arch/sparc/kernel/setup_32.c

   1 /*
   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/screen_info.h>
  20 #include <linux/delay.h>
  21 #include <linux/fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/syscalls.h>
  24 #include <linux/kdev_t.h>
  25 #include <linux/major.h>
  26 #include <linux/string.h>
  27 #include <linux/init.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/console.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/root_dev.h>
  32 #include <linux/cpu.h>
  33 #include <linux/kdebug.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/mbus.h>
  44 #include <asm/idprom.h>
  45 #include <asm/machines.h>
  46 #include <asm/cpudata.h>
  47 #include <asm/setup.h>
  48
  49 #include "kernel.h"
  50
  51 struct screen_info screen_info = {
  52         0, 0,                   /* orig-x, orig-y */
  53         0,                      /* unused */
  54         0,                      /* orig-video-page */
  55         0,                      /* orig-video-mode */
  56         128,                    /* orig-video-cols */
  57         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  58         54,                     /* orig-video-lines */
  59         0,                      /* orig-video-isVGA */
  60         16                      /* orig-video-points */
  61 };
  62
  63 /* Typing sync at the prom prompt calls the function pointed to by
  64  * romvec->pv_synchook which I set to the following function.
  65  * This should sync all filesystems and return, for now it just
  66  * prints out pretty messages and returns.
  67  */
  68
  69 extern unsigned long trapbase;
  70
  71 /* Pretty sick eh? */
  72 static 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         prom_printf("PROM SYNC COMMAND...\n");
  85         show_free_areas();
  86         if(current->pid != 0) {
  87                 local_irq_enable();
  88                 sys_sync();
  89                 local_irq_disable();
  90         }
  91         prom_printf("Returning to prom\n");
  92
  93         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  94                              "nop\n\t"
  95                              "nop\n\t"
  96                              "nop\n\t" : : "r" (prom_tbr));
  97         local_irq_restore(flags);
  98
  99         return;
 100 }
 101
 102 static unsigned int boot_flags __initdata = 0;
 103 #define BOOTME_DEBUG  0x1
 104
 105 /* Exported for mm/init.c:paging_init. */
 106 unsigned long cmdline_memory_size __initdata = 0;
 107
 108 static void
 109 prom_console_write(struct console *con, const char *s, unsigned n)
 110 {
 111         prom_write(s, n);
 112 }
 113
 114 static struct console prom_debug_console = {
 115         .name =         "debug",
 116         .write =        prom_console_write,
 117         .flags =        CON_PRINTBUFFER,
 118         .index =        -1,
 119 };
 120
 121 /*
 122  * Process kernel command line switches that are specific to the
 123  * SPARC or that require special low-level processing.
 124  */
 125 static void __init process_switch(char c)
 126 {
 127         switch (c) {
 128         case 'd':
 129                 boot_flags |= BOOTME_DEBUG;
 130                 break;
 131         case 's':
 132                 break;
 133         case 'h':
 134                 prom_printf("boot_flags_init: Halt!\n");
 135                 prom_halt();
 136                 break;
 137         case 'p':
 138                 /* Use PROM debug console. */
 139                 register_console(&prom_debug_console);
 140                 break;
 141         default:
 142                 printk("Unknown boot switch (-%c)\n", c);
 143                 break;
 144         }
 145 }
 146
 147 static void __init boot_flags_init(char *commands)
 148 {
 149         while (*commands) {
 150                 /* Move to the start of the next "argument". */
 151                 while (*commands && *commands == ' ')
 152                         commands++;
 153
 154                 /* Process any command switches, otherwise skip it. */
 155                 if (*commands == '\0')
 156                         break;
 157                 if (*commands == '-') {
 158                         commands++;
 159                         while (*commands && *commands != ' ')
 160                                 process_switch(*commands++);
 161                         continue;
 162                 }
 163                 if (!strncmp(commands, "mem=", 4)) {
 164                         /*
 165                          * "mem=XXX[kKmM] overrides the PROM-reported
 166                          * memory size.
