arch/sparc/kernel/setup.c

   1 /*  $Id: setup.c,v 1.110 1999/08/31 06:54:23 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 struct screen_info screen_info = {
  49         0, 0,                   /* orig-x, orig-y */
  50         0,                      /* unused */
  51         0,                      /* orig-video-page */
  52         0,                      /* orig-video-mode */
  53         128,                    /* orig-video-cols */
  54         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  55         54,                     /* orig-video-lines */
  56         0,                      /* orig-video-isVGA */
  57         16                      /* orig-video-points */
  58 };
  59
  60 unsigned int phys_bytes_of_ram, end_of_phys_memory;
  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 extern int serial_console;
  70 extern void breakpoint(void);
  71 #if CONFIG_SUN_CONSOLE
  72 void (*prom_palette)(int);
  73 #endif
  74 asmlinkage void sys_sync(void); /* it's really int */
  75
  76 /* Pretty sick eh? */
  77 void prom_sync_me(void)
  78 {
  79         unsigned long prom_tbr, flags;
  80
  81 #ifdef __SMP__
  82         global_irq_holder = NO_PROC_ID;
  83         *((unsigned char *)&global_irq_lock) = 0;
  84         *((unsigned char *)&global_bh_lock) = 0;
  85 #endif
  86         __save_and_cli(flags);
  87         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
  88         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  89                              "nop\n\t"
  90                              "nop\n\t"
  91                              "nop\n\t" : : "r" (&trapbase));
  92
  93 #ifdef CONFIG_SUN_CONSOLE
  94         if (prom_palette)
  95                 prom_palette(1);
  96 #endif
  97         prom_printf("PROM SYNC COMMAND...\n");
  98         show_free_areas();
  99         if(current->pid != 0) {
 100                 __sti();
 101                 sys_sync();
 102                 __cli();
 103         }
 104         prom_printf("Returning to prom\n");
 105
 106         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
 107                              "nop\n\t"
 108                              "nop\n\t"
 109                              "nop\n\t" : : "r" (prom_tbr));
 110         __restore_flags(flags);
 111
 112         return;
 113 }
 114
 115 extern void rs_kgdb_hook(int tty_num); /* sparc/serial.c */
 116
 117 unsigned int boot_flags;
 118 #define BOOTME_DEBUG  0x1
 119 #define BOOTME_SINGLE 0x2
 120 #define BOOTME_KGDBA  0x4
 121 #define BOOTME_KGDBB  0x8
 122 #define BOOTME_KGDB   0xc
 123
 124 #ifdef CONFIG_SUN_CONSOLE
 125 static int console_fb = 0;
 126 #endif
 127 static unsigned long memory_size __initdata = 0;
 128
 129 void kernel_enter_debugger(void)
 130 {
 131         if (boot_flags & BOOTME_KGDB) {
 132                 printk("KGDB: Entered\n");
 133                 breakpoint();
 134         }
 135 }
 136
 137 int obp_system_intr(void)
 138 {
 139         if (boot_flags & BOOTME_KGDB) {
 140                 printk("KGDB: system interrupted\n");
 141                 breakpoint();
 142                 return 1;
 143         }
 144         if (boot_flags & BOOTME_DEBUG) {
 145                 printk("OBP: system interrupted\n");
 146                 prom_halt();
 147                 return 1;
 148         }
 149         return 0;
 150 }
 151
 152 /*
 153  * Process kernel command line switches that are specific to the
 154  * SPARC or that require special low-level processing.
