arch/powerpc/kernel/setup-common.c

   1 /*
   2  * Common boot and setup code for both 32-bit and 64-bit.
   3  * Extracted from arch/powerpc/kernel/setup_64.c.
   4  *
   5  * Copyright (C) 2001 PPC64 Team, IBM Corp
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12 #include <linux/config.h>
  13 #include <linux/module.h>
  14 #include <linux/string.h>
  15 #include <linux/sched.h>
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <linux/reboot.h>
  19 #include <linux/delay.h>
  20 #include <linux/initrd.h>
  21 #include <linux/ide.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/ioport.h>
  24 #include <linux/console.h>
  25 #include <linux/utsname.h>
  26 #include <linux/tty.h>
  27 #include <linux/root_dev.h>
  28 #include <linux/notifier.h>
  29 #include <linux/cpu.h>
  30 #include <linux/unistd.h>
  31 #include <linux/serial.h>
  32 #include <linux/serial_8250.h>
  33 #include <asm/io.h>
  34 #include <asm/prom.h>
  35 #include <asm/processor.h>
  36 #include <asm/vdso_datapage.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/smp.h>
  39 #include <asm/elf.h>
  40 #include <asm/machdep.h>
  41 #include <asm/time.h>
  42 #include <asm/cputable.h>
  43 #include <asm/sections.h>
  44 #include <asm/btext.h>
  45 #include <asm/nvram.h>
  46 #include <asm/setup.h>
  47 #include <asm/system.h>
  48 #include <asm/rtas.h>
  49 #include <asm/iommu.h>
  50 #include <asm/serial.h>
  51 #include <asm/cache.h>
  52 #include <asm/page.h>
  53 #include <asm/mmu.h>
  54 #include <asm/lmb.h>
  55 #include <asm/xmon.h>
  56
  57 #include "setup.h"
  58
  59 #undef DEBUG
  60
  61 #ifdef DEBUG
  62 #include <asm/udbg.h>
  63 #define DBG(fmt...) udbg_printf(fmt)
  64 #else
  65 #define DBG(fmt...)
  66 #endif
  67
  68 #ifdef CONFIG_PPC_MULTIPLATFORM
  69 int _machine = 0;
  70 EXPORT_SYMBOL(_machine);
  71 #endif
  72
  73 unsigned long klimit = (unsigned long) _end;
  74
  75 /*
  76  * This still seems to be needed... -- paulus
  77  */
  78 struct screen_info screen_info = {
  79         .orig_x = 0,
  80         .orig_y = 25,
  81         .orig_video_cols = 80,
  82         .orig_video_lines = 25,
  83         .orig_video_isVGA = 1,
  84         .orig_video_points = 16
  85 };
  86
  87 #ifdef __DO_IRQ_CANON
  88 /* XXX should go elsewhere eventually */
  89 int ppc_do_canonicalize_irqs;
  90 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  91 #endif
  92
  93 /* also used by kexec */
  94 void machine_shutdown(void)
  95 {
  96         if (ppc_md.machine_shutdown)
  97                 ppc_md.machine_shutdown();
  98 }
  99
 100 void machine_restart(char *cmd)
 101 {
 102         machine_shutdown();
 103         if (ppc_md.restart)
 104                 ppc_md.restart(cmd);
 105 #ifdef CONFIG_SMP
 106         smp_send_stop();
 107 #endif
 108         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 109         local_irq_disable();
 110         while (1) ;
 111 }
 112
 113 void machine_power_off(void)
 114 {
 115         machine_shutdown();
 116         if (ppc_md.power_off)
 117                 ppc_md.power_off();
 118 #ifdef CONFIG_SMP
 119         smp_send_stop();
 120 #endif
 121         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 122         local_irq_disable();
 123         while (1) ;
 124 }
 125 /* Used by the G5 thermal driver */
 126 EXPORT_SYMBOL_GPL(machine_power_off);
 127
 128 void (*pm_power_off)(void) = machine_power_off;
 129 EXPORT_SYMBOL_GPL(pm_power_off);
 130
 131 void machine_halt(void)
 132 {
 133         machine_shutdown();
 134         if (ppc_md.halt)
 135                 ppc_md.halt();
 136 #ifdef CONFIG_SMP
 137         smp_send_stop();
 138 #endif
 139         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 140         local_irq_disable();
 141         while (1) ;
 142 }
 143
 144
 145 #ifdef CONFIG_TAU
 146 extern u32 cpu_temp(unsigned long cpu);
 147 extern u32 cpu_temp_both(unsigned long cpu);
 148 #endif /* CONFIG_TAU */
 149
 150 #ifdef CONFIG_SMP
 151 DEFINE_PER_CPU(unsigned int, pvr);
 152 #endif
 153
 154 static int show_cpuinfo(struct seq_file *m, void *v)
 155 {
 156         unsigned long cpu_id = (unsigned long)v - 1;
 157         unsigned int pvr;
 158         unsigned short maj;
 159         unsigned short min;
 160
 161         if (cpu_id == NR_CPUS) {
 162 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 163                 unsigned long bogosum = 0;
 164                 int i;
 165                 for (i = 0; i < NR_CPUS; ++i)
 166                         if (cpu_online(i))
 167                                 bogosum += loops_per_jiffy;
 168                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 169                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 170 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 171                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 172
 173                 if (ppc_md.show_cpuinfo != NULL)
 174                         ppc_md.show_cpuinfo(m);
 175
 176                 return 0;
 177         }
 178
 179         /* We only show online cpus: disable preempt (overzealous, I
 180          * knew) to prevent cpu going down. */
