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 int i; 512 513 __ctl_clear_bit(0, 28); 514 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; 515 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; 516 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; 517 S390_lowcore.mcck_new_psw.mask |= PSW_MASK_DAT; 518 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; 519 __ctl_set_bit(0, 28); 520 __ctl_store(S390_lowcore.cregs_save_area, 0, 15); 521 if (abs_lowcore_map(0, lowcore_ptr[0], true)) 522 panic("Couldn't setup absolute lowcore"); 523 abs_lowcore_mapped = true; 524 abs_lc = get_abs_lowcore(&flags); 525 abs_lc->restart_flags = RESTART_FLAG_CTLREGS; 526 abs_lc->program_new_psw = S390_lowcore.program_new_psw; 527 for (i = 0; i < 16; i++) 528 abs_lc->cregs_save_area[i] = S390_lowcore.cregs_save_area[i]; 529 put_abs_lowcore(abs_lc, flags); 530 } 531 532 static struct resource code_resource = { 533 .name = "Kernel code", 534 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 535 }; 536 537 static struct resource data_resource = { 538 .name = "Kernel data", 539 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 540 }; 541 542 static struct resource bss_resource = { 543 .name = "Kernel bss", 544 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 545 }; 546 547 static struct resource __initdata *standard_resources[] = { 548 &code_resource, 549 &data_resource, 550 &bss_resource, 551 }; 552 553 static void __init setup_resources(void) 554 { 555 struct resource *res, *std_res, *sub_res; 556 phys_addr_t start, end; 557 int j; 558 u64 i; 559 560 code_resource.start = (unsigned long) _text; 561 code_resource.end = (unsigned long) _etext - 1; 562 data_resource.start = (unsigned long) _etext; 563 data_resource.end = (unsigned long) _edata - 1; 564 bss_resource.start = (unsigned long) __bss_start; 565 bss_resource.end = (unsigned long) __bss_stop - 1; 566 567 for_each_mem_range(i, &start, &end) { 568 res = memblock_alloc(sizeof(*res), 8); 569 if (!res) 570 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 571 __func__, sizeof(*res), 8); 572 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 573 574 res->name = "System RAM"; 575 res->start = start; 576 /* 577 * In memblock, end points to the first byte after the 578 * range while in resourses, end points to the last byte in 579 * the range. 580 */ 581 res->end = end - 1; 582 request_resource(&iomem_resource, res); 583 584 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 585 std_res = standard_resources[j]; 586 if (std_res->start < res->start || 587 std_res->start > res->end) 588 continue; 589 if (std_res->end > res->end) { 590 sub_res = memblock_alloc(sizeof(*sub_res), 8); 591 if (!sub_res) 592 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 593 __func__, sizeof(*sub_res), 8); 594 *sub_res = *std_res; 595 sub_res->end = res->end; 596 std_res->start = res->end + 1; 597 request_resource(res, sub_res); 598 } else { 599 request_resource(res, std_res); 600 } 601 } 602 } 603 #ifdef CONFIG_CRASH_DUMP 604 /* 605 * Re-add removed crash kernel memory as reserved memory. This makes 606 * sure it will be mapped with the identity mapping and struct pages 607 * will be created, so it can be resized later on. 608 * However add it later since the crash kernel resource should not be 609 * part of the System RAM resource. 610 */ 611 if (crashk_res.end) { 612 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 613 0, MEMBLOCK_NONE); 614 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 615 insert_resource(&iomem_resource, &crashk_res); 616 } 617 #endif 618 } 619 620 static void __init setup_memory_end(void) 621 { 622 memblock_remove(ident_map_size, PHYS_ADDR_MAX - ident_map_size); 623 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size); 624 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20); 625 } 626 627 #ifdef CONFIG_CRASH_DUMP 628 629 /* 630 * When kdump is enabled, we have to ensure that no memory from the area 631 * [0 - crashkernel memory size] is set offline - it will be exchanged with 632 * the crashkernel memory region when kdump is triggered. The crashkernel 633 * memory region can never get offlined (pages are unmovable). 