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/user.h> 28 #include <linux/tty.h> 29 #include <linux/ioport.h> 30 #include <linux/delay.h> 31 #include <linux/init.h> 32 #include <linux/initrd.h> 33 #include <linux/bootmem.h> 34 #include <linux/root_dev.h> 35 #include <linux/console.h> 36 #include <linux/kernel_stat.h> 37 #include <linux/device.h> 38 #include <linux/notifier.h> 39 #include <linux/pfn.h> 40 #include <linux/ctype.h> 41 #include <linux/reboot.h> 42 #include <linux/topology.h> 43 #include <linux/ftrace.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 "entry.h" 65 66 /* 67 * Machine setup.. 68 */ 69 unsigned int console_mode = 0; 70 EXPORT_SYMBOL(console_mode); 71 72 unsigned int console_devno = -1; 73 EXPORT_SYMBOL(console_devno); 74 75 unsigned int console_irq = -1; 76 EXPORT_SYMBOL(console_irq); 77 78 unsigned long elf_hwcap = 0; 79 char elf_platform[ELF_PLATFORM_SIZE]; 80 81 int __initdata memory_end_set; 82 unsigned long __initdata memory_end; 83 unsigned long __initdata max_physmem_end; 84 85 unsigned long VMALLOC_START; 86 EXPORT_SYMBOL(VMALLOC_START); 87 88 unsigned long VMALLOC_END; 89 EXPORT_SYMBOL(VMALLOC_END); 90 91 struct page *vmemmap; 92 EXPORT_SYMBOL(vmemmap); 93 94 #ifdef CONFIG_64BIT 95 unsigned long MODULES_VADDR; 96 unsigned long MODULES_END; 97 #endif 98 99 /* An array with a pointer to the lowcore of every CPU. */ 100 struct _lowcore *lowcore_ptr[NR_CPUS]; 101 EXPORT_SYMBOL(lowcore_ptr); 102 103 /* 104 * This is set up by the setup-routine at boot-time 105 * for S390 need to find out, what we have to setup 106 * using address 0x10400 ... 107 */ 108 109 #include <asm/setup.h> 110 111 /* 112 * condev= and conmode= setup parameter. 113 */ 114 115 static int __init condev_setup(char *str) 116 { 117 int vdev; 118 119 vdev = simple_strtoul(str, &str, 0); 120 if (vdev >= 0 && vdev < 65536) { 121 console_devno = vdev; 122 console_irq = -1; 123 } 124 return 1; 125 } 126 127 __setup("condev=", condev_setup); 128 129 static void __init set_preferred_console(void) 130 { 131 if (MACHINE_IS_KVM) { 132 if (sclp_has_vt220()) 133 add_preferred_console("ttyS", 1, NULL); 134 else if (sclp_has_linemode()) 135 add_preferred_console("ttyS", 0, NULL); 136 else 137 add_preferred_console("hvc", 0, NULL); 138 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 139 add_preferred_console("ttyS", 0, NULL); 140 else if (CONSOLE_IS_3270) 141 add_preferred_console("tty3270", 0, NULL); 142 } 143 144 static int __init conmode_setup(char *str) 145 { 146 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 147 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 148 SET_CONSOLE_SCLP; 149 #endif 150 #if defined(CONFIG_TN3215_CONSOLE) 151 if (strncmp(str, "3215", 5) == 0) 152 SET_CONSOLE_3215; 153 #endif 154 #if defined(CONFIG_TN3270_CONSOLE) 155 if (strncmp(str, "3270", 5) == 0) 156 SET_CONSOLE_3270; 157 #endif 158 set_preferred_console(); 159 return 1; 160 } 161 162 __setup("conmode=", conmode_setup); 163 164 static void __init conmode_default(void) 165 { 166 char query_buffer[1024]; 167 char *ptr; 168 169 if (MACHINE_IS_VM) { 170 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 171 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 172 ptr = strstr(query_buffer, "SUBCHANNEL ="); 173 console_irq = simple_strtoul(ptr + 13, NULL, 16); 174 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 175 ptr = strstr(query_buffer, "CONMODE"); 176 /* 177 * Set the conmode to 3215 so that the device recognition 178 * will set the cu_type of the console to 3215. If the 179 * conmode is 3270 and we don't set it back then both 180 * 3215 and the 3270 driver will try to access the console 181 * device (3215 as console and 3270 as normal tty). 