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/kernel.h> 22 #include <linux/memblock.h> 23 #include <linux/mm.h> 24 #include <linux/stddef.h> 25 #include <linux/unistd.h> 26 #include <linux/ptrace.h> 27 #include <linux/random.h> 28 #include <linux/user.h> 29 #include <linux/tty.h> 30 #include <linux/ioport.h> 31 #include <linux/delay.h> 32 #include <linux/init.h> 33 #include <linux/initrd.h> 34 #include <linux/bootmem.h> 35 #include <linux/root_dev.h> 36 #include <linux/console.h> 37 #include <linux/kernel_stat.h> 38 #include <linux/device.h> 39 #include <linux/notifier.h> 40 #include <linux/pfn.h> 41 #include <linux/ctype.h> 42 #include <linux/reboot.h> 43 #include <linux/topology.h> 44 #include <linux/kexec.h> 45 #include <linux/crash_dump.h> 46 #include <linux/memory.h> 47 #include <linux/compat.h> 48 49 #include <asm/ipl.h> 50 #include <asm/facility.h> 51 #include <asm/smp.h> 52 #include <asm/mmu_context.h> 53 #include <asm/cpcmd.h> 54 #include <asm/lowcore.h> 55 #include <asm/irq.h> 56 #include <asm/page.h> 57 #include <asm/ptrace.h> 58 #include <asm/sections.h> 59 #include <asm/ebcdic.h> 60 #include <asm/kvm_virtio.h> 61 #include <asm/diag.h> 62 #include <asm/os_info.h> 63 #include <asm/sclp.h> 64 #include <asm/sysinfo.h> 65 #include <asm/numa.h> 66 #include "entry.h" 67 68 /* 69 * Machine setup.. 70 */ 71 unsigned int console_mode = 0; 72 EXPORT_SYMBOL(console_mode); 73 74 unsigned int console_devno = -1; 75 EXPORT_SYMBOL(console_devno); 76 77 unsigned int console_irq = -1; 78 EXPORT_SYMBOL(console_irq); 79 80 unsigned long elf_hwcap __read_mostly = 0; 81 char elf_platform[ELF_PLATFORM_SIZE]; 82 83 unsigned long int_hwcap = 0; 84 85 int __initdata memory_end_set; 86 unsigned long __initdata memory_end; 87 unsigned long __initdata max_physmem_end; 88 89 unsigned long VMALLOC_START; 90 EXPORT_SYMBOL(VMALLOC_START); 91 92 unsigned long VMALLOC_END; 93 EXPORT_SYMBOL(VMALLOC_END); 94 95 struct page *vmemmap; 96 EXPORT_SYMBOL(vmemmap); 97 98 unsigned long MODULES_VADDR; 99 unsigned long MODULES_END; 100 101 /* An array with a pointer to the lowcore of every CPU. */ 102 struct lowcore *lowcore_ptr[NR_CPUS]; 103 EXPORT_SYMBOL(lowcore_ptr); 104 105 /* 106 * This is set up by the setup-routine at boot-time 107 * for S390 need to find out, what we have to setup 108 * using address 0x10400 ... 109 */ 110 111 #include <asm/setup.h> 112 113 /* 114 * condev= and conmode= setup parameter. 115 */ 116 117 static int __init condev_setup(char *str) 118 { 119 int vdev; 120 121 vdev = simple_strtoul(str, &str, 0); 122 if (vdev >= 0 && vdev < 65536) { 123 console_devno = vdev; 124 console_irq = -1; 125 } 126 return 1; 127 } 128 129 __setup("condev=", condev_setup); 130 131 static void __init set_preferred_console(void) 132 { 133 if (MACHINE_IS_KVM) { 134 if (sclp.has_vt220) 135 add_preferred_console("ttyS", 1, NULL); 136 else if (sclp.has_linemode) 137 add_preferred_console("ttyS", 0, NULL); 138 else 139 add_preferred_console("hvc", 0, NULL); 140 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 141 add_preferred_console("ttyS", 0, NULL); 142 else if (CONSOLE_IS_3270) 143 add_preferred_console("tty3270", 0, NULL); 144 } 145 146 static int __init conmode_setup(char *str) 147 { 148 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 149 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 150 SET_CONSOLE_SCLP; 151 #endif 152 #if defined(CONFIG_TN3215_CONSOLE) 153 if (strncmp(str, "3215", 5) == 0) 154 SET_CONSOLE_3215; 155 #endif 156 #if defined(CONFIG_TN3270_CONSOLE) 157 if (strncmp(str, "3270", 5) == 0) 158 SET_CONSOLE_3270; 159 #endif 160 set_preferred_console(); 161 return 1; 162 } 163 164 __setup("conmode=", conmode_setup); 165 166 static void __init