setup_64.c revision 6f0ef0f505af1ce6e9756087a9d4cc3778bae8c6
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 <linux/lockdep.h> 37#include <linux/lmb.h> 38#include <asm/io.h> 39#include <asm/kdump.h> 40#include <asm/prom.h> 41#include <asm/processor.h> 42#include <asm/pgtable.h> 43#include <asm/smp.h> 44#include <asm/elf.h> 45#include <asm/machdep.h> 46#include <asm/paca.h> 47#include <asm/time.h> 48#include <asm/cputable.h> 49#include <asm/sections.h> 50#include <asm/btext.h> 51#include <asm/nvram.h> 52#include <asm/setup.h> 53#include <asm/system.h> 54#include <asm/rtas.h> 55#include <asm/iommu.h> 56#include <asm/serial.h> 57#include <asm/cache.h> 58#include <asm/page.h> 59#include <asm/mmu.h> 60#include <asm/firmware.h> 61#include <asm/xmon.h> 62#include <asm/udbg.h> 63#include <asm/kexec.h> 64#include <asm/swiotlb.h> 65 66#include "setup.h" 67 68#ifdef DEBUG 69#define DBG(fmt...) udbg_printf(fmt) 70#else 71#define DBG(fmt...) 72#endif 73 74int boot_cpuid = 0; 75u64 ppc64_pft_size; 76 77/* Pick defaults since we might want to patch instructions 78 * before we've read this from the device tree. 79 */ 80struct ppc64_caches ppc64_caches = { 81 .dline_size = 0x40, 82 .log_dline_size = 6, 83 .iline_size = 0x40, 84 .log_iline_size = 6 85}; 86EXPORT_SYMBOL_GPL(ppc64_caches); 87 88/* 89 * These are used in binfmt_elf.c to put aux entries on the stack 90 * for each elf executable being started. 91 */ 92int dcache_bsize; 93int icache_bsize; 94int ucache_bsize; 95 96#ifdef CONFIG_SMP 97 98static int smt_enabled_cmdline; 99 100/* Look for ibm,smt-enabled OF option */ 101static void check_smt_enabled(void) 102{ 103 struct device_node *dn; 104 const char *smt_option; 105 106 /* Allow the command line to overrule the OF option */ 107 if (smt_enabled_cmdline) 108 return; 109 110 dn = of_find_node_by_path("/options"); 111 112 if (dn) { 113 smt_option = of_get_property(dn, "ibm,smt-enabled", NULL); 114 115 if (smt_option) { 116 if (!strcmp(smt_option, "on")) 117 smt_enabled_at_boot = 1; 118 else if (!strcmp(smt_option, "off")) 119 smt_enabled_at_boot = 0; 120 } 121 } 122} 123 124/* Look for smt-enabled= cmdline option */ 125static int __init early_smt_enabled(char *p) 126{ 127 smt_enabled_cmdline = 1; 128 129 if (!p) 130 return 0; 131 132 if (!strcmp(p, "on") || !strcmp(p, "1")) 133 smt_enabled_at_boot = 1; 134 else if (!strcmp(p, "off") || !strcmp(p, "0")) 135 smt_enabled_at_boot = 0; 136 137 return 0; 138} 139early_param("smt-enabled", early_smt_enabled); 140 141#else 142#define check_smt_enabled() 143#endif /* CONFIG_SMP */ 144 145/* Put the paca pointer into r13 and SPRG_PACA */ 146void __init setup_paca(int cpu) 147{ 148 local_paca = &paca[cpu]; 149 mtspr(SPRN_SPRG_PACA, local_paca); 150} 151 152/* 153 * Early initialization entry point. This is called by head.S 154 * with MMU translation disabled. We rely on the "feature" of 155 * the CPU that ignores the top 2 bits of the address in real 156 * mode so we can access kernel globals normally provided we 157 * only toy with things in the RMO region. From here, we do 158 * some early parsing of the device-tree to setup out LMB 159 * data structures, and allocate & initialize the hash table 160 * and segment tables so we can start running with translation 161 * enabled. 162 * 163 * It is this function which will call the probe() callback of 164 * the various platform types and copy the matching one to the 165 * global ppc_md structure. Your platform can eventually do 166 * some very early initializations from the probe() routine, but 167 * this is not recommended, be very careful as, for example, the 168 * device-tree is not accessible via normal means at this point. 