1 /* 2 * 3 * Common boot and setup code. 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 13 #undef DEBUG 14 15 #include <linux/config.h> 16 #include <linux/module.h> 17 #include <linux/string.h> 18 #include <linux/sched.h> 19 #include <linux/init.h> 20 #include <linux/kernel.h> 21 #include <linux/reboot.h> 22 #include <linux/delay.h> 23 #include <linux/initrd.h> 24 #include <linux/ide.h> 25 #include <linux/seq_file.h> 26 #include <linux/ioport.h> 27 #include <linux/console.h> 28 #include <linux/utsname.h> 29 #include <linux/tty.h> 30 #include <linux/root_dev.h> 31 #include <linux/notifier.h> 32 #include <linux/cpu.h> 33 #include <linux/unistd.h> 34 #include <linux/serial.h> 35 #include <linux/serial_8250.h> 36 #include <asm/io.h> 37 #include <asm/kdump.h> 38 #include <asm/prom.h> 39 #include <asm/processor.h> 40 #include <asm/pgtable.h> 41 #include <asm/smp.h> 42 #include <asm/elf.h> 43 #include <asm/machdep.h> 44 #include <asm/paca.h> 45 #include <asm/time.h> 46 #include <asm/cputable.h> 47 #include <asm/sections.h> 48 #include <asm/btext.h> 49 #include <asm/nvram.h> 50 #include <asm/setup.h> 51 #include <asm/system.h> 52 #include <asm/rtas.h> 53 #include <asm/iommu.h> 54 #include <asm/serial.h> 55 #include <asm/cache.h> 56 #include <asm/page.h> 57 #include <asm/mmu.h> 58 #include <asm/lmb.h> 59 #include <asm/iseries/it_lp_naca.h> 60 #include <asm/firmware.h> 61 #include <asm/xmon.h> 62 #include <asm/udbg.h> 63 #include <asm/kexec.h> 64 65 #include "setup.h" 66 67 #ifdef DEBUG 68 #define DBG(fmt...) udbg_printf(fmt) 69 #else 70 #define DBG(fmt...) 71 #endif 72 73 /* 74 * Here are some early debugging facilities. You can enable one 75 * but your kernel will not boot on anything else if you do so 76 */ 77 78 /* This one is for use on LPAR machines that support an HVC console 79 * on vterm 0 80 */ 81 extern void udbg_init_debug_lpar(void); 82 /* This one is for use on Apple G5 machines 83 */ 84 extern void udbg_init_pmac_realmode(void); 85 /* That's RTAS panel debug */ 86 extern void call_rtas_display_status_delay(unsigned char c); 87 /* Here's maple real mode debug */ 88 extern void udbg_init_maple_realmode(void); 89 90 #define EARLY_DEBUG_INIT() do {} while(0) 91 92 #if 0 93 #define EARLY_DEBUG_INIT() udbg_init_debug_lpar() 94 #define EARLY_DEBUG_INIT() udbg_init_maple_realmode() 95 #define EARLY_DEBUG_INIT() udbg_init_pmac_realmode() 96 #define EARLY_DEBUG_INIT() \ 97 do { udbg_putc = call_rtas_display_status_delay; } while(0) 98 #endif 99 100 int have_of = 1; 101 int boot_cpuid = 0; 102 int boot_cpuid_phys = 0; 103 dev_t boot_dev; 104 u64 ppc64_pft_size; 105 106 /* Pick defaults since we might want to patch instructions 107 * before we've read this from the device tree. 108 */ 109 struct ppc64_caches ppc64_caches = { 110 .dline_size = 0x80, 111 .log_dline_size = 7, 112 .iline_size = 0x80, 113 .log_iline_size = 7 114 }; 115 EXPORT_SYMBOL_GPL(ppc64_caches); 116 117 /* 118 * These are used in binfmt_elf.c to put aux entries on the stack 119 * for each elf executable being started. 120 */ 121 int dcache_bsize; 122 int icache_bsize; 123 int ucache_bsize; 124 125 /* The main machine-dep calls structure 126 */ 127 struct machdep_calls ppc_md; 128 EXPORT_SYMBOL(ppc_md); 129 130 #ifdef CONFIG_MAGIC_SYSRQ 131 unsigned long SYSRQ_KEY; 132 #endif /* CONFIG_MAGIC_SYSRQ */ 133 134 135 static int ppc64_panic_event(struct notifier_block *, unsigned long, void *); 136 static struct notifier_block ppc64_panic_block = { 137 .notifier_call = ppc64_panic_event, 138 .priority = INT_MIN /* may not return; must be done last */ 139 }; 140 141 #ifdef CONFIG_SMP 142 143 static int smt_enabled_cmdline; 144 145 /* Look for ibm,smt-enabled OF option */ 146 static void check_smt_enabled(void) 147 { 148 struct device_node *dn; 149 char *smt_option; 150 