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 struct physmem_info __bootdata(physmem_info); 150 151 struct vm_layout __bootdata_preserved(vm_layout); 152 EXPORT_SYMBOL(vm_layout); 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 struct oldmem_data __bootdata_preserved(oldmem_data); 159 160 unsigned long VMALLOC_START; 161 EXPORT_SYMBOL(VMALLOC_START); 162 163 unsigned long VMALLOC_END; 164 EXPORT_SYMBOL(VMALLOC_END); 165 166 struct page *vmemmap; 167 EXPORT_SYMBOL(vmemmap); 168 unsigned long vmemmap_size; 169 170 unsigned long MODULES_VADDR; 171 unsigned long MODULES_END; 172 173 /* An array with a pointer to the lowcore of every CPU. */ 174 struct lowcore *lowcore_ptr[NR_CPUS]; 175 EXPORT_SYMBOL(lowcore_ptr); 176 177 DEFINE_STATIC_KEY_FALSE(cpu_has_bear); 178 179 /* 180 * The Write Back bit position in the physaddr is given by the SLPC PCI. 181 * Leaving the mask zero always uses write through which is safe 182 */ 183 unsigned long mio_wb_bit_mask __ro_after_init; 184 185 /* 186 * This is set up by the setup-routine at boot-time 187 * for S390 need to find out, what we have to setup 188 * using address 0x10400 ... 189 */ 190 191 #include <asm/setup.h> 192 193 /* 194 * condev= and conmode= setup parameter. 195 */ 196 197 static int __init condev_setup(char *str) 198 { 199 int vdev; 200 201 vdev = simple_strtoul(str, &str, 0); 202 if (vdev >= 0 && vdev < 65536) { 203 console_devno = vdev; 204 console_irq = -1; 205 } 206 return 1; 207 } 208 209 __setup("condev=", condev_setup); 210 211 static void __init set_preferred_console(void) 212 { 213 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 214 add_preferred_console("ttyS", 0, NULL); 215 else if (CONSOLE_IS_3270) 216 add_preferred_console("tty3270", 0, NULL); 217 else if (CONSOLE_IS_VT220) 218 add_preferred_console("ttysclp", 0, NULL); 219 else if (CONSOLE_IS_HVC) 220 add_preferred_console("hvc", 0, NULL); 221 } 222 223 static int __init conmode_setup(char *str) 224 { 225 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 226 if (!strcmp(str, "hwc") || !strcmp(str, "sclp")) 227 SET_CONSOLE_SCLP; 228 #endif 229 #if defined(CONFIG_TN3215_CONSOLE) 230 if (!strcmp(str, "3215")) 231 SET_CONSOLE_3215; 232 #endif 233 #if defined(CONFIG_TN3270_CONSOLE) 234 if (!strcmp(str, "3270")) 235 SET_CONSOLE_3270; 236 #endif 237 set_preferred_console(); 238 return 1; 239 } 240 241 __setup("conmode=", conmode_setup); 242 243 static void __init conmode_default(void) 244 { 245 char query_buffer[1024]; 246 char *ptr; 247 248 if (MACHINE_IS_VM) { 249 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 250 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 251 ptr = strstr(query_buffer, "SUBCHANNEL ="); 252 console_irq = simple_strtoul(ptr + 13, NULL, 16); 253 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 254 ptr = strstr(query_buffer, "CONMODE"); 255 /* 256 * Set the conmode to 3215 so that the device recognition 257 * will set the cu_type of the console to 3215. If the 258 * conmode is 3270 and we don't set it back then both 259 * 3215 and the 3270 driver will try to access the console 260 * device (3215 as console and 3270 as normal tty). 