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