conmode_default(void) 167 { 168 char query_buffer[1024]; 169 char *ptr; 170 171 if (MACHINE_IS_VM) { 172 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 173 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 174 ptr = strstr(query_buffer, "SUBCHANNEL ="); 175 console_irq = simple_strtoul(ptr + 13, NULL, 16); 176 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 177 ptr = strstr(query_buffer, "CONMODE"); 178 /* 179 * Set the conmode to 3215 so that the device recognition 180 * will set the cu_type of the console to 3215. If the 181 * conmode is 3270 and we don't set it back then both 182 * 3215 and the 3270 driver will try to access the console 183 * device (3215 as console and 3270 as normal tty). 184 */ 185 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 186 if (ptr == NULL) { 187 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 188 SET_CONSOLE_SCLP; 189 #endif 190 return; 191 } 192 if (strncmp(ptr + 8, "3270", 4) == 0) { 193 #if defined(CONFIG_TN3270_CONSOLE) 194 SET_CONSOLE_3270; 195 #elif defined(CONFIG_TN3215_CONSOLE) 196 SET_CONSOLE_3215; 197 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 198 SET_CONSOLE_SCLP; 199 #endif 200 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 201 #if defined(CONFIG_TN3215_CONSOLE) 202 SET_CONSOLE_3215; 203 #elif defined(CONFIG_TN3270_CONSOLE) 204 SET_CONSOLE_3270; 205 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 206 SET_CONSOLE_SCLP; 207 #endif 208 } 209 } else { 210 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 211 SET_CONSOLE_SCLP; 212 #endif 213 } 214 } 215 216 #ifdef CONFIG_CRASH_DUMP 217 static void __init setup_zfcpdump(void) 218 { 219 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 220 return; 221 if (OLDMEM_BASE) 222 return; 223 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 224 console_loglevel = 2; 225 } 226 #else 227 static inline void setup_zfcpdump(void) {} 228 #endif /* CONFIG_CRASH_DUMP */ 229 230 /* 231 * Reboot, halt and power_off stubs. They just call _machine_restart, 232 * _machine_halt or _machine_power_off. 233 */ 234 235 void machine_restart(char *command) 236 { 237 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 238 /* 239 * Only unblank the console if we are called in enabled 240 * context or a bust_spinlocks cleared the way for us. 241 */ 242 console_unblank(); 243 _machine_restart(command); 244 } 245 246 void machine_halt(void) 247 { 248 if (!in_interrupt() || oops_in_progress) 249 /* 250 * Only unblank the console if we are called in enabled 251 * context or a bust_spinlocks cleared the way for us. 252 */ 253 console_unblank(); 254 _machine_halt(); 255 } 256 257 void machine_power_off(void) 258 { 259 if (!in_interrupt() || oops_in_progress) 260 /* 261 * Only unblank the console if we are called in enabled 262 * context or a bust_spinlocks cleared the way for us. 263 */ 264 console_unblank(); 265 _machine_power_off(); 266 } 267 268 /* 269 * Dummy power off function. 270 */ 271 void (*pm_power_off)(void) = machine_power_off; 272 EXPORT_SYMBOL_GPL(pm_power_off); 273 274 static int __init early_parse_mem(char *p) 275 { 276 memory_end = memparse(p, &p); 277 memory_end &= PAGE_MASK; 278 memory_end_set = 1; 279 return 0; 280 } 281 early_param("mem", early_parse_mem); 282 283 static int __init parse_vmalloc(char *arg) 284 { 285 if (!arg) 286 return -EINVAL; 287 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 288 return 0; 289 } 290 early_param("vmalloc", parse_vmalloc); 291 292 void *restart_stack __attribute__((__section__(".data"))); 293 294 static void __init setup_lowcore(void) 295 { 296 struct lowcore *lc; 297 298 /* 299 * Setup lowcore for boot cpu 300 */ 301 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096); 