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/boot_data.h> 56 #include <asm/ipl.h> 57 #include <asm/facility.h> 58 #include <asm/smp.h> 59 #include <asm/mmu_context.h> 60 #include <asm/cpcmd.h> 61 #include <asm/lowcore.h> 62 #include <asm/nmi.h> 63 #include <asm/irq.h> 64 #include <asm/page.h> 65 #include <asm/ptrace.h> 66 #include <asm/sections.h> 67 #include <asm/ebcdic.h> 68 #include <asm/diag.h> 69 #include <asm/os_info.h> 70 #include <asm/sclp.h> 71 #include <asm/stacktrace.h> 72 #include <asm/sysinfo.h> 73 #include <asm/numa.h> 74 #include <asm/alternative.h> 75 #include <asm/nospec-branch.h> 76 #include <asm/mem_detect.h> 77 #include <asm/uv.h> 78 #include <asm/asm-offsets.h> 79 #include "entry.h" 80 81 /* 82 * Machine setup.. 83 */ 84 unsigned int console_mode = 0; 85 EXPORT_SYMBOL(console_mode); 86 87 unsigned int console_devno = -1; 88 EXPORT_SYMBOL(console_devno); 89 90 unsigned int console_irq = -1; 91 EXPORT_SYMBOL(console_irq); 92 93 /* 94 * Some code and data needs to stay below 2 GB, even when the kernel would be 95 * relocated above 2 GB, because it has to use 31 bit addresses. 96 * Such code and data is part of the .amode31 section. 97 */ 98 unsigned long __amode31_ref __samode31 = (unsigned long)&_samode31; 99 unsigned long __amode31_ref __eamode31 = (unsigned long)&_eamode31; 100 unsigned long __amode31_ref __stext_amode31 = (unsigned long)&_stext_amode31; 101 unsigned long __amode31_ref __etext_amode31 = (unsigned long)&_etext_amode31; 102 struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table; 103 struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table; 104 105 /* 106 * Control registers CR2, CR5 and CR15 are initialized with addresses 107 * of tables that must be placed below 2G which is handled by the AMODE31 108 * sections. 109 * Because the AMODE31 sections are relocated below 2G at startup, 110 * the content of control registers CR2, CR5 and CR15 must be updated 111 * with new addresses after the relocation. The initial initialization of 112 * control registers occurs in head64.S and then gets updated again after AMODE31 113 * relocation. We must access the relevant AMODE31 tables indirectly via 114 * pointers placed in the .amode31.refs linker section. Those pointers get 115 * updated automatically during AMODE31 relocation and always contain a valid 116 * address within AMODE31 sections. 117 */ 118 119 static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64); 120 121 static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = { 122 [1] = 0xffffffffffffffff 123 }; 124 125 static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = { 126 0x80000000, 0, 0, 0, 127 0x80000000, 0, 0, 0, 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 }; 135 136 static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = { 137 0, 0, 0x89000000, 0, 138 0, 0, 0x8a000000, 0 139 }; 140 141 static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31; 142 static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31; 143 static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31; 144 static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31; 145 146 int __bootdata(noexec_disabled); 147 unsigned long __bootdata(ident_map_size); 148 struct mem_detect_info __bootdata(mem_detect); 149 struct initrd_data __bootdata(initrd_data); 150 151 unsigned long __bootdata_preserved(__kaslr_offset); 152 unsigned long __bootdata(__amode31_base); 153 unsigned int __bootdata_preserved(zlib_dfltcc_support); 154 EXPORT_SYMBOL(zlib_dfltcc_support); 155 u64 __bootdata_preserved(stfle_fac_list[16]); 156 EXPORT_SYMBOL(stfle_fac_list); 157 u64 __bootdata_preserved(alt_stfle_fac_list[16]); 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 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 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 int __init arch_early_irq_init(void) 384 { 385 unsigned long stack; 386 387 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 388 if (!stack) 389 panic("Couldn't allocate async stack"); 390 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET; 391 return 0; 392 } 393 394 void __init arch_call_rest_init(void) 