arch/sparc/kernel/setup.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 struct screen_info screen_info = {
  50         0, 0,                   /* orig-x, orig-y */
  51         0,                      /* unused */
  52         0,                      /* orig-video-page */
  53         0,                      /* orig-video-mode */
  54         128,                    /* orig-video-cols */
  55         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  56         54,                     /* orig-video-lines */
  57         0,                      /* orig-video-isVGA */
  58         16                      /* orig-video-points */
  59 };
  60
  61 /* Typing sync at the prom prompt calls the function pointed to by
  62  * romvec->pv_synchook which I set to the following function.
  63  * This should sync all filesystems and return, for now it just
  64  * prints out pretty messages and returns.
  65  */
  66
  67 extern unsigned long trapbase;
  68
  69 /* Pretty sick eh? */
  70 void prom_sync_me(void)
  71 {
  72         unsigned long prom_tbr, flags;
  73
  74         /* XXX Badly broken. FIX! - Anton */
  75         local_irq_save(flags);
  76         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
  77         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  78                              "nop\n\t"
  79                              "nop\n\t"
  80                              "nop\n\t" : : "r" (&trapbase));
  81
  82         prom_printf("PROM SYNC COMMAND...\n");
  83         show_free_areas();
  84         if(current->pid != 0) {
  85                 local_irq_enable();
  86                 sys_sync();
  87                 local_irq_disable();
  88         }
  89         prom_printf("Returning to prom\n");
  90
  91         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  92                              "nop\n\t"
  93                              "nop\n\t"
  94                              "nop\n\t" : : "r" (prom_tbr));
  95         local_irq_restore(flags);
  96
  97         return;
  98 }
  99
 100 unsigned int boot_flags __initdata = 0;
 101 #define BOOTME_DEBUG  0x1
 102
 103 /* Exported for mm/init.c:paging_init. */
 104 unsigned long cmdline_memory_size __initdata = 0;
 105
 106 static void
 107 prom_console_write(struct console *con, const char *s, unsigned n)
 108 {
 109         prom_write(s, n);
 110 }
 111
 112 static struct console prom_debug_console = {
 113         .name =         "debug",
 114         .write =        prom_console_write,
 115         .flags =        CON_PRINTBUFFER,
 116         .index =        -1,
 117 };
 118
 119 /*
 120  * Process kernel command line switches that are specific to the
 121  * SPARC or that require special low-level processing.
 122  */
 123 static void __init process_switch(char c)
 124 {
 125         switch (c) {
 126         case 'd':
 127                 boot_flags |= BOOTME_DEBUG;
 128                 break;
 129         case 's':
 130                 break;
 131         case 'h':
 132                 prom_printf("boot_flags_init: Halt!\n");
 133                 prom_halt();
 134                 break;
 135         case 'p':
 136                 /* Use PROM debug console. */
 137                 register_console(&prom_debug_console);
 138                 break;
 139         default:
 140                 printk("Unknown boot switch (-%c)\n", c);
 141                 break;
 142         }
 143 }
 144
 145 static void __init boot_flags_init(char *commands)
 146 {
 147         while (*commands) {
 148                 /* Move to the start of the next "argument". */
 149                 while (*commands && *commands == ' ')
 150                         commands++;
 151
 152                 /* Process any command switches, otherwise skip it. */
 153                 if (*commands == '\0')
 154                         break;
 155                 if (*commands == '-') {
 156                         commands++;
 157                         while (*commands && *commands != ' ')
 158                                 process_switch(*commands++);
 159                         continue;
 160                 }
 161                 if (!strncmp(commands, "mem=", 4)) {
 162                         /*
 163                          * "mem=XXX[kKmM] overrides the PROM-reported
 164                          * memory size.
 165                          */
 166                         cmdline_memory_size = simple_strtoul(commands + 4,
 167                                                      &commands, 0);
 168                         if (*commands == 'K' || *commands == 'k') {
 169                                 cmdline_memory_size <<= 10;
 170                                 commands++;
 171                         } else if (*commands=='M' || *commands=='m') {
 172                                 cmdline_memory_size <<= 20;
 173                                 commands++;
 174                         }
 175                 }
 176                 while (*commands && *commands != ' ')
 177                         commands++;
 178         }
 179 }
 180
 181 /* This routine will in the future do all the nasty prom stuff
 182  * to probe for the mmu type and its parameters, etc. This will
 183  * also be where SMP things happen.
