arch/sparc/kernel/setup_64.c

   1 /*
   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 #include "kernel.h"
  56
  57 /* Used to synchronize accesses to NatSemi SUPER I/O chip configure
  58  * operations in asm/ns87303.h
  59  */
  60 DEFINE_SPINLOCK(ns87303_lock);
  61
  62 struct screen_info screen_info = {
  63         0, 0,                   /* orig-x, orig-y */
  64         0,                      /* unused */
  65         0,                      /* orig-video-page */
  66         0,                      /* orig-video-mode */
  67         128,                    /* orig-video-cols */
  68         0, 0, 0,                /* unused, ega_bx, unused */
  69         54,                     /* orig-video-lines */
  70         0,                      /* orig-video-isVGA */
  71         16                      /* orig-video-points */
  72 };
  73
  74 static void
  75 prom_console_write(struct console *con, const char *s, unsigned n)
  76 {
  77         prom_write(s, n);
  78 }
  79
  80 /* Exported for mm/init.c:paging_init. */
  81 unsigned long cmdline_memory_size = 0;
  82
  83 static struct console prom_early_console = {
  84         .name =         "earlyprom",
  85         .write =        prom_console_write,
  86         .flags =        CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
  87         .index =        -1,
  88 };
  89
  90 /*
  91  * Process kernel command line switches that are specific to the
  92  * SPARC or that require special low-level processing.
  93  */
  94 static void __init process_switch(char c)
  95 {
  96         switch (c) {
  97         case 'd':
  98         case 's':
  99                 break;
 100         case 'h':
 101                 prom_printf("boot_flags_init: Halt!\n");
 102                 prom_halt();
 103                 break;
 104         case 'p':
 105                 /* Just ignore, this behavior is now the default.  */
 106                 break;
 107         case 'P':
 108                 /* Force UltraSPARC-III P-Cache on. */
 109                 if (tlb_type != cheetah) {
 110                         printk("BOOT: Ignoring P-Cache force option.\n");
 111                         break;
 112                 }
 113                 cheetah_pcache_forced_on = 1;
 114                 add_taint(TAINT_MACHINE_CHECK);
 115                 cheetah_enable_pcache();
 116                 break;
 117
 118         default:
 119                 printk("Unknown boot switch (-%c)\n", c);
 120                 break;
 121         }
 122 }
 123
 124 static void __init boot_flags_init(char *commands)
 125 {
 126         while (*commands) {
 127                 /* Move to the start of the next "argument". */
 128                 while (*commands && *commands == ' ')
 129                         commands++;
 130
 131                 /* Process any command switches, otherwise skip it. */
 132                 if (*commands == '\0')
 133                         break;
 134                 if (*commands == '-') {
 135                         commands++;
 136                         while (*commands && *commands != ' ')
 137                                 process_switch(*commands++);
 138                         continue;
 139                 }
 140                 if (!strncmp(commands, "mem=", 4)) {
 141                         /*
 142                          * "mem=XXX[kKmM]" overrides the PROM-reported
 143                          * memory size.
