1 /* 2 * S390 version 3 * Copyright IBM Corp. 1999, 2012 4 * Author(s): Hartmut Penner (hp@de.ibm.com), 5 * Martin Schwidefsky (schwidefsky@de.ibm.com) 6 * 7 * Derived from "arch/i386/kernel/setup.c" 8 * Copyright (C) 1995, Linus Torvalds 9 */ 10 11 /* 12 * This file handles the architecture-dependent parts of initialization 13 */ 14 15 #define KMSG_COMPONENT "setup" 16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 17 18 #include <linux/errno.h> 19 #include <linux/export.h> 20 #include <linux/sched.h> 21 #include <linux/kernel.h> 22 #include <linux/memblock.h> 23 #include <linux/mm.h> 24 #include <linux/stddef.h> 25 #include <linux/unistd.h> 26 #include <linux/ptrace.h> 27 #include <linux/random.h> 28 #include <linux/user.h> 29 #include <linux/tty.h> 30 #include <linux/ioport.h> 31 #include <linux/delay.h> 32 #include <linux/init.h> 33 #include <linux/initrd.h> 34 #include <linux/bootmem.h> 35 #include <linux/root_dev.h> 36 #include <linux/console.h> 37 #include <linux/kernel_stat.h> 38 #include <linux/device.h> 39 #include <linux/notifier.h> 40 #include <linux/pfn.h> 41 #include <linux/ctype.h> 42 #include <linux/reboot.h> 43 #include <linux/topology.h> 44 #include <linux/kexec.h> 45 #include <linux/crash_dump.h> 46 #include <linux/memory.h> 47 #include <linux/compat.h> 48 49 #include <asm/ipl.h> 50 #include <asm/facility.h> 51 #include <asm/smp.h> 52 #include <asm/mmu_context.h> 53 #include <asm/cpcmd.h> 54 #include <asm/lowcore.h> 55 #include <asm/irq.h> 56 #include <asm/page.h> 57 #include <asm/ptrace.h> 58 #include <asm/sections.h> 59 #include <asm/ebcdic.h> 60 #include <asm/kvm_virtio.h> 61 #include <asm/diag.h> 62 #include <asm/os_info.h> 63 #include <asm/sclp.h> 64 #include <asm/sysinfo.h> 65 #include <asm/numa.h> 66 #include "entry.h" 67 68 /* 69 * Machine setup.. 70 */ 71 unsigned int console_mode = 0; 72 EXPORT_SYMBOL(console_mode); 73 74 unsigned int console_devno = -1; 75 EXPORT_SYMBOL(console_devno); 76 77 unsigned int console_irq = -1; 78 EXPORT_SYMBOL(console_irq); 79 80 unsigned long elf_hwcap __read_mostly = 0; 81 char elf_platform[ELF_PLATFORM_SIZE]; 82 83 unsigned long int_hwcap = 0; 84 85 int __initdata memory_end_set; 86 unsigned long __initdata memory_end; 87 unsigned long __initdata max_physmem_end; 88 89 unsigned long VMALLOC_START; 90 EXPORT_SYMBOL(VMALLOC_START); 91 92 unsigned long VMALLOC_END; 93 EXPORT_SYMBOL(VMALLOC_END); 94 95 struct page *vmemmap; 96 EXPORT_SYMBOL(vmemmap); 97 98 unsigned long MODULES_VADDR; 99 unsigned long MODULES_END; 100 101 /* An array with a pointer to the lowcore of every CPU. */ 102 struct lowcore *lowcore_ptr[NR_CPUS]; 103 EXPORT_SYMBOL(lowcore_ptr); 104 105 /* 106 * This is set up by the setup-routine at boot-time 107 * for S390 need to find out, what we have to setup 108 * using address 0x10400 ... 109 */ 110 111 #include <asm/setup.h> 112 113 /* 114 * condev= and conmode= setup parameter. 115 */ 116 117 static int __init condev_setup(char *str) 118 { 119 int vdev; 120 121 vdev = simple_strtoul(str, &str, 0); 122 if (vdev >= 0 && vdev < 65536) { 123 console_devno = vdev; 124 console_irq = -1; 125 } 126 return 1; 127 } 128 129 __setup("condev=", condev_setup); 130 131 static void __init set_preferred_console(void) 132 { 133 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 134 add_preferred_console("ttyS", 0, NULL); 135 else if (CONSOLE_IS_3270) 136 add_preferred_console("tty3270", 0, NULL); 137 else if (CONSOLE_IS_VT220) 138 add_preferred_console("ttyS", 1, NULL); 139 else if (CONSOLE_IS_HVC) 140 add_preferred_console("hvc", 0, NULL); 141 } 142 143 static int __init conmode_setup(char *str) 144 { 145 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 146 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 147 SET_CONSOLE_SCLP; 148 #endif 149 #if defined(CONFIG_TN3215_CONSOLE) 150 if (strncmp(str, "3215", 5) == 0) 151 SET_CONSOLE_3215; 152 #endif 153 #if defined(CONFIG_TN3270_CONSOLE) 154 if (strncmp(str, "3270", 5) == 