 155  */
 156 static void __init process_switch(char c)
 157 {
 158         switch (c) {
 159         case 'd':
 160                 boot_flags |= BOOTME_DEBUG;
 161                 break;
 162         case 's':
 163                 boot_flags |= BOOTME_SINGLE;
 164                 break;
 165         case 'h':
 166                 prom_printf("boot_flags_init: Halt!\n");
 167                 halt();
 168                 break;
 169         default:
 170                 printk("Unknown boot switch (-%c)\n", c);
 171                 break;
 172         }
 173 }
 174
 175 static void __init boot_flags_init(char *commands)
 176 {
 177         while (*commands) {
 178                 /* Move to the start of the next "argument". */
 179                 while (*commands && *commands == ' ')
 180                         commands++;
 181
 182                 /* Process any command switches, otherwise skip it. */
 183                 if (*commands == '\0')
 184                         break;
 185                 else if (*commands == '-') {
 186                         commands++;
 187                         while (*commands && *commands != ' ')
 188                                 process_switch(*commands++);
 189                 } else if (strlen(commands) >= 9
 190                            && !strncmp(commands, "kgdb=tty", 8)) {
 191                         switch (commands[8]) {
 192 #ifdef CONFIG_SUN_SERIAL
 193                         case 'a':
 194                                 boot_flags |= BOOTME_KGDBA;
 195                                 prom_printf("KGDB: Using serial line /dev/ttya.\n");
 196                                 break;
 197                         case 'b':
 198                                 boot_flags |= BOOTME_KGDBB;
 199                                 prom_printf("KGDB: Using serial line /dev/ttyb.\n");
 200                                 break;
 201 #endif
 202 #ifdef CONFIG_AP1000
 203                         case 'c':
 204                                 printk("KGDB: AP1000+ debugging\n");
 205                                 break;
 206 #endif
 207                         default:
 208                                 printk("KGDB: Unknown tty line.\n");
 209                                 break;
 210                         }
 211                         commands += 9;
 212                 } else {
 213 #if CONFIG_SUN_CONSOLE
 214                         if (!strncmp(commands, "console=", 8)) {
 215                                 commands += 8;
 216                                 if (!strncmp (commands, "ttya", 4)) {
 217                                         console_fb = 2;
 218                                         prom_printf ("Using /dev/ttya as console.\n");
 219                                 } else if (!strncmp (commands, "ttyb", 4)) {
 220                                         console_fb = 3;
 221                                         prom_printf ("Using /dev/ttyb as console.\n");
 222 #if defined(CONFIG_PROM_CONSOLE)
 223                                 } else if (!strncmp (commands, "prom", 4)) {
 224                                         char *p;
 225
 226                                         for (p = commands - 8; *p && *p != ' '; p++)
 227                                                 *p = ' ';
 228                                         conswitchp = &prom_con;
 229                                         console_fb = 1;
 230 #endif
 231                                 } else {
 232                                         console_fb = 1;
 233                                 }
 234                         } else
 235 #endif
 236                         if (!strncmp(commands, "mem=", 4)) {
 237                                 /*
 238                                  * "mem=XXX[kKmM] overrides the PROM-reported
 239                                  * memory size.
 240                                  */
 241                                 memory_size = simple_strtoul(commands + 4,
 242                                                              &commands, 0);
 243                                 if (*commands == 'K' || *commands == 'k') {
 244                                         memory_size <<= 10;
 245                                         commands++;
 246                                 } else if (*commands=='M' || *commands=='m') {
 247                                         memory_size <<= 20;
 248                                         commands++;
 249                                 }
 250                         }
 251                         while (*commands && *commands != ' ')
 252                                 commands++;
 253                 }
 254         }
 255 }
 256
 257 /* This routine will in the future do all the nasty prom stuff
 258  * to probe for the mmu type and its parameters, etc. This will
 259  * also be where SMP things happen plus the Sparc specific memory
 260  * physical memory probe as on the alpha.
 261  */
 262
 263 extern int prom_probe_memory(void);
 264 extern void sun4c_probe_vac(void);
 265 extern char cputypval;
 266 extern unsigned long start, end;
 267 extern void panic_setup(char *, int *);
 268 extern void srmmu_end_memory(unsigned long, unsigned long *);
 269 extern unsigned long sun_serial_setup(unsigned long);
 270
 271 extern unsigned short root_flags;
 272 extern unsigned short root_dev;
 273 extern unsigned short ram_flags;
 274 extern unsigned sparc_ramdisk_image;
 275 extern unsigned sparc_ramdisk_size;
