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   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/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 void (*prom_palette)(int);
  69
  70 /* Pretty sick eh? */
  71 void prom_sync_me(void)
  72 {
  73         unsigned long prom_tbr, flags;
  74
  75         /* XXX Badly broken. FIX! - Anton */
  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         if (prom_palette)
  84                 prom_palette(1);
  85         prom_printf("PROM SYNC COMMAND...\n");
  86         show_free_areas();
  87         if(current->pid != 0) {
  88                 local_irq_enable();
  89                 sys_sync();
  90                 local_irq_disable();
  91         }
  92         prom_printf("Returning to prom\n");
  93
  94         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
  95                              "nop\n\t"
  96                              "nop\n\t"
  97                              "nop\n\t" : : "r" (prom_tbr));
  98         local_irq_restore(flags);
  99
 100         return;
 101 }
 102
 103 unsigned int boot_flags __initdata = 0;
 104 #define BOOTME_DEBUG  0x1
 105
 106 /* Exported for mm/init.c:paging_init. */
 107 unsigned long cmdline_memory_size __initdata = 0;
 108
 109 static void
 110 prom_console_write(struct console *con, const char *s, unsigned n)
 111 {
 112         prom_write(s, n);
 113 }
 114
 115 static struct console prom_debug_console = {
 116         .name =         "debug",
 117         .write =        prom_console_write,
 118         .flags =        CON_PRINTBUFFER,
 119         .index =        -1,
 120 };
 121
 122 /*
 123  * Process kernel command line switches that are specific to the
 124  * SPARC or that require special low-level processing.
 125  */
 126 static void __init process_switch(char c)
 127 {
 128         switch (c) {
 129         case 'd':
 130                 boot_flags |= BOOTME_DEBUG;
 131                 break;
 132         case 's':
 133                 break;
 134         case 'h':
 135                 prom_printf("boot_flags_init: Halt!\n");
 136                 prom_halt();
 137                 break;
 138         case 'p':
 139                 /* Use PROM debug console. */
 140                 register_console(&prom_debug_console);
 141                 break;
 142         default:
 143                 printk("Unknown boot switch (-%c)\n", c);
 144                 break;
 145         }
 146 }
 147
 148 static void __init boot_flags_init(char *commands)
 149 {
 150         while (*commands) {
 151                 /* Move to the start of the next "argument". */
 152                 while (*commands && *commands == ' ')
 153                         commands++;
 154
 155                 /* Process any command switches, otherwise skip it. */
 156                 if (*commands == '\0')
 157                         break;
 158                 if (*commands == '-') {
 159                         commands++;
 160                         while (*commands && *commands != ' ')
 161                                 process_switch(*commands++);
 162                         continue;
 163                 }
 164                 if (!strncmp(commands, "mem=", 4)) {
 165                         /*
 166                          * "mem=XXX[kKmM] overrides the PROM-reported
 167                          * memory size.
 168                          */
 169                         cmdline_memory_size = simple_strtoul(commands + 4,
 170                                                      &commands, 0);
 171                         if (*commands == 'K' || *commands == 'k') {
 172                                 cmdline_memory_size <<= 10;
 173                                 commands++;
 174                         } else if (*commands=='M' || *commands=='m') {
 175                                 cmdline_memory_size <<= 20;
 176                                 commands++;
 177                         }
 178                 }
 179                 while (*commands && *commands != ' ')
 180                         commands++;
 181         }
 182 }
 183
 184 /* This routine will in the future do all the nasty prom stuff
 185  * to probe for the mmu type and its parameters, etc. This will
 186  * also be where SMP things happen plus the Sparc specific memory
 187  * physical memory probe as on the alpha.
