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/root_dev.h> 38 #include <linux/console.h> 39 #include <linux/kernel_stat.h> 40 #include <linux/dma-contiguous.h> 41 #include <linux/device.h> 42 #include <linux/notifier.h> 43 #include <linux/pfn.h> 44 #include <linux/ctype.h> 45 #include <linux/reboot.h> 46 #include <linux/topology.h> 47 #include <linux/kexec.h> 48 #include <linux/crash_dump.h> 49 #include <linux/memory.h> 50 #include <linux/compat.h> 51 #include <linux/start_kernel.h> 52 53 #include <asm/boot_data.h> 54 #include <asm/ipl.h> 55 #include <asm/facility.h> 56 #include <asm/smp.h> 57 #include <asm/mmu_context.h> 58 #include <asm/cpcmd.h> 59 #include <asm/lowcore.h> 60 #include <asm/nmi.h> 61 #include <asm/irq.h> 62 #include <asm/page.h> 63 #include <asm/ptrace.h> 64 #include <asm/sections.h> 65 #include <asm/ebcdic.h> 66 #include <asm/diag.h> 67 #include <asm/os_info.h> 68 #include <asm/sclp.h> 69 #include <asm/stacktrace.h> 70 #include <asm/sysinfo.h> 71 #include <asm/numa.h> 72 #include <asm/alternative.h> 73 #include <asm/nospec-branch.h> 74 #include <asm/mem_detect.h> 75 #include <asm/uv.h> 76 #include "entry.h" 77 78 /* 79 * Machine setup.. 80 */ 81 unsigned int console_mode = 0; 82 EXPORT_SYMBOL(console_mode); 83 84 unsigned int console_devno = -1; 85 EXPORT_SYMBOL(console_devno); 86 87 unsigned int console_irq = -1; 88 EXPORT_SYMBOL(console_irq); 89 90 unsigned long elf_hwcap __read_mostly = 0; 91 char elf_platform[ELF_PLATFORM_SIZE]; 92 93 unsigned long int_hwcap = 0; 94 95 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST 96 int __bootdata_preserved(prot_virt_guest); 97 #endif 98 99 int __bootdata(noexec_disabled); 100 int __bootdata(memory_end_set); 101 unsigned long __bootdata(memory_end); 102 unsigned long __bootdata(vmalloc_size); 103 unsigned long __bootdata(max_physmem_end); 104 struct mem_detect_info __bootdata(mem_detect); 105 106 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table); 107 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table); 108 unsigned long __bootdata_preserved(__swsusp_reset_dma); 109 unsigned long __bootdata_preserved(__stext_dma); 110 unsigned long __bootdata_preserved(__etext_dma); 111 unsigned long __bootdata_preserved(__sdma); 112 unsigned long __bootdata_preserved(__edma); 113 unsigned long __bootdata_preserved(__kaslr_offset); 114 115 unsigned long VMALLOC_START; 116 EXPORT_SYMBOL(VMALLOC_START); 117 118 unsigned long VMALLOC_END; 119 EXPORT_SYMBOL(VMALLOC_END); 120 121 struct page *vmemmap; 122 EXPORT_SYMBOL(vmemmap); 123 124 unsigned long MODULES_VADDR; 125 unsigned long MODULES_END; 126 127 /* An array with a pointer to the lowcore of every CPU. */ 128 struct lowcore *lowcore_ptr[NR_CPUS]; 129 EXPORT_SYMBOL(lowcore_ptr); 130 131 /* 132 * This is set up by the setup-routine at boot-time 133 * for S390 need to find out, what we have to setup 134 * using address 0x10400 ... 135 */ 136 137 #include <asm/setup.h> 138 139 /* 140 * condev= and conmode= setup parameter. 141 */ 142 143 static int __init condev_setup(char *str) 144 { 145 int vdev; 146 147 vdev = simple_strtoul(str, &str, 0); 148 if (vdev >= 0 && vdev < 65536) { 149 console_devno = vdev; 150 console_irq = -1; 151 } 152 return 1; 153 } 154 155 __setup("condev=", condev_setup); 156 157 static void __init set_preferred_console(void) 158 { 159 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 160 add_preferred_console("ttyS", 0, NULL); 161 else if (CONSOLE_IS_3270) 162 add_preferred_console("tty3270", 0, NULL); 163 else if (CONSOLE_IS_VT220) 164 add_preferred_console("ttyS", 1, NULL); 165 else if (CONSOLE_IS_HVC) 166 add_preferred_console("hvc", 0, NULL); 167 } 168 169 static int __init conmode_setup(char *str) 170 { 171 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 172 if (!strcmp(str, "hwc") || !strcmp(str, "sclp")) 173 SET_CONSOLE_SCLP; 174 #endif 175 #if defined(CONFIG_TN3215_CONSOLE) 176 if (!strcmp(str, "3215")) 177 SET_CONSOLE_3215; 178 #endif 179 #if defined(CONFIG_TN3270_CONSOLE) 180 if (!strcmp(str, "3270")) 181 SET_CONSOLE_3270; 182 #endif 183 set_preferred_console(); 184 return 1; 185 } 186 187 __setup("conmode=", conmode_setup); 188 189 static void __init conmode_default(void) 190 { 191 char query_buffer[1024]; 192 char *ptr; 193 194 if (MACHINE_IS_VM) { 195 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 196 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 197 ptr = strstr(query_buffer, "SUBCHANNEL ="); 198 console_irq = simple_strtoul(ptr + 13, NULL, 16); 199 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 200 ptr = strstr(query_buffer, "CONMODE"); 201 /* 202 * Set the conmode to 3215 so that the device recognition 203 * will set the cu_type of the console to 3215. If the 204 * conmode is 3270 and we don't set it back then both 205 * 3215 and the 3270 driver will try to access the console 206 * device (3215 as console and 3270 as normal tty). 