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-contiguous.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 53 #include <asm/ipl.h> 54 #include <asm/facility.h> 55 #include <asm/smp.h> 56 #include <asm/mmu_context.h> 57 #include <asm/cpcmd.h> 58 #include <asm/lowcore.h> 59 #include <asm/nmi.h> 60 #include <asm/irq.h> 61 #include <asm/page.h> 62 #include <asm/ptrace.h> 63 #include <asm/sections.h> 64 #include <asm/ebcdic.h> 65 #include <asm/diag.h> 66 #include <asm/os_info.h> 67 #include <asm/sclp.h> 68 #include <asm/sysinfo.h> 69 #include <asm/numa.h> 70 #include <asm/alternative.h> 71 #include <asm/nospec-branch.h> 72 #include <asm/mem_detect.h> 73 #include "entry.h" 74 75 /* 76 * Machine setup.. 77 */ 78 unsigned int console_mode = 0; 79 EXPORT_SYMBOL(console_mode); 80 81 unsigned int console_devno = -1; 82 EXPORT_SYMBOL(console_devno); 83 84 unsigned int console_irq = -1; 85 EXPORT_SYMBOL(console_irq); 86 87 unsigned long elf_hwcap __read_mostly = 0; 88 char elf_platform[ELF_PLATFORM_SIZE]; 89 90 unsigned long int_hwcap = 0; 91 92 int __bootdata(noexec_disabled); 93 int __bootdata(memory_end_set); 94 unsigned long __bootdata(memory_end); 95 unsigned long __bootdata(max_physmem_end); 96 struct mem_detect_info __bootdata(mem_detect); 97 98 unsigned long VMALLOC_START; 99 EXPORT_SYMBOL(VMALLOC_START); 100 101 unsigned long VMALLOC_END; 102 EXPORT_SYMBOL(VMALLOC_END); 103 104 struct page *vmemmap; 105 EXPORT_SYMBOL(vmemmap); 106 107 unsigned long MODULES_VADDR; 108 unsigned long MODULES_END; 109 110 /* An array with a pointer to the lowcore of every CPU. */ 111 struct lowcore *lowcore_ptr[NR_CPUS]; 112 EXPORT_SYMBOL(lowcore_ptr); 113 114 /* 115 * This is set up by the setup-routine at boot-time 116 * for S390 need to find out, what we have to setup 117 * using address 0x10400 ... 118 */ 119 120 #include <asm/setup.h> 121 122 /* 123 * condev= and conmode= setup parameter. 124 */ 125 126 static int __init condev_setup(char *str) 127 { 128 int vdev; 129 130 vdev = simple_strtoul(str, &str, 0); 131 if (vdev >= 0 && vdev < 65536) { 132 console_devno = vdev; 133 console_irq = -1; 134 } 135 return 1; 136 } 137 138 __setup("condev=", condev_setup); 139 140 static void __init set_preferred_console(void) 141 { 142 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 143 add_preferred_console("ttyS", 0, NULL); 144 else if (CONSOLE_IS_3270) 145 add_preferred_console("tty3270", 0, NULL); 146 else if (CONSOLE_IS_VT220) 147 add_preferred_console("ttyS", 1, NULL); 148 else if (CONSOLE_IS_HVC) 149 add_preferred_console("hvc", 0, NULL); 150 } 151 152 static int __init conmode_setup(char *str) 153 { 154 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 155 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 156 SET_CONSOLE_SCLP; 157 #endif 158 #if defined(CONFIG_TN3215_CONSOLE) 159 if (strncmp(str, "3215", 5) == 0) 160 SET_CONSOLE_3215; 161 #endif 162 #if defined(CONFIG_TN3270_CONSOLE) 163 if (strncmp(str, "3270", 5) == 0) 164 SET_CONSOLE_3270; 165 #endif 166 set_preferred_console(); 167 return 1; 168 } 169 170 __setup("conmode=", conmode_setup); 171 172 static void __init conmode_default(void) 173 { 174 char query_buffer[1024]; 175 char *ptr; 176 177 if (MACHINE_IS_VM) { 178 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 179 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 180 ptr = strstr(query_buffer, "SUBCHANNEL ="); 181 console_irq = simple_strtoul(ptr + 13, NULL, 16); 182 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 183 ptr = strstr(query_buffer, "CONMODE"); 184 /* 185 * Set the conmode to 3215 so that the device recognition 186 * will set the cu_type of the console to 3215. If the 187 * conmode is 3270 and we don't set it back then both 188 * 3215 and the 3270 driver will try to access the console 189 * device (3215 as console and 3270 as normal tty). 