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Sourcecode: linux-2.6 version File versions

setup.c

/*
 *  linux/arch/arm26/kernel/setup.c
 *
 *  Copyright (C) 1995-2001 Russell King
 *  Copyright (C) 2003 Ian Molton
 *
 * 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/kernel.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/utsname.h>
#include <linux/blkdev.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/root_dev.h>

#include <asm/elf.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/procinfo.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/tlbflush.h>

#include <asm/irqchip.h>

#ifndef MEM_SIZE
#define MEM_SIZE  (16*1024*1024)
#endif

#ifdef CONFIG_PREEMPT
DEFINE_SPINLOCK(kernel_flag);
#endif

#if defined(CONFIG_FPE_NWFPE)
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 meminfo *);
extern void convert_to_tag_list(struct tag *tags);
extern void squash_mem_tags(struct tag *tag);
extern void bootmem_init(struct meminfo *);
extern int root_mountflags;
extern int _stext, _text, _etext, _edata, _end;
#ifdef CONFIG_XIP_KERNEL
extern int _endtext, _sdata;
#endif


unsigned int processor_id;
unsigned int __machine_arch_type;
unsigned int system_rev;
unsigned int system_serial_low;
unsigned int system_serial_high;
unsigned int elf_hwcap;
unsigned int memc_ctrl_reg;
unsigned int number_mfm_drives;

struct processor processor;

char elf_platform[ELF_PLATFORM_SIZE];

unsigned long phys_initrd_start __initdata = 0;
unsigned long phys_initrd_size __initdata = 0;
static struct meminfo meminfo __initdata = { 0, };
static struct proc_info_item proc_info;
static const char *machine_name;
static char command_line[COMMAND_LINE_SIZE];

static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;

/*
 * Standard memory resources
 */
static struct resource mem_res[] = {
      { "Video RAM",   0,     0,     IORESOURCE_MEM               },
      { "Kernel code", 0,     0,     IORESOURCE_MEM               },
      { "Kernel data", 0,     0,     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[] = {
      { "reserved",    0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
      { "reserved",    0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
      { "reserved",    0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
};

#define lp0 io_res[0]
#define lp1 io_res[1]
#define lp2 io_res[2]

#define dump_cpu_info() do { } while (0)

static void __init setup_processor(void)
{
      extern struct proc_info_list __proc_info_begin, __proc_info_end;
      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/arm26/mm/proc-*.S
       */
      for (list = &__proc_info_begin; list < &__proc_info_end ; list++)
            if ((processor_id & list->cpu_mask) == list->cpu_val)
                  break;

      /*
       * If processor type is unrecognised, then we
       * can do nothing...
       */
      if (list >= &__proc_info_end) {
            printk("CPU configuration botched (ID %08x), unable "
                   "to continue.\n", processor_id);
            while (1);
      }

      proc_info = *list->info;
      processor = *list->proc;


      printk("CPU: %s %s revision %d\n",
             proc_info.manufacturer, proc_info.cpu_name,
             (int)processor_id & 15);

      dump_cpu_info();

      sprintf(system_utsname.machine, "%s", list->arch_name);
      sprintf(elf_platform, "%s", list->elf_name);
      elf_hwcap = list->elf_hwcap;

      cpu_proc_init();
}

/*
 * Initial parsing of the command line.  We need to pick out the
 * memory size.  We look for mem=size@start, where start and size
 * are "size[KkMm]"
 */
static void __init
parse_cmdline(struct meminfo *mi, char **cmdline_p, char *from)
{
      char c = ' ', *to = command_line;
      int usermem = 0, len = 0;

      for (;;) {
            if (c == ' ' && !memcmp(from, "mem=", 4)) {
                  unsigned long size, start;

                  if (to != command_line)
                        to -= 1;

                  /*
                   * If the user specifies memory size, we
                   * blow away any automatically generated
                   * size.
                   */
                  if (usermem == 0) {
                        usermem = 1;
                        mi->nr_banks = 0;
                  }

                  start = PHYS_OFFSET;
                  size  = memparse(from + 4, &from);
                  if (*from == '@')
                        start = memparse(from + 1, &from);

                  mi->bank[mi->nr_banks].start = start;
                  mi->bank[mi->nr_banks].size  = size;
                  mi->bank[mi->nr_banks].node  = PHYS_TO_NID(start);
                  mi->nr_banks += 1;
            }
            c = *from++;
            if (!c)
                  break;
            if (COMMAND_LINE_SIZE <= ++len)
                  break;
            *to++ = c;
      }
      *to = '\0';
      *cmdline_p = command_line;
}

