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/boot_data.h> 54 #include <asm/ipl.h> 55 #include <asm/facility.h> 56 #include <asm/smp.h> 57 #include <asm/mmu_context.h> 58 #include <asm/cpcmd.h> 59 #include <asm/lowcore.h> 60 #include <asm/nmi.h> 61 #include <asm/irq.h> 62 #include <asm/page.h> 63 #include <asm/ptrace.h> 64 #include <asm/sections.h> 65 #include <asm/ebcdic.h> 66 #include <asm/diag.h> 67 #include <asm/os_info.h> 68 #include <asm/sclp.h> 69 #include <asm/stacktrace.h> 70 #include <asm/sysinfo.h> 71 #include <asm/numa.h> 72 #include <asm/alternative.h> 73 #include <asm/nospec-branch.h> 74 #include <asm/mem_detect.h> 75 #include <asm/uv.h> 76 #include "entry.h" 77 78 /* 79 * Machine setup.. 80 */ 81 unsigned int console_mode = 0; 82 EXPORT_SYMBOL(console_mode); 83 84 unsigned int console_devno = -1; 85 EXPORT_SYMBOL(console_devno); 86 87 unsigned int console_irq = -1; 88 EXPORT_SYMBOL(console_irq); 89 90 unsigned long elf_hwcap __read_mostly = 0; 91 char elf_platform[ELF_PLATFORM_SIZE]; 92 93 unsigned long int_hwcap = 0; 94 95 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST 96 int __bootdata_preserved(prot_virt_guest); 97 #endif 98 99 int __bootdata(noexec_disabled); 100 int __bootdata(memory_end_set); 101 unsigned long __bootdata(memory_end); 102 unsigned long __bootdata(max_physmem_end); 103 struct mem_detect_info __bootdata(mem_detect); 104 105 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table); 106 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table); 107 unsigned long __bootdata_preserved(__swsusp_reset_dma); 108 unsigned long __bootdata_preserved(__stext_dma); 109 unsigned long __bootdata_preserved(__etext_dma); 110 unsigned long __bootdata_preserved(__sdma); 111 unsigned long __bootdata_preserved(__edma); 112 unsigned long __bootdata_preserved(__kaslr_offset); 113 114 unsigned long VMALLOC_START; 115 EXPORT_SYMBOL(VMALLOC_START); 116 117 unsigned long VMALLOC_END; 118 EXPORT_SYMBOL(VMALLOC_END); 119 120 struct page *vmemmap; 121 EXPORT_SYMBOL(vmemmap); 122 123 unsigned long MODULES_VADDR; 124 unsigned long MODULES_END; 125 126 /* An array with a pointer to the lowcore of every CPU. */ 127 struct lowcore *lowcore_ptr[NR_CPUS]; 128 EXPORT_SYMBOL(lowcore_ptr); 129 130 /* 131 * This is set up by the setup-routine at boot-time 132 * for S390 need to find out, what we have to setup 133 * using address 0x10400 ... 134 */ 135 136 #include <asm/setup.h> 137 138 /* 139 * condev= and conmode= setup parameter. 140 */ 141 142 static int __init condev_setup(char *str) 143 { 144 int vdev; 145 146 vdev = simple_strtoul(str, &str, 0); 147 if (vdev >= 0 && vdev < 65536) { 148 console_devno = vdev; 149 console_irq = -1; 150 } 151 return 1; 152 } 153 154 __setup("condev=", condev_setup); 155 156 static void __init set_preferred_console(void) 157 { 158 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 159 add_preferred_console("ttyS", 0, NULL); 160 else if (CONSOLE_IS_3270) 161 add_preferred_console("tty3270", 0, NULL); 162 else if (CONSOLE_IS_VT220) 163 add_preferred_console("ttyS", 1, NULL); 164 else if (CONSOLE_IS_HVC) 165 add_preferred_console("hvc", 0, NULL); 166 } 167 168 static int __init conmode_setup(char *str) 169 { 170 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 171 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 172 SET_CONSOLE_SCLP; 173 #endif 174 #if defined(CONFIG_TN3215_CONSOLE) 175 if (strncmp(str, "3215", 5) == 0) 176 SET_CONSOLE_3215; 177 #endif 178 #if defined(CONFIG_TN3270_CONSOLE) 179 if (strncmp(str, "3270", 5) == 0) 180 SET_CONSOLE_3270; 181 #endif 182 set_preferred_console(); 183 return 1; 184 } 185 186 __setup("conmode=", conmode_setup); 187 188 static void __init conmode_default(void) 189 { 190 char query_buffer[1024]; 191 char *ptr; 192 193 if (MACHINE_IS_VM) { 194 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 195 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 196 ptr = strstr(query_buffer, "SUBCHANNEL ="); 197 console_irq = simple_strtoul(ptr + 13, NULL, 16); 198 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 199 ptr = strstr(query_buffer, "CONMODE"); 200 /* 201 * Set the conmode to 3215 so that the device recognition 202 * will set the cu_type of the console to 3215. If the 203 * conmode is 3270 and we don't set it back then both 204 * 3215 and the 3270 driver will try to access the console 205 * device (3215 as console and 3270 as normal tty). 