207 */ 208 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 209 if (ptr == NULL) { 210 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 211 SET_CONSOLE_SCLP; 212 #endif 213 return; 214 } 215 if (str_has_prefix(ptr + 8, "3270")) { 216 #if defined(CONFIG_TN3270_CONSOLE) 217 SET_CONSOLE_3270; 218 #elif defined(CONFIG_TN3215_CONSOLE) 219 SET_CONSOLE_3215; 220 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 221 SET_CONSOLE_SCLP; 222 #endif 223 } else if (str_has_prefix(ptr + 8, "3215")) { 224 #if defined(CONFIG_TN3215_CONSOLE) 225 SET_CONSOLE_3215; 226 #elif defined(CONFIG_TN3270_CONSOLE) 227 SET_CONSOLE_3270; 228 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 229 SET_CONSOLE_SCLP; 230 #endif 231 } 232 } else if (MACHINE_IS_KVM) { 233 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 234 SET_CONSOLE_VT220; 235 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 236 SET_CONSOLE_SCLP; 237 else 238 SET_CONSOLE_HVC; 239 } else { 240 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 241 SET_CONSOLE_SCLP; 242 #endif 243 } 244 if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE)) 245 conswitchp = &dummy_con; 246 } 247 248 #ifdef CONFIG_CRASH_DUMP 249 static void __init setup_zfcpdump(void) 250 { 251 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 252 return; 253 if (OLDMEM_BASE) 254 return; 255 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 256 console_loglevel = 2; 257 } 258 #else 259 static inline void setup_zfcpdump(void) {} 260 #endif /* CONFIG_CRASH_DUMP */ 261 262 /* 263 * Reboot, halt and power_off stubs. They just call _machine_restart, 264 * _machine_halt or _machine_power_off. 265 */ 266 267 void machine_restart(char *command) 268 { 269 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 270 /* 271 * Only unblank the console if we are called in enabled 272 * context or a bust_spinlocks cleared the way for us. 273 */ 274 console_unblank(); 275 _machine_restart(command); 276 } 277 278 void machine_halt(void) 279 { 280 if (!in_interrupt() || oops_in_progress) 281 /* 282 * Only unblank the console if we are called in enabled 283 * context or a bust_spinlocks cleared the way for us. 284 */ 285 console_unblank(); 286 _machine_halt(); 287 } 288 289 void machine_power_off(void) 290 { 291 if (!in_interrupt() || oops_in_progress) 292 /* 293 * Only unblank the console if we are called in enabled 294 * context or a bust_spinlocks cleared the way for us. 295 */ 296 console_unblank(); 297 _machine_power_off(); 298 } 299 300 /* 301 * Dummy power off function. 302 */ 303 void (*pm_power_off)(void) = machine_power_off; 304 EXPORT_SYMBOL_GPL(pm_power_off); 305 306 void *restart_stack __section(.data); 307 308 unsigned long stack_alloc(void) 309 { 310 #ifdef CONFIG_VMAP_STACK 311 return (unsigned long) 312 __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE, 313 VMALLOC_START, VMALLOC_END, 314 THREADINFO_GFP, 315 PAGE_KERNEL, 0, NUMA_NO_NODE, 316 __builtin_return_address(0)); 317 #else 318 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 319 #endif 320 } 321 322 void stack_free(unsigned long stack) 323 { 324 #ifdef CONFIG_VMAP_STACK 325 vfree((void *) stack); 326 #else 327 free_pages(stack, THREAD_SIZE_ORDER); 328 #endif 329 } 330 331 int __init arch_early_irq_init(void) 332 { 333 unsigned long stack; 334 335 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 336 if (!stack) 337 panic("Couldn't allocate async stack"); 338 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET; 339 return 0; 340 } 341 342 static int __init async_stack_realloc(void) 343 { 344 unsigned long old, new; 345 346 old = S390_lowcore.async_stack - STACK_INIT_OFFSET; 347 new = stack_alloc(); 