0) 155 SET_CONSOLE_3270; 156 #endif 157 set_preferred_console(); 158 return 1; 159 } 160 161 __setup("conmode=", conmode_setup); 162 163 static void __init conmode_default(void) 164 { 165 char query_buffer[1024]; 166 char *ptr; 167 168 if (MACHINE_IS_VM) { 169 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 170 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 171 ptr = strstr(query_buffer, "SUBCHANNEL ="); 172 console_irq = simple_strtoul(ptr + 13, NULL, 16); 173 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 174 ptr = strstr(query_buffer, "CONMODE"); 175 /* 176 * Set the conmode to 3215 so that the device recognition 177 * will set the cu_type of the console to 3215. If the 178 * conmode is 3270 and we don't set it back then both 179 * 3215 and the 3270 driver will try to access the console 180 * device (3215 as console and 3270 as normal tty). 181 */ 182 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 183 if (ptr == NULL) { 184 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 185 SET_CONSOLE_SCLP; 186 #endif 187 return; 188 } 189 if (strncmp(ptr + 8, "3270", 4) == 0) { 190 #if defined(CONFIG_TN3270_CONSOLE) 191 SET_CONSOLE_3270; 192 #elif defined(CONFIG_TN3215_CONSOLE) 193 SET_CONSOLE_3215; 194 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 195 SET_CONSOLE_SCLP; 196 #endif 197 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 198 #if defined(CONFIG_TN3215_CONSOLE) 199 SET_CONSOLE_3215; 200 #elif defined(CONFIG_TN3270_CONSOLE) 201 SET_CONSOLE_3270; 202 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 203 SET_CONSOLE_SCLP; 204 #endif 205 } 206 } else if (MACHINE_IS_KVM) { 207 if (sclp.has_vt220 && 208 config_enabled(CONFIG_SCLP_VT220_CONSOLE)) 209 SET_CONSOLE_VT220; 210 else if (sclp.has_linemode && 211 config_enabled(CONFIG_SCLP_CONSOLE)) 212 SET_CONSOLE_SCLP; 213 else 214 SET_CONSOLE_HVC; 215 } else { 216 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 217 SET_CONSOLE_SCLP; 218 #endif 219 } 220 } 221 222 #ifdef CONFIG_CRASH_DUMP 223 static void __init setup_zfcpdump(void) 224 { 225 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 226 return; 227 if (OLDMEM_BASE) 228 return; 229 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 230 console_loglevel = 2; 231 } 232 #else 233 static inline void setup_zfcpdump(void) {} 234 #endif /* CONFIG_CRASH_DUMP */ 235 236 /* 237 * Reboot, halt and power_off stubs. They just call _machine_restart, 238 * _machine_halt or _machine_power_off. 239 */ 240 241 void machine_restart(char *command) 242 { 243 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 244 /* 245 * Only unblank the console if we are called in enabled 246 * context or a bust_spinlocks cleared the way for us. 247 */ 248 console_unblank(); 249 _machine_restart(command); 250 } 251 252 void machine_halt(void) 253 { 254 if (!in_interrupt() || oops_in_progress) 255 /* 256 * Only unblank the console if we are called in enabled 257 * context or a bust_spinlocks cleared the way for us. 258 */ 259 console_unblank(); 260 _machine_halt(); 261 } 262 263 void machine_power_off(void) 264 { 265 if (!in_interrupt() || oops_in_progress) 266 /* 267 * Only unblank the console if we are called in enabled 268 * context or a bust_spinlocks cleared the way for us. 269 */ 270 console_unblank(); 271 _machine_power_off(); 272 } 273 274 /* 275 * Dummy power off function. 276 */ 277 void (*pm_power_off)(void) = machine_power_off; 278 EXPORT_SYMBOL_GPL(pm_power_off); 279 280 static int __init early_parse_mem(char *p) 281 { 282 memory_end = memparse(p, &p); 283 memory_end &= PAGE_MASK; 284 memory_end_set = 1; 285 return 0; 286 } 287 early_param("mem", early_parse_mem); 288 289 static int __init parse_vmalloc(char *arg) 290 { 291 if (!arg) 292 return -EINVAL; 293 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 294 return 0; 295 } 296 early_param("vmalloc", parse_vmalloc); 297 298 void *restart_stack __section(.data); 299 300 static void __init setup_lowcore(void) 