395 { 396 unsigned long stack; 397 398 stack = stack_alloc(); 399 if (!stack) 400 panic("Couldn't allocate kernel stack"); 401 current->stack = (void *) stack; 402 #ifdef CONFIG_VMAP_STACK 403 current->stack_vm_area = (void *) stack; 404 #endif 405 set_task_stack_end_magic(current); 406 stack += STACK_INIT_OFFSET; 407 S390_lowcore.kernel_stack = stack; 408 call_on_stack_noreturn(rest_init, stack); 409 } 410 411 static void __init setup_lowcore_dat_off(void) 412 { 413 unsigned long int_psw_mask = PSW_KERNEL_BITS; 414 unsigned long mcck_stack; 415 struct lowcore *lc; 416 417 if (IS_ENABLED(CONFIG_KASAN)) 418 int_psw_mask |= PSW_MASK_DAT; 419 420 /* 421 * Setup lowcore for boot cpu 422 */ 423 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 424 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 425 if (!lc) 426 panic("%s: Failed to allocate %zu bytes align=%zx\n", 427 __func__, sizeof(*lc), sizeof(*lc)); 428 429 lc->restart_psw.mask = PSW_KERNEL_BITS; 430 lc->restart_psw.addr = (unsigned long) restart_int_handler; 431 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 432 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 433 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 434 lc->svc_new_psw.addr = (unsigned long) system_call; 435 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 436 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 437 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 438 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 439 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 440 lc->io_new_psw.addr = (unsigned long) io_int_handler; 441 lc->clock_comparator = clock_comparator_max; 442 lc->nodat_stack = ((unsigned long) &init_thread_union) 443 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 444 lc->current_task = (unsigned long)&init_task; 445 lc->lpp = LPP_MAGIC; 446 lc->machine_flags = S390_lowcore.machine_flags; 447 lc->preempt_count = S390_lowcore.preempt_count; 448 nmi_alloc_boot_cpu(lc); 449 lc->sys_enter_timer = S390_lowcore.sys_enter_timer; 450 lc->exit_timer = S390_lowcore.exit_timer; 451 lc->user_timer = S390_lowcore.user_timer; 452 lc->system_timer = S390_lowcore.system_timer; 453 lc->steal_timer = S390_lowcore.steal_timer; 454 lc->last_update_timer = S390_lowcore.last_update_timer; 455 lc->last_update_clock = S390_lowcore.last_update_clock; 456 457 /* 458 * Allocate the global restart stack which is the same for 459 * all CPUs in cast *one* of them does a PSW restart. 460 */ 461 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE); 462 if (!restart_stack) 463 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 464 __func__, THREAD_SIZE, THREAD_SIZE); 465 restart_stack += STACK_INIT_OFFSET; 466 467 /* 468 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 469 * restart data to the absolute zero lowcore. This is necessary if 470 * PSW restart is done on an offline CPU that has lowcore zero. 471 */ 472 lc->restart_stack = (unsigned long) restart_stack; 473 lc->restart_fn = (unsigned long) do_restart; 474 lc->restart_data = 0; 475 lc->restart_source = -1U; 476 477 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE); 478 if (!mcck_stack) 479 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 480 __func__, THREAD_SIZE, THREAD_SIZE); 481 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET; 482 483 /* Setup absolute zero lowcore */ 484 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 485 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 486 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 487 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 488 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 489 490 lc->spinlock_lockval = arch_spin_lockval(0); 491 lc->spinlock_index = 0; 492 arch_spin_lock_setup(0); 493 lc->br_r1_trampoline = 0x07f1; /* br %r1 */ 494 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); 495 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); 496 lc->preempt_count = PREEMPT_DISABLED; 497 498 set_prefix((u32)(unsigned long) lc); 499 lowcore_ptr[0] = lc; 500 } 501 502 static void __init setup_lowcore_dat_on(void) 503 { 504 struct lowcore *lc = lowcore_ptr[0]; 505 506 __ctl_clear_bit(0, 28); 507 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; 508 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; 509 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; 510 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; 511 __ctl_store(S390_lowcore.cregs_save_area, 0, 15); 512 __ctl_set_bit(0, 28); 513 mem_assign_absolute(S390_lowcore.restart_flags, RESTART_FLAG_CTLREGS); 514 mem_assign_absolute(S390_lowcore.program_new_psw, lc->program_new_psw); 515 memcpy_absolute(&S390_lowcore.cregs_save_area, lc->cregs_save_area, 516 sizeof(S390_lowcore.cregs_save_area)); 517 } 518 519 static struct resource code_resource = { 520 .name = "Kernel code", 521 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 522 }; 523 524 static struct resource data_resource = { 525 .name = "Kernel data", 526 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 527 }; 528 529 static struct resource bss_resource = { 530 .name = "Kernel bss", 531 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 532 }; 533 534 static struct resource __initdata *standard_resources[] = { 535 &code_resource, 536 &data_resource, 537 &bss_resource, 538 }; 539 540 static void __init setup_resources(void) 541 { 542 struct resource *res, *std_res, *sub_res; 543 phys_addr_t start, end; 544 int j; 545 u64 i; 546 547 code_resource.start = (unsigned long) _text; 548 code_resource.end = (unsigned long) _etext - 1; 549 data_resource.start = (unsigned long) _etext; 550 data_resource.end = (unsigned long) _edata - 1; 551 bss_resource.start = (unsigned long) __bss_start; 552 bss_resource.end = (unsigned long) __bss_stop - 1; 553 554 for_each_mem_range(i, &start, &end) { 555 res = memblock_alloc(sizeof(*res), 8); 556 if (!res) 557 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 558 __func__, sizeof(*res), 8); 559 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 560 561 res->name = "System RAM"; 562 res->start = start; 563 /* 564 * In memblock, end points to the first byte after the 565 * range while in resourses, end points to the last byte in 566 * the range. 567 */ 568 res->end = end - 1; 569 request_resource(&iomem_resource, res); 570 571 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 572 std_res = standard_resources[j]; 573 if (std_res->start < res->start || 574 std_res->start > res->end) 575 continue; 576 if (std_res->end > res->end) { 577 sub_res = memblock_alloc(sizeof(*sub_res), 8); 578 if (!sub_res) 579 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 580 __func__, sizeof(*sub_res), 8); 581 *sub_res = *std_res; 582 sub_res->end = res->end; 583 std_res->start = res->end + 1; 584 request_resource(res, sub_res); 585 } else { 586 request_resource(res, std_res); 587 } 588 } 589 } 590 #ifdef CONFIG_CRASH_DUMP 591 /* 592 * Re-add removed crash kernel memory as reserved memory. This makes 593 * sure it will be mapped with the identity mapping and struct pages 594 * will be created, so it can be resized later on. 595 * However add it later since the crash kernel resource should not be 596 * part of the System RAM resource. 597 */ 598 if (crashk_res.end) { 599 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 600 0, MEMBLOCK_NONE); 601 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 602 insert_resource(&iomem_resource, &crashk_res); 603 } 604 #endif 605 } 606 607 static void __init setup_memory_end(void) 608 { 609 memblock_remove(ident_map_size, ULONG_MAX); 610 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size); 611 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20); 612 } 613 614 #ifdef CONFIG_CRASH_DUMP 615 616 /* 617 * When kdump is enabled, we have to ensure that no memory from the area 618 * [0 - crashkernel memory size] is set offline - it will be exchanged with 619 * the crashkernel memory region when kdump is triggered. The crashkernel 620 * memory region can never get offlined (pages are unmovable). 