text: /*
   *  linux/arch/arm/kernel/setup.c
   *
   *  Copyright (C) 1995-2001 Russell King
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  #include <linux/export.h>
  #include <linux/kernel.h>
  #include <linux/stddef.h>
  #include <linux/ioport.h>
  #include <linux/delay.h>
  #include <linux/utsname.h>
  #include <linux/initrd.h>
  #include <linux/console.h>
  #include <linux/bootmem.h>
  #include <linux/seq_file.h>
  #include <linux/screen_info.h>
  #include <linux/init.h>
  #include <linux/kexec.h>
  #include <linux/of_fdt.h>
  #include <linux/root_dev.h>
  #include <linux/cpu.h>
  #include <linux/interrupt.h>
  #include <linux/smp.h>
  #include <linux/fs.h>
  #include <linux/proc_fs.h>
  #include <linux/memblock.h>
  #include <linux/bug.h>
  #include <linux/compiler.h>
  #include <linux/sort.h>
  
  #include <asm/unified.h>
  #include <asm/cp15.h>
  #include <asm/cpu.h>
  #include <asm/cputype.h>
  #include <asm/elf.h>
  #include <asm/procinfo.h>
  #include <asm/sections.h>
  #include <asm/setup.h>
  #include <asm/smp_plat.h>
  #include <asm/mach-types.h>
  #include <asm/cacheflush.h>
  #include <asm/cachetype.h>
  #include <asm/tlbflush.h>
  
  #include <asm/prom.h>
  #include <asm/mach/arch.h>
  #include <asm/mach/irq.h>
  #include <asm/mach/time.h>
  #include <asm/system_info.h>
  #include <asm/system_misc.h>
  #include <asm/traps.h>
  #include <asm/unwind.h>
  #include <asm/memblock.h>
  
  #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
  #include "compat.h"
  #endif
  #include "atags.h"
  #include "tcm.h"
  
  #ifndef MEM_SIZE
  #define MEM_SIZE	(16*1024*1024)
  #endif
  
  #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
  char fpe_type[8];
  
  static int __init fpe_setup(char *line)
  {
  	memcpy(fpe_type, line, 8);
  	return 1;
  }
  
  __setup("fpe=", fpe_setup);
  #endif
  
  extern void paging_init(struct machine_desc *desc);
  extern void sanity_check_meminfo(void);
  extern void reboot_setup(char *str);
  extern void setup_dma_zone(struct machine_desc *desc);
  
  unsigned int processor_id;
  EXPORT_SYMBOL(processor_id);
  unsigned int __machine_arch_type __read_mostly;
  EXPORT_SYMBOL(__machine_arch_type);
  unsigned int cacheid __read_mostly;
  EXPORT_SYMBOL(cacheid);
  
  unsigned int __atags_pointer __initdata;
  
  unsigned int system_rev;
  EXPORT_SYMBOL(system_rev);
  
  unsigned int system_serial_low;
  EXPORT_SYMBOL(system_serial_low);
  
  unsigned int system_serial_high;
  EXPORT_SYMBOL(system_serial_high);
  
  unsigned int elf_hwcap __read_mostly;
  EXPORT_SYMBOL(elf_hwcap);
  
  
  #ifdef MULTI_CPU
  struct processor processor __read_mostly;
  #endif
  #ifdef MULTI_TLB
  struct cpu_tlb_fns cpu_tlb __read_mostly;
  #endif
  #ifdef MULTI_USER
  struct cpu_user_fns cpu_user __read_mostly;
  #endif
  #ifdef MULTI_CACHE
  struct cpu_cache_fns cpu_cache __read_mostly;
  #endif
  #ifdef CONFIG_OUTER_CACHE
  struct outer_cache_fns outer_cache __read_mostly;
  EXPORT_SYMBOL(outer_cache);
  #endif
  
  /*
   * Cached cpu_architecture() result for use by assembler code.
   * C code should use the cpu_architecture() function instead of accessing this
   * variable directly.
   */
  int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
  
  struct stack {
  	u32 irq[3];
  	u32 abt[3];
  	u32 und[3];
  } ____cacheline_aligned;
  
  static struct stack stacks[NR_CPUS];
  
  char elf_platform[ELF_PLATFORM_SIZE];
  EXPORT_SYMBOL(elf_platform);
  
  static const char *cpu_name;
  static const char *machine_name;
  static char __initdata cmd_line[COMMAND_LINE_SIZE];
  struct machine_desc *machine_desc __initdata;
  
  static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
  #define ENDIANNESS ((char)endian_test.l)
  
  DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
  
  /*
   * Standard memory resources
   */
  static struct resource mem_res[] = {
  	{
  		.name = "Video RAM",
  		.start = 0,
  		.end = 0,
  		.flags = IORESOURCE_MEM
  	},
  	{
  		.name = "Kernel code",
  		.start = 0,
  		.end = 0,
  		.flags = IORESOURCE_MEM
  	},
  	{
  		.name = "Kernel data",
  		.start = 0,
  		.end = 0,
  		.flags = IORESOURCE_MEM
  	}
  };
  
  #define video_ram   mem_res[0]
  #define kernel_code mem_res[1]
  #define kernel_data mem_res[2]
  
  static struct resource io_res[] = {
  	{
  		.name = "reserved",
  		.start = 0x3bc,
  		.end = 0x3be,
  		.flags = IORESOURCE_IO | IORESOURCE_BUSY
  	},
  	{
  		.name = "reserved",
  		.start = 0x378,
  		.end = 0x37f,
  		.flags = IORESOURCE_IO | IORESOURCE_BUSY
  	},
  	{
  		.name = "reserved",
  		.start = 0x278,
  		.end = 0x27f,
  		.flags = IORESOURCE_IO | IORESOURCE_BUSY
  	}
  };
  
  #define lp0 io_res[0]
  #define lp1 io_res[1]
  #define lp2 io_res[2]
  
  static const char *proc_arch[] = {
  	"undefined/unknown",
  	"3",
  	"4",
  	"4T",
  	"5",
  	"5T",
  	"5TE",
  	"5TEJ",
  	"6TEJ",
  	"7",
  	"?(11)",
  	"?(12)",
  	"?(13)",
  	"?(14)",
  	"?(15)",
  	"?(16)",
  	"?(17)",
  };
  
  static int __get_cpu_architecture(void)
  {
  	int cpu_arch;
  
  	if ((read_cpuid_id() & 0x0008f000) == 0) {
  		cpu_arch = CPU_ARCH_UNKNOWN;
  	} else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
  		cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
  	} else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
  		cpu_arch = (read_cpuid_id() >> 16) & 7;
  		if (cpu_arch)
  			cpu_arch += CPU_ARCH_ARMv3;
  	} else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
  		unsigned int mmfr0;
  
  		/* Revised CPUID format. Read the Memory Model Feature
  		 * Register 0 and check for VMSAv7 or PMSAv7 */
  		asm("mrc	p15, 0, %0, c0, c1, 4"
  		    : "=r" (mmfr0));
  		if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
  		    (mmfr0 & 0x000000f0) >= 0x00000030)
  			cpu_arch = CPU_ARCH_ARMv7;
  		else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
  			 (mmfr0 & 0x000000f0) == 0x00000020)
  			cpu_arch = CPU_ARCH_ARMv6;
  		else
  			cpu_arch = CPU_ARCH_UNKNOWN;
  	} else
  		cpu_arch = CPU_ARCH_UNKNOWN;
  
  	return cpu_arch;
  }
  
  int __pure cpu_architecture(void)
  {
  	BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
  
  	return __cpu_architecture;
  }
  
  static int cpu_has_aliasing_icache(unsigned int arch)
  {
  	int aliasing_icache;
  	unsigned int id_reg, num_sets, line_size;
  
  	/* PIPT caches never alias. */
  	if (icache_is_pipt())
  		return 0;
  