 144                          */
 145                         cmdline_memory_size = simple_strtoul(commands + 4,
 146                                                              &commands, 0);
 147                         if (*commands == 'K' || *commands == 'k') {
 148                                 cmdline_memory_size <<= 10;
 149                                 commands++;
 150                         } else if (*commands=='M' || *commands=='m') {
 151                                 cmdline_memory_size <<= 20;
 152                                 commands++;
 153                         }
 154                 }
 155                 while (*commands && *commands != ' ')
 156                         commands++;
 157         }
 158 }
 159
 160 extern unsigned short root_flags;
 161 extern unsigned short root_dev;
 162 extern unsigned short ram_flags;
 163 #define RAMDISK_IMAGE_START_MASK        0x07FF
 164 #define RAMDISK_PROMPT_FLAG             0x8000
 165 #define RAMDISK_LOAD_FLAG               0x4000
 166
 167 extern int root_mountflags;
 168
 169 char reboot_command[COMMAND_LINE_SIZE];
 170
 171 static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };
 172
 173 void __init per_cpu_patch(void)
 174 {
 175         struct cpuid_patch_entry *p;
 176         unsigned long ver;
 177         int is_jbus;
 178
 179         if (tlb_type == spitfire && !this_is_starfire)
 180                 return;
 181
 182         is_jbus = 0;
 183         if (tlb_type != hypervisor) {
 184                 __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 185                 is_jbus = ((ver >> 32UL) == __JALAPENO_ID ||
 186                            (ver >> 32UL) == __SERRANO_ID);
 187         }
 188
 189         p = &__cpuid_patch;
 190         while (p < &__cpuid_patch_end) {
 191                 unsigned long addr = p->addr;
 192                 unsigned int *insns;
 193
 194                 switch (tlb_type) {
 195                 case spitfire:
 196                         insns = &p->starfire[0];
 197                         break;
 198                 case cheetah:
 199                 case cheetah_plus:
 200                         if (is_jbus)
 201                                 insns = &p->cheetah_jbus[0];
 202                         else
 203                                 insns = &p->cheetah_safari[0];
 204                         break;
 205                 case hypervisor:
 206                         insns = &p->sun4v[0];
 207                         break;
 208                 default:
 209                         prom_printf("Unknown cpu type, halting.\n");
 210                         prom_halt();
 211                 };
 212
 213                 *(unsigned int *) (addr +  0) = insns[0];
 214                 wmb();
 215                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 216
 217                 *(unsigned int *) (addr +  4) = insns[1];
 218                 wmb();
 219                 __asm__ __volatile__("flush     %0" : : "r" (addr +  4));
 220
 221                 *(unsigned int *) (addr +  8) = insns[2];
 222                 wmb();
 223                 __asm__ __volatile__("flush     %0" : : "r" (addr +  8));
 224
 225                 *(unsigned int *) (addr + 12) = insns[3];
 226                 wmb();
 227                 __asm__ __volatile__("flush     %0" : : "r" (addr + 12));
 228
 229                 p++;
 230         }
 231 }
 232
 233 void __init sun4v_patch(void)
 234 {
 235         extern void sun4v_hvapi_init(void);
 236         struct sun4v_1insn_patch_entry *p1;
 237         struct sun4v_2insn_patch_entry *p2;
 238
 239         if (tlb_type != hypervisor)
 240                 return;
 241
 242         p1 = &__sun4v_1insn_patch;
 243         while (p1 < &__sun4v_1insn_patch_end) {
 244                 unsigned long addr = p1->addr;
 245
 246                 *(unsigned int *) (addr +  0) = p1->insn;
 247                 wmb();
 248                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 249
 250                 p1++;
 251         }
 252
 253         p2 = &__sun4v_2insn_patch;
 254         while (p2 < &__sun4v_2insn_patch_end) {
 255                 unsigned long addr = p2->addr;
 256
 257                 *(unsigned int *) (addr +  0) = p2->insns[0];
 258                 wmb();
 259                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 260
 261                 *(unsigned int *) (addr +  4) = p2->insns[1];
 262                 wmb();
 263                 __asm__ __volatile__("flush     %0" : : "r" (addr +  4));
 264
 265                 p2++;
 266         }
 267
 268         sun4v_hvapi_init();
 269 }
 270
 271 #ifdef CONFIG_SMP
 272 void __init boot_cpu_id_too_large(int cpu)
 273 {
 274         prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",
