1 /* 2 * S390 version 3 * Copyright IBM Corp. 1999, 2012 4 * Author(s): Hartmut Penner (hp@de.ibm.com), 5 * Martin Schwidefsky (schwidefsky@de.ibm.com) 6 * 7 * Derived from "arch/i386/kernel/setup.c" 8 * Copyright (C) 1995, Linus Torvalds 9 */ 10 11 /* 12 * This file handles the architecture-dependent parts of initialization 13 */ 14 15 #define KMSG_COMPONENT "setup" 16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 17 18 #include <linux/errno.h> 19 #include <linux/export.h> 20 #include <linux/sched.h> 21 #include <linux/sched/task.h> 22 #include <linux/cpu.h> 23 #include <linux/kernel.h> 24 #include <linux/memblock.h> 25 #include <linux/mm.h> 26 #include <linux/stddef.h> 27 #include <linux/unistd.h> 28 #include <linux/ptrace.h> 29 #include <linux/random.h> 30 #include <linux/user.h> 31 #include <linux/tty.h> 32 #include <linux/ioport.h> 33 #include <linux/delay.h> 34 #include <linux/init.h> 35 #include <linux/initrd.h> 36 #include <linux/bootmem.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 52 #include <asm/ipl.h> 53 #include <asm/facility.h> 54 #include <asm/smp.h> 55 #include <asm/mmu_context.h> 56 #include <asm/cpcmd.h> 57 #include <asm/lowcore.h> 58 #include <asm/nmi.h> 59 #include <asm/irq.h> 60 #include <asm/page.h> 61 #include <asm/ptrace.h> 62 #include <asm/sections.h> 63 #include <asm/ebcdic.h> 64 #include <asm/diag.h> 65 #include <asm/os_info.h> 66 #include <asm/sclp.h> 67 #include <asm/sysinfo.h> 68 #include <asm/numa.h> 69 #include <asm/alternative.h> 70 #include "entry.h" 71 72 /* 73 * Machine setup.. 74 */ 75 unsigned int console_mode = 0; 76 EXPORT_SYMBOL(console_mode); 77 78 unsigned int console_devno = -1; 79 EXPORT_SYMBOL(console_devno); 80 81 unsigned int console_irq = -1; 82 EXPORT_SYMBOL(console_irq); 83 84 unsigned long elf_hwcap __read_mostly = 0; 85 char elf_platform[ELF_PLATFORM_SIZE]; 86 87 unsigned long int_hwcap = 0; 88 89 int __initdata memory_end_set; 90 unsigned long __initdata memory_end; 91 unsigned long __initdata max_physmem_end; 92 93 unsigned long VMALLOC_START; 94 EXPORT_SYMBOL(VMALLOC_START); 95 96 unsigned long VMALLOC_END; 97 EXPORT_SYMBOL(VMALLOC_END); 98 99 struct page *vmemmap; 100 EXPORT_SYMBOL(vmemmap); 101 102 unsigned long MODULES_VADDR; 103 unsigned long MODULES_END; 104 105 /* An array with a pointer to the lowcore of every CPU. */ 106 struct lowcore *lowcore_ptr[NR_CPUS]; 107 EXPORT_SYMBOL(lowcore_ptr); 108 109 /* 110 * This is set up by the setup-routine at boot-time 111 * for S390 need to find out, what we have to setup 112 * using address 0x10400 ... 113 */ 114 115 #include <asm/setup.h> 116 117 /* 118 * condev= and conmode= setup parameter. 119 */ 120 121 static int __init condev_setup(char *str) 122 { 123 int vdev; 124 125 vdev = simple_strtoul(str, &str, 0); 126 if (vdev >= 0 && vdev < 65536) { 127 console_devno = vdev; 128 console_irq = -1; 129 } 130 return 1; 131 } 132 133 __setup("condev=", condev_setup); 134 135 static void __init set_preferred_console(void) 136 { 137 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 138 add_preferred_console("ttyS", 0, NULL); 139 else if (CONSOLE_IS_3270) 140 add_preferred_console("tty3270", 0, NULL); 141 else if (CONSOLE_IS_VT220) 142 add_preferred_console("ttyS", 1, NULL); 143 else if (CONSOLE_IS_HVC) 144 add_preferred_console("hvc", 0, NULL); 145 } 146 147 static int __init conmode_setup(char *str) 148 { 149 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 150 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 151 SET_CONSOLE_SCLP; 152 #endif 153 #if defined(CONFIG_TN3215_CONSOLE) 154 if (strncmp(str, "3215", 5) == 0) 155 SET_CONSOLE_3215; 156 #endif 157 #if defined(CONFIG_TN3270_CONSOLE) 158 if (strncmp(str, "3270", 5) == 0) 159 SET_CONSOLE_3270; 160 #endif 161 set_preferred_console(); 162 return 1; 163 } 164 165 __setup("conmode=", conmode_setup); 166 167 static void __init conmode_default(void) 168 { 169 char query_buffer[1024]; 170 char *ptr; 171 172 if (MACHINE_IS_VM) { 173 