arch/sparc/kernel/setup_32.c

   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
  49 #include "kernel.h"
  50
  51 struct screen_info screen_info = {
  52         0, 0,                   /* orig-x, orig-y */
  53         0,                      /* unused */
  54         0,                      /* orig-video-page */
  55         0,                      /* orig-video-mode */
  56         128,                    /* orig-video-cols */
  57         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  58         54,                     /* orig-video-lines */
  59         0,                      /* orig-video-isVGA */
  60         16                      /* orig-video-points */
  61 };
  62
  63 /* Typing sync at the prom prompt calls the function pointed to by
  64  * romvec->pv_synchook which I set to the following function.
  65  * This should sync all filesystems and return, for now it just
  66  * prints out pretty messages and returns.
  67  */
  68
  69 extern unsigned long trapbase;
  70
  71 /* Pretty sick eh? */
  72 static void prom_sync_me(void)
  73 {
  74         unsigned long prom_tbr, flags;
  75
  76         /* XXX Badly broken. FIX! - Anton */
  77         local_irq_save(flags);
  78         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
  79         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  80                              "nop\n\t"
  81                              "nop\n\t"
  82                              "nop\n\t" : : "r" (&trapbase));
  83
  84         prom_printf("PROM SYNC COMMAND...\n");
  85         show_free_areas();
  86         if(current->pid != 0) {
  87                 local_irq_enable();
  88                 sys_sync();
  89                 local_irq_disable();
  90         }
  91         prom_printf("Returning to prom\n");
  92
  93         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  94                              "nop\n\t"
  95                              "nop\n\t"
  96                              "nop\n\t" : : "r" (prom_tbr));
  97         local_irq_restore(flags);
  98 }
  99
 100 static unsigned int boot_flags __initdata = 0;
 101 #define BOOTME_DEBUG  0x1
 102
 103 /* Exported for mm/init.c:paging_init. */
 104 unsigned long cmdline_memory_size __initdata = 0;
 105
 106 static void
 107 prom_console_write(struct console *con, const char *s, unsigned n)
 108 {
 109         prom_write(s, n);
 110 }
 111
 112 static 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  */
 123 static 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
 145 static 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
 186 extern void sun4c_probe_vac(void);
 187
 188 extern unsigned short root_flags;
 189 extern unsigned short root_dev;
 190 extern unsigned short ram_flags;
 191 #define RAMDISK_IMAGE_START_MASK        0x07FF
 192 #define RAMDISK_PROMPT_FLAG             0x8000
 193 #define RAMDISK_LOAD_FLAG               0x4000
 194
 195 extern int root_mountflags;
 196
 197 char reboot_command[COMMAND_LINE_SIZE];
 198
 199 enum sparc_cpu sparc_cpu_model;
 200 EXPORT_SYMBOL(sparc_cpu_model);
 201
 202 struct tt_entry *sparc_ttable;
 203
 204 struct pt_regs fake_swapper_regs;
 205
 206 void __init setup_arch(char **cmdline_p)
 207 {
 208         int i;
 209         unsigned long highest_paddr;
 210
 211         sparc_ttable = (struct tt_entry *) &trapbase;
 212
 213         /* Initialize PROM console and command line. */
 214         *cmdline_p = prom_getbootargs();
 215         strcpy(boot_command_line, *cmdline_p);
 216         parse_early_param();
 217
 218         /* Set sparc_cpu_model */
 219         sparc_cpu_model = sun_unknown;
 220         if (!strcmp(&cputypval[0], "sun4 "))
 221                 sparc_cpu_model = sun4;
 222         if (!strcmp(&cputypval[0], "sun4c"))
 223                 sparc_cpu_model = sun4c;
 224         if (!strcmp(&cputypval[0], "sun4m"))
 225                 sparc_cpu_model = sun4m;
 226         if (!strcmp(&cputypval[0], "sun4s"))
 227                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
 228         if (!strcmp(&cputypval[0], "sun4d"))
 229                 sparc_cpu_model = sun4d;
 230         if (!strcmp(&cputypval[0], "sun4e"))
 231                 sparc_cpu_model = sun4e;
 232         if (!strcmp(&cputypval[0], "sun4u"))
 233                 sparc_cpu_model = sun4u;
 234         if (!strncmp(&cputypval[0], "leon" , 4))
 235                 sparc_cpu_model = sparc_leon;
 236
 237         printk("ARCH: ");
 238         switch(sparc_cpu_model) {
 239         case sun4:
 240                 printk("SUN4\n");
 241                 break;
 242         case sun4c:
 243                 printk("SUN4C\n");
 244                 break;
 245         case sun4m:
 246                 printk("SUN4M\n");
 247                 break;
 248         case sun4d:
 249                 printk("SUN4D\n");
 250                 break;
 251         case sun4e:
 252                 printk("SUN4E\n");
 253                 break;
 254         case sun4u:
 255                 printk("SUN4U\n");
 256                 break;
 257         case sparc_leon:
 258                 printk("LEON\n");