151 /* Allow the command line to overrule the OF option */ 152 if (smt_enabled_cmdline) 153 return; 154 155 dn = of_find_node_by_path("/options"); 156 157 if (dn) { 158 smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL); 159 160 if (smt_option) { 161 if (!strcmp(smt_option, "on")) 162 smt_enabled_at_boot = 1; 163 else if (!strcmp(smt_option, "off")) 164 smt_enabled_at_boot = 0; 165 } 166 } 167 } 168 169 /* Look for smt-enabled= cmdline option */ 170 static int __init early_smt_enabled(char *p) 171 { 172 smt_enabled_cmdline = 1; 173 174 if (!p) 175 return 0; 176 177 if (!strcmp(p, "on") || !strcmp(p, "1")) 178 smt_enabled_at_boot = 1; 179 else if (!strcmp(p, "off") || !strcmp(p, "0")) 180 smt_enabled_at_boot = 0; 181 182 return 0; 183 } 184 early_param("smt-enabled", early_smt_enabled); 185 186 #else 187 #define check_smt_enabled() 188 #endif /* CONFIG_SMP */ 189 190 extern struct machdep_calls pSeries_md; 191 extern struct machdep_calls pmac_md; 192 extern struct machdep_calls maple_md; 193 extern struct machdep_calls cell_md; 194 extern struct machdep_calls iseries_md; 195 196 /* Ultimately, stuff them in an elf section like initcalls... */ 197 static struct machdep_calls __initdata *machines[] = { 198 #ifdef CONFIG_PPC_PSERIES 199 &pSeries_md, 200 #endif /* CONFIG_PPC_PSERIES */ 201 #ifdef CONFIG_PPC_PMAC 202 &pmac_md, 203 #endif /* CONFIG_PPC_PMAC */ 204 #ifdef CONFIG_PPC_MAPLE 205 &maple_md, 206 #endif /* CONFIG_PPC_MAPLE */ 207 #ifdef CONFIG_PPC_CELL 208 &cell_md, 209 #endif 210 #ifdef CONFIG_PPC_ISERIES 211 &iseries_md, 212 #endif 213 NULL 214 }; 215 216 /* 217 * Early initialization entry point. This is called by head.S 218 * with MMU translation disabled. We rely on the "feature" of 219 * the CPU that ignores the top 2 bits of the address in real 220 * mode so we can access kernel globals normally provided we 221 * only toy with things in the RMO region. From here, we do 222 * some early parsing of the device-tree to setup out LMB 223 * data structures, and allocate & initialize the hash table 224 * and segment tables so we can start running with translation 225 * enabled. 226 * 227 * It is this function which will call the probe() callback of 228 * the various platform types and copy the matching one to the 229 * global ppc_md structure. Your platform can eventually do 230 * some very early initializations from the probe() routine, but 231 * this is not recommended, be very careful as, for example, the 232 * device-tree is not accessible via normal means at this point. 233 */ 234 235 void __init early_setup(unsigned long dt_ptr) 236 { 237 struct paca_struct *lpaca = get_paca(); 238 static struct machdep_calls **mach; 239 240 /* 241 * Enable early debugging if any specified (see top of 242 * this file) 243 */ 244 EARLY_DEBUG_INIT(); 245 246 DBG(" -> early_setup()\n"); 247 248 /* 249 * Do early initializations using the flattened device 250 * tree, like retreiving the physical memory map or 251 * calculating/retreiving the hash table size 252 */ 253 early_init_devtree(__va(dt_ptr)); 254 255 /* 256 * Iterate all ppc_md structures until we find the proper 257 * one for the current machine type 258 */ 259 DBG("Probing machine type for platform %x...\n", _machine); 260 261 for (mach = machines; *mach; mach++) { 262 if ((*mach)->probe(_machine)) 263 break; 264 } 265 /* What can we do if we didn't find ? */ 266 if (*mach == NULL) { 267 DBG("No suitable machine found !\n"); 268 for (;;); 269 } 270 ppc_md = **mach; 271 272 #ifdef CONFIG_CRASH_DUMP 273 kdump_setup(); 274 #endif 275 276 DBG("Found, Initializing memory management...