182 */ 183 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 184 if (ptr == NULL) { 185 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 186 SET_CONSOLE_SCLP; 187 #endif 188 return; 189 } 190 if (strncmp(ptr + 8, "3270", 4) == 0) { 191 #if defined(CONFIG_TN3270_CONSOLE) 192 SET_CONSOLE_3270; 193 #elif defined(CONFIG_TN3215_CONSOLE) 194 SET_CONSOLE_3215; 195 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 196 SET_CONSOLE_SCLP; 197 #endif 198 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 199 #if defined(CONFIG_TN3215_CONSOLE) 200 SET_CONSOLE_3215; 201 #elif defined(CONFIG_TN3270_CONSOLE) 202 SET_CONSOLE_3270; 203 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 204 SET_CONSOLE_SCLP; 205 #endif 206 } 207 } else { 208 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 209 SET_CONSOLE_SCLP; 210 #endif 211 } 212 } 213 214 #ifdef CONFIG_CRASH_DUMP 215 static void __init setup_zfcpdump(void) 216 { 217 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 218 return; 219 if (OLDMEM_BASE) 220 return; 221 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 222 console_loglevel = 2; 223 } 224 #else 225 static inline void setup_zfcpdump(void) {} 226 #endif /* CONFIG_CRASH_DUMP */ 227 228 /* 229 * Reboot, halt and power_off stubs. They just call _machine_restart, 230 * _machine_halt or _machine_power_off. 231 */ 232 233 void machine_restart(char *command) 234 { 235 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 236 /* 237 * Only unblank the console if we are called in enabled 238 * context or a bust_spinlocks cleared the way for us. 239 */ 240 console_unblank(); 241 _machine_restart(command); 242 } 243 244 void machine_halt(void) 245 { 246 if (!in_interrupt() || oops_in_progress) 247 /* 248 * Only unblank the console if we are called in enabled 249 * context or a bust_spinlocks cleared the way for us. 250 */ 251 console_unblank(); 252 _machine_halt(); 253 } 254 255 void machine_power_off(void) 256 { 257 if (!in_interrupt() || oops_in_progress) 258 /* 259 * Only unblank the console if we are called in enabled 260 * context or a bust_spinlocks cleared the way for us. 261 */ 262 console_unblank(); 263 _machine_power_off(); 264 } 265 266 /* 267 * Dummy power off function. 268 */ 269 void (*pm_power_off)(void) = machine_power_off; 270 EXPORT_SYMBOL_GPL(pm_power_off); 271 272 static int __init early_parse_mem(char *p) 273 { 274 memory_end = memparse(p, &p); 275 memory_end &= PAGE_MASK; 276 memory_end_set = 1; 277 return 0; 278 } 279 early_param("mem", early_parse_mem); 280 281 static int __init parse_vmalloc(char *arg) 282 { 283 if (!arg) 284 return -EINVAL; 285 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 286 return 0; 287 } 288 early_param("vmalloc", parse_vmalloc); 289 290 void *restart_stack __attribute__((__section__(".data"))); 291 292 static void __init setup_lowcore(void) 293 { 294 struct _lowcore *lc; 295 296 /* 297 * Setup lowcore for boot cpu 298 */ 299 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); 300 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 301 lc->restart_psw.mask = PSW_KERNEL_BITS; 302 lc->restart_psw.addr = 303 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 304 lc->external_new_psw.mask = PSW_KERNEL_BITS | 305 PSW_MASK_DAT | PSW_MASK_MCHECK; 306 lc->external_new_psw.addr = 307 PSW_ADDR_AMODE | (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 = PSW_ADDR_AMODE | (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 = 314 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler; 315 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 316 lc->mcck_new_psw.addr = 317 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 318 lc->io_new_psw.mask = PSW_KERNEL_BITS | 319 PSW_MASK_DAT | PSW_MASK_MCHECK; 320 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 321 lc->clock_comparator = -1ULL; 322 lc->kernel_stack = ((unsigned long) &init_thread_union) 323 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 324 lc->async_stack = (unsigned long) 325 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) 326 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 327 lc->panic_stack = (unsigned long) 328 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) 329 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 330 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 331 lc->thread_info = (unsigned long) &init_thread_union; 332 lc->machine_flags = S390_lowcore.machine_flags; 333 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 334 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 335 MAX_FACILITY_BIT/8); 336 #ifndef CONFIG_64BIT 337 if (MACHINE_HAS_IEEE) { 338 lc->extended_save_area_addr = (__u32) 