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 174 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 175 ptr = strstr(query_buffer, "SUBCHANNEL ="); 176 console_irq = simple_strtoul(ptr + 13, NULL, 16); 177 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 178 ptr = strstr(query_buffer, "CONMODE"); 179 /* 180 * Set the conmode to 3215 so that the device recognition 181 * will set the cu_type of the console to 3215. If the 182 * conmode is 3270 and we don't set it back then both 183 * 3215 and the 3270 driver will try to access the console 184 * device (3215 as console and 3270 as normal tty). 185 */ 186 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 187 if (ptr == NULL) { 188 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 189 SET_CONSOLE_SCLP; 190 #endif 191 return; 192 } 193 if (strncmp(ptr + 8, "3270", 4) == 0) { 194 #if defined(CONFIG_TN3270_CONSOLE) 195 SET_CONSOLE_3270; 196 #elif defined(CONFIG_TN3215_CONSOLE) 197 SET_CONSOLE_3215; 198 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 199 SET_CONSOLE_SCLP; 200 #endif 201 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 202 #if defined(CONFIG_TN3215_CONSOLE) 203 SET_CONSOLE_3215; 204 #elif defined(CONFIG_TN3270_CONSOLE) 205 SET_CONSOLE_3270; 206 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 207 SET_CONSOLE_SCLP; 208 #endif 209 } 210 } else if (MACHINE_IS_KVM) { 211 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 212 SET_CONSOLE_VT220; 213 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 214 SET_CONSOLE_SCLP; 215 else 216 SET_CONSOLE_HVC; 217 } else { 218 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 219 SET_CONSOLE_SCLP; 220 #endif 221 } 222 } 223 224 #ifdef CONFIG_CRASH_DUMP 225 static void __init setup_zfcpdump(void) 226 { 227 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 228 return; 229 if (OLDMEM_BASE) 230 return; 231 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 232 console_loglevel = 2; 233 } 234 #else 235 static inline void setup_zfcpdump(void) {} 236 #endif /* CONFIG_CRASH_DUMP */ 237 238 /* 239 * Reboot, halt and power_off stubs. They just call _machine_restart, 240 * _machine_halt or _machine_power_off. 241 */ 242 243 void machine_restart(char *command) 244 { 245 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 246 /* 247 * Only unblank the console if we are called in enabled 248 * context or a bust_spinlocks cleared the way for us. 249 */ 250 console_unblank(); 251 _machine_restart(command); 252 } 253 254 void machine_halt(void) 255 { 256 if (!in_interrupt() || oops_in_progress) 257 /* 258 * Only unblank the console if we are called in enabled 259 * context or a bust_spinlocks cleared the way for us. 260 */ 261 console_unblank(); 262 _machine_halt(); 263 } 264 265 void machine_power_off(void) 266 { 267 if (!in_interrupt() || oops_in_progress) 268 /* 269 * Only unblank the console if we are called in enabled 270 * context or a bust_spinlocks cleared the way for us. 271 */ 272 console_unblank(); 273 _machine_power_off(); 274 } 275 276 /* 277 * Dummy power off function. 278 */ 279 void (*pm_power_off)(void) = machine_power_off; 280 EXPORT_SYMBOL_GPL(pm_power_off); 281 282 static int __init early_parse_mem(char *p) 283 { 284 memory_end = memparse(p, &p); 285 memory_end &= PAGE_MASK; 286 memory_end_set = 1; 287 return 0; 288 } 289 early_param("mem", early_parse_mem); 290 291 static int __init parse_vmalloc(char *arg) 292 { 293 if (!arg) 294 return -EINVAL; 295 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 296 return 0; 297 } 298 early_param("vmalloc", parse_vmalloc); 299 300 void *restart_stack __section(.data); 301 302 static void __init setup_lowcore(void) 303 { 304 struct lowcore *lc; 305 306 /* 307 * Setup lowcore for boot cpu 308 */ 309 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 310 lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc)); 311 lc->restart_psw.mask = PSW_KERNEL_BITS; 312 lc->restart_psw.addr = (unsigned long) restart_int_handler; 