302 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 303 lc->restart_psw.mask = PSW_KERNEL_BITS; 304 lc->restart_psw.addr = (unsigned long) restart_int_handler; 305 lc->external_new_psw.mask = PSW_KERNEL_BITS | 306 PSW_MASK_DAT | PSW_MASK_MCHECK; 307 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 308 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 309 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 310 lc->svc_new_psw.addr = (unsigned long) system_call; 311 lc->program_new_psw.mask = PSW_KERNEL_BITS | 312 PSW_MASK_DAT | PSW_MASK_MCHECK; 313 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 314 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 315 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 316 lc->io_new_psw.mask = PSW_KERNEL_BITS | 317 PSW_MASK_DAT | PSW_MASK_MCHECK; 318 lc->io_new_psw.addr = (unsigned long) io_int_handler; 319 lc->clock_comparator = -1ULL; 320 lc->kernel_stack = ((unsigned long) &init_thread_union) 321 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 322 lc->async_stack = (unsigned long) 323 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) 324 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 325 lc->panic_stack = (unsigned long) 326 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) 327 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 328 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 329 lc->thread_info = (unsigned long) &init_thread_union; 330 lc->machine_flags = S390_lowcore.machine_flags; 331 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 332 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 333 MAX_FACILITY_BIT/8); 334 if (MACHINE_HAS_VX) 335 lc->vector_save_area_addr = 336 (unsigned long) &lc->vector_save_area; 337 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 338 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 339 lc->async_enter_timer = S390_lowcore.async_enter_timer; 340 lc->exit_timer = S390_lowcore.exit_timer; 341 lc->user_timer = S390_lowcore.user_timer; 342 lc->system_timer = S390_lowcore.system_timer; 343 lc->steal_timer = S390_lowcore.steal_timer; 344 lc->last_update_timer = S390_lowcore.last_update_timer; 345 lc->last_update_clock = S390_lowcore.last_update_clock; 346 347 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 348 restart_stack += ASYNC_SIZE; 349 350 /* 351 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 352 * restart data to the absolute zero lowcore. This is necessary if 353 * PSW restart is done on an offline CPU that has lowcore zero. 354 */ 355 lc->restart_stack = (unsigned long) restart_stack; 356 lc->restart_fn = (unsigned long) do_restart; 357 lc->restart_data = 0; 358 lc->restart_source = -1UL; 359 360 /* Setup absolute zero lowcore */ 361 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 362 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 363 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 364 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 365 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 366 367 #ifdef CONFIG_SMP 368 lc->spinlock_lockval = arch_spin_lockval(0); 369 #endif 370 371 set_prefix((u32)(unsigned long) lc); 372 lowcore_ptr[0] = lc; 373 } 374 375 static struct resource code_resource = { 376 .name = "Kernel code", 377 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 378 }; 379 380 static struct resource data_resource = { 381 .name = "Kernel data", 382 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 383 }; 384 385 static struct resource bss_resource = { 386 .name = "Kernel bss", 387 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 388 }; 389 390 static struct resource __initdata *standard_resources[] = { 391 &code_resource, 392 &data_resource, 393 &bss_resource, 394 }; 395 396 static void __init setup_resources(void) 397 { 398 struct resource *res, *std_res, *sub_res; 399 struct memblock_region *reg; 400 int j; 401 402 code_resource.start = (unsigned long) &_text; 403 code_resource.end = (unsigned long) &_etext - 1; 404 data_resource.start = (unsigned long) &_etext; 405 data_resource.end = (unsigned long) &_edata - 1; 406 bss_resource.start = (unsigned long) &__bss_start; 407 bss_resource.end = (unsigned long) &__bss_stop - 1; 408 409 for_each_memblock(memory, reg) { 410 res = alloc_bootmem_low(sizeof(*res)); 411 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 412 413 res->name = "System RAM"; 414 res->start = reg->base; 415 res->end = reg->base + reg->size - 1; 416 request_resource(&iomem_resource, res); 417 418 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 419 std_res = standard_resources[j]; 420 if (std_res->start < res->start || 421 std_res->start > res->end) 422 continue; 423 if (std_res->end > res->end) { 424 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 425 *sub_res = *std_res; 426 sub_res->end = res->end; 427 std_res->start = res->end + 1; 428 request_resource(res, sub_res); 429 } else { 430 request_resource(res, std_res); 431 } 432 } 433 } 434 } 435 436 static void __init setup_memory_end(void) 437 { 438 unsigned long vmax, vmalloc_size, tmp; 439 440 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 441 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 442 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 443 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 444 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42)) 445 vmax = 1UL << 42; /* 3-level kernel page table */ 446 else 447 vmax = 1UL << 53; /* 4-level kernel page table */ 448 /* module area is at the end of the kernel address space. */ 449 MODULES_END = vmax; 450 MODULES_VADDR = MODULES_END - MODULES_LEN; 451 VMALLOC_END = MODULES_VADDR; 452 VMALLOC_START = vmax - vmalloc_size; 453 454 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 455 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 456 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 457 tmp = SECTION_ALIGN_UP(tmp); 458 tmp = VMALLOC_START - tmp * sizeof(struct page); 459 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 460 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 461 vmemmap = (struct page *) tmp; 462 463 /* Take care that memory_end is set and <= vmemmap */ 464 memory_end = min(memory_end ?: max_physmem_end, tmp); 465 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 466 memblock_remove(memory_end, ULONG_MAX); 467 468 pr_notice("Max memory size: %luMB\n", memory_end >> 20); 469 } 470 471 static void __init setup_vmcoreinfo(void) 472 { 473 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 474 } 475 476 #ifdef CONFIG_CRASH_DUMP 477 478 /* 479 * When kdump is enabled, we have to ensure that no memory from 480 * the area [0 - crashkernel memory size] and 481 * [crashk_res.start - crashk_res.end] is set offline. 482 */ 483 static int kdump_mem_notifier(struct notifier_block *nb, 484 unsigned long action, void *data) 485 { 486 struct memory_notify *arg = data; 487 488 if (action != MEM_GOING_OFFLINE) 489 return NOTIFY_OK; 490 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 491 return NOTIFY_BAD; 492 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 493 return NOTIFY_OK; 494 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 495 return NOTIFY_OK; 496 return NOTIFY_BAD; 497 } 498 499 static struct notifier_block kdump_mem_nb = { 500 .notifier_call = kdump_mem_notifier, 501 }; 502 503 #endif 504 505 /* 506 * Make sure that the area behind memory_end is protected 507 */ 508 