
	{
	#ifdef CONFIG_SH_UNKNOWN
	extern struct sh_machine_vector mv_unknown;
	#endif
	struct sh_machine_vector *mv = NULL;
	char mv_name[MV_NAME_SIZE] = "";
	unsigned long mv_io_base = 0;
	int mv_mmio_enable = 0;

	parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base, &mv_mmio_enable);

	#ifdef CONFIG_SH_UNKNOWN
	if (mv == NULL) {
	mv = &mv_unknown;
	if (*mv_name != '\0') {
	printk("Warning: Unsupported machine %s, using unknown\n",
	mv_name);
	}
	}
	sh_mv = *mv;
	#endif

	/*
	* Manually walk the vec, fill in anything that the board hasn't yet
	* by hand, wrapping to the generic implementation.
	*/
	#define mv_set(elem) do { \
	if (!sh_mv.mv_##elem) \
	sh_mv.mv_##elem = generic_##elem; \
	} while (0)

	mv_set(inb); mv_set(inw); mv_set(inl);
	mv_set(outb); mv_set(outw); mv_set(outl);

	mv_set(inb_p); mv_set(inw_p); mv_set(inl_p);
	mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);

	mv_set(insb); mv_set(insw); mv_set(insl);
	mv_set(outsb); mv_set(outsw); mv_set(outsl);

	mv_set(readb); mv_set(readw); mv_set(readl);
	mv_set(writeb); mv_set(writew); mv_set(writel);

	mv_set(ioport_map);
	mv_set(ioport_unmap);
	mv_set(irq_demux);

	#ifdef CONFIG_SH_UNKNOWN
	__set_io_port_base(mv_io_base);
	#endif

	if (!sh_mv.mv_nr_irqs)
	sh_mv.mv_nr_irqs = NR_IRQS;

	return 0;
	}

	void __init setup_arch(char **cmdline_p)
	{
	unsigned long bootmap_size;
	unsigned long start_pfn, max_pfn, max_low_pfn;

	#ifdef CONFIG_CMDLINE_BOOL
	strcpy(COMMAND_LINE, CONFIG_CMDLINE);
	#endif

	ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);

	#ifdef CONFIG_BLK_DEV_RAM
	rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
	rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
	rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
	#endif

	if (!MOUNT_ROOT_RDONLY)
	root_mountflags &= ~MS_RDONLY;
	init_mm.start_code = (unsigned long) _text;
	init_mm.end_code = (unsigned long) _etext;
	init_mm.end_data = (unsigned long) _edata;
	init_mm.brk = (unsigned long) _end;

	code_resource.start = (unsigned long)virt_to_phys(_text);
	code_resource.end = (unsigned long)virt_to_phys(_etext)-1;
	data_resource.start = (unsigned long)virt_to_phys(_etext);
	data_resource.end = (unsigned long)virt_to_phys(_edata)-1;

	sh_mv_setup(cmdline_p);

	/*
	* Find the highest page frame number we have available
	*/
	max_pfn = PFN_DOWN(__pa(memory_end));

	/*
	* Determine low and high memory ranges:
	*/
	max_low_pfn = max_pfn;

	/*
	* Partially used pages are not usable - thus
	* we are rounding upwards:
	*/
	start_pfn = PFN_UP(__pa(_end));

	/*
	* Find a proper area for the bootmem bitmap. After this
	* bootstrap step all allocations (until the page allocator
	* is intact) must be done via bootmem_alloc().
	*/
	bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
	__MEMORY_START>>PAGE_SHIFT,
	max_low_pfn);
	/*
	* Register fully available low RAM pages with the bootmem allocator.
	*/
	{
	unsigned long curr_pfn, last_pfn, pages;

	/*
	* We are rounding up the start address of usable memory:
	*/
	curr_pfn = PFN_UP(__MEMORY_START);
	/*
	* ... and at the end of the usable range downwards:
	*/
	last_pfn = PFN_DOWN(__pa(memory_end));

	if (last_pfn > max_low_pfn)
	last_pfn = max_low_pfn;

	pages = last_pfn - curr_pfn;
	free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
	PFN_PHYS(pages));
	}