313 lc->external_new_psw.mask = PSW_KERNEL_BITS | 314 PSW_MASK_DAT | PSW_MASK_MCHECK; 315 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 316 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 317 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 318 lc->svc_new_psw.addr = (unsigned long) system_call; 319 lc->program_new_psw.mask = PSW_KERNEL_BITS | 320 PSW_MASK_DAT | PSW_MASK_MCHECK; 321 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 322 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 323 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 324 lc->io_new_psw.mask = PSW_KERNEL_BITS | 325 PSW_MASK_DAT | PSW_MASK_MCHECK; 326 lc->io_new_psw.addr = (unsigned long) io_int_handler; 327 lc->clock_comparator = clock_comparator_max; 328 lc->kernel_stack = ((unsigned long) &init_thread_union) 329 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 330 lc->async_stack = (unsigned long) 331 memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE) 332 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 333 lc->panic_stack = (unsigned long) 334 memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE) 335 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 336 lc->current_task = (unsigned long)&init_task; 337 lc->lpp = LPP_MAGIC; 338 lc->machine_flags = S390_lowcore.machine_flags; 339 lc->preempt_count = S390_lowcore.preempt_count; 340 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 341 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 342 MAX_FACILITY_BIT/8); 343 nmi_alloc_boot_cpu(lc); 344 vdso_alloc_boot_cpu(lc); 345 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 346 lc->async_enter_timer = S390_lowcore.async_enter_timer; 347 lc->exit_timer = S390_lowcore.exit_timer; 348 lc->user_timer = S390_lowcore.user_timer; 349 lc->system_timer = S390_lowcore.system_timer; 350 lc->steal_timer = S390_lowcore.steal_timer; 351 lc->last_update_timer = S390_lowcore.last_update_timer; 352 lc->last_update_clock = S390_lowcore.last_update_clock; 353 354 restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE); 355 restart_stack += ASYNC_SIZE; 356 357 /* 358 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 359 * restart data to the absolute zero lowcore. This is necessary if 360 * PSW restart is done on an offline CPU that has lowcore zero. 361 */ 362 lc->restart_stack = (unsigned long) restart_stack; 363 lc->restart_fn = (unsigned long) do_restart; 364 lc->restart_data = 0; 365 lc->restart_source = -1UL; 366 367 /* Setup absolute zero lowcore */ 368 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 369 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 370 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 371 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 372 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 373 374 #ifdef CONFIG_SMP 375 lc->spinlock_lockval = arch_spin_lockval(0); 376 lc->spinlock_index = 0; 377 arch_spin_lock_setup(0); 378 #endif 379 380 set_prefix((u32)(unsigned long) lc); 381 lowcore_ptr[0] = lc; 382 } 383 384 static struct resource code_resource = { 385 .name = "Kernel code", 386 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 387 }; 388 389 static struct resource data_resource = { 390 .name = "Kernel data", 391 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 392 }; 393 394 static struct resource bss_resource = { 395 .name = "Kernel bss", 396 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 397 }; 398 399 static struct resource __initdata *standard_resources[] = { 400 &code_resource, 401 &data_resource, 402 &bss_resource, 403 }; 404 405 static void __init setup_resources(void) 406 { 407 struct resource *res, *std_res, *sub_res; 408 struct memblock_region *reg; 409 int j; 410 411 code_resource.start = (unsigned long) &_text; 412 code_resource.end = (unsigned long) &_etext - 1; 413 data_resource.start = (unsigned long) &_etext; 414 data_resource.end = (unsigned long) &_edata - 1; 415 bss_resource.start = (unsigned