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-map-ops.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 #include <linux/hugetlb.h> 53 #include <linux/kmemleak.h> 54 55 #include <asm/archrandom.h> 56 #include <asm/boot_data.h> 57 #include <asm/ipl.h> 58 #include <asm/facility.h> 59 #include <asm/smp.h> 60 #include <asm/mmu_context.h> 61 #include <asm/cpcmd.h> 62 #include <asm/abs_lowcore.h> 63 #include <asm/nmi.h> 64 #include <asm/irq.h> 65 #include <asm/page.h> 66 #include <asm/ptrace.h> 67 #include <asm/sections.h> 68 #include <asm/ebcdic.h> 69 #include <asm/diag.h> 70 #include <asm/os_info.h> 71 #include <asm/sclp.h> 72 #include <asm/stacktrace.h> 73 #include <asm/sysinfo.h> 74 #include <asm/numa.h> 75 #include <asm/alternative.h> 76 #include <asm/nospec-branch.h> 77 #include <asm/physmem_info.h> 78 #include <asm/maccess.h> 79 #include <asm/uv.h> 80 #include <asm/asm-offsets.h> 81 #include "entry.h" 82 83 /* 84 * Machine setup.. 85 */ 86 unsigned int console_mode = 0; 87 EXPORT_SYMBOL(console_mode); 88 89 unsigned int console_devno = -1; 90 EXPORT_SYMBOL(console_devno); 91 92 unsigned int console_irq = -1; 93 EXPORT_SYMBOL(console_irq); 94 95 /* 96 * Some code and data needs to stay below 2 GB, even when the kernel would be 97 * relocated above 2 GB, because it has to use 31 bit addresses. 98 * Such code and data is part of the .amode31 section. 99 */ 100 char __amode31_ref *__samode31 = _samode31; 101 char __amode31_ref *__eamode31 = _eamode31; 102 char __amode31_ref *__stext_amode31 = _stext_amode31; 103 char __amode31_ref *__etext_amode31 = _etext_amode31; 104 struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table; 105 struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table; 106 107 /* 108 * Control registers CR2, CR5 and CR15 are initialized with addresses 109 * of tables that must be placed below 2G which is handled by the AMODE31 110 * sections. 111 * Because the AMODE31 sections are relocated below 2G at startup, 112 * the content of control registers CR2, CR5 and CR15 must be updated 113 * with new addresses after the relocation. The initial initialization of 114 * control registers occurs in head64.S and then gets updated again after AMODE31 115 * relocation. We must access the relevant AMODE31 tables indirectly via 116 * pointers placed in the .amode31.refs linker section. Those pointers get 117 * updated automatically during AMODE31 relocation and always contain a valid 118 * address within AMODE31 sections. 119 */ 120 121 static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64); 122 123 static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = { 124 [1] = 0xffffffffffffffff 125 }; 126 127 static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = { 128 0x80000000, 0, 0, 0, 129 0x80000000, 0, 0, 0, 130 0x80000000, 0, 0, 0, 131 0x80000000, 0, 0, 0, 132 0x80000000, 0, 0, 0, 133 0x80000000, 0, 0, 0, 134 0x80000000, 0, 0, 0, 135 0x80000000, 0, 0, 0 136 }; 137 138 static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = { 139 0, 0, 0x89000000, 0, 140 0, 0, 0x8a000000, 0 141 }; 142 143 static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31; 144 static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31; 145 static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31; 146 static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31; 147 148 unsigned long __bootdata_preserved(max_mappable); 149 unsigned long __bootdata(ident_map_size); 150 struct physmem_info __bootdata(physmem_info); 151 152 unsigned long __bootdata_preserved(__kaslr_offset); 153 int __bootdata_preserved(__kaslr_enabled); 154 unsigned int __bootdata_preserved(zlib_dfltcc_support); 