  	/* arch specifies the register format */
  	switch (arch) {
  	case CPU_ARCH_ARMv7:
  		asm("mcr	p15, 2, %0, c0, c0, 0 @ set CSSELR"
  		    : /* No output operands */
  		    : "r" (1));
  		isb();
  		asm("mrc	p15, 1, %0, c0, c0, 0 @ read CCSIDR"
  		    : "=r" (id_reg));
  		line_size = 4 << ((id_reg & 0x7) + 2);
  		num_sets = ((id_reg >> 13) & 0x7fff) + 1;
  		aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
  		break;
  	case CPU_ARCH_ARMv6:
  		aliasing_icache = read_cpuid_cachetype() & (1 << 11);
  		break;
  	default:
  		/* I-cache aliases will be handled by D-cache aliasing code */
  		aliasing_icache = 0;
  	}
  
  	return aliasing_icache;
  }
  
  static void __init cacheid_init(void)
  {
  	unsigned int cachetype = read_cpuid_cachetype();
  	unsigned int arch = cpu_architecture();
  
  	if (arch >= CPU_ARCH_ARMv6) {
  		if ((cachetype & (7 << 29)) == 4 << 29) {
  			/* ARMv7 register format */
  			arch = CPU_ARCH_ARMv7;
  			cacheid = CACHEID_VIPT_NONALIASING;
  			switch (cachetype & (3 << 14)) {
  			case (1 << 14):
  				cacheid |= CACHEID_ASID_TAGGED;
  				break;
  			case (3 << 14):
  				cacheid |= CACHEID_PIPT;
  				break;
  			}
  		} else {
  			arch = CPU_ARCH_ARMv6;
  			if (cachetype & (1 << 23))
  				cacheid = CACHEID_VIPT_ALIASING;
  			else
  				cacheid = CACHEID_VIPT_NONALIASING;
  		}
  		if (cpu_has_aliasing_icache(arch))
  			cacheid |= CACHEID_VIPT_I_ALIASING;
  	} else {
  		cacheid = CACHEID_VIVT;
  	}
  
  	printk("CPU: %s data cache, %s instruction cache\n",
  		cache_is_vivt() ? "VIVT" :
  		cache_is_vipt_aliasing() ? "VIPT aliasing" :
  		cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
  		cache_is_vivt() ? "VIVT" :
  		icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
  		icache_is_vipt_aliasing() ? "VIPT aliasing" :
  		icache_is_pipt() ? "PIPT" :
  		cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
  }
  
  /*
   * These functions re-use the assembly code in head.S, which
   * already provide the required functionality.
   */
  extern struct proc_info_list *lookup_processor_type(unsigned int);
  
  void __init early_print(const char *str, ...)
  {
  	extern void printascii(const char *);
  	char buf[256];
  	va_list ap;
  
  	va_start(ap, str);
  	vsnprintf(buf, sizeof(buf), str, ap);
  	va_end(ap);
  
  #ifdef CONFIG_DEBUG_LL
  	printascii(buf);
  #endif
  	printk("%s", buf);
  }
  
  static void __init feat_v6_fixup(void)
  {
  	int id = read_cpuid_id();
  
  	if ((id & 0xff0f0000) != 0x41070000)
  		return;
  
  	/*
  	 * HWCAP_TLS is available only on 1136 r1p0 and later,
  	 * see also kuser_get_tls_init.
  	 */
  	if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
  		elf_hwcap &= ~HWCAP_TLS;
  }
  
  /*
   * cpu_init - initialise one CPU.
   *
   * cpu_init sets up the per-CPU stacks.
   */
  void cpu_init(void)
  {
  	unsigned int cpu = smp_processor_id();
  	struct stack *stk = &stacks[cpu];
  
  	if (cpu >= NR_CPUS) {
  		printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
  		BUG();
  	}
  
  	cpu_proc_init();
  
  	/*
  	 * Define the placement constraint for the inline asm directive below.
  	 * In Thumb-2, msr with an immediate value is not allowed.
  	 */
  #ifdef CONFIG_THUMB2_KERNEL
  #define PLC	"r"
  #else
  #define PLC	"I"
  #endif
  
  	/*
  	 * setup stacks for re-entrant exception handlers
  	 */
  	__asm__ (
  	"msr	cpsr_c, %1\n\t"
  	"add	r14, %0, %2\n\t"
  	"mov	sp, r14\n\t"
  	"msr	cpsr_c, %3\n\t"
  	"add	r14, %0, %4\n\t"
  	"mov	sp, r14\n\t"
  	"msr	cpsr_c, %5\n\t"
  	"add	r14, %0, %6\n\t"
  	"mov	sp, r14\n\t"
  	"msr	cpsr_c, %7"
  	    :
  	    : "r" (stk),
  	      PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
  	      "I" (offsetof(struct stack, irq[0])),
  	      PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
  	      "I" (offsetof(struct stack, abt[0])),
  	      PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
  	      "I" (offsetof(struct stack, und[0])),
  	      PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
  	    : "r14");
  }
  