 276 #define RAMDISK_IMAGE_START_MASK        0x07FF
 277 #define RAMDISK_PROMPT_FLAG             0x8000
 278 #define RAMDISK_LOAD_FLAG               0x4000
 279
 280 extern int root_mountflags;
 281
 282 char saved_command_line[256];
 283 char reboot_command[256];
 284 enum sparc_cpu sparc_cpu_model;
 285
 286 struct tt_entry *sparc_ttable;
 287
 288 struct pt_regs fake_swapper_regs = { 0, 0, 0, 0, { 0, } };
 289
 290 static void prom_cons_write(struct console *con, const char *str, unsigned count)
 291 {
 292         while (count--)
 293                 prom_printf("%c", *str++);
 294 }
 295
 296 static struct console prom_console = {
 297         "PROM", prom_cons_write, 0, 0, 0, 0, 0, CON_PRINTBUFFER, 0, 0, 0
 298 };
 299
 300 void __init setup_arch(char **cmdline_p,
 301         unsigned long * memory_start_p, unsigned long * memory_end_p)
 302 {
 303         int total, i, packed;
 304
 305         sparc_ttable = (struct tt_entry *) &start;
 306
 307         /* Initialize PROM console and command line. */
 308         *cmdline_p = prom_getbootargs();
 309         strcpy(saved_command_line, *cmdline_p);
 310
 311         /* Set sparc_cpu_model */
 312         sparc_cpu_model = sun_unknown;
 313         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
 314         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
 315         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
 316         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
 317         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
 318         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
 319         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
 320
 321 #ifdef CONFIG_SUN4
 322         if (sparc_cpu_model != sun4) {
 323                 prom_printf("This kernel is for Sun4 architecture only.\n");
 324                 prom_halt();
 325         }
 326 #endif
 327 #if CONFIG_AP1000
 328         sparc_cpu_model=ap1000;
 329         strcpy(&cputypval, "ap+");
 330 #endif
 331         printk("ARCH: ");
 332         packed = 0;
 333         switch(sparc_cpu_model) {
 334         case sun4:
 335                 printk("SUN4\n");
 336                 packed = 0;
 337                 break;
 338         case sun4c:
 339                 printk("SUN4C\n");
 340                 packed = 0;
 341                 break;
 342         case sun4m:
 343                 printk("SUN4M\n");
 344                 packed = 1;
 345                 break;
 346         case sun4d:
 347                 printk("SUN4D\n");
 348                 packed = 1;
 349                 break;
 350         case sun4e:
 351                 printk("SUN4E\n");
 352                 packed = 0;
 353                 break;
 354         case sun4u:
 355                 printk("SUN4U\n");
 356                 break;
 357         case ap1000:
 358                 register_console(&prom_console);
 359                 printk("AP1000\n");
 360                 packed = 1;
 361                 break;
 362         default:
 363                 printk("UNKNOWN!\n");
 364                 break;
 365         };
 366
 367 #ifdef CONFIG_DUMMY_CONSOLE
 368         conswitchp = &dummy_con;
 369 #elif defined(CONFIG_PROM_CONSOLE)
 370         conswitchp = &prom_con;
 371 #endif
 372         boot_flags_init(*cmdline_p);
 373
 374         idprom_init();
 375         if (ARCH_SUN4C_SUN4)
 376                 sun4c_probe_vac();
 377         load_mmu();
 378         total = prom_probe_memory();
 379         *memory_start_p = PAGE_ALIGN(((unsigned long) &end));
 380
 381         if(!packed) {
 382                 for(i=0; sp_banks[i].num_bytes != 0; i++) {
 383                         end_of_phys_memory = sp_banks[i].base_addr +
 384                                              sp_banks[i].num_bytes;
 385                         if (memory_size) {
 386                                 if (end_of_phys_memory > memory_size) {
 387                                         sp_banks[i].num_bytes -=
 388                                             (end_of_phys_memory - memory_size);
 389                                         end_of_phys_memory = memory_size;
 390                                         sp_banks[++i].base_addr = 0xdeadbeef;
 391                                         sp_banks[i].num_bytes = 0;
 392                                 }
 393                         }
 394                 }
 395                 *memory_end_p = (end_of_phys_memory + KERNBASE);
 396         } else
 397                 srmmu_end_memory(memory_size, memory_end_p);
 398
 399         if (!root_flags)
 400                 root_mountflags &= ~MS_RDONLY;
 401         ROOT_DEV = to_kdev_t(root_dev);
 402 #ifdef CONFIG_BLK_DEV_RAM
 403         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 404         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 405         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 406 #endif
 407 #ifdef CONFIG_BLK_DEV_INITRD
 408         if (sparc_ramdisk_image) {
 409                 initrd_start = sparc_ramdisk_image;
 410                 if (initrd_start < KERNBASE) initrd_start += KERNBASE;
 411                 initrd_end = initrd_start + sparc_ramdisk_size;
 412                 if (initrd_end > *memory_end_p) {
 413                         printk(KERN_CRIT "initrd extends beyond end of memory "
 414                                          "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 415                                          initrd_end,*memory_end_p);
 416                         initrd_start = 0;
