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_each_online_cpu(i)
 166                         bogosum += loops_per_jiffy;
 167                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 168                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 169 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 170                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 171
 172                 if (ppc_md.show_cpuinfo != NULL)
 173                         ppc_md.show_cpuinfo(m);
 174
 175                 return 0;
 176         }
 177
 178         /* We only show online cpus: disable preempt (overzealous, I
 179          * knew) to prevent cpu going down. */
 180         preempt_disable();
 181         if (!cpu_online(cpu_id)) {
 182                 preempt_enable();
 183                 return 0;
 184         }
 185
 186 #ifdef CONFIG_SMP
 187         pvr = per_cpu(pvr, cpu_id);
 188 #else
 189         pvr = mfspr(SPRN_PVR);
 190 #endif
 191         maj = (pvr >> 8) & 0xFF;
 192         min = pvr & 0xFF;
 193
 194         seq_printf(m, "processor\t: %lu\n", cpu_id);
 195         seq_printf(m, "cpu\t\t: ");
 196
 197         if (cur_cpu_spec->pvr_mask)
 198                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 199         else
 200                 seq_printf(m, "unknown (%08x)", pvr);
 201
 202 #ifdef CONFIG_ALTIVEC
 203         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 204                 seq_printf(m, ", altivec supported");
 205 #endif /* CONFIG_ALTIVEC */
 206
 207         seq_printf(m, "\n");
 208
 209 #ifdef CONFIG_TAU
 210         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 211 #ifdef CONFIG_TAU_AVERAGE
 212                 /* more straightforward, but potentially misleading */
 213                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 214                            cpu_temp(cpu_id));
 215 #else
 216                 /* show the actual temp sensor range */
 217                 u32 temp;
 218                 temp = cpu_temp_both(cpu_id);
 219                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 220                            temp & 0xff, temp >> 16);
 221 #endif
 222         }
 223 #endif /* CONFIG_TAU */
 224
 225         /*
 226          * Assume here that all clock rates are the same in a
 227          * smp system.  -- Cort
 228          */
 229         if (ppc_proc_freq)
 230                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 231                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 232
 233         if (ppc_md.show_percpuinfo != NULL)
 234                 ppc_md.show_percpuinfo(m, cpu_id);
 235
 236         /* If we are a Freescale core do a simple check so
 237          * we dont have to keep adding cases in the future */
 238         if (PVR_VER(pvr) & 0x8000) {
 239                 maj = PVR_MAJ(pvr);
 240                 min = PVR_MIN(pvr);
 241         } else {
 242                 switch (PVR_VER(pvr)) {
 243                         case 0x0020:    /* 403 family */
 244                                 maj = PVR_MAJ(pvr) + 1;
 245                                 min = PVR_MIN(pvr);
 246                                 break;
 247                         case 0x1008:    /* 740P/750P ?? */
 248                                 maj = ((pvr >> 8) & 0xFF) - 1;
 249                                 min = pvr & 0xFF;
 250                                 break;
 251                         default:
 252                                 maj = (pvr >> 8) & 0xFF;
 253                                 min = pvr & 0xFF;
 254                                 break;
 255                 }
 256         }
 257
 258         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 259                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 260
 261 #ifdef CONFIG_PPC32
 262         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 263                    loops_per_jiffy / (500000/HZ),
 264                    (loops_per_jiffy / (5000/HZ)) % 100);
 265 #endif
 266
 267 #ifdef CONFIG_SMP
 268         seq_printf(m, "\n");
 269 #endif
 270
 271         preempt_enable();
 272         return 0;
 273 }
 274
 275 static void *c_start(struct seq_file *m, loff_t *pos)
 276 {
 277         unsigned long i = *pos;
 278
 279         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 280 }
 281
 282 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 283 {
 284         ++*pos;
 285         return c_start(m, pos);
 286 }
 287
 288 static void c_stop(struct seq_file *m, void *v)
 289 {
 290 }
 291
 292 struct seq_operations cpuinfo_op = {
 293         .start =c_start,
 294         .next = c_next,
 295         .stop = c_stop,
 296         .show = show_cpuinfo,
 297 };
 298
 299 void __init check_for_initrd(void)
 300 {
 301 #ifdef CONFIG_BLK_DEV_INITRD
 302         unsigned long *prop;
 303
 304         DBG(" -> check_for_initrd()\n");
 305
 306         if (of_chosen) {
 307                 prop = (unsigned long *)get_property(of_chosen,
 308                                 "linux,initrd-start", NULL);
 309                 if (prop != NULL) {
 310                         initrd_start = (unsigned long)__va(*prop);
 311                         prop = (unsigned long *)get_property(of_chosen,
 312                                         "linux,initrd-end", NULL);
 313                         if (prop != NULL) {
 314                                 initrd_end = (unsigned long)__va(*prop);
 315                                 initrd_below_start_ok = 1;
 316                         } else
 317                                 initrd_start = 0;
 318                 }
 319         }
 320
 321         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 322          * look sensible. If not, clear initrd reference.