634 */ 635 static int kdump_mem_notifier(struct notifier_block *nb, 636 unsigned long action, void *data) 637 { 638 struct memory_notify *arg = data; 639 640 if (action != MEM_GOING_OFFLINE) 641 return NOTIFY_OK; 642 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 643 return NOTIFY_BAD; 644 return NOTIFY_OK; 645 } 646 647 static struct notifier_block kdump_mem_nb = { 648 .notifier_call = kdump_mem_notifier, 649 }; 650 651 #endif 652 653 /* 654 * Reserve memory for kdump kernel to be loaded with kexec 655 */ 656 static void __init reserve_crashkernel(void) 657 { 658 #ifdef CONFIG_CRASH_DUMP 659 unsigned long long crash_base, crash_size; 660 phys_addr_t low, high; 661 int rc; 662 663 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size, 664 &crash_base); 665 666 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 667 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 668 if (rc || crash_size == 0) 669 return; 670 671 if (memblock.memory.regions[0].size < crash_size) { 672 pr_info("crashkernel reservation failed: %s\n", 673 "first memory chunk must be at least crashkernel size"); 674 return; 675 } 676 677 low = crash_base ?: oldmem_data.start; 678 high = low + crash_size; 679 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) { 680 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 681 crash_base = low; 682 } else { 683 /* Find suitable area in free memory */ 684 low = max_t(unsigned long, crash_size, sclp.hsa_size); 685 high = crash_base ? crash_base + crash_size : ULONG_MAX; 686 687 if (crash_base && crash_base < low) { 688 pr_info("crashkernel reservation failed: %s\n", 689 "crash_base too low"); 690 return; 691 } 692 low = crash_base ?: low; 693 crash_base = memblock_phys_alloc_range(crash_size, 694 KEXEC_CRASH_MEM_ALIGN, 695 low, high); 696 } 697 698 if (!crash_base) { 699 pr_info("crashkernel reservation failed: %s\n", 700 "no suitable area found"); 701 return; 702 } 703 704 if (register_memory_notifier(&kdump_mem_nb)) { 705 memblock_phys_free(crash_base, crash_size); 706 return; 707 } 708 709 if (!oldmem_data.start && MACHINE_IS_VM) 710 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 711 crashk_res.start = crash_base; 712 crashk_res.end = crash_base + crash_size - 1; 713 memblock_remove(crash_base, crash_size); 714 pr_info("Reserving %lluMB of memory at %lluMB " 715 "for crashkernel (System RAM: %luMB)\n", 716 crash_size >> 20, crash_base >> 20, 717 (unsigned long)memblock.memory.total_size >> 20); 718 os_info_crashkernel_add(crash_base, crash_size); 719 #endif 720 } 721 722 /* 723 * Reserve the initrd from being used by memblock 724 */ 725 static void __init reserve_initrd(void) 726 { 727 #ifdef CONFIG_BLK_DEV_INITRD 728 if (!initrd_data.start || !initrd_data.size) 729 return; 730 initrd_start = (unsigned long)__va(initrd_data.start); 731 initrd_end = initrd_start + initrd_data.size; 732 memblock_reserve(initrd_data.start, initrd_data.size); 733 #endif 734 } 735 736 /* 737 * Reserve the memory area used to pass the certificate lists 738 */ 739 static void __init reserve_certificate_list(void) 740 { 741 if (ipl_cert_list_addr) 742 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 743 } 744 745 static void __init reserve_mem_detect_info(void) 746 { 747 unsigned long start, size; 748 749 get_mem_detect_reserved(&start, &size); 750 if (size) 751 memblock_reserve(start, size); 752 } 753 754 static void __init free_mem_detect_info(void) 755 { 756 unsigned long start, size; 757 758 get_mem_detect_reserved(&start, &size); 759 if (size) 760 memblock_phys_free(start, size); 761 } 762 763 static const char * __init get_mem_info_source(void) 764 { 765 switch (mem_detect.info_source) { 766 case MEM_DETECT_SCLP_STOR_INFO: 767 return "sclp storage info"; 768 case MEM_DETECT_DIAG260: 769 return "diag260"; 770 case MEM_DETECT_SCLP_READ_INFO: 771 return "sclp read info"; 772 case MEM_DETECT_BIN_SEARCH: 773 return "binary search"; 774 } 775 return "none"; 776 } 777 778 static void __init memblock_add_mem_detect_info(void) 779 { 780 unsigned long start, end; 781 int i; 782 783 pr_debug("physmem info source: %s (%hhd)\n", 784 get_mem_info_source(), mem_detect.info_source); 785 /* keep memblock lists close to the kernel */ 786 memblock_set_bottom_up(true); 787 for_each_mem_detect_block(i, &start, &end) { 