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/ftrace.h> 45 #include <linux/kexec.h> 46 #include <linux/crash_dump.h> 47 #include <linux/memory.h> 48 #include <linux/compat.h> 49 50 #include <asm/ipl.h> 51 #include <asm/facility.h> 52 #include <asm/smp.h> 53 #include <asm/mmu_context.h> 54 #include <asm/cpcmd.h> 55 #include <asm/lowcore.h> 56 #include <asm/irq.h> 57 #include <asm/page.h> 58 #include <asm/ptrace.h> 59 #include <asm/sections.h> 60 #include <asm/ebcdic.h> 61 #include <asm/kvm_virtio.h> 62 #include <asm/diag.h> 63 #include <asm/os_info.h> 64 #include <asm/sclp.h> 65 #include <asm/sysinfo.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 = 0; 81 char elf_platform[ELF_PLATFORM_SIZE]; 82 83 int __initdata memory_end_set; 84 unsigned long __initdata memory_end; 85 unsigned long __initdata max_physmem_end; 86 87 unsigned long VMALLOC_START; 88 EXPORT_SYMBOL(VMALLOC_START); 89 90 unsigned long VMALLOC_END; 91 EXPORT_SYMBOL(VMALLOC_END); 92 93 struct page *vmemmap; 94 EXPORT_SYMBOL(vmemmap); 95 96 #ifdef CONFIG_64BIT 97 unsigned long MODULES_VADDR; 98 unsigned long MODULES_END; 99 #endif 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 = 305 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 306 lc->external_new_psw.mask = PSW_KERNEL_BITS | 307 PSW_MASK_DAT | PSW_MASK_MCHECK; 308 lc->external_new_psw.addr = 309 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 310 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 311 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 312 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 313 lc->program_new_psw.mask = PSW_KERNEL_BITS | 314 PSW_MASK_DAT | PSW_MASK_MCHECK; 315 lc->program_new_psw.addr = 316 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler; 317 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 318 lc->mcck_new_psw.addr = 319 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 320 lc->io_new_psw.mask = PSW_KERNEL_BITS | 321 PSW_MASK_DAT | PSW_MASK_MCHECK; 322 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 323 lc->clock_comparator = -1ULL; 324 lc->kernel_stack = ((unsigned long) &init_thread_union) 325 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 326 lc->async_stack = (unsigned long) 327 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) 328 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 329 lc->panic_stack = (unsigned long) 330 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) 331 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 332 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 333 lc->thread_info = (unsigned long) &init_thread_union; 334 lc->machine_flags = S390_lowcore.machine_flags; 335 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 336 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 337 MAX_FACILITY_BIT/8); 338 #ifndef CONFIG_64BIT 339 if (MACHINE_HAS_IEEE) { 340 lc->extended_save_area_addr = (__u32) 341 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0); 342 /* enable extended save area */ 343 __ctl_set_bit(14, 29); 344 } 345 #else 346 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 347 #endif 348 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 349 lc->async_enter_timer = S390_lowcore.async_enter_timer; 350 lc->exit_timer = S390_lowcore.exit_timer; 351 lc->user_timer = S390_lowcore.user_timer; 352 lc->system_timer = S390_lowcore.system_timer; 353 lc->steal_timer = S390_lowcore.steal_timer; 354 lc->last_update_timer = S390_lowcore.last_update_timer; 355 lc->last_update_clock = S390_lowcore.last_update_clock; 356 lc->ftrace_func = S390_lowcore.ftrace_func; 357 358 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 359 restart_stack += ASYNC_SIZE; 360 361 /* 362 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 363 * restart data to the absolute zero lowcore. This is necessary if 364 * PSW restart is done on an offline CPU that has lowcore zero. 365 */ 366 lc->restart_stack = (unsigned long) restart_stack; 367 lc->restart_fn = (unsigned long) do_restart; 368 lc->restart_data = 0; 369 lc->restart_source = -1UL; 370 371 /* Setup absolute zero lowcore */ 372 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 373 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 374 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 375 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 376 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 377 378 #ifdef CONFIG_SMP 379 lc->spinlock_lockval = arch_spin_lockval(0); 380 #endif 381 382 set_prefix((u32)(unsigned long) lc); 383 lowcore_ptr[0] = lc; 384 } 385 