1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * S390 version 4 * Copyright IBM Corp. 1999, 2012 5 * Author(s): Hartmut Penner (hp@de.ibm.com), 6 * Martin Schwidefsky (schwidefsky@de.ibm.com) 7 * 8 * Derived from "arch/i386/kernel/setup.c" 9 * Copyright (C) 1995, Linus Torvalds 10 */ 11 12 /* 13 * This file handles the architecture-dependent parts of initialization 14 */ 15 16 #define KMSG_COMPONENT "setup" 17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 18 19 #include <linux/errno.h> 20 #include <linux/export.h> 21 #include <linux/sched.h> 22 #include <linux/sched/task.h> 23 #include <linux/cpu.h> 24 #include <linux/kernel.h> 25 #include <linux/memblock.h> 26 #include <linux/mm.h> 27 #include <linux/stddef.h> 28 #include <linux/unistd.h> 29 #include <linux/ptrace.h> 30 #include <linux/random.h> 31 #include <linux/user.h> 32 #include <linux/tty.h> 33 #include <linux/ioport.h> 34 #include <linux/delay.h> 35 #include <linux/init.h> 36 #include <linux/initrd.h> 37 #include <linux/bootmem.h> 38 #include <linux/root_dev.h> 39 #include <linux/console.h> 40 #include <linux/kernel_stat.h> 41 #include <linux/dma-contiguous.h> 42 #include <linux/device.h> 43 #include <linux/notifier.h> 44 #include <linux/pfn.h> 45 #include <linux/ctype.h> 46 #include <linux/reboot.h> 47 #include <linux/topology.h> 48 #include <linux/kexec.h> 49 #include <linux/crash_dump.h> 50 #include <linux/memory.h> 51 #include <linux/compat.h> 52 53 #include <asm/ipl.h> 54 #include <asm/facility.h> 55 #include <asm/smp.h> 56 #include <asm/mmu_context.h> 57 #include <asm/cpcmd.h> 58 #include <asm/lowcore.h> 59 #include <asm/nmi.h> 60 #include <asm/irq.h> 61 #include <asm/page.h> 62 #include <asm/ptrace.h> 63 #include <asm/sections.h> 64 #include <asm/ebcdic.h> 65 #include <asm/diag.h> 66 #include <asm/os_info.h> 67 #include <asm/sclp.h> 68 #include <asm/sysinfo.h> 69 #include <asm/numa.h> 70 #include <asm/alternative.h> 71 #include "entry.h" 72 73 /* 74 * Machine setup.. 75 */ 76 unsigned int console_mode = 0; 77 EXPORT_SYMBOL(console_mode); 78 79 unsigned int console_devno = -1; 80 EXPORT_SYMBOL(console_devno); 81 82 unsigned int console_irq = -1; 83 EXPORT_SYMBOL(console_irq); 84 85 unsigned long elf_hwcap __read_mostly = 0; 86 char elf_platform[ELF_PLATFORM_SIZE]; 87 88 unsigned long int_hwcap = 0; 89 90 int __initdata memory_end_set; 91 unsigned long __initdata memory_end; 92 unsigned long __initdata max_physmem_end; 93 94 unsigned long VMALLOC_START; 95 EXPORT_SYMBOL(VMALLOC_START); 96 97 unsigned long VMALLOC_END; 98 EXPORT_SYMBOL(VMALLOC_END); 99 100 struct page *vmemmap; 101 EXPORT_SYMBOL(vmemmap); 102 103 unsigned long MODULES_VADDR; 104 unsigned long MODULES_END; 105 106 /* An array with a pointer to the lowcore of every CPU. */ 107 struct lowcore *lowcore_ptr[NR_CPUS]; 108 EXPORT_SYMBOL(lowcore_ptr); 109 110 /* 111 * This is set up by the setup-routine at boot-time 112 * for S390 need to find out, what we have to setup 113 * using address 0x10400 ... 114 */ 115 116 #include <asm/setup.h> 117 118 /* 119 * condev= and conmode= setup parameter. 120 */ 121 122 static int __init condev_setup(char *str) 123 { 124 int vdev; 125 126 vdev = simple_strtoul(str, &str, 0); 127 if (vdev >= 0 && vdev < 65536) { 128 console_devno = vdev; 129 console_irq = -1; 130 } 131 return 1; 132 } 133 134 __setup("condev=", condev_setup); 135 136 static void __init set_preferred_console(void) 137 { 138 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 139 add_preferred_console("ttyS", 0, NULL); 140 else if (CONSOLE_IS_3270) 141 add_preferred_console("tty3270", 0, NULL); 142 else if (CONSOLE_IS_VT220) 143 add_preferred_console("ttyS", 1, NULL); 144 else if (CONSOLE_IS_HVC) 145 add_preferred_console("hvc", 0, NULL); 146 } 147 148 static int __init conmode_setup(char *str) 149 { 150 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 151 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 152 SET_CONSOLE_SCLP; 153 #endif 154 #if defined(CONFIG_TN3215_CONSOLE) 155 if (strncmp(str, "3215", 5) == 0) 156 SET_CONSOLE_3215; 157 #endif 158 #if defined(CONFIG_TN3270_CONSOLE) 159 if (strncmp(str, "3270", 5) == 0) 160 SET_CONSOLE_3270; 161 #endif 162 set_preferred_console(); 163 return 1; 164 } 165 166 __setup("conmode=", conmode_setup); 167 168 static void __init conmode_default(void) 169 { 170 char query_buffer[1024]; 171 char *ptr; 172 173 if (MACHINE_IS_VM) { 174 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 175 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 176 ptr = strstr(query_buffer, "SUBCHANNEL ="); 177 console_irq = simple_strtoul(ptr + 13, NULL, 16); 178 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 179 ptr = strstr(query_buffer, "CONMODE"); 180 /* 181 * Set the conmode to 3215 so that the device recognition 182 * will set the cu_type of the console to 3215. If the 183 * conmode is 3270 and we don't set it back then both 184 * 3215 and the 3270 driver will try to access the console 185 * device (3215 as console and 3270 as normal tty). 186 */ 187 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 188 if (ptr == NULL) { 189 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 190 SET_CONSOLE_SCLP; 191 #endif 192 return; 193 } 194 if (strncmp(ptr + 8, "3270", 4) == 0) { 195 #if defined(CONFIG_TN3270_CONSOLE) 196 SET_CONSOLE_3270; 197 #elif defined(CONFIG_TN3215_CONSOLE) 198 SET_CONSOLE_3215; 199 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 200 SET_CONSOLE_SCLP; 201 #endif 202 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 203 #if defined(CONFIG_TN3215_CONSOLE) 204 SET_CONSOLE_3215; 205 #elif defined(CONFIG_TN3270_CONSOLE) 206 SET_CONSOLE_3270; 207 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 208 SET_CONSOLE_SCLP; 209 #endif 210 } 211 } else if (MACHINE_IS_KVM) { 212 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 213 SET_CONSOLE_VT220; 214 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 215 SET_CONSOLE_SCLP; 216 else 217 SET_CONSOLE_HVC; 218 } else { 219 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 220 SET_CONSOLE_SCLP; 221 #endif 222 } 223 } 224 225 #ifdef CONFIG_CRASH_DUMP 226 static void __init setup_zfcpdump(void) 227 { 228 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 229 return; 230 if (OLDMEM_BASE) 231 return; 232 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 233 console_loglevel = 2; 234 } 235 #else 236 static inline void setup_zfcpdump(void) {} 237 #endif /* CONFIG_CRASH_DUMP */ 238 239 /* 240 * Reboot, halt and power_off stubs. They just call _machine_restart, 241 * _machine_halt or _machine_power_off. 242 */ 243 244 void machine_restart(char *command) 245 { 246 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 247 /* 248 * Only unblank the console if we are called in enabled 249 * context or a bust_spinlocks cleared the way for us. 250 */ 251 console_unblank(); 252 _machine_restart(command); 253 } 254 255 void machine_halt(void) 256 { 257 if (!in_interrupt() || oops_in_progress) 258 /* 259 * Only unblank the console if we are called in enabled 260 * context or a bust_spinlocks cleared the way for us. 261 */ 262 console_unblank(); 263 _machine_halt(); 264 } 265 266 void machine_power_off(void) 267 { 268 if (!in_interrupt() || oops_in_progress) 269 /* 270 * Only unblank the console if we are called in enabled 271 * context or a bust_spinlocks cleared the way for us. 272 */ 273 console_unblank(); 274 _machine_power_off(); 275 } 276 277 /* 278 * Dummy power off function. 279 */ 280 void (*pm_power_off)(void) = machine_power_off; 281 EXPORT_SYMBOL_GPL(pm_power_off); 282 283 static int __init early_parse_mem(char *p) 284 { 285 memory_end = memparse(p, &p); 286 memory_end &= PAGE_MASK; 287 memory_end_set = 1; 288 return 0; 289 } 290 early_param("mem", early_parse_mem); 291 292 static int __init parse_vmalloc(char *arg) 293 { 294 if (!arg) 295 return -EINVAL; 296 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 297 return 0; 298 } 299 early_param("vmalloc", parse_vmalloc); 300 301 void *restart_stack __section(.data); 302 303 static void __init setup_lowcore(void) 304 { 305 struct lowcore *lc; 306 307 /* 308 * Setup lowcore for boot cpu 309 */ 310 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 311 lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc)); 312 lc->restart_psw.mask = PSW_KERNEL_BITS; 313 lc->restart_psw.addr = (unsigned long) restart_int_handler; 314 lc->external_new_psw.mask = PSW_KERNEL_BITS | 315 PSW_MASK_DAT | PSW_MASK_MCHECK; 316 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 317 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 318 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 319 lc->svc_new_psw.addr = (unsigned long) system_call; 320 lc->program_new_psw.mask = PSW_KERNEL_BITS | 321 PSW_MASK_DAT | PSW_MASK_MCHECK; 322 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 323 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 324 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 325 lc->io_new_psw.mask = PSW_KERNEL_BITS | 326 PSW_MASK_DAT | PSW_MASK_MCHECK; 327 lc->io_new_psw.addr = (unsigned long) io_int_handler; 328 lc->clock_comparator = clock_comparator_max; 329 lc->kernel_stack = ((unsigned long) &init_thread_union) 330 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 331 lc->async_stack = (unsigned long) 332 memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE) 333 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 334 lc->panic_stack = (unsigned long) 335 memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE) 336 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 337 lc->current_task = (unsigned long)&init_task; 338 lc->lpp = LPP_MAGIC; 339 lc->machine_flags = S390_lowcore.machine_flags; 340 lc->preempt_count = S390_lowcore.preempt_count; 341 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 342 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 343 MAX_FACILITY_BIT/8); 344 nmi_alloc_boot_cpu(lc); 345 vdso_alloc_boot_cpu(lc); 346 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 347 lc->async_enter_timer = S390_lowcore.async_enter_timer; 348 lc->exit_timer = S390_lowcore.exit_timer; 349 lc->user_timer = S390_lowcore.user_timer; 350 lc->system_timer = S390_lowcore.system_timer; 351 lc->steal_timer = S390_lowcore.steal_timer; 352 lc->last_update_timer = S390_lowcore.last_update_timer; 353 lc->last_update_clock = S390_lowcore.last_update_clock; 354 355 restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE); 356 restart_stack += ASYNC_SIZE; 357 358 /* 359 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 360 * restart data to the absolute zero lowcore. This is necessary if 361 * PSW restart is done on an offline CPU that has lowcore zero. 362 */ 363 lc->restart_stack = (unsigned long) restart_stack; 364 lc->restart_fn = (unsigned long) do_restart; 365 lc->restart_data = 0; 366 lc->restart_source = -1UL; 367 368 /* Setup absolute zero lowcore */ 369 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 370 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 371 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 372 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 373 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 374 375 #ifdef CONFIG_SMP 376 lc->spinlock_lockval = arch_spin_lockval(0); 377 lc->spinlock_index = 0; 378 arch_spin_lock_setup(0); 379 #endif 380 381 set_prefix((u32)(unsigned long) lc); 382 lowcore_ptr[0] = lc; 383 } 384 385 static struct resource code_resource = { 386 .name = "Kernel code", 387 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 388 }; 389 390 static struct resource data_resource = { 391 .name = "Kernel data", 392 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 393 }; 394 395 static struct resource bss_resource = { 396 .name = "Kernel bss", 397 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 398 }; 399 400 static struct resource __initdata *standard_resources[] = { 401 &code_resource, 402 &data_resource, 403 &bss_resource, 404 }; 405 406 static void __init setup_resources(void) 407 { 408 struct resource *res, *std_res, *sub_res; 409 struct memblock_region *reg; 410 int j; 411 412 code_resource.start = (unsigned long) &_text; 413 code_resource.end = (unsigned long) &_etext - 1; 414 data_resource.start = (unsigned long) &_etext; 415 data_resource.end = (unsigned long) &_edata - 1; 416 bss_resource.start = (unsigned long) &__bss_start; 417 bss_resource.end = (unsigned long) &__bss_stop - 1; 418 419 for_each_memblock(memory, reg) { 420 res = memblock_virt_alloc(sizeof(*res), 8); 421 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 422 423 res->name = "System RAM"; 424 res->start = reg->base; 425 res->end = reg->base + reg->size - 1; 426 request_resource(&iomem_resource, res); 427 428 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 429 std_res = standard_resources[j]; 430 if (std_res->start < res->start || 431 std_res->start > res->end) 432 continue; 433 if (std_res->end > res->end) { 434 sub_res = memblock_virt_alloc(sizeof(*sub_res), 8); 435 *sub_res = *std_res; 436 sub_res->end = res->end; 437 std_res->start = res->end + 1; 438 request_resource(res, sub_res); 439 } else { 440 request_resource(res, std_res); 441 } 442 } 443 } 444 #ifdef CONFIG_CRASH_DUMP 445 /* 446 * Re-add removed crash kernel memory as reserved memory. This makes 447 * sure it will be mapped with the identity mapping and struct pages 448 * will be created, so it can be resized later on. 449 * However add it later since the crash kernel resource should not be 450 * part of the System RAM resource. 451 */ 452 if (crashk_res.end) { 453 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); 454 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 455 insert_resource(&iomem_resource, &crashk_res); 456 } 457 #endif 458 } 459 460 static void __init setup_memory_end(void) 461 { 462 unsigned long vmax, vmalloc_size, tmp; 463 464 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 465 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 466 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 467 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 468 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) 469 vmax = _REGION2_SIZE; /* 3-level kernel page table */ 470 else 471 vmax = _REGION1_SIZE; /* 4-level kernel page table */ 472 /* module area is at the end of the kernel address space. */ 473 MODULES_END = vmax; 474 MODULES_VADDR = MODULES_END - MODULES_LEN; 475 VMALLOC_END = MODULES_VADDR; 476 VMALLOC_START = vmax - vmalloc_size; 477 478 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 479 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 480 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 481 tmp = SECTION_ALIGN_UP(tmp); 482 tmp = VMALLOC_START - tmp * sizeof(struct page); 483 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 484 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 485 vmemmap = (struct page *) tmp; 486 487 /* Take care that memory_end is set and <= vmemmap */ 488 memory_end = min(memory_end ?: max_physmem_end, tmp); 489 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 490 memblock_remove(memory_end, ULONG_MAX); 491 492 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20); 493 } 494 495 #ifdef CONFIG_CRASH_DUMP 496 497 /* 498 * When kdump is enabled, we have to ensure that no memory from 499 * the area [0 - crashkernel memory size] and 500 * [crashk_res.start - crashk_res.end] is set offline. 501 */ 502 static int kdump_mem_notifier(struct notifier_block *nb, 503 unsigned long action, void *data) 504 { 505 struct memory_notify *arg = data; 506 507 if (action != MEM_GOING_OFFLINE) 508 return NOTIFY_OK; 509 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 510 return NOTIFY_BAD; 511 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 512 return NOTIFY_OK; 513 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 514 return NOTIFY_OK; 515 return NOTIFY_BAD; 516 } 517 518 static struct notifier_block kdump_mem_nb = { 519 .notifier_call = kdump_mem_notifier, 520 }; 521 522 #endif 523 524 /* 525 * Make sure that the area behind memory_end is protected 526 */ 527 static void reserve_memory_end(void) 528 { 529 #ifdef CONFIG_CRASH_DUMP 530 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 531 !OLDMEM_BASE && sclp.hsa_size) { 532 memory_end = sclp.hsa_size; 533 memory_end &= PAGE_MASK; 534 memory_end_set = 1; 535 } 536 #endif 537 if (!memory_end_set) 538 return; 539 memblock_reserve(memory_end, ULONG_MAX); 540 } 541 542 /* 543 * Make sure that oldmem, where the dump is stored, is protected 544 */ 545 static void reserve_oldmem(void) 546 { 547 #ifdef CONFIG_CRASH_DUMP 548 if (OLDMEM_BASE) 549 /* Forget all memory above the running kdump system */ 550 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 551 #endif 552 } 553 554 /* 555 * Make sure that oldmem, where the dump is stored, is protected 556 */ 557 static void remove_oldmem(void) 558 { 559 #ifdef CONFIG_CRASH_DUMP 560 if (OLDMEM_BASE) 561 /* Forget all memory above the running kdump system */ 562 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 563 #endif 564 } 565 566 /* 567 * Reserve memory for kdump kernel to be loaded with kexec 568 */ 569 static void __init reserve_crashkernel(void) 570 { 571 #ifdef CONFIG_CRASH_DUMP 572 unsigned long long crash_base, crash_size; 573 phys_addr_t low, high; 574 int rc; 575 576 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 577 &crash_base); 578 579 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 580 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 581 if (rc || crash_size == 0) 582 return; 583 584 if (memblock.memory.regions[0].size < crash_size) { 585 pr_info("crashkernel reservation failed: %s\n", 586 "first memory chunk must be at least crashkernel size"); 587 return; 588 } 589 590 low = crash_base ?: OLDMEM_BASE; 591 high = low + crash_size; 592 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 593 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 594 crash_base = low; 595 } else { 596 /* Find suitable area in free memory */ 597 low = max_t(unsigned long, crash_size, sclp.hsa_size); 598 high = crash_base ? crash_base + crash_size : ULONG_MAX; 599 600 if (crash_base && crash_base < low) { 601 pr_info("crashkernel reservation failed: %s\n", 602 "crash_base too low"); 603 return; 604 } 605 low = crash_base ?: low; 606 crash_base = memblock_find_in_range(low, high, crash_size, 607 KEXEC_CRASH_MEM_ALIGN); 608 } 609 610 if (!crash_base) { 611 pr_info("crashkernel reservation failed: %s\n", 612 "no suitable area found"); 613 return; 614 } 615 616 if (register_memory_notifier(&kdump_mem_nb)) 617 return; 618 619 if (!OLDMEM_BASE && MACHINE_IS_VM) 620 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 621 crashk_res.start = crash_base; 622 crashk_res.end = crash_base + crash_size - 1; 623 memblock_remove(crash_base, crash_size); 624 pr_info("Reserving %lluMB of memory at %lluMB " 625 "for crashkernel (System RAM: %luMB)\n", 626 crash_size >> 20, crash_base >> 20, 627 (unsigned long)memblock.memory.total_size >> 20); 628 os_info_crashkernel_add(crash_base, crash_size); 629 #endif 630 } 631 632 /* 633 * Reserve the initrd from being used by memblock 634 */ 635 static void __init reserve_initrd(void) 636 { 637 #ifdef CONFIG_BLK_DEV_INITRD 638 if (!INITRD_START || !INITRD_SIZE) 639 return; 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("The initial RAM disk does not fit into the 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_EDAT1) 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 (MACHINE_HAS_TE) 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 if (test_facility(134)) 774 elf_hwcap |= HWCAP_S390_VXRS_EXT; 775 if (test_facility(135)) 776 elf_hwcap |= HWCAP_S390_VXRS_BCD; 777 } 778 779 /* 780 * Guarded storage support HWCAP_S390_GS is bit 12. 781 */ 782 if (MACHINE_HAS_GS) 783 elf_hwcap |= HWCAP_S390_GS; 784 785 get_cpu_id(&cpu_id); 786 add_device_randomness(&cpu_id, sizeof(cpu_id)); 787 switch (cpu_id.machine) { 788 case 0x2064: 789 case 0x2066: 790 default: /* Use "z900" as default for 64 bit kernels. */ 791 strcpy(elf_platform, "z900"); 792 break; 793 case 0x2084: 794 case 0x2086: 795 strcpy(elf_platform, "z990"); 796 break; 797 case 0x2094: 798 case 0x2096: 799 strcpy(elf_platform, "z9-109"); 800 break; 801 case 0x2097: 802 case 0x2098: 803 strcpy(elf_platform, "z10"); 804 break; 805 case 0x2817: 806 case 0x2818: 807 strcpy(elf_platform, "z196"); 808 break; 809 case 0x2827: 810 case 0x2828: 811 strcpy(elf_platform, "zEC12"); 812 break; 813 case 0x2964: 814 case 0x2965: 815 strcpy(elf_platform, "z13"); 816 break; 817 case 0x3906: 818 strcpy(elf_platform, "z14"); 819 break; 820 } 821 822 /* 823 * Virtualization support HWCAP_INT_SIE is bit 0. 