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 struct stack_frame *frame; 359 unsigned long stack; 360 361 stack = stack_alloc(); 362 if (!stack) 363 panic("Couldn't allocate kernel stack"); 364 current->stack = (void *) stack; 365 #ifdef CONFIG_VMAP_STACK 366 current->stack_vm_area = (void *) stack; 367 #endif 368 set_task_stack_end_magic(current); 369 stack += STACK_INIT_OFFSET; 370 S390_lowcore.kernel_stack = stack; 371 frame = (struct stack_frame *) stack; 372 memset(frame, 0, sizeof(*frame)); 373 /* Branch to rest_init on the new stack, never returns */ 374 asm volatile( 375 " la 15,0(%[_frame])\n" 376 " jg rest_init\n" 377 : : [_frame] "a" (frame)); 378 } 379 380 static void __init setup_lowcore_dat_off(void) 381 { 382 struct lowcore *lc; 383 384 /* 385 * Setup lowcore for boot cpu 386 */ 387 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 388 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 389 if (!lc) 390 panic("%s: Failed to allocate %zu bytes align=%zx\n", 391 __func__, sizeof(*lc), sizeof(*lc)); 392 393 lc->restart_psw.mask = PSW_KERNEL_BITS; 394 lc->restart_psw.addr = (unsigned long) restart_int_handler; 395 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 396 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 397 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 398 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 399 lc->svc_new_psw.addr = (unsigned long) system_call; 400 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 401 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 402 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 403 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 404 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 405 lc->io_new_psw.addr = (unsigned long) io_int_handler; 406 lc->clock_comparator = clock_comparator_max; 407 lc->nodat_stack = ((unsigned long) &init_thread_union) 408 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 409 lc->current_task = (unsigned long)&init_task; 410 lc->lpp = LPP_MAGIC; 411 lc->machine_flags = S390_lowcore.machine_flags; 412 lc->preempt_count = S390_lowcore.preempt_count; 413 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 414 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 415 sizeof(lc->stfle_fac_list)); 416 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list, 417 sizeof(lc->alt_stfle_fac_list)); 418 nmi_alloc_boot_cpu(lc); 419 vdso_alloc_boot_cpu(lc); 420 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 421 lc->async_enter_timer = S390_lowcore.async_enter_timer; 422 lc->exit_timer = S390_lowcore.exit_timer; 423 lc->user_timer = S390_lowcore.user_timer; 424 lc->system_timer = S390_lowcore.system_timer; 425 lc->steal_timer = S390_lowcore.steal_timer; 426 lc->last_update_timer = S390_lowcore.last_update_timer; 427 lc->last_update_clock = S390_lowcore.last_update_clock; 428 429 /* 430 * Allocate the global restart stack which is the same for 431 * all CPUs in cast *one* of them does a PSW restart. 432 */ 433 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE); 434 if (!restart_stack) 435 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 436 __func__, THREAD_SIZE, THREAD_SIZE); 437 restart_stack += STACK_INIT_OFFSET; 438 439 /* 440 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 441 * restart data to the absolute zero lowcore. This is necessary if 442 * PSW restart is done on an offline CPU that has lowcore zero. 443 */ 444 lc->restart_stack = (unsigned long) restart_stack; 445 lc->restart_fn = (unsigned long) do_restart; 446 lc->restart_data = 0; 447 lc->restart_source = -1UL; 448 449 /* Setup absolute zero lowcore */ 450 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 