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/hardirq.h>
  48 #include <asm/machines.h>
  49 #include <asm/cpudata.h>
  50 #include <asm/setup.h>
  51
  52 struct screen_info screen_info = {
  53         0, 0,                   /* orig-x, orig-y */
  54         0,                      /* unused */
  55         0,                      /* orig-video-page */
  56         0,                      /* orig-video-mode */
  57         128,                    /* orig-video-cols */
  58         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  59         54,                     /* orig-video-lines */
  60         0,                      /* orig-video-isVGA */
  61         16                      /* orig-video-points */
  62 };
  63
  64 /* Typing sync at the prom prompt calls the function pointed to by
  65  * romvec->pv_synchook which I set to the following function.
  66  * This should sync all filesystems and return, for now it just
  67  * prints out pretty messages and returns.
  68  */
  69
  70 extern unsigned long trapbase;
  71 void (*prom_palette)(int);
  72
  73 /* Pretty sick eh? */
  74 void prom_sync_me(void)
  75 {
  76         unsigned long prom_tbr, flags;
  77
  78         /* XXX Badly broken. FIX! - Anton */
  79         local_irq_save(flags);
  80         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
  81         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  82                              "nop\n\t"
  83                              "nop\n\t"
  84                              "nop\n\t" : : "r" (&trapbase));
  85
  86         if (prom_palette)
  87                 prom_palette(1);
  88         prom_printf("PROM SYNC COMMAND...\n");
  89         show_free_areas();
  90         if(current->pid != 0) {
  91                 local_irq_enable();
  92                 sys_sync();
  93                 local_irq_disable();
  94         }
  95         prom_printf("Returning to prom\n");
  96
  97         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  98                              "nop\n\t"
  99                              "nop\n\t"
 100                              "nop\n\t" : : "r" (prom_tbr));
 101         local_irq_restore(flags);
 102
 103         return;
 104 }
 105
 106 unsigned int boot_flags __initdata = 0;
 107 #define BOOTME_DEBUG  0x1
 108 #define BOOTME_SINGLE 0x2
 109
 110 /* Exported for mm/init.c:paging_init. */
 111 unsigned long cmdline_memory_size __initdata = 0;
 112
 113 static void
 114 prom_console_write(struct console *con, const char *s, unsigned n)
 115 {
 116         prom_write(s, n);
 117 }
 118
 119 static struct console prom_debug_console = {
 120         .name =         "debug",
 121         .write =        prom_console_write,
 122         .flags =        CON_PRINTBUFFER,
 123         .index =        -1,
 124 };
 125
 126 int obp_system_intr(void)
 127 {
 128         if (boot_flags & BOOTME_DEBUG) {
 129                 printk("OBP: system interrupted\n");
 130                 prom_halt();
 131                 return 1;
 132         }
 133         return 0;
 134 }
 135
 136 /*
 137  * Process kernel command line switches that are specific to the
 138  * SPARC or that require special low-level processing.
 139  */
 140 static void __init process_switch(char c)
 141 {
 142         switch (c) {
 143         case 'd':
 144                 boot_flags |= BOOTME_DEBUG;
 145                 break;
 146         case 's':
 147                 boot_flags |= BOOTME_SINGLE;
 148                 break;
 149         case 'h':
 150                 prom_printf("boot_flags_init: Halt!\n");
 151                 prom_halt();
 152                 break;
 153         case 'p':
 154                 /* Use PROM debug console. */
 155                 register_console(&prom_debug_console);
 156                 break;
 157         default:
 158                 printk("Unknown boot switch (-%c)\n", c);
 159                 break;
 160         }
 161 }
 162
 163 static void __init process_console(char *commands)
 164 {
 165         serial_console = 0;
 166         commands += 8;
 167         /* Linux-style serial */
 168         if (!strncmp(commands, "ttyS", 4))
 169                 serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
 170         else if (!strncmp(commands, "tty", 3)) {
 171                 char c = *(commands + 3);
 172                 /* Solaris-style serial */
 173                 if (c == 'a' || c == 'b')
 174                         serial_console = c - 'a' + 1;
 175                 /* else Linux-style fbcon, not serial */
 176         }
 177 #if defined(CONFIG_PROM_CONSOLE)
 178         if (!strncmp(commands, "prom", 4)) {
 179                 char *p;
 180
 181                 for (p = commands - 8; *p && *p != ' '; p++)
 182                         *p = ' ';
 183                 conswitchp = &prom_con;
 184         }
 185 #endif
 186 }
 187
 188 static void __init boot_flags_init(char *commands)
 189 {
 190         while (*commands) {
 191                 /* Move to the start of the next "argument". */
 192                 while (*commands && *commands == ' ')
 193                         commands++;
 194
 195                 /* Process any command switches, otherwise skip it. */
 196                 if (*commands == '\0')
 197                         break;
 198                 if (*commands == '-') {
 199                         commands++;
 200                         while (*commands && *commands != ' ')
 201                                 process_switch(*commands++);
 202                         continue;
 203                 }
 204                 if (!strncmp(commands, "console=", 8)) {
 205                         process_console(commands);
 206                 } else if (!strncmp(commands, "mem=", 4)) {
 207                         /*
 208                          * "mem=XXX[kKmM] overrides the PROM-reported
 209                          * memory size.
