arch/sparc/kernel/setup.c

   1 /*  $Id: setup.c,v 1.126 2001/11/13 00:49:27 davem Exp $
   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/a.out.h>
  20 #include <linux/screen_info.h>
  21 #include <linux/delay.h>
  22 #include <linux/fs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/kdev_t.h>
  26 #include <linux/major.h>
  27 #include <linux/string.h>
  28 #include <linux/init.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/console.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/root_dev.h>
  33 #include <linux/cpu.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/kdebug.h>
  44 #include <asm/mbus.h>
  45 #include <asm/idprom.h>
  46 #include <asm/machines.h>
  47 #include <asm/cpudata.h>
  48 #include <asm/setup.h>
  49
  50 struct screen_info screen_info = {
  51         0, 0,                   /* orig-x, orig-y */
  52         0,                      /* unused */
  53         0,                      /* orig-video-page */
  54         0,                      /* orig-video-mode */
  55         128,                    /* orig-video-cols */
  56         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  57         54,                     /* orig-video-lines */
  58         0,                      /* orig-video-isVGA */
  59         16                      /* orig-video-points */
  60 };
  61
  62 /* Typing sync at the prom prompt calls the function pointed to by
  63  * romvec->pv_synchook which I set to the following function.
  64  * This should sync all filesystems and return, for now it just
  65  * prints out pretty messages and returns.
  66  */
  67
  68 extern unsigned long trapbase;
  69 void (*prom_palette)(int);
  70
  71 /* Pretty sick eh? */
  72 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         if (prom_palette)
  85                 prom_palette(1);
  86         prom_printf("PROM SYNC COMMAND...\n");
  87         show_free_areas();
  88         if(current->pid != 0) {
  89                 local_irq_enable();
  90                 sys_sync();
  91                 local_irq_disable();
  92         }
  93         prom_printf("Returning to prom\n");
  94
  95         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  96                              "nop\n\t"
  97                              "nop\n\t"
  98                              "nop\n\t" : : "r" (prom_tbr));
  99         local_irq_restore(flags);
 100
 101         return;
 102 }
 103
 104 unsigned int boot_flags __initdata = 0;
 105 #define BOOTME_DEBUG  0x1
 106 #define BOOTME_SINGLE 0x2
 107
 108 /* Exported for mm/init.c:paging_init. */
 109 unsigned long cmdline_memory_size __initdata = 0;
 110
 111 static void
 112 prom_console_write(struct console *con, const char *s, unsigned n)
 113 {
 114         prom_write(s, n);
 115 }
 116
 117 static struct console prom_debug_console = {
 118         .name =         "debug",
 119         .write =        prom_console_write,
 120         .flags =        CON_PRINTBUFFER,
 121         .index =        -1,
 122 };
 123
 124 /*
 125  * Process kernel command line switches that are specific to the
 126  * SPARC or that require special low-level processing.
 127  */
 128 static void __init process_switch(char c)
 129 {
 130         switch (c) {
 131         case 'd':
 132                 boot_flags |= BOOTME_DEBUG;
 133                 break;
 134         case 's':
 135                 boot_flags |= BOOTME_SINGLE;
 136                 break;
 137         case 'h':
 138                 prom_printf("boot_flags_init: Halt!\n");
 139                 prom_halt();
 140                 break;
 141         case 'p':
 142                 /* Use PROM debug console. */
 143                 register_console(&prom_debug_console);
 144                 break;
 145         default:
 146                 printk("Unknown boot switch (-%c)\n", c);
 147                 break;
 148         }
 149 }
 150
 151 static void __init process_console(char *commands)
 152 {
 153         serial_console = 0;
 154         commands += 8;
 155         /* Linux-style serial */
 156         if (!strncmp(commands, "ttyS", 4))
 157                 serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
 158         else if (!strncmp(commands, "tty", 3)) {
 159                 char c = *(commands + 3);
 160                 /* Solaris-style serial */
 161                 if (c == 'a' || c == 'b')
 162                         serial_console = c - 'a' + 1;
 163                 /* else Linux-style fbcon, not serial */
 164         }
 165 #if defined(CONFIG_PROM_CONSOLE)
 166         if (!strncmp(commands, "prom", 4)) {
 167                 char *p;
 168
 169                 for (p = commands - 8; *p && *p != ' '; p++)
 170                         *p = ' ';
 171                 conswitchp = &prom_con;
 172         }
 173 #endif
 174 }
 175
 176 static void __init boot_flags_init(char *commands)
 177 {
 178         while (*commands) {
 179                 /* Move to the start of the next "argument". */
 180                 while (*commands && *commands == ' ')
 181                         commands++;
 182
 183                 /* Process any command switches, otherwise skip it. */
 184                 if (*commands == '\0')
 185                         break;
 186                 if (*commands == '-') {
 187                         commands++;
 188                         while (*commands && *commands != ' ')
 189                                 process_switch(*commands++);
 190                         continue;
 191                 }
 192                 if (!strncmp(commands, "console=", 8)) {
 193                         process_console(commands);
 194                 } else if (!strncmp(commands, "mem=", 4)) {
 195                         /*
 196                          * "mem=XXX[kKmM] overrides the PROM-reported
 197                          * memory size.
