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/tty.h>
  21 #include <linux/delay.h>
  22 #include <linux/config.h>
  23 #include <linux/fs.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/syscalls.h>
  26 #include <linux/kdev_t.h>
  27 #include <linux/major.h>
  28 #include <linux/string.h>
  29 #include <linux/init.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/console.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/root_dev.h>
  34
  35 #include <asm/segment.h>
  36 #include <asm/system.h>
  37 #include <asm/io.h>
  38 #include <asm/processor.h>
  39 #include <asm/oplib.h>
  40 #include <asm/page.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/traps.h>
  43 #include <asm/vaddrs.h>
  44 #include <asm/kdebug.h>
  45 #include <asm/mbus.h>
  46 #include <asm/idprom.h>
  47 #include <asm/machines.h>
  48 #include <asm/cpudata.h>
  49 #include <asm/setup.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 void (*prom_palette)(int);
  71
  72 /* Pretty sick eh? */
  73 void prom_sync_me(void)
  74 {
  75         unsigned long prom_tbr, flags;
  76
  77         /* XXX Badly broken. FIX! - Anton */
  78         local_irq_save(flags);
  79         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
  80         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  81                              "nop\n\t"
  82                              "nop\n\t"
  83                              "nop\n\t" : : "r" (&trapbase));
  84
  85         if (prom_palette)
  86                 prom_palette(1);
  87         prom_printf("PROM SYNC COMMAND...\n");
  88         show_free_areas();
  89         if(current->pid != 0) {
  90                 local_irq_enable();
  91                 sys_sync();
  92                 local_irq_disable();
  93         }
  94         prom_printf("Returning to prom\n");
  95
  96         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  97                              "nop\n\t"
  98                              "nop\n\t"
  99                              "nop\n\t" : : "r" (prom_tbr));
 100         local_irq_restore(flags);
 101
 102         return;
 103 }
 104
 105 unsigned int boot_flags __initdata = 0;
 106 #define BOOTME_DEBUG  0x1
 107 #define BOOTME_SINGLE 0x2
 108
 109 /* Exported for mm/init.c:paging_init. */
 110 unsigned long cmdline_memory_size __initdata = 0;
 111
 112 static void
 113 prom_console_write(struct console *con, const char *s, unsigned n)
 114 {
 115         prom_write(s, n);
 116 }
 117
 118 static struct console prom_debug_console = {
 119         .name =         "debug",
 120         .write =        prom_console_write,
 121         .flags =        CON_PRINTBUFFER,
 122         .index =        -1,
 123 };
 124
 125 int obp_system_intr(void)
 126 {
 127         if (boot_flags & BOOTME_DEBUG) {
 128                 printk("OBP: system interrupted\n");
 129                 prom_halt();
 130                 return 1;
 131         }
 132         return 0;
 133 }
 134
 135 /*
 136  * Process kernel command line switches that are specific to the
 137  * SPARC or that require special low-level processing.
 138  */
 139 static void __init process_switch(char c)
 140 {
 141         switch (c) {
 142         case 'd':
 143                 boot_flags |= BOOTME_DEBUG;
 144                 break;
 145         case 's':
 146                 boot_flags |= BOOTME_SINGLE;
 147                 break;
 148         case 'h':
 149                 prom_printf("boot_flags_init: Halt!\n");
 150                 prom_halt();
 151                 break;
 152         case 'p':
 153                 /* Use PROM debug console. */
 154                 register_console(&prom_debug_console);
 155                 break;
 156         default:
 157                 printk("Unknown boot switch (-%c)\n", c);
 158                 break;
 159         }
 160 }
 161
 162 static void __init process_console(char *commands)
 163 {
 164         serial_console = 0;
 165         commands += 8;
 166         /* Linux-style serial */
 167         if (!strncmp(commands, "ttyS", 4))
 168                 serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
 169         else if (!strncmp(commands, "tty", 3)) {
 170                 char c = *(commands + 3);
 171                 /* Solaris-style serial */
 172                 if (c == 'a' || c == 'b')
 173                         serial_console = c - 'a' + 1;
 174                 /* else Linux-style fbcon, not serial */
 175         }
 176 #if defined(CONFIG_PROM_CONSOLE)
 177         if (!strncmp(commands, "prom", 4)) {
 178                 char *p;
 179
 180                 for (p = commands - 8; *p && *p != ' '; p++)
 181                         *p = ' ';
 182                 conswitchp = &prom_con;
 183         }
 184 #endif
 185 }
 186
 187 static void __init boot_flags_init(char *commands)
 188 {
 189         while (*commands) {
 190                 /* Move to the start of the next "argument". */
 191                 while (*commands && *commands == ' ')
 192                         commands++;
 193
 194                 /* Process any command switches, otherwise skip it. */
 195                 if (*commands == '\0')
 196                         break;
 197                 if (*commands == '-') {
 198                         commands++;
 199                         while (*commands && *commands != ' ')
 200                                 process_switch(*commands++);
 201                         continue;
 202                 }
 203                 if (!strncmp(commands, "console=", 8)) {
 204                         process_console(commands);
 205                 } else if (!strncmp(commands, "mem=", 4)) {
 206                         /*
 207                          * "mem=XXX[kKmM] overrides the PROM-reported
 208                          * memory size.