 181         preempt_disable();
 182         if (!cpu_online(cpu_id)) {
 183                 preempt_enable();
 184                 return 0;
 185         }
 186
 187 #ifdef CONFIG_SMP
 188         pvr = per_cpu(pvr, cpu_id);
 189 #else
 190         pvr = mfspr(SPRN_PVR);
 191 #endif
 192         maj = (pvr >> 8) & 0xFF;
 193         min = pvr & 0xFF;
 194
 195         seq_printf(m, "processor\t: %lu\n", cpu_id);
 196         seq_printf(m, "cpu\t\t: ");
 197
 198         if (cur_cpu_spec->pvr_mask)
 199                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 200         else
 201                 seq_printf(m, "unknown (%08x)", pvr);
 202
 203 #ifdef CONFIG_ALTIVEC
 204         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 205                 seq_printf(m, ", altivec supported");
 206 #endif /* CONFIG_ALTIVEC */
 207
 208         seq_printf(m, "\n");
 209
 210 #ifdef CONFIG_TAU
 211         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 212 #ifdef CONFIG_TAU_AVERAGE
 213                 /* more straightforward, but potentially misleading */
 214                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 215                            cpu_temp(cpu_id));
 216 #else
 217                 /* show the actual temp sensor range */
 218                 u32 temp;
 219                 temp = cpu_temp_both(cpu_id);
 220                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 221                            temp & 0xff, temp >> 16);
 222 #endif
 223         }
 224 #endif /* CONFIG_TAU */
 225
 226         /*
 227          * Assume here that all clock rates are the same in a
 228          * smp system.  -- Cort
 229          */
 230         if (ppc_proc_freq)
 231                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 232                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 233
 234         if (ppc_md.show_percpuinfo != NULL)
 235                 ppc_md.show_percpuinfo(m, cpu_id);
 236
 237         /* If we are a Freescale core do a simple check so
 238          * we dont have to keep adding cases in the future */
 239         if (PVR_VER(pvr) & 0x8000) {
 240                 maj = PVR_MAJ(pvr);
 241                 min = PVR_MIN(pvr);
 242         } else {
 243                 switch (PVR_VER(pvr)) {
 244                         case 0x0020:    /* 403 family */
 245                                 maj = PVR_MAJ(pvr) + 1;
 246                                 min = PVR_MIN(pvr);
 247                                 break;
 248                         case 0x1008:    /* 740P/750P ?? */
 249                                 maj = ((pvr >> 8) & 0xFF) - 1;
 250                                 min = pvr & 0xFF;
 251                                 break;
 252                         default:
 253                                 maj = (pvr >> 8) & 0xFF;
 254                                 min = pvr & 0xFF;
 255                                 break;
 256                 }
 257         }
 258
 259         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 260                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 261
 262 #ifdef CONFIG_PPC32
 263         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 264                    loops_per_jiffy / (500000/HZ),
 265                    (loops_per_jiffy / (5000/HZ)) % 100);
 266 #endif
 267
 268 #ifdef CONFIG_SMP
 269         seq_printf(m, "\n");
 270 #endif
 271
 272         preempt_enable();
 273         return 0;
 274 }
 275
 276 static void *c_start(struct seq_file *m, loff_t *pos)
 277 {
 278         unsigned long i = *pos;
 279
 280         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 281 }
 282
 283 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 284 {
 285         ++*pos;
 286         return c_start(m, pos);
 287 }
 288
 289 static void c_stop(struct seq_file *m, void *v)
 290 {
 291 }
 292
 293 struct seq_operations cpuinfo_op = {
 294         .start =c_start,
 295         .next = c_next,
 296         .stop = c_stop,
 297         .show = show_cpuinfo,
 298 };
 299
 300 void __init check_for_initrd(void)
 301 {
 302 #ifdef CONFIG_BLK_DEV_INITRD
 303         unsigned long *prop;
 304
 305         DBG(" -> check_for_initrd()\n");
 306
 307         if (of_chosen) {
 308                 prop = (unsigned long *)get_property(of_chosen,
 309                                 "linux,initrd-start", NULL);
 310                 if (prop != NULL) {
 311                         initrd_start = (unsigned long)__va(*prop);
 312                         prop = (unsigned long *)get_property(of_chosen,
 313                                         "linux,initrd-end", NULL);
 314                         if (prop != NULL) {
 315                                 initrd_end = (unsigned long)__va(*prop);
 316                                 initrd_below_start_ok = 1;
 317                         } else
 318                                 initrd_start = 0;
 319                 }
 320         }
 321
 322         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 323          * look sensible. If not, clear initrd reference.