  int __cpu_logical_map[NR_CPUS];
  
  void __init smp_setup_processor_id(void)
  {
  	int i;
  	u32 cpu = is_smp() ? read_cpuid_mpidr() & 0xff : 0;
  
  	cpu_logical_map(0) = cpu;
  	for (i = 1; i < NR_CPUS; ++i)
  		cpu_logical_map(i) = i == cpu ? 0 : i;
  
  	printk(KERN_INFO "Booting Linux on physical CPU %d\n", cpu);
  }
  
  static void __init setup_processor(void)
  {
  	struct proc_info_list *list;
  
  	/*
  	 * locate processor in the list of supported processor
  	 * types.  The linker builds this table for us from the
  	 * entries in arch/arm/mm/proc-*.S
  	 */
  	list = lookup_processor_type(read_cpuid_id());
  	if (!list) {
  		printk("CPU configuration botched (ID %08x), unable "
  		       "to continue.\n", read_cpuid_id());
  		while (1);
  	}
  
  	cpu_name = list->cpu_name;
  	__cpu_architecture = __get_cpu_architecture();
  
  #ifdef MULTI_CPU
  	processor = *list->proc;
  #endif
  #ifdef MULTI_TLB
  	cpu_tlb = *list->tlb;
  #endif
  #ifdef MULTI_USER
  	cpu_user = *list->user;
  #endif
  #ifdef MULTI_CACHE
  	cpu_cache = *list->cache;
  #endif
  
  	printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
  	       cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
  	       proc_arch[cpu_architecture()], cr_alignment);
  
  	snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c",
  		 list->arch_name, ENDIANNESS);
  	snprintf(elf_platform, ELF_PLATFORM_SIZE, "%s%c",
  		 list->elf_name, ENDIANNESS);
  	elf_hwcap = list->elf_hwcap;
  #ifndef CONFIG_ARM_THUMB
  	elf_hwcap &= ~HWCAP_THUMB;
  #endif
  
  	feat_v6_fixup();
  
  	cacheid_init();
  	cpu_init();
  }
  
  void __init dump_machine_table(void)
  {
  	struct machine_desc *p;
  
  	early_print("Available machine support:\n\nID (hex)\tNAME\n");
  	for_each_machine_desc(p)
  		early_print("%08x\t%s\n", p->nr, p->name);
  
  	early_print("\nPlease check your kernel config and/or bootloader.\n");
  
  	while (true)
  		/* can't use cpu_relax() here as it may require MMU setup */;
  }
  
  int __init arm_add_memory(phys_addr_t start, phys_addr_t size)
  {
  	struct membank *bank = &meminfo.bank[meminfo.nr_banks];
  
  	if (meminfo.nr_banks >= NR_BANKS) {
  		printk(KERN_CRIT "NR_BANKS too low, "
  			"ignoring memory at 0x%08llx\n", (long long)start);
  		return -EINVAL;
  	}
  
  	/*
  	 * Ensure that start/size are aligned to a page boundary.
  	 * Size is appropriately rounded down, start is rounded up.
  	 */
  	size -= start & ~PAGE_MASK;
  	bank->start = PAGE_ALIGN(start);
  
  #ifndef CONFIG_LPAE
  	if (bank->start + size < bank->start) {
  		printk(KERN_CRIT "Truncating memory at 0x%08llx to fit in "
  			"32-bit physical address space\n", (long long)start);
  		/*
  		 * To ensure bank->start + bank->size is representable in
  		 * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB.
  		 * This means we lose a page after masking.
  		 */
  		size = ULONG_MAX - bank->start;
  	}
  #endif
  
  	bank->size = size & ~(phys_addr_t)(PAGE_SIZE - 1);
  
  	/*
  	 * Check whether this memory region has non-zero size or
  	 * invalid node number.
  	 */
  	if (bank->size == 0)
  		return -EINVAL;
  
  	meminfo.nr_banks++;
  	return 0;
  }
  
  /*
   * Pick out the memory size.  We look for mem=size@start,
   * where start and size are "size[KkMm]"
   */
  static int __init early_mem(char *p)
  {
  	static int usermem __initdata = 0;
  	phys_addr_t size;
  	phys_addr_t start;
  	char *endp;
  