386 static struct resource code_resource = { 387 .name = "Kernel code", 388 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 389 }; 390 391 static struct resource data_resource = { 392 .name = "Kernel data", 393 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 394 }; 395 396 static struct resource bss_resource = { 397 .name = "Kernel bss", 398 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 399 }; 400 401 static struct resource __initdata *standard_resources[] = { 402 &code_resource, 403 &data_resource, 404 &bss_resource, 405 }; 406 407 static void __init setup_resources(void) 408 { 409 struct resource *res, *std_res, *sub_res; 410 struct memblock_region *reg; 411 int j; 412 413 code_resource.start = (unsigned long) &_text; 414 code_resource.end = (unsigned long) &_etext - 1; 415 data_resource.start = (unsigned long) &_etext; 416 data_resource.end = (unsigned long) &_edata - 1; 417 bss_resource.start = (unsigned long) &__bss_start; 418 bss_resource.end = (unsigned long) &__bss_stop - 1; 419 420 for_each_memblock(memory, reg) { 421 res = alloc_bootmem_low(sizeof(*res)); 422 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 423 424 res->name = "System RAM"; 425 res->start = reg->base; 426 res->end = reg->base + reg->size - 1; 427 request_resource(&iomem_resource, res); 428 429 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 430 std_res = standard_resources[j]; 431 if (std_res->start < res->start || 432 std_res->start > res->end) 433 continue; 434 if (std_res->end > res->end) { 435 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 436 *sub_res = *std_res; 437 sub_res->end = res->end; 438 std_res->start = res->end + 1; 439 request_resource(res, sub_res); 440 } else { 441 request_resource(res, std_res); 442 } 443 } 444 } 445 } 446 447 static void __init setup_memory_end(void) 448 { 449 unsigned long vmax, vmalloc_size, tmp; 450 451 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 452 #ifdef CONFIG_64BIT 453 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 454 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 455 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size; 456 if (tmp <= (1UL << 42)) 457 vmax = 1UL << 42; /* 3-level kernel page table */ 458 else 459 vmax = 1UL << 53; /* 4-level kernel page table */ 460 /* module area is at the end of the kernel address space. */ 461 MODULES_END = vmax; 462 MODULES_VADDR = MODULES_END - MODULES_LEN; 463 VMALLOC_END = MODULES_VADDR; 464 #else 465 vmalloc_size = VMALLOC_END ?: 96UL << 20; 466 vmax = 1UL << 31; /* 2-level kernel page table */ 467 /* vmalloc area is at the end of the kernel address space. */ 468 VMALLOC_END = vmax; 469 #endif 470 VMALLOC_START = vmax - vmalloc_size; 471 472 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 473 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 474 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 475 tmp = SECTION_ALIGN_UP(tmp); 476 tmp = VMALLOC_START - tmp * sizeof(struct page); 477 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 478 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 479 vmemmap = (struct page *) tmp; 480 481 /* Take care that memory_end is set and <= vmemmap */ 482 memory_end = min(memory_end ?: max_physmem_end, tmp); 483 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 484 memblock_remove(memory_end, ULONG_MAX); 485 486 pr_notice("Max memory size: %luMB\n", memory_end >> 20); 487 } 488 489 static void __init setup_vmcoreinfo(void) 490 { 491 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 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_get_hsa_size()) { 531 memory_end = sclp_get_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_get_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 insert_resource(&iomem_resource, &crashk_res); 623 memblock_remove(crash_base, crash_size); 624 pr_info("Reserving %lluMB of memory at %lluMB " 625 "for crashkernel (System RAM: %luMB)\n", 626 crash_size >> 20, crash_base >> 20, 627 (unsigned long)memblock.memory.total_size >> 20); 628 os_info_crashkernel_add(crash_base, crash_size); 629 #endif 630 } 631 632 /* 633 * Reserve the initrd from being used by memblock 634 */ 635 static void __init reserve_initrd(void) 636 { 637 #ifdef CONFIG_BLK_DEV_INITRD 638 initrd_start = INITRD_START; 639 initrd_end = initrd_start + INITRD_SIZE; 640 memblock_reserve(INITRD_START, INITRD_SIZE); 641 #endif 642 } 643 644 /* 645 * Check for initrd being in usable memory 646 */ 647 static void __init check_initrd(void) 648 { 649 #ifdef CONFIG_BLK_DEV_INITRD 650 if (INITRD_START && INITRD_SIZE && 651 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 652 pr_err("initrd does not fit memory.