arch/sparc/kernel/setup.c

   1 /*  $Id: setup.c,v 1.120 2000/10/14 10:09:00 davem Exp $
   2  *  linux/arch/sparc/kernel/setup.c
   3  *
   4  *  Copyright (C) 1995  David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #include <linux/errno.h>
   8 #include <linux/sched.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mm.h>
  11 #include <linux/stddef.h>
  12 #include <linux/unistd.h>
  13 #include <linux/ptrace.h>
  14 #include <linux/malloc.h>
  15 #include <asm/smp.h>
  16 #include <linux/user.h>
  17 #include <linux/a.out.h>
  18 #include <linux/tty.h>
  19 #include <linux/delay.h>
  20 #include <linux/config.h>
  21 #include <linux/fs.h>
  22 #include <linux/kdev_t.h>
  23 #include <linux/major.h>
  24 #include <linux/string.h>
  25 #include <linux/blk.h>
  26 #include <linux/init.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/console.h>
  29 #include <linux/spinlock.h>
  30
  31 #include <asm/segment.h>
  32 #include <asm/system.h>
  33 #include <asm/io.h>
  34 #include <asm/kgdb.h>
  35 #include <asm/processor.h>
  36 #include <asm/oplib.h>
  37 #include <asm/page.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/traps.h>
  40 #include <asm/vaddrs.h>
  41 #include <asm/kdebug.h>
  42 #include <asm/mbus.h>
  43 #include <asm/idprom.h>
  44 #include <asm/softirq.h>
  45 #include <asm/hardirq.h>
  46 #include <asm/machines.h>
  47
  48 #undef PROM_DEBUG_CONSOLE
  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 unsigned int phys_bytes_of_ram, end_of_phys_memory;
  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 extern int serial_console;
  72 extern void breakpoint(void);
  73 #if CONFIG_SUN_CONSOLE
  74 void (*prom_palette)(int);
  75 #endif
  76 asmlinkage void sys_sync(void); /* it's really int */
  77
  78 /* Pretty sick eh? */
  79 void prom_sync_me(void)
  80 {
  81         unsigned long prom_tbr, flags;
  82
  83         save_and_cli(flags);
  84         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
  85         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  86                              "nop\n\t"
  87                              "nop\n\t"
  88                              "nop\n\t" : : "r" (&trapbase));
  89
  90 #ifdef CONFIG_SUN_CONSOLE
  91         if (prom_palette)
  92                 prom_palette(1);
  93 #endif
  94         prom_printf("PROM SYNC COMMAND...\n");
  95         show_free_areas();
  96         if(current->pid != 0) {
  97                 sti();
  98                 sys_sync();
  99                 cli();
 100         }
 101         prom_printf("Returning to prom\n");
 102
 103         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
 104                              "nop\n\t"
 105                              "nop\n\t"
 106                              "nop\n\t" : : "r" (prom_tbr));
 107         restore_flags(flags);
 108
 109         return;
 110 }
 111
 112 extern void rs_kgdb_hook(int tty_num); /* sparc/serial.c */
 113
 114 unsigned int boot_flags;
 115 #define BOOTME_DEBUG  0x1
 116 #define BOOTME_SINGLE 0x2
 117 #define BOOTME_KGDBA  0x4
 118 #define BOOTME_KGDBB  0x8
 119 #define BOOTME_KGDB   0xc
 120
 121 #ifdef CONFIG_SUN_CONSOLE
 122 static int console_fb = 0;
 123 #endif
 124
 125 /* Exported for mm/init.c:paging_init. */
 126 unsigned long cmdline_memory_size __initdata = 0;
 127
 128 void kernel_enter_debugger(void)
 129 {
 130         if (boot_flags & BOOTME_KGDB) {
 131                 printk("KGDB: Entered\n");
 132                 breakpoint();
 133         }
 134 }
 135
 136 int obp_system_intr(void)
 137 {
 138         if (boot_flags & BOOTME_KGDB) {
 139                 printk("KGDB: system interrupted\n");
 140                 breakpoint();
 141                 return 1;
 142         }
 143         if (boot_flags & BOOTME_DEBUG) {
 144                 printk("OBP: system interrupted\n");
 145                 prom_halt();
 146                 return 1;
 147         }
 148         return 0;
 149 }
 150
 151 /*
 152  * Process kernel command line switches that are specific to the
 153  * SPARC or that require special low-level processing.