\n"); 277 278 /* 279 * Initialize the MMU Hash table and create the linear mapping 280 * of memory. Has to be done before stab/slb initialization as 281 * this is currently where the page size encoding is obtained 282 */ 283 htab_initialize(); 284 285 /* 286 * Initialize stab / SLB management except on iSeries 287 */ 288 if (!firmware_has_feature(FW_FEATURE_ISERIES)) { 289 if (cpu_has_feature(CPU_FTR_SLB)) 290 slb_initialize(); 291 else 292 stab_initialize(lpaca->stab_real); 293 } 294 295 DBG(" <- early_setup()\n"); 296 } 297 298 #ifdef CONFIG_SMP 299 void early_setup_secondary(void) 300 { 301 struct paca_struct *lpaca = get_paca(); 302 303 /* Mark enabled in PACA */ 304 lpaca->proc_enabled = 0; 305 306 /* Initialize hash table for that CPU */ 307 htab_initialize_secondary(); 308 309 /* Initialize STAB/SLB. We use a virtual address as it works 310 * in real mode on pSeries and we want a virutal address on 311 * iSeries anyway 312 */ 313 if (cpu_has_feature(CPU_FTR_SLB)) 314 slb_initialize(); 315 else 316 stab_initialize(lpaca->stab_addr); 317 } 318 319 #endif /* CONFIG_SMP */ 320 321 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) 322 void smp_release_cpus(void) 323 { 324 extern unsigned long __secondary_hold_spinloop; 325 unsigned long *ptr; 326 327 DBG(" -> smp_release_cpus()\n"); 328 329 /* All secondary cpus are spinning on a common spinloop, release them 330 * all now so they can start to spin on their individual paca 331 * spinloops. For non SMP kernels, the secondary cpus never get out 332 * of the common spinloop. 333 * This is useless but harmless on iSeries, secondaries are already 334 * waiting on their paca spinloops. */ 335 336 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop 337 - PHYSICAL_START); 338 *ptr = 1; 339 mb(); 340 341 DBG(" <- smp_release_cpus()\n"); 342 } 343 #else 344 #define smp_release_cpus() 345 #endif /* CONFIG_SMP || CONFIG_KEXEC */ 346 347 /* 348 * Initialize some remaining members of the ppc64_caches and systemcfg 349 * structures 350 * (at least until we get rid of them completely). This is mostly some 351 * cache informations about the CPU that will be used by cache flush 352 * routines and/or provided to userland 353 */ 354 static void __init initialize_cache_info(void) 355 { 356 struct device_node *np; 357 unsigned long num_cpus = 0; 358 359 DBG(" -> initialize_cache_info()\n"); 360 361 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) { 362 num_cpus += 1; 363 364 /* We're assuming *all* of the CPUs have the same 365 * d-cache and i-cache sizes... -Peter 366 */ 367 368 if ( num_cpus == 1 ) { 369 u32 *sizep, *lsizep; 370 u32 size, lsize; 371 const char *dc, *ic; 372 373 /* Then read cache informations */ 374 if (_machine == PLATFORM_POWERMAC) { 375 dc = "d-cache-block-size"; 376 ic = "i-cache-block-size"; 377 } else { 378 dc = "d-cache-line-size"; 379 ic = "i-cache-line-size"; 380 } 381 382 size = 0; 383 lsize = cur_cpu_spec->dcache_bsize; 384 sizep = (u32 *)get_property(np, "d-cache-size", NULL); 385 if (sizep != NULL) 386 size = *sizep; 387 lsizep = (u32 *) get_property(np, dc, NULL); 388 if (lsizep != NULL) 389 lsize = *lsizep; 390 if (sizep == 0 || lsizep == 0) 391 DBG("Argh, can't find dcache properties ! " 392 "sizep: %p, lsizep: %p\n", sizep, lsizep); 393 394 ppc64_caches.dsize = size; 395 ppc64_caches.dline_size = lsize; 396 ppc64_caches.log_dline_size = __ilog2(lsize); 397 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; 398 399 size = 0; 400 lsize = cur_cpu_spec->icache_bsize; 401 sizep = (u32 *)get_property(np, "i-cache-size", NULL); 402 if (sizep != NULL) 403 size = *sizep; 404 lsizep = (u32 *)get_property(np, ic, NULL); 405 if (lsizep != NULL) 406 lsize = *lsizep; 407 if (sizep == 0 || lsizep == 0) 408 DBG("Argh, can't find icache properties ! " 409 "sizep: %p, lsizep: %p\n", sizep, lsizep); 410 411 ppc64_caches.isize = size; 412 ppc64_caches.iline_size = lsize; 413 ppc64_caches.log_iline_size = __ilog2(lsize); 414 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; 415 } 416 } 417 418 DBG(" <- initialize_cache_info()\n"); 419 } 420 421 422 /* 423 * Do some initial setup of the system. The parameters are those which 424 * were passed in from the bootloader. 