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 #include <linux/export.h>
  35 #include <linux/start_kernel.h>
  36
  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/cpudata.h>
  47 #include <asm/setup.h>
  48 #include <asm/cacheflush.h>
  49 #include <asm/sections.h>
  50
  51 #include "kernel.h"
  52
  53 struct screen_info screen_info = {
  54         0, 0,                   /* orig-x, orig-y */
  55         0,                      /* unused */
  56         0,                      /* orig-video-page */
  57         0,                      /* orig-video-mode */
  58         128,                    /* orig-video-cols */
  59         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
  60         54,                     /* orig-video-lines */
  61         0,                      /* orig-video-isVGA */
  62         16                      /* orig-video-points */
  63 };
  64
  65 /* Typing sync at the prom prompt calls the function pointed to by
  66  * romvec->pv_synchook which I set to the following function.
  67  * This should sync all filesystems and return, for now it just
  68  * prints out pretty messages and returns.
  69  */
  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(0, NULL);
  86         if (!is_idle_task(current)) {
  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
 100 static 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 /* which CPU booted us (0xff = not set) */
 107 unsigned char boot_cpu_id = 0xff; /* 0xff will make it into DATA section... */
 108
 109 static void
 110 prom_console_write(struct console *con, const char *s, unsigned int n)
 111 {
 112         prom_write(s, n);
 113 }
 114
 115 static struct console prom_early_console = {
 116         .name =         "earlyprom",
 117         .write =        prom_console_write,
 118         .flags =        CON_PRINTBUFFER | CON_BOOT,
 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                 prom_early_console.flags &= ~CON_BOOT;
 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 == ' ')
 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 extern unsigned short root_flags;
 184 extern unsigned short root_dev;
 185 extern unsigned short ram_flags;
 186 #define RAMDISK_IMAGE_START_MASK        0x07FF
 187 #define RAMDISK_PROMPT_FLAG             0x8000
 188 #define RAMDISK_LOAD_FLAG               0x4000
 189
 190 extern int root_mountflags;
 191
 192 char reboot_command[COMMAND_LINE_SIZE];
 193
 194 struct cpuid_patch_entry {
 195         unsigned int    addr;
 196         unsigned int    sun4d[3];
 197         unsigned int    leon[3];
 198 };
 199 extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
 200
 201 static void __init per_cpu_patch(void)
 202 {
 203         struct cpuid_patch_entry *p;
 204
 205         if (sparc_cpu_model == sun4m) {
 206                 /* Nothing to do, this is what the unpatched code
 207                  * targets.
 208                  */
 209                 return;
 210         }
 211
 212         p = &__cpuid_patch;
 213         while (p < &__cpuid_patch_end) {
 214                 unsigned long addr = p->addr;
 215                 unsigned int *insns;
 216
 217                 switch (sparc_cpu_model) {
 218                 case sun4d:
 219                         insns = &p->sun4d[0];
 220                         break;
 221
 222                 case sparc_leon:
 223                         insns = &p->leon[0];
 224                         break;
 225                 default:
 226                         prom_printf("Unknown cpu type, halting.\n");
 227                         prom_halt();
 228                 }
 229                 *(unsigned int *) (addr + 0) = insns[0];
 230                 flushi(addr + 0);
 231                 *(unsigned int *) (addr + 4) = insns[1];
 232                 flushi(addr + 4);
 233                 *(unsigned int *) (addr + 8) = insns[2];
 234                 flushi(addr + 8);
 235
 236                 p++;
 237         }
 238 }
 239
 240 struct leon_1insn_patch_entry {
 241         unsigned int addr;
 242         unsigned int insn;
 243 };
 244
 245 enum sparc_cpu sparc_cpu_model;
 246 EXPORT_SYMBOL(sparc_cpu_model);
 247
 248 static __init void leon_patch(void)
 249 {
 250         struct leon_1insn_patch_entry *start = (void *)__leon_1insn_patch;
 251         struct leon_1insn_patch_entry *end = (void *)__leon_1insn_patch_end;
 252
 253         /* Default instruction is leon - no patching */
 254         if (sparc_cpu_model == sparc_leon)
 255                 return;
 256
 257         while (start < end) {
 258                 unsigned long addr = start->addr;
 259
 260                 *(unsigned int *)(addr) = start->insn;
 261                 flushi(addr);
 262
 263                 start++;
 264         }
 265 }
 266
 267 struct tt_entry *sparc_ttable;
 268 static struct pt_regs fake_swapper_regs;
 269
 270 /* Called from head_32.S - before we have setup anything
 271  * in the kernel. Be very careful with what you do here.