451 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 452 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 453 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 454 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 455 456 lc->spinlock_lockval = arch_spin_lockval(0); 457 lc->spinlock_index = 0; 458 arch_spin_lock_setup(0); 459 lc->br_r1_trampoline = 0x07f1; /* br %r1 */ 460 461 set_prefix((u32)(unsigned long) lc); 462 lowcore_ptr[0] = lc; 463 } 464 465 static void __init setup_lowcore_dat_on(void) 466 { 467 __ctl_clear_bit(0, 28); 468 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; 469 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; 470 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; 471 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; 472 __ctl_set_bit(0, 28); 473 } 474 475 static struct resource code_resource = { 476 .name = "Kernel code", 477 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 478 }; 479 480 static struct resource data_resource = { 481 .name = "Kernel data", 482 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 483 }; 484 485 static struct resource bss_resource = { 486 .name = "Kernel bss", 487 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 488 }; 489 490 static struct resource __initdata *standard_resources[] = { 491 &code_resource, 492 &data_resource, 493 &bss_resource, 494 }; 495 496 static void __init setup_resources(void) 497 { 498 struct resource *res, *std_res, *sub_res; 499 struct memblock_region *reg; 500 int j; 501 502 code_resource.start = (unsigned long) _text; 503 code_resource.end = (unsigned long) _etext - 1; 504 data_resource.start = (unsigned long) _etext; 505 data_resource.end = (unsigned long) _edata - 1; 506 bss_resource.start = (unsigned long) __bss_start; 507 bss_resource.end = (unsigned long) __bss_stop - 1; 508 509 for_each_memblock(memory, reg) { 510 res = memblock_alloc(sizeof(*res), 8); 511 if (!res) 512 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 513 __func__, sizeof(*res), 8); 514 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 515 516 res->name = "System RAM"; 517 res->start = reg->base; 518 res->end = reg->base + reg->size - 1; 519 request_resource(&iomem_resource, res); 520 521 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 522 std_res = standard_resources[j]; 523 if (std_res->start < res->start || 524 std_res->start > res->end) 525 continue; 526 if (std_res->end > res->end) { 527 sub_res = memblock_alloc(sizeof(*sub_res), 8); 528 if (!sub_res) 529 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 530 __func__, sizeof(*sub_res), 8); 531 *sub_res = *std_res; 532 sub_res->end = res->end; 533 std_res->start = res->end + 1; 534 request_resource(res, sub_res); 535 } else { 536 request_resource(res, std_res); 537 } 538 } 539 } 540 #ifdef CONFIG_CRASH_DUMP 541 /* 542 * Re-add removed crash kernel memory as reserved memory. This makes 543 * sure it will be mapped with the identity mapping and struct pages 544 * will be created, so it can be resized later on. 545 * However add it later since the crash kernel resource should not be 546 * part of the System RAM resource. 