static void reserve_memory_end(void) 509 { 510 #ifdef CONFIG_CRASH_DUMP 511 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 512 !OLDMEM_BASE && sclp.hsa_size) { 513 memory_end = sclp.hsa_size; 514 memory_end &= PAGE_MASK; 515 memory_end_set = 1; 516 } 517 #endif 518 if (!memory_end_set) 519 return; 520 memblock_reserve(memory_end, ULONG_MAX); 521 } 522 523 /* 524 * Make sure that oldmem, where the dump is stored, is protected 525 */ 526 static void reserve_oldmem(void) 527 { 528 #ifdef CONFIG_CRASH_DUMP 529 if (OLDMEM_BASE) 530 /* Forget all memory above the running kdump system */ 531 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 532 #endif 533 } 534 535 /* 536 * Make sure that oldmem, where the dump is stored, is protected 537 */ 538 static void remove_oldmem(void) 539 { 540 #ifdef CONFIG_CRASH_DUMP 541 if (OLDMEM_BASE) 542 /* Forget all memory above the running kdump system */ 543 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 544 #endif 545 } 546 547 /* 548 * Reserve memory for kdump kernel to be loaded with kexec 549 */ 550 static void __init reserve_crashkernel(void) 551 { 552 #ifdef CONFIG_CRASH_DUMP 553 unsigned long long crash_base, crash_size; 554 phys_addr_t low, high; 555 int rc; 556 557 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 558 &crash_base); 559 560 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 561 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 562 if (rc || crash_size == 0) 563 return; 564 565 if (memblock.memory.regions[0].size < crash_size) { 566 pr_info("crashkernel reservation failed: %s\n", 567 "first memory chunk must be at least crashkernel size"); 568 return; 569 } 570 571 low = crash_base ?: OLDMEM_BASE; 572 high = low + crash_size; 573 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 574 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 575 crash_base = low; 576 } else { 577 /* Find suitable area in free memory */ 578 low = max_t(unsigned long, crash_size, sclp.hsa_size); 579 high = crash_base ? crash_base + crash_size : ULONG_MAX; 580 581 if (crash_base && crash_base < low) { 582 pr_info("crashkernel reservation failed: %s\n", 583 "crash_base too low"); 584 return; 585 } 586 low = crash_base ?: low; 587 crash_base = memblock_find_in_range(low, high, crash_size, 588 KEXEC_CRASH_MEM_ALIGN); 589 } 590 591 if (!crash_base) { 592 pr_info("crashkernel reservation failed: %s\n", 593 "no suitable area found"); 594 return; 595 } 596 597 if (register_memory_notifier(&kdump_mem_nb)) 598 return; 599 600 if (!OLDMEM_BASE && MACHINE_IS_VM) 601 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 602 crashk_res.start = crash_base; 603 crashk_res.end = crash_base + crash_size - 1; 604 insert_resource(&iomem_resource, &crashk_res); 605 memblock_remove(crash_base, crash_size); 606 pr_info("Reserving %lluMB of memory at %lluMB " 607 "for crashkernel (System RAM: %luMB)\n", 608 crash_size >> 20, crash_base >> 20, 609 (unsigned long)memblock.memory.total_size >> 20); 610 os_info_crashkernel_add(crash_base, crash_size); 611 #endif 612 } 613 614 /* 615 * Reserve the initrd from being used by memblock 616 */ 617 static void __init reserve_initrd(void) 618 { 619 #ifdef CONFIG_BLK_DEV_INITRD 620 initrd_start = INITRD_START; 621 initrd_end = initrd_start + INITRD_SIZE; 622 memblock_reserve(INITRD_START, INITRD_SIZE); 623 #endif 624 } 625 626 /* 627 * Check for initrd being in usable memory 628 */ 629 static void __init check_initrd(void) 630 { 631 #ifdef CONFIG_BLK_DEV_INITRD 632 if (INITRD_START && INITRD_SIZE && 633 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 634 pr_err("initrd does not fit memory.