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setup.c

/*
 *  linux/arch/m32r/kernel/setup.c
 *
 *  Setup routines for Renesas M32R
 *
 *  Copyright (c) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata,
 *                            Hitoshi Yamamoto
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/console.h>
#include <linux/initrd.h>
#include <linux/major.h>
#include <linux/root_dev.h>
#include <linux/seq_file.h>
#include <linux/timex.h>
#include <linux/screen_info.h>
#include <linux/cpu.h>
#include <linux/nodemask.h>
#include <linux/pfn.h>

#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/m32r.h>
#include <asm/setup.h>
#include <asm/sections.h>

#ifdef CONFIG_MMU
extern void init_mmu(void);
#endif

extern char _end[];

/*
 * Machine setup..
 */
struct cpuinfo_m32r boot_cpu_data;

#ifdef CONFIG_BLK_DEV_RAM
extern int rd_doload;   /* 1 = load ramdisk, 0 = don't load */
extern int rd_prompt;   /* 1 = prompt for ramdisk, 0 = don't prompt */
extern int rd_image_start;    /* starting block # of image */
#endif

#if defined(CONFIG_VGA_CONSOLE)
struct screen_info screen_info = {
      .orig_video_lines      = 25,
      .orig_video_cols       = 80,
      .orig_video_mode       = 0,
      .orig_video_ega_bx     = 0,
      .orig_video_isVGA      = 1,
      .orig_video_points     = 8
};
#endif

extern int root_mountflags;

static char __initdata command_line[COMMAND_LINE_SIZE];

static struct resource data_resource = {
      .name   = "Kernel data",
      .start  = 0,
      .end    = 0,
      .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
};

static struct resource code_resource = {
      .name   = "Kernel code",
      .start  = 0,
      .end    = 0,
      .flags  = IORESOURCE_BUSY | IORESOURCE_MEM
};

unsigned long memory_start;
unsigned long memory_end;

void __init setup_arch(char **);
int get_cpuinfo(char *);

static __inline__ void parse_mem_cmdline(char ** cmdline_p)
{
      char c = ' ';
      char *to = command_line;
      char *from = COMMAND_LINE;
      int len = 0;
      int usermem = 0;

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

      memory_start = (unsigned long)CONFIG_MEMORY_START+PAGE_OFFSET;
      memory_end = memory_start+(unsigned long)CONFIG_MEMORY_SIZE;

      for ( ; ; ) {
            if (c == ' ' && !memcmp(from, "mem=", 4)) {
                  if (to != command_line)
                        to--;

                  {
                        unsigned long mem_size;

                        usermem = 1;
                        mem_size = memparse(from+4, &from);
                        memory_end = memory_start + mem_size;
                  }
            }
            c = *(from++);
            if (!c)
                  break;

            if (COMMAND_LINE_SIZE <= ++len)
                  break;

            *(to++) = c;
      }
      *to = '\0';
      *cmdline_p = command_line;
      if (usermem)
            printk(KERN_INFO "user-defined physical RAM map:\n");
}

#ifndef CONFIG_DISCONTIGMEM
static unsigned long __init setup_memory(void)
{
      unsigned long start_pfn, max_low_pfn, bootmap_size;

      start_pfn = PFN_UP( __pa(_end) );
      max_low_pfn = PFN_DOWN( __pa(memory_end) );

      /*
       * Initialize the boot-time allocator (with low memory only):
       */
      bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
            CONFIG_MEMORY_START>>PAGE_SHIFT, max_low_pfn);

      /*
       * Register fully available low RAM pages with the bootmem allocator.
       */
      {
            unsigned long curr_pfn;
            unsigned long last_pfn;
            unsigned long pages;

            /*
             * We are rounding up the start address of usable memory:
             */
            curr_pfn = PFN_UP(__pa(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));
      }

      /*
       * 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(CONFIG_MEMORY_START + PAGE_SIZE,
            (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE - 1)
            - CONFIG_MEMORY_START);

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

      /*
       * reserve memory hole
       */
#ifdef CONFIG_MEMHOLE
      reserve_bootmem(CONFIG_MEMHOLE_START, CONFIG_MEMHOLE_SIZE);
#endif

#ifdef CONFIG_BLK_DEV_INITRD
      if (LOADER_TYPE && INITRD_START) {
            if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
                  reserve_bootmem(INITRD_START, INITRD_SIZE);
                  initrd_start = INITRD_START + PAGE_OFFSET;
                  initrd_end = initrd_start + INITRD_SIZE;
                  printk("initrd:start[%08lx],size[%08lx]\n",
                        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

      return max_low_pfn;
}
#else /* CONFIG_DISCONTIGMEM */
extern unsigned long setup_memory(void);
#endif      /* CONFIG_DISCONTIGMEM */

void __init setup_arch(char **cmdline_p)
{
      ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);

      boot_cpu_data.cpu_clock = M32R_CPUCLK;
      boot_cpu_data.bus_clock = M32R_BUSCLK;
      boot_cpu_data.timer_divide = M32R_TIMER_DIVIDE;

#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;