190 */ 191 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 192 if (ptr == NULL) { 193 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 194 SET_CONSOLE_SCLP; 195 #endif 196 return; 197 } 198 if (strncmp(ptr + 8, "3270", 4) == 0) { 199 #if defined(CONFIG_TN3270_CONSOLE) 200 SET_CONSOLE_3270; 201 #elif defined(CONFIG_TN3215_CONSOLE) 202 SET_CONSOLE_3215; 203 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 204 SET_CONSOLE_SCLP; 205 #endif 206 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 207 #if defined(CONFIG_TN3215_CONSOLE) 208 SET_CONSOLE_3215; 209 #elif defined(CONFIG_TN3270_CONSOLE) 210 SET_CONSOLE_3270; 211 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 212 SET_CONSOLE_SCLP; 213 #endif 214 } 215 } else if (MACHINE_IS_KVM) { 216 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 217 SET_CONSOLE_VT220; 218 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 219 SET_CONSOLE_SCLP; 220 else 221 SET_CONSOLE_HVC; 222 } else { 223 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 224 SET_CONSOLE_SCLP; 225 #endif 226 } 227 if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE)) 228 conswitchp = &dummy_con; 229 } 230 231 #ifdef CONFIG_CRASH_DUMP 232 static void __init setup_zfcpdump(void) 233 { 234 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 235 return; 236 if (OLDMEM_BASE) 237 return; 238 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 239 console_loglevel = 2; 240 } 241 #else 242 static inline void setup_zfcpdump(void) {} 243 #endif /* CONFIG_CRASH_DUMP */ 244 245 /* 246 * Reboot, halt and power_off stubs. They just call _machine_restart, 247 * _machine_halt or _machine_power_off. 248 */ 249 250 void machine_restart(char *command) 251 { 252 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 253 /* 254 * Only unblank the console if we are called in enabled 255 * context or a bust_spinlocks cleared the way for us. 256 */ 257 console_unblank(); 258 _machine_restart(command); 259 } 260 261 void machine_halt(void) 262 { 263 if (!in_interrupt() || oops_in_progress) 264 /* 265 * Only unblank the console if we are called in enabled 266 * context or a bust_spinlocks cleared the way for us. 267 */ 268 console_unblank(); 269 _machine_halt(); 270 } 271 272 void machine_power_off(void) 273 { 274 if (!in_interrupt() || oops_in_progress) 275 /* 276 * Only unblank the console if we are called in enabled 277 * context or a bust_spinlocks cleared the way for us. 278 */ 279 console_unblank(); 280 _machine_power_off(); 281 } 282 283 /* 284 * Dummy power off function. 285 */ 286 void (*pm_power_off)(void) = machine_power_off; 287 EXPORT_SYMBOL_GPL(pm_power_off); 288 289 static int __init parse_vmalloc(char *arg) 290 { 291 if (!arg) 292 return -EINVAL; 293 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 294 return 0; 295 } 296 early_param("vmalloc", parse_vmalloc); 297 298 void *restart_stack __section(.data); 299 300 unsigned long stack_alloc(void) 301 { 302 #ifdef CONFIG_VMAP_STACK 303 return (unsigned long) 304 __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE, 305 VMALLOC_START, VMALLOC_END, 306 THREADINFO_GFP, 307 PAGE_KERNEL, 0, NUMA_NO_NODE, 308 __builtin_return_address(0)); 309 #else 310 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 311 #endif 312 } 313 314 void stack_free(unsigned long stack) 315 { 316 #ifdef CONFIG_VMAP_STACK 317 vfree((void *) stack); 318 #else 319 free_pages(stack, THREAD_SIZE_ORDER); 320 #endif 321 } 322 323 int __init arch_early_irq_init(void) 324 { 325 unsigned long stack; 326 327 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 328 if (!stack) 329 panic("Couldn't allocate async stack"); 330 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET; 331 return 0; 332 } 333 334 static int __init async_stack_realloc(void) 335 { 336 unsigned long old, new; 337 338 old = S390_lowcore.async_stack - STACK_INIT_OFFSET; 339 new = stack_alloc(); 340 if (!new) 341 panic("Couldn't allocate async stack"); 342 S390_lowcore.async_stack = new + STACK_INIT_OFFSET; 343 free_pages(old, THREAD_SIZE_ORDER); 344 