206 */ 207 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 208 if (ptr == NULL) { 209 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 210 SET_CONSOLE_SCLP; 211 #endif 212 return; 213 } 214 if (strncmp(ptr + 8, "3270", 4) == 0) { 215 #if defined(CONFIG_TN3270_CONSOLE) 216 SET_CONSOLE_3270; 217 #elif defined(CONFIG_TN3215_CONSOLE) 218 SET_CONSOLE_3215; 219 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 220 SET_CONSOLE_SCLP; 221 #endif 222 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 223 #if defined(CONFIG_TN3215_CONSOLE) 224 SET_CONSOLE_3215; 225 #elif defined(CONFIG_TN3270_CONSOLE) 226 SET_CONSOLE_3270; 227 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 228 SET_CONSOLE_SCLP; 229 #endif 230 } 231 } else if (MACHINE_IS_KVM) { 232 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 233 SET_CONSOLE_VT220; 234 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 235 SET_CONSOLE_SCLP; 236 else 237 SET_CONSOLE_HVC; 238 } else { 239 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 240 SET_CONSOLE_SCLP; 241 #endif 242 } 243 if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE)) 244 conswitchp = &dummy_con; 245 } 246 247 #ifdef CONFIG_CRASH_DUMP 248 static void __init setup_zfcpdump(void) 249 { 250 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 251 return; 252 if (OLDMEM_BASE) 253 return; 254 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 255 console_loglevel = 2; 256 } 257 #else 258 static inline void setup_zfcpdump(void) {} 259 #endif /* CONFIG_CRASH_DUMP */ 260 261 /* 262 * Reboot, halt and power_off stubs. They just call _machine_restart, 263 * _machine_halt or _machine_power_off. 264 */ 265 266 void machine_restart(char *command) 267 { 268 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 269 /* 270 * Only unblank the console if we are called in enabled 271 * context or a bust_spinlocks cleared the way for us. 272 */ 273 console_unblank(); 274 _machine_restart(command); 275 } 276 277 void machine_halt(void) 278 { 279 if (!in_interrupt() || oops_in_progress) 280 /* 281 * Only unblank the console if we are called in enabled 282 * context or a bust_spinlocks cleared the way for us. 283 */ 284 console_unblank(); 285 _machine_halt(); 286 } 287 288 void machine_power_off(void) 289 { 290 if (!in_interrupt() || oops_in_progress) 291 /* 292 * Only unblank the console if we are called in enabled 293 * context or a bust_spinlocks cleared the way for us. 294 */ 295 console_unblank(); 296 _machine_power_off(); 297 } 298 299 /* 300 * Dummy power off function. 301 */ 302 void (*pm_power_off)(void) = machine_power_off; 303 EXPORT_SYMBOL_GPL(pm_power_off); 304 305 static int __init parse_vmalloc(char *arg) 306 { 307 if (!arg) 308 return -EINVAL; 309 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 310 return 0; 311 } 312 early_param("vmalloc", parse_vmalloc); 313 314 void *restart_stack __section(.data); 315 316 unsigned long stack_alloc(void) 317 { 318 #ifdef CONFIG_VMAP_STACK 319 return (unsigned long) 320 __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE, 321 VMALLOC_START, VMALLOC_END, 322 THREADINFO_GFP, 323 PAGE_KERNEL, 0, NUMA_NO_NODE, 324 __builtin_return_address(0)); 325 #else 326 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 327 #endif 328 } 329 330 void stack_free(unsigned long stack) 331 { 332 #ifdef CONFIG_VMAP_STACK 333 vfree((void *) stack); 334 #else 335 free_pages(stack, THREAD_SIZE_ORDER); 336 #endif 337 } 338 339 int __init arch_early_irq_init(void) 340 { 341 unsigned long stack; 342 343 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 344 if (!stack) 345 panic("Couldn't allocate async stack"); 346 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET; 347 return 0; 348 } 349 350 static int __init async_stack_realloc(void) 351 { 352 unsigned long old, new; 353 354 old = S390_lowcore.async_stack - STACK_INIT_OFFSET; 355 new = stack_alloc(); 356 if (!new) 357 panic("Couldn't allocate async stack"); 358 S390_lowcore.async_stack = new + STACK_INIT_OFFSET; 359 free_pages(old, THREAD_SIZE_ORDER); 360 return 0; 361 } 362 early_initcall(async_stack_realloc); 363 364 void __init arch_call_rest_init(void) 365 { 366 struct stack_frame *frame; 367 unsigned long stack; 368 369 stack = stack_alloc(); 370 if (!stack) 371 panic("Couldn't allocate kernel stack"); 372 current->stack = (void *) stack; 373 #ifdef CONFIG_VMAP_STACK 374 current->stack_vm_area = (void *) stack; 375 #endif 376 set_task_stack_end_magic(current); 377 stack += STACK_INIT_OFFSET; 378 S390_lowcore.kernel_stack = stack; 379 frame = (struct stack_frame *) stack; 380 memset(frame, 0, sizeof(*frame)); 381 /* Branch to rest_init on the new stack, never returns */ 382 asm volatile( 383 " la 15,0(%[_frame])\n" 384 " jg rest_init\n" 385 : : [_frame] "a" (frame)); 386 } 387 388 static void __init setup_lowcore_dat_off(void) 389 { 390 struct lowcore *lc; 391 392 /* 393 * Setup lowcore for boot cpu 394 */ 395 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 396 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 397 if (!lc) 398 panic("%s: Failed to allocate %zu bytes align=%zx\n", 399 __func__, sizeof(*lc), sizeof(*lc)); 400 401 lc->restart_psw.mask = PSW_KERNEL_BITS; 402 lc->restart_psw.addr = (unsigned long) restart_int_handler; 403 lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 404 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 405 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 406 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 407 lc->svc_new_psw.addr = (unsigned long) system_call; 408 lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 409 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 410 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 411 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 412 lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; 413 lc->io_new_psw.addr = (unsigned long) io_int_handler; 414 lc->clock_comparator = clock_comparator_max; 415 lc->nodat_stack = ((unsigned long) &init_thread_union) 416 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 417 lc->current_task = (unsigned long)&init_task; 418 lc->lpp = LPP_MAGIC; 419 lc->machine_flags = S390_lowcore.machine_flags; 420 lc->preempt_count = S390_lowcore.preempt_count; 421 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 422 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 423 sizeof(lc->stfle_fac_list)); 424 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list, 425 sizeof(lc->alt_stfle_fac_list)); 426 nmi_alloc_boot_cpu(lc); 427 vdso_alloc_boot_cpu(lc); 428 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 429 lc->async_enter_timer = S390_lowcore.async_enter_timer; 430 lc->exit_timer = S390_lowcore.exit_timer; 431 lc->user_timer = S390_lowcore.user_timer; 432 lc->system_timer = S390_lowcore.system_timer; 433 lc->steal_timer = S390_lowcore.steal_timer; 434 lc->last_update_timer = S390_lowcore.last_update_timer; 435 lc->last_update_clock = S390_lowcore.last_update_clock; 436 437 /* 438 * Allocate the global restart stack which is the same for 439 * all CPUs in cast *one* of them does a PSW restart. 440 */ 441 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE); 442 if (!restart_stack) 443 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 444 __func__, THREAD_SIZE, THREAD_SIZE); 445 restart_stack += STACK_INIT_OFFSET; 446 447 /* 448 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 449 * restart data to the absolute zero lowcore. This is necessary if 450 * PSW restart is done on an offline CPU that has lowcore zero. 451 */ 452 lc->restart_stack = (unsigned long) restart_stack; 453 lc->restart_fn = (unsigned long) do_restart; 454 lc->restart_data = 0; 455 lc->restart_source = -1UL; 456 457 /* Setup absolute zero lowcore */ 458 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 459 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 460 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 461 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 462 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 463 464 lc->spinlock_lockval = arch_spin_lockval(0); 465 lc->spinlock_index = 0; 466 arch_spin_lock_setup(0); 467 lc->br_r1_trampoline = 0x07f1; /* br %r1 */ 468 469 set_prefix((u32)(unsigned long) lc); 470 lowcore_ptr[0] = lc; 471 } 472 473 static void __init setup_lowcore_dat_on(void) 474 { 475 __ctl_clear_bit(0, 28); 476 