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