release/src-rt-6.x.4708/linux/linux-2.6.36/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         local_irq_save(flags);
  77         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
  78         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  79                              "nop\n\t"
  80                              "nop\n\t"
  81                              "nop\n\t" : : "r" (&trapbase));
  82
  83         prom_printf("PROM SYNC COMMAND...\n");
  84         show_free_areas();
  85         if(current->pid != 0) {
  86                 local_irq_enable();
  87                 sys_sync();
  88                 local_irq_disable();
  89         }
  90         prom_printf("Returning to prom\n");
  91
  92         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  93                              "nop\n\t"
  94                              "nop\n\t"
  95                              "nop\n\t" : : "r" (prom_tbr));
  96         local_irq_restore(flags);
  97 }
  98
  99 static unsigned int boot_flags __initdata = 0;
 100 #define BOOTME_DEBUG  0x1
 101
 102 /* Exported for mm/init.c:paging_init. */
 103 unsigned long cmdline_memory_size __initdata = 0;
 104
 105 static void
 106 prom_console_write(struct console *con, const char *s, unsigned n)
 107 {
 108         prom_write(s, n);
 109 }
 110
 111 static struct console prom_debug_console = {
 112         .name =         "debug",
 113         .write =        prom_console_write,
 114         .flags =        CON_PRINTBUFFER,
 115         .index =        -1,
 116 };
 117
 118 /*
 119  * Process kernel command line switches that are specific to the
 120  * SPARC or that require special low-level processing.
 121  */
 122 static void __init process_switch(char c)
 123 {
 124         switch (c) {
 125         case 'd':
 126                 boot_flags |= BOOTME_DEBUG;
 127                 break;
 128         case 's':
 129                 break;
 130         case 'h':
 131                 prom_printf("boot_flags_init: Halt!\n");
 132                 prom_halt();
 133                 break;
 134         case 'p':
 135                 /* Use PROM debug console. */
 136                 register_console(&prom_debug_console);
 137                 break;
 138         default:
 139                 printk("Unknown boot switch (-%c)\n", c);
 140                 break;
 141         }
 142 }
 143
 144 static void __init boot_flags_init(char *commands)
 145 {
 146         while (*commands) {
 147                 /* Move to the start of the next "argument". */
 148                 while (*commands && *commands == ' ')
 149                         commands++;
 150
 151                 /* Process any command switches, otherwise skip it. */
 152                 if (*commands == '\0')
 153                         break;
 154                 if (*commands == '-') {
 155                         commands++;
 156                         while (*commands && *commands != ' ')
 157                                 process_switch(*commands++);
 158                         continue;
 159                 }
 160                 if (!strncmp(commands, "mem=", 4)) {
 161                         cmdline_memory_size = simple_strtoul(commands + 4,
 162                                                      &commands, 0);
 163                         if (*commands == 'K' || *commands == 'k') {
 164                                 cmdline_memory_size <<= 10;
 165                                 commands++;
 166                         } else if (*commands=='M' || *commands=='m') {
 167                                 cmdline_memory_size <<= 20;
 168                                 commands++;
 169                         }
 170                 }
 171                 while (*commands && *commands != ' ')
 172                         commands++;
 173         }
 174 }
 175
 176 /* This routine will in the future do all the nasty prom stuff
 177  * to probe for the mmu type and its parameters, etc. This will
 178  * also be where SMP things happen.
 179  */
 180
 181 extern void sun4c_probe_vac(void);
 182 extern char cputypval;
 183 extern unsigned long start, end;
 184
 185 extern unsigned short root_flags;
 186 extern unsigned short root_dev;
 187 extern unsigned short ram_flags;
 188 #define RAMDISK_IMAGE_START_MASK        0x07FF
 189 #define RAMDISK_PROMPT_FLAG             0x8000
 190 #define RAMDISK_LOAD_FLAG               0x4000
 191
 192 extern int root_mountflags;
 193
 194 char reboot_command[COMMAND_LINE_SIZE];
 195
 196 enum sparc_cpu sparc_cpu_model;
 197 EXPORT_SYMBOL(sparc_cpu_model);
 198
 199 struct tt_entry *sparc_ttable;
 200
 201 struct pt_regs fake_swapper_regs;
 202
 203 void __init setup_arch(char **cmdline_p)
 204 {
 205         int i;
 206         unsigned long highest_paddr;
 207
 208         sparc_ttable = (struct tt_entry *) &start;
 209
 210         /* Initialize PROM console and command line. */
 211         *cmdline_p = prom_getbootargs();
 212         strcpy(boot_command_line, *cmdline_p);
 213         parse_early_param();
 214
 215         /* Set sparc_cpu_model */
 216         sparc_cpu_model = sun_unknown;
 217         if (!strcmp(&cputypval,"sun4 "))
 218                 sparc_cpu_model = sun4;
 219         if (!strcmp(&cputypval,"sun4c"))
 220                 sparc_cpu_model = sun4c;
 221         if (!strcmp(&cputypval,"sun4m"))
 222                 sparc_cpu_model = sun4m;
 223         if (!strcmp(&cputypval,"sun4s"))
 224                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
 225         if (!strcmp(&cputypval,"sun4d"))
 226                 sparc_cpu_model = sun4d;
 227         if (!strcmp(&cputypval,"sun4e"))
 228                 sparc_cpu_model = sun4e;
 229         if (!strcmp(&cputypval,"sun4u"))
 230                 sparc_cpu_model = sun4u;
 231         if (!strncmp(&cputypval, "leon" , 4))