155 EXPORT_SYMBOL(zlib_dfltcc_support); 156 u64 __bootdata_preserved(stfle_fac_list[16]); 157 EXPORT_SYMBOL(stfle_fac_list); 158 u64 __bootdata_preserved(alt_stfle_fac_list[16]); 159 struct oldmem_data __bootdata_preserved(oldmem_data); 160 161 unsigned long VMALLOC_START; 162 EXPORT_SYMBOL(VMALLOC_START); 163 164 unsigned long VMALLOC_END; 165 EXPORT_SYMBOL(VMALLOC_END); 166 167 struct page *vmemmap; 168 EXPORT_SYMBOL(vmemmap); 169 unsigned long vmemmap_size; 170 171 unsigned long MODULES_VADDR; 172 unsigned long MODULES_END; 173 174 /* An array with a pointer to the lowcore of every CPU. */ 175 struct lowcore *lowcore_ptr[NR_CPUS]; 176 EXPORT_SYMBOL(lowcore_ptr); 177 178 DEFINE_STATIC_KEY_FALSE(cpu_has_bear); 179 180 /* 181 * The Write Back bit position in the physaddr is given by the SLPC PCI. 182 * Leaving the mask zero always uses write through which is safe 183 */ 184 unsigned long mio_wb_bit_mask __ro_after_init; 185 186 /* 187 * This is set up by the setup-routine at boot-time 188 * for S390 need to find out, what we have to setup 189 * using address 0x10400 ... 190 */ 191 192 #include <asm/setup.h> 193 194 /* 195 * condev= and conmode= setup parameter. 196 */ 197 198 static int __init condev_setup(char *str) 199 { 200 int vdev; 201 202 vdev = simple_strtoul(str, &str, 0); 203 if (vdev >= 0 && vdev < 65536) { 204 console_devno = vdev; 205 console_irq = -1; 206 } 207 return 1; 208 } 209 210 __setup("condev=", condev_setup); 211 212 static void __init set_preferred_console(void) 213 { 214 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 215 add_preferred_console("ttyS", 0, NULL); 216 else if (CONSOLE_IS_3270) 217 add_preferred_console("tty3270", 0, NULL); 218 else if (CONSOLE_IS_VT220) 219 add_preferred_console("ttysclp", 0, NULL); 220 else if (CONSOLE_IS_HVC) 221 add_preferred_console("hvc", 0, NULL); 222 } 223 224 static int __init conmode_setup(char *str) 225 { 226 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 227 if (!strcmp(str, "hwc") || !strcmp(str, "sclp")) 228 SET_CONSOLE_SCLP; 229 #endif 230 #if defined(CONFIG_TN3215_CONSOLE) 231 if (!strcmp(str, "3215")) 232 SET_CONSOLE_3215; 233 #endif 234 #if defined(CONFIG_TN3270_CONSOLE) 235 if (!strcmp(str, "3270")) 236 SET_CONSOLE_3270; 237 #endif 238 set_preferred_console(); 239 return 1; 240 } 241 242 __setup("conmode=", conmode_setup); 243 244 static void __init conmode_default(void) 245 { 246 char query_buffer[1024]; 247 char *ptr; 248 249 if (MACHINE_IS_VM) { 250 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 251 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 252 ptr = strstr(query_buffer, "SUBCHANNEL ="); 253 console_irq = simple_strtoul(ptr + 13, NULL, 16); 254 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 255 ptr = strstr(query_buffer, "CONMODE"); 256 /* 257 * Set the conmode to 3215 so that the device recognition 258 * will set the cu_type of the console to 3215. If the 259 * conmode is 3270 and we don't set it back then both 260 * 3215 and the 3270 driver will try to access the console 261 * device (3215 as console and 3270 as normal tty). 