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 #include <linux/kdebug.h>
  35
  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/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 boot_flags_init(char *commands)
 150 {
 151         while (*commands) {
 152                 /* Move to the start of the next "argument". */
 153                 while (*commands && *commands == ' ')
 154                         commands++;
 155
 156                 /* Process any command switches, otherwise skip it. */
 157                 if (*commands == '\0')
 158                         break;
 159                 if (*commands == '-') {
 160                         commands++;
 161                         while (*commands && *commands != ' ')
 162                                 process_switch(*commands++);
 163                         continue;
 164                 }
 165                 if (!strncmp(commands, "mem=", 4)) {
 166                         /*
 167                          * "mem=XXX[kKmM] overrides the PROM-reported
 168                          * memory size.
 169                          */
 170                         cmdline_memory_size = simple_strtoul(commands + 4,
 171                                                      &commands, 0);
 172                         if (*commands == 'K' || *commands == 'k') {
 173                                 cmdline_memory_size <<= 10;
 174                                 commands++;
 175                         } else if (*commands=='M' || *commands=='m') {
 176                                 cmdline_memory_size <<= 20;
 177                                 commands++;
 178                         }
 179                 }
 180                 while (*commands && *commands != ' ')
 181                         commands++;
 182         }
 183 }
 184
 185 /* This routine will in the future do all the nasty prom stuff
 186  * to probe for the mmu type and its parameters, etc. This will
 187  * also be where SMP things happen plus the Sparc specific memory
 188  * physical memory probe as on the alpha.
 189  */
 190
 191 extern int prom_probe_memory(void);
 192 extern void sun4c_probe_vac(void);
 193 extern char cputypval;
 194 extern unsigned long start, end;
 195 extern void panic_setup(char *, int *);
 196
 197 extern unsigned short root_flags;
 198 extern unsigned short root_dev;
 199 extern unsigned short ram_flags;
 200 #define RAMDISK_IMAGE_START_MASK        0x07FF
 201 #define RAMDISK_PROMPT_FLAG             0x8000
 202 #define RAMDISK_LOAD_FLAG               0x4000
 203
 204 extern int root_mountflags;
 205
 206 char reboot_command[COMMAND_LINE_SIZE];
 207 enum sparc_cpu sparc_cpu_model;
 208
 209 struct tt_entry *sparc_ttable;
 210
 211 struct pt_regs fake_swapper_regs;
 212
 213 void __init setup_arch(char **cmdline_p)
 214 {
 215         int i;
 216         unsigned long highest_paddr;
 217
 218         sparc_ttable = (struct tt_entry *) &start;
 219
 220         /* Initialize PROM console and command line. */
 221         *cmdline_p = prom_getbootargs();
 222         strcpy(boot_command_line, *cmdline_p);
 223
 224         /* Set sparc_cpu_model */
 225         sparc_cpu_model = sun_unknown;
 226         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
 227         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
 228         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
 229         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
 230         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
 231         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
 232         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
 233
 234 #ifdef CONFIG_SUN4
 235         if (sparc_cpu_model != sun4) {
 236                 prom_printf("This kernel is for Sun4 architecture only.\n");
 237                 prom_halt();
 238         }
 239 #endif
 240         printk("ARCH: ");
 241         switch(sparc_cpu_model) {
 242         case sun4:
 243                 printk("SUN4\n");
 244                 break;
 245         case sun4c:
 246                 printk("SUN4C\n");
 247                 break;
 248         case sun4m:
 249                 printk("SUN4M\n");
 250                 break;
 251         case sun4d:
 252                 printk("SUN4D\n");
 253                 break;
 254         case sun4e:
 255                 printk("SUN4E\n");
 256                 break;
 257         case sun4u:
 258                 printk("SUN4U\n");
 259                 break;
 260         default:
 261                 printk("UNKNOWN!\n");
 262                 break;
 263         };
 264
 265 #ifdef CONFIG_DUMMY_CONSOLE
 266         conswitchp = &dummy_con;
 267 #elif defined(CONFIG_PROM_CONSOLE)
 268         conswitchp = &prom_con;
 269 #endif
 270         boot_flags_init(*cmdline_p);
 271
 272         idprom_init();
 273         if (ARCH_SUN4C_SUN4)
 274                 sun4c_probe_vac();