 417                 }
 418                 if (initrd_start >= *memory_start_p && initrd_start < *memory_start_p + 2 * PAGE_SIZE) {
 419                         initrd_below_start_ok = 1;
 420                         *memory_start_p = PAGE_ALIGN (initrd_end);
 421                 } else if (initrd_start && sparc_ramdisk_image < KERNBASE) {
 422                         switch (sparc_cpu_model) {
 423                         case sun4m:
 424                         case sun4d:
 425                                 initrd_start -= KERNBASE;
 426                                 initrd_end -= KERNBASE;
 427                                 break;
 428                         default:
 429                                 break;
 430                         }
 431                 }
 432         }
 433 #endif
 434         prom_setsync(prom_sync_me);
 435
 436 #ifdef CONFIG_SUN_SERIAL
 437         *memory_start_p = sun_serial_setup(*memory_start_p); /* set this up ASAP */
 438 #endif
 439         {
 440 #if !CONFIG_SUN_SERIAL
 441                 serial_console = 0;
 442 #else
 443                 switch (console_fb) {
 444                 case 0: /* Let get our io devices from prom */
 445                         {
 446                                 int idev = prom_query_input_device();
 447                                 int odev = prom_query_output_device();
 448                                 if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
 449                                         serial_console = 0;
 450                                 } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
 451                                         serial_console = 1;
 452                                 } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
 453                                         serial_console = 2;
 454                                 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
 455                                         prom_printf("MrCoffee ttya\n");
 456                                         serial_console = 1;
 457                                 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
 458                                         serial_console = 0;
 459                                         prom_printf("MrCoffee keyboard\n");
 460                                 } else {
 461                                         prom_printf("Inconsistent or unknown console\n");
 462                                         prom_printf("You cannot mix serial and non serial input/output devices\n");
 463                                         prom_halt();
 464                                 }
 465                         }
 466                         break;
 467                 case 1: serial_console = 0; break; /* Force one of the framebuffers as console */
 468                 case 2: serial_console = 1; break; /* Force ttya as console */
 469                 case 3: serial_console = 2; break; /* Force ttyb as console */
 470                 }
 471 #endif
 472         }
 473
 474         if ((boot_flags & BOOTME_KGDBA)) {
 475                 rs_kgdb_hook(0);
 476         }
 477         if ((boot_flags & BOOTME_KGDBB)) {
 478                 rs_kgdb_hook(1);
 479         }
 480
 481         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 482            ((*(short *)linux_dbvec) != -1)) {
 483                 printk("Booted under KADB. Syncing trap table.\n");
 484                 (*(linux_dbvec->teach_debugger))();
 485         }
 486         if((boot_flags & BOOTME_KGDB)) {
 487                 set_debug_traps();
 488                 prom_printf ("Breakpoint!\n");
 489                 breakpoint();
 490         }
 491
 492
 493         /* Due to stack alignment restrictions and assumptions... */
 494         init_mm.mmap->vm_page_prot = PAGE_SHARED;
 495         init_mm.mmap->vm_start = KERNBASE;
 496         init_mm.mmap->vm_end = *memory_end_p;
 497         init_mm.context = (unsigned long) NO_CONTEXT;
 498         init_task.thread.kregs = &fake_swapper_regs;
 499
 500         if (serial_console)
 501                 conswitchp = NULL;
 502 }
 503
 504 asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on)
 505 {
 506         return -EIO;
 507 }
 508
 509 /* BUFFER is PAGE_SIZE bytes long. */
 510
 511 extern char *sparc_cpu_type[];
 512 extern char *sparc_fpu_type[];
 513
 514 int get_cpuinfo(char *buffer)
 515 {
 516         int cpuid=hard_smp_processor_id();
 517         int len;
 518
 519         len = sprintf(buffer, "cpu\t\t: %s\n"
 520             "fpu\t\t: %s\n"
 521             "promlib\t\t: Version %d Revision %d\n"
 522             "prom\t\t: %d.%d\n"
 523             "type\t\t: %s\n"
 524             "ncpus probed\t: %d\n"
 525             "ncpus active\t: %d\n"
 526 #ifndef __SMP__
 527             "BogoMips\t: %lu.%02lu\n"
 528 #endif
 529             ,
 530             sparc_cpu_type[cpuid] ? : "undetermined",
 531             sparc_fpu_type[cpuid] ? : "undetermined",
 532             romvec->pv_romvers, prom_rev, romvec->pv_printrev >> 16, (short)romvec->pv_printrev,
 533             &cputypval,
 534             linux_num_cpus, smp_num_cpus
 535 #ifndef __SMP__
 536             , loops_per_sec/500000, (loops_per_sec/5000) % 100
 537 #endif
 538             );
 539 #ifdef __SMP__
 540         len += smp_bogo_info(buffer + len);
 541 #endif
 542         len += mmu_info(buffer + len);
 543 #ifdef __SMP__
 544         len += smp_info(buffer + len);
 545 #endif
 546         return len;
 547 }