linux/arch/sparc/kernel/setup.c
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   1/*
   2 *  linux/arch/sparc/kernel/setup.c
   3 *
   4 *  Copyright (C) 1995  David S. Miller (davem@caip.rutgers.edu)
   5 *  Copyright (C) 2000  Anton Blanchard (anton@samba.org)
   6 */
   7
   8#include <linux/errno.h>
   9#include <linux/sched.h>
  10#include <linux/kernel.h>
  11#include <linux/mm.h>
  12#include <linux/stddef.h>
  13#include <linux/unistd.h>
  14#include <linux/ptrace.h>
  15#include <linux/slab.h>
  16#include <linux/initrd.h>
  17#include <asm/smp.h>
  18#include <linux/user.h>
  19#include <linux/screen_info.h>
  20#include <linux/delay.h>
  21#include <linux/fs.h>
  22#include <linux/seq_file.h>
  23#include <linux/syscalls.h>
  24#include <linux/kdev_t.h>
  25#include <linux/major.h>
  26#include <linux/string.h>
  27#include <linux/init.h>
  28#include <linux/interrupt.h>
  29#include <linux/console.h>
  30#include <linux/spinlock.h>
  31#include <linux/root_dev.h>
  32#include <linux/cpu.h>
  33#include <linux/kdebug.h>
  34
  35#include <asm/system.h>
  36#include <asm/io.h>
  37#include <asm/processor.h>
  38#include <asm/oplib.h>
  39#include <asm/page.h>
  40#include <asm/pgtable.h>
  41#include <asm/traps.h>
  42#include <asm/vaddrs.h>
  43#include <asm/mbus.h>
  44#include <asm/idprom.h>
  45#include <asm/machines.h>
  46#include <asm/cpudata.h>
  47#include <asm/setup.h>
  48
  49struct screen_info screen_info = {
  50        0, 0,                   /* orig-x, orig-y */
  51        0,                      /* unused */
  52        0,                      /* orig-video-page */
  53        0,                      /* orig-video-mode */
  54        128,                    /* orig-video-cols */
  55        0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  56        54,                     /* orig-video-lines */
  57        0,                      /* orig-video-isVGA */
  58        16                      /* orig-video-points */
  59};
  60
  61/* Typing sync at the prom prompt calls the function pointed to by
  62 * romvec->pv_synchook which I set to the following function.
  63 * This should sync all filesystems and return, for now it just
  64 * prints out pretty messages and returns.
  65 */
  66
  67extern unsigned long trapbase;
  68
  69/* Pretty sick eh? */
  70static void prom_sync_me(void)
  71{
  72        unsigned long prom_tbr, flags;
  73
  74        /* XXX Badly broken. FIX! - Anton */
  75        local_irq_save(flags);
  76        __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
  77        __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  78                             "nop\n\t"
  79                             "nop\n\t"
  80                             "nop\n\t" : : "r" (&trapbase));
  81
  82        prom_printf("PROM SYNC COMMAND...\n");
  83        show_free_areas();
  84        if(current->pid != 0) {
  85                local_irq_enable();
  86                sys_sync();
  87                local_irq_disable();
  88        }
  89        prom_printf("Returning to prom\n");
  90
  91        __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  92                             "nop\n\t"
  93                             "nop\n\t"
  94                             "nop\n\t" : : "r" (prom_tbr));
  95        local_irq_restore(flags);
  96
  97        return;
  98}
  99
 100static unsigned int boot_flags __initdata = 0;
 101#define BOOTME_DEBUG  0x1
 102
 103/* Exported for mm/init.c:paging_init. */
 104unsigned long cmdline_memory_size __initdata = 0;
 105
 106static void
 107prom_console_write(struct console *con, const char *s, unsigned n)
 108{
 109        prom_write(s, n);
 110}
 111
 112static struct console prom_debug_console = {
 113        .name =         "debug",
 114        .write =        prom_console_write,
 115        .flags =        CON_PRINTBUFFER,
 116        .index =        -1,
 117};
 118
 119/* 
 120 * Process kernel command line switches that are specific to the
 121 * SPARC or that require special low-level processing.