 259                 break;
 260         default:
 261                 printk("UNKNOWN!\n");
 262                 break;
 263         };
 264
 265 #ifdef CONFIG_DUMMY_CONSOLE
 266         conswitchp = &dummy_con;
 267 #endif
 268         boot_flags_init(*cmdline_p);
 269
 270         idprom_init();
 271         if (ARCH_SUN4C)
 272                 sun4c_probe_vac();
 273         load_mmu();
 274
 275         phys_base = 0xffffffffUL;
 276         highest_paddr = 0UL;
 277         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 278                 unsigned long top;
 279
 280                 if (sp_banks[i].base_addr < phys_base)
 281                         phys_base = sp_banks[i].base_addr;
 282                 top = sp_banks[i].base_addr +
 283                         sp_banks[i].num_bytes;
 284                 if (highest_paddr < top)
 285                         highest_paddr = top;
 286         }
 287         pfn_base = phys_base >> PAGE_SHIFT;
 288
 289         if (!root_flags)
 290                 root_mountflags &= ~MS_RDONLY;
 291         ROOT_DEV = old_decode_dev(root_dev);
 292 #ifdef CONFIG_BLK_DEV_RAM
 293         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 294         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 295         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 296 #endif
 297
 298         prom_setsync(prom_sync_me);
 299
 300         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 301            ((*(short *)linux_dbvec) != -1)) {
 302                 printk("Booted under KADB. Syncing trap table.\n");
 303                 (*(linux_dbvec->teach_debugger))();
 304         }
 305
 306         init_mm.context = (unsigned long) NO_CONTEXT;
 307         init_task.thread.kregs = &fake_swapper_regs;
 308
 309         paging_init();
 310
 311         smp_setup_cpu_possible_map();
 312 }
 313
 314 static int ncpus_probed;
 315
 316 static int show_cpuinfo(struct seq_file *m, void *__unused)
 317 {
 318         seq_printf(m,
 319                    "cpu\t\t: %s\n"
 320                    "fpu\t\t: %s\n"
 321                    "promlib\t\t: Version %d Revision %d\n"
 322                    "prom\t\t: %d.%d\n"
 323                    "type\t\t: %s\n"
 324                    "ncpus probed\t: %d\n"
 325                    "ncpus active\t: %d\n"
 326 #ifndef CONFIG_SMP
 327                    "CPU0Bogo\t: %lu.%02lu\n"
 328                    "CPU0ClkTck\t: %ld\n"
 329 #endif
 330                    ,
 331                    sparc_cpu_type,
 332                    sparc_fpu_type ,
 333                    romvec->pv_romvers,
 334                    prom_rev,
 335                    romvec->pv_printrev >> 16,
 336                    romvec->pv_printrev & 0xffff,
 337                    &cputypval[0],
 338                    ncpus_probed,
 339                    num_online_cpus()
 340 #ifndef CONFIG_SMP
 341                    , cpu_data(0).udelay_val/(500000/HZ),
 342                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 343                    cpu_data(0).clock_tick
 344 #endif
 345                 );
 346
 347 #ifdef CONFIG_SMP
 348         smp_bogo(m);
 349 #endif
 350         mmu_info(m);
 351 #ifdef CONFIG_SMP
 352         smp_info(m);
 353 #endif
 354         return 0;
 355 }
 356
 357 static void *c_start(struct seq_file *m, loff_t *pos)
 358 {
 359         /* The pointer we are returning is arbitrary,
 360          * it just has to be non-NULL and not IS_ERR
 361          * in the success case.
 362          */
 363         return *pos == 0 ? &c_start : NULL;
 364 }
 365
 366 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 367 {
 368         ++*pos;
 369         return c_start(m, pos);
 370 }
 371
 372 static void c_stop(struct seq_file *m, void *v)
 373 {
 374 }
 375
 376 const struct seq_operations cpuinfo_op = {
 377         .start =c_start,
 378         .next = c_next,
 379         .stop = c_stop,
 380         .show = show_cpuinfo,
 381 };
 382
 383 extern int stop_a_enabled;
 384
 385 void sun_do_break(void)
 386 {
 387         if (!stop_a_enabled)
 388                 return;
 389
 390         printk("\n");
 391         flush_user_windows();
 392
 393         prom_cmdline();
 394 }
 395 EXPORT_SYMBOL(sun_do_break);
 396
 397 int stop_a_enabled = 1;
 398
 399 static int __init topology_init(void)
 400 {
 401         int i, ncpus, err;
 402
 403         /* Count the number of physically present processors in
 404          * the machine, even on uniprocessor, so that /proc/cpuinfo
 405          * output is consistent with 2.4.x
 406          */
 407         ncpus = 0;
 408         while (!cpu_find_by_instance(ncpus, NULL, NULL))
 409                 ncpus++;
 410         ncpus_probed = ncpus;
 411
 412         err = 0;
 413         for_each_online_cpu(i) {
 414                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 415                 if (!p)
 416                         err = -ENOMEM;
 417                 else
 418                         register_cpu(p, i);
 419         }
 420
 421         return err;
 422 }
 423
 424 subsys_initcall(topology_init);