339 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0); 340 /* enable extended save area */ 341 __ctl_set_bit(14, 29); 342 } 343 #else 344 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 345 #endif 346 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 347 lc->async_enter_timer = S390_lowcore.async_enter_timer; 348 lc->exit_timer = S390_lowcore.exit_timer; 349 lc->user_timer = S390_lowcore.user_timer; 350 lc->system_timer = S390_lowcore.system_timer; 351 lc->steal_timer = S390_lowcore.steal_timer; 352 lc->last_update_timer = S390_lowcore.last_update_timer; 353 lc->last_update_clock = S390_lowcore.last_update_clock; 354 lc->ftrace_func = S390_lowcore.ftrace_func; 355 356 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 357 restart_stack += ASYNC_SIZE; 358 359 /* 360 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 361 * restart data to the absolute zero lowcore. This is necessary if 362 * PSW restart is done on an offline CPU that has lowcore zero. 363 */ 364 lc->restart_stack = (unsigned long) restart_stack; 365 lc->restart_fn = (unsigned long) do_restart; 366 lc->restart_data = 0; 367 lc->restart_source = -1UL; 368 369 /* Setup absolute zero lowcore */ 370 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 371 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 372 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 373 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 374 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 375 376 #ifdef CONFIG_SMP 377 lc->spinlock_lockval = arch_spin_lockval(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_MEM, 387 }; 388 389 static struct resource data_resource = { 390 .name = "Kernel data", 391 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 392 }; 393 394 static struct resource bss_resource = { 395 .name = "Kernel bss", 396 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 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 = alloc_bootmem_low(sizeof(*res)); 420 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 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 = alloc_bootmem_low(sizeof(*sub_res)); 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 } 444 445 static void __init setup_memory_end(void) 446 { 447 unsigned long vmax, vmalloc_size, tmp; 448 449 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 450 #ifdef CONFIG_64BIT 451 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 452 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 453 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size; 454 if (tmp <= (1UL << 42)) 455 vmax = 1UL << 42; /* 3-level kernel page table */ 456 else 457 vmax = 1UL << 53; /* 4-level kernel page table */ 458 /* module area is at the end of the kernel address space. */ 459 MODULES_END = vmax; 460 MODULES_VADDR = MODULES_END - MODULES_LEN; 461 VMALLOC_END = MODULES_VADDR; 462 #else 463 vmalloc_size = VMALLOC_END ?: 96UL << 20; 464 vmax = 1UL << 31; /* 2-level kernel page table */ 465 /* vmalloc area is at the end of the kernel address space. */ 466 VMALLOC_END = vmax; 467 #endif 468 VMALLOC_START = vmax - vmalloc_size; 469 470 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 471 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 472 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 473 tmp = SECTION_ALIGN_UP(tmp); 474 tmp = VMALLOC_START - tmp * sizeof(struct page); 475 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 476 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 477 vmemmap = (struct page *) tmp; 478 479 /* Take care that memory_end is set and <= vmemmap */ 480 memory_end = min(memory_end ?: max_physmem_end, tmp); 481 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 482 memblock_remove(memory_end, ULONG_MAX); 483 484 pr_notice("Max memory size: %luMB\n", memory_end >> 20); 485 } 486 487 static void __init setup_vmcoreinfo(void) 488 { 489 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 490 } 491 492 #ifdef CONFIG_CRASH_DUMP 493 494 /* 495 * When kdump is enabled, we have to ensure that no memory from 496 * the area [0 - crashkernel memory size] and 497 * [crashk_res.start - crashk_res.end] is set offline. 