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 ppc_md.restart(cmd); 104 #ifdef CONFIG_SMP 105 smp_send_stop(); 106 #endif 107 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 108 local_irq_disable(); 109 while (1) ; 110 } 111 112 void machine_power_off(void) 113 { 114 machine_shutdown(); 115 ppc_md.power_off(); 116 #ifdef CONFIG_SMP 117 smp_send_stop(); 118 #endif 119 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 120 local_irq_disable(); 121 while (1) ; 122 } 123 /* Used by the G5 thermal driver */ 124 EXPORT_SYMBOL_GPL(machine_power_off); 125 126 void (*pm_power_off)(void) = machine_power_off; 127 EXPORT_SYMBOL_GPL(pm_power_off); 128 129 void machine_halt(void) 130 { 131 machine_shutdown(); 132 ppc_md.halt(); 133 #ifdef CONFIG_SMP 134 smp_send_stop(); 135 #endif 136 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 137 local_irq_disable(); 138 while (1) ; 139 } 140 141 142 #ifdef CONFIG_TAU 143 extern u32 cpu_temp(unsigned long cpu); 144 extern u32 cpu_temp_both(unsigned long cpu); 145 #endif /* CONFIG_TAU */ 146 147 #ifdef CONFIG_SMP 148 DEFINE_PER_CPU(unsigned int, pvr); 149 #endif 150 151 static int show_cpuinfo(struct seq_file *m, void *v) 152 { 153 unsigned long cpu_id = (unsigned long)v - 1; 154 unsigned int pvr; 155 unsigned short maj; 156 unsigned short min; 157 158 if (cpu_id == NR_CPUS) { 159 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32) 160 unsigned long bogosum = 0; 161 int i; 162 for (i = 0; i < NR_CPUS; ++i) 163 if (cpu_online(i)) 164 bogosum += loops_per_jiffy; 165 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 166 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100); 167 #endif /* CONFIG_SMP && CONFIG_PPC32 */ 168 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 169 170 if (ppc_md.show_cpuinfo != NULL) 171 ppc_md.show_cpuinfo(m); 172 173 return 0; 174 } 175 176 /* We only show online cpus: disable preempt (overzealous, I 177 * knew) to prevent cpu going down. */ 178 preempt_disable(); 179 if (!cpu_online(cpu_id)) { 180 preempt_enable(); 181 return 0; 182 } 183 184 #ifdef CONFIG_SMP 185 pvr = per_cpu(pvr, cpu_id); 186 #else 187 pvr = mfspr(SPRN_PVR); 188 #endif 189 maj = (pvr >> 8) & 0xFF; 190 min = pvr & 0xFF; 191 192 seq_printf(m, "processor\t: %lu\n", cpu_id); 193 seq_printf(m, "cpu\t\t: "); 194 195 if (cur_cpu_spec->pvr_mask) 196 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 197 else 198 seq_printf(m, "unknown (%08x)", pvr); 199 200 #ifdef CONFIG_ALTIVEC 201 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 202 seq_printf(m, ", altivec supported"); 203 #endif /* CONFIG_ALTIVEC */ 204 205 seq_printf(m, "\n"); 206 207 #ifdef CONFIG_TAU 208 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) { 209 #ifdef CONFIG_TAU_AVERAGE 210 /* more straightforward, but potentially misleading */ 211 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 212 cpu_temp(cpu_id)); 213 #else 214 /* show the actual temp sensor range */ 215 u32 temp; 216 temp = cpu_temp_both(cpu_id); 217 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 218 temp & 0xff, temp >> 16); 219 #endif 220 } 221 #endif /* CONFIG_TAU */ 222 223 /* 224 * Assume here that all clock rates are the same in a 225 * smp system. -- Cort 226 */ 227 if (ppc_proc_freq) 228 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 229 ppc_proc_freq / 1000000, ppc_proc_freq % 1000000); 230 231 if (ppc_md.show_percpuinfo != NULL) 232 ppc_md.show_percpuinfo(m, cpu_id); 233 234 /* If we are a Freescale core do a simple check so 235 * we dont have to keep adding cases in the future */ 236 if (PVR_VER(pvr) & 0x8000) { 237 maj = PVR_MAJ(pvr); 238 min = PVR_MIN(pvr); 239 } else { 240 switch (PVR_VER(pvr)) { 241 case 0x0020: /* 403 family */ 242 maj = PVR_MAJ(pvr) + 1; 243 min = PVR_MIN(pvr); 244 break; 245 case 0x1008: /* 740P/750P ?? */ 246 maj = ((pvr >> 8) & 0xFF) - 1; 247 min = pvr & 0xFF; 248 break; 249 default: 250 maj = (pvr >> 8) & 0xFF; 251 min = pvr & 0xFF; 252 break; 253 } 254 } 255 256 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 257 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 258 259 #ifdef CONFIG_PPC32 260 seq_printf(m, "bogomips\t: %lu.