long) &__bss_start; 416 bss_resource.end = (unsigned long) &__bss_stop - 1; 417 418 for_each_memblock(memory, reg) { 419 res = memblock_virt_alloc(sizeof(*res), 8); 420 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 421 422 res->name = "System RAM"; 423 res->start = reg->base; 424 res->end = reg->base + reg->size - 1; 425 request_resource(&iomem_resource, res); 426 427 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 428 std_res = standard_resources[j]; 429 if (std_res->start < res->start || 430 std_res->start > res->end) 431 continue; 432 if (std_res->end > res->end) { 433 sub_res = memblock_virt_alloc(sizeof(*sub_res), 8); 434 *sub_res = *std_res; 435 sub_res->end = res->end; 436 std_res->start = res->end + 1; 437 request_resource(res, sub_res); 438 } else { 439 request_resource(res, std_res); 440 } 441 } 442 } 443 #ifdef CONFIG_CRASH_DUMP 444 /* 445 * Re-add removed crash kernel memory as reserved memory. This makes 446 * sure it will be mapped with the identity mapping and struct pages 447 * will be created, so it can be resized later on. 448 * However add it later since the crash kernel resource should not be 449 * part of the System RAM resource. 450 */ 451 if (crashk_res.end) { 452 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); 453 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 454 insert_resource(&iomem_resource, &crashk_res); 455 } 456 #endif 457 } 458 459 static void __init setup_memory_end(void) 460 { 461 unsigned long vmax, vmalloc_size, tmp; 462 463 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 464 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 465 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 466 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 467 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) 468 vmax = _REGION2_SIZE; /* 3-level kernel page table */ 469 else 470 vmax = _REGION1_SIZE; /* 4-level kernel page table */ 471 /* module area is at the end of the kernel address space. */ 472 MODULES_END = vmax; 473 MODULES_VADDR = MODULES_END - MODULES_LEN; 474 VMALLOC_END = MODULES_VADDR; 475 VMALLOC_START = vmax - vmalloc_size; 476 477 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 478 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 479 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 480 tmp = SECTION_ALIGN_UP(tmp); 481 tmp = VMALLOC_START - tmp * sizeof(struct page); 482 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 483 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 484 vmemmap = (struct page *) tmp; 485 486 /* Take care that memory_end is set and <= vmemmap */ 487 memory_end = min(memory_end ?: max_physmem_end, tmp); 488 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 489 memblock_remove(memory_end, ULONG_MAX); 490 491 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20); 492 } 493 494 #ifdef CONFIG_CRASH_DUMP 495 496 /* 497 * When kdump is enabled, we have to ensure that no memory from 498 * the area [0 - crashkernel memory size] and 499 * [crashk_res.start - crashk_res.end] is set offline. 500 */ 501 static int kdump_mem_notifier(struct notifier_block *nb, 502 unsigned long action, void *data) 503 { 504 struct memory_notify *arg = data; 505 506 if (action != MEM_GOING_OFFLINE) 507 return NOTIFY_OK; 508 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 509 return NOTIFY_BAD; 510 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 511 return NOTIFY_OK; 512 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 513 return NOTIFY_OK; 514 return NOTIFY_BAD; 515 } 516 517 static struct notifier_block kdump_mem_nb = { 518 .notifier_call = kdump_mem_notifier, 519 }; 520 521 #endif 522 523 /* 524 * Make sure that the area behind memory_end is protected 525 */ 526 static void reserve_memory_end(void) 527 { 528 #ifdef CONFIG_CRASH_DUMP 529 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 530 !OLDMEM_BASE && sclp.hsa_size) { 531 memory_end = sclp.hsa_size; 532 memory_end &= PAGE_MASK; 533 memory_end_set = 1; 534 } 535 #endif 536 if (!memory_end_set) 537 return; 538 memblock_reserve(memory_end, ULONG_MAX); 539 } 540 541 /* 542 * Make sure that oldmem, where the dump is stored, is protected 543 */ 544 static void reserve_oldmem(void) 545 { 546 #ifdef CONFIG_CRASH_DUMP 547 if (OLDMEM_BASE) 548 /* Forget all memory above the running kdump system */ 549 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 550 #endif 551 } 552 553 /* 554 * Make sure that oldmem, where the dump is stored, is protected 555 */ 556 static void remove_oldmem(void) 557 { 558 #ifdef CONFIG_CRASH_DUMP 559 if (OLDMEM_BASE) 560 /* Forget all memory above the running kdump system */ 561 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 562 #endif 563 } 564 565 /* 566 * Reserve memory for kdump kernel to be loaded with kexec 567 */ 568 static void __init reserve_crashkernel(void) 569 { 570 #ifdef CONFIG_CRASH_DUMP 571 unsigned long long crash_base, crash_size; 572 phys_addr_t low, high; 573 int rc; 574 575 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 576 &crash_base); 577 578 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 579 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 580 if (rc || crash_size == 0) 581 return; 582 583 if (memblock.memory.regions[0].size < crash_size) { 584 pr_info("crashkernel reservation failed: %s\n", 585 "first memory chunk must be at least crashkernel size"); 586 return; 587 } 588 589 low = crash_base ?: OLDMEM_BASE; 590 high = low + crash_size; 591 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 592 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 593 crash_base = low; 594 } else { 595 /* Find suitable area in free memory */ 596 low = max_t(unsigned long, crash_size, sclp.hsa_size); 597 high = crash_base ? crash_base + crash_size : ULONG_MAX; 598 599 if (crash_base && crash_base < low) { 600 pr_info("crashkernel reservation failed: %s\n", 601 "crash_base too low"); 602 return; 603 } 604 low = crash_base ?: low; 605 crash_base = memblock_find_in_range(low, high, crash_size, 606 KEXEC_CRASH_MEM_ALIGN); 607 } 608 609 if (!crash_base) { 610 pr_info("crashkernel reservation failed: %s\n", 611 "no suitable area found"); 612 return; 613 } 614 615 if (register_memory_notifier(&kdump_mem_nb)) 616 return; 617 618 if (!OLDMEM_BASE && MACHINE_IS_VM) 619 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 620 crashk_res.start = crash_base; 621 crashk_res.end = crash_base + crash_size - 1; 622 memblock_remove(crash_base, crash_size); 623 pr_info("Reserving %lluMB of memory at %lluMB " 624 "for crashkernel (System RAM: %luMB)\n", 625 crash_size >> 20, crash_base >> 20, 626 (unsigned long)memblock.memory.total_size >> 20); 627 os_info_crashkernel_add(crash_base, crash_size); 628 #endif 629 } 630 631 /* 632 * Reserve the initrd from being used by memblock 633 */ 634 static void __init reserve_initrd(void) 635 { 636 #ifdef CONFIG_BLK_DEV_INITRD 637 if (!INITRD_START || !INITRD_SIZE) 638 return; 639 initrd_start = INITRD_START; 640 initrd_end = initrd_start + INITRD_SIZE; 641 memblock_reserve(INITRD_START, INITRD_SIZE); 642 #endif 643 } 644 645 /* 646 * Check for initrd being in usable memory 647 */ 648 static void __init check_initrd(void) 649 { 650 #ifdef CONFIG_BLK_DEV_INITRD 651 if (INITRD_START && INITRD_SIZE && 652 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 653 pr_err("The initial RAM disk does not fit into the memory\n"); 654 memblock_free(INITRD_START, INITRD_SIZE); 655 initrd_start = initrd_end = 0; 656 } 657 #endif 658 } 659 660 /* 661 * Reserve memory used for lowcore/command line/kernel image. 