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 <asm/smp.h>
  17 #include <linux/user.h>
  18 #include <linux/a.out.h>
  19 #include <linux/tty.h>
  20 #include <linux/delay.h>
  21 #include <linux/config.h>
  22 #include <linux/fs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/kdev_t.h>
  25 #include <linux/major.h>
  26 #include <linux/string.h>
  27 #include <linux/blk.h>
  28 #include <linux/init.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/console.h>
  31 #include <linux/spinlock.h>
  32
  33 #include <asm/segment.h>
  34 #include <asm/system.h>
  35 #include <asm/io.h>
  36 #include <asm/kgdb.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/softirq.h>
  47 #include <asm/hardirq.h>
  48 #include <asm/machines.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 extern int serial_console;
  70 extern void breakpoint(void);
  71 #if CONFIG_SUN_CONSOLE
  72 void (*prom_palette)(int);
  73 #endif
  74 asmlinkage void sys_sync(void); /* it's really int */
  75
  76 /* Pretty sick eh? */
  77 void prom_sync_me(void)
  78 {
  79         unsigned long prom_tbr, flags;
  80
  81         /* XXX Badly broken. FIX! - Anton */
  82         save_and_cli(flags);
  83         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
  84         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  85                              "nop\n\t"
  86                              "nop\n\t"
  87                              "nop\n\t" : : "r" (&trapbase));
  88
  89 #ifdef CONFIG_SUN_CONSOLE
  90         if (prom_palette)
  91                 prom_palette(1);
  92 #endif
  93         prom_printf("PROM SYNC COMMAND...\n");
  94         show_free_areas();
  95         if(current->pid != 0) {
  96                 sti();
  97                 sys_sync();
  98                 cli();
  99         }
 100         prom_printf("Returning to prom\n");
 101
 102         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
 103                              "nop\n\t"
 104                              "nop\n\t"
 105                              "nop\n\t" : : "r" (prom_tbr));
 106         restore_flags(flags);
 107
 108         return;
 109 }
 110
 111 extern void rs_kgdb_hook(int tty_num); /* sparc/serial.c */
 112
 113 unsigned int boot_flags __initdata = 0;
 114 #define BOOTME_DEBUG  0x1
 115 #define BOOTME_SINGLE 0x2
 116 #define BOOTME_KGDBA  0x4
 117 #define BOOTME_KGDBB  0x8
 118 #define BOOTME_KGDB   0xc
 119
 120 #ifdef CONFIG_SUN_CONSOLE
 121 static int console_fb __initdata = 0;
 122 #endif
 123
 124 /* Exported for mm/init.c:paging_init. */
 125 unsigned long cmdline_memory_size __initdata = 0;
 126
 127 void kernel_enter_debugger(void)
 128 {
 129         if (boot_flags & BOOTME_KGDB) {
 130                 printk("KGDB: Entered\n");
 131                 breakpoint();
 132         }
 133 }
 134
 135 static void
 136 prom_console_write(struct console *con, const char *s, unsigned n)
 137 {
 138         prom_printf("%s", s);
 139 }
 140
 141 static struct console prom_debug_console = {
 142         name:           "debug",
 143         write:          prom_console_write,
 144         flags:          CON_PRINTBUFFER,
 145         index:          -1,
 146 };
 147
 148 int obp_system_intr(void)
 149 {
 150         if (boot_flags & BOOTME_KGDB) {
 151                 printk("KGDB: system interrupted\n");
 152                 breakpoint();
 153                 return 1;
 154         }
 155         if (boot_flags & BOOTME_DEBUG) {
 156                 printk("OBP: system interrupted\n");
 157                 prom_halt();
 158                 return 1;
 159         }
 160         return 0;
 161 }
 162
 163 /*
 164  * Process kernel command line switches that are specific to the
 165  * SPARC or that require special low-level processing.