 232                 sparc_cpu_model = sparc_leon;
 233
 234         printk("ARCH: ");
 235         switch(sparc_cpu_model) {
 236         case sun4:
 237                 printk("SUN4\n");
 238                 break;
 239         case sun4c:
 240                 printk("SUN4C\n");
 241                 break;
 242         case sun4m:
 243                 printk("SUN4M\n");
 244                 break;
 245         case sun4d:
 246                 printk("SUN4D\n");
 247                 break;
 248         case sun4e:
 249                 printk("SUN4E\n");
 250                 break;
 251         case sun4u:
 252                 printk("SUN4U\n");
 253                 break;
 254         case sparc_leon:
 255                 printk("LEON\n");
 256                 break;
 257         default:
 258                 printk("UNKNOWN!\n");
 259                 break;
 260         };
 261
 262 #ifdef CONFIG_DUMMY_CONSOLE
 263         conswitchp = &dummy_con;
 264 #endif
 265         boot_flags_init(*cmdline_p);
 266
 267         idprom_init();
 268         if (ARCH_SUN4C)
 269                 sun4c_probe_vac();
 270         load_mmu();
 271
 272         phys_base = 0xffffffffUL;
 273         highest_paddr = 0UL;
 274         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 275                 unsigned long top;
 276
 277                 if (sp_banks[i].base_addr < phys_base)
 278                         phys_base = sp_banks[i].base_addr;
 279                 top = sp_banks[i].base_addr +
 280                         sp_banks[i].num_bytes;
 281                 if (highest_paddr < top)
 282                         highest_paddr = top;
 283         }
 284         pfn_base = phys_base >> PAGE_SHIFT;
 285
 286         if (!root_flags)
 287                 root_mountflags &= ~MS_RDONLY;
 288         ROOT_DEV = old_decode_dev(root_dev);
 289 #ifdef CONFIG_BLK_DEV_RAM
 290         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 291         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 292         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 293 #endif
 294
 295         prom_setsync(prom_sync_me);
 296
 297         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 298            ((*(short *)linux_dbvec) != -1)) {
 299                 printk("Booted under KADB. Syncing trap table.\n");
 300                 (*(linux_dbvec->teach_debugger))();
 301         }
 302
 303         init_mm.context = (unsigned long) NO_CONTEXT;
 304         init_task.thread.kregs = &fake_swapper_regs;
 305
 306         paging_init();
 307
 308         smp_setup_cpu_possible_map();
 309 }
 310
 311 static int ncpus_probed;
 312
 313 static int show_cpuinfo(struct seq_file *m, void *__unused)
 314 {
 315         seq_printf(m,
 316                    "cpu\t\t: %s\n"
 317                    "fpu\t\t: %s\n"
 318                    "promlib\t\t: Version %d Revision %d\n"
 319                    "prom\t\t: %d.%d\n"
 320                    "type\t\t: %s\n"
 321                    "ncpus probed\t: %d\n"
 322                    "ncpus active\t: %d\n"
 323 #ifndef CONFIG_SMP
 324                    "CPU0Bogo\t: %lu.%02lu\n"
 325                    "CPU0ClkTck\t: %ld\n"
 326 #endif
 327                    ,
 328                    sparc_cpu_type,
 329                    sparc_fpu_type ,
 330                    romvec->pv_romvers,
 331                    prom_rev,
 332                    romvec->pv_printrev >> 16,
 333                    romvec->pv_printrev & 0xffff,
 334                    &cputypval,
 335                    ncpus_probed,
 336                    num_online_cpus()
 337 #ifndef CONFIG_SMP
 338                    , cpu_data(0).udelay_val/(500000/HZ),
 339                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 340                    cpu_data(0).clock_tick
 341 #endif
 342                 );
 343
 344 #ifdef CONFIG_SMP
 345         smp_bogo(m);
 346 #endif
 347         mmu_info(m);
 348 #ifdef CONFIG_SMP
 349         smp_info(m);
 350 #endif
 351         return 0;
 352 }
 353
 354 static void *c_start(struct seq_file *m, loff_t *pos)
 355 {
 356         /* The pointer we are returning is arbitrary,
 357          * it just has to be non-NULL and not IS_ERR
 358          * in the success case.
 359          */
 360         return *pos == 0 ? &c_start : NULL;
 361 }
 362
 363 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 364 {
 365         ++*pos;
 366         return c_start(m, pos);
 367 }
 368
 369 static void c_stop(struct seq_file *m, void *v)
 370 {
 371 }
 372
 373 const struct seq_operations cpuinfo_op = {
 374         .start =c_start,
 375         .next = c_next,
 376         .stop = c_stop,
 377         .show = show_cpuinfo,
 378 };
 379
 380 extern int stop_a_enabled;
 381
 382 void sun_do_break(void)
 383 {
 384         if (!stop_a_enabled)
 385                 return;
 386
 387         printk("\n");
 388         flush_user_windows();
 389
 390         prom_cmdline();
 391 }
 392 EXPORT_SYMBOL(sun_do_break);
 393
 394 int stop_a_enabled = 1;
 395
 396 static int __init topology_init(void)
 397 {
 398         int i, ncpus, err;
 399
 400         /* Count the number of physically present processors in
 401          * the machine, even on uniprocessor, so that /proc/cpuinfo
 402          * output is consistent with 2.4.x
 403          */
 404         ncpus = 0;
 405         while (!cpu_find_by_instance(ncpus, NULL, NULL))
 406                 ncpus++;
 407         ncpus_probed = ncpus;
 408
 409         err = 0;
 410         for_each_online_cpu(i) {
 411                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 412                 if (!p)
 413                         err = -ENOMEM;
 414                 else
 415                         register_cpu(p, i);
 416         }
 417
 418         return err;
 419 }
 420
 421 subsys_initcall(topology_init);