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/module.h> 16 #include <linux/string.h> 17 #include <linux/sched.h> 18 #include <linux/init.h> 19 #include <linux/kernel.h> 20 #include <linux/reboot.h> 21 #include <linux/delay.h> 22 #include <linux/initrd.h> 23 #include <linux/seq_file.h> 24 #include <linux/ioport.h> 25 #include <linux/console.h> 26 #include <linux/utsname.h> 27 #include <linux/tty.h> 28 #include <linux/root_dev.h> 29 #include <linux/notifier.h> 30 #include <linux/cpu.h> 31 #include <linux/unistd.h> 32 #include <linux/serial.h> 33 #include <linux/serial_8250.h> 34 #include <linux/bootmem.h> 35 #include <linux/pci.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/firmware.h> 60 #include <asm/xmon.h> 61 #include <asm/udbg.h> 62 #include <asm/kexec.h> 63 64 #include "setup.h" 65 66 #ifdef DEBUG 67 #define DBG(fmt...) udbg_printf(fmt) 68 #else 69 #define DBG(fmt...) 70 #endif 71 72 int have_of = 1; 73 int boot_cpuid = 0; 74 u64 ppc64_pft_size; 75 76 /* Pick defaults since we might want to patch instructions 77 * before we've read this from the device tree. 78 */ 79 struct ppc64_caches ppc64_caches = { 80 .dline_size = 0x40, 81 .log_dline_size = 6, 82 .iline_size = 0x40, 83 .log_iline_size = 6 84 }; 85 EXPORT_SYMBOL_GPL(ppc64_caches); 86 87 /* 88 * These are used in binfmt_elf.c to put aux entries on the stack 89 * for each elf executable being started. 90 */ 91 int dcache_bsize; 92 int icache_bsize; 93 int ucache_bsize; 94 95 #ifdef CONFIG_SMP 96 97 static int smt_enabled_cmdline; 98 99 /* Look for ibm,smt-enabled OF option */ 100 static void check_smt_enabled(void) 101 { 102 struct device_node *dn; 103 const char *smt_option; 104 105 /* Allow the command line to overrule the OF option */ 106 if (smt_enabled_cmdline) 107 return; 108 109 dn = of_find_node_by_path("/options"); 110 111 if (dn) { 112 smt_option = of_get_property(dn, "ibm,smt-enabled", NULL); 113 114 if (smt_option) { 115 if (!strcmp(smt_option, "on")) 116 smt_enabled_at_boot = 1; 117 else if (!strcmp(smt_option, "off")) 118 smt_enabled_at_boot = 0; 119 } 120 } 121 } 122 123 /* Look for smt-enabled= cmdline option */ 124 static int __init early_smt_enabled(char *p) 125 { 126 smt_enabled_cmdline = 1; 127 128 if (!p) 129 return 0; 130 131 if (!strcmp(p, "on") || !strcmp(p, "1")) 132 smt_enabled_at_boot = 1; 133 else if (!strcmp(p, "off") || !strcmp(p, "0")) 134 smt_enabled_at_boot = 0; 135 136 return 0; 137 } 138 early_param("smt-enabled", early_smt_enabled); 139 140 #else 141 #define check_smt_enabled() 142 #endif /* CONFIG_SMP */ 143 144 /* Put the paca pointer into r13 and SPRG3 */ 145 void __init setup_paca(int cpu) 146 { 147 local_paca = &paca[cpu]; 148 mtspr(SPRN_SPRG3, local_paca); 149 } 150 151 /* 152 * Early initialization entry point. This is called by head.S 153 * with MMU translation disabled. We rely on the "feature" of 154 * the CPU that ignores the top 2 bits of the address in real 155 * mode so we can access kernel globals normally provided we 156 * only toy with things in the RMO region. From here, we do 157 * some early parsing of the device-tree to setup out LMB 158 * data structures, and allocate & initialize the hash table 159 * and segment tables so we can start running with translation 160 * enabled. 161 * 162 * It is this function which will call the probe() callback of 163 * the various platform types and copy the matching one to the 164 * global ppc_md structure. Your platform can eventually do 165 * some very early initializations from the probe() routine, but 166 * this is not recommended, be very careful as, for example, the 167 * device-tree is not accessible via normal means at this point. 