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 unsigned int __bootdata_preserved(zlib_dfltcc_support); 115 EXPORT_SYMBOL(zlib_dfltcc_support); 116 117 unsigned long VMALLOC_START; 118 EXPORT_SYMBOL(VMALLOC_START); 119 120 unsigned long VMALLOC_END; 121 EXPORT_SYMBOL(VMALLOC_END); 122 123 struct page *vmemmap; 124 EXPORT_SYMBOL(vmemmap); 125 126 unsigned long MODULES_VADDR; 127 unsigned long MODULES_END; 128 129 /* An array with a pointer to the lowcore of every CPU. */ 130 struct lowcore *lowcore_ptr[NR_CPUS]; 131 EXPORT_SYMBOL(lowcore_ptr); 132 133 /* 134 * This is set up by the setup-routine at boot-time 135 * for S390 need to find out, what we have to setup 136 * using address 0x10400 ... 137 */ 138 139 #include <asm/setup.h> 140 141 /* 142 * condev= and conmode= setup parameter. 143 */ 144 145 static int __init condev_setup(char *str) 146 { 147 int vdev; 148 149 vdev = simple_strtoul(str, &str, 0); 150 if (vdev >= 0 && vdev < 65536) { 151 console_devno = vdev; 152 console_irq = -1; 153 } 154 return 1; 155 } 156 157 __setup("condev=", condev_setup); 158 159 static void __init set_preferred_console(void) 160 { 161 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 162 add_preferred_console("ttyS", 0, NULL); 163 else if (CONSOLE_IS_3270) 164 add_preferred_console("tty3270", 0, NULL); 165 else if (CONSOLE_IS_VT220) 166 add_preferred_console("ttyS", 1, NULL); 167 else if (CONSOLE_IS_HVC) 168 add_preferred_console("hvc", 0, NULL); 169 } 170 171 static int __init conmode_setup(char *str) 172 { 173 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 174 if (!strcmp(str, "hwc") || !strcmp(str, "sclp")) 175 SET_CONSOLE_SCLP; 176 #endif 177 #if defined(CONFIG_TN3215_CONSOLE) 178 if (!strcmp(str, "3215")) 179 SET_CONSOLE_3215; 180 #endif 181 #if defined(CONFIG_TN3270_CONSOLE) 182 if (!strcmp(str, "3270")) 183 SET_CONSOLE_3270; 184 #endif 185 set_preferred_console(); 186 return 1; 187 } 188 189 __setup("conmode=", conmode_setup); 190 191 static void __init conmode_default(void) 192 { 193 char query_buffer[1024]; 194 char *ptr; 195 196 if (MACHINE_IS_VM) { 197 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 198 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 199 ptr = strstr(query_buffer, "SUBCHANNEL ="); 200 console_irq = simple_strtoul(ptr + 13, NULL, 16); 201 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 202 ptr = strstr(query_buffer, "CONMODE"); 203 /* 204 * Set the conmode to 3215 so that the device recognition 205 * will set the cu_type of the console to 3215. If the 206 * conmode is 3270 and we don't set it back then both 207 * 3215 and the 3270 driver will try to access the console 208 * device (3215 as console and 3270 as normal tty). 209 */ 210 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 211 if (ptr == NULL) { 212 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 213 SET_CONSOLE_SCLP; 214 #endif 215 return; 216 } 217 if (str_has_prefix(ptr + 8, "3270")) { 218 #if defined(CONFIG_TN3270_CONSOLE) 219 SET_CONSOLE_3270; 220 #elif defined(CONFIG_TN3215_CONSOLE) 221 SET_CONSOLE_3215; 222 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 223 SET_CONSOLE_SCLP; 224 #endif 225 } else if (str_has_prefix(ptr + 8, "3215")) { 226 #if defined(CONFIG_TN3215_CONSOLE) 227 SET_CONSOLE_3215; 228 #elif defined(CONFIG_TN3270_CONSOLE) 229 SET_CONSOLE_3270; 230 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 231 SET_CONSOLE_SCLP; 232 #endif 233 } 234 } else if (MACHINE_IS_KVM) { 235 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 236 SET_CONSOLE_VT220; 237 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 238 SET_CONSOLE_SCLP; 239 else 240 SET_CONSOLE_HVC; 241 } else { 242 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 243 SET_CONSOLE_SCLP; 244 #endif 245 } 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 const char * __init get_mem_info_source(void) 765 { 766 switch (mem_detect.info_source) { 767 case MEM_DETECT_SCLP_STOR_INFO: 768 