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setup.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * arch/sh64/kernel/setup.c
 *
 * sh64 Arch Support
 *
 * This file handles the architecture-dependent parts of initialization
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 * Copyright (C) 2003, 2004  Paul Mundt
 *
 * benedict.gaster@superh.com:   2nd May 2002
 *    Modified to use the empty_zero_page to pass command line arguments.
 *
 * benedict.gaster@superh.com:       3rd May 2002
 *    Added support for ramdisk, removing statically linked romfs at the same time.
 *
 * lethal@linux-sh.org:          15th May 2003
 *    Added generic procfs cpuinfo reporting. Make boards just export their name.
 *
 * lethal@linux-sh.org:          25th May 2003
 *    Added generic get_cpu_subtype() for subtype reporting from cpu_data->type.
 *
 */
#include <linux/errno.h>
#include <linux/rwsem.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/screen_info.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/blkdev.h>
#include <linux/bootmem.h>
#include <linux/console.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/initrd.h>
#include <linux/pfn.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/platform.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/smp.h>

struct screen_info screen_info;

#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

extern int root_mountflags;
extern char *get_system_type(void);
extern void platform_setup(void);
extern void platform_monitor(void);
extern void platform_reserve(void);
extern int sh64_cache_init(void);
extern int sh64_tlb_init(void);

#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, };
unsigned long long memory_start = CONFIG_MEMORY_START;
unsigned long long memory_end = CONFIG_MEMORY_START + (CONFIG_MEMORY_SIZE_IN_MB * 1024 * 1024);

struct sh_cpuinfo boot_cpu_data;

static inline void parse_mem_cmdline (char ** cmdline_p)
{
        char c = ' ', *to = command_line, *from = COMMAND_LINE;
      int len = 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';

      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;
                  }
            }
            c = *(from++);
            if (!c)
              break;
            if (COMMAND_LINE_SIZE <= ++len)
              break;
            *(to++) = c;
      }
      *to = '\0';

      *cmdline_p = command_line;
}

static void __init sh64_cpu_type_detect(void)
{
      extern unsigned long long peek_real_address_q(unsigned long long addr);
      unsigned long long cir;
      /* Do peeks in real mode to avoid having to set up a mapping for the
         WPC registers.  On SH5-101 cut2, such a mapping would be exposed to
         an address translation erratum which would make it hard to set up
         correctly. */
      cir = peek_real_address_q(0x0d000008);

      if ((cir & 0xffff) == 0x5103) {
            boot_cpu_data.type = CPU_SH5_103;
      } else if (((cir >> 32) & 0xffff) == 0x51e2) {
            /* CPU.VCR aliased at CIR address on SH5-101 */
            boot_cpu_data.type = CPU_SH5_101;
      } else {
            boot_cpu_data.type = CPU_SH_NONE;
      }
}

void __init setup_arch(char **cmdline_p)
{
      unsigned long bootmap_size, i;
      unsigned long first_pfn, start_pfn, last_pfn, pages;

#ifdef CONFIG_EARLY_PRINTK
      extern void enable_early_printk(void);

      /*
       * Setup Early SCIF console
       */
      enable_early_printk();
#endif

      /*
       * Setup TLB mappings
       */
      sh64_tlb_init();

      /*
       * Caches are already initialized by the time we get here, so we just
       * fill in cpu_data info for the caches.
       */
      sh64_cache_init();

      platform_setup();
      platform_monitor();

      sh64_cpu_type_detect();

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

      parse_mem_cmdline(cmdline_p);

      /*
       * Find the lowest and highest page frame numbers we have available
       */
      first_pfn = PFN_DOWN(memory_start);
      last_pfn = PFN_DOWN(memory_end);
      pages = last_pfn - first_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,
                               first_pfn,
                               last_pfn);
        /*
         * Round it up.
         */
        bootmap_size = PFN_PHYS(PFN_UP(bootmap_size));