262 */ 263 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 264 if (ptr == NULL) { 265 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 266 SET_CONSOLE_SCLP; 267 #endif 268 return; 269 } 270 if (str_has_prefix(ptr + 8, "3270")) { 271 #if defined(CONFIG_TN3270_CONSOLE) 272 SET_CONSOLE_3270; 273 #elif defined(CONFIG_TN3215_CONSOLE) 274 SET_CONSOLE_3215; 275 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 276 SET_CONSOLE_SCLP; 277 #endif 278 } else if (str_has_prefix(ptr + 8, "3215")) { 279 #if defined(CONFIG_TN3215_CONSOLE) 280 SET_CONSOLE_3215; 281 #elif defined(CONFIG_TN3270_CONSOLE) 282 SET_CONSOLE_3270; 283 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 284 SET_CONSOLE_SCLP; 285 #endif 286 } 287 } else if (MACHINE_IS_KVM) { 288 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 289 SET_CONSOLE_VT220; 290 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 291 SET_CONSOLE_SCLP; 292 else 293 SET_CONSOLE_HVC; 294 } else { 295 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 296 SET_CONSOLE_SCLP; 297 #endif 298 } 299 } 300 301 #ifdef CONFIG_CRASH_DUMP 302 static void __init setup_zfcpdump(void) 303 { 304 if (!is_ipl_type_dump()) 305 return; 306 if (oldmem_data.start) 307 return; 308 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 309 console_loglevel = 2; 310 } 311 #else 312 static inline void setup_zfcpdump(void) {} 313 #endif /* CONFIG_CRASH_DUMP */ 314 315 /* 316 * Reboot, halt and power_off stubs. They just call _machine_restart, 317 * _machine_halt or _machine_power_off. 318 */ 319 320 void machine_restart(char *command) 321 { 322 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 323 /* 324 * Only unblank the console if we are called in enabled 325 * context or a bust_spinlocks cleared the way for us. 326 */ 327 console_unblank(); 328 _machine_restart(command); 329 } 330 331 void machine_halt(void) 332 { 333 if (!in_interrupt() || oops_in_progress) 334 /* 335 * Only unblank the console if we are called in enabled 336 * context or a bust_spinlocks cleared the way for us. 337 */ 338 console_unblank(); 339 _machine_halt(); 340 } 341 342 void machine_power_off(void) 343 { 344 if (!in_interrupt() || oops_in_progress) 345 /* 346 * Only unblank the console if we are called in enabled 347 * context or a bust_spinlocks cleared the way for us. 348 */ 349 console_unblank(); 350 _machine_power_off(); 351 } 352 353 /* 354 * Dummy power off function. 355 */ 356 void (*pm_power_off)(void) = machine_power_off; 357 EXPORT_SYMBOL_GPL(pm_power_off); 358 359 void *restart_stack; 360 361 unsigned long stack_alloc(void) 362 { 363 #ifdef CONFIG_VMAP_STACK 364 void *ret; 365 366 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP, 367 NUMA_NO_NODE, __builtin_return_address(0)); 368 kmemleak_not_leak(ret); 369 return (unsigned long)ret; 370 #else 371 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 372 #endif 373 } 374 375 void stack_free(unsigned long stack) 376 { 377 #ifdef CONFIG_VMAP_STACK 378 vfree((void *) stack); 379 #else 380 free_pages(stack, THREAD_SIZE_ORDER); 381 #endif 382 } 383 384 void __init __noreturn arch_call_rest_init(void) 385 { 386 smp_reinit_ipl_cpu(); 387 rest_init(); 388 } 389 390 static unsigned long __init stack_alloc_early(void) 391 { 392 unsigned long stack; 393 394 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE); 395 if (!stack) { 396 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 397 __func__, THREAD_SIZE, THREAD_SIZE); 398 } 399 return stack; 400 } 401 402 static void __init setup_lowcore(void) 403 { 404 struct lowcore *lc, *abs_lc; 405 406 /* 407 * Setup lowcore for boot cpu 408 */ 409 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 410 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 411 if (!lc) 412 panic("%s: Failed to allocate %zu bytes align=%zx\n", 413 __func__, sizeof(*lc), sizeof(*lc)); 414 415 lc->restart_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT; 416 lc->restart_psw.addr = __pa(restart_int_handler); 417 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 418 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 419 lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 420 lc->svc_new_psw.addr = (unsigned long) system_call; 