261 */ 262 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 263 if (ptr == NULL) { 264 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 265 SET_CONSOLE_SCLP; 266 #endif 267 return; 268 } 269 if (str_has_prefix(ptr + 8, "3270")) { 270 #if defined(CONFIG_TN3270_CONSOLE) 271 SET_CONSOLE_3270; 272 #elif defined(CONFIG_TN3215_CONSOLE) 273 SET_CONSOLE_3215; 274 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 275 SET_CONSOLE_SCLP; 276 #endif 277 } else if (str_has_prefix(ptr + 8, "3215")) { 278 #if defined(CONFIG_TN3215_CONSOLE) 279 SET_CONSOLE_3215; 280 #elif defined(CONFIG_TN3270_CONSOLE) 281 SET_CONSOLE_3270; 282 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 283 SET_CONSOLE_SCLP; 284 #endif 285 } 286 } else if (MACHINE_IS_KVM) { 287 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 288 SET_CONSOLE_VT220; 289 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 290 SET_CONSOLE_SCLP; 291 else 292 SET_CONSOLE_HVC; 293 } else { 294 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 295 SET_CONSOLE_SCLP; 296 #endif 297 } 298 } 299 300 #ifdef CONFIG_CRASH_DUMP 301 static void __init setup_zfcpdump(void) 302 { 303 if (!is_ipl_type_dump()) 304 return; 305 if (oldmem_data.start) 306 return; 307 strlcat(boot_command_line, " cio_ignore=all,!ipldev,!condev", COMMAND_LINE_SIZE); 308 console_loglevel = 2; 309 } 310 #else 311 static inline void setup_zfcpdump(void) {} 312 #endif /* CONFIG_CRASH_DUMP */ 313 314 /* 315 * Reboot, halt and power_off stubs. They just call _machine_restart, 316 * _machine_halt or _machine_power_off. 317 */ 318 319 void machine_restart(char *command) 320 { 321 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 322 /* 323 * Only unblank the console if we are called in enabled 324 * context or a bust_spinlocks cleared the way for us. 325 */ 326 console_unblank(); 327 _machine_restart(command); 328 } 329 330 void machine_halt(void) 331 { 332 if (!in_interrupt() || oops_in_progress) 333 /* 334 * Only unblank the console if we are called in enabled 335 * context or a bust_spinlocks cleared the way for us. 336 */ 337 console_unblank(); 338 _machine_halt(); 339 } 340 341 void machine_power_off(void) 342 { 343 if (!in_interrupt() || oops_in_progress) 344 /* 345 * Only unblank the console if we are called in enabled 346 * context or a bust_spinlocks cleared the way for us. 347 */ 348 console_unblank(); 349 _machine_power_off(); 350 } 351 352 /* 353 * Dummy power off function. 354 */ 355 void (*pm_power_off)(void) = machine_power_off; 356 EXPORT_SYMBOL_GPL(pm_power_off); 357 358 void *restart_stack; 359 360 unsigned long stack_alloc(void) 361 { 362 #ifdef CONFIG_VMAP_STACK 363 void *ret; 364 365 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP, 366 NUMA_NO_NODE, __builtin_return_address(0)); 367 kmemleak_not_leak(ret); 368 return (unsigned long)ret; 369 #else 370 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 371 #endif 372 } 373 374 void stack_free(unsigned long stack) 375 { 376 #ifdef CONFIG_VMAP_STACK 377 vfree((void *) stack); 378 #else 379 free_pages(stack, THREAD_SIZE_ORDER); 380 #endif 381 } 382 383 static unsigned long __init stack_alloc_early(void) 384 { 385 unsigned long stack; 386 387 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE); 388 if (!stack) { 389 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 390 __func__, THREAD_SIZE, THREAD_SIZE); 391 } 392 return stack; 393 } 394 395 static void __init setup_lowcore(void) 396 { 397 struct lowcore *lc, *abs_lc; 398 399 /* 400 * Setup lowcore for boot cpu 401 */ 402 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 403 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 404 if (!lc) 405 panic("%s: Failed to allocate %zu bytes align=%zx\n", 406 __func__, sizeof(*lc), sizeof(*lc)); 407 408 lc->pcpu = (unsigned long)per_cpu_ptr(&pcpu_devices, 0); 409 lc->restart_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT; 410 lc->restart_psw.addr = __pa(restart_int_handler); 411 lc->external_new_psw.mask = PSW_KERNEL_BITS; 412 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 413 lc->svc_new_psw.mask = PSW_KERNEL_BITS; 414 lc->svc_new_psw.addr = (unsigned long) system_call; 