498 */ 499 static int kdump_mem_notifier(struct notifier_block *nb, 500 unsigned long action, void *data) 501 { 502 struct memory_notify *arg = data; 503 504 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 505 return NOTIFY_BAD; 506 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 507 return NOTIFY_OK; 508 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 509 return NOTIFY_OK; 510 return NOTIFY_BAD; 511 } 512 513 static struct notifier_block kdump_mem_nb = { 514 .notifier_call = kdump_mem_notifier, 515 }; 516 517 #endif 518 519 /* 520 * Make sure that the area behind memory_end is protected 521 */ 522 static void reserve_memory_end(void) 523 { 524 #ifdef CONFIG_CRASH_DUMP 525 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 526 !OLDMEM_BASE && sclp_get_hsa_size()) { 527 memory_end = sclp_get_hsa_size(); 528 memory_end &= PAGE_MASK; 529 memory_end_set = 1; 530 } 531 #endif 532 if (!memory_end_set) 533 return; 534 memblock_reserve(memory_end, ULONG_MAX); 535 } 536 537 /* 538 * Make sure that oldmem, where the dump is stored, is protected 539 */ 540 static void reserve_oldmem(void) 541 { 542 #ifdef CONFIG_CRASH_DUMP 543 if (OLDMEM_BASE) 544 /* Forget all memory above the running kdump system */ 545 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 546 #endif 547 } 548 549 /* 550 * Make sure that oldmem, where the dump is stored, is protected 551 */ 552 static void remove_oldmem(void) 553 { 554 #ifdef CONFIG_CRASH_DUMP 555 if (OLDMEM_BASE) 556 /* Forget all memory above the running kdump system */ 557 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 558 #endif 559 } 560 561 /* 562 * Reserve memory for kdump kernel to be loaded with kexec 563 */ 564 static void __init reserve_crashkernel(void) 565 { 566 #ifdef CONFIG_CRASH_DUMP 567 unsigned long long crash_base, crash_size; 568 phys_addr_t low, high; 569 int rc; 570 571 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 572 &crash_base); 573 574 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 575 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 576 if (rc || crash_size == 0) 577 return; 578 579 if (memblock.memory.regions[0].size < crash_size) { 580 pr_info("crashkernel reservation failed: %s\n", 581 "first memory chunk must be at least crashkernel size"); 582 return; 583 } 584 585 low = crash_base ?: OLDMEM_BASE; 586 high = low + crash_size; 587 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 588 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 589 crash_base = low; 590 } else { 591 /* Find suitable area in free memory */ 592 low = max_t(unsigned long, crash_size, sclp_get_hsa_size()); 593 high = crash_base ? crash_base + crash_size : ULONG_MAX; 594 595 if (crash_base && crash_base < low) { 596 pr_info("crashkernel reservation failed: %s\n", 597 "crash_base too low"); 598 return; 599 } 600 low = crash_base ?: low; 601 crash_base = memblock_find_in_range(low, high, crash_size, 602 KEXEC_CRASH_MEM_ALIGN); 603 } 604 605 if (!crash_base) { 606 pr_info("crashkernel reservation failed: %s\n", 607 "no suitable area found"); 608 return; 609 } 610 611 if (register_memory_notifier(&kdump_mem_nb)) 612 return; 613 614 if (!OLDMEM_BASE && MACHINE_IS_VM) 615 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 616 crashk_res.start = crash_base; 617 crashk_res.end = crash_base + crash_size - 1; 618 insert_resource(&iomem_resource, &crashk_res); 619 memblock_remove(crash_base, crash_size); 620 pr_info("Reserving %lluMB of memory at %lluMB " 621 "for crashkernel (System RAM: %luMB)\n", 622 crash_size >> 20, crash_base >> 20, 623 (unsigned long)memblock.memory.total_size >> 20); 624 os_info_crashkernel_add(crash_base, crash_size); 625 #endif 626 } 627 628 /* 629 * Reserve the initrd from being used by memblock 630 */ 631 static void __init reserve_initrd(void) 632 { 633 #ifdef CONFIG_BLK_DEV_INITRD 634 initrd_start = INITRD_START; 635 initrd_end = initrd_start + INITRD_SIZE; 636 memblock_reserve(INITRD_START, INITRD_SIZE); 637 #endif 638 } 639 640 /* 641 * Check for initrd being in usable memory 642 */ 643 static void __init check_initrd(void) 644 { 645 #ifdef CONFIG_BLK_DEV_INITRD 646 if (INITRD_START && INITRD_SIZE && 647 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 648 pr_err("initrd does not fit memory.