\n"); 635 memblock_free(INITRD_START, INITRD_SIZE); 636 initrd_start = initrd_end = 0; 637 } 638 #endif 639 } 640 641 /* 642 * Reserve memory used for lowcore/command line/kernel image. 643 */ 644 static void __init reserve_kernel(void) 645 { 646 unsigned long start_pfn = PFN_UP(__pa(&_end)); 647 648 #ifdef CONFIG_DMA_API_DEBUG 649 /* 650 * DMA_API_DEBUG code stumbles over addresses from the 651 * range [_ehead, _stext]. Mark the memory as reserved 652 * so it is not used for CONFIG_DMA_API_DEBUG=y. 653 */ 654 memblock_reserve(0, PFN_PHYS(start_pfn)); 655 #else 656 memblock_reserve(0, (unsigned long)_ehead); 657 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 658 - (unsigned long)_stext); 659 #endif 660 } 661 662 static void __init setup_memory(void) 663 { 664 struct memblock_region *reg; 665 666 /* 667 * Init storage key for present memory 668 */ 669 for_each_memblock(memory, reg) { 670 storage_key_init_range(reg->base, reg->base + reg->size); 671 } 672 psw_set_key(PAGE_DEFAULT_KEY); 673 674 /* Only cosmetics */ 675 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 676 } 677 678 /* 679 * Setup hardware capabilities. 680 */ 681 static int __init setup_hwcaps(void) 682 { 683 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 684 struct cpuid cpu_id; 685 int i; 686 687 /* 688 * The store facility list bits numbers as found in the principles 689 * of operation are numbered with bit 1UL<<31 as number 0 to 690 * bit 1UL<<0 as number 31. 691 * Bit 0: instructions named N3, "backported" to esa-mode 692 * Bit 2: z/Architecture mode is active 693 * Bit 7: the store-facility-list-extended facility is installed 694 * Bit 17: the message-security assist is installed 695 * Bit 19: the long-displacement facility is installed 696 * Bit 21: the extended-immediate facility is installed 697 * Bit 22: extended-translation facility 3 is installed 698 * Bit 30: extended-translation facility 3 enhancement facility 699 * These get translated to: 700 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 701 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 702 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 703 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 704 */ 705 for (i = 0; i < 6; i++) 706 if (test_facility(stfl_bits[i])) 707 elf_hwcap |= 1UL << i; 708 709 if (test_facility(22) && test_facility(30)) 710 elf_hwcap |= HWCAP_S390_ETF3EH; 711 712 /* 713 * Check for additional facilities with store-facility-list-extended. 714 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 715 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 716 * as stored by stfl, bits 32-xxx contain additional facilities. 717 * How many facility words are stored depends on the number of 718 * doublewords passed to the instruction. The additional facilities 719 * are: 720 * Bit 42: decimal floating point facility is installed 721 * Bit 44: perform floating point operation facility is installed 722 * translated to: 723 * HWCAP_S390_DFP bit 6 (42 && 44). 724 */ 725 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 726 elf_hwcap |= HWCAP_S390_DFP; 727 728 /* 729 * Huge page support HWCAP_S390_HPAGE is bit 7. 730 */ 731 if (MACHINE_HAS_HPAGE) 732 elf_hwcap |= HWCAP_S390_HPAGE; 733 734 /* 735 * 64-bit register support for 31-bit processes 736 * HWCAP_S390_HIGH_GPRS is bit 9. 737 */ 738 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 739 740 /* 741 * Transactional execution support HWCAP_S390_TE is bit 10. 742 */ 743 if (test_facility(50) && test_facility(73)) 744 elf_hwcap |= HWCAP_S390_TE; 745 746 /* 747 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 748 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 749 * instead of facility bit 129. 