return 0; 345 } 346 early_initcall(async_stack_realloc); 347 348 void __init arch_call_rest_init(void) 349 { 350 struct stack_frame *frame; 351 unsigned long stack; 352 353 stack = stack_alloc(); 354 if (!stack) 355 panic("Couldn't allocate kernel stack"); 356 current->stack = (void *) stack; 357 #ifdef CONFIG_VMAP_STACK 358 current->stack_vm_area = (void *) stack; 359 #endif 360 set_task_stack_end_magic(current); 361 stack += STACK_INIT_OFFSET; 362 S390_lowcore.kernel_stack = stack; 363 frame = (struct stack_frame *) stack; 364 memset(frame, 0, sizeof(*frame)); 365 /* Branch to rest_init on the new stack, never returns */ 366 asm volatile( 367 " la 15,0(%[_frame])\n" 368 " jg rest_init\n" 369 : : [_frame] "a" (frame)); 370 } 371 372 static void __init setup_lowcore_dat_off(void) 373 { 374 struct lowcore *lc; 375 376 /* 377 * Setup lowcore for boot cpu 378 */ 379 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 380 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 381 lc->restart_psw.mask = PSW_KERNEL_BITS; 382 lc->restart_psw.addr = (unsigned long) restart_int_handler; 383 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 384 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 385 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 386 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 387 lc->svc_new_psw.addr = (unsigned long) system_call; 388 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 389 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 390 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 391 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 392 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 393 lc->io_new_psw.addr = (unsigned long) io_int_handler; 394 lc->clock_comparator = clock_comparator_max; 395 lc->nodat_stack = ((unsigned long) &init_thread_union) 396 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 397 lc->current_task = (unsigned long)&init_task; 398 lc->lpp = LPP_MAGIC; 399 lc->machine_flags = S390_lowcore.machine_flags; 400 lc->preempt_count = S390_lowcore.preempt_count; 401 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 402 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 403 sizeof(lc->stfle_fac_list)); 404 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list, 405 sizeof(lc->alt_stfle_fac_list)); 406 nmi_alloc_boot_cpu(lc); 407 vdso_alloc_boot_cpu(lc); 408 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 409 lc->async_enter_timer = S390_lowcore.async_enter_timer; 410 lc->exit_timer = S390_lowcore.exit_timer; 411 lc->user_timer = S390_lowcore.user_timer; 412 lc->system_timer = S390_lowcore.system_timer; 413 lc->steal_timer = S390_lowcore.steal_timer; 414 lc->last_update_timer = S390_lowcore.last_update_timer; 415 lc->last_update_clock = S390_lowcore.last_update_clock; 416 417 /* 418 * Allocate the global restart stack which is the same for 419 * all CPUs in cast *one* of them does a PSW restart. 420 */ 421 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE); 422 restart_stack += STACK_INIT_OFFSET; 423 424 /* 425 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 426 * restart data to the absolute zero lowcore. This is necessary if 427 * PSW restart is done on an offline CPU that has lowcore zero. 428 */ 429 lc->restart_stack = (unsigned long) restart_stack; 430 lc->restart_fn = (unsigned long) do_restart; 431 lc->restart_data = 0; 432 lc->restart_source = -1UL; 433 434 /* Setup absolute zero lowcore */ 435 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 436 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 437 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 438 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 439 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 440 441 #ifdef CONFIG_SMP 442 lc->spinlock_lockval = arch_spin_lockval(0); 443 lc->spinlock_index = 0; 444 arch_spin_lock_setup(0); 445 #endif 446 lc->br_r1_trampoline = 0x07f1; /* br %r1 */ 447 