788 memblock_add(start, end - start); 789 memblock_physmem_add(start, end - start); 790 } 791 memblock_set_bottom_up(false); 792 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0); 793 } 794 795 /* 796 * Check for initrd being in usable memory 797 */ 798 static void __init check_initrd(void) 799 { 800 #ifdef CONFIG_BLK_DEV_INITRD 801 if (initrd_data.start && initrd_data.size && 802 !memblock_is_region_memory(initrd_data.start, initrd_data.size)) { 803 pr_err("The initial RAM disk does not fit into the memory\n"); 804 memblock_phys_free(initrd_data.start, initrd_data.size); 805 initrd_start = initrd_end = 0; 806 } 807 #endif 808 } 809 810 /* 811 * Reserve memory used for lowcore/command line/kernel image. 812 */ 813 static void __init reserve_kernel(void) 814 { 815 memblock_reserve(0, STARTUP_NORMAL_OFFSET); 816 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long)); 817 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long)); 818 memblock_reserve(__amode31_base, __eamode31 - __samode31); 819 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP); 820 memblock_reserve(__pa(_stext), _end - _stext); 821 } 822 823 static void __init setup_memory(void) 824 { 825 phys_addr_t start, end; 826 u64 i; 827 828 /* 829 * Init storage key for present memory 830 */ 831 for_each_mem_range(i, &start, &end) 832 storage_key_init_range(start, end); 833 834 psw_set_key(PAGE_DEFAULT_KEY); 835 } 836 837 static void __init relocate_amode31_section(void) 838 { 839 unsigned long amode31_size = __eamode31 - __samode31; 840 long amode31_offset = __amode31_base - __samode31; 841 long *ptr; 842 843 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size); 844 845 /* Move original AMODE31 section to the new one */ 846 memmove((void *)__amode31_base, (void *)__samode31, amode31_size); 847 /* Zero out the old AMODE31 section to catch invalid accesses within it */ 848 memset((void *)__samode31, 0, amode31_size); 849 850 /* Update all AMODE31 region references */ 851 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++) 852 *ptr += amode31_offset; 853 } 854 855 /* This must be called after AMODE31 relocation */ 856 static void __init setup_cr(void) 857 { 858 union ctlreg2 cr2; 859 union ctlreg5 cr5; 860 union ctlreg15 cr15; 861 862 __ctl_duct[1] = (unsigned long)__ctl_aste; 863 __ctl_duct[2] = (unsigned long)__ctl_aste; 864 __ctl_duct[4] = (unsigned long)__ctl_duald; 865 866 /* Update control registers CR2, CR5 and CR15 */ 867 __ctl_store(cr2.val, 2, 2); 868 __ctl_store(cr5.val, 5, 5); 869 __ctl_store(cr15.val, 15, 15); 870 cr2.ducto = (unsigned long)__ctl_duct >> 6; 871 cr5.pasteo = (unsigned long)__ctl_duct >> 6; 872 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3; 873 __ctl_load(cr2.val, 2, 2); 874 __ctl_load(cr5.val, 5, 5); 875 __ctl_load(cr15.val, 15, 15); 876 } 877 878 /* 879 * Add system information as device randomness 880 */ 881 static void __init setup_randomness(void) 882 { 883 struct sysinfo_3_2_2 *vmms; 884 885 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 886 if (!vmms) 887 panic("Failed to allocate memory for sysinfo structure\n"); 888 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 889 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 890 memblock_free(vmms, PAGE_SIZE); 891 892 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG)) 893 static_branch_enable(&s390_arch_random_available); 894 } 895 896 /* 897 * Find the correct size for the task_struct. This depends on 898 * the size of the struct fpu at the end of the thread_struct 899 * which is embedded in the task_struct. 900 */ 901 static void __init setup_task_size(void) 902 { 903 int task_size = sizeof(struct task_struct); 904 905 if (!MACHINE_HAS_VX) { 906 task_size -= sizeof(__vector128) * __NUM_VXRS; 907 task_size += sizeof(freg_t) * __NUM_FPRS; 908 } 909 arch_task_struct_size = task_size; 910 } 911 912 /* 913 * Issue diagnose 318 to set the control program name and 914 * version codes. 