\n"); 653 memblock_free(INITRD_START, INITRD_SIZE); 654 initrd_start = initrd_end = 0; 655 } 656 #endif 657 } 658 659 /* 660 * Reserve all kernel text 661 */ 662 static void __init reserve_kernel(void) 663 { 664 unsigned long start_pfn; 665 start_pfn = PFN_UP(__pa(&_end)); 666 667 /* 668 * Reserve memory used for lowcore/command line/kernel image. 669 */ 670 memblock_reserve(0, (unsigned long)_ehead); 671 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 672 - (unsigned long)_stext); 673 } 674 675 static void __init reserve_elfcorehdr(void) 676 { 677 #ifdef CONFIG_CRASH_DUMP 678 if (is_kdump_kernel()) 679 memblock_reserve(elfcorehdr_addr - OLDMEM_BASE, 680 PAGE_ALIGN(elfcorehdr_size)); 681 #endif 682 } 683 684 static void __init setup_memory(void) 685 { 686 struct memblock_region *reg; 687 688 /* 689 * Init storage key for present memory 690 */ 691 for_each_memblock(memory, reg) { 692 storage_key_init_range(reg->base, reg->base + reg->size); 693 } 694 psw_set_key(PAGE_DEFAULT_KEY); 695 696 /* Only cosmetics */ 697 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 698 } 699 700 /* 701 * Setup hardware capabilities. 702 */ 703 static void __init setup_hwcaps(void) 704 { 705 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 706 struct cpuid cpu_id; 707 int i; 708 709 /* 710 * The store facility list bits numbers as found in the principles 711 * of operation are numbered with bit 1UL<<31 as number 0 to 712 * bit 1UL<<0 as number 31. 713 * Bit 0: instructions named N3, "backported" to esa-mode 714 * Bit 2: z/Architecture mode is active 715 * Bit 7: the store-facility-list-extended facility is installed 716 * Bit 17: the message-security assist is installed 717 * Bit 19: the long-displacement facility is installed 718 * Bit 21: the extended-immediate facility is installed 719 * Bit 22: extended-translation facility 3 is installed 720 * Bit 30: extended-translation facility 3 enhancement facility 721 * These get translated to: 722 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 723 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 724 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 725 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 726 */ 727 for (i = 0; i < 6; i++) 728 if (test_facility(stfl_bits[i])) 729 elf_hwcap |= 1UL << i; 730 731 if (test_facility(22) && test_facility(30)) 732 elf_hwcap |= HWCAP_S390_ETF3EH; 733 734 /* 735 * Check for additional facilities with store-facility-list-extended. 736 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 737 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 738 * as stored by stfl, bits 32-xxx contain additional facilities. 739 * How many facility words are stored depends on the number of 740 * doublewords passed to the instruction. The additional facilities 741 * are: 742 * Bit 42: decimal floating point facility is installed 743 * Bit 44: perform floating point operation facility is installed 744 * translated to: 745 * HWCAP_S390_DFP bit 6 (42 && 44). 746 */ 747 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 748 elf_hwcap |= HWCAP_S390_DFP; 749 750 /* 751 * Huge page support HWCAP_S390_HPAGE is bit 7. 752 */ 753 if (MACHINE_HAS_HPAGE) 754 elf_hwcap |= HWCAP_S390_HPAGE; 755 756 #if defined(CONFIG_64BIT) 757 /* 758 * 64-bit register support for 31-bit processes 759 * HWCAP_S390_HIGH_GPRS is bit 9. 760 */ 761 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 762 763 /* 764 * Transactional execution support HWCAP_S390_TE is bit 10. 765 */ 766 if (test_facility(50) && test_facility(73)) 767 elf_hwcap |= HWCAP_S390_TE; 768 #endif 769 770 get_cpu_id(&cpu_id); 771 add_device_randomness(&cpu_id, sizeof(cpu_id)); 772 switch (cpu_id.machine) { 773 case 0x9672: 774 #if !defined(CONFIG_64BIT) 775 default: /* Use "g5" as default for 31 bit kernels. */ 776 #endif 777 strcpy(elf_platform, "g5"); 778 break; 779 case 0x2064: 780 case 0x2066: 781 #if defined(CONFIG_64BIT) 782 default: /* Use "z900" as default for 64 bit kernels. */ 783 #endif 784 strcpy(elf_platform, "z900"); 785 break; 786 case 0x2084: 787 case 0x2086: 788 strcpy(elf_platform, "z990"); 789 break; 790 case 0x2094: 791 case 0x2096: 792 strcpy(elf_platform, "z9-109"); 793 break; 794 case 0x2097: 795 case 0x2098: 796 strcpy(elf_platform, "z10"); 797 break; 798 case 0x2817: 799 case 0x2818: 800 strcpy(elf_platform, "z196"); 801 break; 802 case 0x2827: 803 case 0x2828: 804 strcpy(elf_platform, "zEC12"); 805 break; 806 } 807 } 808 809 /* 810 * Add system information as device randomness 811 */ 812 static void __init setup_randomness(void) 813 { 814 struct sysinfo_3_2_2 *vmms; 815 816 vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL); 817 if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count) 818 add_device_randomness(&vmms, vmms->count); 819 free_page((unsigned long) vmms); 820 } 821 822 /* 823 * Setup function called from init/main.c just after the banner 824 * was printed. 