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/mem_detect.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 unsigned long __amode31_ref __samode31 = (unsigned long)&_samode31; 101 unsigned long __amode31_ref __eamode31 = (unsigned long)&_eamode31; 102 unsigned long __amode31_ref __stext_amode31 = (unsigned long)&_stext_amode31; 103 unsigned long __amode31_ref __etext_amode31 = (unsigned long)&_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 int __bootdata(noexec_disabled); 149 unsigned long __bootdata(ident_map_size); 150 struct mem_detect_info __bootdata(mem_detect); 151 struct initrd_data __bootdata(initrd_data); 152 153 unsigned long __bootdata_preserved(__kaslr_offset); 154 unsigned long __bootdata(__amode31_base); 155 unsigned int __bootdata_preserved(zlib_dfltcc_support); 156 EXPORT_SYMBOL(zlib_dfltcc_support); 157 u64 __bootdata_preserved(stfle_fac_list[16]); 158 EXPORT_SYMBOL(stfle_fac_list); 159 u64 __bootdata_preserved(alt_stfle_fac_list[16]); 160 struct oldmem_data __bootdata_preserved(oldmem_data); 161 162 unsigned long VMALLOC_START; 163 EXPORT_SYMBOL(VMALLOC_START); 164 165 unsigned long VMALLOC_END; 166 EXPORT_SYMBOL(VMALLOC_END); 167 168 struct page *vmemmap; 169 EXPORT_SYMBOL(vmemmap); 170 unsigned long vmemmap_size; 171 172 unsigned long MODULES_VADDR; 173 unsigned long MODULES_END; 174 175 /* An array with a pointer to the lowcore of every CPU. */ 176 struct lowcore *lowcore_ptr[NR_CPUS]; 177 EXPORT_SYMBOL(lowcore_ptr); 178 179 DEFINE_STATIC_KEY_FALSE(cpu_has_bear); 180 181 /* 182 * The Write Back bit position in the physaddr is given by the SLPC PCI. 183 * Leaving the mask zero always uses write through which is safe 184 */ 185 unsigned long mio_wb_bit_mask __ro_after_init; 186 187 /* 188 * This is set up by the setup-routine at boot-time 189 * for S390 need to find out, what we have to setup 190 * using address 0x10400 ... 191 */ 192 193 #include <asm/setup.h> 194 195 /* 196 * condev= and conmode= setup parameter. 197 */ 198 199 static int __init condev_setup(char *str) 200 { 201 int vdev; 202 203 vdev = simple_strtoul(str, &str, 0); 204 if (vdev >= 0 && vdev < 65536) { 205 console_devno = vdev; 206 console_irq = -1; 207 } 208 return 1; 209 } 210 211 __setup("condev=", condev_setup); 212 213 static void __init set_preferred_console(void) 214 { 215 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 216 add_preferred_console("ttyS", 0, NULL); 217 else if (CONSOLE_IS_3270) 218 add_preferred_console("tty3270", 0, NULL); 219 else if (CONSOLE_IS_VT220) 220 add_preferred_console("ttysclp", 0, NULL); 221 else if (CONSOLE_IS_HVC) 222 add_preferred_console("hvc", 0, NULL); 223 } 224 225 static int __init conmode_setup(char *str) 226 { 227 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 228 if (!strcmp(str, "hwc") || !strcmp(str, "sclp")) 229 SET_CONSOLE_SCLP; 230 #endif 231 #if defined(CONFIG_TN3215_CONSOLE) 232 if (!strcmp(str, "3215")) 233 SET_CONSOLE_3215; 234 #endif 235 #if defined(CONFIG_TN3270_CONSOLE) 236 if (!strcmp(str, "3270")) 237 SET_CONSOLE_3270; 238 #endif 239 set_preferred_console(); 240 return 1; 241 } 242 243 __setup("conmode=", conmode_setup); 244 245 static void __init conmode_default(void) 246 { 247 char query_buffer[1024]; 248 char *ptr; 249 250 if (MACHINE_IS_VM) { 251 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 252 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 253 ptr = strstr(query_buffer, "SUBCHANNEL ="); 254 console_irq = simple_strtoul(ptr + 13, NULL, 16); 255 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 256 ptr = strstr(query_buffer, "CONMODE"); 257 /* 258 * Set the conmode to 3215 so that the device recognition 259 * will set the cu_type of the console to 3215. If the 260 * conmode is 3270 and we don't set it back then both 261 * 3215 and the 3270 driver will try to access the console 262 * device (3215 as console and 3270 as normal tty). 