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

#ifdef CONFIG_DISCONTIGMEM
      nodes_clear(node_online_map);
      node_set_online(0);
      node_set_online(1);
#endif      /* CONFIG_DISCONTIGMEM */

      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;

      parse_mem_cmdline(cmdline_p);

      setup_memory();

      paging_init();
}

static struct cpu cpu_devices[NR_CPUS];

static int __init topology_init(void)
{
      int i;

      for_each_present_cpu(i)
            register_cpu(&cpu_devices[i], i);

      return 0;
}

subsys_initcall(topology_init);

#ifdef CONFIG_PROC_FS
/*
 *    Get CPU information for use by the procfs.
 */
static int show_cpuinfo(struct seq_file *m, void *v)
{
      struct cpuinfo_m32r *c = v;
      unsigned long cpu = c - cpu_data;

#ifdef CONFIG_SMP
      if (!cpu_online(cpu))
            return 0;
#endif      /* CONFIG_SMP */

      seq_printf(m, "processor\t: %ld\n", cpu);

#if defined(CONFIG_CHIP_VDEC2)
      seq_printf(m, "cpu family\t: VDEC2\n"
            "cache size\t: Unknown\n");
#elif defined(CONFIG_CHIP_M32700)
      seq_printf(m,"cpu family\t: M32700\n"
            "cache size\t: I-8KB/D-8KB\n");
#elif defined(CONFIG_CHIP_M32102)
      seq_printf(m,"cpu family\t: M32102\n"
            "cache size\t: I-8KB\n");
#elif defined(CONFIG_CHIP_OPSP)
      seq_printf(m,"cpu family\t: OPSP\n"
            "cache size\t: I-8KB/D-8KB\n");
#elif defined(CONFIG_CHIP_MP)
      seq_printf(m, "cpu family\t: M32R-MP\n"
            "cache size\t: I-xxKB/D-xxKB\n");
#elif  defined(CONFIG_CHIP_M32104)
      seq_printf(m,"cpu family\t: M32104\n"
            "cache size\t: I-8KB/D-8KB\n");
#else
      seq_printf(m, "cpu family\t: Unknown\n");
#endif
      seq_printf(m, "bogomips\t: %lu.%02lu\n",
            c->loops_per_jiffy/(500000/HZ),
            (c->loops_per_jiffy/(5000/HZ)) % 100);
#if defined(CONFIG_PLAT_MAPPI)
      seq_printf(m, "Machine\t\t: Mappi Evaluation board\n");
#elif defined(CONFIG_PLAT_MAPPI2)
      seq_printf(m, "Machine\t\t: Mappi-II Evaluation board\n");
#elif defined(CONFIG_PLAT_MAPPI3)
      seq_printf(m, "Machine\t\t: Mappi-III Evaluation board\n");
#elif defined(CONFIG_PLAT_M32700UT)
      seq_printf(m, "Machine\t\t: M32700UT Evaluation board\n");
#elif defined(CONFIG_PLAT_OPSPUT)
      seq_printf(m, "Machine\t\t: OPSPUT Evaluation board\n");
#elif defined(CONFIG_PLAT_USRV)
      seq_printf(m, "Machine\t\t: uServer\n");
#elif defined(CONFIG_PLAT_OAKS32R)
      seq_printf(m, "Machine\t\t: OAKS32R\n");
#elif  defined(CONFIG_PLAT_M32104UT)
      seq_printf(m, "Machine\t\t: M3T-M32104UT uT Engine board\n");
#else
      seq_printf(m, "Machine\t\t: Unknown\n");
#endif

#define PRINT_CLOCK(name, value)                      \
      seq_printf(m, name " clock\t: %d.%02dMHz\n",          \
            ((value) / 1000000), ((value) % 1000000)/10000)

      PRINT_CLOCK("CPU", (int)c->cpu_clock);
      PRINT_CLOCK("Bus", (int)c->bus_clock);

      seq_printf(m, "\n");

      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 */

unsigned long cpu_initialized __initdata = 0;

/*
 * cpu_init() initializes state that is per-CPU. Some data is already
 * initialized (naturally) in the bootstrap process.
 * We reload them nevertheless, this function acts as a
 * 'CPU state barrier', nothing should get across.
 */
#if defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_XNUX2)      \
      || defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_M32102) \
      || defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
void __init cpu_init (void)
{
      int cpu_id = smp_processor_id();

      if (test_and_set_bit(cpu_id, &cpu_initialized)) {
            printk(KERN_WARNING "CPU#%d already initialized!\n", cpu_id);
            for ( ; ; )
                  local_irq_enable();
      }
      printk(KERN_INFO "Initializing CPU#%d\n", cpu_id);

      /* Set up and load the per-CPU TSS and LDT */
      atomic_inc(&init_mm.mm_count);
      current->active_mm = &init_mm;
      if (current->mm)
            BUG();

      /* Force FPU initialization */
      current_thread_info()->status = 0;
      clear_used_math();

#ifdef CONFIG_MMU
      /* Set up MMU */
      init_mmu();
#endif

      /* Set up ICUIMASK */
      outl(0x00070000, M32R_ICU_IMASK_PORTL);         /* imask=111 */
}
#endif      /* defined(CONFIG_CHIP_VDEC2) ... */

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