 209                          */
 210                         cmdline_memory_size = simple_strtoul(commands + 4,
 211                                                      &commands, 0);
 212                         if (*commands == 'K' || *commands == 'k') {
 213                                 cmdline_memory_size <<= 10;
 214                                 commands++;
 215                         } else if (*commands=='M' || *commands=='m') {
 216                                 cmdline_memory_size <<= 20;
 217                                 commands++;
 218                         }
 219                 }
 220                 while (*commands && *commands != ' ')
 221                         commands++;
 222         }
 223 }
 224
 225 /* This routine will in the future do all the nasty prom stuff
 226  * to probe for the mmu type and its parameters, etc. This will
 227  * also be where SMP things happen plus the Sparc specific memory
 228  * physical memory probe as on the alpha.
 229  */
 230
 231 extern int prom_probe_memory(void);
 232 extern void sun4c_probe_vac(void);
 233 extern char cputypval;
 234 extern unsigned long start, end;
 235 extern void panic_setup(char *, int *);
 236
 237 extern unsigned short root_flags;
 238 extern unsigned short root_dev;
 239 extern unsigned short ram_flags;
 240 #define RAMDISK_IMAGE_START_MASK        0x07FF
 241 #define RAMDISK_PROMPT_FLAG             0x8000
 242 #define RAMDISK_LOAD_FLAG               0x4000
 243
 244 extern int root_mountflags;
 245
 246 char reboot_command[COMMAND_LINE_SIZE];
 247 enum sparc_cpu sparc_cpu_model;
 248
 249 struct tt_entry *sparc_ttable;
 250
 251 struct pt_regs fake_swapper_regs;
 252
 253 extern void paging_init(void);
 254
 255 void __init setup_arch(char **cmdline_p)
 256 {
 257         int i;
 258         unsigned long highest_paddr;
 259
 260         sparc_ttable = (struct tt_entry *) &start;
 261
 262         /* Initialize PROM console and command line. */
 263         *cmdline_p = prom_getbootargs();
 264         strcpy(saved_command_line, *cmdline_p);
 265
 266         /* Set sparc_cpu_model */
 267         sparc_cpu_model = sun_unknown;
 268         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
 269         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
 270         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
 271         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
 272         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
 273         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
 274         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
 275
 276 #ifdef CONFIG_SUN4
 277         if (sparc_cpu_model != sun4) {
 278                 prom_printf("This kernel is for Sun4 architecture only.\n");
 279                 prom_halt();
 280         }
 281 #endif
 282         printk("ARCH: ");
 283         switch(sparc_cpu_model) {
 284         case sun4:
 285                 printk("SUN4\n");
 286                 break;
 287         case sun4c:
 288                 printk("SUN4C\n");
 289                 break;
 290         case sun4m:
 291                 printk("SUN4M\n");
 292                 break;
 293         case sun4d:
 294                 printk("SUN4D\n");
 295                 break;
 296         case sun4e:
 297                 printk("SUN4E\n");
 298                 break;
 299         case sun4u:
 300                 printk("SUN4U\n");
 301                 break;
 302         default:
 303                 printk("UNKNOWN!\n");
 304                 break;
 305         };
 306
 307 #ifdef CONFIG_DUMMY_CONSOLE
 308         conswitchp = &dummy_con;
 309 #elif defined(CONFIG_PROM_CONSOLE)
 310         conswitchp = &prom_con;
 311 #endif
 312         boot_flags_init(*cmdline_p);
 313
 314         idprom_init();
 315         if (ARCH_SUN4C_SUN4)
 316                 sun4c_probe_vac();
 317         load_mmu();
 318         (void) prom_probe_memory();
 319
 320         phys_base = 0xffffffffUL;
 321         highest_paddr = 0UL;
 322         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 323                 unsigned long top;
 324
 325                 if (sp_banks[i].base_addr < phys_base)
 326                         phys_base = sp_banks[i].base_addr;
 327                 top = sp_banks[i].base_addr +
 328                         sp_banks[i].num_bytes;
 329                 if (highest_paddr < top)
 330                         highest_paddr = top;
 331         }
 332         pfn_base = phys_base >> PAGE_SHIFT;
 333
 334         if (!root_flags)
 335                 root_mountflags &= ~MS_RDONLY;
 336         ROOT_DEV = old_decode_dev(root_dev);