662 */ 663 static void __init reserve_kernel(void) 664 { 665 unsigned long start_pfn = PFN_UP(__pa(&_end)); 666 667 #ifdef CONFIG_DMA_API_DEBUG 668 /* 669 * DMA_API_DEBUG code stumbles over addresses from the 670 * range [_ehead, _stext]. Mark the memory as reserved 671 * so it is not used for CONFIG_DMA_API_DEBUG=y. 672 */ 673 memblock_reserve(0, PFN_PHYS(start_pfn)); 674 #else 675 memblock_reserve(0, (unsigned long)_ehead); 676 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 677 - (unsigned long)_stext); 678 #endif 679 } 680 681 static void __init setup_memory(void) 682 { 683 struct memblock_region *reg; 684 685 /* 686 * Init storage key for present memory 687 */ 688 for_each_memblock(memory, reg) { 689 storage_key_init_range(reg->base, reg->base + reg->size); 690 } 691 psw_set_key(PAGE_DEFAULT_KEY); 692 693 /* Only cosmetics */ 694 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 695 } 696 697 /* 698 * Setup hardware capabilities. 699 */ 700 static int __init setup_hwcaps(void) 701 { 702 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 703 struct cpuid cpu_id; 704 int i; 705 706 /* 707 * The store facility list bits numbers as found in the principles 708 * of operation are numbered with bit 1UL<<31 as number 0 to 709 * bit 1UL<<0 as number 31. 710 * Bit 0: instructions named N3, "backported" to esa-mode 711 * Bit 2: z/Architecture mode is active 712 * Bit 7: the store-facility-list-extended facility is installed 713 * Bit 17: the message-security assist is installed 714 * Bit 19: the long-displacement facility is installed 715 * Bit 21: the extended-immediate facility is installed 716 * Bit 22: extended-translation facility 3 is installed 717 * Bit 30: extended-translation facility 3 enhancement facility 718 * These get translated to: 719 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 720 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 721 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 722 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 723 */ 724 for (i = 0; i < 6; i++) 725 if (test_facility(stfl_bits[i])) 726 elf_hwcap |= 1UL << i; 727 728 if (test_facility(22) && test_facility(30)) 729 elf_hwcap |= HWCAP_S390_ETF3EH; 730 731 /* 732 * Check for additional facilities with store-facility-list-extended. 733 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 734 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 735 * as stored by stfl, bits 32-xxx contain additional facilities. 736 * How many facility words are stored depends on the number of 737 * doublewords passed to the instruction. The additional facilities 738 * are: 739 * Bit 42: decimal floating point facility is installed 740 * Bit 44: perform floating point operation facility is installed 741 * translated to: 742 * HWCAP_S390_DFP bit 6 (42 && 44). 743 */ 744 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 745 elf_hwcap |= HWCAP_S390_DFP; 746 747 /* 748 * Huge page support HWCAP_S390_HPAGE is bit 7. 749 */ 750 if (MACHINE_HAS_EDAT1) 751 elf_hwcap |= HWCAP_S390_HPAGE; 752 753 /* 754 * 64-bit register support for 31-bit processes 755 * HWCAP_S390_HIGH_GPRS is bit 9. 756 */ 757 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 758 759 /* 760 * Transactional execution support HWCAP_S390_TE is bit 10. 761 */ 762 if (MACHINE_HAS_TE) 763 elf_hwcap |= HWCAP_S390_TE; 764 765 /* 766 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 767 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 768 * instead of facility bit 129. 769 */ 770 if (MACHINE_HAS_VX) { 771 elf_hwcap |= HWCAP_S390_VXRS; 772 if (test_facility(134)) 773 elf_hwcap |= HWCAP_S390_VXRS_EXT; 774 if (test_facility(135)) 775 elf_hwcap |= HWCAP_S390_VXRS_BCD; 776 } 777 778 /* 779 * Guarded storage support HWCAP_S390_GS is bit 12. 780 */ 781 if (MACHINE_HAS_GS) 782 elf_hwcap |= HWCAP_S390_GS; 783 784 get_cpu_id(&cpu_id); 785 add_device_randomness(&cpu_id, sizeof(cpu_id)); 786 switch (cpu_id.machine) { 787 case 0x2064: 788 case 0x2066: 789 default: /* Use "z900" as default for 64 bit kernels. */ 790 strcpy(elf_platform, "z900"); 791 break; 792 case 0x2084: 793 case 0x2086: 794 strcpy(elf_platform, "z990"); 795 break; 796 case 0x2094: 797 case 0x2096: 798 strcpy(elf_platform, "z9-109"); 799 break; 800 case 0x2097: 801 case 0x2098: 802 strcpy(elf_platform, "z10"); 803 break; 804 case 0x2817: 805 case 0x2818: 806 strcpy(elf_platform, "z196"); 807 break; 808 case 0x2827: 809 case 0x2828: 810 strcpy(elf_platform, "zEC12"); 811 break; 812 case 0x2964: 813 case 0x2965: 814 strcpy(elf_platform, "z13"); 815 break; 816 case 0x3906: 817 strcpy(elf_platform, "z14"); 818 break; 819 } 820 821 /* 822 * Virtualization support HWCAP_INT_SIE is bit 0. 