263 */ 264 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 265 if (ptr == NULL) { 266 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 267 SET_CONSOLE_SCLP; 268 #endif 269 return; 270 } 271 if (str_has_prefix(ptr + 8, "3270")) { 272 #if defined(CONFIG_TN3270_CONSOLE) 273 SET_CONSOLE_3270; 274 #elif defined(CONFIG_TN3215_CONSOLE) 275 SET_CONSOLE_3215; 276 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 277 SET_CONSOLE_SCLP; 278 #endif 279 } else if (str_has_prefix(ptr + 8, "3215")) { 280 #if defined(CONFIG_TN3215_CONSOLE) 281 SET_CONSOLE_3215; 282 #elif defined(CONFIG_TN3270_CONSOLE) 283 SET_CONSOLE_3270; 284 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 285 SET_CONSOLE_SCLP; 286 #endif 287 } 288 } else if (MACHINE_IS_KVM) { 289 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 290 SET_CONSOLE_VT220; 291 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 292 SET_CONSOLE_SCLP; 293 else 294 SET_CONSOLE_HVC; 295 } else { 296 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 297 SET_CONSOLE_SCLP; 298 #endif 299 } 300 } 301 302 #ifdef CONFIG_CRASH_DUMP 303 static void __init setup_zfcpdump(void) 304 { 305 if (!is_ipl_type_dump()) 306 return; 307 if (oldmem_data.start) 308 return; 309 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 310 console_loglevel = 2; 311 } 312 #else 313 static inline void setup_zfcpdump(void) {} 314 #endif /* CONFIG_CRASH_DUMP */ 315 316 /* 317 * Reboot, halt and power_off stubs. They just call _machine_restart, 318 * _machine_halt or _machine_power_off. 319 */ 320 321 void machine_restart(char *command) 322 { 323 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 324 /* 325 * Only unblank the console if we are called in enabled 326 * context or a bust_spinlocks cleared the way for us. 327 */ 328 console_unblank(); 329 _machine_restart(command); 330 } 331 332 void machine_halt(void) 333 { 334 if (!in_interrupt() || oops_in_progress) 335 /* 336 * Only unblank the console if we are called in enabled 337 * context or a bust_spinlocks cleared the way for us. 338 */ 339 console_unblank(); 340 _machine_halt(); 341 } 342 343 void machine_power_off(void) 344 { 345 if (!in_interrupt() || oops_in_progress) 346 /* 347 * Only unblank the console if we are called in enabled 348 * context or a bust_spinlocks cleared the way for us. 349 */ 350 console_unblank(); 351 _machine_power_off(); 352 } 353 354 /* 355 * Dummy power off function. 356 */ 357 void (*pm_power_off)(void) = machine_power_off; 358 EXPORT_SYMBOL_GPL(pm_power_off); 359 360 void *restart_stack; 361 362 unsigned long stack_alloc(void) 363 { 364 #ifdef CONFIG_VMAP_STACK 365 void *ret; 366 367 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP, 368 NUMA_NO_NODE, __builtin_return_address(0)); 369 kmemleak_not_leak(ret); 370 return (unsigned long)ret; 371 #else 372 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 373 #endif 374 } 375 376 void stack_free(unsigned long stack) 377 { 378 #ifdef CONFIG_VMAP_STACK 379 vfree((void *) stack); 380 #else 381 free_pages(stack, THREAD_SIZE_ORDER); 382 #endif 383 } 384 385 int __init arch_early_irq_init(void) 386 { 387 unsigned long stack; 388 389 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 390 if (!stack) 391 panic("Couldn't allocate async stack"); 392 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET; 393 return 0; 394 } 395 396 void __init arch_call_rest_init(void) 397 { 398 unsigned long stack; 399 400 smp_reinit_ipl_cpu(); 401 stack = stack_alloc(); 402 if (!stack) 403 panic("Couldn't allocate kernel stack"); 404 current->stack = (void *) stack; 405 #ifdef CONFIG_VMAP_STACK 406 current->stack_vm_area = (void *) stack; 407 #endif 408 set_task_stack_end_magic(current); 409 stack += STACK_INIT_OFFSET; 410 S390_lowcore.kernel_stack = stack; 411 call_on_stack_noreturn(rest_init, stack); 412 } 413 414 static void __init setup_lowcore_dat_off(void) 415 { 416 unsigned long int_psw_mask = PSW_KERNEL_BITS; 417 struct lowcore *abs_lc, *lc; 418 unsigned long mcck_stack; 419 unsigned long flags; 420 421 if (IS_ENABLED(CONFIG_KASAN)) 422 int_psw_mask |= PSW_MASK_DAT; 423 424 /* 425 * Setup lowcore for boot cpu 426 */ 427 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 