448 set_prefix((u32)(unsigned long) lc); 449 lowcore_ptr[0] = lc; 450 } 451 452 static void __init setup_lowcore_dat_on(void) 453 { 454 __ctl_clear_bit(0, 28); 455 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; 456 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; 457 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; 458 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; 459 __ctl_set_bit(0, 28); 460 } 461 462 static struct resource code_resource = { 463 .name = "Kernel code", 464 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 465 }; 466 467 static struct resource data_resource = { 468 .name = "Kernel data", 469 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 470 }; 471 472 static struct resource bss_resource = { 473 .name = "Kernel bss", 474 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 475 }; 476 477 static struct resource __initdata *standard_resources[] = { 478 &code_resource, 479 &data_resource, 480 &bss_resource, 481 }; 482 483 static void __init setup_resources(void) 484 { 485 struct resource *res, *std_res, *sub_res; 486 struct memblock_region *reg; 487 int j; 488 489 code_resource.start = (unsigned long) _text; 490 code_resource.end = (unsigned long) _etext - 1; 491 data_resource.start = (unsigned long) _etext; 492 data_resource.end = (unsigned long) _edata - 1; 493 bss_resource.start = (unsigned long) __bss_start; 494 bss_resource.end = (unsigned long) __bss_stop - 1; 495 496 for_each_memblock(memory, reg) { 497 res = memblock_alloc(sizeof(*res), 8); 498 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 499 500 res->name = "System RAM"; 501 res->start = reg->base; 502 res->end = reg->base + reg->size - 1; 503 request_resource(&iomem_resource, res); 504 505 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 506 std_res = standard_resources[j]; 507 if (std_res->start < res->start || 508 std_res->start > res->end) 509 continue; 510 if (std_res->end > res->end) { 511 sub_res = memblock_alloc(sizeof(*sub_res), 8); 512 *sub_res = *std_res; 513 sub_res->end = res->end; 514 std_res->start = res->end + 1; 515 request_resource(res, sub_res); 516 } else { 517 request_resource(res, std_res); 518 } 519 } 520 } 521 #ifdef CONFIG_CRASH_DUMP 522 /* 523 * Re-add removed crash kernel memory as reserved memory. This makes 524 * sure it will be mapped with the identity mapping and struct pages 525 * will be created, so it can be resized later on. 526 * However add it later since the crash kernel resource should not be 527 * part of the System RAM resource. 528 */ 529 if (crashk_res.end) { 530 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); 531 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 532 insert_resource(&iomem_resource, &crashk_res); 533 } 534 #endif 535 } 536 537 static void __init setup_memory_end(void) 538 { 539 unsigned long vmax, vmalloc_size, tmp; 540 541 /* Choose kernel address space layout: 3 or 4 levels. */ 542 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 543 if (IS_ENABLED(CONFIG_KASAN)) { 544 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING) 545 ? _REGION1_SIZE 546 : _REGION2_SIZE; 547 } else { 548 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 549 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 550 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) 551 vmax = _REGION2_SIZE; /* 3-level kernel page table */ 552 else 553 vmax = _REGION1_SIZE; /* 4-level kernel page table */ 554 } 555 556 /* module area is at the end of the kernel address space. */ 557 MODULES_END = vmax; 558 MODULES_VADDR = MODULES_END - MODULES_LEN; 559 VMALLOC_END = MODULES_VADDR; 560 VMALLOC_START = VMALLOC_END - vmalloc_size; 561 562 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 563 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 564 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 565 tmp = SECTION_ALIGN_UP(tmp); 566 tmp = VMALLOC_START - tmp * sizeof(struct page); 567 