 275         load_mmu();
 276         (void) prom_probe_memory();
 277
 278         phys_base = 0xffffffffUL;
 279         highest_paddr = 0UL;
 280         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 281                 unsigned long top;
 282
 283                 if (sp_banks[i].base_addr < phys_base)
 284                         phys_base = sp_banks[i].base_addr;
 285                 top = sp_banks[i].base_addr +
 286                         sp_banks[i].num_bytes;
 287                 if (highest_paddr < top)
 288                         highest_paddr = top;
 289         }
 290         pfn_base = phys_base >> PAGE_SHIFT;
 291
 292         if (!root_flags)
 293                 root_mountflags &= ~MS_RDONLY;
 294         ROOT_DEV = old_decode_dev(root_dev);
 295 #ifdef CONFIG_BLK_DEV_RAM
 296         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 297         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 298         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 299 #endif
 300
 301         prom_setsync(prom_sync_me);
 302
 303         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 304            ((*(short *)linux_dbvec) != -1)) {
 305                 printk("Booted under KADB. Syncing trap table.\n");
 306                 (*(linux_dbvec->teach_debugger))();
 307         }
 308
 309         init_mm.context = (unsigned long) NO_CONTEXT;
 310         init_task.thread.kregs = &fake_swapper_regs;
 311
 312         paging_init();
 313
 314         smp_setup_cpu_possible_map();
 315 }
 316
 317 extern char *sparc_cpu_type;
 318 extern char *sparc_fpu_type;
 319
 320 static int ncpus_probed;
 321
 322 static int show_cpuinfo(struct seq_file *m, void *__unused)
 323 {
 324         seq_printf(m,
 325                    "cpu\t\t: %s\n"
 326                    "fpu\t\t: %s\n"
 327                    "promlib\t\t: Version %d Revision %d\n"
 328                    "prom\t\t: %d.%d\n"
 329                    "type\t\t: %s\n"
 330                    "ncpus probed\t: %d\n"
 331                    "ncpus active\t: %d\n"
 332 #ifndef CONFIG_SMP
 333                    "CPU0Bogo\t: %lu.%02lu\n"
 334                    "CPU0ClkTck\t: %ld\n"
 335 #endif
 336                    ,
 337                    sparc_cpu_type ? sparc_cpu_type : "undetermined",
 338                    sparc_fpu_type ? sparc_fpu_type : "undetermined",
 339                    romvec->pv_romvers,
 340                    prom_rev,
 341                    romvec->pv_printrev >> 16,
 342                    romvec->pv_printrev & 0xffff,
 343                    &cputypval,
 344                    ncpus_probed,
 345                    num_online_cpus()
 346 #ifndef CONFIG_SMP
 347                    , cpu_data(0).udelay_val/(500000/HZ),
 348                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 349                    cpu_data(0).clock_tick
 350 #endif
 351                 );
 352
 353 #ifdef CONFIG_SMP
 354         smp_bogo(m);
 355 #endif
 356         mmu_info(m);
 357 #ifdef CONFIG_SMP
 358         smp_info(m);
 359 #endif
 360         return 0;
 361 }
 362
 363 static void *c_start(struct seq_file *m, loff_t *pos)
 364 {
 365         /* The pointer we are returning is arbitrary,
 366          * it just has to be non-NULL and not IS_ERR
 367          * in the success case.
 368          */
 369         return *pos == 0 ? &c_start : NULL;
 370 }
 371
 372 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 373 {
 374         ++*pos;
 375         return c_start(m, pos);
 376 }
 377
 378 static void c_stop(struct seq_file *m, void *v)
 379 {
 380 }
 381
 382 const struct seq_operations cpuinfo_op = {
 383         .start =c_start,
 384         .next = c_next,
 385         .stop = c_stop,
 386         .show = show_cpuinfo,
 387 };
 388
 389 extern int stop_a_enabled;
 390
 391 void sun_do_break(void)
 392 {
 393         if (!stop_a_enabled)
 394                 return;
 395
 396         printk("\n");
 397         flush_user_windows();
 398
 399         prom_cmdline();
 400 }
 401
 402 int stop_a_enabled = 1;
 403
 404 static int __init topology_init(void)
 405 {
 406         int i, ncpus, err;
 407
 408         /* Count the number of physically present processors in
 409          * the machine, even on uniprocessor, so that /proc/cpuinfo
 410          * output is consistent with 2.4.x
 411          */
 412         ncpus = 0;
 413         while (!cpu_find_by_instance(ncpus, NULL, NULL))
 414                 ncpus++;
 415         ncpus_probed = ncpus;
 416
 417         err = 0;
 418         for_each_online_cpu(i) {
 419                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 420                 if (!p)
 421                         err = -ENOMEM;
 422                 else
 423                         register_cpu(p, i);
 424         }
 425
 426         return err;
 427 }
 428
 429 subsys_initcall(topology_init);