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 472