 188  */
 189
 190 extern int prom_probe_memory(void);
 191 extern void sun4c_probe_vac(void);
 192 extern char cputypval;
 193 extern unsigned long start, end;
 194
 195 extern unsigned short root_flags;
 196 extern unsigned short root_dev;
 197 extern unsigned short ram_flags;
 198 #define RAMDISK_IMAGE_START_MASK        0x07FF
 199 #define RAMDISK_PROMPT_FLAG             0x8000
 200 #define RAMDISK_LOAD_FLAG               0x4000
 201
 202 extern int root_mountflags;
 203
 204 char reboot_command[COMMAND_LINE_SIZE];
 205 enum sparc_cpu sparc_cpu_model;
 206
 207 struct tt_entry *sparc_ttable;
 208
 209 struct pt_regs fake_swapper_regs;
 210
 211 void __init setup_arch(char **cmdline_p)
 212 {
 213         int i;
 214         unsigned long highest_paddr;
 215
 216         sparc_ttable = (struct tt_entry *) &start;
 217
 218         /* Initialize PROM console and command line. */
 219         *cmdline_p = prom_getbootargs();
 220         strcpy(boot_command_line, *cmdline_p);
 221
 222         /* Set sparc_cpu_model */
 223         sparc_cpu_model = sun_unknown;
 224         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
 225         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
 226         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
 227         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
 228         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
 229         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
 230         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
 231
 232 #ifdef CONFIG_SUN4
 233         if (sparc_cpu_model != sun4) {
 234                 prom_printf("This kernel is for Sun4 architecture only.\n");
 235                 prom_halt();
 236         }
 237 #endif
 238         printk("ARCH: ");
 239         switch(sparc_cpu_model) {
 240         case sun4:
 241                 printk("SUN4\n");
 242                 break;
 243         case sun4c:
 244                 printk("SUN4C\n");
 245                 break;
 246         case sun4m:
 247                 printk("SUN4M\n");
 248                 break;
 249         case sun4d:
 250                 printk("SUN4D\n");
 251                 break;
 252         case sun4e:
 253                 printk("SUN4E\n");
 254                 break;
 255         case sun4u:
 256                 printk("SUN4U\n");
 257                 break;
 258         default:
 259                 printk("UNKNOWN!\n");
 260                 break;
 261         };
 262
 263 #ifdef CONFIG_DUMMY_CONSOLE
 264         conswitchp = &dummy_con;
 265 #elif defined(CONFIG_PROM_CONSOLE)
 266         conswitchp = &prom_con;
 267 #endif
 268         boot_flags_init(*cmdline_p);
 269
 270         idprom_init();
 271         if (ARCH_SUN4C_SUN4)
 272                 sun4c_probe_vac();
 273         load_mmu();
 274         (void) prom_probe_memory();
 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 extern char *sparc_cpu_type;
 316 extern char *sparc_fpu_type;
 317
 318 static int ncpus_probed;
 319
 320 static int show_cpuinfo(struct seq_file *m, void *__unused)
 321 {
 322         seq_printf(m,
 323                    "cpu\t\t: %s\n"
 324                    "fpu\t\t: %s\n"
 325                    "promlib\t\t: Version %d Revision %d\n"
 326                    "prom\t\t: %d.%d\n"
 327                    "type\t\t: %s\n"
 328                    "ncpus probed\t: %d\n"
 329                    "ncpus active\t: %d\n"
 330 #ifndef CONFIG_SMP
 331                    "CPU0Bogo\t: %lu.%02lu\n"
 332                    "CPU0ClkTck\t: %ld\n"
 333 #endif
 334                    ,
 335                    sparc_cpu_type ? sparc_cpu_type : "undetermined",
 336                    sparc_fpu_type ? sparc_fpu_type : "undetermined",
 337                    romvec->pv_romvers,
 338                    prom_rev,
 339                    romvec->pv_printrev >> 16,
 340                    romvec->pv_printrev & 0xffff,
 341                    &cputypval,
 342                    ncpus_probed,
 343                    num_online_cpus()
 344 #ifndef CONFIG_SMP
 345                    , cpu_data(0).udelay_val/(500000/HZ),
 346                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
 347                    cpu_data(0).clock_tick
 348 #endif
 349                 );
 350
 351 #ifdef CONFIG_SMP
 352         smp_bogo(m);
 353 #endif
 354         mmu_info(m);
 355 #ifdef CONFIG_SMP
 356         smp_info(m);
 357 #endif
 358         return 0;
 359 }
 360
 361 static void *c_start(struct seq_file *m, loff_t *pos)
 362 {
 363         /* The pointer we are returning is arbitrary,
 364          * it just has to be non-NULL and not IS_ERR
 365          * in the success case.
 366          */
 367         return *pos == 0 ? &c_start : NULL;
 368 }
 369
 370 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 371 {
 372         ++*pos;
 373         return c_start(m, pos);
 374 }
 375
 376 static void c_stop(struct seq_file *m, void *v)
 377 {
 378 }
 379
 380 const struct seq_operations cpuinfo_op = {
 381         .start =c_start,
 382         .next = c_next,
 383         .stop = c_stop,
 384         .show = show_cpuinfo,
 385 };
 386
 387 extern int stop_a_enabled;
 388
 389 void sun_do_break(void)
 390 {
 391         if (!stop_a_enabled)
 392                 return;
 393
 394         printk("\n");
 395         flush_user_windows();
 396
 397         prom_cmdline();
 398 }
 399
 400 int stop_a_enabled = 1;
 401
 402 static int __init topology_init(void)
 403 {
 404         int i, ncpus, err;
 405
 406         /* Count the number of physically present processors in
 407          * the machine, even on uniprocessor, so that /proc/cpuinfo
 408          * output is consistent with 2.4.x
 409          */
 410         ncpus = 0;
 411         while (!cpu_find_by_instance(ncpus, NULL, NULL))
 412                 ncpus++;
 413         ncpus_probed = ncpus;
 414
 415         err = 0;
 416         for_each_online_cpu(i) {
 417                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 418                 if (!p)
 419                         err = -ENOMEM;
 420                 else
 421                         register_cpu(p, i);
 422         }
 423
 424         return err;
 425 }
 426
 427 subsys_initcall(topology_init);