 167                          */
 168                         cmdline_memory_size = simple_strtoul(commands + 4,
 169                                                      &commands, 0);
 170                         if (*commands == 'K' || *commands == 'k') {
 171                                 cmdline_memory_size <<= 10;
 172                                 commands++;
 173                         } else if (*commands=='M' || *commands=='m') {
 174                                 cmdline_memory_size <<= 20;
 175                                 commands++;
 176                         }
 177                 }
 178                 while (*commands && *commands != ' ')
 179                         commands++;
 180         }
 181 }
 182
 183 /* This routine will in the future do all the nasty prom stuff
 184  * to probe for the mmu type and its parameters, etc. This will
 185  * also be where SMP things happen.
 186  */
 187
 188 extern void sun4c_probe_vac(void);
 189 extern char cputypval;
 190 extern unsigned long start, end;
 191
 192 extern unsigned short root_flags;
 193 extern unsigned short root_dev;
 194 extern unsigned short ram_flags;
 195 #define RAMDISK_IMAGE_START_MASK        0x07FF
 196 #define RAMDISK_PROMPT_FLAG             0x8000
 197 #define RAMDISK_LOAD_FLAG               0x4000
 198
 199 extern int root_mountflags;
 200
 201 char reboot_command[COMMAND_LINE_SIZE];
 202
 203 enum sparc_cpu sparc_cpu_model;
 204 EXPORT_SYMBOL(sparc_cpu_model);
 205
 206 struct tt_entry *sparc_ttable;
 207
 208 struct pt_regs fake_swapper_regs;
 209
 210 void __init setup_arch(char **cmdline_p)
 211 {
 212         int i;
 213         unsigned long highest_paddr;
 214
 215         sparc_ttable = (struct tt_entry *) &start;
 216
 217         /* Initialize PROM console and command line. */
 218         *cmdline_p = prom_getbootargs();
 219         strcpy(boot_command_line, *cmdline_p);
 220         parse_early_param();
 221
 222         /* Set sparc_cpu_model */
 223         sparc_cpu_model = sun_unknown;
 224         if (!strcmp(&cputypval,"sun4 "))
 225                 sparc_cpu_model = sun4;
 226         if (!strcmp(&cputypval,"sun4c"))
 227                 sparc_cpu_model = sun4c;
 228         if (!strcmp(&cputypval,"sun4m"))
 229                 sparc_cpu_model = sun4m;
 230         if (!strcmp(&cputypval,"sun4s"))
 231                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
 232         if (!strcmp(&cputypval,"sun4d"))
 233                 sparc_cpu_model = sun4d;
 234         if (!strcmp(&cputypval,"sun4e"))
 235                 sparc_cpu_model = sun4e;
 236         if (!strcmp(&cputypval,"sun4u"))
 237                 sparc_cpu_model = sun4u;
 238
 239         printk("ARCH: ");
 240         switch(sparc_cpu_model) {
 241         case sun4:
 242                 printk("SUN4\n");
 243                 break;
 244         case sun4c:
 245                 printk("SUN4C\n");
 246                 break;
 247         case sun4m:
 248                 printk("SUN4M\n");
 249                 break;
 250         case sun4d:
 251                 printk("SUN4D\n");
 252                 break;
 253         case sun4e:
 254                 printk("SUN4E\n");
 255                 break;
 256         case sun4u:
 257                 printk("SUN4U\n");
 258                 break;
 259         default:
 260                 printk("UNKNOWN!\n");
 261                 break;
 262         };
 263
 264 #ifdef CONFIG_DUMMY_CONSOLE
 265         conswitchp = &dummy_con;
 266 #elif defined(CONFIG_PROM_CONSOLE)
 267         conswitchp = &prom_con;
 268 #endif
 269         boot_flags_init(*cmdline_p);
 270
 271         idprom_init();
 272         if (ARCH_SUN4C)
 273                 sun4c_probe_vac();
 274         load_mmu();
 275
 276         phys_base = 0xffffffffUL;
 277         highest_paddr = 0UL;
 278         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 279                 unsigned long top;
 280
 281                 if (sp_banks[i].base_addr < phys_base)
 282                         phys_base = sp_banks[i].base_addr;
 283                 top = sp_banks[i].base_addr +
 284                         sp_banks[i].num_bytes;
 285                 if (highest_paddr < top)