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; 477 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; 478 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; 479 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; 480 __ctl_set_bit(0, 28); 481 } 482 483 static struct resource code_resource = { 484 .name = "Kernel code", 485 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 486 }; 487 488 static struct resource data_resource = { 489 .name = "Kernel data", 490 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 491 }; 492 493 static struct resource bss_resource = { 494 .name = "Kernel bss", 495 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 496 }; 497 498 static struct resource __initdata *standard_resources[] = { 499 &code_resource, 500 &data_resource, 501 &bss_resource, 502 }; 503 504 static void __init setup_resources(void) 505 { 506 struct resource *res, *std_res, *sub_res; 507 struct memblock_region *reg; 508 int j; 509 510 code_resource.start = (unsigned long) _text; 511 code_resource.end = (unsigned long) _etext - 1; 512 data_resource.start = (unsigned long) _etext; 513 data_resource.end = (unsigned long) _edata - 1; 514 bss_resource.start = (unsigned long) __bss_start; 515 bss_resource.end = (unsigned long) __bss_stop - 1; 516 517 for_each_memblock(memory, reg) { 518 res = memblock_alloc(sizeof(*res), 8); 519 if (!res) 520 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 521 __func__, sizeof(*res), 8); 522 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 523 524 res->name = "System RAM"; 525 res->start = reg->base; 526 res->end = reg->base + reg->size - 1; 527 request_resource(&iomem_resource, res); 528 529 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 530 std_res = standard_resources[j]; 531 if (std_res->start < res->start || 532 std_res->start > res->end) 533 continue; 534 if (std_res->end > res->end) { 535 sub_res = memblock_alloc(sizeof(*sub_res), 8); 536 if (!sub_res) 537 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 538 __func__, sizeof(*sub_res), 8); 539 *sub_res = *std_res; 540 sub_res->end = res->end; 541 std_res->start = res->end + 1; 542 request_resource(res, sub_res); 543 } else { 544 request_resource(res, std_res); 545 } 546 } 547 } 548 #ifdef CONFIG_CRASH_DUMP 549 /* 550 * Re-add removed crash kernel memory as reserved memory. This makes 551 * sure it will be mapped with the identity mapping and struct pages 552 * will be created, so it can be resized later on. 553 * However add it later since the crash kernel resource should not be 554 * part of the System RAM resource. 555 */ 556 if (crashk_res.end) { 557 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); 558 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 559 insert_resource(&iomem_resource, &crashk_res); 560 } 561 #endif 562 } 563 564 static void __init setup_memory_end(void) 565 { 566 unsigned long vmax, vmalloc_size, tmp; 567 568 /* Choose kernel address space layout: 3 or 4 levels. */ 569 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 570 if (IS_ENABLED(CONFIG_KASAN)) { 571 vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING) 572 ? _REGION1_SIZE 573 : _REGION2_SIZE; 574 } else { 575 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 576 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 577 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) 578 vmax = _REGION2_SIZE; /* 3-level kernel page table */ 579 else 580 vmax = _REGION1_SIZE; /* 4-level kernel page table */ 581 } 582 583 /* module area is at the end of the kernel address space. */ 584 MODULES_END = vmax; 585 MODULES_VADDR = MODULES_END - MODULES_LEN; 586 VMALLOC_END = MODULES_VADDR; 587 VMALLOC_START = VMALLOC_END - vmalloc_size; 588 589 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 590 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 591 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 592 tmp = SECTION_ALIGN_UP(tmp); 593 tmp = VMALLOC_START - tmp * sizeof(struct page); 594 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 595 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 596 vmemmap = (struct page *) tmp; 597 598 /* Take care that memory_end is set and <= vmemmap */ 599 memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap); 600 #ifdef CONFIG_KASAN 601 /* fit in kasan shadow memory region between 1:1 and vmemmap */ 602 memory_end = min(memory_end, KASAN_SHADOW_START); 603 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END); 604 #endif 605 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 606 memblock_remove(memory_end, ULONG_MAX); 607 608 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20); 609 } 610 611 #ifdef CONFIG_CRASH_DUMP 612 613 /* 614 * When kdump is enabled, we have to ensure that no memory from 615 * the area [0 - crashkernel memory size] and 616 * [crashk_res.start - crashk_res.end] is set offline. 