348 if (!new) 349 panic("Couldn't allocate async stack"); 350 S390_lowcore.async_stack = new + STACK_INIT_OFFSET; 351 free_pages(old, THREAD_SIZE_ORDER); 352 return 0; 353 } 354 early_initcall(async_stack_realloc); 355 356 void __init arch_call_rest_init(void) 357 { 358 unsigned long stack; 359 360 stack = stack_alloc(); 361 if (!stack) 362 panic("Couldn't allocate kernel stack"); 363 current->stack = (void *) stack; 364 #ifdef CONFIG_VMAP_STACK 365 current->stack_vm_area = (void *) stack; 366 #endif 367 set_task_stack_end_magic(current); 368 stack += STACK_INIT_OFFSET; 369 S390_lowcore.kernel_stack = stack; 370 CALL_ON_STACK_NORETURN(rest_init, stack); 371 } 372 373 static void __init setup_lowcore_dat_off(void) 374 { 375 struct lowcore *lc; 376 377 /* 378 * Setup lowcore for boot cpu 379 */ 380 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 381 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 382 if (!lc) 383 panic("%s: Failed to allocate %zu bytes align=%zx\n", 384 __func__, sizeof(*lc), sizeof(*lc)); 385 386 lc->restart_psw.mask = PSW_KERNEL_BITS; 387 lc->restart_psw.addr = (unsigned long) restart_int_handler; 388 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 389 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 390 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 391 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 392 lc->svc_new_psw.addr = (unsigned long) system_call; 393 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 394 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 395 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 396 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 397 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 398 lc->io_new_psw.addr = (unsigned long) io_int_handler; 399 lc->clock_comparator = clock_comparator_max; 400 lc->nodat_stack = ((unsigned long) &init_thread_union) 401 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 402 lc->current_task = (unsigned long)&init_task; 403 lc->lpp = LPP_MAGIC; 404 lc->machine_flags = S390_lowcore.machine_flags; 405 lc->preempt_count = S390_lowcore.preempt_count; 406 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 407 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 408 sizeof(lc->stfle_fac_list)); 409 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list, 410 sizeof(lc->alt_stfle_fac_list)); 411 nmi_alloc_boot_cpu(lc); 412 vdso_alloc_boot_cpu(lc); 413 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 414 lc->async_enter_timer = S390_lowcore.async_enter_timer; 415 lc->exit_timer = S390_lowcore.exit_timer; 416 lc->user_timer = S390_lowcore.user_timer; 417 lc->system_timer = S390_lowcore.system_timer; 418 lc->steal_timer = S390_lowcore.steal_timer; 419 lc->last_update_timer = S390_lowcore.last_update_timer; 420 lc->last_update_clock = S390_lowcore.last_update_clock; 421 422 /* 423 * Allocate the global restart stack which is the same for 424 * all CPUs in cast *one* of them does a PSW restart. 425 */ 426 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE); 427 if (!restart_stack) 428 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 429 __func__, THREAD_SIZE, THREAD_SIZE); 430 restart_stack += STACK_INIT_OFFSET; 431 432 /* 433 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 434 * restart data to the absolute zero lowcore. This is necessary if 435 * PSW restart is done on an offline CPU that has lowcore zero. 436 */ 437 lc->restart_stack = (unsigned long) restart_stack; 438 lc->restart_fn = (unsigned long) do_restart; 439 lc->restart_data = 0; 440 lc->restart_source = -1UL; 441 442 /* Setup absolute zero lowcore */ 443 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 444 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 445 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 446 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 447 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 448 449 lc->spinlock_lockval = arch_spin_lockval(0); 450 lc->spinlock_index = 0; 451 arch_spin_lock_setup(0); 452 lc->br_r1_trampoline = 0x07f1; /* br %r1 */ 453 454 set_prefix((u32)(unsigned long) lc); 455 lowcore_ptr[0] = lc; 456 } 457 458 static void __init setup_lowcore_dat_on(void) 459 { 460 __ctl_clear_bit(0, 28); 461 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; 