 210                          */
 211                         cmdline_memory_size = simple_strtoul(commands + 4,
 212                                                      &commands, 0);
 213                         if (*commands == 'K' || *commands == 'k') {
 214                                 cmdline_memory_size <<= 10;
 215                                 commands++;
 216                         } else if (*commands=='M' || *commands=='m') {
 217                                 cmdline_memory_size <<= 20;
 218                                 commands++;
 219                         }
 220                 }
 221                 while (*commands && *commands != ' ')
 222                         commands++;
 223         }
 224 }
 225
 226 /* This routine will in the future do all the nasty prom stuff
 227  * to probe for the mmu type and its parameters, etc. This will
 228  * also be where SMP things happen plus the Sparc specific memory
 229  * physical memory probe as on the alpha.
 230  */
 231
 232 extern int prom_probe_memory(void);
 233 extern void sun4c_probe_vac(void);
 234 extern char cputypval;
 235 extern unsigned long start, end;
 236 extern void panic_setup(char *, int *);
 237
 238 extern unsigned short root_flags;
 239 extern unsigned short root_dev;
 240 extern unsigned short ram_flags;
 241 #define RAMDISK_IMAGE_START_MASK        0x07FF
 242 #define RAMDISK_PROMPT_FLAG             0x8000
 243 #define RAMDISK_LOAD_FLAG               0x4000
 244
 245 extern int root_mountflags;
 246
 247 char reboot_command[COMMAND_LINE_SIZE];
 248 enum sparc_cpu sparc_cpu_model;
 249
 250 struct tt_entry *sparc_ttable;
 251
 252 struct pt_regs fake_swapper_regs;
 253
 254 extern void paging_init(void);
 255
 256 void __init setup_arch(char **cmdline_p)
 257 {
 258         int i;
 259         unsigned long highest_paddr;
 260
 261         sparc_ttable = (struct tt_entry *) &start;
 262
 263         /* Initialize PROM console and command line. */
 264         *cmdline_p = prom_getbootargs();
 265         strcpy(saved_command_line, *cmdline_p);
 266
 267         /* Set sparc_cpu_model */
 268         sparc_cpu_model = sun_unknown;
 269         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
 270         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
 271         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
 272         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
 273         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
 274         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
 275         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
 276
 277 #ifdef CONFIG_SUN4
 278         if (sparc_cpu_model != sun4) {
 279                 prom_printf("This kernel is for Sun4 architecture only.\n");
 280                 prom_halt();
 281         }
 282 #endif
 283         printk("ARCH: ");
 284         switch(sparc_cpu_model) {
 285         case sun4:
 286                 printk("SUN4\n");
 287                 break;
 288         case sun4c:
 289                 printk("SUN4C\n");
 290                 break;
 291         case sun4m:
 292                 printk("SUN4M\n");
 293                 break;
 294         case sun4d:
 295                 printk("SUN4D\n");
 296                 break;
 297         case sun4e:
 298                 printk("SUN4E\n");
 299                 break;
 300         case sun4u:
 301                 printk("SUN4U\n");
 302                 break;
 303         default:
 304                 printk("UNKNOWN!\n");
 305                 break;
 306         };
 307
 308 #ifdef CONFIG_DUMMY_CONSOLE
 309         conswitchp = &dummy_con;
 310 #elif defined(CONFIG_PROM_CONSOLE)
 311         conswitchp = &prom_con;
 312 #endif
 313         boot_flags_init(*cmdline_p);
 314
 315         idprom_init();
 316         if (ARCH_SUN4C_SUN4)
 317                 sun4c_probe_vac();
 318         load_mmu();
 319         (void) prom_probe_memory();
 320
 321         phys_base = 0xffffffffUL;
 322         highest_paddr = 0UL;
 323         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 324                 unsigned long top;
 325
 326                 if (sp_banks[i].base_addr < phys_base)
 327                         phys_base = sp_banks[i].base_addr;
 328                 top = sp_banks[i].base_addr +
 329                         sp_banks[i].num_bytes;
 330                 if (highest_paddr < top)
 331                         highest_paddr = top;
 332         }
 333         pfn_base = phys_base >> PAGE_SHIFT;
 334
 335         if (!root_flags)
 336                 root_mountflags &= ~MS_RDONLY;
 337         ROOT_DEV = old_decode_dev(root_dev);
