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   1 /*  $Id: setup.c,v 1.72 2002/02/09 19:49:30 davem Exp $
   2  *  linux/arch/sparc64/kernel/setup.c
   3  *
   4  *  Copyright (C) 1995,1996  David S. Miller (davem@caip.rutgers.edu)
   5  *  Copyright (C) 1997       Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   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 <asm/smp.h>
  17 #include <linux/user.h>
  18 #include <linux/screen_info.h>
  19 #include <linux/delay.h>
  20 #include <linux/fs.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/syscalls.h>
  23 #include <linux/kdev_t.h>
  24 #include <linux/major.h>
  25 #include <linux/string.h>
  26 #include <linux/init.h>
  27 #include <linux/inet.h>
  28 #include <linux/console.h>
  29 #include <linux/root_dev.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/cpu.h>
  32 #include <linux/initrd.h>
  33
  34 #include <asm/system.h>
  35 #include <asm/io.h>
  36 #include <asm/processor.h>
  37 #include <asm/oplib.h>
  38 #include <asm/page.h>
  39 #include <asm/pgtable.h>
  40 #include <asm/idprom.h>
  41 #include <asm/head.h>
  42 #include <asm/starfire.h>
  43 #include <asm/mmu_context.h>
  44 #include <asm/timer.h>
  45 #include <asm/sections.h>
  46 #include <asm/setup.h>
  47 #include <asm/mmu.h>
  48 #include <asm/ns87303.h>
  49
  50 #ifdef CONFIG_IP_PNP
  51 #include <net/ipconfig.h>
  52 #endif
  53
  54 #include "entry.h"
  55
  56 /* Used to synchronize accesses to NatSemi SUPER I/O chip configure
  57  * operations in asm/ns87303.h
  58  */
  59 DEFINE_SPINLOCK(ns87303_lock);
  60
  61 struct screen_info screen_info = {
  62         0, 0,                   /* orig-x, orig-y */
  63         0,                      /* unused */
  64         0,                      /* orig-video-page */
  65         0,                      /* orig-video-mode */
  66         128,                    /* orig-video-cols */
  67         0, 0, 0,                /* unused, ega_bx, unused */
  68         54,                     /* orig-video-lines */
  69         0,                      /* orig-video-isVGA */
  70         16                      /* orig-video-points */
  71 };
  72
  73 static void
  74 prom_console_write(struct console *con, const char *s, unsigned n)
  75 {
  76         prom_write(s, n);
  77 }
  78
  79 /* Exported for mm/init.c:paging_init. */
  80 unsigned long cmdline_memory_size = 0;
  81
  82 static struct console prom_early_console = {
  83         .name =         "earlyprom",
  84         .write =        prom_console_write,
  85         .flags =        CON_PRINTBUFFER | CON_BOOT,
  86         .index =        -1,
  87 };
  88
  89 /*
  90  * Process kernel command line switches that are specific to the
  91  * SPARC or that require special low-level processing.
  92  */
  93 static void __init process_switch(char c)
  94 {
  95         switch (c) {
  96         case 'd':
  97         case 's':
  98                 break;
  99         case 'h':
 100                 prom_printf("boot_flags_init: Halt!\n");
 101                 prom_halt();
 102                 break;
 103         case 'p':
 104                 /* Just ignore, this behavior is now the default.  */
 105                 break;
 106         case 'P':
 107                 /* Force UltraSPARC-III P-Cache on. */
 108                 if (tlb_type != cheetah) {
 109                         printk("BOOT: Ignoring P-Cache force option.\n");
 110                         break;
 111                 }
 112                 cheetah_pcache_forced_on = 1;
 113                 add_taint(TAINT_MACHINE_CHECK);
 114                 cheetah_enable_pcache();
 115                 break;
 116
 117         default:
 118                 printk("Unknown boot switch (-%c)\n", c);
 119                 break;
 120         }
 121 }
 122
 123 static void __init boot_flags_init(char *commands)
 124 {
 125         while (*commands) {
 126                 /* Move to the start of the next "argument". */
 127                 while (*commands && *commands == ' ')
 128                         commands++;
 129
 130                 /* Process any command switches, otherwise skip it. */
 131                 if (*commands == '\0')
 132                         break;
 133                 if (*commands == '-') {
 134                         commands++;
 135                         while (*commands && *commands != ' ')
 136                                 process_switch(*commands++);
 137                         continue;
 138                 }
 139                 if (!strncmp(commands, "mem=", 4)) {
 140                         /*
 141                          * "mem=XXX[kKmM]" overrides the PROM-reported
 142                          * memory size.