 166  */
 167 static void __init process_switch(char c)
 168 {
 169         switch (c) {
 170         case 'd':
 171                 boot_flags |= BOOTME_DEBUG;
 172                 break;
 173         case 's':
 174                 boot_flags |= BOOTME_SINGLE;
 175                 break;
 176         case 'h':
 177                 prom_printf("boot_flags_init: Halt!\n");
 178                 prom_halt();
 179                 break;
 180         case 'p':
 181                 /* Use PROM debug console. */
 182                 register_console(&prom_debug_console);
 183                 break;
 184         default:
 185                 printk("Unknown boot switch (-%c)\n", c);
 186                 break;
 187         }
 188 }
 189
 190 static void __init boot_flags_init(char *commands)
 191 {
 192         while (*commands) {
 193                 /* Move to the start of the next "argument". */
 194                 while (*commands && *commands == ' ')
 195                         commands++;
 196
 197                 /* Process any command switches, otherwise skip it. */
 198                 if (*commands == '\0')
 199                         break;
 200                 else if (*commands == '-') {
 201                         commands++;
 202                         while (*commands && *commands != ' ')
 203                                 process_switch(*commands++);
 204                 } else if (strlen(commands) >= 9
 205                            && !strncmp(commands, "kgdb=tty", 8)) {
 206                         switch (commands[8]) {
 207 #ifdef CONFIG_SUN_SERIAL
 208                         case 'a':
 209                                 boot_flags |= BOOTME_KGDBA;
 210                                 prom_printf("KGDB: Using serial line /dev/ttya.\n");
 211                                 break;
 212                         case 'b':
 213                                 boot_flags |= BOOTME_KGDBB;
 214                                 prom_printf("KGDB: Using serial line /dev/ttyb.\n");
 215                                 break;
 216 #endif
 217                         default:
 218                                 printk("KGDB: Unknown tty line.\n");
 219                                 break;
 220                         }
 221                         commands += 9;
 222                 } else {
 223 #if CONFIG_SUN_CONSOLE
 224                         if (!strncmp(commands, "console=", 8)) {
 225                                 commands += 8;
 226                                 if (!strncmp (commands, "ttya", 4)) {
 227                                         console_fb = 2;
 228                                         prom_printf ("Using /dev/ttya as console.\n");
 229                                 } else if (!strncmp (commands, "ttyb", 4)) {
 230                                         console_fb = 3;
 231                                         prom_printf ("Using /dev/ttyb as console.\n");
 232 #if defined(CONFIG_PROM_CONSOLE)
 233                                 } else if (!strncmp (commands, "prom", 4)) {
 234                                         char *p;
 235
 236                                         for (p = commands - 8; *p && *p != ' '; p++)
 237                                                 *p = ' ';
 238                                         conswitchp = &prom_con;
 239                                         console_fb = 1;
 240 #endif
 241                                 } else {
 242                                         console_fb = 1;
 243                                 }
 244                         } else
 245 #endif
 246                         if (!strncmp(commands, "mem=", 4)) {
 247                                 /*
 248                                  * "mem=XXX[kKmM] overrides the PROM-reported
 249                                  * memory size.
 250                                  */
 251                                 cmdline_memory_size = simple_strtoul(commands + 4,
 252                                                              &commands, 0);
 253                                 if (*commands == 'K' || *commands == 'k') {
 254                                         cmdline_memory_size <<= 10;
 255                                         commands++;
 256                                 } else if (*commands=='M' || *commands=='m') {
 257                                         cmdline_memory_size <<= 20;
 258                                         commands++;
 259                                 }
 260                         }
 261                         while (*commands && *commands != ' ')
 262                                 commands++;
 263                 }
 264         }
 265 }
 266
 267 /* This routine will in the future do all the nasty prom stuff
 268  * to probe for the mmu type and its parameters, etc. This will
 269  * also be where SMP things happen plus the Sparc specific memory
 270  * physical memory probe as on the alpha.