750 */ 751 if (MACHINE_HAS_VX) 752 elf_hwcap |= HWCAP_S390_VXRS; 753 get_cpu_id(&cpu_id); 754 add_device_randomness(&cpu_id, sizeof(cpu_id)); 755 switch (cpu_id.machine) { 756 case 0x2064: 757 case 0x2066: 758 default: /* Use "z900" as default for 64 bit kernels. */ 759 strcpy(elf_platform, "z900"); 760 break; 761 case 0x2084: 762 case 0x2086: 763 strcpy(elf_platform, "z990"); 764 break; 765 case 0x2094: 766 case 0x2096: 767 strcpy(elf_platform, "z9-109"); 768 break; 769 case 0x2097: 770 case 0x2098: 771 strcpy(elf_platform, "z10"); 772 break; 773 case 0x2817: 774 case 0x2818: 775 strcpy(elf_platform, "z196"); 776 break; 777 case 0x2827: 778 case 0x2828: 779 strcpy(elf_platform, "zEC12"); 780 break; 781 case 0x2964: 782 strcpy(elf_platform, "z13"); 783 break; 784 } 785 786 /* 787 * Virtualization support HWCAP_INT_SIE is bit 0. 788 */ 789 if (sclp.has_sief2) 790 int_hwcap |= HWCAP_INT_SIE; 791 792 return 0; 793 } 794 arch_initcall(setup_hwcaps); 795 796 /* 797 * Add system information as device randomness 798 */ 799 static void __init setup_randomness(void) 800 { 801 struct sysinfo_3_2_2 *vmms; 802 803 vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL); 804 if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count) 805 add_device_randomness(&vmms, vmms->count); 806 free_page((unsigned long) vmms); 807 } 808 809 /* 810 * Setup function called from init/main.c just after the banner 811 * was printed. 812 */ 813 814 void __init setup_arch(char **cmdline_p) 815 { 816 /* 817 * print what head.S has found out about the machine 818 */ 819 if (MACHINE_IS_VM) 820 pr_info("Linux is running as a z/VM " 821 "guest operating system in 64-bit mode\n"); 822 else if (MACHINE_IS_KVM) 823 pr_info("Linux is running under KVM in 64-bit mode\n"); 824 else if (MACHINE_IS_LPAR) 825 pr_info("Linux is running natively in 64-bit mode\n"); 826 827 /* Have one command line that is parsed and saved in /proc/cmdline */ 828 /* boot_command_line has been already set up in early.c */ 829 *cmdline_p = boot_command_line; 830 831 ROOT_DEV = Root_RAM0; 832 833 /* Is init_mm really needed? */ 834 init_mm.start_code = PAGE_OFFSET; 835 init_mm.end_code = (unsigned long) &_etext; 836 init_mm.end_data = (unsigned long) &_edata; 837 init_mm.brk = (unsigned long) &_end; 838 839 parse_early_param(); 840 #ifdef CONFIG_CRASH_DUMP 841 /* Deactivate elfcorehdr= kernel parameter */ 842 elfcorehdr_addr = ELFCORE_ADDR_MAX; 843 #endif 844 845 os_info_init(); 846 setup_ipl(); 847 848 /* Do some memory reservations *before* memory is added to memblock */ 849 reserve_memory_end(); 850 reserve_oldmem(); 851 reserve_kernel(); 852 reserve_initrd(); 853 memblock_allow_resize(); 854 855 /* Get information about *all* installed memory */ 856 detect_memory_memblock(); 857 858 remove_oldmem(); 859 860 /* 861 * Make sure all chunks are MAX_ORDER aligned so we don't need the 862 * extra checks that HOLES_IN_ZONE would require. 863 * 864 * Is this still required? 865 */ 866 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 867 868 setup_memory_end(); 869 setup_memory(); 870 871 check_initrd(); 872 reserve_crashkernel(); 873 #ifdef CONFIG_CRASH_DUMP 874 /* 875 * Be aware that smp_save_dump_cpus() triggers a system reset. 876 * Therefore CPU and device initialization should be done afterwards. 877 */ 878 smp_save_dump_cpus(); 879 #endif 880 881 setup_resources(); 882 setup_vmcoreinfo(); 883 setup_lowcore(); 884 smp_fill_possible_mask(); 885 cpu_init(); 886 numa_setup(); 887 888 /* 889 * Create kernel page tables and switch to virtual addressing. 890 */ 891 paging_init(); 892 893 /* Setup default console */ 894 conmode_default(); 895 set_preferred_console(); 896 897 /* Setup zfcpdump support */ 898 setup_zfcpdump(); 899 900 /* Add system specific data to the random pool */ 901 setup_randomness(); 902 } 903