415 lc->program_new_psw.mask = PSW_KERNEL_BITS; 416 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 417 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 418 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 419 lc->io_new_psw.mask = PSW_KERNEL_BITS; 420 lc->io_new_psw.addr = (unsigned long) io_int_handler; 421 lc->clock_comparator = clock_comparator_max; 422 lc->current_task = (unsigned long)&init_task; 423 lc->lpp = LPP_MAGIC; 424 lc->machine_flags = get_lowcore()->machine_flags; 425 lc->preempt_count = get_lowcore()->preempt_count; 426 nmi_alloc_mcesa_early(&lc->mcesad); 427 lc->sys_enter_timer = get_lowcore()->sys_enter_timer; 428 lc->exit_timer = get_lowcore()->exit_timer; 429 lc->user_timer = get_lowcore()->user_timer; 430 lc->system_timer = get_lowcore()->system_timer; 431 lc->steal_timer = get_lowcore()->steal_timer; 432 lc->last_update_timer = get_lowcore()->last_update_timer; 433 lc->last_update_clock = get_lowcore()->last_update_clock; 434 /* 435 * Allocate the global restart stack which is the same for 436 * all CPUs in case *one* of them does a PSW restart. 437 */ 438 restart_stack = (void *)(stack_alloc_early() + STACK_INIT_OFFSET); 439 lc->mcck_stack = stack_alloc_early() + STACK_INIT_OFFSET; 440 lc->async_stack = stack_alloc_early() + STACK_INIT_OFFSET; 441 lc->nodat_stack = stack_alloc_early() + STACK_INIT_OFFSET; 442 lc->kernel_stack = get_lowcore()->kernel_stack; 443 /* 444 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 445 * restart data to the absolute zero lowcore. This is necessary if 446 * PSW restart is done on an offline CPU that has lowcore zero. 447 */ 448 lc->restart_stack = (unsigned long) restart_stack; 449 lc->restart_fn = (unsigned long) do_restart; 450 lc->restart_data = 0; 451 lc->restart_source = -1U; 452 lc->spinlock_lockval = arch_spin_lockval(0); 453 lc->spinlock_index = 0; 454 arch_spin_lock_setup(0); 455 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); 456 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); 457 lc->preempt_count = PREEMPT_DISABLED; 458 lc->kernel_asce = get_lowcore()->kernel_asce; 459 lc->user_asce = get_lowcore()->user_asce; 460 461 system_ctlreg_init_save_area(lc); 462 abs_lc = get_abs_lowcore(); 463 abs_lc->restart_stack = lc->restart_stack; 464 abs_lc->restart_fn = lc->restart_fn; 465 abs_lc->restart_data = lc->restart_data; 466 abs_lc->restart_source = lc->restart_source; 467 abs_lc->restart_psw = lc->restart_psw; 468 abs_lc->restart_flags = RESTART_FLAG_CTLREGS; 469 abs_lc->program_new_psw = lc->program_new_psw; 470 abs_lc->mcesad = lc->mcesad; 471 put_abs_lowcore(abs_lc); 472 473 set_prefix(__pa(lc)); 474 lowcore_ptr[0] = lc; 475 if (abs_lowcore_map(0, lowcore_ptr[0], false)) 476 panic("Couldn't setup absolute lowcore"); 477 } 478 479 static struct resource code_resource = { 480 .name = "Kernel code", 481 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 482 }; 483 484 static struct resource data_resource = { 485 .name = "Kernel data", 486 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 487 }; 488 489 static struct resource bss_resource = { 490 .name = "Kernel bss", 491 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 492 }; 493 494 static struct resource __initdata *standard_resources[] = { 495 &code_resource, 496 &data_resource, 497 &bss_resource, 498 }; 499 500 static void __init setup_resources(void) 501 { 502 struct resource *res, *std_res, *sub_res; 503 phys_addr_t start, end; 504 int j; 505 u64 i; 506 507 code_resource.start = __pa_symbol(_text); 508 code_resource.end = __pa_symbol(_etext) - 1; 509 data_resource.start = __pa_symbol(_etext); 510 data_resource.end = __pa_symbol(_edata) - 1; 511 bss_resource.start = __pa_symbol(__bss_start); 512 bss_resource.end = __pa_symbol(__bss_stop) - 1; 513 514 for_each_mem_range(i, &start, &end) { 515 res = memblock_alloc(sizeof(*res), 8); 516 if (!res) 517 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 518 __func__, sizeof(*res), 8); 519 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 520 521 res->name = "System RAM"; 522 res->start = start; 523 /* 524 * In memblock, end points to the first byte after the 525 * range while in resources, end points to the last byte in 526 * the range. 527 */ 528 res->end = end - 1; 529 request_resource(&iomem_resource, res); 530 531 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 532 std_res = standard_resources[j]; 533 if (std_res->start < res->start || 534 std_res->start > res->end) 535 continue; 536 if (std_res->end > res->end) { 537 sub_res = memblock_alloc(sizeof(*sub_res), 8); 538 if (!sub_res) 539 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 540 __func__, sizeof(*sub_res), 8); 541 *sub_res = *std_res; 542 sub_res->end = res->end; 543 std_res->start = res->end + 1; 544 request_resource(res, sub_res); 545 } else { 546 request_resource(res, std_res); 547 } 548 } 549 } 550 #ifdef CONFIG_CRASH_DUMP 551 /* 552 * Re-add removed crash kernel memory as reserved memory. This makes 553 * sure it will be mapped with the identity mapping and struct pages 554 * will be created, so it can be resized later on. 555 * However add it later since the crash kernel resource should not be 556 * part of the System RAM resource. 557 */ 558 if (crashk_res.end) { 559 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 560 0, MEMBLOCK_NONE); 561 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 562 insert_resource(&iomem_resource, &crashk_res); 563 } 564 #endif 565 } 566 567 static void __init setup_memory_end(void) 568 { 569 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size); 570 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20); 571 } 572 573 #ifdef CONFIG_CRASH_DUMP 574 575 /* 576 * When kdump is enabled, we have to ensure that no memory from the area 577 * [0 - crashkernel memory size] is set offline - it will be exchanged with 578 * the crashkernel memory region when kdump is triggered. The crashkernel 579 * memory region can never get offlined (pages are unmovable). 580 */ 581 static int kdump_mem_notifier(struct notifier_block *nb, 582 unsigned long action, void *data) 583 { 584 struct memory_notify *arg = data; 585 586 if (action != MEM_GOING_OFFLINE) 587 return NOTIFY_OK; 588 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 589 return NOTIFY_BAD; 590 return NOTIFY_OK; 591 } 592 593 static struct notifier_block kdump_mem_nb = { 594 .notifier_call = kdump_mem_notifier, 595 }; 596 597 #endif 598 599 /* 600 * Reserve page tables created by decompressor 601 */ 602 static void __init reserve_pgtables(void) 603 { 604 unsigned long start, end; 605 struct reserved_range *range; 606 607 for_each_physmem_reserved_type_range(RR_VMEM, range, &start, &end) 608 memblock_reserve(start, end - start); 609 } 610 611 /* 612 * Reserve memory for kdump kernel to be loaded with kexec 613 */ 614 static void __init reserve_crashkernel(void) 615 { 616 #ifdef CONFIG_CRASH_DUMP 617 unsigned long long crash_base, crash_size; 618 phys_addr_t low, high; 619 int rc; 620 621 rc = parse_crashkernel(boot_command_line, ident_map_size, 622 &crash_size, &crash_base, NULL, NULL); 623 624 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 625 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 626 if (rc || crash_size == 0) 627 return; 628 629 if (memblock.memory.regions[0].size < crash_size) { 630 pr_info("crashkernel reservation failed: %s\n", 631 "first memory chunk must be at least crashkernel size"); 632 return; 633 } 634 635 low = crash_base ?: oldmem_data.start; 636 high = low + crash_size; 637 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) { 638 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 639 crash_base = low; 640 } else { 641 /* Find suitable area in free memory */ 642 low = max_t(unsigned long, crash_size, sclp.hsa_size); 643 high = crash_base ? crash_base + crash_size : ULONG_MAX; 644 645 if (crash_base && crash_base < low) { 646 pr_info("crashkernel reservation failed: %s\n", 647 "crash_base too low"); 648 return; 649 } 650 low = crash_base ?: low; 651 crash_base = memblock_phys_alloc_range(crash_size, 652 KEXEC_CRASH_MEM_ALIGN, 653 low, high); 654 } 655 656 if (!crash_base) { 657 pr_info("crashkernel reservation failed: %s\n", 658 "no suitable area found"); 659 return; 660 } 661 662 if (register_memory_notifier(&kdump_mem_nb)) { 663 memblock_phys_free(crash_base, crash_size); 664 return; 665 } 666 667 if (!oldmem_data.start && MACHINE_IS_VM) 668 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 669 crashk_res.start = crash_base; 670 crashk_res.end = crash_base + crash_size - 1; 671 memblock_remove(crash_base, crash_size); 672 pr_info("Reserving %lluMB of memory at %lluMB " 673 "for crashkernel (System RAM: %luMB)\n", 674 crash_size >> 20, crash_base >> 20, 675 (unsigned long)memblock.memory.total_size >> 20); 676 os_info_crashkernel_add(crash_base, crash_size); 677 #endif 678 } 679 680 /* 681 * Reserve the initrd from being used by memblock 682 */ 683 static void __init reserve_initrd(void) 684 { 685 unsigned long addr, size; 686 687 if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || !get_physmem_reserved(RR_INITRD, &addr, &size)) 688 return; 689 initrd_start = (unsigned long)__va(addr); 690 initrd_end = initrd_start + size; 691 memblock_reserve(addr, size); 692 } 693 694 /* 695 * Reserve the memory area used to pass the certificate lists 696 */ 697 static void __init reserve_certificate_list(void) 698 { 699 if (ipl_cert_list_addr) 700 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 701 } 702 703 static void __init reserve_physmem_info(void) 704 { 705 unsigned long addr, size; 706 707 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size)) 708 memblock_reserve(addr, size); 709 } 710 711 static void __init free_physmem_info(void) 712 { 713 unsigned long addr, size; 714 715 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size)) 716 memblock_phys_free(addr, size); 717 } 718 719 static void __init memblock_add_physmem_info(void) 720 { 721 unsigned long start, end; 722 int i; 723 724 pr_debug("physmem info source: %s (%hhd)\n", 725 get_physmem_info_source(), physmem_info.info_source); 726 /* keep memblock lists close to the kernel */ 727 memblock_set_bottom_up(true); 728 for_each_physmem_usable_range(i, &start, &end) 729 memblock_add(start, end - start); 730 for_each_physmem_online_range(i, &start, &end) 731 memblock_physmem_add(start, end - start); 732 memblock_set_bottom_up(false); 733 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0); 734 } 735 736 /* 737 * Reserve memory used for lowcore. 738 */ 739 static void __init reserve_lowcore(void) 740 { 741 void *lowcore_start = get_lowcore(); 742 void *lowcore_end = lowcore_start + sizeof(struct lowcore); 743 void *start, *end; 744 745 if ((void *)__identity_base < lowcore_end) { 746 start = max(lowcore_start, (void *)__identity_base); 747 end = min(lowcore_end, (void *)(__identity_base + ident_map_size)); 748 memblock_reserve(__pa(start), __pa(end)); 749 } 750 } 751 752 /* 753 * Reserve memory used for absolute lowcore/command line/kernel image. 