462 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; 463 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; 464 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; 465 __ctl_set_bit(0, 28); 466 } 467 468 static struct resource code_resource = { 469 .name = "Kernel code", 470 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 471 }; 472 473 static struct resource data_resource = { 474 .name = "Kernel data", 475 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 476 }; 477 478 static struct resource bss_resource = { 479 .name = "Kernel bss", 480 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 481 }; 482 483 static struct resource __initdata *standard_resources[] = { 484 &code_resource, 485 &data_resource, 486 &bss_resource, 487 }; 488 489 static void __init setup_resources(void) 490 { 491 struct resource *res, *std_res, *sub_res; 492 struct memblock_region *reg; 493 int j; 494 495 code_resource.start = (unsigned long) _text; 496 code_resource.end = (unsigned long) _etext - 1; 497 data_resource.start = (unsigned long) _etext; 498 data_resource.end = (unsigned long) _edata - 1; 499 bss_resource.start = (unsigned long) __bss_start; 500 bss_resource.end = (unsigned long) __bss_stop - 1; 501 502 for_each_memblock(memory, reg) { 503 res = memblock_alloc(sizeof(*res), 8); 504 if (!res) 505 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 506 __func__, sizeof(*res), 8); 507 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 508 509 res->name = "System RAM"; 510 res->start = reg->base; 511 res->end = reg->base + reg->size - 1; 512 request_resource(&iomem_resource, res); 513 514 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 515 std_res = standard_resources[j]; 516 if (std_res->start < res->start || 517 std_res->start > res->end) 518 continue; 519 if (std_res->end > res->end) { 520 sub_res = memblock_alloc(sizeof(*sub_res), 8); 521 if (!sub_res) 522 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 523 __func__, sizeof(*sub_res), 8); 524 *sub_res = *std_res; 525 sub_res->end = res->end; 526 std_res->start = res->end + 1; 527 request_resource(res, sub_res); 528 } else { 529 request_resource(res, std_res); 530 } 531 } 532 } 533 #ifdef CONFIG_CRASH_DUMP 534 /* 535 * Re-add removed crash kernel memory as reserved memory. This makes 536 * sure it will be mapped with the identity mapping and struct pages 537 * will be created, so it can be resized later on. 538 * However add it later since the crash kernel resource should not be 539 * part of the System RAM resource. 540 */ 541 if (crashk_res.end) { 542 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); 543 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 544 insert_resource(&iomem_resource, &crashk_res); 545 } 546 #endif 547 } 548 549 static void __init setup_memory_end(void) 550 { 551 unsigned long vmax, tmp; 552 553 /* Choose kernel address space layout: 3 or 4 levels. */ 554 if (IS_ENABLED(CONFIG_KASAN)) { 555 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING) 556 ? _REGION1_SIZE 557 : _REGION2_SIZE; 558 } else { 559 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 560 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 561 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) 562 vmax = _REGION2_SIZE; /* 3-level kernel page table */ 563 else 564 vmax = _REGION1_SIZE; /* 4-level kernel page table */ 565 } 566 567 /* module area is at the end of the kernel address space. */ 568 MODULES_END = vmax; 569 MODULES_VADDR = MODULES_END - MODULES_LEN; 570 VMALLOC_END = MODULES_VADDR; 571 VMALLOC_START = VMALLOC_END - vmalloc_size; 572 573 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 574 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 575 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 576 tmp = SECTION_ALIGN_UP(tmp); 577 tmp = VMALLOC_START - tmp * sizeof(struct page); 578 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 579 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 580 vmemmap = (struct page *) tmp; 581 582 /* Take care that memory_end is set and <= vmemmap */ 583 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap); 584 #ifdef CONFIG_KASAN 585 /* fit in kasan shadow memory region between 1:1 and vmemmap */ 586 memory_end = min(memory_end, KASAN_SHADOW_START); 587 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END); 588 #endif 589 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 590 memblock_remove(memory_end, ULONG_MAX); 591 592 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20); 593 } 594 595 #ifdef CONFIG_CRASH_DUMP 596 597 /* 598 * When kdump is enabled, we have to ensure that no memory from 599 * the area [0 - crashkernel memory size] and 600 * [crashk_res.start - crashk_res.end] is set offline. 