 337 #ifdef CONFIG_BLK_DEV_INITRD
 338         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 339         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 340         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 341 #endif
 342
 343         prom_setsync(prom_sync_me);
 344
 345         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 346            ((*(short *)linux_dbvec) != -1)) {
 347                 printk("Booted under KADB. Syncing trap table.\n");
 348                 (*(linux_dbvec->teach_debugger))();
 349         }
 350
 351         init_mm.context = (unsigned long) NO_CONTEXT;
 352         init_task.thread.kregs = &fake_swapper_regs;
 353
 354         paging_init();
 355 }
 356
 357 static int __init set_preferred_console(void)
 358 {
 359         int idev, odev;
 360
 361         /* The user has requested a console so this is already set up. */
 362         if (serial_console >= 0)
 363                 return -EBUSY;
 364
 365         idev = prom_query_input_device();
 366         odev = prom_query_output_device();
 367         if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
 368                 serial_console = 0;
 369         } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
 370                 serial_console = 1;
 371         } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
 372                 serial_console = 2;
 373         } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
 374                 prom_printf("MrCoffee ttya\n");
 375                 serial_console = 1;
 376         } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
 377                 serial_console = 0;
 378                 prom_printf("MrCoffee keyboard\n");
 379         } else {
 380                 prom_printf("Confusing console (idev %d, odev %d)\n",
 381                     idev, odev);
 382                 serial_console = 1;
 383         }
 384
 385         if (serial_console)
 386                 return add_preferred_console("ttyS", serial_console - 1, NULL);
 387
 388         return -ENODEV;
 389 }
 390 console_initcall(set_preferred_console);
 391
 392 extern char *sparc_cpu_type;
 393 extern char *sparc_fpu_type;
 394
 395 static int show_cpuinfo(struct seq_file *m, void *__unused)
 396 {
 397         seq_printf(m,
 398                    "cpu\t\t: %s\n"
 399                    "fpu\t\t: %s\n"
 400                    "promlib\t\t: Version %d Revision %d\n"
 401                    "prom\t\t: %d.%d\n"
 402                    "type\t\t: %s\n"
 403                    "ncpus probed\t: %d\n"
 404                    "ncpus active\t: %d\n"
 405 #ifndef CONFIG_SMP
 406                    "CPU0Bogo\t: %lu.%02lu\n"
 407                    "CPU0ClkTck\t: %ld\n"
 408 #endif
 409                    ,
 410                    sparc_cpu_type ? sparc_cpu_type : "undetermined",
 411                    sparc_fpu_type ? sparc_fpu_type : "undetermined",
 412                    romvec->pv_romvers,
 413                    prom_rev,
 414                    romvec->pv_printrev >> 16,
 415                    romvec->pv_printrev & 0xffff,
 416                    &cputypval,
 417                    num_possible_cpus(),
 418                    num_online_cpus()
 419 #ifndef CONFIG_SMP
 420                    , cpu_data(0).udelay_val/(500000/HZ),
 421                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 422                    cpu_data(0).clock_tick
 423 #endif
 424                 );
 425
 426 #ifdef CONFIG_SMP
 427         smp_bogo(m);
 428 #endif
 429         mmu_info(m);
 430 #ifdef CONFIG_SMP
 431         smp_info(m);
 432 #endif
 433         return 0;
 434 }
 435
 436 static void *c_start(struct seq_file *m, loff_t *pos)
 437 {
 438         /* The pointer we are returning is arbitrary,
 439          * it just has to be non-NULL and not IS_ERR
 440          * in the success case.
 441          */
 442         return *pos == 0 ? &c_start : NULL;
 443 }
 444
 445 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 446 {
 447         ++*pos;
 448         return c_start(m, pos);
 449 }
 450
 451 static void c_stop(struct seq_file *m, void *v)
 452 {
 453 }
 454
 455 struct seq_operations cpuinfo_op = {
 456         .start =c_start,
 457         .next = c_next,
 458         .stop = c_stop,
 459         .show = show_cpuinfo,
 460 };
 461
 462 extern int stop_a_enabled;
 463
 464 void sun_do_break(void)
 465 {
 466         if (!stop_a_enabled)
 467                 return;
 468
 469         printk("\n");
 470         flush_user_windows();
 471
 472         prom_cmdline();
 473 }
 474
 475 int serial_console = -1;
 476 int stop_a_enabled = 1;