617 */ 618 static int kdump_mem_notifier(struct notifier_block *nb, 619 unsigned long action, void *data) 620 { 621 struct memory_notify *arg = data; 622 623 if (action != MEM_GOING_OFFLINE) 624 return NOTIFY_OK; 625 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 626 return NOTIFY_BAD; 627 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 628 return NOTIFY_OK; 629 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 630 return NOTIFY_OK; 631 return NOTIFY_BAD; 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 behind memory_end is protected 642 */ 643 static void reserve_memory_end(void) 644 { 645 if (memory_end_set) 646 memblock_reserve(memory_end, ULONG_MAX); 647 } 648 649 /* 650 * Make sure that oldmem, where the dump is stored, is protected 651 */ 652 static void reserve_oldmem(void) 653 { 654 #ifdef CONFIG_CRASH_DUMP 655 if (OLDMEM_BASE) 656 /* Forget all memory above the running kdump system */ 657 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 658 #endif 659 } 660 661 /* 662 * Make sure that oldmem, where the dump is stored, is protected 663 */ 664 static void remove_oldmem(void) 665 { 666 #ifdef CONFIG_CRASH_DUMP 667 if (OLDMEM_BASE) 668 /* Forget all memory above the running kdump system */ 669 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 670 #endif 671 } 672 673 /* 674 * Reserve memory for kdump kernel to be loaded with kexec 675 */ 676 static void __init reserve_crashkernel(void) 677 { 678 #ifdef CONFIG_CRASH_DUMP 679 unsigned long long crash_base, crash_size; 680 phys_addr_t low, high; 681 int rc; 682 683 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 684 &crash_base); 685 686 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 687 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 688 if (rc || crash_size == 0) 689 return; 690 691 if (memblock.memory.regions[0].size < crash_size) { 692 pr_info("crashkernel reservation failed: %s\n", 693 "first memory chunk must be at least crashkernel size"); 694 return; 695 } 696 697 low = crash_base ?: OLDMEM_BASE; 698 high = low + crash_size; 699 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 700 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 701 crash_base = low; 702 } else { 703 /* Find suitable area in free memory */ 704 low = max_t(unsigned long, crash_size, sclp.hsa_size); 705 high = crash_base ? crash_base + crash_size : ULONG_MAX; 706 707 if (crash_base && crash_base < low) { 708 pr_info("crashkernel reservation failed: %s\n", 709 "crash_base too low"); 710 return; 711 } 712 low = crash_base ?: low; 713 crash_base = memblock_find_in_range(low, high, crash_size, 714 KEXEC_CRASH_MEM_ALIGN); 715 } 716 717 if (!crash_base) { 718 pr_info("crashkernel reservation failed: %s\n", 719 "no suitable area found"); 720 return; 721 } 722 723 if (register_memory_notifier(&kdump_mem_nb)) 724 return; 725 726 if (!OLDMEM_BASE && MACHINE_IS_VM) 727 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 728 crashk_res.start = crash_base; 729 crashk_res.end = crash_base + crash_size - 1; 730 memblock_remove(crash_base, crash_size); 731 pr_info("Reserving %lluMB of memory at %lluMB " 732 "for crashkernel (System RAM: %luMB)\n", 733 crash_size >> 20, crash_base >> 20, 734 (unsigned long)memblock.memory.total_size >> 20); 735 os_info_crashkernel_add(crash_base, crash_size); 736 #endif 737 } 738 739 /* 740 * Reserve the initrd from being used by memblock 741 */ 742 static void __init reserve_initrd(void) 743 { 744 #ifdef CONFIG_BLK_DEV_INITRD 745 if (!INITRD_START || !INITRD_SIZE) 746 return; 747 initrd_start = INITRD_START; 748 initrd_end = initrd_start + INITRD_SIZE; 749 memblock_reserve(INITRD_START, INITRD_SIZE); 750 #endif 751 } 752 753 /* 754 * Reserve the memory area used to pass the certificate lists 755 */ 756 static void __init reserve_certificate_list(void) 757 { 758 if (ipl_cert_list_addr) 759 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 760 } 761 762 static void __init reserve_mem_detect_info(void) 763 { 764 unsigned long start, size; 765 766 get_mem_detect_reserved(&start, &size); 767 if (size) 768 memblock_reserve(start, size); 769 } 770 771 static void __init free_mem_detect_info(void) 772 { 773 unsigned long start, size; 774 775 get_mem_detect_reserved(&start, &size); 776 if (size) 777 memblock_free(start, size); 778 } 779 780 static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size) 781 { 782 memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n", 783 start, start + size - 1); 784 memblock_add_range(&memblock.memory, start, size, 0, 0); 785 memblock_add_range(&memblock.physmem, start, size, 0, 0); 786 } 787 788 static const char * __init get_mem_info_source(void) 789 { 790 switch (mem_detect.info_source) { 791 case MEM_DETECT_SCLP_STOR_INFO: 792 return "sclp storage info"; 793 case MEM_DETECT_DIAG260: 794 return "diag260"; 795 case MEM_DETECT_SCLP_READ_INFO: 796 return "sclp read info"; 797 case MEM_DETECT_BIN_SEARCH: 798 return "binary search"; 799 } 800 return "none"; 801 } 802 803 static void __init memblock_add_mem_detect_info(void) 804 { 805 unsigned long start, end; 806 int i; 807 808 memblock_dbg("physmem info source: %s (%hhd)\n", 809 get_mem_info_source(), mem_detect.info_source); 810 /* keep memblock lists close to the kernel */ 811 memblock_set_bottom_up(true); 812 for_each_mem_detect_block(i, &start, &end) 813 memblock_physmem_add(start, end - start); 814 memblock_set_bottom_up(false); 815 memblock_dump_all(); 816 } 817 818 /* 819 * Check for initrd being in usable memory 820 */ 821 static void __init check_initrd(void) 822 { 823 #ifdef CONFIG_BLK_DEV_INITRD 824 if (INITRD_START && INITRD_SIZE && 825 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 826 pr_err("The initial RAM disk does not fit into the memory\n"); 827 memblock_free(INITRD_START, INITRD_SIZE); 828 initrd_start = initrd_end = 0; 829 } 830 #endif 831 } 832 833 /* 834 * Reserve memory used for lowcore/command line/kernel image. 835 */ 836 static void __init reserve_kernel(void) 837 { 838 unsigned long start_pfn = PFN_UP(__pa(_end)); 839 840 memblock_reserve(0, HEAD_END); 841 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 842 - (unsigned long)_stext); 843 memblock_reserve(__sdma, __edma - __sdma); 844 } 845 846 static void __init setup_memory(void) 847 { 848 struct memblock_region *reg; 849 850 /* 851 * Init storage key for present memory 852 */ 853 for_each_memblock(memory, reg) { 854 storage_key_init_range(reg->base, reg->base + reg->size); 855 } 856 psw_set_key(PAGE_DEFAULT_KEY); 857 858 /* Only cosmetics */ 859 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 860 } 861 862 /* 863 * Setup hardware capabilities. 864 */ 865 static int __init setup_hwcaps(void) 866 { 867 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 868 struct cpuid cpu_id; 869 int i; 870 871 /* 872 * The store facility list bits numbers as found in the principles 873 * of operation are numbered with bit 1UL<<31 as number 0 to 874 * bit 1UL<<0 as number 31. 875 * Bit 0: instructions named N3, "backported" to esa-mode 876 * Bit 2: z/Architecture mode is active 877 * Bit 7: the store-facility-list-extended facility is installed 878 * Bit 17: the message-security assist is installed 879 * Bit 19: the long-displacement facility is installed 880 * Bit 21: the extended-immediate facility is installed 881 * Bit 22: extended-translation facility 3 is installed 882 * Bit 30: extended-translation facility 3 enhancement facility 883 * These get translated to: 884 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 885 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 886 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 887 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 888 */ 889 for (i = 0; i < 6; i++) 890 if (test_facility(stfl_bits[i])) 891 elf_hwcap |= 1UL << i; 892 893 if (test_facility(22) && test_facility(30)) 894 elf_hwcap |= HWCAP_S390_ETF3EH; 895 896 /* 897 * Check for additional facilities with store-facility-list-extended. 