 271  */
 272
 273 extern int prom_probe_memory(void);
 274 extern void sun4c_probe_vac(void);
 275 extern char cputypval;
 276 extern unsigned long start, end;
 277 extern void panic_setup(char *, int *);
 278 extern void srmmu_end_memory(unsigned long, unsigned long *);
 279 extern void sun_serial_setup(void);
 280
 281 extern unsigned short root_flags;
 282 extern unsigned short root_dev;
 283 extern unsigned short ram_flags;
 284 #define RAMDISK_IMAGE_START_MASK        0x07FF
 285 #define RAMDISK_PROMPT_FLAG             0x8000
 286 #define RAMDISK_LOAD_FLAG               0x4000
 287
 288 extern int root_mountflags;
 289
 290 char saved_command_line[256];
 291 char reboot_command[256];
 292 enum sparc_cpu sparc_cpu_model;
 293
 294 struct tt_entry *sparc_ttable;
 295
 296 struct pt_regs fake_swapper_regs;
 297
 298 extern void paging_init(void);
 299
 300 void __init setup_arch(char **cmdline_p)
 301 {
 302         int i;
 303         unsigned long highest_paddr;
 304
 305         sparc_ttable = (struct tt_entry *) &start;
 306
 307         /* Initialize PROM console and command line. */
 308         *cmdline_p = prom_getbootargs();
 309         strcpy(saved_command_line, *cmdline_p);
 310
 311         /* Set sparc_cpu_model */
 312         sparc_cpu_model = sun_unknown;
 313         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
 314         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
 315         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
 316         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
 317         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
 318         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
 319         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
 320
 321 #ifdef CONFIG_SUN4
 322         if (sparc_cpu_model != sun4) {
 323                 prom_printf("This kernel is for Sun4 architecture only.\n");
 324                 prom_halt();
 325         }
 326 #endif
 327         printk("ARCH: ");
 328         switch(sparc_cpu_model) {
 329         case sun4:
 330                 printk("SUN4\n");
 331                 break;
 332         case sun4c:
 333                 printk("SUN4C\n");
 334                 break;
 335         case sun4m:
 336                 printk("SUN4M\n");
 337                 break;
 338         case sun4d:
 339                 printk("SUN4D\n");
 340                 break;
 341         case sun4e:
 342                 printk("SUN4E\n");
 343                 break;
 344         case sun4u:
 345                 printk("SUN4U\n");
 346                 break;
 347         default:
 348                 printk("UNKNOWN!\n");
 349                 break;
 350         };
 351
 352 #ifdef CONFIG_DUMMY_CONSOLE
 353         conswitchp = &dummy_con;
 354 #elif defined(CONFIG_PROM_CONSOLE)
 355         conswitchp = &prom_con;
 356 #endif
 357         boot_flags_init(*cmdline_p);
 358
 359         idprom_init();
 360         if (ARCH_SUN4C_SUN4)
 361                 sun4c_probe_vac();
 362         load_mmu();
 363         (void) prom_probe_memory();
 364
 365         phys_base = 0xffffffffUL;
 366         highest_paddr = 0UL;
 367         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 368                 unsigned long top;
 369
 370                 if (sp_banks[i].base_addr < phys_base)
 371                         phys_base = sp_banks[i].base_addr;
 372                 top = sp_banks[i].base_addr +
 373                         sp_banks[i].num_bytes;
 374                 if (highest_paddr < top)
 375                         highest_paddr = top;
 376         }
 377
 378         if (!root_flags)
 379                 root_mountflags &= ~MS_RDONLY;
 380         ROOT_DEV = to_kdev_t(root_dev);
 381 #ifdef CONFIG_BLK_DEV_INITRD
 382         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 383         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 384         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 385 #endif
 386
 387         prom_setsync(prom_sync_me);
 388
 389         {
 390 #if !CONFIG_SUN_SERIAL
 391                 serial_console = 0;
 392 #else
 393                 switch (console_fb) {
 394                 case 0: /* Let get our io devices from prom */
 395                         {
 396                                 int idev = prom_query_input_device();
 397                                 int odev = prom_query_output_device();
 398                                 if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
 399                                         serial_console = 0;