 286                         highest_paddr = top;
 287         }
 288         pfn_base = phys_base >> PAGE_SHIFT;
 289
 290         if (!root_flags)
 291                 root_mountflags &= ~MS_RDONLY;
 292         ROOT_DEV = old_decode_dev(root_dev);
 293 #ifdef CONFIG_BLK_DEV_RAM
 294         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 295         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 296         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 297 #endif
 298
 299         prom_setsync(prom_sync_me);
 300
 301         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 302            ((*(short *)linux_dbvec) != -1)) {
 303                 printk("Booted under KADB. Syncing trap table.\n");
 304                 (*(linux_dbvec->teach_debugger))();
 305         }
 306
 307         init_mm.context = (unsigned long) NO_CONTEXT;
 308         init_task.thread.kregs = &fake_swapper_regs;
 309
 310         paging_init();
 311
 312         smp_setup_cpu_possible_map();
 313 }
 314
 315 static int ncpus_probed;
 316
 317 static int show_cpuinfo(struct seq_file *m, void *__unused)
 318 {
 319         seq_printf(m,
 320                    "cpu\t\t: %s\n"
 321                    "fpu\t\t: %s\n"
 322                    "promlib\t\t: Version %d Revision %d\n"
 323                    "prom\t\t: %d.%d\n"
 324                    "type\t\t: %s\n"
 325                    "ncpus probed\t: %d\n"
 326                    "ncpus active\t: %d\n"
 327 #ifndef CONFIG_SMP
 328                    "CPU0Bogo\t: %lu.%02lu\n"
 329                    "CPU0ClkTck\t: %ld\n"
 330 #endif
 331                    ,
 332                    sparc_cpu_type,
 333                    sparc_fpu_type ,
 334                    romvec->pv_romvers,
 335                    prom_rev,
 336                    romvec->pv_printrev >> 16,
 337                    romvec->pv_printrev & 0xffff,
 338                    &cputypval,
 339                    ncpus_probed,
 340                    num_online_cpus()
 341 #ifndef CONFIG_SMP
 342                    , cpu_data(0).udelay_val/(500000/HZ),
 343                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 344                    cpu_data(0).clock_tick
 345 #endif
 346                 );
 347
 348 #ifdef CONFIG_SMP
 349         smp_bogo(m);
 350 #endif
 351         mmu_info(m);
 352 #ifdef CONFIG_SMP
 353         smp_info(m);
 354 #endif
 355         return 0;
 356 }
 357
 358 static void *c_start(struct seq_file *m, loff_t *pos)
 359 {
 360         /* The pointer we are returning is arbitrary,
 361          * it just has to be non-NULL and not IS_ERR
 362          * in the success case.
 363          */
 364         return *pos == 0 ? &c_start : NULL;
 365 }
 366
 367 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 368 {
 369         ++*pos;
 370         return c_start(m, pos);
 371 }
 372
 373 static void c_stop(struct seq_file *m, void *v)
 374 {
 375 }
 376
 377 const struct seq_operations cpuinfo_op = {
 378         .start =c_start,
 379         .next = c_next,
 380         .stop = c_stop,
 381         .show = show_cpuinfo,
 382 };
 383
 384 extern int stop_a_enabled;
 385
 386 void sun_do_break(void)
 387 {
 388         if (!stop_a_enabled)
 389                 return;
 390
 391         printk("\n");
 392         flush_user_windows();
 393
 394         prom_cmdline();
 395 }
 396 EXPORT_SYMBOL(sun_do_break);
 397
 398 int stop_a_enabled = 1;
 399
 400 static int __init topology_init(void)
 401 {
 402         int i, ncpus, err;
 403
 404         /* Count the number of physically present processors in
 405          * the machine, even on uniprocessor, so that /proc/cpuinfo
 406          * output is consistent with 2.4.x
 407          */
 408         ncpus = 0;
 409         while (!cpu_find_by_instance(ncpus, NULL, NULL))
 410                 ncpus++;
 411         ncpus_probed = ncpus;
 412
 413         err = 0;
 414         for_each_online_cpu(i) {
 415                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 416                 if (!p)
 417                         err = -ENOMEM;
 418                 else
 419                         register_cpu(p, i);
 420         }
 421
 422         return err;
 423 }
 424
 425 subsys_initcall(topology_init);