898 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 899 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 900 * as stored by stfl, bits 32-xxx contain additional facilities. 901 * How many facility words are stored depends on the number of 902 * doublewords passed to the instruction. The additional facilities 903 * are: 904 * Bit 42: decimal floating point facility is installed 905 * Bit 44: perform floating point operation facility is installed 906 * translated to: 907 * HWCAP_S390_DFP bit 6 (42 && 44). 908 */ 909 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 910 elf_hwcap |= HWCAP_S390_DFP; 911 912 /* 913 * Huge page support HWCAP_S390_HPAGE is bit 7. 914 */ 915 if (MACHINE_HAS_EDAT1) 916 elf_hwcap |= HWCAP_S390_HPAGE; 917 918 /* 919 * 64-bit register support for 31-bit processes 920 * HWCAP_S390_HIGH_GPRS is bit 9. 921 */ 922 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 923 924 /* 925 * Transactional execution support HWCAP_S390_TE is bit 10. 926 */ 927 if (MACHINE_HAS_TE) 928 elf_hwcap |= HWCAP_S390_TE; 929 930 /* 931 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 932 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 933 * instead of facility bit 129. 934 */ 935 if (MACHINE_HAS_VX) { 936 elf_hwcap |= HWCAP_S390_VXRS; 937 if (test_facility(134)) 938 elf_hwcap |= HWCAP_S390_VXRS_EXT; 939 if (test_facility(135)) 940 elf_hwcap |= HWCAP_S390_VXRS_BCD; 941 if (test_facility(148)) 942 elf_hwcap |= HWCAP_S390_VXRS_EXT2; 943 if (test_facility(152)) 944 elf_hwcap |= HWCAP_S390_VXRS_PDE; 945 } 946 if (test_facility(150)) 947 elf_hwcap |= HWCAP_S390_SORT; 948 if (test_facility(151)) 949 elf_hwcap |= HWCAP_S390_DFLT; 950 951 /* 952 * Guarded storage support HWCAP_S390_GS is bit 12. 953 */ 954 if (MACHINE_HAS_GS) 955 elf_hwcap |= HWCAP_S390_GS; 956 957 get_cpu_id(&cpu_id); 958 add_device_randomness(&cpu_id, sizeof(cpu_id)); 959 switch (cpu_id.machine) { 960 case 0x2064: 961 case 0x2066: 962 default: /* Use "z900" as default for 64 bit kernels. */ 963 strcpy(elf_platform, "z900"); 964 break; 965 case 0x2084: 966 case 0x2086: 967 strcpy(elf_platform, "z990"); 968 break; 969 case 0x2094: 970 case 0x2096: 971 strcpy(elf_platform, "z9-109"); 972 break; 973 case 0x2097: 974 case 0x2098: 975 strcpy(elf_platform, "z10"); 976 break; 977 case 0x2817: 978 case 0x2818: 979 strcpy(elf_platform, "z196"); 980 break; 981 case 0x2827: 982 case 0x2828: 983 strcpy(elf_platform, "zEC12"); 984 break; 985 case 0x2964: 986 case 0x2965: 987 strcpy(elf_platform, "z13"); 988 break; 989 case 0x3906: 990 case 0x3907: 991 strcpy(elf_platform, "z14"); 992 break; 993 } 994 995 /* 996 * Virtualization support HWCAP_INT_SIE is bit 0. 997 */ 998 if (sclp.has_sief2) 999 int_hwcap |= HWCAP_INT_SIE; 1000 1001 return 0; 1002 } 1003 arch_initcall(setup_hwcaps); 1004 1005 /* 1006 * Add system information as device randomness 1007 */ 1008 static void __init setup_randomness(void) 1009 { 1010 struct sysinfo_3_2_2 *vmms; 1011 1012 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE, 1013 PAGE_SIZE); 1014 if (!vmms) 1015 panic("Failed to allocate memory for sysinfo structure\n"); 1016 1017 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 1018 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 1019 memblock_free((unsigned long) vmms, PAGE_SIZE); 1020 } 1021 1022 /* 1023 * Find the correct size for the task_struct. This depends on 1024 * the size of the struct fpu at the end of the thread_struct 1025 * which is embedded in the task_struct. 1026 */ 1027 static void __init setup_task_size(void) 1028 { 1029 int task_size = sizeof(struct task_struct); 1030 1031 if (!MACHINE_HAS_VX) { 1032 task_size -= sizeof(__vector128) * __NUM_VXRS; 1033 task_size += sizeof(freg_t) * __NUM_FPRS; 1034 } 1035 arch_task_struct_size = task_size; 1036 } 1037 1038 /* 1039 * Issue diagnose 318 to set the control program name and 1040 * version codes. 