 154  */
 155 static void __init process_switch(char c)
 156 {
 157         switch (c) {
 158         case 'd':
 159                 boot_flags |= BOOTME_DEBUG;
 160                 break;
 161         case 's':
 162                 boot_flags |= BOOTME_SINGLE;
 163                 break;
 164         case 'h':
 165                 prom_printf("boot_flags_init: Halt!\n");
 166                 halt();
 167                 break;
 168         default:
 169                 printk("Unknown boot switch (-%c)\n", c);
 170                 break;
 171         }
 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                 else if (*commands == '-') {
 185                         commands++;
 186                         while (*commands && *commands != ' ')
 187                                 process_switch(*commands++);
 188                 } else if (strlen(commands) >= 9
 189                            && !strncmp(commands, "kgdb=tty", 8)) {
 190                         switch (commands[8]) {
 191 #ifdef CONFIG_SUN_SERIAL
 192                         case 'a':
 193                                 boot_flags |= BOOTME_KGDBA;
 194                                 prom_printf("KGDB: Using serial line /dev/ttya.\n");
 195                                 break;
 196                         case 'b':
 197                                 boot_flags |= BOOTME_KGDBB;
 198                                 prom_printf("KGDB: Using serial line /dev/ttyb.\n");
 199                                 break;
 200 #endif
 201                         default:
 202                                 printk("KGDB: Unknown tty line.\n");
 203                                 break;
 204                         }
 205                         commands += 9;
 206                 } else {
 207 #if CONFIG_SUN_CONSOLE
 208                         if (!strncmp(commands, "console=", 8)) {
 209                                 commands += 8;
 210                                 if (!strncmp (commands, "ttya", 4)) {
 211                                         console_fb = 2;
 212                                         prom_printf ("Using /dev/ttya as console.\n");
 213                                 } else if (!strncmp (commands, "ttyb", 4)) {
 214                                         console_fb = 3;
 215                                         prom_printf ("Using /dev/ttyb as console.\n");
 216 #if defined(CONFIG_PROM_CONSOLE)
 217                                 } else if (!strncmp (commands, "prom", 4)) {
 218                                         char *p;
 219
 220                                         for (p = commands - 8; *p && *p != ' '; p++)
 221                                                 *p = ' ';
 222                                         conswitchp = &prom_con;
 223                                         console_fb = 1;
 224 #endif
 225                                 } else {
 226                                         console_fb = 1;
 227                                 }
 228                         } else
 229 #endif
 230                         if (!strncmp(commands, "mem=", 4)) {
 231                                 /*
 232                                  * "mem=XXX[kKmM] overrides the PROM-reported
 233                                  * memory size.
 234                                  */
 235                                 cmdline_memory_size = simple_strtoul(commands + 4,
 236                                                              &commands, 0);
 237                                 if (*commands == 'K' || *commands == 'k') {
 238                                         cmdline_memory_size <<= 10;
 239                                         commands++;
 240                                 } else if (*commands=='M' || *commands=='m') {
 241                                         cmdline_memory_size <<= 20;
 242                                         commands++;
 243                                 }
 244                         }
 245                         while (*commands && *commands != ' ')
 246                                 commands++;
 247                 }
 248         }
 249 }
 250
 251 /* This routine will in the future do all the nasty prom stuff
 252  * to probe for the mmu type and its parameters, etc. This will
 253  * also be where SMP things happen plus the Sparc specific memory
 254  * physical memory probe as on the alpha.