169 */ 170 171void __init early_setup(unsigned long dt_ptr) 172{ 173 /* -------- printk is _NOT_ safe to use here ! ------- */ 174 175 /* Fill in any unititialised pacas */ 176 initialise_pacas(); 177 178 /* Identify CPU type */ 179 identify_cpu(0, mfspr(SPRN_PVR)); 180 181 /* Assume we're on cpu 0 for now. Don't write to the paca yet! */ 182 setup_paca(0); 183 184 /* Initialize lockdep early or else spinlocks will blow */ 185 lockdep_init(); 186 187 /* -------- printk is now safe to use ------- */ 188 189 /* Enable early debugging if any specified (see udbg.h) */ 190 udbg_early_init(); 191 192 DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr); 193 194 /* 195 * Do early initialization using the flattened device 196 * tree, such as retrieving the physical memory map or 197 * calculating/retrieving the hash table size. 198 */ 199 early_init_devtree(__va(dt_ptr)); 200 201 /* Now we know the logical id of our boot cpu, setup the paca. */ 202 setup_paca(boot_cpuid); 203 204 /* Fix up paca fields required for the boot cpu */ 205 get_paca()->cpu_start = 1; 206 207 /* Probe the machine type */ 208 probe_machine(); 209 210 setup_kdump_trampoline(); 211 212 DBG("Found, Initializing memory management...\n"); 213 214 /* Initialize the hash table or TLB handling */ 215 early_init_mmu(); 216 217 DBG(" <- early_setup()\n"); 218} 219 220#ifdef CONFIG_SMP 221void early_setup_secondary(void) 222{ 223 /* Mark interrupts enabled in PACA */ 224 get_paca()->soft_enabled = 0; 225 226 /* Initialize the hash table or TLB handling */ 227 early_init_mmu_secondary(); 228} 229 230#endif /* CONFIG_SMP */ 231 232#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) 233extern unsigned long __secondary_hold_spinloop; 234extern void generic_secondary_smp_init(void); 235 236void smp_release_cpus(void) 237{ 238 unsigned long *ptr; 239 240 DBG(" -> smp_release_cpus()\n"); 241 242 /* All secondary cpus are spinning on a common spinloop, release them 243 * all now so they can start to spin on their individual paca 244 * spinloops. For non SMP kernels, the secondary cpus never get out 245 * of the common spinloop. 246 */ 247 248 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop 249 - PHYSICAL_START); 250 *ptr = __pa(generic_secondary_smp_init); 251 mb(); 252 253 DBG(" <- smp_release_cpus()\n"); 254} 255#endif /* CONFIG_SMP || CONFIG_KEXEC */ 256 257/* 258 * Initialize some remaining members of the ppc64_caches and systemcfg 259 * structures 260 * (at least until we get rid of them completely). This is mostly some 261 * cache informations about the CPU that will be used by cache flush 262 * routines and/or provided to userland 263 */ 264static void __init initialize_cache_info(void) 265{ 266 struct device_node *np; 267 unsigned long num_cpus = 0; 268 269 DBG(" -> initialize_cache_info()\n"); 270 271 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) { 272 num_cpus += 1; 273 274 /* We're assuming *all* of the CPUs have the same 275 * d-cache and i-cache sizes... -Peter 276 */ 277 278 if ( num_cpus == 1 ) { 279 const u32 *sizep, *lsizep; 280 u32 size, lsize; 281 282 size = 0; 283 lsize = cur_cpu_spec->dcache_bsize; 284 sizep = of_get_property(np, "d-cache-size", NULL); 285 if (sizep != NULL) 286 size = *sizep; 287 lsizep = of_get_property(np, "d-cache-block-size", NULL); 288 /* fallback if block size missing */ 289 if (lsizep == NULL) 290 lsizep = of_get_property(np, "d-cache-line-size", NULL); 291 if (lsizep != NULL) 292 lsize = *lsizep; 293 if (sizep == 0 || lsizep == 0) 294 DBG("Argh, can't find dcache properties ! " 295 "sizep: %p, lsizep: %p\n", sizep, lsizep); 296 297 ppc64_caches.dsize = size; 298 ppc64_caches.dline_size = lsize; 299 ppc64_caches.log_dline_size = __ilog2(lsize); 300 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; 301 302 size = 0; 303 lsize = cur_cpu_spec->icache_bsize; 304 sizep = of_get_property(np, "i-cache-size", NULL); 305 if (sizep != NULL) 306 size = *sizep; 307 lsizep = of_get_property(np, "i-cache-block-size", NULL); 308 if (lsizep == NULL) 309 lsizep = of_get_property(np, "i-cache-line-size", NULL); 310 if (lsizep != NULL) 311 lsize = *lsizep; 312 if (sizep == 0 || lsizep == 0) 313 DBG("Argh, can't find icache properties ! " 314 "sizep: %p, lsizep: %p\n", sizep, lsizep); 315 316 ppc64_caches.isize = size; 317 ppc64_caches.iline_size = lsize; 318 ppc64_caches.log_iline_size = __ilog2(lsize); 319 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; 320 } 321 } 322 323 DBG(" <- initialize_cache_info()\n"); 324} 325 326 327/* 328 * Do some initial setup of the system. The parameters are those which 329 * were passed in from the bootloader. 