428 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 429 if (!lc) 430 panic("%s: Failed to allocate %zu bytes align=%zx\n", 431 __func__, sizeof(*lc), sizeof(*lc)); 432 433 lc->restart_psw.mask = PSW_KERNEL_BITS; 434 lc->restart_psw.addr = (unsigned long) restart_int_handler; 435 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 436 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 437 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 438 lc->svc_new_psw.addr = (unsigned long) system_call; 439 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 440 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 441 lc->mcck_new_psw.mask = int_psw_mask; 442 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 443 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 444 lc->io_new_psw.addr = (unsigned long) io_int_handler; 445 lc->clock_comparator = clock_comparator_max; 446 lc->nodat_stack = ((unsigned long) &init_thread_union) 447 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 448 lc->current_task = (unsigned long)&init_task; 449 lc->lpp = LPP_MAGIC; 450 lc->machine_flags = S390_lowcore.machine_flags; 451 lc->preempt_count = S390_lowcore.preempt_count; 452 nmi_alloc_mcesa_early(&lc->mcesad); 453 lc->sys_enter_timer = S390_lowcore.sys_enter_timer; 454 lc->exit_timer = S390_lowcore.exit_timer; 455 lc->user_timer = S390_lowcore.user_timer; 456 lc->system_timer = S390_lowcore.system_timer; 457 lc->steal_timer = S390_lowcore.steal_timer; 458 lc->last_update_timer = S390_lowcore.last_update_timer; 459 lc->last_update_clock = S390_lowcore.last_update_clock; 460 461 /* 462 * Allocate the global restart stack which is the same for 463 * all CPUs in cast *one* of them does a PSW restart. 464 */ 465 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE); 466 if (!restart_stack) 467 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 468 __func__, THREAD_SIZE, THREAD_SIZE); 469 restart_stack += STACK_INIT_OFFSET; 470 471 /* 472 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 473 * restart data to the absolute zero lowcore. This is necessary if 474 * PSW restart is done on an offline CPU that has lowcore zero. 475 */ 476 lc->restart_stack = (unsigned long) restart_stack; 477 lc->restart_fn = (unsigned long) do_restart; 478 lc->restart_data = 0; 479 lc->restart_source = -1U; 480 481 abs_lc = get_abs_lowcore(&flags); 482 abs_lc->restart_stack = lc->restart_stack; 483 abs_lc->restart_fn = lc->restart_fn; 484 abs_lc->restart_data = lc->restart_data; 485 abs_lc->restart_source = lc->restart_source; 486 abs_lc->restart_psw = lc->restart_psw; 487 abs_lc->mcesad = lc->mcesad; 488 put_abs_lowcore(abs_lc, flags); 489 490 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE); 491 if (!mcck_stack) 492 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 493 __func__, THREAD_SIZE, THREAD_SIZE); 494 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET; 495 496 lc->spinlock_lockval = arch_spin_lockval(0); 497 lc->spinlock_index = 0; 498 arch_spin_lock_setup(0); 499 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); 500 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); 501 lc->preempt_count = PREEMPT_DISABLED; 502 503 set_prefix(__pa(lc)); 504 lowcore_ptr[0] = lc; 505 } 506 507 static void __init setup_lowcore_dat_on(void) 508 { 509 struct lowcore *abs_lc; 510 unsigned long flags; 511 512 __ctl_clear_bit(0, 28); 513 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; 514 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; 515 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; 516 S390_lowcore.mcck_new_psw.mask |= PSW_MASK_DAT; 517 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; 518 __ctl_set_bit(0, 28); 519 __ctl_store(S390_lowcore.cregs_save_area, 0, 15); 520 if (abs_lowcore_map(0, lowcore_ptr[0], true)) 521 panic("Couldn't setup absolute lowcore"); 522 abs_lowcore_mapped = true; 523 abs_lc = get_abs_lowcore(&flags); 524 abs_lc->restart_flags = RESTART_FLAG_CTLREGS; 525 abs_lc->program_new_psw = S390_lowcore.program_new_psw; 526 