301 { 302 struct lowcore *lc; 303 304 /* 305 * Setup lowcore for boot cpu 306 */ 307 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096); 308 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 309 lc->restart_psw.mask = PSW_KERNEL_BITS; 310 lc->restart_psw.addr = (unsigned long) restart_int_handler; 311 lc->external_new_psw.mask = PSW_KERNEL_BITS | 312 PSW_MASK_DAT | PSW_MASK_MCHECK; 313 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 314 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 315 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 316 lc->svc_new_psw.addr = (unsigned long) system_call; 317 lc->program_new_psw.mask = PSW_KERNEL_BITS | 318 PSW_MASK_DAT | PSW_MASK_MCHECK; 319 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 320 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 321 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 322 lc->io_new_psw.mask = PSW_KERNEL_BITS | 323 PSW_MASK_DAT | PSW_MASK_MCHECK; 324 lc->io_new_psw.addr = (unsigned long) io_int_handler; 325 lc->clock_comparator = -1ULL; 326 lc->kernel_stack = ((unsigned long) &init_thread_union) 327 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 328 lc->async_stack = (unsigned long) 329 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) 330 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 331 lc->panic_stack = (unsigned long) 332 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) 333 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 334 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 335 lc->thread_info = (unsigned long) &init_thread_union; 336 lc->lpp = LPP_MAGIC; 337 lc->machine_flags = S390_lowcore.machine_flags; 338 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 339 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 340 MAX_FACILITY_BIT/8); 341 if (MACHINE_HAS_VX) 342 lc->vector_save_area_addr = 343 (unsigned long) &lc->vector_save_area; 344 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 345 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 346 lc->async_enter_timer = S390_lowcore.async_enter_timer; 347 lc->exit_timer = S390_lowcore.exit_timer; 348 lc->user_timer = S390_lowcore.user_timer; 349 lc->system_timer = S390_lowcore.system_timer; 350 lc->steal_timer = S390_lowcore.steal_timer; 351 lc->last_update_timer = S390_lowcore.last_update_timer; 352 lc->last_update_clock = S390_lowcore.last_update_clock; 353 354 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 355 restart_stack += ASYNC_SIZE; 356 357 /* 358 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 359 * restart data to the absolute zero lowcore. This is necessary if 360 * PSW restart is done on an offline CPU that has lowcore zero. 361 */ 362 lc->restart_stack = (unsigned long) restart_stack; 363 lc->restart_fn = (unsigned long) do_restart; 364 lc->restart_data = 0; 365 lc->restart_source = -1UL; 366 367 /* Setup absolute zero lowcore */ 368 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 369 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 370 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 371 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 372 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 373 374 #ifdef CONFIG_SMP 375 lc->spinlock_lockval = arch_spin_lockval(0); 376 #endif 377 378 set_prefix((u32)(unsigned long) lc); 379 lowcore_ptr[0] = lc; 380 } 381 382 static struct resource code_resource = { 383 .name = "Kernel code", 384 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 385 }; 386 387 static struct resource data_resource = { 388 .name = "Kernel data", 389 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 390 }; 391 392 static struct resource bss_resource = { 393 .name = "Kernel bss", 394 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 395 }; 396 397 static struct resource __initdata *standard_resources[] = { 398 &code_resource, 399 &data_resource, 400 &bss_resource, 401 }; 402 403 static void __init setup_resources(void) 