823 */ 824 if (sclp.has_sief2) 825 int_hwcap |= HWCAP_INT_SIE; 826 827 return 0; 828 } 829 arch_initcall(setup_hwcaps); 830 831 /* 832 * Add system information as device randomness 833 */ 834 static void __init setup_randomness(void) 835 { 836 struct sysinfo_3_2_2 *vmms; 837 838 vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE); 839 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 840 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 841 memblock_free((unsigned long) vmms, PAGE_SIZE); 842 } 843 844 /* 845 * Find the correct size for the task_struct. This depends on 846 * the size of the struct fpu at the end of the thread_struct 847 * which is embedded in the task_struct. 848 */ 849 static void __init setup_task_size(void) 850 { 851 int task_size = sizeof(struct task_struct); 852 853 if (!MACHINE_HAS_VX) { 854 task_size -= sizeof(__vector128) * __NUM_VXRS; 855 task_size += sizeof(freg_t) * __NUM_FPRS; 856 } 857 arch_task_struct_size = task_size; 858 } 859 860 /* 861 * Setup function called from init/main.c just after the banner 862 * was printed. 863 */ 864 865 void __init setup_arch(char **cmdline_p) 866 { 867 /* 868 * print what head.S has found out about the machine 869 */ 870 if (MACHINE_IS_VM) 871 pr_info("Linux is running as a z/VM " 872 "guest operating system in 64-bit mode\n"); 873 else if (MACHINE_IS_KVM) 874 pr_info("Linux is running under KVM in 64-bit mode\n"); 875 else if (MACHINE_IS_LPAR) 876 pr_info("Linux is running natively in 64-bit mode\n"); 877 878 /* Have one command line that is parsed and saved in /proc/cmdline */ 879 /* boot_command_line has been already set up in early.c */ 880 *cmdline_p = boot_command_line; 881 882 ROOT_DEV = Root_RAM0; 883 884 /* Is init_mm really needed? */ 885 init_mm.start_code = PAGE_OFFSET; 886 init_mm.end_code = (unsigned long) &_etext; 887 init_mm.end_data = (unsigned long) &_edata; 888 init_mm.brk = (unsigned long) &_end; 889 890 parse_early_param(); 891 #ifdef CONFIG_CRASH_DUMP 892 /* Deactivate elfcorehdr= kernel parameter */ 893 elfcorehdr_addr = ELFCORE_ADDR_MAX; 894 #endif 895 896 os_info_init(); 897 setup_ipl(); 898 setup_task_size(); 899 900 /* Do some memory reservations *before* memory is added to memblock */ 901 reserve_memory_end(); 902 reserve_oldmem(); 903 reserve_kernel(); 904 reserve_initrd(); 905 memblock_allow_resize(); 906 907 /* Get information about *all* installed memory */ 908 detect_memory_memblock(); 909 910 remove_oldmem(); 911 912 /* 913 * Make sure all chunks are MAX_ORDER aligned so we don't need the 914 * extra checks that HOLES_IN_ZONE would require. 915 * 916 * Is this still required? 917 */ 918 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 919 920 setup_memory_end(); 921 setup_memory(); 922 dma_contiguous_reserve(memory_end); 923 vmcp_cma_reserve(); 924 925 check_initrd(); 926 reserve_crashkernel(); 927 #ifdef CONFIG_CRASH_DUMP 928 /* 929 * Be aware that smp_save_dump_cpus() triggers a system reset. 930 * Therefore CPU and device initialization should be done afterwards. 931 */ 932 smp_save_dump_cpus(); 933 #endif 934 935 setup_resources(); 936 setup_lowcore(); 937 smp_fill_possible_mask(); 938 cpu_detect_mhz_feature(); 939 cpu_init(); 940 numa_setup(); 941 smp_detect_cpus(); 942 topology_init_early(); 943 944 /* 945 * Create kernel page tables and switch to virtual addressing. 946 */ 947 paging_init(); 948 949 /* Setup default console */ 950 conmode_default(); 951 set_preferred_console(); 952 953 apply_alternative_instructions(); 954 955 /* Setup zfcpdump support */ 956 setup_zfcpdump(); 957 958 /* Add system specific data to the random pool */ 959 setup_randomness(); 960 } 961