824 */ 825 if (sclp.has_sief2) 826 int_hwcap |= HWCAP_INT_SIE; 827 828 return 0; 829 } 830 arch_initcall(setup_hwcaps); 831 832 /* 833 * Add system information as device randomness 834 */ 835 static void __init setup_randomness(void) 836 { 837 struct sysinfo_3_2_2 *vmms; 838 839 vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE); 840 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 841 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 842 memblock_free((unsigned long) vmms, PAGE_SIZE); 843 } 844 845 /* 846 * Find the correct size for the task_struct. This depends on 847 * the size of the struct fpu at the end of the thread_struct 848 * which is embedded in the task_struct. 849 */ 850 static void __init setup_task_size(void) 851 { 852 int task_size = sizeof(struct task_struct); 853 854 if (!MACHINE_HAS_VX) { 855 task_size -= sizeof(__vector128) * __NUM_VXRS; 856 task_size += sizeof(freg_t) * __NUM_FPRS; 857 } 858 arch_task_struct_size = task_size; 859 } 860 861 /* 862 * Setup function called from init/main.c just after the banner 863 * was printed. 864 */ 865 866 void __init setup_arch(char **cmdline_p) 867 { 868 /* 869 * print what head.S has found out about the machine 870 */ 871 if (MACHINE_IS_VM) 872 pr_info("Linux is running as a z/VM " 873 "guest operating system in 64-bit mode\n"); 874 else if (MACHINE_IS_KVM) 875 pr_info("Linux is running under KVM in 64-bit mode\n"); 876 else if (MACHINE_IS_LPAR) 877 pr_info("Linux is running natively in 64-bit mode\n"); 878 879 /* Have one command line that is parsed and saved in /proc/cmdline */ 880 /* boot_command_line has been already set up in early.c */ 881 *cmdline_p = boot_command_line; 882 883 ROOT_DEV = Root_RAM0; 884 885 /* Is init_mm really needed? */ 886 init_mm.start_code = PAGE_OFFSET; 887 init_mm.end_code = (unsigned long) &_etext; 888 init_mm.end_data = (unsigned long) &_edata; 889 init_mm.brk = (unsigned long) &_end; 890 891 parse_early_param(); 892 #ifdef CONFIG_CRASH_DUMP 893 /* Deactivate elfcorehdr= kernel parameter */ 894 elfcorehdr_addr = ELFCORE_ADDR_MAX; 895 #endif 896 897 os_info_init(); 898 setup_ipl(); 899 setup_task_size(); 900 901 /* Do some memory reservations *before* memory is added to memblock */ 902 reserve_memory_end(); 903 reserve_oldmem(); 904 reserve_kernel(); 905 reserve_initrd(); 906 memblock_allow_resize(); 907 908 /* Get information about *all* installed memory */ 909 detect_memory_memblock(); 910 911 remove_oldmem(); 912 913 /* 914 * Make sure all chunks are MAX_ORDER aligned so we don't need the 915 * extra checks that HOLES_IN_ZONE would require. 916 * 917 * Is this still required? 918 */ 919 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 920 921 setup_memory_end(); 922 setup_memory(); 923 dma_contiguous_reserve(memory_end); 924 vmcp_cma_reserve(); 925 926 check_initrd(); 927 reserve_crashkernel(); 928 #ifdef CONFIG_CRASH_DUMP 929 /* 930 * Be aware that smp_save_dump_cpus() triggers a system reset. 931 * Therefore CPU and device initialization should be done afterwards. 932 */ 933 smp_save_dump_cpus(); 934 #endif 935 936 setup_resources(); 937 setup_lowcore(); 938 smp_fill_possible_mask(); 939 cpu_detect_mhz_feature(); 940 cpu_init(); 941 numa_setup(); 942 smp_detect_cpus(); 943 topology_init_early(); 944 945 /* 946 * Create kernel page tables and switch to virtual addressing. 947 */ 948 paging_init(); 949 950 /* Setup default console */ 951 conmode_default(); 952 set_preferred_console(); 953 954 apply_alternative_instructions(); 955 956 /* Setup zfcpdump support */ 957 setup_zfcpdump(); 958 959 /* Add system specific data to the random pool */ 960 setup_randomness(); 961 } 962