\n"); 649 memblock_free(INITRD_START, INITRD_SIZE); 650 initrd_start = initrd_end = 0; 651 } 652 #endif 653 } 654 655 /* 656 * Reserve all kernel text 657 */ 658 static void __init reserve_kernel(void) 659 { 660 unsigned long start_pfn; 661 start_pfn = PFN_UP(__pa(&_end)); 662 663 /* 664 * Reserve memory used for lowcore/command line/kernel image. 665 */ 666 memblock_reserve(0, (unsigned long)_ehead); 667 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 668 - (unsigned long)_stext); 669 } 670 671 static void __init reserve_elfcorehdr(void) 672 { 673 #ifdef CONFIG_CRASH_DUMP 674 if (is_kdump_kernel()) 675 memblock_reserve(elfcorehdr_addr - OLDMEM_BASE, 676 PAGE_ALIGN(elfcorehdr_size)); 677 #endif 678 } 679 680 static void __init setup_memory(void) 681 { 682 struct memblock_region *reg; 683 684 /* 685 * Init storage key for present memory 686 */ 687 for_each_memblock(memory, reg) { 688 storage_key_init_range(reg->base, reg->base + reg->size); 689 } 690 psw_set_key(PAGE_DEFAULT_KEY); 691 692 /* Only cosmetics */ 693 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 694 } 695 696 /* 697 * Setup hardware capabilities. 698 */ 699 static void __init setup_hwcaps(void) 700 { 701 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 702 struct cpuid cpu_id; 703 int i; 704 705 /* 706 * The store facility list bits numbers as found in the principles 707 * of operation are numbered with bit 1UL<<31 as number 0 to 708 * bit 1UL<<0 as number 31. 709 * Bit 0: instructions named N3, "backported" to esa-mode 710 * Bit 2: z/Architecture mode is active 711 * Bit 7: the store-facility-list-extended facility is installed 712 * Bit 17: the message-security assist is installed 713 * Bit 19: the long-displacement facility is installed 714 * Bit 21: the extended-immediate facility is installed 715 * Bit 22: extended-translation facility 3 is installed 716 * Bit 30: extended-translation facility 3 enhancement facility 717 * These get translated to: 718 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 719 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 720 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 721 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 722 */ 723 for (i = 0; i < 6; i++) 724 if (test_facility(stfl_bits[i])) 725 elf_hwcap |= 1UL << i; 726 727 if (test_facility(22) && test_facility(30)) 728 elf_hwcap |= HWCAP_S390_ETF3EH; 729 730 /* 731 * Check for additional facilities with store-facility-list-extended. 732 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 733 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 734 * as stored by stfl, bits 32-xxx contain additional facilities. 735 * How many facility words are stored depends on the number of 736 * doublewords passed to the instruction. The additional facilities 737 * are: 738 * Bit 42: decimal floating point facility is installed 739 * Bit 44: perform floating point operation facility is installed 740 * translated to: 741 * HWCAP_S390_DFP bit 6 (42 && 44). 742 */ 743 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 744 elf_hwcap |= HWCAP_S390_DFP; 745 746 /* 747 * Huge page support HWCAP_S390_HPAGE is bit 7. 748 */ 749 if (MACHINE_HAS_HPAGE) 750 elf_hwcap |= HWCAP_S390_HPAGE; 751 752 #if defined(CONFIG_64BIT) 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 (test_facility(50) && test_facility(73)) 763 elf_hwcap |= HWCAP_S390_TE; 764 #endif 765 766 get_cpu_id(&cpu_id); 767 switch (cpu_id.machine) { 768 case 0x9672: 769 #if !defined(CONFIG_64BIT) 770 default: /* Use "g5" as default for 31 bit kernels. */ 771 #endif 772 strcpy(elf_platform, "g5"); 773 break; 774 case 0x2064: 775 case 0x2066: 776 #if defined(CONFIG_64BIT) 777 default: /* Use "z900" as default for 64 bit kernels. */ 778 #endif 779 strcpy(elf_platform, "z900"); 780 break; 781 case 0x2084: 782 case 0x2086: 783 strcpy(elf_platform, "z990"); 784 break; 785 case 0x2094: 786 case 0x2096: 787 strcpy(elf_platform, "z9-109"); 788 break; 789 case 0x2097: 790 case 0x2098: 791 strcpy(elf_platform, "z10"); 792 break; 793 case 0x2817: 794 case 0x2818: 795 strcpy(elf_platform, "z196"); 796 break; 797 case 0x2827: 798 case 0x2828: 799 strcpy(elf_platform, "zEC12"); 800 break; 801 } 802 } 803 804 /* 805 * Setup function called from init/main.c just after the banner 806 * was printed. 