621 */ 622 static int kdump_mem_notifier(struct notifier_block *nb, 623 unsigned long action, void *data) 624 { 625 struct memory_notify *arg = data; 626 627 if (action != MEM_GOING_OFFLINE) 628 return NOTIFY_OK; 629 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 630 return NOTIFY_BAD; 631 return NOTIFY_OK; 632 } 633 634 static struct notifier_block kdump_mem_nb = { 635 .notifier_call = kdump_mem_notifier, 636 }; 637 638 #endif 639 640 /* 641 * Make sure that the area above identity mapping is protected 642 */ 643 static void __init reserve_above_ident_map(void) 644 { 645 memblock_reserve(ident_map_size, ULONG_MAX); 646 } 647 648 /* 649 * Reserve memory for kdump kernel to be loaded with kexec 650 */ 651 static void __init reserve_crashkernel(void) 652 { 653 #ifdef CONFIG_CRASH_DUMP 654 unsigned long long crash_base, crash_size; 655 phys_addr_t low, high; 656 int rc; 657 658 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size, 659 &crash_base); 660 661 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 662 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 663 if (rc || crash_size == 0) 664 return; 665 666 if (memblock.memory.regions[0].size < crash_size) { 667 pr_info("crashkernel reservation failed: %s\n", 668 "first memory chunk must be at least crashkernel size"); 669 return; 670 } 671 672 low = crash_base ?: oldmem_data.start; 673 high = low + crash_size; 674 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) { 675 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 676 crash_base = low; 677 } else { 678 /* Find suitable area in free memory */ 679 low = max_t(unsigned long, crash_size, sclp.hsa_size); 680 high = crash_base ? crash_base + crash_size : ULONG_MAX; 681 682 if (crash_base && crash_base < low) { 683 pr_info("crashkernel reservation failed: %s\n", 684 "crash_base too low"); 685 return; 686 } 687 low = crash_base ?: low; 688 crash_base = memblock_phys_alloc_range(crash_size, 689 KEXEC_CRASH_MEM_ALIGN, 690 low, high); 691 } 692 693 if (!crash_base) { 694 pr_info("crashkernel reservation failed: %s\n", 695 "no suitable area found"); 696 return; 697 } 698 699 if (register_memory_notifier(&kdump_mem_nb)) { 700 memblock_phys_free(crash_base, crash_size); 701 return; 702 } 703 704 if (!oldmem_data.start && MACHINE_IS_VM) 705 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 706 crashk_res.start = crash_base; 707 crashk_res.end = crash_base + crash_size - 1; 708 memblock_remove(crash_base, crash_size); 709 pr_info("Reserving %lluMB of memory at %lluMB " 710 "for crashkernel (System RAM: %luMB)\n", 711 crash_size >> 20, crash_base >> 20, 712 (unsigned long)memblock.memory.total_size >> 20); 713 os_info_crashkernel_add(crash_base, crash_size); 714 #endif 715 } 716 717 /* 718 * Reserve the initrd from being used by memblock 719 */ 720 static void __init reserve_initrd(void) 721 { 722 #ifdef CONFIG_BLK_DEV_INITRD 723 if (!initrd_data.start || !initrd_data.size) 724 return; 725 initrd_start = (unsigned long)__va(initrd_data.start); 726 initrd_end = initrd_start + initrd_data.size; 727 memblock_reserve(initrd_data.start, initrd_data.size); 728 #endif 729 } 730 731 /* 732 * Reserve the memory area used to pass the certificate lists 733 */ 734 static void __init reserve_certificate_list(void) 735 { 736 if (ipl_cert_list_addr) 737 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 738 } 739 740 static void __init reserve_mem_detect_info(void) 741 { 742 unsigned long start, size; 743 744 get_mem_detect_reserved(&start, &size); 745 if (size) 746 memblock_reserve(start, size); 747 } 748 749 static void __init free_mem_detect_info(void) 750 { 751 unsigned long start, size; 752 753 get_mem_detect_reserved(&start, &size); 754 if (size) 755 memblock_phys_free(start, size); 756 } 757 758 static const char * __init get_mem_info_source(void) 759 { 760 switch (mem_detect.info_source) { 761 case MEM_DETECT_SCLP_STOR_INFO: 762 return "sclp storage info"; 763 case MEM_DETECT_DIAG260: 764 return "diag260"; 765 case MEM_DETECT_SCLP_READ_INFO: 766 return "sclp read info"; 767 case MEM_DETECT_BIN_SEARCH: 768 return "binary search"; 769 } 770 return "none"; 771 } 772 773 static void __init memblock_add_mem_detect_info(void) 774 { 775 unsigned long start, end; 776 int i; 777 778 pr_debug("physmem info source: %s (%hhd)\n", 779 get_mem_info_source(), mem_detect.info_source); 780 /* keep memblock