168 */ 169 170 void __init early_setup(unsigned long dt_ptr) 171 { 172 /* Identify CPU type */ 173 identify_cpu(0, mfspr(SPRN_PVR)); 174 175 /* Assume we're on cpu 0 for now. Don't write to the paca yet! */ 176 setup_paca(0); 177 178 /* Enable early debugging if any specified (see udbg.h) */ 179 udbg_early_init(); 180 181 DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr); 182 183 /* 184 * Do early initialization using the flattened device 185 * tree, such as retrieving the physical memory map or 186 * calculating/retrieving the hash table size. 187 */ 188 early_init_devtree(__va(dt_ptr)); 189 190 /* Now we know the logical id of our boot cpu, setup the paca. */ 191 setup_paca(boot_cpuid); 192 193 /* Fix up paca fields required for the boot cpu */ 194 get_paca()->cpu_start = 1; 195 get_paca()->stab_real = __pa((u64)&initial_stab); 196 get_paca()->stab_addr = (u64)&initial_stab; 197 198 /* Probe the machine type */ 199 probe_machine(); 200 201 setup_kdump_trampoline(); 202 203 DBG("Found, Initializing memory management...\n"); 204 205 /* 206 * Initialize the MMU Hash table and create the linear mapping 207 * of memory. Has to be done before stab/slb initialization as 208 * this is currently where the page size encoding is obtained 209 */ 210 htab_initialize(); 211 212 /* 213 * Initialize stab / SLB management except on iSeries 214 */ 215 if (cpu_has_feature(CPU_FTR_SLB)) 216 slb_initialize(); 217 else if (!firmware_has_feature(FW_FEATURE_ISERIES)) 218 stab_initialize(get_paca()->stab_real); 219 220 DBG(" <- early_setup()\n"); 221 } 222 223 #ifdef CONFIG_SMP 224 void early_setup_secondary(void) 225 { 226 struct paca_struct *lpaca = get_paca(); 227 228 /* Mark interrupts enabled in PACA */ 229 lpaca->soft_enabled = 0; 230 231 /* Initialize hash table for that CPU */ 232 htab_initialize_secondary(); 233 234 /* Initialize STAB/SLB. We use a virtual address as it works 235 * in real mode on pSeries and we want a virutal address on 236 * iSeries anyway 237 */ 238 if (cpu_has_feature(CPU_FTR_SLB)) 239 slb_initialize(); 240 else 241 stab_initialize(lpaca->stab_addr); 242 } 243 244 #endif /* CONFIG_SMP */ 245 246 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) 247 void smp_release_cpus(void) 248 { 249 extern unsigned long __secondary_hold_spinloop; 250 unsigned long *ptr; 251 252 DBG(" -> smp_release_cpus()\n"); 253 254 /* All secondary cpus are spinning on a common spinloop, release them 255 * all now so they can start to spin on their individual paca 256 * spinloops. For non SMP kernels, the secondary cpus never get out 257 * of the common spinloop. 258 * This is useless but harmless on iSeries, secondaries are already 259 * waiting on their paca spinloops. */ 260 261 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop 262 - PHYSICAL_START); 263 *ptr = 1; 264 mb(); 265 266 DBG(" <- smp_release_cpus()\n"); 267 } 268 #endif /* CONFIG_SMP || CONFIG_KEXEC */ 269 270 /* 271 * Initialize some remaining members of the ppc64_caches and systemcfg 272 * structures 273 * (at least until we get rid of them completely). This is mostly some 274 * cache informations about the CPU that will be used by cache flush 275 * routines and/or provided to userland 276 */ 277 static void __init initialize_cache_info(void) 278 { 279 struct device_node *np; 280 unsigned long num_cpus = 0; 281 282 DBG(" -> initialize_cache_info()\n"); 283 284 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) { 285 num_cpus += 1; 286 287 /* We're assuming *all* of the CPUs have the same 288 * d-cache and i-cache sizes... -Peter 289 */ 290 291 if ( num_cpus == 1 ) { 292 const u32 *sizep, *lsizep; 293 u32 size, lsize; 294 295 size = 0; 296 lsize = cur_cpu_spec->dcache_bsize; 297 sizep = of_get_property(np, "d-cache-size", NULL); 298 if (sizep != NULL) 299 size = *sizep; 300 lsizep = of_get_property(np, "d-cache-block-size", NULL); 301 /* fallback if block size missing */ 302 if (lsizep == NULL) 303 lsizep = of_get_property(np, "d-cache-line-size", NULL); 304 if (lsizep != NULL) 305 lsize = *lsizep; 306 if (sizep == 0 || lsizep == 0) 307 DBG("Argh, can't find dcache properties ! " 308 "sizep: %p, lsizep: %p\n", sizep, lsizep); 309 310 ppc64_caches.dsize = size; 311 ppc64_caches.dline_size = lsize; 312 ppc64_caches.log_dline_size = __ilog2(lsize); 313 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; 314 315 size = 0; 316 lsize = cur_cpu_spec->icache_bsize; 317 