 198                          */
 199                         cmdline_memory_size = simple_strtoul(commands + 4,
 200                                                      &commands, 0);
 201                         if (*commands == 'K' || *commands == 'k') {
 202                                 cmdline_memory_size <<= 10;
 203                                 commands++;
 204                         } else if (*commands=='M' || *commands=='m') {
 205                                 cmdline_memory_size <<= 20;
 206                                 commands++;
 207                         }
 208                 }
 209                 while (*commands && *commands != ' ')
 210                         commands++;
 211         }
 212 }
 213
 214 /* This routine will in the future do all the nasty prom stuff
 215  * to probe for the mmu type and its parameters, etc. This will
 216  * also be where SMP things happen plus the Sparc specific memory
 217  * physical memory probe as on the alpha.
 218  */
 219
 220 extern int prom_probe_memory(void);
 221 extern void sun4c_probe_vac(void);
 222 extern char cputypval;
 223 extern unsigned long start, end;
 224 extern void panic_setup(char *, int *);
 225
 226 extern unsigned short root_flags;
 227 extern unsigned short root_dev;
 228 extern unsigned short ram_flags;
 229 #define RAMDISK_IMAGE_START_MASK        0x07FF
 230 #define RAMDISK_PROMPT_FLAG             0x8000
 231 #define RAMDISK_LOAD_FLAG               0x4000
 232
 233 extern int root_mountflags;
 234
 235 char reboot_command[COMMAND_LINE_SIZE];
 236 enum sparc_cpu sparc_cpu_model;
 237
 238 struct tt_entry *sparc_ttable;
 239
 240 struct pt_regs fake_swapper_regs;
 241
 242 void __init setup_arch(char **cmdline_p)
 243 {
 244         int i;
 245         unsigned long highest_paddr;
 246
 247         sparc_ttable = (struct tt_entry *) &start;
 248
 249         /* Initialize PROM console and command line. */
 250         *cmdline_p = prom_getbootargs();
 251         strcpy(saved_command_line, *cmdline_p);
 252
 253         /* Set sparc_cpu_model */
 254         sparc_cpu_model = sun_unknown;
 255         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
 256         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
 257         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
 258         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
 259         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
 260         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
 261         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
 262
 263 #ifdef CONFIG_SUN4
 264         if (sparc_cpu_model != sun4) {
 265                 prom_printf("This kernel is for Sun4 architecture only.\n");
 266                 prom_halt();
 267         }
 268 #endif
 269         printk("ARCH: ");
 270         switch(sparc_cpu_model) {
 271         case sun4:
 272                 printk("SUN4\n");
 273                 break;
 274         case sun4c:
 275                 printk("SUN4C\n");
 276                 break;
 277         case sun4m:
 278                 printk("SUN4M\n");
 279                 break;
 280         case sun4d:
 281                 printk("SUN4D\n");
 282                 break;
 283         case sun4e:
 284                 printk("SUN4E\n");
 285                 break;
 286         case sun4u:
 287                 printk("SUN4U\n");
 288                 break;
 289         default:
 290                 printk("UNKNOWN!\n");
 291                 break;
 292         };
 293
 294 #ifdef CONFIG_DUMMY_CONSOLE
 295         conswitchp = &dummy_con;
 296 #elif defined(CONFIG_PROM_CONSOLE)
 297         conswitchp = &prom_con;
 298 #endif
 299         boot_flags_init(*cmdline_p);
 300
 301         idprom_init();
 302         if (ARCH_SUN4C_SUN4)
 303                 sun4c_probe_vac();
 304         load_mmu();
 305         (void) prom_probe_memory();
 306
 307         phys_base = 0xffffffffUL;
 308         highest_paddr = 0UL;
 309         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 310                 unsigned long top;
 311
 312                 if (sp_banks[i].base_addr < phys_base)
 313                         phys_base = sp_banks[i].base_addr;
 314                 top = sp_banks[i].base_addr +
 315                         sp_banks[i].num_bytes;
 316                 if (highest_paddr < top)
 317                         highest_paddr = top;
 318         }
 319         pfn_base = phys_base >> PAGE_SHIFT;
 320
 321         if (!root_flags)
 322                 root_mountflags &= ~MS_RDONLY;
 323         ROOT_DEV = old_decode_dev(root_dev);
 324 #ifdef CONFIG_BLK_DEV_RAM
 325         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 326         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 327         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 328 #endif
 329
 330         prom_setsync(prom_sync_me);
 331
 332         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 333            ((*(short *)linux_dbvec) != -1)) {
 334                 printk("Booted under KADB. Syncing trap table.\n");