return "sclp storage info"; 769 case MEM_DETECT_DIAG260: 770 return "diag260"; 771 case MEM_DETECT_SCLP_READ_INFO: 772 return "sclp read info"; 773 case MEM_DETECT_BIN_SEARCH: 774 return "binary search"; 775 } 776 return "none"; 777 } 778 779 static void __init memblock_add_mem_detect_info(void) 780 { 781 unsigned long start, end; 782 int i; 783 784 memblock_dbg("physmem info source: %s (%hhd)\n", 785 get_mem_info_source(), mem_detect.info_source); 786 /* keep memblock lists close to the kernel */ 787 memblock_set_bottom_up(true); 788 for_each_mem_detect_block(i, &start, &end) { 789 memblock_add(start, end - start); 790 memblock_physmem_add(start, end - start); 791 } 792 memblock_set_bottom_up(false); 793 memblock_dump_all(); 794 } 795 796 /* 797 * Check for initrd being in usable memory 798 */ 799 static void __init check_initrd(void) 800 { 801 #ifdef CONFIG_BLK_DEV_INITRD 802 if (INITRD_START && INITRD_SIZE && 803 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 804 pr_err("The initial RAM disk does not fit into the memory\n"); 805 memblock_free(INITRD_START, INITRD_SIZE); 806 initrd_start = initrd_end = 0; 807 } 808 #endif 809 } 810 811 /* 812 * Reserve memory used for lowcore/command line/kernel image. 813 */ 814 static void __init reserve_kernel(void) 815 { 816 unsigned long start_pfn = PFN_UP(__pa(_end)); 817 818 memblock_reserve(0, HEAD_END); 819 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 820 - (unsigned long)_stext); 821 memblock_reserve(__sdma, __edma - __sdma); 822 } 823 824 static void __init setup_memory(void) 825 { 826 struct memblock_region *reg; 827 828 /* 829 * Init storage key for present memory 830 */ 831 for_each_memblock(memory, reg) { 832 storage_key_init_range(reg->base, reg->base + reg->size); 833 } 834 psw_set_key(PAGE_DEFAULT_KEY); 835 836 /* Only cosmetics */ 837 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 838 } 839 840 /* 841 * Setup hardware capabilities. 842 */ 843 static int __init setup_hwcaps(void) 844 { 845 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 846 struct cpuid cpu_id; 847 int i; 848 849 /* 850 * The store facility list bits numbers as found in the principles 851 * of operation are numbered with bit 1UL<<31 as number 0 to 852 * bit 1UL<<0 as number 31. 853 * Bit 0: instructions named N3, "backported" to esa-mode 854 * Bit 2: z/Architecture mode is active 855 * Bit 7: the store-facility-list-extended facility is installed 856 * Bit 17: the message-security assist is installed 857 * Bit 19: the long-displacement facility is installed 858 * Bit 21: the extended-immediate facility is installed 859 * Bit 22: extended-translation facility 3 is installed 860 * Bit 30: extended-translation facility 3 enhancement facility 861 * These get translated to: 862 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 863 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 864 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 865 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 866 */ 867 for (i = 0; i < 6; i++) 868 if (test_facility(stfl_bits[i])) 869 elf_hwcap |= 1UL << i; 870 871 if (test_facility(22) && test_facility(30)) 872 elf_hwcap |= HWCAP_S390_ETF3EH; 873 874 /* 875 * Check for additional facilities with store-facility-list-extended. 876 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 877 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 878 * as stored by stfl, bits 32-xxx contain additional facilities. 879 * How many facility words are stored depends on the number of 880 * doublewords passed to the instruction. The additional facilities 881 * are: 882 * Bit 42: decimal floating point facility is installed 883 * Bit 44: perform floating point operation facility is installed 884 * translated to: 885 * HWCAP_S390_DFP bit 6 (42 && 44). 886 */ 887 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 888 elf_hwcap |= HWCAP_S390_DFP; 889 890 /* 891 * Huge page support HWCAP_S390_HPAGE is bit 7. 