sizep = of_get_property(np, "i-cache-size", NULL); 318 if (sizep != NULL) 319 size = *sizep; 320 lsizep = of_get_property(np, "i-cache-block-size", NULL); 321 if (lsizep == NULL) 322 lsizep = of_get_property(np, "i-cache-line-size", NULL); 323 if (lsizep != NULL) 324 lsize = *lsizep; 325 if (sizep == 0 || lsizep == 0) 326 DBG("Argh, can't find icache properties ! " 327 "sizep: %p, lsizep: %p\n", sizep, lsizep); 328 329 ppc64_caches.isize = size; 330 ppc64_caches.iline_size = lsize; 331 ppc64_caches.log_iline_size = __ilog2(lsize); 332 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; 333 } 334 } 335 336 DBG(" <- initialize_cache_info()\n"); 337 } 338 339 340 /* 341 * Do some initial setup of the system. The parameters are those which 342 * were passed in from the bootloader. 343 */ 344 void __init setup_system(void) 345 { 346 DBG(" -> setup_system()\n"); 347 348 /* Apply the CPUs-specific and firmware specific fixups to kernel 349 * text (nop out sections not relevant to this CPU or this firmware) 350 */ 351 do_feature_fixups(cur_cpu_spec->cpu_features, 352 &__start___ftr_fixup, &__stop___ftr_fixup); 353 do_feature_fixups(powerpc_firmware_features, 354 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); 355 356 /* 357 * Unflatten the device-tree passed by prom_init or kexec 358 */ 359 unflatten_device_tree(); 360 361 /* 362 * Fill the ppc64_caches & systemcfg structures with informations 363 * retrieved from the device-tree. 364 */ 365 initialize_cache_info(); 366 367 /* 368 * Initialize irq remapping subsystem 369 */ 370 irq_early_init(); 371 372 #ifdef CONFIG_PPC_RTAS 373 /* 374 * Initialize RTAS if available 375 */ 376 rtas_initialize(); 377 #endif /* CONFIG_PPC_RTAS */ 378 379 /* 380 * Check if we have an initrd provided via the device-tree 381 */ 382 check_for_initrd(); 383 384 /* 385 * Do some platform specific early initializations, that includes 386 * setting up the hash table pointers. It also sets up some interrupt-mapping 387 * related options that will be used by finish_device_tree() 388 */ 389 if (ppc_md.init_early) 390 ppc_md.init_early(); 391 392 /* 393 * We can discover serial ports now since the above did setup the 394 * hash table management for us, thus ioremap works. We do that early 395 * so that further code can be debugged 396 */ 397 find_legacy_serial_ports(); 398 399 /* 400 * Register early console 401 */ 402 register_early_udbg_console(); 403 404 /* 405 * Initialize xmon 406 */ 407 xmon_setup(); 408 409 check_smt_enabled(); 410 smp_setup_cpu_maps(); 411 412 #ifdef CONFIG_SMP 413 /* Release secondary cpus out of their spinloops at 0x60 now that 414 * we can map physical -> logical CPU ids 415 */ 416 smp_release_cpus(); 417 #endif 418 419 printk("Starting Linux PPC64 %s\n", init_utsname()->version); 420 421 printk("-----------------------------------------------------\n"); 422 printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size); 423 printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size()); 424 if (ppc64_caches.dline_size != 0x80) 425 printk("ppc64_caches.dcache_line_size = 0x%x\n", 426 ppc64_caches.dline_size); 427 if (ppc64_caches.iline_size != 0x80) 428 printk("ppc64_caches.icache_line_size = 0x%x\n", 429 ppc64_caches.iline_size); 430 if (htab_address) 431 printk("htab_address = 0x%p\n", htab_address); 432 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); 433 #if PHYSICAL_START > 0 434 printk("physical_start = 0x%x\n", PHYSICAL_START); 435 #endif 436 printk("-----------------------------------------------------\n"); 437 438 DBG(" <- setup_system()\n"); 439 } 440 441 #ifdef CONFIG_IRQSTACKS 442 static void __init irqstack_early_init(void) 443 { 444 unsigned int i; 445 446 /* 447 * interrupt stacks must be under 256MB, we cannot afford to take 448 * SLB misses on them. 449 */ 450 for_each_possible_cpu(i) { 451 softirq_ctx[i] = (struct thread_info *) 452 __va(lmb_alloc_base(THREAD_SIZE, 453 THREAD_SIZE, 0x10000000)); 454 hardirq_ctx[i] = (struct thread_info *) 455 __va(lmb_alloc_base(THREAD_SIZE, 456 THREAD_SIZE, 0x10000000)); 457 } 458 } 459 #else 460 #define irqstack_early_init() 461 #endif 462 463 /* 464 * Stack space used when we detect a bad kernel stack pointer, and 465 * early in SMP boots before relocation is enabled. 