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 568 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 569 vmemmap = (struct page *) tmp; 570 571 /* Take care that memory_end is set and <= vmemmap */ 572 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap); 573 #ifdef CONFIG_KASAN 574 /* fit in kasan shadow memory region between 1:1 and vmemmap */ 575 memory_end = min(memory_end, KASAN_SHADOW_START); 576 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END); 577 #endif 578 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 579 memblock_remove(memory_end, ULONG_MAX); 580 581 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20); 582 } 583 584 #ifdef CONFIG_CRASH_DUMP 585 586 /* 587 * When kdump is enabled, we have to ensure that no memory from 588 * the area [0 - crashkernel memory size] and 589 * [crashk_res.start - crashk_res.end] is set offline. 590 */ 591 static int kdump_mem_notifier(struct notifier_block *nb, 592 unsigned long action, void *data) 593 { 594 struct memory_notify *arg = data; 595 596 if (action != MEM_GOING_OFFLINE) 597 return NOTIFY_OK; 598 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 599 return NOTIFY_BAD; 600 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 601 return NOTIFY_OK; 602 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 603 return NOTIFY_OK; 604 return NOTIFY_BAD; 605 } 606 607 static struct notifier_block kdump_mem_nb = { 608 .notifier_call = kdump_mem_notifier, 609 }; 610 611 #endif 612 613 /* 614 * Make sure that the area behind memory_end is protected 615 */ 616 static void reserve_memory_end(void) 617 { 618 if (memory_end_set) 619 memblock_reserve(memory_end, ULONG_MAX); 620 } 621 622 /* 623 * Make sure that oldmem, where the dump is stored, is protected 624 */ 625 static void reserve_oldmem(void) 626 { 627 #ifdef CONFIG_CRASH_DUMP 628 if (OLDMEM_BASE) 629 /* Forget all memory above the running kdump system */ 630 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 631 #endif 632 } 633 634 /* 635 * Make sure that oldmem, where the dump is stored, is protected 636 */ 637 static void remove_oldmem(void) 638 { 639 #ifdef CONFIG_CRASH_DUMP 640 if (OLDMEM_BASE) 641 /* Forget all memory above the running kdump system */ 642 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 643 #endif 644 } 645 646 /* 647 * Reserve memory for kdump kernel to be loaded with kexec 648 */ 649 static void __init reserve_crashkernel(void) 650 { 651 #ifdef CONFIG_CRASH_DUMP 652 unsigned long long crash_base, crash_size; 653 phys_addr_t low, high; 654 int rc; 655 656 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 657 &crash_base); 658 659 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 660 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 661 if (rc || crash_size == 0) 662 return; 663 664 if (memblock.memory.regions[0].size < crash_size) { 665 pr_info("crashkernel reservation failed: %s\n", 666 "first memory chunk must be at least crashkernel size"); 667 return; 668 } 669 670 low = crash_base ?: OLDMEM_BASE; 671 high = low + crash_size; 672 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 673 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 674 crash_base = low; 675 } else { 676 /* Find suitable area in free memory */ 677 low = max_t(unsigned long, crash_size, sclp.hsa_size); 678 high = crash_base ? crash_base + crash_size : ULONG_MAX; 679 680 if (crash_base && crash_base < low) { 681 pr_info("crashkernel reservation failed: %s\n", 682 "crash_base too low"); 683 return; 684 } 685 low = crash_base ?: low; 686 crash_base = memblock_find_in_range(low, high, crash_size, 687 KEXEC_CRASH_MEM_ALIGN); 688 } 689 690 if (!crash_base) { 691 pr_info("crashkernel reservation failed: %s\n", 692 "no suitable area found"); 693 return; 694 } 695 696 if (register_memory_notifier(&kdump_mem_nb)) 697 return; 698 699 if (!OLDMEM_BASE && MACHINE_IS_VM) 700 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 701 crashk_res.start = crash_base; 702 crashk_res.end = crash_base + crash_size - 1; 703 memblock_remove(crash_base, crash_size); 704 pr_info("Reserving %lluMB of memory at %lluMB " 705 "for crashkernel (System RAM: %luMB)\n", 706 crash_size >> 20, crash_base >> 20, 707 (unsigned long)memblock.memory.total_size >> 20); 708 os_info_crashkernel_add(crash_base, crash_size); 709 #endif 710 } 711 712 /* 713 * Reserve the initrd from being used by memblock 714 */ 715 static void __init reserve_initrd(void) 716 { 717 #ifdef CONFIG_BLK_DEV_INITRD 718 if (!INITRD_START || !INITRD_SIZE) 719 return; 720 initrd_start = INITRD_START; 721 initrd_end = initrd_start + INITRD_SIZE; 722 memblock_reserve(INITRD_START, INITRD_SIZE); 723 #endif 724 } 725 726 static void __init reserve_mem_detect_info(void) 727 { 728 unsigned long start, size; 729 730 get_mem_detect_reserved(&start, &size); 731 if (size) 732 memblock_reserve(start, size); 733 } 734 735 static void __init free_mem_detect_info(void) 736 { 737 unsigned long start, size; 738 739 get_mem_detect_reserved(&start, &size); 740 if (size) 741 memblock_free(start, size); 742 } 743 744 static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size) 745 { 746 memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n", 747 start, start + size - 1); 748 memblock_add_range(&memblock.memory, start, size, 0, 0); 749 memblock_add_range(&memblock.physmem, start, size, 0, 0); 750 } 751 752 static const char * __init get_mem_info_source(void) 753 { 754 switch (mem_detect.info_source) { 755 case MEM_DETECT_SCLP_STOR_INFO: 756 return "sclp storage info"; 757 case MEM_DETECT_DIAG260: 758 return "diag260"; 759 case MEM_DETECT_SCLP_READ_INFO: 760 return "sclp read info"; 761 case MEM_DETECT_BIN_SEARCH: 762 return "binary search"; 763 } 764 return "none"; 765 } 766 767 static void __init memblock_add_mem_detect_info(void) 768 { 769 unsigned long start, end; 770 int i; 771 772 memblock_dbg("physmem info source: %s (%hhd)\n", 773 get_mem_info_source(), mem_detect.info_source); 774 /* keep memblock lists close to the kernel */ 775 memblock_set_bottom_up(true); 776 for_each_mem_detect_block(i, &start, &end) 777 memblock_physmem_add(start, end - start); 778 memblock_set_bottom_up(false); 779 memblock_dump_all(); 780 } 781 782 /* 783 * Check for initrd being in usable memory 784 */ 785 static void __init check_initrd(void) 786 { 787 #ifdef CONFIG_BLK_DEV_INITRD 788 if (INITRD_START && INITRD_SIZE && 789 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 790 pr_err("The initial RAM disk does not fit into the memory\n"); 791 memblock_free(INITRD_START, INITRD_SIZE); 792 initrd_start = initrd_end = 0; 793 } 794 #endif 795 } 796 797 /* 798 * Reserve memory used for lowcore/command line/kernel image. 799 */ 800 static void __init reserve_kernel(void) 801 { 802 unsigned long start_pfn = PFN_UP(__pa(_end)); 803 804 memblock_reserve(0, PARMAREA_END); 805 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 806 - (unsigned long)_stext); 807 } 808 809 static void __init setup_memory(void) 810 { 811 struct memblock_region *reg; 812 813 /* 814 * Init storage key for present memory 815 */ 816 for_each_memblock(memory, reg) { 817 storage_key_init_range(reg->base, reg->base + reg->size); 818 } 819 psw_set_key(PAGE_DEFAULT_KEY); 820 821 /* Only cosmetics */ 822 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 823 } 824 825 /* 826 * Setup hardware capabilities. 827 */ 828 static int __init setup_hwcaps(void) 829 { 830 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 831 struct cpuid cpu_id; 832 int i; 833 834 /* 835 * The store facility list bits numbers as found in the principles 836 * of operation are numbered with bit 1UL<<31 as number 0 to 837 * bit 1UL<<0 as number 31. 