memcpy(abs_lc->cregs_save_area, S390_lowcore.cregs_save_area, 527 sizeof(abs_lc->cregs_save_area)); 528 put_abs_lowcore(abs_lc, flags); 529 } 530 531 static struct resource code_resource = { 532 .name = "Kernel code", 533 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 534 }; 535 536 static struct resource data_resource = { 537 .name = "Kernel data", 538 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 539 }; 540 541 static struct resource bss_resource = { 542 .name = "Kernel bss", 543 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 544 }; 545 546 static struct resource __initdata *standard_resources[] = { 547 &code_resource, 548 &data_resource, 549 &bss_resource, 550 }; 551 552 static void __init setup_resources(void) 553 { 554 struct resource *res, *std_res, *sub_res; 555 phys_addr_t start, end; 556 int j; 557 u64 i; 558 559 code_resource.start = (unsigned long) _text; 560 code_resource.end = (unsigned long) _etext - 1; 561 data_resource.start = (unsigned long) _etext; 562 data_resource.end = (unsigned long) _edata - 1; 563 bss_resource.start = (unsigned long) __bss_start; 564 bss_resource.end = (unsigned long) __bss_stop - 1; 565 566 for_each_mem_range(i, &start, &end) { 567 res = memblock_alloc(sizeof(*res), 8); 568 if (!res) 569 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 570 __func__, sizeof(*res), 8); 571 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 572 573 res->name = "System RAM"; 574 res->start = start; 575 /* 576 * In memblock, end points to the first byte after the 577 * range while in resourses, end points to the last byte in 578 * the range. 579 */ 580 res->end = end - 1; 581 request_resource(&iomem_resource, res); 582 583 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 584 std_res = standard_resources[j]; 585 if (std_res->start < res->start || 586 std_res->start > res->end) 587 continue; 588 if (std_res->end > res->end) { 589 sub_res = memblock_alloc(sizeof(*sub_res), 8); 590 if (!sub_res) 591 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 592 __func__, sizeof(*sub_res), 8); 593 *sub_res = *std_res; 594 sub_res->end = res->end; 595 std_res->start = res->end + 1; 596 request_resource(res, sub_res); 597 } else { 598 request_resource(res, std_res); 599 } 600 } 601 } 602 #ifdef CONFIG_CRASH_DUMP 603 /* 604 * Re-add removed crash kernel memory as reserved memory. This makes 605 * sure it will be mapped with the identity mapping and struct pages 606 * will be created, so it can be resized later on. 607 * However add it later since the crash kernel resource should not be 608 * part of the System RAM resource. 609 */ 610 if (crashk_res.end) { 611 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 612 0, MEMBLOCK_NONE); 613 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 614 insert_resource(&iomem_resource, &crashk_res); 615 } 616 #endif 617 } 618 619 static void __init setup_memory_end(void) 620 { 621 memblock_remove(ident_map_size, PHYS_ADDR_MAX - ident_map_size); 622 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size); 623 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20); 624 } 625 626 #ifdef CONFIG_CRASH_DUMP 627 628 /* 629 * When kdump is enabled, we have to ensure that no memory from the area 630 * [0 - crashkernel memory size] is set offline - it will be exchanged with 631 * the crashkernel memory region when kdump is triggered. The crashkernel 632 * memory region can never get offlined (pages are unmovable). 633 */ 634 static int kdump_mem_notifier(struct notifier_block *nb, 635 unsigned long action, void *data) 636 { 637 struct memory_notify *arg = data; 638 639 if (action != MEM_GOING_OFFLINE) 640 return NOTIFY_OK; 641 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 642 return NOTIFY_BAD; 643 return NOTIFY_OK; 644 } 645 646 static struct notifier_block kdump_mem_nb = { 647 .notifier_call = kdump_mem_notifier, 648 }; 649 650 #endif 651 652 /* 653 * Reserve memory for kdump kernel to be loaded with kexec 654 */ 655 static void __init reserve_crashkernel(void) 656 { 657 #ifdef CONFIG_CRASH_DUMP 658 