 255  */
 256
 257 extern int prom_probe_memory(void);
 258 extern void sun4c_probe_vac(void);
 259 extern char cputypval;
 260 extern unsigned long start, end;
 261 extern void panic_setup(char *, int *);
 262 extern void srmmu_end_memory(unsigned long, unsigned long *);
 263 extern void sun_serial_setup(void);
 264
 265 extern unsigned short root_flags;
 266 extern unsigned short root_dev;
 267 extern unsigned short ram_flags;
 268 #define RAMDISK_IMAGE_START_MASK        0x07FF
 269 #define RAMDISK_PROMPT_FLAG             0x8000
 270 #define RAMDISK_LOAD_FLAG               0x4000
 271
 272 extern int root_mountflags;
 273
 274 char saved_command_line[256];
 275 char reboot_command[256];
 276 enum sparc_cpu sparc_cpu_model;
 277
 278 struct tt_entry *sparc_ttable;
 279
 280 struct pt_regs fake_swapper_regs = { 0, 0, 0, 0, { 0, } };
 281
 282 #ifdef PROM_DEBUG_CONSOLE
 283 static void prom_cons_write(struct console *con, const char *str, unsigned count)
 284 {
 285         while (count--)
 286                 prom_printf("%c", *str++);
 287 }
 288
 289 static struct console prom_console = {
 290         name:           "PROM",
 291         write:          prom_cons_write,
 292         flags:          CON_PRINTBUFFER,
 293 };
 294 #endif
 295
 296 extern void paging_init(void);
 297
 298 void __init setup_arch(char **cmdline_p)
 299 {
 300         int i;
 301         unsigned long highest_paddr;
 302
 303         sparc_ttable = (struct tt_entry *) &start;
 304
 305         /* Initialize PROM console and command line. */
 306         *cmdline_p = prom_getbootargs();
 307         strcpy(saved_command_line, *cmdline_p);
 308
 309         /* Set sparc_cpu_model */
 310         sparc_cpu_model = sun_unknown;
 311         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
 312         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
 313         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
 314         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
 315         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
 316         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
 317         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
 318
 319 #ifdef CONFIG_SUN4
 320         if (sparc_cpu_model != sun4) {
 321                 prom_printf("This kernel is for Sun4 architecture only.\n");
 322                 prom_halt();
 323         }
 324 #endif
 325         printk("ARCH: ");
 326         switch(sparc_cpu_model) {
 327         case sun4:
 328                 printk("SUN4\n");
 329                 break;
 330         case sun4c:
 331                 printk("SUN4C\n");
 332                 break;
 333         case sun4m:
 334                 printk("SUN4M\n");
 335                 break;
 336         case sun4d:
 337                 printk("SUN4D\n");
 338                 break;
 339         case sun4e:
 340                 printk("SUN4E\n");
 341                 break;
 342         case sun4u:
 343                 printk("SUN4U\n");
 344                 break;
 345         default:
 346                 printk("UNKNOWN!\n");
 347                 break;
 348         };
 349 #ifdef PROM_DEBUG_CONSOLE
 350         register_console(&prom_console);
 351 #endif
 352
 353 #ifdef CONFIG_DUMMY_CONSOLE
 354         conswitchp = &dummy_con;
 355 #elif defined(CONFIG_PROM_CONSOLE)
 356         conswitchp = &prom_con;
 357 #endif
 358         boot_flags_init(*cmdline_p);
 359
 360         idprom_init();
 361         if (ARCH_SUN4C_SUN4)
 362                 sun4c_probe_vac();
 363         load_mmu();
 364         (void) prom_probe_memory();
 365
 366         phys_base = 0xffffffffUL;
 367         highest_paddr = 0UL;
 368         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 369                 unsigned long top;
 370
 371                 if (sp_banks[i].base_addr < phys_base)
 372                         phys_base = sp_banks[i].base_addr;
 373                 top = sp_banks[i].base_addr +
 374                         sp_banks[i].num_bytes;
 375                 if (highest_paddr < top)
 376                         highest_paddr = top;
 377         }
 378
 379         if (!root_flags)
 380                 root_mountflags &= ~MS_RDONLY;
 381         ROOT_DEV = to_kdev_t(root_dev);
 382 #ifdef CONFIG_BLK_DEV_RAM
 383         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 384         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 385         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 386 #endif
 387
 388         prom_setsync(prom_sync_me);
 389
 390         {