330 */ 331void __init setup_system(void) 332{ 333 DBG(" -> setup_system()\n"); 334 335 /* Apply the CPUs-specific and firmware specific fixups to kernel 336 * text (nop out sections not relevant to this CPU or this firmware) 337 */ 338 do_feature_fixups(cur_cpu_spec->cpu_features, 339 &__start___ftr_fixup, &__stop___ftr_fixup); 340 do_feature_fixups(cur_cpu_spec->mmu_features, 341 &__start___mmu_ftr_fixup, &__stop___mmu_ftr_fixup); 342 do_feature_fixups(powerpc_firmware_features, 343 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); 344 do_lwsync_fixups(cur_cpu_spec->cpu_features, 345 &__start___lwsync_fixup, &__stop___lwsync_fixup); 346 347 /* 348 * Unflatten the device-tree passed by prom_init or kexec 349 */ 350 unflatten_device_tree(); 351 352 /* 353 * Fill the ppc64_caches & systemcfg structures with informations 354 * retrieved from the device-tree. 355 */ 356 initialize_cache_info(); 357 358 /* 359 * Initialize irq remapping subsystem 360 */ 361 irq_early_init(); 362 363#ifdef CONFIG_PPC_RTAS 364 /* 365 * Initialize RTAS if available 366 */ 367 rtas_initialize(); 368#endif /* CONFIG_PPC_RTAS */ 369 370 /* 371 * Check if we have an initrd provided via the device-tree 372 */ 373 check_for_initrd(); 374 375 /* 376 * Do some platform specific early initializations, that includes 377 * setting up the hash table pointers. It also sets up some interrupt-mapping 378 * related options that will be used by finish_device_tree() 379 */ 380 if (ppc_md.init_early) 381 ppc_md.init_early(); 382 383 /* 384 * We can discover serial ports now since the above did setup the 385 * hash table management for us, thus ioremap works. We do that early 386 * so that further code can be debugged 387 */ 388 find_legacy_serial_ports(); 389 390 /* 391 * Register early console 392 */ 393 register_early_udbg_console(); 394 395 /* 396 * Initialize xmon 397 */ 398 xmon_setup(); 399 400 check_smt_enabled(); 401 smp_setup_cpu_maps(); 402 403#ifdef CONFIG_SMP 404 /* Release secondary cpus out of their spinloops at 0x60 now that 405 * we can map physical -> logical CPU ids 406 */ 407 smp_release_cpus(); 408#endif 409 410 printk("Starting Linux PPC64 %s\n", init_utsname()->version); 411 412 printk("-----------------------------------------------------\n"); 413 printk("ppc64_pft_size = 0x%llx\n", ppc64_pft_size); 414 printk("physicalMemorySize = 0x%llx\n", lmb_phys_mem_size()); 415 if (ppc64_caches.dline_size != 0x80) 416 printk("ppc64_caches.dcache_line_size = 0x%x\n", 417 ppc64_caches.dline_size); 418 if (ppc64_caches.iline_size != 0x80) 419 printk("ppc64_caches.icache_line_size = 0x%x\n", 420 ppc64_caches.iline_size); 421#ifdef CONFIG_PPC_STD_MMU_64 422 if (htab_address) 423 printk("htab_address = 0x%p\n", htab_address); 424 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); 425#endif /* CONFIG_PPC_STD_MMU_64 */ 426 if (PHYSICAL_START > 0) 427 printk("physical_start = 0x%llx\n", 428 (unsigned long long)PHYSICAL_START); 429 printk("-----------------------------------------------------\n"); 430 431 DBG(" <- setup_system()\n"); 432} 433 434#ifdef CONFIG_IRQSTACKS 435static void __init irqstack_early_init(void) 436{ 437 unsigned int i; 438 439 /* 440 * interrupt stacks must be under 256MB, we cannot afford to take 441 * SLB misses on them. 442 */ 443 for_each_possible_cpu(i) { 444 softirq_ctx[i] = (struct thread_info *) 445 __va(lmb_alloc_base(THREAD_SIZE, 446 THREAD_SIZE, 0x10000000)); 447 hardirq_ctx[i] = (struct thread_info *) 448 __va(lmb_alloc_base(THREAD_SIZE, 449 THREAD_SIZE, 0x10000000)); 450 } 451} 452#else 453#define irqstack_early_init() 454#endif 455 456/* 457 * Stack space used when we detect a bad kernel stack pointer, and 458 * early in SMP boots before relocation is enabled. 