601 */ 602 static int kdump_mem_notifier(struct notifier_block *nb, 603 unsigned long action, void *data) 604 { 605 struct memory_notify *arg = data; 606 607 if (action != MEM_GOING_OFFLINE) 608 return NOTIFY_OK; 609 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 610 return NOTIFY_BAD; 611 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 612 return NOTIFY_OK; 613 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 614 return NOTIFY_OK; 615 return NOTIFY_BAD; 616 } 617 618 static struct notifier_block kdump_mem_nb = { 619 .notifier_call = kdump_mem_notifier, 620 }; 621 622 #endif 623 624 /* 625 * Make sure that the area behind memory_end is protected 626 */ 627 static void reserve_memory_end(void) 628 { 629 if (memory_end_set) 630 memblock_reserve(memory_end, ULONG_MAX); 631 } 632 633 /* 634 * Make sure that oldmem, where the dump is stored, is protected 635 */ 636 static void reserve_oldmem(void) 637 { 638 #ifdef CONFIG_CRASH_DUMP 639 if (OLDMEM_BASE) 640 /* Forget all memory above the running kdump system */ 641 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 642 #endif 643 } 644 645 /* 646 * Make sure that oldmem, where the dump is stored, is protected 647 */ 648 static void remove_oldmem(void) 649 { 650 #ifdef CONFIG_CRASH_DUMP 651 if (OLDMEM_BASE) 652 /* Forget all memory above the running kdump system */ 653 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 654 #endif 655 } 656 657 /* 658 * Reserve memory for kdump kernel to be loaded with kexec 659 */ 660 static void __init reserve_crashkernel(void) 661 { 662 #ifdef CONFIG_CRASH_DUMP 663 unsigned long long crash_base, crash_size; 664 phys_addr_t low, high; 665 int rc; 666 667 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 668 &crash_base); 669 670 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 671 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 672 if (rc || crash_size == 0) 673 return; 674 675 if (memblock.memory.regions[0].size < crash_size) { 676 pr_info("crashkernel reservation failed: %s\n", 677 "first memory chunk must be at least crashkernel size"); 678 return; 679 } 680 681 low = crash_base ?: OLDMEM_BASE; 682 high = low + crash_size; 683 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 684 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 685 crash_base = low; 686 } else { 687 /* Find suitable area in free memory */ 688 low = max_t(unsigned long, crash_size, sclp.hsa_size); 689 high = crash_base ? crash_base + crash_size : ULONG_MAX; 690 691 if (crash_base && crash_base < low) { 692 pr_info("crashkernel reservation failed: %s\n", 693 "crash_base too low"); 694 return; 695 } 696 low = crash_base ?: low; 697 crash_base = memblock_find_in_range(low, high, crash_size, 698 KEXEC_CRASH_MEM_ALIGN); 699 } 700 701 if (!crash_base) { 702 pr_info("crashkernel reservation failed: %s\n", 703 "no suitable area found"); 704 return; 705 } 706 707 if (register_memory_notifier(&kdump_mem_nb)) 708 return; 709 710 if (!OLDMEM_BASE && MACHINE_IS_VM) 711 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 712 crashk_res.start = crash_base; 713 crashk_res.end = crash_base + crash_size - 1; 714 memblock_remove(crash_base, crash_size); 715 pr_info("Reserving %lluMB of memory at %lluMB " 716 "for crashkernel (System RAM: %luMB)\n", 717 crash_size >> 20, crash_base >> 20, 718 (unsigned long)memblock.memory.total_size >> 20); 719 os_info_crashkernel_add(crash_base, crash_size); 720 #endif 721 } 722 723 /* 724 * Reserve the initrd from being used by memblock 725 */ 726 static void __init reserve_initrd(void) 727 { 728 #ifdef CONFIG_BLK_DEV_INITRD 729 if (!INITRD_START || !INITRD_SIZE) 730 return; 731 initrd_start = INITRD_START; 732 initrd_end = initrd_start + INITRD_SIZE; 733 memblock_reserve(INITRD_START, INITRD_SIZE); 734 #endif 735 } 736 737 /* 738 * Reserve the memory area used to pass the certificate lists 739 */ 740 static void __init reserve_certificate_list(void) 741 { 742 if (ipl_cert_list_addr) 743 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 744 } 745 746 static void __init reserve_mem_detect_info(void) 747 { 748 unsigned long start, size; 749 750 get_mem_detect_reserved(&start, &size); 751 if (size) 752 memblock_reserve(start, size); 753 } 754 755 static void __init free_mem_detect_info(void) 756 { 757 unsigned long start, size; 758 759 get_mem_detect_reserved(&start, &size); 760 if (size) 761 memblock_free(start, size); 762 } 763 764 static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size) 765 { 766 memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n", 767 start, start + size - 1); 768 memblock_add_range(&memblock.memory, start, size, 0, 0); 769 memblock_add_range(&memblock.physmem, start, size, 0, 0); 770 } 771 772 static const char * __init get_mem_info_source(void) 773 { 774 switch (mem_detect.info_source) { 775 case MEM_DETECT_SCLP_STOR_INFO: 776 return "sclp storage info"; 777 case MEM_DETECT_DIAG260: 778 return "diag260"; 779 case MEM_DETECT_SCLP_READ_INFO: 780 return "sclp read info"; 781 case MEM_DETECT_BIN_SEARCH: 782 return "binary search"; 783 } 784 return "none"; 785 } 786 787 static void __init memblock_add_mem_detect_info(void) 788 { 789 unsigned long start, end; 790 int i; 791 792 memblock_dbg("physmem info source: %s (%hhd)\n", 793 get_mem_info_source(), mem_detect.info_source); 794 /* keep memblock lists close to the kernel */ 795 memblock_set_bottom_up(true); 796 for_each_mem_detect_block(i, &start, &end) 797 memblock_physmem_add(start, end - start); 798 memblock_set_bottom_up(false); 799 memblock_dump_all(); 800 } 801 802 /* 803 * Check for initrd being in usable memory 804 */ 805 static void __init check_initrd(void) 806 { 807 #ifdef CONFIG_BLK_DEV_INITRD 808 if (INITRD_START && INITRD_SIZE && 809 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 810 pr_err("The initial RAM disk does not fit into the memory\n"); 811 memblock_free(INITRD_START, INITRD_SIZE); 812 initrd_start = initrd_end = 0; 813 } 814 #endif 815 } 816 817 /* 818 * Reserve memory used for lowcore/command line/kernel image. 819 */ 820 static void __init reserve_kernel(void) 821 { 822 unsigned long start_pfn = PFN_UP(__pa(_end)); 823 824 memblock_reserve(0, HEAD_END); 825 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 826 - (unsigned long)_stext); 827 memblock_reserve(__sdma, __edma - __sdma); 828 } 829 830 static void __init setup_memory(void) 831 { 832 struct memblock_region *reg; 833 834 /* 835 * Init storage key for present memory 836 */ 837 for_each_memblock(memory, reg) { 838 storage_key_init_range(reg->base, reg->base + reg->size); 839 } 840 psw_set_key(PAGE_DEFAULT_KEY); 841 842 /* Only cosmetics */ 843 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 844 } 845 846 /* 847 * Setup hardware capabilities. 848 */ 849 static int __init setup_hwcaps(void) 850 { 851 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 852 struct cpuid cpu_id; 853 int i; 854 855 /* 856 * The store facility list bits numbers as found in the principles 857 * of operation are numbered with bit 1UL<<31 as number 0 to 858 * bit 1UL<<0 as number 31. 859 * Bit 0: instructions named N3, "backported" to esa-mode 860 * Bit 2: z/Architecture mode is active 861 * Bit 7: the store-facility-list-extended facility is installed 862 * Bit 17: the message-security assist is installed 863 * Bit 19: the long-displacement facility is installed 864 * Bit 21: the extended-immediate facility is installed 865 * Bit 22: extended-translation facility 3 is installed 866 * Bit 30: extended-translation facility 3 enhancement facility 867 * These get translated to: 868 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 869 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 870 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 871 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 872 */ 873 for (i = 0; i < 6; i++) 874 if (test_facility(stfl_bits[i])) 875 elf_hwcap |= 1UL << i; 876 877 if (test_facility(22) && test_facility(30)) 878 elf_hwcap |= HWCAP_S390_ETF3EH; 879 880 /* 881 * Check for additional facilities with store-facility-list-extended. 