 400                                 } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
 401                                         serial_console = 1;
 402                                 } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
 403                                         serial_console = 2;
 404                                 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
 405                                         prom_printf("MrCoffee ttya\n");
 406                                         serial_console = 1;
 407                                 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
 408                                         serial_console = 0;
 409                                         prom_printf("MrCoffee keyboard\n");
 410                                 } else {
 411                                         prom_printf("Inconsistent or unknown console\n");
 412                                         prom_printf("You cannot mix serial and non serial input/output devices\n");
 413                                         prom_halt();
 414                                 }
 415                         }
 416                         break;
 417                 case 1: serial_console = 0; break; /* Force one of the framebuffers as console */
 418                 case 2: serial_console = 1; break; /* Force ttya as console */
 419                 case 3: serial_console = 2; break; /* Force ttyb as console */
 420                 }
 421 #endif
 422         }
 423
 424         if ((boot_flags & BOOTME_KGDBA)) {
 425                 rs_kgdb_hook(0);
 426         }
 427         if ((boot_flags & BOOTME_KGDBB)) {
 428                 rs_kgdb_hook(1);
 429         }
 430
 431         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 432            ((*(short *)linux_dbvec) != -1)) {
 433                 printk("Booted under KADB. Syncing trap table.\n");
 434                 (*(linux_dbvec->teach_debugger))();
 435         }
 436         if((boot_flags & BOOTME_KGDB)) {
 437                 set_debug_traps();
 438                 prom_printf ("Breakpoint!\n");
 439                 breakpoint();
 440         }
 441
 442         init_mm.context = (unsigned long) NO_CONTEXT;
 443         init_task.thread.kregs = &fake_swapper_regs;
 444
 445         if (serial_console)
 446                 conswitchp = NULL;
 447
 448         paging_init();
 449 }
 450
 451 asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on)
 452 {
 453         return -EIO;
 454 }
 455
 456 extern char *sparc_cpu_type[];
 457 extern char *sparc_fpu_type[];
 458
 459 static int show_cpuinfo(struct seq_file *m, void *__unused)
 460 {
 461         int cpuid = hard_smp_processor_id();
 462
 463         seq_printf(m,
 464                    "cpu\t\t: %s\n"
 465                    "fpu\t\t: %s\n"
 466                    "promlib\t\t: Version %d Revision %d\n"
 467                    "prom\t\t: %d.%d\n"
 468                    "type\t\t: %s\n"
 469                    "ncpus probed\t: %d\n"
 470                    "ncpus active\t: %d\n"
 471 #ifndef CONFIG_SMP
 472                    "BogoMips\t: %lu.%02lu\n"
 473 #endif
 474                    ,
 475                    sparc_cpu_type[cpuid] ? : "undetermined",
 476                    sparc_fpu_type[cpuid] ? : "undetermined",
 477                    romvec->pv_romvers,
 478                    prom_rev,
 479                    romvec->pv_printrev >> 16,
 480                    (short) romvec->pv_printrev,
 481                    &cputypval,
 482                    linux_num_cpus,
 483                    smp_num_cpus
 484 #ifndef CONFIG_SMP
 485                    , loops_per_jiffy/(500000/HZ),
 486                    (loops_per_jiffy/(5000/HZ)) % 100
 487 #endif
 488                 );
 489
 490 #ifdef CONFIG_SMP
 491         smp_bogo_info(m);
 492 #endif
 493         mmu_info(m);
 494 #ifdef CONFIG_SMP
 495         smp_info(m);
 496 #endif
 497         return 0;
 498 }
 499
 500 static void *c_start(struct seq_file *m, loff_t *pos)
 501 {
 502         /* The pointer we are returning is arbitrary,
 503          * it just has to be non-NULL and not IS_ERR
 504          * in the success case.
 505          */
 506         return *pos == 0 ? &c_start : NULL;
 507 }
 508
 509 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 510 {
 511         ++*pos;
 512         return c_start(m, pos);
 513 }
 514
 515 static void c_stop(struct seq_file *m, void *v)
 516 {
 517 }
 518
 519 struct seq_operations cpuinfo_op = {
 520         start:  c_start,
 521         next:   c_next,
 522         stop:   c_stop,
 523         show:   show_cpuinfo,
 524 };