 338 #ifdef CONFIG_BLK_DEV_INITRD
 339         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 340         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 341         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 342 #endif
 343
 344         prom_setsync(prom_sync_me);
 345
 346         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 347            ((*(short *)linux_dbvec) != -1)) {
 348                 printk("Booted under KADB. Syncing trap table.\n");
 349                 (*(linux_dbvec->teach_debugger))();
 350         }
 351
 352         init_mm.context = (unsigned long) NO_CONTEXT;
 353         init_task.thread.kregs = &fake_swapper_regs;
 354
 355         paging_init();
 356 }
 357
 358 static int __init set_preferred_console(void)
 359 {
 360         int idev, odev;
 361
 362         /* The user has requested a console so this is already set up. */
 363         if (serial_console >= 0)
 364                 return -EBUSY;
 365
 366         idev = prom_query_input_device();
 367         odev = prom_query_output_device();
 368         if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
 369                 serial_console = 0;
 370         } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
 371                 serial_console = 1;
 372         } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
 373                 serial_console = 2;
 374         } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
 375                 prom_printf("MrCoffee ttya\n");
 376                 serial_console = 1;
 377         } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
 378                 serial_console = 0;
 379                 prom_printf("MrCoffee keyboard\n");
 380         } else {
 381                 prom_printf("Confusing console (idev %d, odev %d)\n",
 382                     idev, odev);
 383                 serial_console = 1;
 384         }
 385
 386         if (serial_console)
 387                 return add_preferred_console("ttyS", serial_console - 1, NULL);
 388
 389         return -ENODEV;
 390 }
 391 console_initcall(set_preferred_console);
 392
 393 extern char *sparc_cpu_type;
 394 extern char *sparc_fpu_type;
 395
 396 static int show_cpuinfo(struct seq_file *m, void *__unused)
 397 {
 398         seq_printf(m,
 399                    "cpu\t\t: %s\n"
 400                    "fpu\t\t: %s\n"
 401                    "promlib\t\t: Version %d Revision %d\n"
 402                    "prom\t\t: %d.%d\n"
 403                    "type\t\t: %s\n"
 404                    "ncpus probed\t: %d\n"
 405                    "ncpus active\t: %d\n"
 406 #ifndef CONFIG_SMP
 407                    "CPU0Bogo\t: %lu.%02lu\n"
 408                    "CPU0ClkTck\t: %ld\n"
 409 #endif
 410                    ,
 411                    sparc_cpu_type ? sparc_cpu_type : "undetermined",
 412                    sparc_fpu_type ? sparc_fpu_type : "undetermined",
 413                    romvec->pv_romvers,
 414                    prom_rev,
 415                    romvec->pv_printrev >> 16,
 416                    romvec->pv_printrev & 0xffff,
 417                    &cputypval,
 418                    num_possible_cpus(),
 419                    num_online_cpus()
 420 #ifndef CONFIG_SMP
 421                    , cpu_data(0).udelay_val/(500000/HZ),
 422                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 423                    cpu_data(0).clock_tick
 424 #endif
 425                 );
 426
 427 #ifdef CONFIG_SMP
 428         smp_bogo(m);
 429 #endif
 430         mmu_info(m);
 431 #ifdef CONFIG_SMP
 432         smp_info(m);
 433 #endif
 434         return 0;
 435 }
 436
 437 static void *c_start(struct seq_file *m, loff_t *pos)
 438 {
 439         /* The pointer we are returning is arbitrary,
 440          * it just has to be non-NULL and not IS_ERR
 441          * in the success case.
 442          */
 443         return *pos == 0 ? &c_start : NULL;
 444 }
 445
 446 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 447 {
 448         ++*pos;
 449         return c_start(m, pos);
 450 }
 451
 452 static void c_stop(struct seq_file *m, void *v)
 453 {
 454 }
 455
 456 struct seq_operations cpuinfo_op = {
 457         .start =c_start,
 458         .next = c_next,
 459         .stop = c_stop,
 460         .show = show_cpuinfo,
 461 };
 462
 463 extern int stop_a_enabled;
 464
 465 void sun_do_break(void)
 466 {
 467         if (!stop_a_enabled)
 468                 return;
 469
 470         printk("\n");
 471         flush_user_windows();
 472
 473         prom_cmdline();
 474 }
 475
 476 int serial_console = -1;
 477 int stop_a_enabled = 1;