  	/*
  	 * If the user specifies memory size, we
  	 * blow away any automatically generated
  	 * size.
  	 */
  	if (usermem == 0) {
  		usermem = 1;
  		meminfo.nr_banks = 0;
  	}
  
  	start = PHYS_OFFSET;
  	size  = memparse(p, &endp);
  	if (*endp == '@')
  		start = memparse(endp + 1, NULL);
  
  	arm_add_memory(start, size);
  
  	return 0;
  }
  early_param("mem", early_mem);
  
  static void __init
  setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
  {
  #ifdef CONFIG_BLK_DEV_RAM
  	extern int rd_size, rd_image_start, rd_prompt, rd_doload;
  
  	rd_image_start = image_start;
  	rd_prompt = prompt;
  	rd_doload = doload;
  
  	if (rd_sz)
  		rd_size = rd_sz;
  #endif
  }
  
  static void __init request_standard_resources(struct machine_desc *mdesc)
  {
  	struct memblock_region *region;
  	struct resource *res;
  
  	kernel_code.start   = virt_to_phys(_text);
  	kernel_code.end     = virt_to_phys(_etext - 1);
  	kernel_data.start   = virt_to_phys(_sdata);
  	kernel_data.end     = virt_to_phys(_end - 1);
  
  	for_each_memblock(memory, region) {
  		res = alloc_bootmem_low(sizeof(*res));
  		res->name  = "System RAM";
  		res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
  		res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
  		res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
  
  		request_resource(&iomem_resource, res);
  
  		if (kernel_code.start >= res->start &&
  		    kernel_code.end <= res->end)
  			request_resource(res, &kernel_code);
  		if (kernel_data.start >= res->start &&
  		    kernel_data.end <= res->end)
  			request_resource(res, &kernel_data);
  	}
  
  	if (mdesc->video_start) {
  		video_ram.start = mdesc->video_start;
  		video_ram.end   = mdesc->video_end;
  		request_resource(&iomem_resource, &video_ram);
  	}
  
  	/*
  	 * Some machines don't have the possibility of ever
  	 * possessing lp0, lp1 or lp2
  	 */
  	if (mdesc->reserve_lp0)
  		request_resource(&ioport_resource, &lp0);
  	if (mdesc->reserve_lp1)
  		request_resource(&ioport_resource, &lp1);
  	if (mdesc->reserve_lp2)
  		request_resource(&ioport_resource, &lp2);
  }
  
  /*
   *  Tag parsing.
   *
   * This is the new way of passing data to the kernel at boot time.  Rather
   * than passing a fixed inflexible structure to the kernel, we pass a list
   * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
   * tag for the list to be recognised (to distinguish the tagged list from
   * a param_struct).  The list is terminated with a zero-length tag (this tag
   * is not parsed in any way).
   */
  static int __init parse_tag_core(const struct tag *tag)
  {
  	if (tag->hdr.size > 2) {
  		if ((tag->u.core.flags & 1) == 0)
  			root_mountflags &= ~MS_RDONLY;
  		ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
  	}
  	return 0;
  }
  
  __tagtable(ATAG_CORE, parse_tag_core);
  
  static int __init parse_tag_mem32(const struct tag *tag)
  {
  	return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
  }
  
  __tagtable(ATAG_MEM, parse_tag_mem32);
  
  #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  struct screen_info screen_info = {
   .orig_video_lines	= 30,
   .orig_video_cols	= 80,
   .orig_video_mode	= 0,
   .orig_video_ega_bx	= 0,
   .orig_video_isVGA	= 1,
   .orig_video_points	= 8
  };
  
  static int __init parse_tag_videotext(const struct tag *tag)
  {
  	screen_info.orig_x            = tag->u.videotext.x;
  	screen_info.orig_y            = tag->u.videotext.y;
  	screen_info.orig_video_page   = tag->u.videotext.video_page;
  	screen_info.orig_video_mode   = tag->u.videotext.video_mode;
  	screen_info.orig_video_cols   = tag->u.videotext.video_cols;
  	screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
  	screen_info.orig_video_lines  = tag->u.videotext.video_lines;
  	screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
  	screen_info.orig_video_points = tag->u.videotext.video_points;
  	return 0;
  }
  