404 { 405 struct resource *res, *std_res, *sub_res; 406 struct memblock_region *reg; 407 int j; 408 409 code_resource.start = (unsigned long) &_text; 410 code_resource.end = (unsigned long) &_etext - 1; 411 data_resource.start = (unsigned long) &_etext; 412 data_resource.end = (unsigned long) &_edata - 1; 413 bss_resource.start = (unsigned long) &__bss_start; 414 bss_resource.end = (unsigned long) &__bss_stop - 1; 415 416 for_each_memblock(memory, reg) { 417 res = alloc_bootmem_low(sizeof(*res)); 418 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 419 420 res->name = "System RAM"; 421 res->start = reg->base; 422 res->end = reg->base + reg->size - 1; 423 request_resource(&iomem_resource, res); 424 425 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 426 std_res = standard_resources[j]; 427 if (std_res->start < res->start || 428 std_res->start > res->end) 429 continue; 430 if (std_res->end > res->end) { 431 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 432 *sub_res = *std_res; 433 sub_res->end = res->end; 434 std_res->start = res->end + 1; 435 request_resource(res, sub_res); 436 } else { 437 request_resource(res, std_res); 438 } 439 } 440 } 441 #ifdef CONFIG_CRASH_DUMP 442 /* 443 * Re-add removed crash kernel memory as reserved memory. This makes 444 * sure it will be mapped with the identity mapping and struct pages 445 * will be created, so it can be resized later on. 446 * However add it later since the crash kernel resource should not be 447 * part of the System RAM resource. 448 */ 449 if (crashk_res.end) { 450 memblock_add(crashk_res.start, resource_size(&crashk_res)); 451 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 452 insert_resource(&iomem_resource, &crashk_res); 453 } 454 #endif 455 } 456 457 static void __init setup_memory_end(void) 458 { 459 unsigned long vmax, vmalloc_size, tmp; 460 461 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 462 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 463 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 464 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 465 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42)) 466 vmax = 1UL << 42; /* 3-level kernel page table */ 467 else 468 vmax = 1UL << 53; /* 4-level kernel page table */ 469 /* module area is at the end of the kernel address space. */ 470 MODULES_END = vmax; 471 MODULES_VADDR = MODULES_END - MODULES_LEN; 472 VMALLOC_END = MODULES_VADDR; 473 VMALLOC_START = vmax - vmalloc_size; 474 475 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 476 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 477 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 478 tmp = SECTION_ALIGN_UP(tmp); 479 tmp = VMALLOC_START - tmp * sizeof(struct page); 480 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 481 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 482 vmemmap = (struct page *) tmp; 483 484 /* Take care that memory_end is set and <= vmemmap */ 485 memory_end = min(memory_end ?: max_physmem_end, tmp); 486 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 487 memblock_remove(memory_end, ULONG_MAX); 488 489 pr_notice("Max memory size: %luMB\n", memory_end >> 20); 490 } 491 492 static void __init setup_vmcoreinfo(void) 493 { 494 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 495 } 496 497 #ifdef CONFIG_CRASH_DUMP 498 499 /* 500 * When kdump is enabled, we have to ensure that no memory from 501 * the area [0 - crashkernel memory size] and 502 * [crashk_res.start - crashk_res.end] is set offline. 