425 */ 426 void __init setup_system(void) 427 { 428 DBG(" -> setup_system()\n"); 429 430 /* 431 * Unflatten the device-tree passed by prom_init or kexec 432 */ 433 unflatten_device_tree(); 434 435 #ifdef CONFIG_KEXEC 436 kexec_setup(); /* requires unflattened device tree. */ 437 #endif 438 439 /* 440 * Fill the ppc64_caches & systemcfg structures with informations 441 * retrieved from the device-tree. Need to be called before 442 * finish_device_tree() since the later requires some of the 443 * informations filled up here to properly parse the interrupt 444 * tree. 445 * It also sets up the cache line sizes which allows to call 446 * routines like flush_icache_range (used by the hash init 447 * later on). 448 */ 449 initialize_cache_info(); 450 451 #ifdef CONFIG_PPC_RTAS 452 /* 453 * Initialize RTAS if available 454 */ 455 rtas_initialize(); 456 #endif /* CONFIG_PPC_RTAS */ 457 458 /* 459 * Check if we have an initrd provided via the device-tree 460 */ 461 check_for_initrd(); 462 463 /* 464 * Do some platform specific early initializations, that includes 465 * setting up the hash table pointers. It also sets up some interrupt-mapping 466 * related options that will be used by finish_device_tree() 467 */ 468 ppc_md.init_early(); 469 470 /* 471 * We can discover serial ports now since the above did setup the 472 * hash table management for us, thus ioremap works. We do that early 473 * so that further code can be debugged 474 */ 475 #ifdef CONFIG_SERIAL_8250 476 find_legacy_serial_ports(); 477 #endif 478 479 /* 480 * "Finish" the device-tree, that is do the actual parsing of 481 * some of the properties like the interrupt map 482 */ 483 finish_device_tree(); 484 485 /* 486 * Initialize xmon 487 */ 488 #ifdef CONFIG_XMON_DEFAULT 489 xmon_init(1); 490 #endif 491 /* 492 * Register early console 493 */ 494 register_early_udbg_console(); 495 496 /* Save unparsed command line copy for /proc/cmdline */ 497 strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE); 498 499 parse_early_param(); 500 501 check_smt_enabled(); 502 smp_setup_cpu_maps(); 503 504 /* Release secondary cpus out of their spinloops at 0x60 now that 505 * we can map physical -> logical CPU ids 506 */ 507 smp_release_cpus(); 508 509 printk("Starting Linux PPC64 %s\n", system_utsname.version); 510 511 printk("-----------------------------------------------------\n"); 512 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size); 513 printk("ppc64_interrupt_controller = 0x%ld\n", 514 ppc64_interrupt_controller); 515 printk("platform = 0x%x\n", _machine); 516 printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size()); 517 printk("ppc64_caches.dcache_line_size = 0x%x\n", 518 ppc64_caches.dline_size); 519 printk("ppc64_caches.icache_line_size = 0x%x\n", 520 ppc64_caches.iline_size); 521 printk("htab_address = 0x%p\n", htab_address); 522 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); 523 #if PHYSICAL_START > 0 524 printk("physical_start = 0x%x\n", PHYSICAL_START); 525 #endif 526 printk("-----------------------------------------------------\n"); 527 528 mm_init_ppc64(); 529 530 DBG(" <- setup_system()\n"); 531 } 532 533 static int ppc64_panic_event(struct notifier_block *this, 534 unsigned long event, void *ptr) 535 { 536 ppc_md.panic((char *)ptr); /* May not return */ 537 return NOTIFY_DONE; 538 } 539 540 #ifdef CONFIG_IRQSTACKS 541 static void __init irqstack_early_init(void) 542 { 543 unsigned int i; 544 545 /* 546 * interrupt stacks must be under 256MB, we cannot afford to take 547 * SLB misses on them. 548 */ 549 for_each_cpu(i) { 550 softirq_ctx[i] = (struct thread_info *) 551 __va(lmb_alloc_base(THREAD_SIZE, 552 THREAD_SIZE, 0x10000000)); 553 hardirq_ctx[i] = (struct thread_info *) 554 __va(lmb_alloc_base(THREAD_SIZE, 555 THREAD_SIZE, 0x10000000)); 556 } 557 } 558 #else 559 #define irqstack_early_init() 560 #endif 561 562 /* 563 * Stack space used when we detect a bad kernel stack pointer, and 564 * early in SMP boots before relocation is enabled. 