  __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
  #endif
  
  static int __init parse_tag_ramdisk(const struct tag *tag)
  {
  	setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
  		      (tag->u.ramdisk.flags & 2) == 0,
  		      tag->u.ramdisk.start, tag->u.ramdisk.size);
  	return 0;
  }
  
  __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
  
  static int __init parse_tag_serialnr(const struct tag *tag)
  {
  	system_serial_low = tag->u.serialnr.low;
  	system_serial_high = tag->u.serialnr.high;
  	return 0;
  }
  
  __tagtable(ATAG_SERIAL, parse_tag_serialnr);
  
  static int __init parse_tag_revision(const struct tag *tag)
  {
  	system_rev = tag->u.revision.rev;
  	return 0;
  }
  
  __tagtable(ATAG_REVISION, parse_tag_revision);
  
  static int __init parse_tag_cmdline(const struct tag *tag)
  {
  #if defined(CONFIG_CMDLINE_EXTEND)
  	strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
  	strlcat(default_command_line, tag->u.cmdline.cmdline,
  		COMMAND_LINE_SIZE);
  #elif defined(CONFIG_CMDLINE_FORCE)
  	pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
  #else
  	strlcpy(default_command_line, tag->u.cmdline.cmdline,
  		COMMAND_LINE_SIZE);
  #endif
  	return 0;
  }
  
  __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
  
  /*
   * Scan the tag table for this tag, and call its parse function.
   * The tag table is built by the linker from all the __tagtable
   * declarations.
   */
  static int __init parse_tag(const struct tag *tag)
  {
  	extern struct tagtable __tagtable_begin, __tagtable_end;
  	struct tagtable *t;
  
  	for (t = &__tagtable_begin; t < &__tagtable_end; t++)
  		if (tag->hdr.tag == t->tag) {
  			t->parse(tag);
  			break;
  		}
  
  	return t < &__tagtable_end;
  }
  
  /*
   * Parse all tags in the list, checking both the global and architecture
   * specific tag tables.
   */
  static void __init parse_tags(const struct tag *t)
  {
  	for (; t->hdr.size; t = tag_next(t))
  		if (!parse_tag(t))
  			printk(KERN_WARNING
  				"Ignoring unrecognised tag 0x%08x\n",
  				t->hdr.tag);
  }
  
  /*
   * This holds our defaults.
   */
  static struct init_tags {
  	struct tag_header hdr1;
  	struct tag_core   core;
  	struct tag_header hdr2;
  	struct tag_mem32  mem;
  	struct tag_header hdr3;
  } init_tags __initdata = {
  	{ tag_size(tag_core), ATAG_CORE },
  	{ 1, PAGE_SIZE, 0xff },
  	{ tag_size(tag_mem32), ATAG_MEM },
  	{ MEM_SIZE },
  	{ 0, ATAG_NONE }
  };
  
  static int __init customize_machine(void)
  {
  	/* customizes platform devices, or adds new ones */
  	if (machine_desc->init_machine)
  		machine_desc->init_machine();
  	return 0;
  }
  arch_initcall(customize_machine);
  
  static int __init init_machine_late(void)
  {
  	if (machine_desc->init_late)
  		machine_desc->init_late();
  	return 0;
  }
  late_initcall(init_machine_late);
  
  #ifdef CONFIG_KEXEC
  static inline unsigned long long get_total_mem(void)
  {
  	unsigned long total;
  
  	total = max_low_pfn - min_low_pfn;
  	return total << PAGE_SHIFT;
  }
  
  /**
   * reserve_crashkernel() - reserves memory are for crash kernel
   *
   * This function reserves memory area given in "crashkernel=" kernel command
   * line parameter. The memory reserved is used by a dump capture kernel when
   * primary kernel is crashing.
   */
  static void __init reserve_crashkernel(void)
  {
  	unsigned long long crash_size, crash_base;
  	unsigned long long total_mem;
  	int ret;
  
  	total_mem = get_total_mem();
  	ret = parse_crashkernel(boot_command_line, total_mem,
  				&crash_size, &crash_base);
  	if (ret)
  		return;
  