503 */ 504 static int kdump_mem_notifier(struct notifier_block *nb, 505 unsigned long action, void *data) 506 { 507 struct memory_notify *arg = data; 508 509 if (action != MEM_GOING_OFFLINE) 510 return NOTIFY_OK; 511 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 512 return NOTIFY_BAD; 513 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 514 return NOTIFY_OK; 515 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 516 return NOTIFY_OK; 517 return NOTIFY_BAD; 518 } 519 520 static struct notifier_block kdump_mem_nb = { 521 .notifier_call = kdump_mem_notifier, 522 }; 523 524 #endif 525 526 /* 527 * Make sure that the area behind memory_end is protected 528 */ 529 static void reserve_memory_end(void) 530 { 531 #ifdef CONFIG_CRASH_DUMP 532 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 533 !OLDMEM_BASE && sclp.hsa_size) { 534 memory_end = sclp.hsa_size; 535 memory_end &= PAGE_MASK; 536 memory_end_set = 1; 537 } 538 #endif 539 if (!memory_end_set) 540 return; 541 memblock_reserve(memory_end, ULONG_MAX); 542 } 543 544 /* 545 * Make sure that oldmem, where the dump is stored, is protected 546 */ 547 static void reserve_oldmem(void) 548 { 549 #ifdef CONFIG_CRASH_DUMP 550 if (OLDMEM_BASE) 551 /* Forget all memory above the running kdump system */ 552 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 553 #endif 554 } 555 556 /* 557 * Make sure that oldmem, where the dump is stored, is protected 558 */ 559 static void remove_oldmem(void) 560 { 561 #ifdef CONFIG_CRASH_DUMP 562 if (OLDMEM_BASE) 563 /* Forget all memory above the running kdump system */ 564 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 565 #endif 566 } 567 568 /* 569 * Reserve memory for kdump kernel to be loaded with kexec 570 */ 571 static void __init reserve_crashkernel(void) 572 { 573 #ifdef CONFIG_CRASH_DUMP 574 unsigned long long crash_base, crash_size; 575 phys_addr_t low, high; 576 int rc; 577 578 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 579 &crash_base); 580 581 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 582 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 583 if (rc || crash_size == 0) 584 return; 585 586 if (memblock.memory.regions[0].size < crash_size) { 587 pr_info("crashkernel reservation failed: %s\n", 588 "first memory chunk must be at least crashkernel size"); 589 return; 590 } 591 592 low = crash_base ?: OLDMEM_BASE; 593 high = low + crash_size; 594 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 595 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 596 crash_base = low; 597 } else { 598 /* Find suitable area in free memory */ 599 low = max_t(unsigned long, crash_size, sclp.hsa_size); 600 high = crash_base ? crash_base + crash_size : ULONG_MAX; 601 602 if (crash_base && crash_base < low) { 603 pr_info("crashkernel reservation failed: %s\n", 604 "crash_base too low"); 605 return; 606 } 607 low = crash_base ?: low; 608 crash_base = memblock_find_in_range(low, high, crash_size, 609 KEXEC_CRASH_MEM_ALIGN); 610 } 611 612 if (!crash_base) { 613 pr_info("crashkernel reservation failed: %s\n", 614 "no suitable area found"); 615 return; 616 } 617 618 if (register_memory_notifier(&kdump_mem_nb)) 619 return; 620 621 if (!OLDMEM_BASE && MACHINE_IS_VM) 622 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 623 crashk_res.start = crash_base; 624 crashk_res.end = crash_base + crash_size - 1; 625 memblock_remove(crash_base, crash_size); 626 pr_info("Reserving %lluMB of memory at %lluMB " 627 "for crashkernel (System RAM: %luMB)\n", 628 crash_size >> 20, crash_base >> 20, 629 (unsigned long)memblock.memory.total_size >> 20); 630 os_info_crashkernel_add(crash_base, crash_size); 631 #endif 632 } 633 634 /* 635 * Reserve the initrd from being used by memblock 636 */ 637 static void __init reserve_initrd(void) 638 { 639 #ifdef CONFIG_BLK_DEV_INITRD 640 initrd_start = INITRD_START; 641 initrd_end = initrd_start + INITRD_SIZE; 642 memblock_reserve(INITRD_START, INITRD_SIZE); 643 #endif 644 } 645 646 /* 647 * Check for initrd being in usable memory 648 */ 649 static void __init check_initrd(void) 650 { 651 #ifdef CONFIG_BLK_DEV_INITRD 652 if (INITRD_START && INITRD_SIZE && 653 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 654 pr_err("initrd does not fit memory.\n"); 655 memblock_free(INITRD_START, INITRD_SIZE); 656 initrd_start = initrd_end = 0; 657 } 658 #endif 659 } 660 661 /* 662 * Reserve memory used for lowcore/command line/kernel image. 