 184  */
 185
 186 extern void sun4c_probe_vac(void);
 187 extern char cputypval;
 188 extern unsigned long start, end;
 189
 190 extern unsigned short root_flags;
 191 extern unsigned short root_dev;
 192 extern unsigned short ram_flags;
 193 #define RAMDISK_IMAGE_START_MASK        0x07FF
 194 #define RAMDISK_PROMPT_FLAG             0x8000
 195 #define RAMDISK_LOAD_FLAG               0x4000
 196
 197 extern int root_mountflags;
 198
 199 char reboot_command[COMMAND_LINE_SIZE];
 200 enum sparc_cpu sparc_cpu_model;
 201
 202 struct tt_entry *sparc_ttable;
 203
 204 struct pt_regs fake_swapper_regs;
 205
 206 void __init setup_arch(char **cmdline_p)
 207 {
 208         int i;
 209         unsigned long highest_paddr;
 210
 211         sparc_ttable = (struct tt_entry *) &start;
 212
 213         /* Initialize PROM console and command line. */
 214         *cmdline_p = prom_getbootargs();
 215         strcpy(boot_command_line, *cmdline_p);
 216
 217         /* Set sparc_cpu_model */
 218         sparc_cpu_model = sun_unknown;
 219         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
 220         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
 221         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
 222         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
 223         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
 224         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
 225         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
 226
 227 #ifdef CONFIG_SUN4
 228         if (sparc_cpu_model != sun4) {
 229                 prom_printf("This kernel is for Sun4 architecture only.\n");
 230                 prom_halt();
 231         }
 232 #endif
 233         printk("ARCH: ");
 234         switch(sparc_cpu_model) {
 235         case sun4:
 236                 printk("SUN4\n");
 237                 break;
 238         case sun4c:
 239                 printk("SUN4C\n");
 240                 break;
 241         case sun4m:
 242                 printk("SUN4M\n");
 243                 break;
 244         case sun4d:
 245                 printk("SUN4D\n");
 246                 break;
 247         case sun4e:
 248                 printk("SUN4E\n");
 249                 break;
 250         case sun4u:
 251                 printk("SUN4U\n");
 252                 break;
 253         default:
 254                 printk("UNKNOWN!\n");
 255                 break;
 256         };
 257
 258 #ifdef CONFIG_DUMMY_CONSOLE
 259         conswitchp = &dummy_con;
 260 #elif defined(CONFIG_PROM_CONSOLE)
 261         conswitchp = &prom_con;
 262 #endif
 263         boot_flags_init(*cmdline_p);
 264
 265         idprom_init();
 266         if (ARCH_SUN4C_SUN4)
 267                 sun4c_probe_vac();
 268         load_mmu();
 269
 270         phys_base = 0xffffffffUL;
 271         highest_paddr = 0UL;
 272         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 273                 unsigned long top;
 274
 275                 if (sp_banks[i].base_addr < phys_base)
 276                         phys_base = sp_banks[i].base_addr;
 277                 top = sp_banks[i].base_addr +
 278                         sp_banks[i].num_bytes;
 279                 if (highest_paddr < top)
 280                         highest_paddr = top;
 281         }
 282         pfn_base = phys_base >> PAGE_SHIFT;
 283
 284         if (!root_flags)
 285                 root_mountflags &= ~MS_RDONLY;
 286         ROOT_DEV = old_decode_dev(root_dev);
 287 #ifdef CONFIG_BLK_DEV_RAM
 288         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 289         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 290         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 291 #endif
 292
 293         prom_setsync(prom_sync_me);
 294
 295         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
 296            ((*(short *)linux_dbvec) != -1)) {
 297                 printk("Booted under KADB. Syncing trap table.\n");
 298                 (*(linux_dbvec->teach_debugger))();
 299         }
 300
 301         init_mm.context = (unsigned long) NO_CONTEXT;
 302         init_task.thread.kregs = &fake_swapper_regs;
 303
 304         paging_init();
 305
 306         smp_setup_cpu_possible_map();
 307 }
 308
 309 extern char *sparc_cpu_type;
 310 extern char *sparc_fpu_type;
 311
 312 static int ncpus_probed;
 313
 314 static int show_cpuinfo(struct seq_file *m, void *__unused)
 315 {
 316         seq_printf(m,
 317                    "cpu\t\t: %s\n"
 318                    "fpu\t\t: %s\n"
 319                    "promlib\t\t: Version %d Revision %d\n"
 320                    "prom\t\t: %d.%d\n"
 321                    "type\t\t: %s\n"
 322                    "ncpus probed\t: %d\n"
 323                    "ncpus active\t: %d\n"
 324 #ifndef CONFIG_SMP
 325                    "CPU0Bogo\t: %lu.%02lu\n"
 326                    "CPU0ClkTck\t: %ld\n"
 327 #endif
 328                    ,
 329                    sparc_cpu_type ? sparc_cpu_type : "undetermined",
 330                    sparc_fpu_type ? sparc_fpu_type : "undetermined",
 331                    romvec->pv_romvers,
 332                    prom_rev,
 333                    romvec->pv_printrev >> 16,
 334                    romvec->pv_printrev & 0xffff,
 335                    &cputypval,
 336                    ncpus_probed,
 337                    num_online_cpus()
 338 #ifndef CONFIG_SMP
 339                    , cpu_data(0).udelay_val/(500000/HZ),
 340                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 341                    cpu_data(0).clock_tick
 342 #endif
 343                 );
 344
 345 #ifdef CONFIG_SMP
 346         smp_bogo(m);
 347 #endif
 348         mmu_info(m);
 349 #ifdef CONFIG_SMP
 350         smp_info(m);
 351 #endif
 352         return 0;
 353 }
 354
 355 static void *c_start(struct seq_file *m, loff_t *pos)
 356 {
 357         /* The pointer we are returning is arbitrary,
 358          * it just has to be non-NULL and not IS_ERR
 359          * in the success case.
 360          */
 361         return *pos == 0 ? &c_start : NULL;
 362 }
 363
 364 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 365 {
 366         ++*pos;
 367         return c_start(m, pos);
 368 }
 369
 370 static void c_stop(struct seq_file *m, void *v)
 371 {
 372 }
 373
 374 const struct seq_operations cpuinfo_op = {
 375         .start =c_start,
 376         .next = c_next,
 377         .stop = c_stop,
 378         .show = show_cpuinfo,
 379 };
 380
 381 extern int stop_a_enabled;
 382
 383 void sun_do_break(void)
 384 {
 385         if (!stop_a_enabled)
 386                 return;
 387
 388         printk("\n");
 389         flush_user_windows();
 390
 391         prom_cmdline();
 392 }
 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);