 324          */
 325         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 326             initrd_end > initrd_start)
 327                 ROOT_DEV = Root_RAM0;
 328         else
 329                 initrd_start = initrd_end = 0;
 330
 331         if (initrd_start)
 332                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 333
 334         DBG(" <- check_for_initrd()\n");
 335 #endif /* CONFIG_BLK_DEV_INITRD */
 336 }
 337
 338 #ifdef CONFIG_SMP
 339
 340 /**
 341  * setup_cpu_maps - initialize the following cpu maps:
 342  *                  cpu_possible_map
 343  *                  cpu_present_map
 344  *                  cpu_sibling_map
 345  *
 346  * Having the possible map set up early allows us to restrict allocations
 347  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 348  *
 349  * We do not initialize the online map here; cpus set their own bits in
 350  * cpu_online_map as they come up.
 351  *
 352  * This function is valid only for Open Firmware systems.  finish_device_tree
 353  * must be called before using this.
 354  *
 355  * While we're here, we may as well set the "physical" cpu ids in the paca.
 356  */
 357 void __init smp_setup_cpu_maps(void)
 358 {
 359         struct device_node *dn = NULL;
 360         int cpu = 0;
 361         int swap_cpuid = 0;
 362
 363         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 364                 int *intserv;
 365                 int j, len = sizeof(u32), nthreads = 1;
 366
 367                 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
 368                                               &len);
 369                 if (intserv)
 370                         nthreads = len / sizeof(int);
 371                 else {
 372                         intserv = (int *) get_property(dn, "reg", NULL);
 373                         if (!intserv)
 374                                 intserv = &cpu; /* assume logical == phys */
 375                 }
 376
 377                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 378                         cpu_set(cpu, cpu_present_map);
 379                         set_hard_smp_processor_id(cpu, intserv[j]);
 380
 381                         if (intserv[j] == boot_cpuid_phys)
 382                                 swap_cpuid = cpu;
 383                         cpu_set(cpu, cpu_possible_map);
 384                         cpu++;
 385                 }
 386         }
 387
 388         /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
 389          * boot cpu is logical 0.
 390          */
 391         if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
 392                 u32 tmp;
 393                 tmp = get_hard_smp_processor_id(0);
 394                 set_hard_smp_processor_id(0, boot_cpuid_phys);
 395                 set_hard_smp_processor_id(swap_cpuid, tmp);
 396         }
 397
 398 #ifdef CONFIG_PPC64
 399         /*
 400          * On pSeries LPAR, we need to know how many cpus
 401          * could possibly be added to this partition.
 402          */
 403         if (_machine == PLATFORM_PSERIES_LPAR &&
 404             (dn = of_find_node_by_path("/rtas"))) {
 405                 int num_addr_cell, num_size_cell, maxcpus;
 406                 unsigned int *ireg;
 407
 408                 num_addr_cell = prom_n_addr_cells(dn);
 409                 num_size_cell = prom_n_size_cells(dn);
 410
 411                 ireg = (unsigned int *)
 412                         get_property(dn, "ibm,lrdr-capacity", NULL);
 413
 414                 if (!ireg)
 415                         goto out;
 416
 417                 maxcpus = ireg[num_addr_cell + num_size_cell];
 418
 419                 /* Double maxcpus for processors which have SMT capability */
 420                 if (cpu_has_feature(CPU_FTR_SMT))
 421                         maxcpus *= 2;
 422
 423                 if (maxcpus > NR_CPUS) {
 424                         printk(KERN_WARNING
 425                                "Partition configured for %d cpus, "
 426                                "operating system maximum is %d.\n",
 427                                maxcpus, NR_CPUS);
 428                         maxcpus = NR_CPUS;
 429                 } else
 430                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 431                                maxcpus);
 432
 433                 for (cpu = 0; cpu < maxcpus; cpu++)
 434                         cpu_set(cpu, cpu_possible_map);
 435         out:
 436                 of_node_put(dn);
 437         }
 438
 439         /*
 440          * Do the sibling map; assume only two threads per processor.
 441          */
 442         for_each_cpu(cpu) {
 443                 cpu_set(cpu, cpu_sibling_map[cpu]);
 444                 if (cpu_has_feature(CPU_FTR_SMT))
 445                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
 446         }
 447
 448         vdso_data->processorCount = num_present_cpus();
 449 #endif /* CONFIG_PPC64 */
 450 }
 451 #endif /* CONFIG_SMP */
 452
 453 #ifdef CONFIG_XMON
 454 static int __init early_xmon(char *p)
 455 {
 456         /* ensure xmon is enabled */
 457         if (p) {
 458                 if (strncmp(p, "on", 2) == 0)
 459                         xmon_init(1);
 460                 if (strncmp(p, "off", 3) == 0)
 461                         xmon_init(0);
 462                 if (strncmp(p, "early", 5) != 0)
 463                         return 0;
 464         }
 465         xmon_init(1);
 466         debugger(NULL);
 467
 468         return 0;
 469 }
 470 early_param("xmon", early_xmon);
 471 #endif