663 */ 664 static void __init reserve_kernel(void) 665 { 666 unsigned long start_pfn = PFN_UP(__pa(&_end)); 667 668 #ifdef CONFIG_DMA_API_DEBUG 669 /* 670 * DMA_API_DEBUG code stumbles over addresses from the 671 * range [_ehead, _stext]. Mark the memory as reserved 672 * so it is not used for CONFIG_DMA_API_DEBUG=y. 673 */ 674 memblock_reserve(0, PFN_PHYS(start_pfn)); 675 #else 676 memblock_reserve(0, (unsigned long)_ehead); 677 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 678 - (unsigned long)_stext); 679 #endif 680 } 681 682 static void __init setup_memory(void) 683 { 684 struct memblock_region *reg; 685 686 /* 687 * Init storage key for present memory 688 */ 689 for_each_memblock(memory, reg) { 690 storage_key_init_range(reg->base, reg->base + reg->size); 691 } 692 psw_set_key(PAGE_DEFAULT_KEY); 693 694 /* Only cosmetics */ 695 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 696 } 697 698 /* 699 * Setup hardware capabilities. 700 */ 701 static int __init setup_hwcaps(void) 702 { 703 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 704 struct cpuid cpu_id; 705 int i; 706 707 /* 708 * The store facility list bits numbers as found in the principles 709 * of operation are numbered with bit 1UL<<31 as number 0 to 710 * bit 1UL<<0 as number 31. 711 * Bit 0: instructions named N3, "backported" to esa-mode 712 * Bit 2: z/Architecture mode is active 713 * Bit 7: the store-facility-list-extended facility is installed 714 * Bit 17: the message-security assist is installed 715 * Bit 19: the long-displacement facility is installed 716 * Bit 21: the extended-immediate facility is installed 717 * Bit 22: extended-translation facility 3 is installed 718 * Bit 30: extended-translation facility 3 enhancement facility 719 * These get translated to: 720 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 721 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 722 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 723 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 724 */ 725 for (i = 0; i < 6; i++) 726 if (test_facility(stfl_bits[i])) 727 elf_hwcap |= 1UL << i; 728 729 if (test_facility(22) && test_facility(30)) 730 elf_hwcap |= HWCAP_S390_ETF3EH; 731 732 /* 733 * Check for additional facilities with store-facility-list-extended. 734 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 735 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 736 * as stored by stfl, bits 32-xxx contain additional facilities. 737 * How many facility words are stored depends on the number of 738 * doublewords passed to the instruction. The additional facilities 739 * are: 740 * Bit 42: decimal floating point facility is installed 741 * Bit 44: perform floating point operation facility is installed 742 * translated to: 743 * HWCAP_S390_DFP bit 6 (42 && 44). 744 */ 745 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 746 elf_hwcap |= HWCAP_S390_DFP; 747 748 /* 749 * Huge page support HWCAP_S390_HPAGE is bit 7. 750 */ 751 if (MACHINE_HAS_HPAGE) 752 elf_hwcap |= HWCAP_S390_HPAGE; 753 754 /* 755 * 64-bit register support for 31-bit processes 756 * HWCAP_S390_HIGH_GPRS is bit 9. 757 */ 758 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 759 760 /* 761 * Transactional execution support HWCAP_S390_TE is bit 10. 762 */ 763 if (test_facility(50) && test_facility(73)) 764 elf_hwcap |= HWCAP_S390_TE; 765 766 /* 767 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 768 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 769 * instead of facility bit 129. 