892 */ 893 if (MACHINE_HAS_EDAT1) 894 elf_hwcap |= HWCAP_S390_HPAGE; 895 896 /* 897 * 64-bit register support for 31-bit processes 898 * HWCAP_S390_HIGH_GPRS is bit 9. 899 */ 900 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 901 902 /* 903 * Transactional execution support HWCAP_S390_TE is bit 10. 904 */ 905 if (MACHINE_HAS_TE) 906 elf_hwcap |= HWCAP_S390_TE; 907 908 /* 909 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 910 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 911 * instead of facility bit 129. 912 */ 913 if (MACHINE_HAS_VX) { 914 elf_hwcap |= HWCAP_S390_VXRS; 915 if (test_facility(134)) 916 elf_hwcap |= HWCAP_S390_VXRS_EXT; 917 if (test_facility(135)) 918 elf_hwcap |= HWCAP_S390_VXRS_BCD; 919 if (test_facility(148)) 920 elf_hwcap |= HWCAP_S390_VXRS_EXT2; 921 if (test_facility(152)) 922 elf_hwcap |= HWCAP_S390_VXRS_PDE; 923 } 924 if (test_facility(150)) 925 elf_hwcap |= HWCAP_S390_SORT; 926 if (test_facility(151)) 927 elf_hwcap |= HWCAP_S390_DFLT; 928 929 /* 930 * Guarded storage support HWCAP_S390_GS is bit 12. 931 */ 932 if (MACHINE_HAS_GS) 933 elf_hwcap |= HWCAP_S390_GS; 934 935 get_cpu_id(&cpu_id); 936 add_device_randomness(&cpu_id, sizeof(cpu_id)); 937 switch (cpu_id.machine) { 938 case 0x2064: 939 case 0x2066: 940 default: /* Use "z900" as default for 64 bit kernels. */ 941 strcpy(elf_platform, "z900"); 942 break; 943 case 0x2084: 944 case 0x2086: 945 strcpy(elf_platform, "z990"); 946 break; 947 case 0x2094: 948 case 0x2096: 949 strcpy(elf_platform, "z9-109"); 950 break; 951 case 0x2097: 952 case 0x2098: 953 strcpy(elf_platform, "z10"); 954 break; 955 case 0x2817: 956 case 0x2818: 957 strcpy(elf_platform, "z196"); 958 break; 959 case 0x2827: 960 case 0x2828: 961 strcpy(elf_platform, "zEC12"); 962 break; 963 case 0x2964: 964 case 0x2965: 965 strcpy(elf_platform, "z13"); 966 break; 967 case 0x3906: 968 case 0x3907: 969 strcpy(elf_platform, "z14"); 970 break; 971 case 0x8561: 972 case 0x8562: 973 strcpy(elf_platform, "z15"); 974 break; 975 } 976 977 /* 978 * Virtualization support HWCAP_INT_SIE is bit 0. 979 */ 980 if (sclp.has_sief2) 981 int_hwcap |= HWCAP_INT_SIE; 982 983 return 0; 984 } 985 arch_initcall(setup_hwcaps); 986 987 /* 988 * Add system information as device randomness 989 */ 990 static void __init setup_randomness(void) 991 { 992 struct sysinfo_3_2_2 *vmms; 993 994 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE, 995 PAGE_SIZE); 996 if (!vmms) 997 panic("Failed to allocate memory for sysinfo structure\n"); 998 999 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 1000 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 1001 memblock_free((unsigned long) vmms, PAGE_SIZE); 1002 } 1003 1004 /* 1005 * Find the correct size for the task_struct. This depends on 1006 * the size of the struct fpu at the end of the thread_struct 1007 * which is embedded in the task_struct. 1008 */ 1009 static void __init setup_task_size(void) 1010 { 1011 int task_size = sizeof(struct task_struct); 1012 1013 if (!MACHINE_HAS_VX) { 1014 task_size -= sizeof(__vector128) * __NUM_VXRS; 1015 task_size += sizeof(freg_t) * __NUM_FPRS; 1016 } 1017 arch_task_struct_size = task_size; 1018 } 1019 1020 /* 1021 * Issue diagnose 318 to set the control program name and 1022 * version codes. 1023 */ 1024 static void __init setup_control_program_code(void) 1025 { 1026 union diag318_info diag318_info = { 1027 .cpnc = CPNC_LINUX, 1028 .cpvc_linux = 0, 1029 .cpvc_distro = {0}, 1030 }; 1031 1032 if (!sclp.has_diag318) 1033 return; 1034 1035 diag_stat_inc(DIAG_STAT_X318); 1036 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 1037 } 1038 1039 /* 1040 * Print the component list from the IPL report 1041 */ 1042 static void __init log_component_list(void) 1043 { 1044 struct ipl_rb_component_entry *ptr, *end; 1045 char *str; 1046 1047 if (!early_ipl_comp_list_addr) 1048 return; 1049 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) 1050 pr_info("Linux is running with