	/*
	* Reserve the kernel text and
	* Reserve the bootmem bitmap. We do this in two steps (first step
	* was init_bootmem()), because this catches the (definitely buggy)
	* case of us accidentally initializing the bootmem allocator with
	* an invalid RAM area.
	*/
	reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
	(PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);

	/*
	* reserve physical page 0 - it's a special BIOS page on many boxes,
	* enabling clean reboots, SMP operation, laptop functions.
	*/
	reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);

	#ifdef CONFIG_BLK_DEV_INITRD
	ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
	if (&__rd_start != &__rd_end) {
	LOADER_TYPE = 1;
	INITRD_START = PHYSADDR((unsigned long)&__rd_start) - __MEMORY_START;
	INITRD_SIZE = (unsigned long)&__rd_end - (unsigned long)&__rd_start;
	}

	if (LOADER_TYPE && INITRD_START) {
	if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
	reserve_bootmem_node(NODE_DATA(0), INITRD_START+__MEMORY_START, INITRD_SIZE);
	initrd_start = INITRD_START + PAGE_OFFSET + __MEMORY_START;
	initrd_end = initrd_start + INITRD_SIZE;
	} else {
	printk("initrd extends beyond end of memory "
	"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
	INITRD_START + INITRD_SIZE,
	max_low_pfn << PAGE_SHIFT);
	initrd_start = 0;
	}
	}
	#endif

	#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
	#endif

	/* Perform the machine specific initialisation */
	if (likely(sh_mv.mv_setup))
	sh_mv.mv_setup(cmdline_p);

	paging_init();
	}

	struct sh_machine_vector* __init get_mv_byname(const char* name)
	{
	extern long __machvec_start, __machvec_end;
	struct sh_machine_vector *all_vecs =
	(struct sh_machine_vector *)&__machvec_start;

	int i, n = ((unsigned long)&__machvec_end
	- (unsigned long)&__machvec_start)/
	sizeof(struct sh_machine_vector);

	for (i = 0; i < n; ++i) {
	struct sh_machine_vector *mv = &all_vecs[i];
	if (mv == NULL)
	continue;
	if (strcasecmp(name, get_system_type()) == 0) {
	return mv;
	}
	}
	return NULL;
	}

	static struct cpu cpu[NR_CPUS];

	static int __init topology_init(void)
	{
	int cpu_id;

	for_each_possible_cpu(cpu_id)
	register_cpu(&cpu[cpu_id], cpu_id);

	return 0;
	}

	subsys_initcall(topology_init);

	static const char *cpu_name[] = {
	[CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619",
	[CPU_SH7604] = "SH7604", [CPU_SH7300] = "SH7300",
	[CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706",
	[CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708",
	[CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710",
	[CPU_SH7729] = "SH7729", [CPU_SH7750] = "SH7750",
	[CPU_SH7750S] = "SH7750S", [CPU_SH7750R] = "SH7750R",
	[CPU_SH7751] = "SH7751", [CPU_SH7751R] = "SH7751R",
	[CPU_SH7760] = "SH7760", [CPU_SH73180] = "SH73180",
	[CPU_ST40RA] = "ST40RA", [CPU_ST40GX1] = "ST40GX1",
	[CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501",
	[CPU_SH7770] = "SH7770", [CPU_SH7780] = "SH7780",
	[CPU_SH7781] = "SH7781", [CPU_SH7343] = "SH7343",
	[CPU_SH7785] = "SH7785",
	[CPU_SH_NONE] = "Unknown"
	};

	const char *get_cpu_subtype(void)
	{
	return cpu_name[boot_cpu_data.type];
	}

	#ifdef CONFIG_PROC_FS
	/* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
	static const char *cpu_flags[] = {
	"none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
	"ptea", "llsc", "l2", NULL
	};

	static void show_cpuflags(struct seq_file *m)
	{
	unsigned long i;

	seq_printf(m, "cpu flags\t:");

	if (!cpu_data->flags) {
	seq_printf(m, " %s\n", cpu_flags[0]);
	return;
	}

	for (i = 0; cpu_flags[i]; i++)
	if ((cpu_data->flags & (1 << i)))
	seq_printf(m, " %s", cpu_flags[i+1]);

	seq_printf(m, "\n");
	}

	static void show_cacheinfo(struct seq_file m, const char type,
	struct cache_info info)
	{
	unsigned int cache_size;

	cache_size = info.ways * info.sets * info.linesz;

	seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
	type, cache_size >> 10, info.ways);
	}