 275                     cpu, NR_CPUS);
 276         prom_halt();
 277 }
 278 #endif
 279
 280 void __init setup_arch(char **cmdline_p)
 281 {
 282         /* Initialize PROM console and command line. */
 283         *cmdline_p = prom_getbootargs();
 284         strcpy(boot_command_line, *cmdline_p);
 285         parse_early_param();
 286
 287         boot_flags_init(*cmdline_p);
 288         register_console(&prom_early_console);
 289
 290         if (tlb_type == hypervisor)
 291                 printk("ARCH: SUN4V\n");
 292         else
 293                 printk("ARCH: SUN4U\n");
 294
 295 #ifdef CONFIG_DUMMY_CONSOLE
 296         conswitchp = &dummy_con;
 297 #elif defined(CONFIG_PROM_CONSOLE)
 298         conswitchp = &prom_con;
 299 #endif
 300
 301         idprom_init();
 302
 303         if (!root_flags)
 304                 root_mountflags &= ~MS_RDONLY;
 305         ROOT_DEV = old_decode_dev(root_dev);
 306 #ifdef CONFIG_BLK_DEV_RAM
 307         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 308         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
 309         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
 310 #endif
 311
 312         task_thread_info(&init_task)->kregs = &fake_swapper_regs;
 313
 314 #ifdef CONFIG_IP_PNP
 315         if (!ic_set_manually) {
 316                 int chosen = prom_finddevice ("/chosen");
 317                 u32 cl, sv, gw;
 318
 319                 cl = prom_getintdefault (chosen, "client-ip", 0);
 320                 sv = prom_getintdefault (chosen, "server-ip", 0);
 321                 gw = prom_getintdefault (chosen, "gateway-ip", 0);
 322                 if (cl && sv) {
 323                         ic_myaddr = cl;
 324                         ic_servaddr = sv;
 325                         if (gw)
 326                                 ic_gateway = gw;
 327 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
 328                         ic_proto_enabled = 0;
 329 #endif
 330                 }
 331         }
 332 #endif
 333
 334         /* Get boot processor trap_block[] setup.  */
 335         init_cur_cpu_trap(current_thread_info());
 336
 337         paging_init();
 338 }
 339
 340 /* BUFFER is PAGE_SIZE bytes long. */
 341
 342 extern void smp_info(struct seq_file *);
 343 extern void smp_bogo(struct seq_file *);
 344 extern void mmu_info(struct seq_file *);
 345
 346 unsigned int dcache_parity_tl1_occurred;
 347 unsigned int icache_parity_tl1_occurred;
 348
 349 int ncpus_probed;
 350
 351 static int show_cpuinfo(struct seq_file *m, void *__unused)
 352 {
 353         seq_printf(m,
 354                    "cpu\t\t: %s\n"
 355                    "fpu\t\t: %s\n"
 356                    "prom\t\t: %s\n"
 357                    "type\t\t: %s\n"
 358                    "ncpus probed\t: %d\n"
 359                    "ncpus active\t: %d\n"
 360                    "D$ parity tl1\t: %u\n"
 361                    "I$ parity tl1\t: %u\n"
 362 #ifndef CONFIG_SMP
 363                    "Cpu0ClkTck\t: %016lx\n"
 364 #endif
 365                    ,
 366                    sparc_cpu_type,
 367                    sparc_fpu_type,
 368                    prom_version,
 369                    ((tlb_type == hypervisor) ?
 370                     "sun4v" :
 371                     "sun4u"),
 372                    ncpus_probed,
 373                    num_online_cpus(),
 374                    dcache_parity_tl1_occurred,
 375                    icache_parity_tl1_occurred
 376 #ifndef CONFIG_SMP
 377                    , cpu_data(0).clock_tick
 378 #endif
 379                 );
 380 #ifdef CONFIG_SMP
 381         smp_bogo(m);
 382 #endif
 383         mmu_info(m);
 384 #ifdef CONFIG_SMP
 385         smp_info(m);
 386 #endif
 387         return 0;
 388 }
 389
 390 static void *c_start(struct seq_file *m, loff_t *pos)
 391 {
 392         /* The pointer we are returning is arbitrary,
 393          * it just has to be non-NULL and not IS_ERR
 394          * in the success case.
 395          */
 396         return *pos == 0 ? &c_start : NULL;
 397 }
 398
 399 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 400 {
 401         ++*pos;
 402         return c_start(m, pos);
 403 }
 404
 405 static void c_stop(struct seq_file *m, void *v)
 406 {
 407 }
 408
 409 const struct seq_operations cpuinfo_op = {
 410         .start =c_start,
 411         .next = c_next,
 412         .stop = c_stop,
 413         .show = show_cpuinfo,
 414 };
 415
 416 extern int stop_a_enabled;
 417
 418 void sun_do_break(void)
 419 {
 420         if (!stop_a_enabled)
 421                 return;
 422
 423         prom_printf("\n");
 424         flush_user_windows();
 425
 426         prom_cmdline();
 427 }
 428
 429 int stop_a_enabled = 1;