lists close to the kernel */ 781 memblock_set_bottom_up(true); 782 for_each_mem_detect_block(i, &start, &end) { 783 memblock_add(start, end - start); 784 memblock_physmem_add(start, end - start); 785 } 786 memblock_set_bottom_up(false); 787 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0); 788 memblock_dump_all(); 789 } 790 791 /* 792 * Check for initrd being in usable memory 793 */ 794 static void __init check_initrd(void) 795 { 796 #ifdef CONFIG_BLK_DEV_INITRD 797 if (initrd_data.start && initrd_data.size && 798 !memblock_is_region_memory(initrd_data.start, initrd_data.size)) { 799 pr_err("The initial RAM disk does not fit into the memory\n"); 800 memblock_phys_free(initrd_data.start, initrd_data.size); 801 initrd_start = initrd_end = 0; 802 } 803 #endif 804 } 805 806 /* 807 * Reserve memory used for lowcore/command line/kernel image. 808 */ 809 static void __init reserve_kernel(void) 810 { 811 memblock_reserve(0, STARTUP_NORMAL_OFFSET); 812 memblock_reserve(__amode31_base, __eamode31 - __samode31); 813 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP); 814 memblock_reserve(__pa(_stext), _end - _stext); 815 } 816 817 static void __init setup_memory(void) 818 { 819 phys_addr_t start, end; 820 u64 i; 821 822 /* 823 * Init storage key for present memory 824 */ 825 for_each_mem_range(i, &start, &end) 826 storage_key_init_range(start, end); 827 828 psw_set_key(PAGE_DEFAULT_KEY); 829 830 /* Only cosmetics */ 831 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 832 } 833 834 static void __init relocate_amode31_section(void) 835 { 836 unsigned long amode31_size = __eamode31 - __samode31; 837 long amode31_offset = __amode31_base - __samode31; 838 long *ptr; 839 840 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size); 841 842 /* Move original AMODE31 section to the new one */ 843 memmove((void *)__amode31_base, (void *)__samode31, amode31_size); 844 /* Zero out the old AMODE31 section to catch invalid accesses within it */ 845 memset((void *)__samode31, 0, amode31_size); 846 847 /* Update all AMODE31 region references */ 848 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++) 849 *ptr += amode31_offset; 850 } 851 852 /* This must be called after AMODE31 relocation */ 853 static void __init setup_cr(void) 854 { 855 union ctlreg2 cr2; 856 union ctlreg5 cr5; 857 union ctlreg15 cr15; 858 859 __ctl_duct[1] = (unsigned long)__ctl_aste; 860 __ctl_duct[2] = (unsigned long)__ctl_aste; 861 __ctl_duct[4] = (unsigned long)__ctl_duald; 862 863 /* Update control registers CR2, CR5 and CR15 */ 864 __ctl_store(cr2.val, 2, 2); 865 __ctl_store(cr5.val, 5, 5); 866 __ctl_store(cr15.val, 15, 15); 867 cr2.ducto = (unsigned long)__ctl_duct >> 6; 868 cr5.pasteo = (unsigned long)__ctl_duct >> 6; 869 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3; 870 __ctl_load(cr2.val, 2, 2); 871 __ctl_load(cr5.val, 5, 5); 872 __ctl_load(cr15.val, 15, 15); 873 } 874 875 /* 876 * Add system information as device randomness 877 */ 878 static void __init setup_randomness(void) 879 { 880 struct sysinfo_3_2_2 *vmms; 881 882 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 883 if (!vmms) 884 panic("Failed to allocate memory for sysinfo structure\n"); 885 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 886 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 887 memblock_free(vmms, PAGE_SIZE); 888 } 889 890 /* 891 * Find the correct size for the task_struct. This depends on 892 * the size of the struct fpu at the end of the thread_struct 893 * which is embedded in the task_struct. 894 */ 895 static void __init setup_task_size(void) 896 { 897 int task_size = sizeof(struct task_struct); 898 899 if (!MACHINE_HAS_VX) { 900 task_size -= sizeof(__vector128) * __NUM_VXRS; 901 task_size += sizeof(freg_t) * __NUM_FPRS; 902 } 903 arch_task_struct_size = task_size; 904 } 905 906 /* 907 * Issue diagnose 318 to set the control program name and 908 * version codes. 