547 */ 548 if (crashk_res.end) { 549 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); 550 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 551 insert_resource(&iomem_resource, &crashk_res); 552 } 553 #endif 554 } 555 556 static void __init setup_memory_end(void) 557 { 558 unsigned long vmax, tmp; 559 560 /* Choose kernel address space layout: 3 or 4 levels. */ 561 if (IS_ENABLED(CONFIG_KASAN)) { 562 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING) 563 ? _REGION1_SIZE 564 : _REGION2_SIZE; 565 } else { 566 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 567 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 568 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) 569 vmax = _REGION2_SIZE; /* 3-level kernel page table */ 570 else 571 vmax = _REGION1_SIZE; /* 4-level kernel page table */ 572 } 573 574 /* module area is at the end of the kernel address space. */ 575 MODULES_END = vmax; 576 MODULES_VADDR = MODULES_END - MODULES_LEN; 577 VMALLOC_END = MODULES_VADDR; 578 VMALLOC_START = VMALLOC_END - vmalloc_size; 579 580 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 581 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 582 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 583 tmp = SECTION_ALIGN_UP(tmp); 584 tmp = VMALLOC_START - tmp * sizeof(struct page); 585 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 586 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 587 vmemmap = (struct page *) tmp; 588 589 /* Take care that memory_end is set and <= vmemmap */ 590 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap); 591 #ifdef CONFIG_KASAN 592 /* fit in kasan shadow memory region between 1:1 and vmemmap */ 593 memory_end = min(memory_end, KASAN_SHADOW_START); 594 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END); 595 #endif 596 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 597 memblock_remove(memory_end, ULONG_MAX); 598 599 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20); 600 } 601 602 #ifdef CONFIG_CRASH_DUMP 603 604 /* 605 * When kdump is enabled, we have to ensure that no memory from 606 * the area [0 - crashkernel memory size] and 607 * [crashk_res.start - crashk_res.end] is set offline. 608 */ 609 static int kdump_mem_notifier(struct notifier_block *nb, 610 unsigned long action, void *data) 611 { 612 struct memory_notify *arg = data; 613 614 if (action != MEM_GOING_OFFLINE) 615 return NOTIFY_OK; 616 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 617 return NOTIFY_BAD; 618 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 619 return NOTIFY_OK; 620 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 621 return NOTIFY_OK; 622 return NOTIFY_BAD; 623 } 624 625 static struct notifier_block kdump_mem_nb = { 626 .notifier_call = kdump_mem_notifier, 627 }; 628 629 #endif 630 631 /* 632 * Make sure that the area behind memory_end is protected 633 */ 634 static void reserve_memory_end(void) 635 { 636 if (memory_end_set) 637 memblock_reserve(memory_end, ULONG_MAX); 638 } 639 640 /* 641 * Make sure that oldmem, where the dump is stored, is protected 642 */ 643 static void reserve_oldmem(void) 644 { 645 #ifdef CONFIG_CRASH_DUMP 646 if (OLDMEM_BASE) 647 /* Forget all memory above the running kdump system */ 648 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 649 #endif 650 } 651 652 /* 653 * Make sure that oldmem, where the dump is stored, is protected 654 */ 655 static void remove_oldmem(void) 656 { 657 #ifdef CONFIG_CRASH_DUMP 658 if (OLDMEM_BASE) 659 /* Forget all memory above the running kdump system */ 660 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 661 #endif 662 } 663 664 /* 665 * Reserve memory for kdump kernel to be loaded with kexec 666 */ 667 static void __init reserve_crashkernel(void) 668 { 669 #ifdef CONFIG_CRASH_DUMP 670 unsigned long long crash_base, crash_size; 671 phys_addr_t low, high; 672 int rc; 673 674 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 675 &crash_base); 676 677 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 678 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 679 if (rc || crash_size == 0) 680 return; 681 682 if (memblock.memory.regions[0].size < crash_size) { 