 335                 (*(linux_dbvec->teach_debugger))();
 336         }
 337
 338         init_mm.context = (unsigned long) NO_CONTEXT;
 339         init_task.thread.kregs = &fake_swapper_regs;
 340
 341         paging_init();
 342
 343         smp_setup_cpu_possible_map();
 344 }
 345
 346 static int __init set_preferred_console(void)
 347 {
 348         int idev, odev;
 349
 350         /* The user has requested a console so this is already set up. */
 351         if (serial_console >= 0)
 352                 return -EBUSY;
 353
 354         idev = prom_query_input_device();
 355         odev = prom_query_output_device();
 356         if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
 357                 serial_console = 0;
 358         } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
 359                 serial_console = 1;
 360         } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
 361                 serial_console = 2;
 362         } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
 363                 prom_printf("MrCoffee ttya\n");
 364                 serial_console = 1;
 365         } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
 366                 serial_console = 0;
 367                 prom_printf("MrCoffee keyboard\n");
 368         } else {
 369                 prom_printf("Confusing console (idev %d, odev %d)\n",
 370                     idev, odev);
 371                 serial_console = 1;
 372         }
 373
 374         if (serial_console)
 375                 return add_preferred_console("ttyS", serial_console - 1, NULL);
 376
 377         return -ENODEV;
 378 }
 379 console_initcall(set_preferred_console);
 380
 381 extern char *sparc_cpu_type;
 382 extern char *sparc_fpu_type;
 383
 384 static int ncpus_probed;
 385
 386 static int show_cpuinfo(struct seq_file *m, void *__unused)
 387 {
 388         seq_printf(m,
 389                    "cpu\t\t: %s\n"
 390                    "fpu\t\t: %s\n"
 391                    "promlib\t\t: Version %d Revision %d\n"
 392                    "prom\t\t: %d.%d\n"
 393                    "type\t\t: %s\n"
 394                    "ncpus probed\t: %d\n"
 395                    "ncpus active\t: %d\n"
 396 #ifndef CONFIG_SMP
 397                    "CPU0Bogo\t: %lu.%02lu\n"
 398                    "CPU0ClkTck\t: %ld\n"
 399 #endif
 400                    ,
 401                    sparc_cpu_type ? sparc_cpu_type : "undetermined",
 402                    sparc_fpu_type ? sparc_fpu_type : "undetermined",
 403                    romvec->pv_romvers,
 404                    prom_rev,
 405                    romvec->pv_printrev >> 16,
 406                    romvec->pv_printrev & 0xffff,
 407                    &cputypval,
 408                    ncpus_probed,
 409                    num_online_cpus()
 410 #ifndef CONFIG_SMP
 411                    , cpu_data(0).udelay_val/(500000/HZ),
 412                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 413                    cpu_data(0).clock_tick
 414 #endif
 415                 );
 416
 417 #ifdef CONFIG_SMP
 418         smp_bogo(m);
 419 #endif
 420         mmu_info(m);
 421 #ifdef CONFIG_SMP
 422         smp_info(m);
 423 #endif
 424         return 0;
 425 }
 426
 427 static void *c_start(struct seq_file *m, loff_t *pos)
 428 {
 429         /* The pointer we are returning is arbitrary,
 430          * it just has to be non-NULL and not IS_ERR
 431          * in the success case.
 432          */
 433         return *pos == 0 ? &c_start : NULL;
 434 }
 435
 436 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 437 {
 438         ++*pos;
 439         return c_start(m, pos);
 440 }
 441
 442 static void c_stop(struct seq_file *m, void *v)
 443 {
 444 }
 445
 446 struct seq_operations cpuinfo_op = {
 447         .start =c_start,
 448         .next = c_next,
 449         .stop = c_stop,
 450         .show = show_cpuinfo,
 451 };
 452
 453 extern int stop_a_enabled;
 454
 455 void sun_do_break(void)
 456 {
 457         if (!stop_a_enabled)
 458                 return;
 459
 460         printk("\n");
 461         flush_user_windows();
 462
 463         prom_cmdline();
 464 }
 465
 466 int serial_console = -1;
 467 int stop_a_enabled = 1;
 468
 469 static int __init topology_init(void)
 470 {
 471         int i, ncpus, err;
 472
 473         /* Count the number of physically present processors in
 474          * the machine, even on uniprocessor, so that /proc/cpuinfo
 475          * output is consistent with 2.4.x
 476          */
 477         ncpus = 0;
 478         while (!cpu_find_by_instance(ncpus, NULL, NULL))
 479                 ncpus++;
 480         ncpus_probed = ncpus;
 481
 482         err = 0;
 483         for_each_online_cpu(i) {
 484                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 485                 if (!p)
 486                         err = -ENOMEM;
 487                 else
 488                         register_cpu(p, i);
 489         }
 490
 491         return err;
 492 }
 493
 494 subsys_initcall(topology_init);