770 */ 771 if (MACHINE_HAS_VX) 772 elf_hwcap |= HWCAP_S390_VXRS; 773 get_cpu_id(&cpu_id); 774 add_device_randomness(&cpu_id, sizeof(cpu_id)); 775 switch (cpu_id.machine) { 776 case 0x2064: 777 case 0x2066: 778 default: /* Use "z900" as default for 64 bit kernels. */ 779 strcpy(elf_platform, "z900"); 780 break; 781 case 0x2084: 782 case 0x2086: 783 strcpy(elf_platform, "z990"); 784 break; 785 case 0x2094: 786 case 0x2096: 787 strcpy(elf_platform, "z9-109"); 788 break; 789 case 0x2097: 790 case 0x2098: 791 strcpy(elf_platform, "z10"); 792 break; 793 case 0x2817: 794 case 0x2818: 795 strcpy(elf_platform, "z196"); 796 break; 797 case 0x2827: 798 case 0x2828: 799 strcpy(elf_platform, "zEC12"); 800 break; 801 case 0x2964: 802 case 0x2965: 803 strcpy(elf_platform, "z13"); 804 break; 805 } 806 807 /* 808 * Virtualization support HWCAP_INT_SIE is bit 0. 809 */ 810 if (sclp.has_sief2) 811 int_hwcap |= HWCAP_INT_SIE; 812 813 return 0; 814 } 815 arch_initcall(setup_hwcaps); 816 817 /* 818 * Add system information as device randomness 819 */ 820 static void __init setup_randomness(void) 821 { 822 struct sysinfo_3_2_2 *vmms; 823 824 vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL); 825 if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count) 826 add_device_randomness(&vmms, vmms->count); 827 free_page((unsigned long) vmms); 828 } 829 830 /* 831 * Find the correct size for the task_struct. This depends on 832 * the size of the struct fpu at the end of the thread_struct 833 * which is embedded in the task_struct. 834 */ 835 static void __init setup_task_size(void) 836 { 837 int task_size = sizeof(struct task_struct); 838 839 if (!MACHINE_HAS_VX) { 840 task_size -= sizeof(__vector128) * __NUM_VXRS; 841 task_size += sizeof(freg_t) * __NUM_FPRS; 842 } 843 arch_task_struct_size = task_size; 844 } 845 846 /* 847 * Setup function called from init/main.c just after the banner 848 * was printed. 849 */ 850 851 void __init setup_arch(char **cmdline_p) 852 { 853 /* 854 * print what head.S has found out about the machine 855 */ 856 if (MACHINE_IS_VM) 857 pr_info("Linux is running as a z/VM " 858 "guest operating system in 64-bit mode\n"); 859 else if (MACHINE_IS_KVM) 860 pr_info("Linux is running under KVM in 64-bit mode\n"); 861 else if (MACHINE_IS_LPAR) 862 pr_info("Linux is running natively in 64-bit mode\n"); 863 864 /* Have one command line that is parsed and saved in /proc/cmdline */ 865 /* boot_command_line has been already set up in early.c */ 866 *cmdline_p = boot_command_line; 867 868 ROOT_DEV = Root_RAM0; 869 870 /* Is init_mm really needed? */ 871 init_mm.start_code = PAGE_OFFSET; 872 init_mm.end_code = (unsigned long) &_etext; 873 init_mm.end_data = (unsigned long) &_edata; 874 init_mm.brk = (unsigned long) &_end; 875 876 parse_early_param(); 877 #ifdef CONFIG_CRASH_DUMP 878 /* Deactivate elfcorehdr= kernel parameter */ 879 elfcorehdr_addr = ELFCORE_ADDR_MAX; 880 #endif 881 882 os_info_init(); 883 setup_ipl(); 884 setup_task_size(); 885 886 /* Do some memory reservations *before* memory is added to memblock */ 887 reserve_memory_end(); 888 reserve_oldmem(); 889 reserve_kernel(); 890 reserve_initrd(); 891 memblock_allow_resize(); 892 893 /* Get information about *all* installed memory */ 894 detect_memory_memblock(); 895 896 remove_oldmem(); 897 898 /* 899 * Make sure all chunks are MAX_ORDER aligned so we don't need the 900 * extra checks that HOLES_IN_ZONE would require. 901 * 902 * Is this still required? 903 */ 904 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 905 906 setup_memory_end(); 907 setup_memory(); 908 909 check_initrd(); 910 reserve_crashkernel(); 911 #ifdef CONFIG_CRASH_DUMP 912 /* 913 * Be aware that smp_save_dump_cpus() triggers a system reset. 914 * Therefore CPU and device initialization should be done afterwards. 915 */ 916 smp_save_dump_cpus(); 917 #endif 918 919 setup_resources(); 920 setup_vmcoreinfo(); 921 setup_lowcore(); 922 smp_fill_possible_mask(); 923 cpu_detect_mhz_feature(); 924 cpu_init(); 925 numa_setup(); 926 927 /* 928 * Create kernel page tables and switch to virtual addressing. 929 */ 930 paging_init(); 931 932 /* Setup default console */ 933 conmode_default(); 934 set_preferred_console(); 935 936 /* Setup zfcpdump support */ 937 setup_zfcpdump(); 938 939 /* Add system specific data to the random pool */ 940 setup_randomness(); 941 } 942