  	ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
  	if (ret < 0) {
  		printk(KERN_WARNING "crashkernel reservation failed - "
  		       "memory is in use (0x%lx)\n", (unsigned long)crash_base);
  		return;
  	}
  
  	printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
  	       "for crashkernel (System RAM: %ldMB)\n",
  	       (unsigned long)(crash_size >> 20),
  	       (unsigned long)(crash_base >> 20),
  	       (unsigned long)(total_mem >> 20));
  
  	crashk_res.start = crash_base;
  	crashk_res.end = crash_base + crash_size - 1;
  	insert_resource(&iomem_resource, &crashk_res);
  }
  #else
  static inline void reserve_crashkernel(void) {}
  #endif /* CONFIG_KEXEC */
  
  static void __init squash_mem_tags(struct tag *tag)
  {
  	for (; tag->hdr.size; tag = tag_next(tag))
  		if (tag->hdr.tag == ATAG_MEM)
  			tag->hdr.tag = ATAG_NONE;
  }
  
  static struct machine_desc * __init setup_machine_tags(unsigned int nr)
  {
  	struct tag *tags = (struct tag *)&init_tags;
  	struct machine_desc *mdesc = NULL, *p;
  	char *from = default_command_line;
  
  	init_tags.mem.start = PHYS_OFFSET;
  
  	/*
  	 * locate machine in the list of supported machines.
  	 */
  	for_each_machine_desc(p)
  		if (nr == p->nr) {
  			printk("Machine: %s\n", p->name);
  			mdesc = p;
  			break;
  		}
  
  	if (!mdesc) {
  		early_print("\nError: unrecognized/unsupported machine ID"
  			" (r1 = 0x%08x).\n\n", nr);
  		dump_machine_table(); /* does not return */
  	}
  
  	if (__atags_pointer)
  		tags = phys_to_virt(__atags_pointer);
  	else if (mdesc->atag_offset)
  		tags = (void *)(PAGE_OFFSET + mdesc->atag_offset);
  
  #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
  	/*
  	 * If we have the old style parameters, convert them to
  	 * a tag list.
  	 */
  	if (tags->hdr.tag != ATAG_CORE)
  		convert_to_tag_list(tags);
  #endif
  
  	if (tags->hdr.tag != ATAG_CORE) {
  #if defined(CONFIG_OF)
  		/*
  		 * If CONFIG_OF is set, then assume this is a reasonably
  		 * modern system that should pass boot parameters
  		 */
  		early_print("Warning: Neither atags nor dtb found\n");
  #endif
  		tags = (struct tag *)&init_tags;
  	}
  
  	if (mdesc->fixup)
  		mdesc->fixup(tags, &from, &meminfo);
  
  	if (tags->hdr.tag == ATAG_CORE) {
  		if (meminfo.nr_banks != 0)
  			squash_mem_tags(tags);
  		save_atags(tags);
  		parse_tags(tags);
  	}
  
  	/* parse_early_param needs a boot_command_line */
  	strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
  
  	return mdesc;
  }
  
  static int __init meminfo_cmp(const void *_a, const void *_b)
  {
  	const struct membank *a = _a, *b = _b;
  	long cmp = bank_pfn_start(a) - bank_pfn_start(b);
  	return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
  }
  
  void __init setup_arch(char **cmdline_p)
  {
  	struct machine_desc *mdesc;
  
  	setup_processor();
  	mdesc = setup_machine_fdt(__atags_pointer);
  	if (!mdesc)
  		mdesc = setup_machine_tags(machine_arch_type);
  	machine_desc = mdesc;
  	machine_name = mdesc->name;
  
  	setup_dma_zone(mdesc);
  
  	if (mdesc->restart_mode)
  		reboot_setup(&mdesc->restart_mode);
  
  	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;
  
  	/* populate cmd_line too for later use, preserving boot_command_line */
  	strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
  	*cmdline_p = cmd_line;
  
  	parse_early_param();
  
  	sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
  	sanity_check_meminfo();
  	arm_memblock_init(&meminfo, mdesc);
  
  	paging_init(mdesc);
  	request_standard_resources(mdesc);
  
  	if (mdesc->restart)
  		arm_pm_restart = mdesc->restart;
  
  	unflatten_device_tree();
  
  #ifdef CONFIG_SMP
  	if (is_smp())
  		smp_init_cpus();
  #endif
  	reserve_crashkernel();
  
  	tcm_init();
  
