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setup.c

/*
 * arch/sh/kernel/setup.c
 *
 * This file handles the architecture-dependent parts of initialization
 *
 *  Copyright (C) 1999  Niibe Yutaka
 *  Copyright (C) 2002 - 2007 Paul Mundt
 */
#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/nodemask.h>
#include <linux/cpu.h>
#include <linux/pfn.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/kexec.h>
#include <linux/module.h>
#include <linux/smp.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/sections.h>
#include <asm/irq.h>
#include <asm/setup.h>
#include <asm/clock.h>
#include <asm/mmu_context.h>

/*
 * 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 cpu_data[NR_CPUS] __read_mostly = {
      [0] = {
            .type             = CPU_SH_NONE,
            .loops_per_jiffy  = 10000000,
      },
};
EXPORT_SYMBOL(cpu_data);

/*
 * The machine vector. First entry in .machvec.init, or clobbered by
 * sh_mv= on the command line, prior to .machvec.init teardown.
 */
struct sh_machine_vector sh_mv = { .mv_name = "generic", };

#ifdef CONFIG_VT
struct screen_info screen_info;
#endif

extern int root_mountflags;

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

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

static struct resource code_resource = {
      .name = "Kernel code",
      .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};

static struct resource data_resource = {
      .name = "Kernel data",
      .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};

unsigned long memory_start;
EXPORT_SYMBOL(memory_start);
unsigned long memory_end = 0;
EXPORT_SYMBOL(memory_end);

static int __init early_parse_mem(char *p)
{
      unsigned long size;

      memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
      size = memparse(p, &p);
      memory_end = memory_start + size;

      return 0;
}
early_param("mem", early_parse_mem);

/*
 * Register fully available low RAM pages with the bootmem allocator.
 */
static void __init register_bootmem_low_pages(void)
{
      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(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
}

#ifdef CONFIG_KEXEC
static void __init reserve_crashkernel(void)
{
      unsigned long long free_mem;
      unsigned long long crash_size, crash_base;
      int ret;

      free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;

      ret = parse_crashkernel(boot_command_line, free_mem,
                  &crash_size, &crash_base);
      if (ret == 0 && crash_size) {
            if (crash_base > 0) {
                  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)(free_mem >> 20));
                  crashk_res.start = crash_base;
                  crashk_res.end   = crash_base + crash_size - 1;
                  reserve_bootmem(crash_base, crash_size);
            } else
                  printk(KERN_INFO "crashkernel reservation failed - "
                              "you have to specify a base address\n");
      }
}
#else
static inline void __init reserve_crashkernel(void)
{}
#endif

void __init setup_bootmem_allocator(unsigned long free_pfn)
{
      unsigned long bootmap_size;

      /*
       * 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), free_pfn,
                               min_low_pfn, max_low_pfn);

      add_active_range(0, min_low_pfn, max_low_pfn);
      register_bootmem_low_pages();

      node_set_online(0);

      /*
       * 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(__MEMORY_START+PAGE_SIZE,
            (PFN_PHYS(free_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(__MEMORY_START, PAGE_SIZE);

      sparse_memory_present_with_active_regions(0);

#ifdef CONFIG_BLK_DEV_INITRD
      ROOT_DEV = Root_RAM0;

      if (LOADER_TYPE && INITRD_START) {
            if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
                  reserve_bootmem(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

      reserve_crashkernel();
}

#ifndef CONFIG_NEED_MULTIPLE_NODES
static void __init setup_memory(void)
{
      unsigned long start_pfn;

      /*
       * Partially used pages are not usable - thus
       * we are rounding upwards:
       */
      start_pfn = PFN_UP(__pa(_end));
      setup_bootmem_allocator(start_pfn);
}
#else
extern void __init setup_memory(void);
#endif

void __init setup_arch(char **cmdline_p)
{
      enable_mmu();

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

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

#ifdef CONFIG_CMDLINE_BOOL
      strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
#else
      strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
#endif

      /* Save unparsed command line copy for /proc/cmdline */
      memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
      *cmdline_p = command_line;

      parse_early_param();

      sh_mv_setup();

      /*
       * 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;
      min_low_pfn = __MEMORY_START >> PAGE_SHIFT;

      nodes_clear(node_online_map);

      /* Setup bootmem with available RAM */
      setup_memory();
      sparse_init();

#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();

#ifdef CONFIG_SMP
      plat_smp_setup();
#endif
}

static const char *cpu_name[] = {
      [CPU_SH7206]      = "SH7206", [CPU_SH7619]      = "SH7619",
      [CPU_SH7705]      = "SH7705", [CPU_SH7706]      = "SH7706",
      [CPU_SH7707]      = "SH7707", [CPU_SH7708]      = "SH7708",
      [CPU_SH7709]      = "SH7709", [CPU_SH7710]      = "SH7710",
      [CPU_SH7712]      = "SH7712", [CPU_SH7720]      = "SH7720",
      [CPU_SH7729]      = "SH7729", [CPU_SH7750]      = "SH7750",
      [CPU_SH7750S]     = "SH7750S",      [CPU_SH7750R]     = "SH7750R",
      [CPU_SH7751]      = "SH7751", [CPU_SH7751R]     = "SH7751R",
      [CPU_SH7760]      = "SH7760",
      [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_SH7722]      = "SH7722",
      [CPU_SHX3]  = "SH-X3",  [CPU_SH_NONE]     = "Unknown"
};

const char *get_cpu_subtype(struct sh_cpuinfo *c)
{
      return cpu_name[c->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", "op32", NULL
};

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

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

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

      for (i = 0; cpu_flags[i]; i++)
            if ((c->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)
{
      struct sh_cpuinfo *c = v;
      unsigned int cpu = c - cpu_data;

      if (!cpu_online(cpu))
            return 0;

      if (cpu == 0)
            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(c));

      show_cpuflags(m, c);

      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 (c->icache.flags & SH_CACHE_COMBINED) {
            seq_printf(m, "unified\n");
            show_cacheinfo(m, "cache", c->icache);
      } else {
            seq_printf(m, "split (harvard)\n");
            show_cacheinfo(m, "icache", c->icache);
            show_cacheinfo(m, "dcache", c->dcache);
      }

      /* Optional secondary cache */
      if (c->flags & CPU_HAS_L2_CACHE)
            show_cacheinfo(m, "scache", c->scache);

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

      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,
};
#endif /* CONFIG_PROC_FS */

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