565 */ 566 static void __init emergency_stack_init(void) 567 { 568 unsigned long limit; 569 unsigned int i; 570 571 /* 572 * Emergency stacks must be under 256MB, we cannot afford to take 573 * SLB misses on them. The ABI also requires them to be 128-byte 574 * aligned. 575 * 576 * Since we use these as temporary stacks during secondary CPU 577 * bringup, we need to get at them in real mode. This means they 578 * must also be within the RMO region. 579 */ 580 limit = min(0x10000000UL, lmb.rmo_size); 581 582 for_each_cpu(i) 583 paca[i].emergency_sp = 584 __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE; 585 } 586 587 /* 588 * Called into from start_kernel, after lock_kernel has been called. 589 * Initializes bootmem, which is unsed to manage page allocation until 590 * mem_init is called. 591 */ 592 void __init setup_arch(char **cmdline_p) 593 { 594 extern void do_init_bootmem(void); 595 596 ppc64_boot_msg(0x12, "Setup Arch"); 597 598 *cmdline_p = cmd_line; 599 600 /* 601 * Set cache line size based on type of cpu as a default. 602 * Systems with OF can look in the properties on the cpu node(s) 603 * for a possibly more accurate value. 604 */ 605 dcache_bsize = ppc64_caches.dline_size; 606 icache_bsize = ppc64_caches.iline_size; 607 608 /* reboot on panic */ 609 panic_timeout = 180; 610 611 if (ppc_md.panic) 612 notifier_chain_register(&panic_notifier_list, &ppc64_panic_block); 613 614 init_mm.start_code = PAGE_OFFSET; 615 init_mm.end_code = (unsigned long) _etext; 616 init_mm.end_data = (unsigned long) _edata; 617 init_mm.brk = klimit; 618 619 irqstack_early_init(); 620 emergency_stack_init(); 621 622 stabs_alloc(); 623 624 /* set up the bootmem stuff with available memory */ 625 do_init_bootmem(); 626 sparse_init(); 627 628 #ifdef CONFIG_DUMMY_CONSOLE 629 conswitchp = &dummy_con; 630 #endif 631 632 ppc_md.setup_arch(); 633 634 /* Use the default idle loop if the platform hasn't provided one. */ 635 if (NULL == ppc_md.idle_loop) { 636 ppc_md.idle_loop = default_idle; 637 printk(KERN_INFO "Using default idle loop\n"); 638 } 639 640 paging_init(); 641 ppc64_boot_msg(0x15, "Setup Done"); 642 } 643 644 645 /* ToDo: do something useful if ppc_md is not yet setup. */ 646 #define PPC64_LINUX_FUNCTION 0x0f000000 647 #define PPC64_IPL_MESSAGE 0xc0000000 648 #define PPC64_TERM_MESSAGE 0xb0000000 649 650 static void ppc64_do_msg(unsigned int src, const char *msg) 651 { 652 if (ppc_md.progress) { 653 char buf[128]; 654 655 sprintf(buf, "%08X\n", src); 656 ppc_md.progress(buf, 0); 657 snprintf(buf, 128, "%s", msg); 658 ppc_md.progress(buf, 0); 659 } 660 } 661 662 /* Print a boot progress message. */ 663 void ppc64_boot_msg(unsigned int src, const char *msg) 664 { 665 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg); 666 printk("[boot]%04x %s\n", src, msg); 667 } 668 669 /* Print a termination message (print only -- does not stop the kernel) */ 670 void ppc64_terminate_msg(unsigned int src, const char *msg) 671 { 672 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg); 673 printk("[terminate]%04x %s\n", src, msg); 674 } 675 676 int check_legacy_ioport(unsigned long base_port) 677 { 678 if (ppc_md.check_legacy_ioport == NULL) 679 return 0; 680 return ppc_md.check_legacy_ioport(base_port); 681 } 682 EXPORT_SYMBOL(check_legacy_ioport); 683 684 void cpu_die(void) 685 { 686 if (ppc_md.cpu_die) 687 ppc_md.cpu_die(); 688 } 689