unsigned long long crash_base, crash_size; 659 phys_addr_t low, high; 660 int rc; 661 662 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size, 663 &crash_base); 664 665 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 666 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 667 if (rc || crash_size == 0) 668 return; 669 670 if (memblock.memory.regions[0].size < crash_size) { 671 pr_info("crashkernel reservation failed: %s\n", 672 "first memory chunk must be at least crashkernel size"); 673 return; 674 } 675 676 low = crash_base ?: oldmem_data.start; 677 high = low + crash_size; 678 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) { 679 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 680 crash_base = low; 681 } else { 682 /* Find suitable area in free memory */ 683 low = max_t(unsigned long, crash_size, sclp.hsa_size); 684 high = crash_base ? crash_base + crash_size : ULONG_MAX; 685 686 if (crash_base && crash_base < low) { 687 pr_info("crashkernel reservation failed: %s\n", 688 "crash_base too low"); 689 return; 690 } 691 low = crash_base ?: low; 692 crash_base = memblock_phys_alloc_range(crash_size, 693 KEXEC_CRASH_MEM_ALIGN, 694 low, high); 695 } 696 697 if (!crash_base) { 698 pr_info("crashkernel reservation failed: %s\n", 699 "no suitable area found"); 700 return; 701 } 702 703 if (register_memory_notifier(&kdump_mem_nb)) { 704 memblock_phys_free(crash_base, crash_size); 705 return; 706 } 707 708 if (!oldmem_data.start && MACHINE_IS_VM) 709 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 710 crashk_res.start = crash_base; 711 crashk_res.end = crash_base + crash_size - 1; 712 memblock_remove(crash_base, crash_size); 713 pr_info("Reserving %lluMB of memory at %lluMB " 714 "for crashkernel (System RAM: %luMB)\n", 715 crash_size >> 20, crash_base >> 20, 716 (unsigned long)memblock.memory.total_size >> 20); 717 os_info_crashkernel_add(crash_base, crash_size); 718 #endif 719 } 720 721 /* 722 * Reserve the initrd from being used by memblock 723 */ 724 static void __init reserve_initrd(void) 725 { 726 #ifdef CONFIG_BLK_DEV_INITRD 727 if (!initrd_data.start || !initrd_data.size) 728 return; 729 initrd_start = (unsigned long)__va(initrd_data.start); 730 initrd_end = initrd_start + initrd_data.size; 731 memblock_reserve(initrd_data.start, initrd_data.size); 732 #endif 733 } 734 735 /* 736 * Reserve the memory area used to pass the certificate lists 737 */ 738 static void __init reserve_certificate_list(void) 739 { 740 if (ipl_cert_list_addr) 741 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 742 } 743 744 static void __init reserve_mem_detect_info(void) 745 { 746 unsigned long start, size; 747 748 get_mem_detect_reserved(&start, &size); 749 if (size) 750 memblock_reserve(start, size); 751 } 752 753 static void __init free_mem_detect_info(void) 754 { 755 unsigned long start, size; 756 757 get_mem_detect_reserved(&start, &size); 758 if (size) 759 memblock_phys_free(start, size); 760 } 761 762 static const char * __init get_mem_info_source(void) 763 { 764 switch (mem_detect.info_source) { 765 case MEM_DETECT_SCLP_STOR_INFO: 766 return "sclp storage info"; 767 case MEM_DETECT_DIAG260: 768 return "diag260"; 769 case MEM_DETECT_SCLP_READ_INFO: 770 return "sclp read info"; 771 case MEM_DETECT_BIN_SEARCH: 772 return "binary search"; 773 } 774 return "none"; 775 } 776 777 static void __init memblock_add_mem_detect_info(void) 778 { 779 unsigned long start, end; 780 int i; 781 782 pr_debug("physmem info source: %s (%hhd)\n", 783 get_mem_info_source(), mem_detect.info_source); 784 /* keep memblock lists close to the kernel */ 785 memblock_set_bottom_up(true); 786 for_each_mem_detect_block(i, &start, &end) { 787 memblock_add(start, end - start); 788 memblock_physmem_add(start, end - start); 789 } 790 memblock_set_bottom_up(false); 791 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0); 792 } 793 794 /* 795 * Check for initrd being in usable memory 796 */ 797 static void __init check_initrd(void) 798 { 799 #ifdef CONFIG_BLK_DEV_INITRD 800 if (initrd_data.start && initrd_data.size && 801 !memblock_is_region_memory(initrd_data.start, initrd_data.size)) { 802 pr_err("The initial RAM disk does not fit into the memory\n"); 803 memblock_phys_free(initrd_data.start, initrd_data.size); 804 initrd_start = initrd_end = 0; 805 } 806 #endif 807 } 808 809 /* 810 * Reserve memory used for lowcore/command line/kernel image. 