838 * Bit 0: instructions named N3, "backported" to esa-mode 839 * Bit 2: z/Architecture mode is active 840 * Bit 7: the store-facility-list-extended facility is installed 841 * Bit 17: the message-security assist is installed 842 * Bit 19: the long-displacement facility is installed 843 * Bit 21: the extended-immediate facility is installed 844 * Bit 22: extended-translation facility 3 is installed 845 * Bit 30: extended-translation facility 3 enhancement facility 846 * These get translated to: 847 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 848 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 849 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 850 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 851 */ 852 for (i = 0; i < 6; i++) 853 if (test_facility(stfl_bits[i])) 854 elf_hwcap |= 1UL << i; 855 856 if (test_facility(22) && test_facility(30)) 857 elf_hwcap |= HWCAP_S390_ETF3EH; 858 859 /* 860 * Check for additional facilities with store-facility-list-extended. 861 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 862 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 863 * as stored by stfl, bits 32-xxx contain additional facilities. 864 * How many facility words are stored depends on the number of 865 * doublewords passed to the instruction. The additional facilities 866 * are: 867 * Bit 42: decimal floating point facility is installed 868 * Bit 44: perform floating point operation facility is installed 869 * translated to: 870 * HWCAP_S390_DFP bit 6 (42 && 44). 871 */ 872 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 873 elf_hwcap |= HWCAP_S390_DFP; 874 875 /* 876 * Huge page support HWCAP_S390_HPAGE is bit 7. 877 */ 878 if (MACHINE_HAS_EDAT1) 879 elf_hwcap |= HWCAP_S390_HPAGE; 880 881 /* 882 * 64-bit register support for 31-bit processes 883 * HWCAP_S390_HIGH_GPRS is bit 9. 884 */ 885 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 886 887 /* 888 * Transactional execution support HWCAP_S390_TE is bit 10. 889 */ 890 if (MACHINE_HAS_TE) 891 elf_hwcap |= HWCAP_S390_TE; 892 893 /* 894 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 895 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 896 * instead of facility bit 129. 897 */ 898 if (MACHINE_HAS_VX) { 899 elf_hwcap |= HWCAP_S390_VXRS; 900 if (test_facility(134)) 901 elf_hwcap |= HWCAP_S390_VXRS_EXT; 902 if (test_facility(135)) 903 elf_hwcap |= HWCAP_S390_VXRS_BCD; 904 } 905 906 /* 907 * Guarded storage support HWCAP_S390_GS is bit 12. 908 */ 909 if (MACHINE_HAS_GS) 910 elf_hwcap |= HWCAP_S390_GS; 911 912 get_cpu_id(&cpu_id); 913 add_device_randomness(&cpu_id, sizeof(cpu_id)); 914 switch (cpu_id.machine) { 915 case 0x2064: 916 case 0x2066: 917 default: /* Use "z900" as default for 64 bit kernels. */ 918 strcpy(elf_platform, "z900"); 919 break; 920 case 0x2084: 921 case 0x2086: 922 strcpy(elf_platform, "z990"); 923 break; 924 case 0x2094: 925 case 0x2096: 926 strcpy(elf_platform, "z9-109"); 927 break; 928 case 0x2097: 929 case 0x2098: 930 strcpy(elf_platform, "z10"); 931 break; 932 case 0x2817: 933 case 0x2818: 934 strcpy(elf_platform, "z196"); 935 break; 936 case 0x2827: 937 case 0x2828: 938 strcpy(elf_platform, "zEC12"); 939 break; 940 case 0x2964: 941 case 0x2965: 942 strcpy(elf_platform, "z13"); 943 break; 944 case 0x3906: 945 case 0x3907: 946 strcpy(elf_platform, "z14"); 947 break; 948 } 949 950 /* 951 * Virtualization support HWCAP_INT_SIE is bit 0. 952 */ 953 if (sclp.has_sief2) 954 int_hwcap |= HWCAP_INT_SIE; 955 956 return 0; 957 } 958 arch_initcall(setup_hwcaps); 959 960 /* 961 * Add system information as device randomness 962 */ 963 static void __init setup_randomness(void) 964 { 965 struct sysinfo_3_2_2 *vmms; 966 967 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE, 968 PAGE_SIZE); 969 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 970 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 971 memblock_free((unsigned long) vmms, PAGE_SIZE); 972 } 973 974 /* 975 * Find the correct size for the task_struct. This depends on 976 * the size of the struct fpu at the end of the thread_struct 977 * which is embedded in the task_struct. 