807 */ 808 809 void __init setup_arch(char **cmdline_p) 810 { 811 /* 812 * print what head.S has found out about the machine 813 */ 814 #ifndef CONFIG_64BIT 815 if (MACHINE_IS_VM) 816 pr_info("Linux is running as a z/VM " 817 "guest operating system in 31-bit mode\n"); 818 else if (MACHINE_IS_LPAR) 819 pr_info("Linux is running natively in 31-bit mode\n"); 820 if (MACHINE_HAS_IEEE) 821 pr_info("The hardware system has IEEE compatible " 822 "floating point units\n"); 823 else 824 pr_info("The hardware system has no IEEE compatible " 825 "floating point units\n"); 826 #else /* CONFIG_64BIT */ 827 if (MACHINE_IS_VM) 828 pr_info("Linux is running as a z/VM " 829 "guest operating system in 64-bit mode\n"); 830 else if (MACHINE_IS_KVM) 831 pr_info("Linux is running under KVM in 64-bit mode\n"); 832 else if (MACHINE_IS_LPAR) 833 pr_info("Linux is running natively in 64-bit mode\n"); 834 #endif /* CONFIG_64BIT */ 835 836 /* Have one command line that is parsed and saved in /proc/cmdline */ 837 /* boot_command_line has been already set up in early.c */ 838 *cmdline_p = boot_command_line; 839 840 ROOT_DEV = Root_RAM0; 841 842 /* Is init_mm really needed? */ 843 init_mm.start_code = PAGE_OFFSET; 844 init_mm.end_code = (unsigned long) &_etext; 845 init_mm.end_data = (unsigned long) &_edata; 846 init_mm.brk = (unsigned long) &_end; 847 848 parse_early_param(); 849 os_info_init(); 850 setup_ipl(); 851 852 /* Do some memory reservations *before* memory is added to memblock */ 853 reserve_memory_end(); 854 reserve_oldmem(); 855 reserve_kernel(); 856 reserve_initrd(); 857 reserve_elfcorehdr(); 858 memblock_allow_resize(); 859 860 /* Get information about *all* installed memory */ 861 detect_memory_memblock(); 862 863 remove_oldmem(); 864 865 /* 866 * Make sure all chunks are MAX_ORDER aligned so we don't need the 867 * extra checks that HOLES_IN_ZONE would require. 868 * 869 * Is this still required? 870 */ 871 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 872 873 setup_memory_end(); 874 setup_memory(); 875 876 check_initrd(); 877 reserve_crashkernel(); 878 879 setup_resources(); 880 setup_vmcoreinfo(); 881 setup_lowcore(); 882 smp_fill_possible_mask(); 883 cpu_init(); 884 s390_init_cpu_topology(); 885 886 /* 887 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 888 */ 889 setup_hwcaps(); 890 891 /* 892 * Create kernel page tables and switch to virtual addressing. 893 */ 894 paging_init(); 895 896 /* Setup default console */ 897 conmode_default(); 898 set_preferred_console(); 899 900 /* Setup zfcpdump support */ 901 setup_zfcpdump(); 902 } 903 904 #ifdef CONFIG_32BIT 905 static int no_removal_warning __initdata; 906 907 static int __init parse_no_removal_warning(char *str) 908 { 909 no_removal_warning = 1; 910 return 0; 911 } 912 __setup("no_removal_warning", parse_no_removal_warning); 913 914 static int __init removal_warning(void) 915 { 916 if (no_removal_warning) 917 return 0; 918 printk(KERN_ALERT "\n\n"); 919 printk(KERN_CONT "Warning - you are using a 31 bit kernel!\n\n"); 920 printk(KERN_CONT "We plan to remove 31 bit kernel support from the kernel sources in March 2015.\n"); 921 printk(KERN_CONT "Currently we assume that nobody is using the 31 bit kernel on old 31 bit\n"); 922 printk(KERN_CONT "hardware anymore. If you think that the code should not be removed and also\n"); 923 printk(KERN_CONT "future versions of the Linux kernel should be able to run in 31 bit mode\n"); 924 printk(KERN_CONT "please let us know. Please write to:\n"); 925 printk(KERN_CONT "linux390@de.ibm.com (mail address) and/or\n"); 926 printk(KERN_CONT "linux-s390@vger.kernel.org (mailing list).\n\n"); 927 printk(KERN_CONT "Thank you!\n\n"); 928 printk(KERN_CONT "If this kernel runs on a 64 bit machine you may consider using a 64 bit kernel.\n"); 929 printk(KERN_CONT "This message can be disabled with the \"no_removal_warning\" kernel parameter.\n"); 930 schedule_timeout_uninterruptible(300 * HZ); 931 return 0; 932 } 933 early_initcall(removal_warning); 934 #endif 935