811 */ 812 static void __init reserve_kernel(void) 813 { 814 memblock_reserve(0, STARTUP_NORMAL_OFFSET); 815 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long)); 816 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long)); 817 memblock_reserve(__amode31_base, __eamode31 - __samode31); 818 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP); 819 memblock_reserve(__pa(_stext), _end - _stext); 820 } 821 822 static void __init setup_memory(void) 823 { 824 phys_addr_t start, end; 825 u64 i; 826 827 /* 828 * Init storage key for present memory 829 */ 830 for_each_mem_range(i, &start, &end) 831 storage_key_init_range(start, end); 832 833 psw_set_key(PAGE_DEFAULT_KEY); 834 } 835 836 static void __init relocate_amode31_section(void) 837 { 838 unsigned long amode31_size = __eamode31 - __samode31; 839 long amode31_offset = __amode31_base - __samode31; 840 long *ptr; 841 842 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size); 843 844 /* Move original AMODE31 section to the new one */ 845 memmove((void *)__amode31_base, (void *)__samode31, amode31_size); 846 /* Zero out the old AMODE31 section to catch invalid accesses within it */ 847 memset((void *)__samode31, 0, amode31_size); 848 849 /* Update all AMODE31 region references */ 850 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++) 851 *ptr += amode31_offset; 852 } 853 854 /* This must be called after AMODE31 relocation */ 855 static void __init setup_cr(void) 856 { 857 union ctlreg2 cr2; 858 union ctlreg5 cr5; 859 union ctlreg15 cr15; 860 861 __ctl_duct[1] = (unsigned long)__ctl_aste; 862 __ctl_duct[2] = (unsigned long)__ctl_aste; 863 __ctl_duct[4] = (unsigned long)__ctl_duald; 864 865 /* Update control registers CR2, CR5 and CR15 */ 866 __ctl_store(cr2.val, 2, 2); 867 __ctl_store(cr5.val, 5, 5); 868 __ctl_store(cr15.val, 15, 15); 869 cr2.ducto = (unsigned long)__ctl_duct >> 6; 870 cr5.pasteo = (unsigned long)__ctl_duct >> 6; 871 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3; 872 __ctl_load(cr2.val, 2, 2); 873 __ctl_load(cr5.val, 5, 5); 874 __ctl_load(cr15.val, 15, 15); 875 } 876 877 /* 878 * Add system information as device randomness 879 */ 880 static void __init setup_randomness(void) 881 { 882 struct sysinfo_3_2_2 *vmms; 883 884 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 885 if (!vmms) 886 panic("Failed to allocate memory for sysinfo structure\n"); 887 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 888 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 889 memblock_free(vmms, PAGE_SIZE); 890 891 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG)) 892 static_branch_enable(&s390_arch_random_available); 893 } 894 895 /* 896 * Find the correct size for the task_struct. This depends on 897 * the size of the struct fpu at the end of the thread_struct 898 * which is embedded in the task_struct. 899 */ 900 static void __init setup_task_size(void) 901 { 902 int task_size = sizeof(struct task_struct); 903 904 if (!MACHINE_HAS_VX) { 905 task_size -= sizeof(__vector128) * __NUM_VXRS; 906 task_size += sizeof(freg_t) * __NUM_FPRS; 907 } 908 arch_task_struct_size = task_size; 909 } 910 911 /* 912 * Issue diagnose 318 to set the control program name and 913 * version codes. 