 323          */
 324         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 325             initrd_end > initrd_start)
 326                 ROOT_DEV = Root_RAM0;
 327         else
 328                 initrd_start = initrd_end = 0;
 329
 330         if (initrd_start)
 331                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 332
 333         DBG(" <- check_for_initrd()\n");
 334 #endif /* CONFIG_BLK_DEV_INITRD */
 335 }
 336
 337 #ifdef CONFIG_SMP
 338
 339 /**
 340  * setup_cpu_maps - initialize the following cpu maps:
 341  *                  cpu_possible_map
 342  *                  cpu_present_map
 343  *                  cpu_sibling_map
 344  *
 345  * Having the possible map set up early allows us to restrict allocations
 346  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 347  *
 348  * We do not initialize the online map here; cpus set their own bits in
 349  * cpu_online_map as they come up.
 350  *
 351  * This function is valid only for Open Firmware systems.  finish_device_tree
 352  * must be called before using this.
 353  *
 354  * While we're here, we may as well set the "physical" cpu ids in the paca.
 355  */
 356 void __init smp_setup_cpu_maps(void)
 357 {
 358         struct device_node *dn = NULL;
 359         int cpu = 0;
 360         int swap_cpuid = 0;
 361
 362         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 363                 int *intserv;
 364                 int j, len = sizeof(u32), nthreads = 1;
 365
 366                 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
 367                                               &len);
 368                 if (intserv)
 369                         nthreads = len / sizeof(int);
 370                 else {
 371                         intserv = (int *) get_property(dn, "reg", NULL);
 372                         if (!intserv)
 373                                 intserv = &cpu; /* assume logical == phys */
 374                 }
 375
 376                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 377                         cpu_set(cpu, cpu_present_map);
 378                         set_hard_smp_processor_id(cpu, intserv[j]);
 379
 380                         if (intserv[j] == boot_cpuid_phys)
 381                                 swap_cpuid = cpu;
 382                         cpu_set(cpu, cpu_possible_map);
 383                         cpu++;
 384                 }
 385         }
 386
 387         /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
 388          * boot cpu is logical 0.
 389          */
 390         if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
 391                 u32 tmp;
 392                 tmp = get_hard_smp_processor_id(0);
 393                 set_hard_smp_processor_id(0, boot_cpuid_phys);
 394                 set_hard_smp_processor_id(swap_cpuid, tmp);
 395         }
 396
 397 #ifdef CONFIG_PPC64
 398         /*
 399          * On pSeries LPAR, we need to know how many cpus
 400          * could possibly be added to this partition.
 401          */
 402         if (_machine == PLATFORM_PSERIES_LPAR &&
 403             (dn = of_find_node_by_path("/rtas"))) {
 404                 int num_addr_cell, num_size_cell, maxcpus;
 405                 unsigned int *ireg;
 406
 407                 num_addr_cell = prom_n_addr_cells(dn);
 408                 num_size_cell = prom_n_size_cells(dn);
 409
 410                 ireg = (unsigned int *)
 411                         get_property(dn, "ibm,lrdr-capacity", NULL);
 412
 413                 if (!ireg)
 414                         goto out;
 415
 416                 maxcpus = ireg[num_addr_cell + num_size_cell];
 417
 418                 /* Double maxcpus for processors which have SMT capability */
 419                 if (cpu_has_feature(CPU_FTR_SMT))
 420                         maxcpus *= 2;
 421
 422                 if (maxcpus > NR_CPUS) {
 423                         printk(KERN_WARNING
 424                                "Partition configured for %d cpus, "
 425                                "operating system maximum is %d.\n",
 426                                maxcpus, NR_CPUS);
 427                         maxcpus = NR_CPUS;
 428                 } else
 429                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 430                                maxcpus);
 431
 432                 for (cpu = 0; cpu < maxcpus; cpu++)
 433                         cpu_set(cpu, cpu_possible_map);
 434         out:
 435                 of_node_put(dn);
 436         }
 437
 438         /*
 439          * Do the sibling map; assume only two threads per processor.
 440          */
 441         for_each_cpu(cpu) {
 442                 cpu_set(cpu, cpu_sibling_map[cpu]);
 443                 if (cpu_has_feature(CPU_FTR_SMT))
 444                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
 445         }
 446
 447         vdso_data->processorCount = num_present_cpus();
 448 #endif /* CONFIG_PPC64 */
 449 }
 450 #endif /* CONFIG_SMP */
 451
 452 #ifdef CONFIG_XMON
 453 static int __init early_xmon(char *p)
 454 {
 455         /* ensure xmon is enabled */
 456         if (p) {
 457                 if (strncmp(p, "on", 2) == 0)
 458                         xmon_init(1);
 459                 if (strncmp(p, "off", 3) == 0)
 460                         xmon_init(0);
 461                 if (strncmp(p, "early", 5) != 0)
 462                         return 0;
 463         }
 464         xmon_init(1);
 465         debugger(NULL);
 466
 467         return 0;
 468 }
 469 early_param("xmon", early_xmon);
 470 #endif