 143                          */
 144                         cmdline_memory_size = simple_strtoul(commands + 4,
 145                                                              &commands, 0);
 146                         if (*commands == 'K' || *commands == 'k') {
 147                                 cmdline_memory_size <<= 10;
 148                                 commands++;
 149                         } else if (*commands=='M' || *commands=='m') {
 150                                 cmdline_memory_size <<= 20;
 151                                 commands++;
 152                         }
 153                 }
 154                 while (*commands && *commands != ' ')
 155                         commands++;
 156         }
 157 }
 158
 159 extern unsigned short root_flags;
 160 extern unsigned short root_dev;
 161 extern unsigned short ram_flags;
 162 #define RAMDISK_IMAGE_START_MASK        0x07FF
 163 #define RAMDISK_PROMPT_FLAG             0x8000
 164 #define RAMDISK_LOAD_FLAG               0x4000
 165
 166 extern int root_mountflags;
 167
 168 char reboot_command[COMMAND_LINE_SIZE];
 169
 170 static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };
 171
 172 void __init per_cpu_patch(void)
 173 {
 174         struct cpuid_patch_entry *p;
 175         unsigned long ver;
 176         int is_jbus;
 177
 178         if (tlb_type == spitfire && !this_is_starfire)
 179                 return;
 180
 181         is_jbus = 0;
 182         if (tlb_type != hypervisor) {
 183                 __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 184                 is_jbus = ((ver >> 32UL) == __JALAPENO_ID ||
 185                            (ver >> 32UL) == __SERRANO_ID);
 186         }
 187
 188         p = &__cpuid_patch;
 189         while (p < &__cpuid_patch_end) {
 190                 unsigned long addr = p->addr;
 191                 unsigned int *insns;
 192
 193                 switch (tlb_type) {
 194                 case spitfire:
 195                         insns = &p->starfire[0];
 196                         break;
 197                 case cheetah:
 198                 case cheetah_plus:
 199                         if (is_jbus)
 200                                 insns = &p->cheetah_jbus[0];
 201                         else
 202                                 insns = &p->cheetah_safari[0];
 203                         break;
 204                 case hypervisor:
 205                         insns = &p->sun4v[0];
 206                         break;
 207                 default:
 208                         prom_printf("Unknown cpu type, halting.\n");
 209                         prom_halt();
 210                 };
 211
 212                 *(unsigned int *) (addr +  0) = insns[0];
 213                 wmb();
 214                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 215
 216                 *(unsigned int *) (addr +  4) = insns[1];
 217                 wmb();
 218                 __asm__ __volatile__("flush     %0" : : "r" (addr +  4));
 219
 220                 *(unsigned int *) (addr +  8) = insns[2];
 221                 wmb();
 222                 __asm__ __volatile__("flush     %0" : : "r" (addr +  8));
 223
 224                 *(unsigned int *) (addr + 12) = insns[3];
 225                 wmb();
 226                 __asm__ __volatile__("flush     %0" : : "r" (addr + 12));
 227
 228                 p++;
 229         }
 230 }
 231
 232 void __init sun4v_patch(void)
 233 {
 234         extern void sun4v_hvapi_init(void);
 235         struct sun4v_1insn_patch_entry *p1;
 236         struct sun4v_2insn_patch_entry *p2;
 237
 238         if (tlb_type != hypervisor)
 239                 return;
 240
 241         p1 = &__sun4v_1insn_patch;
 242         while (p1 < &__sun4v_1insn_patch_end) {
 243                 unsigned long addr = p1->addr;
 244
 245                 *(unsigned int *) (addr +  0) = p1->insn;
 246                 wmb();
 247                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 248
 249                 p1++;
 250         }
 251
 252         p2 = &__sun4v_2insn_patch;
 253         while (p2 < &__sun4v_2insn_patch_end) {
 254                 unsigned long addr = p2->addr;
 255
 256                 *(unsigned int *) (addr +  0) = p2->insns[0];
 257                 wmb();
 258                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 259
 260                 *(unsigned int *) (addr +  4) = p2->insns[1];
 261                 wmb();
 262                 __asm__ __volatile__("flush     %0" : : "r" (addr +  4));
 263
 264                 p2++;
 265         }
 266
 267         sun4v_hvapi_init();
 268 }
 269
 270 #ifdef CONFIG_SMP
 271 void __init boot_cpu_id_too_large(int cpu)
 272 {