909 */ 910 static void __init setup_control_program_code(void) 911 { 912 union diag318_info diag318_info = { 913 .cpnc = CPNC_LINUX, 914 .cpvc = 0, 915 }; 916 917 if (!sclp.has_diag318) 918 return; 919 920 diag_stat_inc(DIAG_STAT_X318); 921 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 922 } 923 924 /* 925 * Print the component list from the IPL report 926 */ 927 static void __init log_component_list(void) 928 { 929 struct ipl_rb_component_entry *ptr, *end; 930 char *str; 931 932 if (!early_ipl_comp_list_addr) 933 return; 934 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) 935 pr_info("Linux is running with Secure-IPL enabled\n"); 936 else 937 pr_info("Linux is running with Secure-IPL disabled\n"); 938 ptr = (void *) early_ipl_comp_list_addr; 939 end = (void *) ptr + early_ipl_comp_list_size; 940 pr_info("The IPL report contains the following components:\n"); 941 while (ptr < end) { 942 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 943 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 944 str = "signed, verified"; 945 else 946 str = "signed, verification failed"; 947 } else { 948 str = "not signed"; 949 } 950 pr_info("%016llx - %016llx (%s)\n", 951 ptr->addr, ptr->addr + ptr->len, str); 952 ptr++; 953 } 954 } 955 956 /* 957 * Setup function called from init/main.c just after the banner 958 * was printed. 959 */ 960 961 void __init setup_arch(char **cmdline_p) 962 { 963 /* 964 * print what head.S has found out about the machine 965 */ 966 if (MACHINE_IS_VM) 967 pr_info("Linux is running as a z/VM " 968 "guest operating system in 64-bit mode\n"); 969 else if (MACHINE_IS_KVM) 970 pr_info("Linux is running under KVM in 64-bit mode\n"); 971 else if (MACHINE_IS_LPAR) 972 pr_info("Linux is running natively in 64-bit mode\n"); 973 else 974 pr_info("Linux is running as a guest in 64-bit mode\n"); 975 976 log_component_list(); 977 978 /* Have one command line that is parsed and saved in /proc/cmdline */ 979 /* boot_command_line has been already set up in early.c */ 980 *cmdline_p = boot_command_line; 981 982 ROOT_DEV = Root_RAM0; 983 984 setup_initial_init_mm(_text, _etext, _edata, _end); 985 986 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 987 nospec_auto_detect(); 988 989 jump_label_init(); 990 parse_early_param(); 991 #ifdef CONFIG_CRASH_DUMP 992 /* Deactivate elfcorehdr= kernel parameter */ 993 elfcorehdr_addr = ELFCORE_ADDR_MAX; 994 #endif 995 996 os_info_init(); 997 setup_ipl(); 998 setup_task_size(); 999 setup_control_program_code(); 1000 1001 /* Do some memory reservations *before* memory is added to memblock */ 1002 reserve_above_ident_map(); 1003 reserve_kernel(); 1004 reserve_initrd(); 1005 reserve_certificate_list(); 1006 reserve_mem_detect_info(); 1007 memblock_allow_resize(); 1008 1009 /* Get information about *all* installed memory */ 1010 memblock_add_mem_detect_info(); 1011 1012 free_mem_detect_info(); 1013 1014 relocate_amode31_section(); 1015 setup_cr(); 1016 1017 setup_uv(); 1018 setup_memory_end(); 1019 setup_memory(); 1020 dma_contiguous_reserve(ident_map_size); 1021 vmcp_cma_reserve(); 1022 if (MACHINE_HAS_EDAT2) 1023 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 1024 1025 check_initrd(); 1026 reserve_crashkernel(); 1027 #ifdef CONFIG_CRASH_DUMP 1028 /* 1029 * Be aware that smp_save_dump_cpus() triggers a system reset. 1030 * Therefore CPU and device initialization should be done afterwards. 1031 */ 1032 smp_save_dump_cpus(); 1033 #endif 1034 1035 setup_resources(); 1036 setup_lowcore_dat_off(); 1037 smp_fill_possible_mask(); 1038 cpu_detect_mhz_feature(); 1039 cpu_init(); 1040 numa_setup(); 1041 smp_detect_cpus(); 1042 topology_init_early(); 1043 1044 if (test_facility(193)) 1045 static_branch_enable(&cpu_has_bear); 1046 1047 /* 1048 * Create kernel page tables and switch to virtual addressing. 1049 */ 1050 paging_init(); 1051 1052 /* 1053 * After paging_init created the kernel page table, the new PSWs 1054 * in lowcore can now run with DAT enabled. 1055 */ 1056 setup_lowcore_dat_on(); 1057 1058 /* Setup default console */ 1059 conmode_default(); 1060 set_preferred_console(); 1061 1062 apply_alternative_instructions(); 1063 if (IS_ENABLED(CONFIG_EXPOLINE)) 1064 nospec_init_branches(); 1065 1066 /* Setup zfcp/nvme dump support */ 1067 setup_zfcpdump(); 1068 1069 /* Add system specific data to the random pool */ 1070 setup_randomness(); 1071 } 1072