      /*
       * Register fully available RAM pages with the bootmem allocator.
       */
      free_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn), PFN_PHYS(pages));

      /*
       * Reserve all kernel sections + bootmem bitmap + a guard page.
       */
      reserve_bootmem_node(NODE_DATA(0), PFN_PHYS(first_pfn),
                    (PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE) - PFN_PHYS(first_pfn));

      /*
       * Reserve platform dependent sections
       */
      platform_reserve();

#ifdef CONFIG_BLK_DEV_INITRD
      if (LOADER_TYPE && INITRD_START) {
            if (INITRD_START + INITRD_SIZE <= (PFN_PHYS(last_pfn))) {
                    reserve_bootmem_node(NODE_DATA(0), INITRD_START + __MEMORY_START, INITRD_SIZE);

                  initrd_start = (long) 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",
                            (long) INITRD_START + INITRD_SIZE,
                            PFN_PHYS(last_pfn));
                  initrd_start = 0;
            }
      }
#endif

      /*
       * Claim all RAM, ROM, and I/O resources.
       */

      /* Kernel RAM */
      request_resource(&iomem_resource, &code_resource);
      request_resource(&iomem_resource, &data_resource);

      /* Other KRAM space */
      for (i = 0; i < STANDARD_KRAM_RESOURCES - 2; i++)
            request_resource(&iomem_resource,
                         &platform_parms.kram_res_p[i]);

      /* XRAM space */
      for (i = 0; i < STANDARD_XRAM_RESOURCES; i++)
            request_resource(&iomem_resource,
                         &platform_parms.xram_res_p[i]);

      /* ROM space */
      for (i = 0; i < STANDARD_ROM_RESOURCES; i++)
            request_resource(&iomem_resource,
                         &platform_parms.rom_res_p[i]);

      /* I/O space */
      for (i = 0; i < STANDARD_IO_RESOURCES; i++)
            request_resource(&ioport_resource,
                         &platform_parms.io_res_p[i]);


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

      printk("Hardware FPU: %s\n", fpu_in_use ? "enabled" : "disabled");

      paging_init();
}

void __xchg_called_with_bad_pointer(void)
{
      printk(KERN_EMERG "xchg() called with bad pointer !\n");
}

static struct cpu cpu[1];

static int __init topology_init(void)
{
      return register_cpu(cpu, 0);
}

subsys_initcall(topology_init);

/*
 *    Get CPU information
 */
static const char *cpu_name[] = {
      [CPU_SH5_101]     = "SH5-101",
      [CPU_SH5_103]     = "SH5-103",
      [CPU_SH_NONE]     = "Unknown",
};

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

#ifdef CONFIG_PROC_FS
static int show_cpuinfo(struct seq_file *m,void *v)
{
      unsigned int cpu = smp_processor_id();

      if (!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: SH-5\n");
      seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype());

      seq_printf(m, "icache size\t: %dK-bytes\n",
               (boot_cpu_data.icache.ways *
                boot_cpu_data.icache.sets *
                boot_cpu_data.icache.linesz) >> 10);
      seq_printf(m, "dcache size\t: %dK-bytes\n",
               (boot_cpu_data.dcache.ways *
                boot_cpu_data.dcache.sets *
                boot_cpu_data.dcache.linesz) >> 10);
      seq_printf(m, "itlb entries\t: %d\n", boot_cpu_data.itlb.entries);
      seq_printf(m, "dtlb entries\t: %d\n", boot_cpu_data.dtlb.entries);

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

      PRINT_CLOCK("cpu", boot_cpu_data.cpu_clock);
      PRINT_CLOCK("bus", boot_cpu_data.bus_clock);
      PRINT_CLOCK("module", boot_cpu_data.module_clock);

        seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
                 (loops_per_jiffy*HZ+2500)/500000,
                 ((loops_per_jiffy*HZ+2500)/5000) % 100);

      return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
      return (void*)(*pos == 0);
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
      return NULL;
}
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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