882 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 883 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 884 * as stored by stfl, bits 32-xxx contain additional facilities. 885 * How many facility words are stored depends on the number of 886 * doublewords passed to the instruction. The additional facilities 887 * are: 888 * Bit 42: decimal floating point facility is installed 889 * Bit 44: perform floating point operation facility is installed 890 * translated to: 891 * HWCAP_S390_DFP bit 6 (42 && 44). 892 */ 893 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 894 elf_hwcap |= HWCAP_S390_DFP; 895 896 /* 897 * Huge page support HWCAP_S390_HPAGE is bit 7. 898 */ 899 if (MACHINE_HAS_EDAT1) 900 elf_hwcap |= HWCAP_S390_HPAGE; 901 902 /* 903 * 64-bit register support for 31-bit processes 904 * HWCAP_S390_HIGH_GPRS is bit 9. 905 */ 906 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 907 908 /* 909 * Transactional execution support HWCAP_S390_TE is bit 10. 910 */ 911 if (MACHINE_HAS_TE) 912 elf_hwcap |= HWCAP_S390_TE; 913 914 /* 915 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 916 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 917 * instead of facility bit 129. 918 */ 919 if (MACHINE_HAS_VX) { 920 elf_hwcap |= HWCAP_S390_VXRS; 921 if (test_facility(134)) 922 elf_hwcap |= HWCAP_S390_VXRS_EXT; 923 if (test_facility(135)) 924 elf_hwcap |= HWCAP_S390_VXRS_BCD; 925 if (test_facility(148)) 926 elf_hwcap |= HWCAP_S390_VXRS_EXT2; 927 if (test_facility(152)) 928 elf_hwcap |= HWCAP_S390_VXRS_PDE; 929 } 930 if (test_facility(150)) 931 elf_hwcap |= HWCAP_S390_SORT; 932 if (test_facility(151)) 933 elf_hwcap |= HWCAP_S390_DFLT; 934 935 /* 936 * Guarded storage support HWCAP_S390_GS is bit 12. 937 */ 938 if (MACHINE_HAS_GS) 939 elf_hwcap |= HWCAP_S390_GS; 940 941 get_cpu_id(&cpu_id); 942 add_device_randomness(&cpu_id, sizeof(cpu_id)); 943 switch (cpu_id.machine) { 944 case 0x2064: 945 case 0x2066: 946 default: /* Use "z900" as default for 64 bit kernels. */ 947 strcpy(elf_platform, "z900"); 948 break; 949 case 0x2084: 950 case 0x2086: 951 strcpy(elf_platform, "z990"); 952 break; 953 case 0x2094: 954 case 0x2096: 955 strcpy(elf_platform, "z9-109"); 956 break; 957 case 0x2097: 958 case 0x2098: 959 strcpy(elf_platform, "z10"); 960 break; 961 case 0x2817: 962 case 0x2818: 963 strcpy(elf_platform, "z196"); 964 break; 965 case 0x2827: 966 case 0x2828: 967 strcpy(elf_platform, "zEC12"); 968 break; 969 case 0x2964: 970 case 0x2965: 971 strcpy(elf_platform, "z13"); 972 break; 973 case 0x3906: 974 case 0x3907: 975 strcpy(elf_platform, "z14"); 976 break; 977 case 0x8561: 978 case 0x8562: 979 strcpy(elf_platform, "z15"); 980 break; 981 } 982 983 /* 984 * Virtualization support HWCAP_INT_SIE is bit 0. 985 */ 986 if (sclp.has_sief2) 987 int_hwcap |= HWCAP_INT_SIE; 988 989 return 0; 990 } 991 arch_initcall(setup_hwcaps); 992 993 /* 994 * Add system information as device randomness 995 */ 996 static void __init setup_randomness(void) 997 { 998 struct sysinfo_3_2_2 *vmms; 999 1000 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE, 1001 PAGE_SIZE); 1002 if (!vmms) 1003 panic("Failed to allocate memory for sysinfo structure\n"); 1004 1005 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 1006 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 1007 memblock_free((unsigned long) vmms, PAGE_SIZE); 1008 } 1009 1010 /* 1011 * Find the correct size for the task_struct. This depends on 1012 * the size of the struct fpu at the end of the thread_struct 1013 * which is embedded in the task_struct. 1014 */ 1015 static void __init setup_task_size(void) 1016 { 1017 int task_size = sizeof(struct task_struct); 1018 1019 if (!MACHINE_HAS_VX) { 1020 task_size -= sizeof(__vector128) * __NUM_VXRS; 1021 task_size += sizeof(freg_t) * __NUM_FPRS; 1022 } 1023 arch_task_struct_size = task_size; 1024 } 1025 1026 /* 1027 * Issue diagnose 318 to set the control program name and 1028 * version codes. 