421 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 422 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 423 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 424 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 425 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 426 lc->io_new_psw.addr = (unsigned long) io_int_handler; 427 lc->clock_comparator = clock_comparator_max; 428 lc->current_task = (unsigned long)&init_task; 429 lc->lpp = LPP_MAGIC; 430 lc->machine_flags = S390_lowcore.machine_flags; 431 lc->preempt_count = S390_lowcore.preempt_count; 432 nmi_alloc_mcesa_early(&lc->mcesad); 433 lc->sys_enter_timer = S390_lowcore.sys_enter_timer; 434 lc->exit_timer = S390_lowcore.exit_timer; 435 lc->user_timer = S390_lowcore.user_timer; 436 lc->system_timer = S390_lowcore.system_timer; 437 lc->steal_timer = S390_lowcore.steal_timer; 438 lc->last_update_timer = S390_lowcore.last_update_timer; 439 lc->last_update_clock = S390_lowcore.last_update_clock; 440 /* 441 * Allocate the global restart stack which is the same for 442 * all CPUs in case *one* of them does a PSW restart. 443 */ 444 restart_stack = (void *)(stack_alloc_early() + STACK_INIT_OFFSET); 445 lc->mcck_stack = stack_alloc_early() + STACK_INIT_OFFSET; 446 lc->async_stack = stack_alloc_early() + STACK_INIT_OFFSET; 447 lc->nodat_stack = stack_alloc_early() + STACK_INIT_OFFSET; 448 lc->kernel_stack = S390_lowcore.kernel_stack; 449 /* 450 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 451 * restart data to the absolute zero lowcore. This is necessary if 452 * PSW restart is done on an offline CPU that has lowcore zero. 453 */ 454 lc->restart_stack = (unsigned long) restart_stack; 455 lc->restart_fn = (unsigned long) do_restart; 456 lc->restart_data = 0; 457 lc->restart_source = -1U; 458 __ctl_store(lc->cregs_save_area, 0, 15); 459 lc->spinlock_lockval = arch_spin_lockval(0); 460 lc->spinlock_index = 0; 461 arch_spin_lock_setup(0); 462 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); 463 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); 464 lc->preempt_count = PREEMPT_DISABLED; 465 lc->kernel_asce = S390_lowcore.kernel_asce; 466 lc->user_asce = S390_lowcore.user_asce; 467 468 abs_lc = get_abs_lowcore(); 469 abs_lc->restart_stack = lc->restart_stack; 470 abs_lc->restart_fn = lc->restart_fn; 471 abs_lc->restart_data = lc->restart_data; 472 abs_lc->restart_source = lc->restart_source; 473 abs_lc->restart_psw = lc->restart_psw; 474 abs_lc->restart_flags = RESTART_FLAG_CTLREGS; 475 memcpy(abs_lc->cregs_save_area, lc->cregs_save_area, sizeof(abs_lc->cregs_save_area)); 476 abs_lc->program_new_psw = lc->program_new_psw; 477 abs_lc->mcesad = lc->mcesad; 478 put_abs_lowcore(abs_lc); 479 480 set_prefix(__pa(lc)); 481 lowcore_ptr[0] = lc; 482 if (abs_lowcore_map(0, lowcore_ptr[0], false)) 483 panic("Couldn't setup absolute lowcore"); 484 } 485 486 static struct resource code_resource = { 487 .name = "Kernel code", 488 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 489 }; 490 491 static struct resource data_resource = { 492 .name = "Kernel data", 493 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 494 }; 495 496 static struct resource bss_resource = { 497 .name = "Kernel bss", 498 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 499 }; 500 501 static struct resource __initdata *standard_resources[] = { 502 &code_resource, 503 &data_resource, 504 &bss_resource, 505 }; 506 507 static void __init setup_resources(void) 508 { 509 struct resource *res, *std_res, *sub_res; 510 phys_addr_t start, end; 511 int j; 512 u64 i; 513 514 code_resource.start = (unsigned long) _text; 515 code_resource.end = (unsigned long) _etext - 1; 516 data_resource.start = (unsigned long) _etext; 517 data_resource.end = (unsigned long) _edata - 1; 518 bss_resource.start = (unsigned long) __bss_start; 519 bss_resource.end = (unsigned long) __bss_stop - 1; 520 521 for_each_mem_range(i, &start, &end) { 522 res = memblock_alloc(sizeof(*res), 8); 523 if (!res) 524 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 525 __func__, sizeof(*res), 8); 526 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 527 528 res->name = "System RAM"; 529 res->start = start; 530 /* 531 * In memblock, end points to the first byte after the 532 * range while in resources, end points to the last byte in 533 * the range. 534 */ 535 res->end = end - 1; 536 request_resource(&iomem_resource, res); 537 538 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 539 std_res = standard_resources[j]; 540 if (std_res->start < res->start || 541 std_res->start > res->end) 542 continue; 543 if (std_res->end > res->end) { 544 sub_res = memblock_alloc(sizeof(*sub_res), 8); 545 if (!sub_res) 546 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 547 __func__, sizeof(*sub_res), 8); 548 *sub_res = *std_res; 549 sub_res->end = res->end; 550 std_res->start = res->end + 1; 551 request_resource(res, sub_res); 552 } else { 553 request_resource(res, std_res); 554 } 555 } 556 } 557 #ifdef CONFIG_CRASH_DUMP 558 /* 559 * Re-add removed crash kernel memory as reserved memory. This makes 560 * sure it will be mapped with the identity mapping and struct pages 561 * will be created, so it can be resized later on. 562 * However add it later since the crash kernel resource should not be 563 * part of the System RAM resource. 564 */ 565 if (crashk_res.end) { 566 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 567 0, MEMBLOCK_NONE); 568 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 569 insert_resource(&iomem_resource, &crashk_res); 570 } 571 #endif 572 } 573 574 static void __init setup_memory_end(void) 575 { 576 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size); 577 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20); 578 } 579 580 #ifdef CONFIG_CRASH_DUMP 581 582 /* 583 * When kdump is enabled, we have to ensure that no memory from the area 584 * [0 - crashkernel memory size] is set offline - it will be exchanged with 585 * the crashkernel memory region when kdump is triggered. The crashkernel 586 * memory region can never get offlined (pages are unmovable). 587 */ 588 static int kdump_mem_notifier(struct notifier_block *nb, 589 unsigned long action, void *data) 590 { 591 struct memory_notify *arg = data; 592 593 if (action != MEM_GOING_OFFLINE) 594 return NOTIFY_OK; 595 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 596 return NOTIFY_BAD; 597 return NOTIFY_OK; 598 } 599 600 static struct notifier_block kdump_mem_nb = { 601 .notifier_call = kdump_mem_notifier, 602 }; 603 604 #endif 605 606 /* 607 * Reserve page tables created by decompressor 608 */ 609 static void __init reserve_pgtables(void) 610 { 611 unsigned long start, end; 612 struct reserved_range *range; 613 614 for_each_physmem_reserved_type_range(RR_VMEM, range, &start, &end) 615 memblock_reserve(start, end - start); 616 } 617 618 /* 619 * Reserve memory for kdump kernel to be loaded with kexec 620 */ 621 static void __init reserve_crashkernel(void) 622 { 623 #ifdef CONFIG_CRASH_DUMP 624 unsigned long long crash_base, crash_size; 625 phys_addr_t low, high; 626 int rc; 627 628 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size, 629 &crash_base); 630 631 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 632 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 