459 */ 460static void __init emergency_stack_init(void) 461{ 462 unsigned long limit; 463 unsigned int i; 464 465 /* 466 * Emergency stacks must be under 256MB, we cannot afford to take 467 * SLB misses on them. The ABI also requires them to be 128-byte 468 * aligned. 469 * 470 * Since we use these as temporary stacks during secondary CPU 471 * bringup, we need to get at them in real mode. This means they 472 * must also be within the RMO region. 473 */ 474 limit = min(0x10000000ULL, lmb.rmo_size); 475 476 for_each_possible_cpu(i) { 477 unsigned long sp; 478 sp = lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, limit); 479 sp += THREAD_SIZE; 480 paca[i].emergency_sp = __va(sp); 481 } 482} 483 484/* 485 * Called into from start_kernel, after lock_kernel has been called. 486 * Initializes bootmem, which is unsed to manage page allocation until 487 * mem_init is called. 488 */ 489void __init setup_arch(char **cmdline_p) 490{ 491 ppc64_boot_msg(0x12, "Setup Arch"); 492 493 *cmdline_p = cmd_line; 494 495 /* 496 * Set cache line size based on type of cpu as a default. 497 * Systems with OF can look in the properties on the cpu node(s) 498 * for a possibly more accurate value. 499 */ 500 dcache_bsize = ppc64_caches.dline_size; 501 icache_bsize = ppc64_caches.iline_size; 502 503 /* reboot on panic */ 504 panic_timeout = 180; 505 506 if (ppc_md.panic) 507 setup_panic(); 508 509 init_mm.start_code = (unsigned long)_stext; 510 init_mm.end_code = (unsigned long) _etext; 511 init_mm.end_data = (unsigned long) _edata; 512 init_mm.brk = klimit; 513 514 irqstack_early_init(); 515 emergency_stack_init(); 516 517#ifdef CONFIG_PPC_STD_MMU_64 518 stabs_alloc(); 519#endif 520 /* set up the bootmem stuff with available memory */ 521 do_init_bootmem(); 522 sparse_init(); 523 524#ifdef CONFIG_DUMMY_CONSOLE 525 conswitchp = &dummy_con; 526#endif 527 528 if (ppc_md.setup_arch) 529 ppc_md.setup_arch(); 530 531#ifdef CONFIG_SWIOTLB 532 if (ppc_swiotlb_enable) 533 swiotlb_init(); 534#endif 535 536 paging_init(); 537 538 /* Initialize the MMU context management stuff */ 539 mmu_context_init(); 540 541 ppc64_boot_msg(0x15, "Setup Done"); 542} 543 544 545/* ToDo: do something useful if ppc_md is not yet setup. */ 546#define PPC64_LINUX_FUNCTION 0x0f000000 547#define PPC64_IPL_MESSAGE 0xc0000000 548#define PPC64_TERM_MESSAGE 0xb0000000 549 550static void ppc64_do_msg(unsigned int src, const char *msg) 551{ 552 if (ppc_md.progress) { 553 char buf[128]; 554 555 sprintf(buf, "%08X\n", src); 556 ppc_md.progress(buf, 0); 557 snprintf(buf, 128, "%s", msg); 558 ppc_md.progress(buf, 0); 559 } 560} 561 562/* Print a boot progress message. */ 563void ppc64_boot_msg(unsigned int src, const char *msg) 564{ 565 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg); 566 printk("[boot]%04x %s\n", src, msg); 567} 568 569void cpu_die(void) 570{ 571 if (ppc_md.cpu_die) 572 ppc_md.cpu_die(); 573} 574 575#ifdef CONFIG_SMP 576void __init setup_per_cpu_areas(void) 577{ 578 int i; 579 unsigned long size; 580 char *ptr; 581 582 /* Copy section for each CPU (we discard the original) */ 583 size = ALIGN(__per_cpu_end - __per_cpu_start, PAGE_SIZE); 584#ifdef CONFIG_MODULES 585 if (size < PERCPU_ENOUGH_ROOM) 586 size = PERCPU_ENOUGH_ROOM; 587#endif 588 589 for_each_possible_cpu(i) { 590 ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size); 591 592 paca[i].data_offset = ptr - __per_cpu_start; 593 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); 594 } 595} 596#endif 597 598 599#ifdef CONFIG_PPC_INDIRECT_IO 600struct ppc_pci_io ppc_pci_io; 601EXPORT_SYMBOL(ppc_pci_io); 602#endif /* CONFIG_PPC_INDIRECT_IO */ 603 604