1041 */ 1042 static void __init setup_control_program_code(void) 1043 { 1044 union diag318_info diag318_info = { 1045 .cpnc = CPNC_LINUX, 1046 .cpvc_linux = 0, 1047 .cpvc_distro = {0}, 1048 }; 1049 1050 if (!sclp.has_diag318) 1051 return; 1052 1053 diag_stat_inc(DIAG_STAT_X318); 1054 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 1055 } 1056 1057 /* 1058 * Print the component list from the IPL report 1059 */ 1060 static void __init log_component_list(void) 1061 { 1062 struct ipl_rb_component_entry *ptr, *end; 1063 char *str; 1064 1065 if (!early_ipl_comp_list_addr) 1066 return; 1067 if (ipl_block.hdr.flags & IPL_PL_FLAG_IPLSR) 1068 pr_info("Linux is running with Secure-IPL enabled\n"); 1069 else 1070 pr_info("Linux is running with Secure-IPL disabled\n"); 1071 ptr = (void *) early_ipl_comp_list_addr; 1072 end = (void *) ptr + early_ipl_comp_list_size; 1073 pr_info("The IPL report contains the following components:\n"); 1074 while (ptr < end) { 1075 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 1076 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 1077 str = "signed, verified"; 1078 else 1079 str = "signed, verification failed"; 1080 } else { 1081 str = "not signed"; 1082 } 1083 pr_info("%016llx - %016llx (%s)\n", 1084 ptr->addr, ptr->addr + ptr->len, str); 1085 ptr++; 1086 } 1087 } 1088 1089 /* 1090 * Setup function called from init/main.c just after the banner 1091 * was printed. 1092 */ 1093 1094 void __init setup_arch(char **cmdline_p) 1095 { 1096 /* 1097 * print what head.S has found out about the machine 1098 */ 1099 if (MACHINE_IS_VM) 1100 pr_info("Linux is running as a z/VM " 1101 "guest operating system in 64-bit mode\n"); 1102 else if (MACHINE_IS_KVM) 1103 pr_info("Linux is running under KVM in 64-bit mode\n"); 1104 else if (MACHINE_IS_LPAR) 1105 pr_info("Linux is running natively in 64-bit mode\n"); 1106 else 1107 pr_info("Linux is running as a guest in 64-bit mode\n"); 1108 1109 log_component_list(); 1110 1111 /* Have one command line that is parsed and saved in /proc/cmdline */ 1112 /* boot_command_line has been already set up in early.c */ 1113 *cmdline_p = boot_command_line; 1114 1115 ROOT_DEV = Root_RAM0; 1116 1117 /* Is init_mm really needed? */ 1118 init_mm.start_code = PAGE_OFFSET; 1119 init_mm.end_code = (unsigned long) _etext; 1120 init_mm.end_data = (unsigned long) _edata; 1121 init_mm.brk = (unsigned long) _end; 1122 1123 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 1124 nospec_auto_detect(); 1125 1126 parse_early_param(); 1127 #ifdef CONFIG_CRASH_DUMP 1128 /* Deactivate elfcorehdr= kernel parameter */ 1129 elfcorehdr_addr = ELFCORE_ADDR_MAX; 1130 #endif 1131 1132 os_info_init(); 1133 setup_ipl(); 1134 setup_task_size(); 1135 setup_control_program_code(); 1136 1137 /* Do some memory reservations *before* memory is added to memblock */ 1138 reserve_memory_end(); 1139 reserve_oldmem(); 1140 reserve_kernel(); 1141 reserve_initrd(); 1142 reserve_certificate_list(); 1143 reserve_mem_detect_info(); 1144 memblock_allow_resize(); 1145 1146 /* Get information about *all* installed memory */ 1147 memblock_add_mem_detect_info(); 1148 1149 free_mem_detect_info(); 1150 remove_oldmem(); 1151 1152 /* 1153 * Make sure all chunks are MAX_ORDER aligned so we don't need the 1154 * extra checks that HOLES_IN_ZONE would require. 1155 * 1156 * Is this still required? 1157 */ 1158 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 1159 1160 setup_memory_end(); 1161 setup_memory(); 1162 dma_contiguous_reserve(memory_end); 1163 vmcp_cma_reserve(); 1164 1165 check_initrd(); 1166 reserve_crashkernel(); 1167 #ifdef CONFIG_CRASH_DUMP 1168 /* 1169 * Be aware that smp_save_dump_cpus() triggers a system reset. 1170 * Therefore CPU and device initialization should be done afterwards. 1171 */ 1172 smp_save_dump_cpus(); 1173 #endif 1174 1175 setup_resources(); 1176 setup_lowcore_dat_off(); 1177 smp_fill_possible_mask(); 1178 cpu_detect_mhz_feature(); 1179 cpu_init(); 1180 numa_setup(); 1181 smp_detect_cpus(); 1182 topology_init_early(); 1183 1184 /* 1185 * Create kernel page tables and switch to virtual addressing. 1186 */ 1187 paging_init(); 1188 1189 /* 1190 * After paging_init created the kernel page table, the new PSWs 1191 * in lowcore can now run with DAT enabled. 1192 */ 1193 setup_lowcore_dat_on(); 1194 1195 /* Setup default console */ 1196 conmode_default(); 1197 set_preferred_console(); 1198 1199 apply_alternative_instructions(); 1200 if (IS_ENABLED(CONFIG_EXPOLINE)) 1201 nospec_init_branches(); 1202 1203 /* Setup zfcpdump support */ 1204 setup_zfcpdump(); 1205 1206 /* Add system specific data to the random pool */ 1207 setup_randomness(); 1208 } 1209