633 if (rc || crash_size == 0) 634 return; 635 636 if (memblock.memory.regions[0].size < crash_size) { 637 pr_info("crashkernel reservation failed: %s\n", 638 "first memory chunk must be at least crashkernel size"); 639 return; 640 } 641 642 low = crash_base ?: oldmem_data.start; 643 high = low + crash_size; 644 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) { 645 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 646 crash_base = low; 647 } else { 648 /* Find suitable area in free memory */ 649 low = max_t(unsigned long, crash_size, sclp.hsa_size); 650 high = crash_base ? crash_base + crash_size : ULONG_MAX; 651 652 if (crash_base && crash_base < low) { 653 pr_info("crashkernel reservation failed: %s\n", 654 "crash_base too low"); 655 return; 656 } 657 low = crash_base ?: low; 658 crash_base = memblock_phys_alloc_range(crash_size, 659 KEXEC_CRASH_MEM_ALIGN, 660 low, high); 661 } 662 663 if (!crash_base) { 664 pr_info("crashkernel reservation failed: %s\n", 665 "no suitable area found"); 666 return; 667 } 668 669 if (register_memory_notifier(&kdump_mem_nb)) { 670 memblock_phys_free(crash_base, crash_size); 671 return; 672 } 673 674 if (!oldmem_data.start && MACHINE_IS_VM) 675 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 676 crashk_res.start = crash_base; 677 crashk_res.end = crash_base + crash_size - 1; 678 memblock_remove(crash_base, crash_size); 679 pr_info("Reserving %lluMB of memory at %lluMB " 680 "for crashkernel (System RAM: %luMB)\n", 681 crash_size >> 20, crash_base >> 20, 682 (unsigned long)memblock.memory.total_size >> 20); 683 os_info_crashkernel_add(crash_base, crash_size); 684 #endif 685 } 686 687 /* 688 * Reserve the initrd from being used by memblock 689 */ 690 static void __init reserve_initrd(void) 691 { 692 unsigned long addr, size; 693 694 if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || !get_physmem_reserved(RR_INITRD, &addr, &size)) 695 return; 696 initrd_start = (unsigned long)__va(addr); 697 initrd_end = initrd_start + size; 698 memblock_reserve(addr, size); 699 } 700 701 /* 702 * Reserve the memory area used to pass the certificate lists 703 */ 704 static void __init reserve_certificate_list(void) 705 { 706 if (ipl_cert_list_addr) 707 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 708 } 709 710 static void __init reserve_physmem_info(void) 711 { 712 unsigned long addr, size; 713 714 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size)) 715 memblock_reserve(addr, size); 716 } 717 718 static void __init free_physmem_info(void) 719 { 720 unsigned long addr, size; 721 722 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size)) 723 memblock_phys_free(addr, size); 724 } 725 726 static void __init memblock_add_physmem_info(void) 727 { 728 unsigned long start, end; 729 int i; 730 731 pr_debug("physmem info source: %s (%hhd)\n", 732 get_physmem_info_source(), physmem_info.info_source); 733 /* keep memblock lists close to the kernel */ 734 memblock_set_bottom_up(true); 735 for_each_physmem_usable_range(i, &start, &end) 736 memblock_add(start, end - start); 737 for_each_physmem_online_range(i, &start, &end) 738 memblock_physmem_add(start, end - start); 739 memblock_set_bottom_up(false); 740 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0); 741 } 742 743 /* 744 * Reserve memory used for lowcore/command line/kernel image. 