754 */ 755 static void __init reserve_kernel(void) 756 { 757 memblock_reserve(0, STARTUP_NORMAL_OFFSET); 758 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long)); 759 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long)); 760 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31); 761 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP); 762 memblock_reserve(__pa(_stext), _end - _stext); 763 } 764 765 static void __init setup_memory(void) 766 { 767 phys_addr_t start, end; 768 u64 i; 769 770 /* 771 * Init storage key for present memory 772 */ 773 for_each_mem_range(i, &start, &end) 774 storage_key_init_range(start, end); 775 776 psw_set_key(PAGE_DEFAULT_KEY); 777 } 778 779 static void __init relocate_amode31_section(void) 780 { 781 unsigned long amode31_size = __eamode31 - __samode31; 782 long amode31_offset, *ptr; 783 784 amode31_offset = AMODE31_START - (unsigned long)__samode31; 785 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size); 786 787 /* Move original AMODE31 section to the new one */ 788 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size); 789 /* Zero out the old AMODE31 section to catch invalid accesses within it */ 790 memset(__samode31, 0, amode31_size); 791 792 /* Update all AMODE31 region references */ 793 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++) 794 *ptr += amode31_offset; 795 } 796 797 /* This must be called after AMODE31 relocation */ 798 static void __init setup_cr(void) 799 { 800 union ctlreg2 cr2; 801 union ctlreg5 cr5; 802 union ctlreg15 cr15; 803 804 __ctl_duct[1] = (unsigned long)__ctl_aste; 805 __ctl_duct[2] = (unsigned long)__ctl_aste; 806 __ctl_duct[4] = (unsigned long)__ctl_duald; 807 808 /* Update control registers CR2, CR5 and CR15 */ 809 local_ctl_store(2, &cr2.reg); 810 local_ctl_store(5, &cr5.reg); 811 local_ctl_store(15, &cr15.reg); 812 cr2.ducto = (unsigned long)__ctl_duct >> 6; 813 cr5.pasteo = (unsigned long)__ctl_duct >> 6; 814 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3; 815 system_ctl_load(2, &cr2.reg); 816 system_ctl_load(5, &cr5.reg); 817 system_ctl_load(15, &cr15.reg); 818 } 819 820 /* 821 * Add system information as device randomness 822 */ 823 static void __init setup_randomness(void) 824 { 825 struct sysinfo_3_2_2 *vmms; 826 827 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 828 if (!vmms) 829 panic("Failed to allocate memory for sysinfo structure\n"); 830 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 831 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 832 memblock_free(vmms, PAGE_SIZE); 833 834 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG)) 835 static_branch_enable(&s390_arch_random_available); 836 } 837 838 /* 839 * Issue diagnose 318 to set the control program name and 840 * version codes. 841 */ 842 static void __init setup_control_program_code(void) 843 { 844 union diag318_info diag318_info = { 845 .cpnc = CPNC_LINUX, 846 .cpvc = 0, 847 }; 848 849 if (!sclp.has_diag318) 850 return; 851 852 diag_stat_inc(DIAG_STAT_X318); 853 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 854 } 855 856 /* 857 * Print the component list from the IPL report 858 */ 859 static void __init log_component_list(void) 860 { 861 struct ipl_rb_component_entry *ptr, *end; 862 char *str; 863 864 if (!early_ipl_comp_list_addr) 865 return; 866 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) 867 pr_info("Linux is running with Secure-IPL enabled\n"); 868 else 869 pr_info("Linux is running with Secure-IPL disabled\n"); 870 ptr = __va(early_ipl_comp_list_addr); 871 end = (void *) ptr + early_ipl_comp_list_size; 872 pr_info("The IPL report contains the following components:\n"); 873 while (ptr < end) { 874 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 875 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 876 str = "signed, verified"; 877 else 878 str = "signed, verification failed"; 879 } else { 880 str = "not signed"; 881 } 882 pr_info("%016llx - %016llx (%s)\n", 883 ptr->addr, ptr->addr + ptr->len, str); 884 ptr++; 885 } 886 } 887 888 /* 889 * Setup function called from init/main.c just after the banner 890 * was printed. 891 */ 892 893 void __init setup_arch(char **cmdline_p) 894 { 895 /* 896 * print what head.S has found out about the machine 897 */ 898 if (MACHINE_IS_VM) 899 pr_info("Linux is running as a z/VM " 900 "guest operating system in 64-bit mode\n"); 901 else if (MACHINE_IS_KVM) 902 pr_info("Linux is running under KVM in 64-bit mode\n"); 903 else if (MACHINE_IS_LPAR) 904 pr_info("Linux is running natively in 64-bit mode\n"); 905 else 906 pr_info("Linux is running as a guest in 64-bit mode\n"); 907 908 if (have_relocated_lowcore()) 909 pr_info("Lowcore relocated to 0x%px\n", get_lowcore()); 910 911 log_component_list(); 912 913 /* Have one command line that is parsed and saved in /proc/cmdline */ 914 /* boot_command_line has been already set up in early.c */ 915 *cmdline_p = boot_command_line; 916 917 ROOT_DEV = Root_RAM0; 918 919 setup_initial_init_mm(_text, _etext, _edata, _end); 920 921 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 922 nospec_auto_detect(); 923 924 jump_label_init(); 925 parse_early_param(); 926 #ifdef CONFIG_CRASH_DUMP 927 /* Deactivate elfcorehdr= kernel parameter */ 928 elfcorehdr_addr = ELFCORE_ADDR_MAX; 929 #endif 930 931 os_info_init(); 932 setup_ipl(); 933 setup_control_program_code(); 934 935 /* Do some memory reservations *before* memory is added to memblock */ 936 reserve_pgtables(); 937 reserve_lowcore(); 938 reserve_kernel(); 939 reserve_initrd(); 940 reserve_certificate_list(); 941 reserve_physmem_info(); 942 memblock_set_current_limit(ident_map_size); 943 memblock_allow_resize(); 944 945 /* Get information about *all* installed memory */ 946 memblock_add_physmem_info(); 947 948 free_physmem_info(); 949 setup_memory_end(); 950 memblock_dump_all(); 951 setup_memory(); 952 953 relocate_amode31_section(); 954 setup_cr(); 955 setup_uv(); 956 dma_contiguous_reserve(ident_map_size); 957 vmcp_cma_reserve(); 958 if (MACHINE_HAS_EDAT2) 959 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 960 961 reserve_crashkernel(); 962 #ifdef CONFIG_CRASH_DUMP 963 /* 964 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset. 965 * Therefore CPU and device initialization should be done afterwards. 966 */ 967 smp_save_dump_secondary_cpus(); 968 #endif 969 970 setup_resources(); 971 setup_lowcore(); 972 smp_fill_possible_mask(); 973 cpu_detect_mhz_feature(); 974 cpu_init(); 975 numa_setup(); 976 smp_detect_cpus(); 977 topology_init_early(); 978 979 if (test_facility(193)) 980 static_branch_enable(&cpu_has_bear); 981 982 /* 983 * Create kernel page tables. 984 */ 985 paging_init(); 986 987 /* 988 * After paging_init created the kernel page table, the new PSWs 989 * in lowcore can now run with DAT enabled. 990 */ 991 #ifdef CONFIG_CRASH_DUMP 992 smp_save_dump_ipl_cpu(); 993 #endif 994 995 /* Setup default console */ 996 conmode_default(); 997 set_preferred_console(); 998 999 apply_alternative_instructions(); 1000 if (IS_ENABLED(CONFIG_EXPOLINE)) 1001 nospec_init_branches(); 1002 1003 /* Setup zfcp/nvme dump support */ 1004 setup_zfcpdump(); 1005 1006 /* Add system specific data to the random pool */ 1007 setup_randomness(); 1008 } 1009