1029 */ 1030 static void __init setup_control_program_code(void) 1031 { 1032 union diag318_info diag318_info = { 1033 .cpnc = CPNC_LINUX, 1034 .cpvc_linux = 0, 1035 .cpvc_distro = {0}, 1036 }; 1037 1038 if (!sclp.has_diag318) 1039 return; 1040 1041 diag_stat_inc(DIAG_STAT_X318); 1042 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 1043 } 1044 1045 /* 1046 * Print the component list from the IPL report 1047 */ 1048 static void __init log_component_list(void) 1049 { 1050 struct ipl_rb_component_entry *ptr, *end; 1051 char *str; 1052 1053 if (!early_ipl_comp_list_addr) 1054 return; 1055 if (ipl_block.hdr.flags & IPL_PL_FLAG_IPLSR) 1056 pr_info("Linux is running with Secure-IPL enabled\n"); 1057 else 1058 pr_info("Linux is running with Secure-IPL disabled\n"); 1059 ptr = (void *) early_ipl_comp_list_addr; 1060 end = (void *) ptr + early_ipl_comp_list_size; 1061 pr_info("The IPL report contains the following components:\n"); 1062 while (ptr < end) { 1063 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 1064 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 1065 str = "signed, verified"; 1066 else 1067 str = "signed, verification failed"; 1068 } else { 1069 str = "not signed"; 1070 } 1071 pr_info("%016llx - %016llx (%s)\n", 1072 ptr->addr, ptr->addr + ptr->len, str); 1073 ptr++; 1074 } 1075 } 1076 1077 /* 1078 * Setup function called from init/main.c just after the banner 1079 * was printed. 1080 */ 1081 1082 void __init setup_arch(char **cmdline_p) 1083 { 1084 /* 1085 * print what head.S has found out about the machine 1086 */ 1087 if (MACHINE_IS_VM) 1088 pr_info("Linux is running as a z/VM " 1089 "guest operating system in 64-bit mode\n"); 1090 else if (MACHINE_IS_KVM) 1091 pr_info("Linux is running under KVM in 64-bit mode\n"); 1092 else if (MACHINE_IS_LPAR) 1093 pr_info("Linux is running natively in 64-bit mode\n"); 1094 else 1095 pr_info("Linux is running as a guest in 64-bit mode\n"); 1096 1097 log_component_list(); 1098 1099 /* Have one command line that is parsed and saved in /proc/cmdline */ 1100 /* boot_command_line has been already set up in early.c */ 1101 *cmdline_p = boot_command_line; 1102 1103 ROOT_DEV = Root_RAM0; 1104 1105 init_mm.start_code = (unsigned long) _text; 1106 init_mm.end_code = (unsigned long) _etext; 1107 init_mm.end_data = (unsigned long) _edata; 1108 init_mm.brk = (unsigned long) _end; 1109 1110 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 1111 nospec_auto_detect(); 1112 1113 parse_early_param(); 1114 #ifdef CONFIG_CRASH_DUMP 1115 /* Deactivate elfcorehdr= kernel parameter */ 1116 elfcorehdr_addr = ELFCORE_ADDR_MAX; 1117 #endif 1118 1119 os_info_init(); 1120 setup_ipl(); 1121 setup_task_size(); 1122 setup_control_program_code(); 1123 1124 /* Do some memory reservations *before* memory is added to memblock */ 1125 reserve_memory_end(); 1126 reserve_oldmem(); 1127 reserve_kernel(); 1128 reserve_initrd(); 1129 reserve_certificate_list(); 1130 reserve_mem_detect_info(); 1131 memblock_allow_resize(); 1132 1133 /* Get information about *all* installed memory */ 1134 memblock_add_mem_detect_info(); 1135 1136 free_mem_detect_info(); 1137 remove_oldmem(); 1138 1139 /* 1140 * Make sure all chunks are MAX_ORDER aligned so we don't need the 1141 * extra checks that HOLES_IN_ZONE would require. 1142 * 1143 * Is this still required? 1144 */ 1145 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 1146 1147 setup_memory_end(); 1148 setup_memory(); 1149 dma_contiguous_reserve(memory_end); 1150 vmcp_cma_reserve(); 1151 1152 check_initrd(); 1153 reserve_crashkernel(); 1154 #ifdef CONFIG_CRASH_DUMP 1155 /* 1156 * Be aware that smp_save_dump_cpus() triggers a system reset. 1157 * Therefore CPU and device initialization should be done afterwards. 1158 */ 1159 smp_save_dump_cpus(); 1160 #endif 1161 1162 setup_resources(); 1163 setup_lowcore_dat_off(); 1164 smp_fill_possible_mask(); 1165 cpu_detect_mhz_feature(); 1166 cpu_init(); 1167 numa_setup(); 1168 smp_detect_cpus(); 1169 topology_init_early(); 1170 1171 /* 1172 * Create kernel page tables and switch to virtual addressing. 1173 */ 1174 paging_init(); 1175 1176 /* 1177 * After paging_init created the kernel page table, the new PSWs 1178 * in lowcore can now run with DAT enabled. 1179 */ 1180 setup_lowcore_dat_on(); 1181 1182 /* Setup default console */ 1183 conmode_default(); 1184 set_preferred_console(); 1185 1186 apply_alternative_instructions(); 1187 if (IS_ENABLED(CONFIG_EXPOLINE)) 1188 nospec_init_branches(); 1189 1190 /* Setup zfcpdump support */ 1191 setup_zfcpdump(); 1192 1193 /* Add system specific data to the random pool */ 1194 setup_randomness(); 1195 } 1196