745 */ 746 static void __init reserve_kernel(void) 747 { 748 memblock_reserve(0, STARTUP_NORMAL_OFFSET); 749 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long)); 750 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long)); 751 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31); 752 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP); 753 memblock_reserve(__pa(_stext), _end - _stext); 754 } 755 756 static void __init setup_memory(void) 757 { 758 phys_addr_t start, end; 759 u64 i; 760 761 /* 762 * Init storage key for present memory 763 */ 764 for_each_mem_range(i, &start, &end) 765 storage_key_init_range(start, end); 766 767 psw_set_key(PAGE_DEFAULT_KEY); 768 } 769 770 static void __init relocate_amode31_section(void) 771 { 772 unsigned long amode31_size = __eamode31 - __samode31; 773 long amode31_offset, *ptr; 774 775 amode31_offset = physmem_info.reserved[RR_AMODE31].start - (unsigned long)__samode31; 776 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size); 777 778 /* Move original AMODE31 section to the new one */ 779 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size); 780 /* Zero out the old AMODE31 section to catch invalid accesses within it */ 781 memset(__samode31, 0, amode31_size); 782 783 /* Update all AMODE31 region references */ 784 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++) 785 *ptr += amode31_offset; 786 } 787 788 /* This must be called after AMODE31 relocation */ 789 static void __init setup_cr(void) 790 { 791 union ctlreg2 cr2; 792 union ctlreg5 cr5; 793 union ctlreg15 cr15; 794 795 __ctl_duct[1] = (unsigned long)__ctl_aste; 796 __ctl_duct[2] = (unsigned long)__ctl_aste; 797 __ctl_duct[4] = (unsigned long)__ctl_duald; 798 799 /* Update control registers CR2, CR5 and CR15 */ 800 __ctl_store(cr2.val, 2, 2); 801 __ctl_store(cr5.val, 5, 5); 802 __ctl_store(cr15.val, 15, 15); 803 cr2.ducto = (unsigned long)__ctl_duct >> 6; 804 cr5.pasteo = (unsigned long)__ctl_duct >> 6; 805 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3; 806 __ctl_load(cr2.val, 2, 2); 807 __ctl_load(cr5.val, 5, 5); 808 __ctl_load(cr15.val, 15, 15); 809 } 810 811 /* 812 * Add system information as device randomness 813 */ 814 static void __init setup_randomness(void) 815 { 816 struct sysinfo_3_2_2 *vmms; 817 818 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 819 if (!vmms) 820 panic("Failed to allocate memory for sysinfo structure\n"); 821 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 822 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 823 memblock_free(vmms, PAGE_SIZE); 824 825 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG)) 826 static_branch_enable(&s390_arch_random_available); 827 } 828 829 /* 830 * Find the correct size for the task_struct. This depends on 831 * the size of the struct fpu at the end of the thread_struct 832 * which is embedded in the task_struct. 833 */ 834 static void __init setup_task_size(void) 835 { 836 int task_size = sizeof(struct task_struct); 837 838 if (!MACHINE_HAS_VX) { 839 task_size -= sizeof(__vector128) * __NUM_VXRS; 840 task_size += sizeof(freg_t) * __NUM_FPRS; 841 } 842 arch_task_struct_size = task_size; 843 } 844 845 /* 846 * Issue diagnose 318 to set the control program name and 847 * version codes. 848 */ 849 static void __init setup_control_program_code(void) 850 { 851 union diag318_info diag318_info = { 852 .cpnc = CPNC_LINUX, 853 .cpvc = 0, 854 }; 855 856 if (!sclp.has_diag318) 857 return; 858 859 diag_stat_inc(DIAG_STAT_X318); 860 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 861 } 862 863 /* 864 * Print the component list from the IPL report 865 */ 866 static void __init log_component_list(void) 867 { 868 struct ipl_rb_component_entry *ptr, *end; 869 char *str; 870 871 if (!early_ipl_comp_list_addr) 872 return; 873 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) 874 pr_info("Linux is running with Secure-IPL enabled\n"); 875 else 876 pr_info("Linux is running with