683 pr_info("crashkernel reservation failed: %s\n", 684 "first memory chunk must be at least crashkernel size"); 685 return; 686 } 687 688 low = crash_base ?: OLDMEM_BASE; 689 high = low + crash_size; 690 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 691 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 692 crash_base = low; 693 } else { 694 /* Find suitable area in free memory */ 695 low = max_t(unsigned long, crash_size, sclp.hsa_size); 696 high = crash_base ? crash_base + crash_size : ULONG_MAX; 697 698 if (crash_base && crash_base < low) { 699 pr_info("crashkernel reservation failed: %s\n", 700 "crash_base too low"); 701 return; 702 } 703 low = crash_base ?: low; 704 crash_base = memblock_find_in_range(low, high, crash_size, 705 KEXEC_CRASH_MEM_ALIGN); 706 } 707 708 if (!crash_base) { 709 pr_info("crashkernel reservation failed: %s\n", 710 "no suitable area found"); 711 return; 712 } 713 714 if (register_memory_notifier(&kdump_mem_nb)) 715 return; 716 717 if (!OLDMEM_BASE && MACHINE_IS_VM) 718 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 719 crashk_res.start = crash_base; 720 crashk_res.end = crash_base + crash_size - 1; 721 memblock_remove(crash_base, crash_size); 722 pr_info("Reserving %lluMB of memory at %lluMB " 723 "for crashkernel (System RAM: %luMB)\n", 724 crash_size >> 20, crash_base >> 20, 725 (unsigned long)memblock.memory.total_size >> 20); 726 os_info_crashkernel_add(crash_base, crash_size); 727 #endif 728 } 729 730 /* 731 * Reserve the initrd from being used by memblock 732 */ 733 static void __init reserve_initrd(void) 734 { 735 #ifdef CONFIG_BLK_DEV_INITRD 736 if (!INITRD_START || !INITRD_SIZE) 737 return; 738 initrd_start = INITRD_START; 739 initrd_end = initrd_start + INITRD_SIZE; 740 memblock_reserve(INITRD_START, INITRD_SIZE); 741 #endif 742 } 743 744 /* 745 * Reserve the memory area used to pass the certificate lists 746 */ 747 static void __init reserve_certificate_list(void) 748 { 749 if (ipl_cert_list_addr) 750 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 751 } 752 753 static void __init reserve_mem_detect_info(void) 754 { 755 unsigned long start, size; 756 757 get_mem_detect_reserved(&start, &size); 758 if (size) 759 memblock_reserve(start, size); 760 } 761 762 static void __init free_mem_detect_info(void) 763 { 764 unsigned long start, size; 765 766 get_mem_detect_reserved(&start, &size); 767 if (size) 768 memblock_free(start, size); 769 } 770 771 static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size) 772 { 773 memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n", 774 start, start + size - 1); 775 memblock_add_range(&memblock.memory, start, size, 0, 0); 776 memblock_add_range(&memblock.physmem, start, size, 0, 0); 777 } 778 779 static const char * __init get_mem_info_source(void) 780 { 781 switch (mem_detect.info_source) { 782 case MEM_DETECT_SCLP_STOR_INFO: 783 return "sclp storage info"; 784 case MEM_DETECT_DIAG260: 785 return "diag260"; 786 case MEM_DETECT_SCLP_READ_INFO: 787 return "sclp read info"; 788 case MEM_DETECT_BIN_SEARCH: 789 return "binary search"; 790 } 791 return "none"; 792 } 793 794 static void __init memblock_add_mem_detect_info(void) 795 { 796 unsigned long start, end; 797 int i; 798 799 memblock_dbg("physmem info source: %s (%hhd)\n", 800 get_mem_info_source(), mem_detect.info_source); 801 /* keep memblock lists close to the kernel */ 802 memblock_set_bottom_up(true); 803 for_each_mem_detect_block(i, &start, &end) 804 memblock_physmem_add(start, end - start); 805 memblock_set_bottom_up(false); 806 memblock_dump_all(); 807 } 808 809 /* 810 * Check for initrd being in usable memory 811 */ 812 static void __init check_initrd(void) 813 { 814 #ifdef CONFIG_BLK_DEV_INITRD 815 if (INITRD_START && INITRD_SIZE && 816 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 817 pr_err("The initial RAM disk does not fit into the memory\n"); 818 memblock_free(INITRD_START, INITRD_SIZE); 819 initrd_start = initrd_end = 0; 820 } 821 #endif 822 } 823 824 /* 825 * Reserve memory used for lowcore/command line/kernel image. 