915 */ 916 static void __init setup_control_program_code(void) 917 { 918 union diag318_info diag318_info = { 919 .cpnc = CPNC_LINUX, 920 .cpvc = 0, 921 }; 922 923 if (!sclp.has_diag318) 924 return; 925 926 diag_stat_inc(DIAG_STAT_X318); 927 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 928 } 929 930 /* 931 * Print the component list from the IPL report 932 */ 933 static void __init log_component_list(void) 934 { 935 struct ipl_rb_component_entry *ptr, *end; 936 char *str; 937 938 if (!early_ipl_comp_list_addr) 939 return; 940 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) 941 pr_info("Linux is running with Secure-IPL enabled\n"); 942 else 943 pr_info("Linux is running with Secure-IPL disabled\n"); 944 ptr = (void *) early_ipl_comp_list_addr; 945 end = (void *) ptr + early_ipl_comp_list_size; 946 pr_info("The IPL report contains the following components:\n"); 947 while (ptr < end) { 948 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 949 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 950 str = "signed, verified"; 951 else 952 str = "signed, verification failed"; 953 } else { 954 str = "not signed"; 955 } 956 pr_info("%016llx - %016llx (%s)\n", 957 ptr->addr, ptr->addr + ptr->len, str); 958 ptr++; 959 } 960 } 961 962 /* 963 * Setup function called from init/main.c just after the banner 964 * was printed. 965 */ 966 967 void __init setup_arch(char **cmdline_p) 968 { 969 /* 970 * print what head.S has found out about the machine 971 */ 972 if (MACHINE_IS_VM) 973 pr_info("Linux is running as a z/VM " 974 "guest operating system in 64-bit mode\n"); 975 else if (MACHINE_IS_KVM) 976 pr_info("Linux is running under KVM in 64-bit mode\n"); 977 else if (MACHINE_IS_LPAR) 978 pr_info("Linux is running natively in 64-bit mode\n"); 979 else 980 pr_info("Linux is running as a guest in 64-bit mode\n"); 981 982 log_component_list(); 983 984 /* Have one command line that is parsed and saved in /proc/cmdline */ 985 /* boot_command_line has been already set up in early.c */ 986 *cmdline_p = boot_command_line; 987 988 ROOT_DEV = Root_RAM0; 989 990 setup_initial_init_mm(_text, _etext, _edata, _end); 991 992 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 993 nospec_auto_detect(); 994 995 jump_label_init(); 996 parse_early_param(); 997 #ifdef CONFIG_CRASH_DUMP 998 /* Deactivate elfcorehdr= kernel parameter */ 999 elfcorehdr_addr = ELFCORE_ADDR_MAX; 1000 #endif 1001 1002 os_info_init(); 1003 setup_ipl(); 1004 setup_task_size(); 1005 setup_control_program_code(); 1006 1007 /* Do some memory reservations *before* memory is added to memblock */ 1008 reserve_kernel(); 1009 reserve_initrd(); 1010 reserve_certificate_list(); 1011 reserve_mem_detect_info(); 1012 memblock_set_current_limit(ident_map_size); 1013 memblock_allow_resize(); 1014 1015 /* Get information about *all* installed memory */ 1016 memblock_add_mem_detect_info(); 1017 1018 free_mem_detect_info(); 1019 setup_memory_end(); 1020 memblock_dump_all(); 1021 setup_memory(); 1022 1023 relocate_amode31_section(); 1024 setup_cr(); 1025 setup_uv(); 1026 dma_contiguous_reserve(ident_map_size); 1027 vmcp_cma_reserve(); 1028 if (MACHINE_HAS_EDAT2) 1029 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 1030 1031 check_initrd(); 1032 reserve_crashkernel(); 1033 #ifdef CONFIG_CRASH_DUMP 1034 /* 1035 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset. 1036 * Therefore CPU and device initialization should be done afterwards. 1037 */ 1038 smp_save_dump_secondary_cpus(); 1039 #endif 1040 1041 setup_resources(); 1042 setup_lowcore_dat_off(); 1043 smp_fill_possible_mask(); 1044 cpu_detect_mhz_feature(); 1045 cpu_init(); 1046 numa_setup(); 1047 smp_detect_cpus(); 1048 topology_init_early(); 1049 1050 if (test_facility(193)) 1051 static_branch_enable(&cpu_has_bear); 1052 1053 /* 1054 * Create kernel page tables and switch to virtual addressing. 1055 */ 1056 paging_init(); 1057 memcpy_real_init(); 1058 /* 1059 * After paging_init created the kernel page table, the new PSWs 1060 * in lowcore can now run with DAT enabled. 1061 */ 1062 setup_lowcore_dat_on(); 1063 #ifdef CONFIG_CRASH_DUMP 1064 smp_save_dump_ipl_cpu(); 1065 #endif 1066 1067 /* Setup default console */ 1068 conmode_default(); 1069 set_preferred_console(); 1070 1071 apply_alternative_instructions(); 1072 if (IS_ENABLED(CONFIG_EXPOLINE)) 1073 nospec_init_branches(); 1074 1075 /* Setup zfcp/nvme dump support */ 1076 setup_zfcpdump(); 1077 1078 /* Add system specific data to the random pool */ 1079 setup_randomness(); 1080 } 1081