Secure-IPL enabled\n"); 1051 else 1052 pr_info("Linux is running with Secure-IPL disabled\n"); 1053 ptr = (void *) early_ipl_comp_list_addr; 1054 end = (void *) ptr + early_ipl_comp_list_size; 1055 pr_info("The IPL report contains the following components:\n"); 1056 while (ptr < end) { 1057 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 1058 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 1059 str = "signed, verified"; 1060 else 1061 str = "signed, verification failed"; 1062 } else { 1063 str = "not signed"; 1064 } 1065 pr_info("%016llx - %016llx (%s)\n", 1066 ptr->addr, ptr->addr + ptr->len, str); 1067 ptr++; 1068 } 1069 } 1070 1071 /* 1072 * Setup function called from init/main.c just after the banner 1073 * was printed. 1074 */ 1075 1076 void __init setup_arch(char **cmdline_p) 1077 { 1078 /* 1079 * print what head.S has found out about the machine 1080 */ 1081 if (MACHINE_IS_VM) 1082 pr_info("Linux is running as a z/VM " 1083 "guest operating system in 64-bit mode\n"); 1084 else if (MACHINE_IS_KVM) 1085 pr_info("Linux is running under KVM in 64-bit mode\n"); 1086 else if (MACHINE_IS_LPAR) 1087 pr_info("Linux is running natively in 64-bit mode\n"); 1088 else 1089 pr_info("Linux is running as a guest in 64-bit mode\n"); 1090 1091 log_component_list(); 1092 1093 /* Have one command line that is parsed and saved in /proc/cmdline */ 1094 /* boot_command_line has been already set up in early.c */ 1095 *cmdline_p = boot_command_line; 1096 1097 ROOT_DEV = Root_RAM0; 1098 1099 init_mm.start_code = (unsigned long) _text; 1100 init_mm.end_code = (unsigned long) _etext; 1101 init_mm.end_data = (unsigned long) _edata; 1102 init_mm.brk = (unsigned long) _end; 1103 1104 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 1105 nospec_auto_detect(); 1106 1107 parse_early_param(); 1108 #ifdef CONFIG_CRASH_DUMP 1109 /* Deactivate elfcorehdr= kernel parameter */ 1110 elfcorehdr_addr = ELFCORE_ADDR_MAX; 1111 #endif 1112 1113 os_info_init(); 1114 setup_ipl(); 1115 setup_task_size(); 1116 setup_control_program_code(); 1117 1118 /* Do some memory reservations *before* memory is added to memblock */ 1119 reserve_memory_end(); 1120 reserve_oldmem(); 1121 reserve_kernel(); 1122 reserve_initrd(); 1123 reserve_certificate_list(); 1124 reserve_mem_detect_info(); 1125 memblock_allow_resize(); 1126 1127 /* Get information about *all* installed memory */ 1128 memblock_add_mem_detect_info(); 1129 1130 free_mem_detect_info(); 1131 remove_oldmem(); 1132 1133 /* 1134 * Make sure all chunks are MAX_ORDER aligned so we don't need the 1135 * extra checks that HOLES_IN_ZONE would require. 1136 * 1137 * Is this still required? 1138 */ 1139 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 1140 1141 setup_memory_end(); 1142 setup_memory(); 1143 dma_contiguous_reserve(memory_end); 1144 vmcp_cma_reserve(); 1145 1146 check_initrd(); 1147 reserve_crashkernel(); 1148 #ifdef CONFIG_CRASH_DUMP 1149 /* 1150 * Be aware that smp_save_dump_cpus() triggers a system reset. 1151 * Therefore CPU and device initialization should be done afterwards. 1152 */ 1153 smp_save_dump_cpus(); 1154 #endif 1155 1156 setup_resources(); 1157 setup_lowcore_dat_off(); 1158 smp_fill_possible_mask(); 1159 cpu_detect_mhz_feature(); 1160 cpu_init(); 1161 numa_setup(); 1162 smp_detect_cpus(); 1163 topology_init_early(); 1164 1165 /* 1166 * Create kernel page tables and switch to virtual addressing. 1167 */ 1168 paging_init(); 1169 1170 /* 1171 * After paging_init created the kernel page table, the new PSWs 1172 * in lowcore can now run with DAT enabled. 1173 */ 1174 setup_lowcore_dat_on(); 1175 1176 /* Setup default console */ 1177 conmode_default(); 1178 set_preferred_console(); 1179 1180 apply_alternative_instructions(); 1181 if (IS_ENABLED(CONFIG_EXPOLINE)) 1182 nospec_init_branches(); 1183 1184 /* Setup zfcpdump support */ 1185 setup_zfcpdump(); 1186 1187 /* Add system specific data to the random pool */ 1188 setup_randomness(); 1189 } 1190