%02lu\n", 261 loops_per_jiffy / (500000/HZ), 262 (loops_per_jiffy / (5000/HZ)) % 100); 263 #endif 264 265 #ifdef CONFIG_SMP 266 seq_printf(m, "\n"); 267 #endif 268 269 preempt_enable(); 270 return 0; 271 } 272 273 static void *c_start(struct seq_file *m, loff_t *pos) 274 { 275 unsigned long i = *pos; 276 277 return i <= NR_CPUS ? (void *)(i + 1) : NULL; 278 } 279 280 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 281 { 282 ++*pos; 283 return c_start(m, pos); 284 } 285 286 static void c_stop(struct seq_file *m, void *v) 287 { 288 } 289 290 struct seq_operations cpuinfo_op = { 291 .start =c_start, 292 .next = c_next, 293 .stop = c_stop, 294 .show = show_cpuinfo, 295 }; 296 297 void __init check_for_initrd(void) 298 { 299 #ifdef CONFIG_BLK_DEV_INITRD 300 unsigned long *prop; 301 302 DBG(" -> check_for_initrd()\n"); 303 304 if (of_chosen) { 305 prop = (unsigned long *)get_property(of_chosen, 306 "linux,initrd-start", NULL); 307 if (prop != NULL) { 308 initrd_start = (unsigned long)__va(*prop); 309 prop = (unsigned long *)get_property(of_chosen, 310 "linux,initrd-end", NULL); 311 if (prop != NULL) { 312 initrd_end = (unsigned long)__va(*prop); 313 initrd_below_start_ok = 1; 314 } else 315 initrd_start = 0; 316 } 317 } 318 319 /* If we were passed an initrd, set the ROOT_DEV properly if the values 320 * look sensible. If not, clear initrd reference. 321 */ 322 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 323 initrd_end > initrd_start) 324 ROOT_DEV = Root_RAM0; 325 else 326 initrd_start = initrd_end = 0; 327 328 if (initrd_start) 329 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 330 331 DBG(" <- check_for_initrd()\n"); 332 #endif /* CONFIG_BLK_DEV_INITRD */ 333 } 334 335 #ifdef CONFIG_SMP 336 337 /** 338 * setup_cpu_maps - initialize the following cpu maps: 339 * cpu_possible_map 340 * cpu_present_map 341 * cpu_sibling_map 342 * 343 * Having the possible map set up early allows us to restrict allocations 344 * of things like irqstacks to num_possible_cpus() rather than NR_CPUS. 345 * 346 * We do not initialize the online map here; cpus set their own bits in 347 * cpu_online_map as they come up. 348 * 349 * This function is valid only for Open Firmware systems. finish_device_tree 350 * must be called before using this. 351 * 352 * While we're here, we may as well set the "physical" cpu ids in the paca. 353 */ 354 void __init smp_setup_cpu_maps(void) 355 { 356 struct device_node *dn = NULL; 357 int cpu = 0; 358 int swap_cpuid = 0; 359 360 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) { 361 int *intserv; 362 int j, len = sizeof(u32), nthreads = 1; 363 364 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s", 365 &len); 366 if (intserv) 367 nthreads = len / sizeof(int); 368 else { 369 intserv = (int *) get_property(dn, "reg", NULL); 370 if (!intserv) 371 intserv = &cpu; /* assume logical == phys */ 372 } 373 374 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) { 375 cpu_set(cpu, cpu_present_map); 376 set_hard_smp_processor_id(cpu, intserv[j]); 377 378 if (intserv[j] == boot_cpuid_phys) 379 swap_cpuid = cpu; 380 cpu_set(cpu, cpu_possible_map); 381 cpu++; 382 } 383 } 384 385 /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that 386 * boot cpu is logical 0. 387 */ 388 if (boot_cpuid_phys != get_hard_smp_processor_id(0)) { 389 u32 tmp; 390 tmp = get_hard_smp_processor_id(0); 391 set_hard_smp_processor_id(0, boot_cpuid_phys); 392 set_hard_smp_processor_id(swap_cpuid, tmp); 393 } 394 395 #ifdef CONFIG_PPC64 396 /* 397 * On pSeries LPAR, we need to know how many cpus 398 * could possibly be added to this partition. 399 */ 400 if (_machine == PLATFORM_PSERIES_LPAR && 401 (dn = of_find_node_by_path("/rtas"))) { 402 int num_addr_cell, num_size_cell, maxcpus; 403 unsigned int *ireg; 404 405 num_addr_cell = prom_n_addr_cells(dn); 406 num_size_cell = prom_n_size_cells(dn); 407 408 ireg = (unsigned int *) 409 get_property(dn, "ibm,lrdr-capacity", NULL); 410 411 if (!ireg) 412 goto out; 413 414 maxcpus = ireg[num_addr_cell + num_size_cell]; 415 416 /* Double maxcpus for processors which have SMT capability */ 417 if (cpu_has_feature(CPU_FTR_SMT)) 418 maxcpus *= 2; 419 420 if (maxcpus > NR_CPUS) { 421 printk(KERN_WARNING 422 "Partition configured for %d cpus, " 423 "operating system maximum is %d.\n", 424 maxcpus, NR_CPUS); 425 maxcpus = NR_CPUS; 426 } else 427 printk(KERN_INFO "Partition configured for %d cpus.\n", 428 maxcpus); 429 430 for (cpu = 0; cpu < maxcpus; cpu++) 431 cpu_set(cpu, cpu_possible_map); 432 out: 433 of_node_put(dn); 434 } 435 436 /* 437 * Do the sibling map; assume only two threads per processor. 438 */ 439 for_each_cpu(cpu) { 440 cpu_set(cpu, cpu_sibling_map[cpu]); 441 if (cpu_has_feature(CPU_FTR_SMT)) 442 cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]); 443 } 444 445 vdso_data->processorCount = num_present_cpus(); 446 #endif /* CONFIG_PPC64 */ 447 } 448 #endif /* CONFIG_SMP */ 449 450 #ifdef CONFIG_XMON 451 static int __init early_xmon(char *p) 452 { 453 /* ensure xmon is enabled */ 454 if (p) { 455 if (strncmp(p, "on", 2) == 0) 456 xmon_init(1); 457 if (strncmp(p, "off", 3) == 0) 458 xmon_init(0); 459 if (strncmp(p, "early", 5) != 0) 460 return 0; 461 } 462 xmon_init(1); 463 debugger(NULL); 464 465 return 0; 466 } 467 early_param("xmon", early_xmon); 468 #endif 469