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 meminfo *mi)
{
      struct resource *res;
      int i;

      kernel_code.start  = init_mm.start_code;
      kernel_code.end    = init_mm.end_code - 1;
#ifdef CONFIG_XIP_KERNEL
      kernel_data.start  = init_mm.start_data;
#else
      kernel_data.start  = init_mm.end_code;
#endif
      kernel_data.end    = init_mm.brk - 1;

      for (i = 0; i < mi->nr_banks; i++) {
            unsigned long virt_start, virt_end;

            if (mi->bank[i].size == 0)
                  continue;

            virt_start = mi->bank[i].start;
            virt_end   = virt_start + mi->bank[i].size - 1;

            res = alloc_bootmem_low(sizeof(*res));
            res->name  = "System RAM";
            res->start = virt_start;
            res->end   = virt_end;
            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);
      }

/*    FIXME - needed? 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 lp1 or lp2
       */
      if (0)  /* FIXME - need to do this for A5k at least */
            request_resource(&ioport_resource, &lp0);
}

/*
 *  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)
{
      if (meminfo.nr_banks >= NR_BANKS) {
            printk(KERN_WARNING
                   "Ignoring memory bank 0x%08x size %dKB\n",
                  tag->u.mem.start, tag->u.mem.size / 1024);
            return -EINVAL;
      }
      meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start;
      meminfo.bank[meminfo.nr_banks].size  = tag->u.mem.size;
      meminfo.bank[meminfo.nr_banks].node  = PHYS_TO_NID(tag->u.mem.start);
      meminfo.nr_banks += 1;

      return 0;
}

__tagtable(ATAG_MEM, parse_tag_mem32);

#if 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_acorn(const struct tag *tag)
{
        memc_ctrl_reg = tag->u.acorn.memc_control_reg;
        number_mfm_drives = tag->u.acorn.adfsdrives;
        return 0;
}

__tagtable(ATAG_ACORN, parse_tag_acorn);

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_initrd(const struct tag *tag)
{
      printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
        phys_initrd_start = (unsigned long)tag->u.initrd.start;
        phys_initrd_size = (unsigned long)tag->u.initrd.size;
      return 0;
}

__tagtable(ATAG_INITRD, parse_tag_initrd);

static int __init parse_tag_initrd2(const struct tag *tag)
{
      printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
      phys_initrd_start = (unsigned long)tag->u.initrd.start;
      phys_initrd_size = (unsigned long)tag->u.initrd.size;
      return 0;
}

__tagtable(ATAG_INITRD2, parse_tag_initrd2);

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)
{
      strncpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
      default_command_line[COMMAND_LINE_SIZE - 1] = '\0';
      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, PHYS_OFFSET },
      { 0, ATAG_NONE }
};

void __init setup_arch(char **cmdline_p)
{
      struct tag *tags = (struct tag *)&init_tags;
      char *from = default_command_line;

      setup_processor();
      if(machine_arch_type == MACH_TYPE_A5K)
            machine_name = "A5000";
      else if(machine_arch_type == MACH_TYPE_ARCHIMEDES)
            machine_name = "Archimedes";
      else
            machine_name = "UNKNOWN";

      //FIXME - the tag struct is always copied here but this is a block
      // of RAM that is accidentally reserved along with video RAM. perhaps
      // it would be a good idea to explicitly reserve this?

      tags = (struct tag *)0x0207c000;

      /*
       * If we have the old style parameters, convert them to
       * a tag list.
       */
      if (tags->hdr.tag != ATAG_CORE)
            convert_to_tag_list(tags);
      if (tags->hdr.tag != ATAG_CORE)
            tags = (struct tag *)&init_tags;
      if (tags->hdr.tag == ATAG_CORE) {
            if (meminfo.nr_banks != 0)
                  squash_mem_tags(tags);
            parse_tags(tags);
      }

      init_mm.start_code = (unsigned long) &_text;
#ifndef CONFIG_XIP_KERNEL
      init_mm.end_code   = (unsigned long) &_etext;
#else
      init_mm.end_code   = (unsigned long) &_endtext;
      init_mm.start_data   = (unsigned long) &_sdata;
#endif
      init_mm.end_data   = (unsigned long) &_edata;
      init_mm.brk    = (unsigned long) &_end;

      memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
      saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
      parse_cmdline(&meminfo, cmdline_p, from);
      bootmem_init(&meminfo);
      paging_init(&meminfo);
      request_standard_resources(&meminfo);

#ifdef CONFIG_VT
#if defined(CONFIG_DUMMY_CONSOLE)
      conswitchp = &dummy_con;
#endif
#endif
}

static const char *hwcap_str[] = {
      "swp",
      "half",
      "thumb",
      "26bit",
      "fastmult",
      "fpa",
      "vfp",
      "edsp",
      NULL
};

static int c_show(struct seq_file *m, void *v)
{
      int i;

      seq_printf(m, "Processor\t: %s %s rev %d (%s)\n",
               proc_info.manufacturer, proc_info.cpu_name,
               (int)processor_id & 15, elf_platform);

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

      /* 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_puts(m, "\n");

      seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
      seq_printf(m, "CPU revision\t: %d\n\n", processor_id & 15);
      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)
{
}

struct seq_operations cpuinfo_op = {
      .start      = c_start,
      .next = c_next,
      .stop = c_stop,
      .show = c_show
};

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