 391 #if !CONFIG_SUN_SERIAL
 392                 serial_console = 0;
 393 #else
 394                 switch (console_fb) {
 395                 case 0: /* Let get our io devices from prom */
 396                         {
 397                                 int idev = prom_query_input_device();
 398                                 int odev = prom_query_output_device();
 399                                 if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
 400                                         serial_console = 0;
 401                                 } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
 402                                         serial_console = 1;
 403                                 } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
 404                                         serial_console = 2;
 405                                 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
 406                                         prom_printf("MrCoffee ttya\n");
 407                                         serial_console = 1;
 408                                 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
 409                                         serial_console = 0;
 410                                         prom_printf("MrCoffee keyboard\n");
 411                                 } else {
 412                                         prom_printf("Inconsistent or unknown console\n");
 413                                         prom_printf("You cannot mix serial and non serial input/output devices\n");
 414                                         prom_halt();
 415                                 }
 416                         }
 417                         break;
 418                 case 1: serial_console = 0; break; /* Force one of the framebuffers as console */
 419                 case 2: serial_console = 1; break; /* Force ttya as console */
 420                 case 3: serial_console = 2; break; /* Force ttyb as console */
 421                 }
 422 #endif
 423         }
 424
 425         if ((boot_flags & BOOTME_KGDBA)) {
 426                 rs_kgdb_hook(0);
 427         }
 428         if ((boot_flags & BOOTME_KGDBB)) {
 429                 rs_kgdb_hook(1);
 430         }
 431
 432         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 433            ((*(short *)linux_dbvec) != -1)) {
 434                 printk("Booted under KADB. Syncing trap table.\n");
 435                 (*(linux_dbvec->teach_debugger))();
 436         }
 437         if((boot_flags & BOOTME_KGDB)) {
 438                 set_debug_traps();
 439                 prom_printf ("Breakpoint!\n");
 440                 breakpoint();
 441         }
 442
 443         /* Due to stack alignment restrictions and assumptions... */
 444         init_mm.mmap->vm_page_prot = PAGE_SHARED;
 445         init_mm.mmap->vm_start = PAGE_OFFSET;
 446         init_mm.mmap->vm_end = PAGE_OFFSET + highest_paddr;
 447         init_mm.context = (unsigned long) NO_CONTEXT;
 448         init_task.thread.kregs = &fake_swapper_regs;
 449
 450         if (serial_console)
 451                 conswitchp = NULL;
 452
 453         paging_init();
 454 }
 455
 456 asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on)
 457 {
 458         return -EIO;
 459 }
 460
 461 /* BUFFER is PAGE_SIZE bytes long. */
 462
 463 extern char *sparc_cpu_type[];
 464 extern char *sparc_fpu_type[];
 465
 466 int get_cpuinfo(char *buffer)
 467 {
 468         int cpuid=hard_smp_processor_id();
 469         int len;
 470
 471         len = sprintf(buffer, "cpu\t\t: %s\n"
 472             "fpu\t\t: %s\n"
 473             "promlib\t\t: Version %d Revision %d\n"
 474             "prom\t\t: %d.%d\n"
 475             "type\t\t: %s\n"
 476             "ncpus probed\t: %d\n"
 477             "ncpus active\t: %d\n"
 478 #ifndef CONFIG_SMP
 479             "BogoMips\t: %lu.%02lu\n"
 480 #endif
 481             ,
 482             sparc_cpu_type[cpuid] ? : "undetermined",
 483             sparc_fpu_type[cpuid] ? : "undetermined",
 484             romvec->pv_romvers, prom_rev, romvec->pv_printrev >> 16, (short)romvec->pv_printrev,
 485             &cputypval,
 486             linux_num_cpus, smp_num_cpus
 487 #ifndef CONFIG_SMP
 488             , loops_per_sec/500000, (loops_per_sec/5000) % 100
 489 #endif
 490             );
 491 #ifdef CONFIG_SMP
 492         len += smp_bogo_info(buffer + len);
 493 #endif
 494         len += mmu_info(buffer + len);
 495 #ifdef CONFIG_SMP
 496         len += smp_info(buffer + len);
 497 #endif
 498         return len;
 499 }