  #ifdef CONFIG_MULTI_IRQ_HANDLER
  	handle_arch_irq = mdesc->handle_irq;
  #endif
  
  #ifdef CONFIG_VT
  #if defined(CONFIG_VGA_CONSOLE)
  	conswitchp = &vga_con;
  #elif defined(CONFIG_DUMMY_CONSOLE)
  	conswitchp = &dummy_con;
  #endif
  #endif
  
  	if (mdesc->init_early)
  		mdesc->init_early();
  }
  
  
  static int __init topology_init(void)
  {
  	int cpu;
  
  	for_each_possible_cpu(cpu) {
  		struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
  		cpuinfo->cpu.hotpluggable = 1;
  		register_cpu(&cpuinfo->cpu, cpu);
  	}
  
  	return 0;
  }
  subsys_initcall(topology_init);
  
  #ifdef CONFIG_HAVE_PROC_CPU
  static int __init proc_cpu_init(void)
  {
  	struct proc_dir_entry *res;
  
  	res = proc_mkdir("cpu", NULL);
  	if (!res)
  		return -ENOMEM;
  	return 0;
  }
  fs_initcall(proc_cpu_init);
  #endif
  
  static const char *hwcap_str[] = {
  	"swp",
  	"half",
  	"thumb",
  	"26bit",
  	"fastmult",
  	"fpa",
  	"vfp",
  	"edsp",
  	"java",
  	"iwmmxt",
  	"crunch",
  	"thumbee",
  	"neon",
  	"vfpv3",
  	"vfpv3d16",
  	"tls",
  	"vfpv4",
  	"idiva",
  	"idivt",
  	NULL
  };
  
  static int c_show(struct seq_file *m, void *v)
  {
  	int i;
  
  	seq_printf(m, "Processor\t: %s rev %d (%s)\n",
  		   cpu_name, read_cpuid_id() & 15, elf_platform);
  
  #if defined(CONFIG_SMP)
  	for_each_online_cpu(i) {
  		/*
  		 * glibc reads /proc/cpuinfo to determine the number of
  		 * online processors, looking for lines beginning with
  		 * "processor".  Give glibc what it expects.
  		 */
  		seq_printf(m, "processor\t: %d\n", i);
  		seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
  			   per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
  			   (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
  	}
  #else /* CONFIG_SMP */
  	seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
  		   loops_per_jiffy / (500000/HZ),
  		   (loops_per_jiffy / (5000/HZ)) % 100);
  #endif
  
  	/* dump out the processor features */
  	seq_puts(m, "Features\t: ");
  
  	for (i = 0; hwcap_str[i]; i++)
  		if (elf_hwcap & (1 << i))
  			seq_printf(m, "%s ", hwcap_str[i]);
  
  	seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
  	seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
  
  	if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
  		/* pre-ARM7 */
  		seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
  	} else {
  		if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
  			/* ARM7 */
  			seq_printf(m, "CPU variant\t: 0x%02x\n",
  				   (read_cpuid_id() >> 16) & 127);
  		} else {
  			/* post-ARM7 */
  			seq_printf(m, "CPU variant\t: 0x%x\n",
  				   (read_cpuid_id() >> 20) & 15);
  		}
  		seq_printf(m, "CPU part\t: 0x%03x\n",
  			   (read_cpuid_id() >> 4) & 0xfff);
  	}
  	seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
  
  	seq_puts(m, "\n");
  
  	seq_printf(m, "Hardware\t: %s\n", machine_name);
  	seq_printf(m, "Revision\t: %04x\n", system_rev);
  	seq_printf(m, "Serial\t\t: %08x%08x\n",
  		   system_serial_high, system_serial_low);
  
  	return 0;
  }
  
  static void *c_start(struct seq_file *m, loff_t *pos)
  {
  	return *pos < 1 ? (void *)1 : NULL;
  }
  
  static void *c_next(struct seq_file *m, void *v, loff_t *pos)
  {
  	++*pos;
  	return NULL;
  }
  
  static void c_stop(struct seq_file *m, void *v)
  {
  }
  
  const struct seq_operations cpuinfo_op = {
  	.start	= c_start,
  	.next	= c_next,
  	.stop	= c_stop,
  	.show	= c_show
  };
  