 273         prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",
 274                     cpu, NR_CPUS);
 275         prom_halt();
 276 }
 277 #endif
 278
 279 void __init setup_arch(char **cmdline_p)
 280 {
 281         /* Initialize PROM console and command line. */
 282         *cmdline_p = prom_getbootargs();
 283         strcpy(boot_command_line, *cmdline_p);
 284
 285         boot_flags_init(*cmdline_p);
 286         register_console(&prom_early_console);
 287
 288         if (tlb_type == hypervisor)
 289                 printk("ARCH: SUN4V\n");
 290         else
 291                 printk("ARCH: SUN4U\n");
 292
 293 #ifdef CONFIG_DUMMY_CONSOLE
 294         conswitchp = &dummy_con;
 295 #elif defined(CONFIG_PROM_CONSOLE)
 296         conswitchp = &prom_con;
 297 #endif
 298
 299         idprom_init();
 300
 301         if (!root_flags)
 302                 root_mountflags &= ~MS_RDONLY;
 303         ROOT_DEV = old_decode_dev(root_dev);
 304 #ifdef CONFIG_BLK_DEV_RAM
 305         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 306         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 307         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 308 #endif
 309
 310         task_thread_info(&init_task)->kregs = &fake_swapper_regs;
 311
 312 #ifdef CONFIG_IP_PNP
 313         if (!ic_set_manually) {
 314                 int chosen = prom_finddevice ("/chosen");
 315                 u32 cl, sv, gw;
 316
 317                 cl = prom_getintdefault (chosen, "client-ip", 0);
 318                 sv = prom_getintdefault (chosen, "server-ip", 0);
 319                 gw = prom_getintdefault (chosen, "gateway-ip", 0);
 320                 if (cl && sv) {
 321                         ic_myaddr = cl;
 322                         ic_servaddr = sv;
 323                         if (gw)
 324                                 ic_gateway = gw;
 325 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
 326                         ic_proto_enabled = 0;
 327 #endif
 328                 }
 329         }
 330 #endif
 331
 332         /* Get boot processor trap_block[] setup.  */
 333         init_cur_cpu_trap(current_thread_info());
 334
 335         paging_init();
 336 }
 337
 338 /* BUFFER is PAGE_SIZE bytes long. */
 339
 340 extern void smp_info(struct seq_file *);
 341 extern void smp_bogo(struct seq_file *);
 342 extern void mmu_info(struct seq_file *);
 343
 344 unsigned int dcache_parity_tl1_occurred;
 345 unsigned int icache_parity_tl1_occurred;
 346
 347 int ncpus_probed;
 348
 349 static int show_cpuinfo(struct seq_file *m, void *__unused)
 350 {
 351         seq_printf(m,
 352                    "cpu\t\t: %s\n"
 353                    "fpu\t\t: %s\n"
 354                    "prom\t\t: %s\n"
 355                    "type\t\t: %s\n"
 356                    "ncpus probed\t: %d\n"
 357                    "ncpus active\t: %d\n"
 358                    "D$ parity tl1\t: %u\n"
 359                    "I$ parity tl1\t: %u\n"
 360 #ifndef CONFIG_SMP
 361                    "Cpu0ClkTck\t: %016lx\n"
 362 #endif
 363                    ,
 364                    sparc_cpu_type,
 365                    sparc_fpu_type,
 366                    prom_version,
 367                    ((tlb_type == hypervisor) ?
 368                     "sun4v" :
 369                     "sun4u"),
 370                    ncpus_probed,
 371                    num_online_cpus(),
 372                    dcache_parity_tl1_occurred,
 373                    icache_parity_tl1_occurred
 374 #ifndef CONFIG_SMP
 375                    , cpu_data(0).clock_tick
 376 #endif
 377                 );
 378 #ifdef CONFIG_SMP
 379         smp_bogo(m);
 380 #endif
 381         mmu_info(m);
 382 #ifdef CONFIG_SMP
 383         smp_info(m);
 384 #endif
 385         return 0;
 386 }
 387
 388 static void *c_start(struct seq_file *m, loff_t *pos)
 389 {
 390         /* The pointer we are returning is arbitrary,
 391          * it just has to be non-NULL and not IS_ERR
 392          * in the success case.
 393          */
 394         return *pos == 0 ? &c_start : NULL;
 395 }
 396
 397 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 398 {
 399         ++*pos;
 400         return c_start(m, pos);
 401 }
 402
 403 static void c_stop(struct seq_file *m, void *v)
 404 {
 405 }
 406
 407 const struct seq_operations cpuinfo_op = {
 408         .start =c_start,
 409         .next = c_next,
 410         .stop = c_stop,
 411         .show = show_cpuinfo,
 412 };
 413
 414 extern int stop_a_enabled;
 415
 416 void sun_do_break(void)
 417 {
 418         if (!stop_a_enabled)
 419                 return;
 420
 421         prom_printf("\n");
 422         flush_user_windows();
 423
 424         prom_cmdline();
 425 }
 426
 427 int stop_a_enabled = 1;