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