826 */ 827 static void __init reserve_kernel(void) 828 { 829 unsigned long start_pfn = PFN_UP(__pa(_end)); 830 831 memblock_reserve(0, HEAD_END); 832 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 833 - (unsigned long)_stext); 834 memblock_reserve(__sdma, __edma - __sdma); 835 } 836 837 static void __init setup_memory(void) 838 { 839 struct memblock_region *reg; 840 841 /* 842 * Init storage key for present memory 843 */ 844 for_each_memblock(memory, reg) { 845 storage_key_init_range(reg->base, reg->base + reg->size); 846 } 847 psw_set_key(PAGE_DEFAULT_KEY); 848 849 /* Only cosmetics */ 850 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 851 } 852 853 /* 854 * Setup hardware capabilities. 855 */ 856 static int __init setup_hwcaps(void) 857 { 858 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 859 struct cpuid cpu_id; 860 int i; 861 862 /* 863 * The store facility list bits numbers as found in the principles 864 * of operation are numbered with bit 1UL<<31 as number 0 to 865 * bit 1UL<<0 as number 31. 866 * Bit 0: instructions named N3, "backported" to esa-mode 867 * Bit 2: z/Architecture mode is active 868 * Bit 7: the store-facility-list-extended facility is installed 869 * Bit 17: the message-security assist is installed 870 * Bit 19: the long-displacement facility is installed 871 * Bit 21: the extended-immediate facility is installed 872 * Bit 22: extended-translation facility 3 is installed 873 * Bit 30: extended-translation facility 3 enhancement facility 874 * These get translated to: 875 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 876 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 877 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 878 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 879 */ 880 for (i = 0; i < 6; i++) 881 if (test_facility(stfl_bits[i])) 882 elf_hwcap |= 1UL << i; 883 884 if (test_facility(22) && test_facility(30)) 885 elf_hwcap |= HWCAP_S390_ETF3EH; 886 887 /* 888 * Check for additional facilities with store-facility-list-extended. 889 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 890 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 891 * as stored by stfl, bits 32-xxx contain additional facilities. 892 * How many facility words are stored depends on the number of 893 * doublewords passed to the instruction. The additional facilities 894 * are: 895 * Bit 42: decimal floating point facility is installed 896 * Bit 44: perform floating point operation facility is installed 897 * translated to: 898 * HWCAP_S390_DFP bit 6 (42 && 44). 899 */ 900 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 901 elf_hwcap |= HWCAP_S390_DFP; 902 903 /* 904 * Huge page support HWCAP_S390_HPAGE is bit 7. 905 */ 906 if (MACHINE_HAS_EDAT1) 907 elf_hwcap |= HWCAP_S390_HPAGE; 908 909 /* 910 * 64-bit register support for 31-bit processes 911 * HWCAP_S390_HIGH_GPRS is bit 9. 912 */ 913 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 914 915 /* 916 * Transactional execution support HWCAP_S390_TE is bit 10. 917 */ 918 if (MACHINE_HAS_TE) 919 elf_hwcap |= HWCAP_S390_TE; 920 921 /* 922 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 923 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 924 * instead of facility bit 129. 