 122 */
 123static void __init process_switch(char c)
 124{
 125        switch (c) {
 126        case 'd':
 127                boot_flags |= BOOTME_DEBUG;
 128                break;
 129        case 's':
 130                break;
 131        case 'h':
 132                prom_printf("boot_flags_init: Halt!\n");
 133                prom_halt();
 134                break;
 135        case 'p':
 136                /* Use PROM debug console. */
 137                register_console(&prom_debug_console);
 138                break;
 139        default:
 140                printk("Unknown boot switch (-%c)\n", c);
 141                break;
 142        }
 143}
 144
 145static void __init boot_flags_init(char *commands)
 146{
 147        while (*commands) {
 148                /* Move to the start of the next "argument". */
 149                while (*commands && *commands == ' ')
 150                        commands++;
 151
 152                /* Process any command switches, otherwise skip it. */
 153                if (*commands == '\0')
 154                        break;
 155                if (*commands == '-') {
 156                        commands++;
 157                        while (*commands && *commands != ' ')
 158                                process_switch(*commands++);
 159                        continue;
 160                }
 161                if (!strncmp(commands, "mem=", 4)) {
 162                        /*
 163                         * "mem=XXX[kKmM] overrides the PROM-reported
 164                         * memory size.
 165                         */
 166                        cmdline_memory_size = simple_strtoul(commands + 4,
 167                                                     &commands, 0);
 168                        if (*commands == 'K' || *commands == 'k') {
 169                                cmdline_memory_size <<= 10;
 170                                commands++;
 171                        } else if (*commands=='M' || *commands=='m') {
 172                                cmdline_memory_size <<= 20;
 173                                commands++;
 174                        }
 175                }
 176                while (*commands && *commands != ' ')
 177                        commands++;
 178        }
 179}
 180
 181/* This routine will in the future do all the nasty prom stuff
 182 * to probe for the mmu type and its parameters, etc. This will
 183 * also be where SMP things happen.
 184 */
 185
 186extern void sun4c_probe_vac(void);
 187extern char cputypval;
 188extern unsigned long start, end;
 189
 190extern unsigned short root_flags;
 191extern unsigned short root_dev;
 192extern unsigned short ram_flags;
 193#define RAMDISK_IMAGE_START_MASK        0x07FF
 194#define RAMDISK_PROMPT_FLAG             0x8000
 195#define RAMDISK_LOAD_FLAG               0x4000
 196
 197extern int root_mountflags;
 198
 199char reboot_command[COMMAND_LINE_SIZE];
 200enum sparc_cpu sparc_cpu_model;
 201
 202struct tt_entry *sparc_ttable;
 203
 204struct pt_regs fake_swapper_regs;
 205
 206void __init setup_arch(char **cmdline_p)
 207{
 208        int i;
 209        unsigned long highest_paddr;
 210
 211        sparc_ttable = (struct tt_entry *) &start;
 212
 213        /* Initialize PROM console and command line. */
 214        *cmdline_p = prom_getbootargs();
 215        strcpy(boot_command_line, *cmdline_p);
 216
 217        /* Set sparc_cpu_model */
 218        sparc_cpu_model = sun_unknown;
 219        if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
 220        if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
 221        if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
 222        if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
 223        if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
 224        if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
 225        if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
 226
 227#ifdef CONFIG_SUN4
 228        if (sparc_cpu_model != sun4) {
 229                prom_printf("This kernel is for Sun4 architecture only.\n");
 230                prom_halt();
 231        }
 232#endif
 233        printk("ARCH: ");
 234        switch(sparc_cpu_model) {
 235        case sun4:
 236                printk("SUN4\n");
 237                break;
 238        case sun4c:
 239                printk("SUN4C\n");
 240                break;
 241        case sun4m:
 242                printk("SUN4M\n");
 243                break;
 244        case sun4d:
 245                printk("SUN4D\n");
 246                break;
 247        case sun4e:
 248                printk("SUN4E\n");
 249                break;
 250        case sun4u:
 251                printk("SUN4U\n");
 252                break;
 253        default:
 254                printk("UNKNOWN!\n");
 255                break;
 256        };
 257
 258#ifdef CONFIG_DUMMY_CONSOLE
 259        conswitchp = &dummy_con;
 260#elif defined(CONFIG_PROM_CONSOLE)