Secure-IPL disabled\n"); 877 ptr = __va(early_ipl_comp_list_addr); 878 end = (void *) ptr + early_ipl_comp_list_size; 879 pr_info("The IPL report contains the following components:\n"); 880 while (ptr < end) { 881 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 882 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 883 str = "signed, verified"; 884 else 885 str = "signed, verification failed"; 886 } else { 887 str = "not signed"; 888 } 889 pr_info("%016llx - %016llx (%s)\n", 890 ptr->addr, ptr->addr + ptr->len, str); 891 ptr++; 892 } 893 } 894 895 /* 896 * Setup function called from init/main.c just after the banner 897 * was printed. 898 */ 899 900 void __init setup_arch(char **cmdline_p) 901 { 902 /* 903 * print what head.S has found out about the machine 904 */ 905 if (MACHINE_IS_VM) 906 pr_info("Linux is running as a z/VM " 907 "guest operating system in 64-bit mode\n"); 908 else if (MACHINE_IS_KVM) 909 pr_info("Linux is running under KVM in 64-bit mode\n"); 910 else if (MACHINE_IS_LPAR) 911 pr_info("Linux is running natively in 64-bit mode\n"); 912 else 913 pr_info("Linux is running as a guest in 64-bit mode\n"); 914 915 log_component_list(); 916 917 /* Have one command line that is parsed and saved in /proc/cmdline */ 918 /* boot_command_line has been already set up in early.c */ 919 *cmdline_p = boot_command_line; 920 921 ROOT_DEV = Root_RAM0; 922 923 setup_initial_init_mm(_text, _etext, _edata, _end); 924 925 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 926 nospec_auto_detect(); 927 928 jump_label_init(); 929 parse_early_param(); 930 #ifdef CONFIG_CRASH_DUMP 931 /* Deactivate elfcorehdr= kernel parameter */ 932 elfcorehdr_addr = ELFCORE_ADDR_MAX; 933 #endif 934 935 os_info_init(); 936 setup_ipl(); 937 setup_task_size(); 938 setup_control_program_code(); 939 940 /* Do some memory reservations *before* memory is added to memblock */ 941 reserve_pgtables(); 942 reserve_kernel(); 943 reserve_initrd(); 944 reserve_certificate_list(); 945 reserve_physmem_info(); 946 memblock_set_current_limit(ident_map_size); 947 memblock_allow_resize(); 948 949 /* Get information about *all* installed memory */ 950 memblock_add_physmem_info(); 951 952 free_physmem_info(); 953 setup_memory_end(); 954 memblock_dump_all(); 955 setup_memory(); 956 957 relocate_amode31_section(); 958 setup_cr(); 959 setup_uv(); 960 dma_contiguous_reserve(ident_map_size); 961 vmcp_cma_reserve(); 962 if (MACHINE_HAS_EDAT2) 963 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 964 965 reserve_crashkernel(); 966 #ifdef CONFIG_CRASH_DUMP 967 /* 968 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset. 969 * Therefore CPU and device initialization should be done afterwards. 970 */ 971 smp_save_dump_secondary_cpus(); 972 #endif 973 974 setup_resources(); 975 setup_lowcore(); 976 smp_fill_possible_mask(); 977 cpu_detect_mhz_feature(); 978 cpu_init(); 979 numa_setup(); 980 smp_detect_cpus(); 981 topology_init_early(); 982 983 if (test_facility(193)) 984 static_branch_enable(&cpu_has_bear); 985 986 /* 987 * Create kernel page tables. 988 */ 989 paging_init(); 990 991 /* 992 * After paging_init created the kernel page table, the new PSWs 993 * in lowcore can now run with DAT enabled. 994 */ 995 #ifdef CONFIG_CRASH_DUMP 996 smp_save_dump_ipl_cpu(); 997 #endif 998 999 /* Setup default console */ 1000 conmode_default(); 1001 set_preferred_console(); 1002 1003 apply_alternative_instructions(); 1004 if (IS_ENABLED(CONFIG_EXPOLINE)) 1005 nospec_init_branches(); 1006 1007 /* Setup zfcp/nvme dump support */ 1008 setup_zfcpdump(); 1009 1010 /* Add system specific data to the random pool */ 1011 setup_randomness(); 1012 } 1013