 272  */
 273 void __init sparc32_start_kernel(struct linux_romvec *rp)
 274 {
 275         prom_init(rp);
 276
 277         /* Set sparc_cpu_model */
 278         sparc_cpu_model = sun_unknown;
 279         if (!strcmp(&cputypval[0], "sun4m"))
 280                 sparc_cpu_model = sun4m;
 281         if (!strcmp(&cputypval[0], "sun4s"))
 282                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
 283         if (!strcmp(&cputypval[0], "sun4d"))
 284                 sparc_cpu_model = sun4d;
 285         if (!strcmp(&cputypval[0], "sun4e"))
 286                 sparc_cpu_model = sun4e;
 287         if (!strcmp(&cputypval[0], "sun4u"))
 288                 sparc_cpu_model = sun4u;
 289         if (!strncmp(&cputypval[0], "leon" , 4))
 290                 sparc_cpu_model = sparc_leon;
 291
 292         leon_patch();
 293         start_kernel();
 294 }
 295
 296 void __init setup_arch(char **cmdline_p)
 297 {
 298         int i;
 299         unsigned long highest_paddr;
 300
 301         sparc_ttable = &trapbase;
 302
 303         /* Initialize PROM console and command line. */
 304         *cmdline_p = prom_getbootargs();
 305         strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
 306         parse_early_param();
 307
 308         boot_flags_init(*cmdline_p);
 309
 310         register_console(&prom_early_console);
 311
 312         printk("ARCH: ");
 313         switch(sparc_cpu_model) {
 314         case sun4m:
 315                 printk("SUN4M\n");
 316                 break;
 317         case sun4d:
 318                 printk("SUN4D\n");
 319                 break;
 320         case sun4e:
 321                 printk("SUN4E\n");
 322                 break;
 323         case sun4u:
 324                 printk("SUN4U\n");
 325                 break;
 326         case sparc_leon:
 327                 printk("LEON\n");
 328                 break;
 329         default:
 330                 printk("UNKNOWN!\n");
 331                 break;
 332         }
 333
 334 #ifdef CONFIG_DUMMY_CONSOLE
 335         conswitchp = &dummy_con;
 336 #endif
 337
 338         idprom_init();
 339         load_mmu();
 340
 341         phys_base = 0xffffffffUL;
 342         highest_paddr = 0UL;
 343         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
 344                 unsigned long top;
 345
 346                 if (sp_banks[i].base_addr < phys_base)
 347                         phys_base = sp_banks[i].base_addr;
 348                 top = sp_banks[i].base_addr +
 349                         sp_banks[i].num_bytes;
 350                 if (highest_paddr < top)
 351                         highest_paddr = top;
 352         }
 353         pfn_base = phys_base >> PAGE_SHIFT;
 354
 355         if (!root_flags)
 356                 root_mountflags &= ~MS_RDONLY;
 357         ROOT_DEV = old_decode_dev(root_dev);
 358 #ifdef CONFIG_BLK_DEV_RAM
 359         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 360         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 361         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 362 #endif
 363
 364         prom_setsync(prom_sync_me);
 365
 366         if((boot_flags & BOOTME_DEBUG) && (linux_dbvec != NULL) &&
 367            ((*(short *)linux_dbvec) != -1)) {
 368                 printk("Booted under KADB. Syncing trap table.\n");
 369                 (*(linux_dbvec->teach_debugger))();
 370         }
 371
 372         init_task.thread.kregs = &fake_swapper_regs;
 373
 374         /* Run-time patch instructions to match the cpu model */
 375         per_cpu_patch();
 376
 377         paging_init();
 378
 379         smp_setup_cpu_possible_map();
 380 }
 381
 382 extern int stop_a_enabled;
 383
 384 void sun_do_break(void)
 385 {
 386         if (!stop_a_enabled)
 387                 return;
 388
 389         printk("\n");
 390         flush_user_windows();
 391
 392         prom_cmdline();
 393 }
 394 EXPORT_SYMBOL(sun_do_break);
 395
 396 int stop_a_enabled = 1;
 397
 398 static int __init topology_init(void)
 399 {
 400         int i, ncpus, err;
 401
 402         /* Count the number of physically present processors in
 403          * the machine, even on uniprocessor, so that /proc/cpuinfo
 404          * output is consistent with 2.4.x
 405          */
 406         ncpus = 0;
 407         while (!cpu_find_by_instance(ncpus, NULL, NULL))
 408                 ncpus++;
 409         ncpus_probed = ncpus;
 410
 411         err = 0;
 412         for_each_online_cpu(i) {
 413                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
 414                 if (!p)
 415                         err = -ENOMEM;
 416                 else
 417                         register_cpu(p, i);
 418         }
 419
 420         return err;
 421 }
 422
 423 subsys_initcall(topology_init);