 261        conswitchp = &prom_con;
 262#endif
 263        boot_flags_init(*cmdline_p);
 264
 265        idprom_init();
 266        if (ARCH_SUN4C_SUN4)
 267                sun4c_probe_vac();
 268        load_mmu();
 269
 270        phys_base = 0xffffffffUL;
 271        highest_paddr = 0UL;
 272        for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 273                unsigned long top;
 274
 275                if (sp_banks[i].base_addr < phys_base)
 276                        phys_base = sp_banks[i].base_addr;
 277                top = sp_banks[i].base_addr +
 278                        sp_banks[i].num_bytes;
 279                if (highest_paddr < top)
 280                        highest_paddr = top;
 281        }
 282        pfn_base = phys_base >> PAGE_SHIFT;
 283
 284        if (!root_flags)
 285                root_mountflags &= ~MS_RDONLY;
 286        ROOT_DEV = old_decode_dev(root_dev);
 287#ifdef CONFIG_BLK_DEV_RAM
 288        rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 289        rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 290        rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);     
 291#endif
 292
 293        prom_setsync(prom_sync_me);
 294
 295        if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 
 296           ((*(short *)linux_dbvec) != -1)) {
 297                printk("Booted under KADB. Syncing trap table.\n");
 298                (*(linux_dbvec->teach_debugger))();
 299        }
 300
 301        init_mm.context = (unsigned long) NO_CONTEXT;
 302        init_task.thread.kregs = &fake_swapper_regs;
 303
 304        paging_init();
 305
 306        smp_setup_cpu_possible_map();
 307}
 308
 309extern char *sparc_cpu_type;
 310extern char *sparc_fpu_type;
 311
 312static int ncpus_probed;
 313
 314static int show_cpuinfo(struct seq_file *m, void *__unused)
 315{
 316        seq_printf(m,
 317                   "cpu\t\t: %s\n"
 318                   "fpu\t\t: %s\n"
 319                   "promlib\t\t: Version %d Revision %d\n"
 320                   "prom\t\t: %d.%d\n"
 321                   "type\t\t: %s\n"
 322                   "ncpus probed\t: %d\n"
 323                   "ncpus active\t: %d\n"
 324#ifndef CONFIG_SMP
 325                   "CPU0Bogo\t: %lu.%02lu\n"
 326                   "CPU0ClkTck\t: %ld\n"
 327#endif
 328                   ,
 329                   sparc_cpu_type ? sparc_cpu_type : "undetermined",
 330                   sparc_fpu_type ? sparc_fpu_type : "undetermined",
 331                   romvec->pv_romvers,
 332                   prom_rev,
 333                   romvec->pv_printrev >> 16,
 334                   romvec->pv_printrev & 0xffff,
 335                   &cputypval,
 336                   ncpus_probed,
 337                   num_online_cpus()
 338#ifndef CONFIG_SMP
 339                   , cpu_data(0).udelay_val/(500000/HZ),
 340                   (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 341                   cpu_data(0).clock_tick
 342#endif
 343                );
 344
 345#ifdef CONFIG_SMP
 346        smp_bogo(m);
 347#endif
 348        mmu_info(m);
 349#ifdef CONFIG_SMP
 350        smp_info(m);
 351#endif
 352        return 0;
 353}
 354
 355static void *c_start(struct seq_file *m, loff_t *pos)
 356{
 357        /* The pointer we are returning is arbitrary,
 358         * it just has to be non-NULL and not IS_ERR
 359         * in the success case.
 360         */
 361        return *pos == 0 ? &c_start : NULL;
 362}
 363
 364static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 365{
 366        ++*pos;
 367        return c_start(m, pos);
 368}
 369
 370static void c_stop(struct seq_file *m, void *v)
 371{
 372}
 373
 374const struct seq_operations cpuinfo_op = {
 375        .start =c_start,
 376        .next = c_next,
 377        .stop = c_stop,
 378        .show = show_cpuinfo,
 379};
 380
 381extern int stop_a_enabled;
 382
 383void sun_do_break(void)
 384{
 385        if (!stop_a_enabled)
 386                return;
 387
 388        printk("\n");
 389        flush_user_windows();
 390
 391        prom_cmdline();
 392}
 393
 394int stop_a_enabled = 1;
 395
 396static int __init topology_init(void)
 397{
 398        int i, ncpus, err;
 399
 400        /* Count the number of physically present processors in
 401         * the machine, even on uniprocessor, so that /proc/cpuinfo
 402         * output is consistent with 2.4.x
 403         */
 404        ncpus = 0;
 405        while (!cpu_find_by_instance(ncpus, NULL, NULL))
 406                ncpus++;
 407        ncpus_probed = ncpus;
 408
 409        err = 0;
 410        for_each_online_cpu(i) {
 411                struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 412                if (!p)
 413                        err = -ENOMEM;
 414                else
 415                        register_cpu(p, i);
 416        }
 417
 418        return err;
 419}
 420
 421subsys_initcall(topology_init);
 422