	/*
	* Get CPU information for use by the procfs.
	*/
	static int show_cpuinfo(struct seq_file m, void v)
	{
	unsigned int cpu = smp_processor_id();

	if (!cpu && cpu_online(cpu))
	seq_printf(m, "machine\t\t: %s\n", get_system_type());

	seq_printf(m, "processor\t: %d\n", cpu);
	seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
	seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype());

	show_cpuflags(m);

	seq_printf(m, "cache type\t: ");

	/*
	* Check for what type of cache we have, we support both the
	* unified cache on the SH-2 and SH-3, as well as the harvard
	* style cache on the SH-4.
	*/
	if (boot_cpu_data.icache.flags & SH_CACHE_COMBINED) {
	seq_printf(m, "unified\n");
	show_cacheinfo(m, "cache", boot_cpu_data.icache);
	} else {
	seq_printf(m, "split (harvard)\n");
	show_cacheinfo(m, "icache", boot_cpu_data.icache);
	show_cacheinfo(m, "dcache", boot_cpu_data.dcache);
	}

	/* Optional secondary cache */
	if (boot_cpu_data.flags & CPU_HAS_L2_CACHE)
	show_cacheinfo(m, "scache", boot_cpu_data.scache);

	seq_printf(m, "bogomips\t: %lu.%02lu\n",
	boot_cpu_data.loops_per_jiffy/(500000/HZ),
	(boot_cpu_data.loops_per_jiffy/(5000/HZ)) % 100);

	return show_clocks(m);
	}

	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,
	};
	#endif /* CONFIG_PROC_FS */

	#ifdef CONFIG_SH_KGDB
	/*
	* Parse command-line kgdb options. By default KGDB is enabled,
	* entered on error (or other action) using default serial info.
	* The command-line option can include a serial port specification
	* and an action to override default or configured behavior.
	*/
	struct kgdb_sermap kgdb_sci_sermap =
	{ "ttySC", 5, kgdb_sci_setup, NULL };

	struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap;
	struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap;

	void kgdb_register_sermap(struct kgdb_sermap *map)
	{
	struct kgdb_sermap *last;

	for (last = kgdb_serlist; last->next; last = last->next)
	;
	last->next = map;
	if (!map->namelen) {
	map->namelen = strlen(map->name);
	}
	}

	static int __init kgdb_parse_options(char *options)
	{
	char c;
	int baud;

	/* Check for port spec (or use default) */

	/* Determine port type and instance */
	if (!memcmp(options, "tty", 3)) {
	struct kgdb_sermap *map = kgdb_serlist;

	while (map && memcmp(options, map->name, map->namelen))
	map = map->next;

	if (!map) {
	KGDB_PRINTK("unknown port spec in %s\n", options);
	return -1;
	}

	kgdb_porttype = map;
	kgdb_serial_setup = map->setup_fn;
	kgdb_portnum = options[map->namelen] - '0';
	options += map->namelen + 1;

	options = (*options == ',') ? options+1 : options;

	/* Read optional parameters (baud/parity/bits) */
	baud = simple_strtoul(options, &options, 10);
	if (baud != 0) {
	kgdb_baud = baud;

	c = toupper(*options);
	if (c == 'E' \|\| c == 'O' \|\| c == 'N') {
	kgdb_parity = c;
	options++;
	}

	c = *options;
	if (c == '7' \|\| c == '8') {
	kgdb_bits = c;
	options++;
	}
	options = (*options == ',') ? options+1 : options;
	}
	}

	/* Check for action specification */
	if (!memcmp(options, "halt", 4)) {
	kgdb_halt = 1;
	options += 4;
	} else if (!memcmp(options, "disabled", 8)) {
	kgdb_enabled = 0;
	options += 8;
	}

	if (*options) {
	KGDB_PRINTK("ignored unknown options: %s\n", options);
	return 0;
	}
	return 1;
	}
	__setup("kgdb=", kgdb_parse_options);
	#endif /* CONFIG_SH_KGDB */