825 */ 826 827 void __init setup_arch(char **cmdline_p) 828 { 829 /* 830 * print what head.S has found out about the machine 831 */ 832 #ifndef CONFIG_64BIT 833 if (MACHINE_IS_VM) 834 pr_info("Linux is running as a z/VM " 835 "guest operating system in 31-bit mode\n"); 836 else if (MACHINE_IS_LPAR) 837 pr_info("Linux is running natively in 31-bit mode\n"); 838 if (MACHINE_HAS_IEEE) 839 pr_info("The hardware system has IEEE compatible " 840 "floating point units\n"); 841 else 842 pr_info("The hardware system has no IEEE compatible " 843 "floating point units\n"); 844 #else /* CONFIG_64BIT */ 845 if (MACHINE_IS_VM) 846 pr_info("Linux is running as a z/VM " 847 "guest operating system in 64-bit mode\n"); 848 else if (MACHINE_IS_KVM) 849 pr_info("Linux is running under KVM in 64-bit mode\n"); 850 else if (MACHINE_IS_LPAR) 851 pr_info("Linux is running natively in 64-bit mode\n"); 852 #endif /* CONFIG_64BIT */ 853 854 /* Have one command line that is parsed and saved in /proc/cmdline */ 855 /* boot_command_line has been already set up in early.c */ 856 *cmdline_p = boot_command_line; 857 858 ROOT_DEV = Root_RAM0; 859 860 /* Is init_mm really needed? */ 861 init_mm.start_code = PAGE_OFFSET; 862 init_mm.end_code = (unsigned long) &_etext; 863 init_mm.end_data = (unsigned long) &_edata; 864 init_mm.brk = (unsigned long) &_end; 865 866 parse_early_param(); 867 os_info_init(); 868 setup_ipl(); 869 870 /* Do some memory reservations *before* memory is added to memblock */ 871 reserve_memory_end(); 872 reserve_oldmem(); 873 reserve_kernel(); 874 reserve_initrd(); 875 reserve_elfcorehdr(); 876 memblock_allow_resize(); 877 878 /* Get information about *all* installed memory */ 879 detect_memory_memblock(); 880 881 remove_oldmem(); 882 883 /* 884 * Make sure all chunks are MAX_ORDER aligned so we don't need the 885 * extra checks that HOLES_IN_ZONE would require. 886 * 887 * Is this still required? 888 */ 889 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 890 891 setup_memory_end(); 892 setup_memory(); 893 894 check_initrd(); 895 reserve_crashkernel(); 896 897 setup_resources(); 898 setup_vmcoreinfo(); 899 setup_lowcore(); 900 smp_fill_possible_mask(); 901 cpu_init(); 902 s390_init_cpu_topology(); 903 904 /* 905 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 906 */ 907 setup_hwcaps(); 908 909 /* 910 * Create kernel page tables and switch to virtual addressing. 911 */ 912 paging_init(); 913 914 /* Setup default console */ 915 conmode_default(); 916 set_preferred_console(); 917 918 /* Setup zfcpdump support */ 919 setup_zfcpdump(); 920 921 /* Add system specific data to the random pool */ 922 setup_randomness(); 923 } 924 925 #ifdef CONFIG_32BIT 926 static int no_removal_warning __initdata; 927 928 static int __init parse_no_removal_warning(char *str) 929 { 930 no_removal_warning = 1; 931 return 0; 932 } 933 __setup("no_removal_warning", parse_no_removal_warning); 934 935 static int __init removal_warning(void) 936 { 937 if (no_removal_warning) 938 return 0; 939 printk(KERN_ALERT "\n\n"); 940 printk(KERN_CONT "Warning - you are using a 31 bit kernel!\n\n"); 941 printk(KERN_CONT "We plan to remove 31 bit kernel support from the kernel sources in March 2015.\n"); 942 printk(KERN_CONT "Currently we assume that nobody is using the 31 bit kernel on old 31 bit\n"); 943 printk(KERN_CONT "hardware anymore. If you think that the code should not be removed and also\n"); 944 printk(KERN_CONT "future versions of the Linux kernel should be able to run in 31 bit mode\n"); 945 printk(KERN_CONT "please let us know. Please write to:\n"); 946 printk(KERN_CONT "linux390@de.ibm.com (mail address) and/or\n"); 947 printk(KERN_CONT "linux-s390@vger.kernel.org (mailing list).\n\n"); 948 printk(KERN_CONT "Thank you!\n\n"); 949 printk(KERN_CONT "If this kernel runs on a 64 bit machine you may consider using a 64 bit kernel.\n"); 950 printk(KERN_CONT "This message can be disabled with the \"no_removal_warning\" kernel parameter.\n"); 951 schedule_timeout_uninterruptible(300 * HZ); 952 return 0; 953 } 954 early_initcall(removal_warning); 955 #endif 956