978 */ 979 static void __init setup_task_size(void) 980 { 981 int task_size = sizeof(struct task_struct); 982 983 if (!MACHINE_HAS_VX) { 984 task_size -= sizeof(__vector128) * __NUM_VXRS; 985 task_size += sizeof(freg_t) * __NUM_FPRS; 986 } 987 arch_task_struct_size = task_size; 988 } 989 990 /* 991 * Issue diagnose 318 to set the control program name and 992 * version codes. 993 */ 994 static void __init setup_control_program_code(void) 995 { 996 union diag318_info diag318_info = { 997 .cpnc = CPNC_LINUX, 998 .cpvc_linux = 0, 999 .cpvc_distro = {0}, 1000 }; 1001 1002 if (!sclp.has_diag318) 1003 return; 1004 1005 diag_stat_inc(DIAG_STAT_X318); 1006 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 1007 } 1008 1009 /* 1010 * Setup function called from init/main.c just after the banner 1011 * was printed. 1012 */ 1013 1014 void __init setup_arch(char **cmdline_p) 1015 { 1016 /* 1017 * print what head.S has found out about the machine 1018 */ 1019 if (MACHINE_IS_VM) 1020 pr_info("Linux is running as a z/VM " 1021 "guest operating system in 64-bit mode\n"); 1022 else if (MACHINE_IS_KVM) 1023 pr_info("Linux is running under KVM in 64-bit mode\n"); 1024 else if (MACHINE_IS_LPAR) 1025 pr_info("Linux is running natively in 64-bit mode\n"); 1026 else 1027 pr_info("Linux is running as a guest in 64-bit mode\n"); 1028 1029 /* Have one command line that is parsed and saved in /proc/cmdline */ 1030 /* boot_command_line has been already set up in early.c */ 1031 *cmdline_p = boot_command_line; 1032 1033 ROOT_DEV = Root_RAM0; 1034 1035 /* Is init_mm really needed? */ 1036 init_mm.start_code = PAGE_OFFSET; 1037 init_mm.end_code = (unsigned long) _etext; 1038 init_mm.end_data = (unsigned long) _edata; 1039 init_mm.brk = (unsigned long) _end; 1040 1041 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 1042 nospec_auto_detect(); 1043 1044 parse_early_param(); 1045 #ifdef CONFIG_CRASH_DUMP 1046 /* Deactivate elfcorehdr= kernel parameter */ 1047 elfcorehdr_addr = ELFCORE_ADDR_MAX; 1048 #endif 1049 1050 os_info_init(); 1051 setup_ipl(); 1052 setup_task_size(); 1053 setup_control_program_code(); 1054 1055 /* Do some memory reservations *before* memory is added to memblock */ 1056 reserve_memory_end(); 1057 reserve_oldmem(); 1058 reserve_kernel(); 1059 reserve_initrd(); 1060 reserve_mem_detect_info(); 1061 memblock_allow_resize(); 1062 1063 /* Get information about *all* installed memory */ 1064 memblock_add_mem_detect_info(); 1065 1066 free_mem_detect_info(); 1067 remove_oldmem(); 1068 1069 /* 1070 * Make sure all chunks are MAX_ORDER aligned so we don't need the 1071 * extra checks that HOLES_IN_ZONE would require. 1072 * 1073 * Is this still required? 1074 */ 1075 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 1076 1077 setup_memory_end(); 1078 setup_memory(); 1079 dma_contiguous_reserve(memory_end); 1080 vmcp_cma_reserve(); 1081 1082 check_initrd(); 1083 reserve_crashkernel(); 1084 #ifdef CONFIG_CRASH_DUMP 1085 /* 1086 * Be aware that smp_save_dump_cpus() triggers a system reset. 1087 * Therefore CPU and device initialization should be done afterwards. 1088 */ 1089 smp_save_dump_cpus(); 1090 #endif 1091 1092 setup_resources(); 1093 setup_lowcore_dat_off(); 1094 smp_fill_possible_mask(); 1095 cpu_detect_mhz_feature(); 1096 cpu_init(); 1097 numa_setup(); 1098 smp_detect_cpus(); 1099 topology_init_early(); 1100 1101 /* 1102 * Create kernel page tables and switch to virtual addressing. 1103 */ 1104 paging_init(); 1105 1106 /* 1107 * After paging_init created the kernel page table, the new PSWs 1108 * in lowcore can now run with DAT enabled. 1109 */ 1110 setup_lowcore_dat_on(); 1111 1112 /* Setup default console */ 1113 conmode_default(); 1114 set_preferred_console(); 1115 1116 apply_alternative_instructions(); 1117 if (IS_ENABLED(CONFIG_EXPOLINE)) 1118 nospec_init_branches(); 1119 1120 /* Setup zfcpdump support */ 1121 setup_zfcpdump(); 1122 1123 /* Add system specific data to the random pool */ 1124 setup_randomness(); 1125 } 1126