914 */ 915 static void __init setup_control_program_code(void) 916 { 917 union diag318_info diag318_info = { 918 .cpnc = CPNC_LINUX, 919 .cpvc = 0, 920 }; 921 922 if (!sclp.has_diag318) 923 return; 924 925 diag_stat_inc(DIAG_STAT_X318); 926 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 927 } 928 929 /* 930 * Print the component list from the IPL report 931 */ 932 static void __init log_component_list(void) 933 { 934 struct ipl_rb_component_entry *ptr, *end; 935 char *str; 936 937 if (!early_ipl_comp_list_addr) 938 return; 939 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) 940 pr_info("Linux is running with Secure-IPL enabled\n"); 941 else 942 pr_info("Linux is running with Secure-IPL disabled\n"); 943 ptr = (void *) early_ipl_comp_list_addr; 944 end = (void *) ptr + early_ipl_comp_list_size; 945 pr_info("The IPL report contains the following components:\n"); 946 while (ptr < end) { 947 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 948 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 949 str = "signed, verified"; 950 else 951 str = "signed, verification failed"; 952 } else { 953 str = "not signed"; 954 } 955 pr_info("%016llx - %016llx (%s)\n", 956 ptr->addr, ptr->addr + ptr->len, str); 957 ptr++; 958 } 959 } 960 961 /* 962 * Setup function called from init/main.c just after the banner 963 * was printed. 964 */ 965 966 void __init setup_arch(char **cmdline_p) 967 { 968 /* 969 * print what head.S has found out about the machine 970 */ 971 if (MACHINE_IS_VM) 972 pr_info("Linux is running as a z/VM " 973 "guest operating system in 64-bit mode\n"); 974 else if (MACHINE_IS_KVM) 975 pr_info("Linux is running under KVM in 64-bit mode\n"); 976 else if (MACHINE_IS_LPAR) 977 pr_info("Linux is running natively in 64-bit mode\n"); 978 else 979 pr_info("Linux is running as a guest in 64-bit mode\n"); 980 981 log_component_list(); 982 983 /* Have one command line that is parsed and saved in /proc/cmdline */ 984 /* boot_command_line has been already set up in early.c */ 985 *cmdline_p = boot_command_line; 986 987 ROOT_DEV = Root_RAM0; 988 989 setup_initial_init_mm(_text, _etext, _edata, _end); 990 991 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 992 nospec_auto_detect(); 993 994 jump_label_init(); 995 parse_early_param(); 996 #ifdef CONFIG_CRASH_DUMP 997 /* Deactivate elfcorehdr= kernel parameter */ 998 elfcorehdr_addr = ELFCORE_ADDR_MAX; 999 #endif 1000 1001 os_info_init(); 1002 setup_ipl(); 1003 setup_task_size(); 1004 setup_control_program_code(); 1005 1006 /* Do some memory reservations *before* memory is added to memblock */ 1007 reserve_kernel(); 1008 reserve_initrd(); 1009 reserve_certificate_list(); 1010 reserve_mem_detect_info(); 1011 memblock_set_current_limit(ident_map_size); 1012 memblock_allow_resize(); 1013 1014 /* Get information about *all* installed memory */ 1015 memblock_add_mem_detect_info(); 1016 1017 free_mem_detect_info(); 1018 setup_memory_end(); 1019 memblock_dump_all(); 1020 setup_memory(); 1021 1022 relocate_amode31_section(); 1023 setup_cr(); 1024 setup_uv(); 1025 dma_contiguous_reserve(ident_map_size); 1026 vmcp_cma_reserve(); 1027 if (MACHINE_HAS_EDAT2) 1028 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 1029 1030 check_initrd(); 1031 reserve_crashkernel(); 1032 #ifdef CONFIG_CRASH_DUMP 1033 /* 1034 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset. 1035 * Therefore CPU and device initialization should be done afterwards. 1036 */ 1037 smp_save_dump_secondary_cpus(); 1038 #endif 1039 1040 setup_resources(); 1041 setup_lowcore_dat_off(); 1042 smp_fill_possible_mask(); 1043 cpu_detect_mhz_feature(); 1044 cpu_init(); 1045 numa_setup(); 1046 smp_detect_cpus(); 1047 topology_init_early(); 1048 1049 if (test_facility(193)) 1050 static_branch_enable(&cpu_has_bear); 1051 1052 /* 1053 * Create kernel page tables and switch to virtual addressing. 1054 */ 1055 paging_init(); 1056 memcpy_real_init(); 1057 /* 1058 * After paging_init created the kernel page table, the new PSWs 1059 * in lowcore can now run with DAT enabled. 1060 */ 1061 setup_lowcore_dat_on(); 1062 #ifdef CONFIG_CRASH_DUMP 1063 smp_save_dump_ipl_cpu(); 1064 #endif 1065 1066 /* Setup default console */ 1067 conmode_default(); 1068 set_preferred_console(); 1069 1070 apply_alternative_instructions(); 1071 if (IS_ENABLED(CONFIG_EXPOLINE)) 1072 nospec_init_branches(); 1073 1074 /* Setup zfcp/nvme dump support */ 1075 setup_zfcpdump(); 1076 1077 /* Add system specific data to the random pool */ 1078 setup_randomness(); 1079 } 1080