925 */ 926 if (MACHINE_HAS_VX) { 927 elf_hwcap |= HWCAP_S390_VXRS; 928 if (test_facility(134)) 929 elf_hwcap |= HWCAP_S390_VXRS_EXT; 930 if (test_facility(135)) 931 elf_hwcap |= HWCAP_S390_VXRS_BCD; 932 if (test_facility(148)) 933 elf_hwcap |= HWCAP_S390_VXRS_EXT2; 934 if (test_facility(152)) 935 elf_hwcap |= HWCAP_S390_VXRS_PDE; 936 } 937 if (test_facility(150)) 938 elf_hwcap |= HWCAP_S390_SORT; 939 if (test_facility(151)) 940 elf_hwcap |= HWCAP_S390_DFLT; 941 942 /* 943 * Guarded storage support HWCAP_S390_GS is bit 12. 944 */ 945 if (MACHINE_HAS_GS) 946 elf_hwcap |= HWCAP_S390_GS; 947 948 get_cpu_id(&cpu_id); 949 add_device_randomness(&cpu_id, sizeof(cpu_id)); 950 switch (cpu_id.machine) { 951 case 0x2064: 952 case 0x2066: 953 default: /* Use "z900" as default for 64 bit kernels. */ 954 strcpy(elf_platform, "z900"); 955 break; 956 case 0x2084: 957 case 0x2086: 958 strcpy(elf_platform, "z990"); 959 break; 960 case 0x2094: 961 case 0x2096: 962 strcpy(elf_platform, "z9-109"); 963 break; 964 case 0x2097: 965 case 0x2098: 966 strcpy(elf_platform, "z10"); 967 break; 968 case 0x2817: 969 case 0x2818: 970 strcpy(elf_platform, "z196"); 971 break; 972 case 0x2827: 973 case 0x2828: 974 strcpy(elf_platform, "zEC12"); 975 break; 976 case 0x2964: 977 case 0x2965: 978 strcpy(elf_platform, "z13"); 979 break; 980 case 0x3906: 981 case 0x3907: 982 strcpy(elf_platform, "z14"); 983 break; 984 case 0x8561: 985 case 0x8562: 986 strcpy(elf_platform, "z15"); 987 break; 988 } 989 990 /* 991 * Virtualization support HWCAP_INT_SIE is bit 0. 992 */ 993 if (sclp.has_sief2) 994 int_hwcap |= HWCAP_INT_SIE; 995 996 return 0; 997 } 998 arch_initcall(setup_hwcaps); 999 1000 /* 1001 * Add system information as device randomness 1002 */ 1003 static void __init setup_randomness(void) 1004 { 1005 struct sysinfo_3_2_2 *vmms; 1006 1007 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE, 1008 PAGE_SIZE); 1009 if (!vmms) 1010 panic("Failed to allocate memory for sysinfo structure\n"); 1011 1012 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 1013 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 1014 memblock_free((unsigned long) vmms, PAGE_SIZE); 1015 } 1016 1017 /* 1018 * Find the correct size for the task_struct. This depends on 1019 * the size of the struct fpu at the end of the thread_struct 1020 * which is embedded in the task_struct. 1021 */ 1022 static void __init setup_task_size(void) 1023 { 1024 int task_size = sizeof(struct task_struct); 1025 1026 if (!MACHINE_HAS_VX) { 1027 task_size -= sizeof(__vector128) * __NUM_VXRS; 1028 task_size += sizeof(freg_t) * __NUM_FPRS; 1029 } 1030 arch_task_struct_size = task_size; 1031 } 1032 1033 /* 1034 * Issue diagnose 318 to set the control program name and 1035 * version codes. 1036 */ 1037 static void __init setup_control_program_code(void) 1038 { 1039 union diag318_info diag318_info = { 1040 .cpnc = CPNC_LINUX, 1041 .cpvc_linux = 0, 1042 .cpvc_distro = {0}, 1043 }; 1044 1045 if (!sclp.has_diag318) 1046 return; 1047 1048 diag_stat_inc(DIAG_STAT_X318); 1049 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 1050 } 1051 1052 /* 1053 * Print the component list from the IPL report 1054 */ 1055 static void __init log_component_list(void) 1056 { 1057 struct ipl_rb_component_entry *ptr, *end; 1058 char *str; 1059 1060 if (!early_ipl_comp_list_addr) 1061 return; 1062 if (ipl_block.hdr.flags & IPL_PL_FLAG_IPLSR) 1063 pr_info("Linux is running with Secure-IPL enabled\n"); 1064 else 1065 pr_info("Linux is running with Secure-IPL disabled\n"); 1066 ptr = (void *) early_ipl_comp_list_addr; 1067 end = (void *) ptr + early_ipl_comp_list_size; 1068 pr_info("The IPL report contains the following components:\n"); 1069 while (ptr < end) { 1070 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 1071 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 1072 str = "signed, verified"; 1073 else 1074 str = "signed, verification failed"; 1075 } else { 1076 str = "not signed"; 1077 } 1078 pr_info("%016llx - %016llx (%s)\n", 1079 ptr->addr, ptr->addr + ptr->len, str); 1080 ptr++; 1081 } 1082 } 1083 1084 /* 1085 * Setup function called from init/main.c just after the banner 1086 * was printed. 