466 */ 467 static void __init emergency_stack_init(void) 468 { 469 unsigned long limit; 470 unsigned int i; 471 472 /* 473 * Emergency stacks must be under 256MB, we cannot afford to take 474 * SLB misses on them. The ABI also requires them to be 128-byte 475 * aligned. 476 * 477 * Since we use these as temporary stacks during secondary CPU 478 * bringup, we need to get at them in real mode. This means they 479 * must also be within the RMO region. 480 */ 481 limit = min(0x10000000UL, lmb.rmo_size); 482 483 for_each_possible_cpu(i) 484 paca[i].emergency_sp = 485 __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE; 486 } 487 488 /* 489 * Called into from start_kernel, after lock_kernel has been called. 490 * Initializes bootmem, which is unsed to manage page allocation until 491 * mem_init is called. 492 */ 493 void __init setup_arch(char **cmdline_p) 494 { 495 ppc64_boot_msg(0x12, "Setup Arch"); 496 497 *cmdline_p = cmd_line; 498 499 /* 500 * Set cache line size based on type of cpu as a default. 501 * Systems with OF can look in the properties on the cpu node(s) 502 * for a possibly more accurate value. 503 */ 504 dcache_bsize = ppc64_caches.dline_size; 505 icache_bsize = ppc64_caches.iline_size; 506 507 /* reboot on panic */ 508 panic_timeout = 180; 509 510 if (ppc_md.panic) 511 setup_panic(); 512 513 init_mm.start_code = PAGE_OFFSET; 514 init_mm.end_code = (unsigned long) _etext; 515 init_mm.end_data = (unsigned long) _edata; 516 init_mm.brk = klimit; 517 518 irqstack_early_init(); 519 emergency_stack_init(); 520 521 stabs_alloc(); 522 523 /* set up the bootmem stuff with available memory */ 524 do_init_bootmem(); 525 sparse_init(); 526 527 #ifdef CONFIG_DUMMY_CONSOLE 528 conswitchp = &dummy_con; 529 #endif 530 531 if (ppc_md.setup_arch) 532 ppc_md.setup_arch(); 533 534 paging_init(); 535 ppc64_boot_msg(0x15, "Setup Done"); 536 } 537 538 539 /* ToDo: do something useful if ppc_md is not yet setup. */ 540 #define PPC64_LINUX_FUNCTION 0x0f000000 541 #define PPC64_IPL_MESSAGE 0xc0000000 542 #define PPC64_TERM_MESSAGE 0xb0000000 543 544 static void ppc64_do_msg(unsigned int src, const char *msg) 545 { 546 if (ppc_md.progress) { 547 char buf[128]; 548 549 sprintf(buf, "%08X\n", src); 550 ppc_md.progress(buf, 0); 551 snprintf(buf, 128, "%s", msg); 552 ppc_md.progress(buf, 0); 553 } 554 } 555 556 /* Print a boot progress message. */ 557 void ppc64_boot_msg(unsigned int src, const char *msg) 558 { 559 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg); 560 printk("[boot]%04x %s\n", src, msg); 561 } 562 563 /* Print a termination message (print only -- does not stop the kernel) */ 564 void ppc64_terminate_msg(unsigned int src, const char *msg) 565 { 566 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg); 567 printk("[terminate]%04x %s\n", src, msg); 568 } 569 570 void cpu_die(void) 571 { 572 if (ppc_md.cpu_die) 573 ppc_md.cpu_die(); 574 } 575 576 #ifdef CONFIG_SMP 577 void __init setup_per_cpu_areas(void) 578 { 579 int i; 580 unsigned long size; 581 char *ptr; 582 583 /* Copy section for each CPU (we discard the original) */ 584 size = ALIGN(__per_cpu_end - __per_cpu_start, PAGE_SIZE); 585 #ifdef CONFIG_MODULES 586 if (size < PERCPU_ENOUGH_ROOM) 587 size = PERCPU_ENOUGH_ROOM; 588 #endif 589 590 for_each_possible_cpu(i) { 591 ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size); 592 if (!ptr) 593 panic("Cannot allocate cpu data for CPU %d\n", i); 594 595 paca[i].data_offset = ptr - __per_cpu_start; 596 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); 597 } 598 599 /* Now that per_cpu is setup, initialize cpu_sibling_map */ 600 smp_setup_cpu_sibling_map(); 601 } 602 #endif 603 604 605 #ifdef CONFIG_PPC_INDIRECT_IO 606 struct ppc_pci_io ppc_pci_io; 607 EXPORT_SYMBOL(ppc_pci_io); 608 #endif /* CONFIG_PPC_INDIRECT_IO */ 609 610