1087 */ 1088 1089 void __init setup_arch(char **cmdline_p) 1090 { 1091 /* 1092 * print what head.S has found out about the machine 1093 */ 1094 if (MACHINE_IS_VM) 1095 pr_info("Linux is running as a z/VM " 1096 "guest operating system in 64-bit mode\n"); 1097 else if (MACHINE_IS_KVM) 1098 pr_info("Linux is running under KVM in 64-bit mode\n"); 1099 else if (MACHINE_IS_LPAR) 1100 pr_info("Linux is running natively in 64-bit mode\n"); 1101 else 1102 pr_info("Linux is running as a guest in 64-bit mode\n"); 1103 1104 log_component_list(); 1105 1106 /* Have one command line that is parsed and saved in /proc/cmdline */ 1107 /* boot_command_line has been already set up in early.c */ 1108 *cmdline_p = boot_command_line; 1109 1110 ROOT_DEV = Root_RAM0; 1111 1112 init_mm.start_code = (unsigned long) _text; 1113 init_mm.end_code = (unsigned long) _etext; 1114 init_mm.end_data = (unsigned long) _edata; 1115 init_mm.brk = (unsigned long) _end; 1116 1117 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 1118 nospec_auto_detect(); 1119 1120 parse_early_param(); 1121 #ifdef CONFIG_CRASH_DUMP 1122 /* Deactivate elfcorehdr= kernel parameter */ 1123 elfcorehdr_addr = ELFCORE_ADDR_MAX; 1124 #endif 1125 1126 os_info_init(); 1127 setup_ipl(); 1128 setup_task_size(); 1129 setup_control_program_code(); 1130 1131 /* Do some memory reservations *before* memory is added to memblock */ 1132 reserve_memory_end(); 1133 reserve_oldmem(); 1134 reserve_kernel(); 1135 reserve_initrd(); 1136 reserve_certificate_list(); 1137 reserve_mem_detect_info(); 1138 memblock_allow_resize(); 1139 1140 /* Get information about *all* installed memory */ 1141 memblock_add_mem_detect_info(); 1142 1143 free_mem_detect_info(); 1144 remove_oldmem(); 1145 1146 /* 1147 * Make sure all chunks are MAX_ORDER aligned so we don't need the 1148 * extra checks that HOLES_IN_ZONE would require. 1149 * 1150 * Is this still required? 1151 */ 1152 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 1153 1154 setup_memory_end(); 1155 setup_memory(); 1156 dma_contiguous_reserve(memory_end); 1157 vmcp_cma_reserve(); 1158 1159 check_initrd(); 1160 reserve_crashkernel(); 1161 #ifdef CONFIG_CRASH_DUMP 1162 /* 1163 * Be aware that smp_save_dump_cpus() triggers a system reset. 1164 * Therefore CPU and device initialization should be done afterwards. 1165 */ 1166 smp_save_dump_cpus(); 1167 #endif 1168 1169 setup_resources(); 1170 setup_lowcore_dat_off(); 1171 smp_fill_possible_mask(); 1172 cpu_detect_mhz_feature(); 1173 cpu_init(); 1174 numa_setup(); 1175 smp_detect_cpus(); 1176 topology_init_early(); 1177 1178 /* 1179 * Create kernel page tables and switch to virtual addressing. 1180 */ 1181 paging_init(); 1182 1183 /* 1184 * After paging_init created the kernel page table, the new PSWs 1185 * in lowcore can now run with DAT enabled. 1186 */ 1187 setup_lowcore_dat_on(); 1188 1189 /* Setup default console */ 1190 conmode_default(); 1191 set_preferred_console(); 1192 1193 apply_alternative_instructions(); 1194 if (IS_ENABLED(CONFIG_EXPOLINE)) 1195 nospec_init_branches(); 1196 1197 /* Setup zfcpdump support */ 1198 setup_zfcpdump(); 1199 1200 /* Add system specific data to the random pool */ 1201 setup_randomness(); 1202 } 1203