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 */ 71unsigned int console_mode = 0; 72EXPORT_SYMBOL(console_mode); 73 74unsigned int console_devno = -1; 75EXPORT_SYMBOL(console_devno); 76 77unsigned int console_irq = -1; 78EXPORT_SYMBOL(console_irq); 79 80unsigned long elf_hwcap = 0; 81char elf_platform[ELF_PLATFORM_SIZE]; 82 83int __initdata memory_end_set; 84unsigned long __initdata memory_end; 85unsigned long __initdata max_physmem_end; 86 87unsigned long VMALLOC_START; 88EXPORT_SYMBOL(VMALLOC_START); 89 90unsigned long VMALLOC_END; 91EXPORT_SYMBOL(VMALLOC_END); 92 93struct page *vmemmap; 94EXPORT_SYMBOL(vmemmap); 95 96#ifdef CONFIG_64BIT 97unsigned long MODULES_VADDR; 98unsigned long MODULES_END; 99#endif 100 101/* An array with a pointer to the lowcore of every CPU. */ 102struct _lowcore *lowcore_ptr[NR_CPUS]; 103EXPORT_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 117static 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 131static 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 146static 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 166static 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 217static 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 227static 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 235void 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 246void 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 257void 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 */ 271void (*pm_power_off)(void) = machine_power_off; 272EXPORT_SYMBOL_GPL(pm_power_off); 273 274static 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} 281early_param("mem", early_parse_mem); 282 283static 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} 290early_param("vmalloc", parse_vmalloc); 291 292void *restart_stack __attribute__((__section__(".data"))); 293 294static 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 if (MACHINE_HAS_VX) 347 lc->vector_save_area_addr = 348 (unsigned long) &lc->vector_save_area; 349 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 350#endif 351 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 352 lc->async_enter_timer = S390_lowcore.async_enter_timer; 353 lc->exit_timer = S390_lowcore.exit_timer; 354 lc->user_timer = S390_lowcore.user_timer; 355 lc->system_timer = S390_lowcore.system_timer; 356 lc->steal_timer = S390_lowcore.steal_timer; 357 lc->last_update_timer = S390_lowcore.last_update_timer; 358 lc->last_update_clock = S390_lowcore.last_update_clock; 359 lc->ftrace_func = S390_lowcore.ftrace_func; 360 361 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 362 restart_stack += ASYNC_SIZE; 363 364 /* 365 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 366 * restart data to the absolute zero lowcore. This is necessary if 367 * PSW restart is done on an offline CPU that has lowcore zero. 368 */ 369 lc->restart_stack = (unsigned long) restart_stack; 370 lc->restart_fn = (unsigned long) do_restart; 371 lc->restart_data = 0; 372 lc->restart_source = -1UL; 373 374 /* Setup absolute zero lowcore */ 375 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 376 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 377 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 378 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 379 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 380 381#ifdef CONFIG_SMP 382 lc->spinlock_lockval = arch_spin_lockval(0); 383#endif 384 385 set_prefix((u32)(unsigned long) lc); 386 lowcore_ptr[0] = lc; 387} 388 389static struct resource code_resource = { 390 .name = "Kernel code", 391 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 392}; 393 394static struct resource data_resource = { 395 .name = "Kernel data", 396 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 397}; 398 399static struct resource bss_resource = { 400 .name = "Kernel bss", 401 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 402}; 403 404static struct resource __initdata *standard_resources[] = { 405 &code_resource, 406 &data_resource, 407 &bss_resource, 408}; 409 410static void __init setup_resources(void) 411{ 412 struct resource *res, *std_res, *sub_res; 413 struct memblock_region *reg; 414 int j; 415 416 code_resource.start = (unsigned long) &_text; 417 code_resource.end = (unsigned long) &_etext - 1; 418 data_resource.start = (unsigned long) &_etext; 419 data_resource.end = (unsigned long) &_edata - 1; 420 bss_resource.start = (unsigned long) &__bss_start; 421 bss_resource.end = (unsigned long) &__bss_stop - 1; 422 423 for_each_memblock(memory, reg) { 424 res = alloc_bootmem_low(sizeof(*res)); 425 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 426 427 res->name = "System RAM"; 428 res->start = reg->base; 429 res->end = reg->base + reg->size - 1; 430 request_resource(&iomem_resource, res); 431 432 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 433 std_res = standard_resources[j]; 434 if (std_res->start < res->start || 435 std_res->start > res->end) 436 continue; 437 if (std_res->end > res->end) { 438 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 439 *sub_res = *std_res; 440 sub_res->end = res->end; 441 std_res->start = res->end + 1; 442 request_resource(res, sub_res); 443 } else { 444 request_resource(res, std_res); 445 } 446 } 447 } 448} 449 450static void __init setup_memory_end(void) 451{ 452 unsigned long vmax, vmalloc_size, tmp; 453 454 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 455#ifdef CONFIG_64BIT 456 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 457 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 458 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 459 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42)) 460 vmax = 1UL << 42; /* 3-level kernel page table */ 461 else 462 vmax = 1UL << 53; /* 4-level kernel page table */ 463 /* module area is at the end of the kernel address space. */ 464 MODULES_END = vmax; 465 MODULES_VADDR = MODULES_END - MODULES_LEN; 466 VMALLOC_END = MODULES_VADDR; 467#else 468 vmalloc_size = VMALLOC_END ?: 96UL << 20; 469 vmax = 1UL << 31; /* 2-level kernel page table */ 470 /* vmalloc area is at the end of the kernel address space. */ 471 VMALLOC_END = vmax; 472#endif 473 VMALLOC_START = vmax - vmalloc_size; 474 475 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 476 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 477 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 478 tmp = SECTION_ALIGN_UP(tmp); 479 tmp = VMALLOC_START - tmp * sizeof(struct page); 480 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 481 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 482 vmemmap = (struct page *) tmp; 483 484 /* Take care that memory_end is set and <= vmemmap */ 485 memory_end = min(memory_end ?: max_physmem_end, tmp); 486 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 487 memblock_remove(memory_end, ULONG_MAX); 488 489 pr_notice("Max memory size: %luMB\n", memory_end >> 20); 490} 491 492static void __init setup_vmcoreinfo(void) 493{ 494 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 495} 496 497#ifdef CONFIG_CRASH_DUMP 498 499/* 500 * When kdump is enabled, we have to ensure that no memory from 501 * the area [0 - crashkernel memory size] and 502 * [crashk_res.start - crashk_res.end] is set offline. 503 */ 504static int kdump_mem_notifier(struct notifier_block *nb, 505 unsigned long action, void *data) 506{ 507 struct memory_notify *arg = data; 508 509 if (action != MEM_GOING_OFFLINE) 510 return NOTIFY_OK; 511 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 512 return NOTIFY_BAD; 513 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 514 return NOTIFY_OK; 515 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 516 return NOTIFY_OK; 517 return NOTIFY_BAD; 518} 519 520static struct notifier_block kdump_mem_nb = { 521 .notifier_call = kdump_mem_notifier, 522}; 523 524#endif 525 526/* 527 * Make sure that the area behind memory_end is protected 528 */ 529static void reserve_memory_end(void) 530{ 531#ifdef CONFIG_CRASH_DUMP 532 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 533 !OLDMEM_BASE && sclp_get_hsa_size()) { 534 memory_end = sclp_get_hsa_size(); 535 memory_end &= PAGE_MASK; 536 memory_end_set = 1; 537 } 538#endif 539 if (!memory_end_set) 540 return; 541 memblock_reserve(memory_end, ULONG_MAX); 542} 543 544/* 545 * Make sure that oldmem, where the dump is stored, is protected 546 */ 547static void reserve_oldmem(void) 548{ 549#ifdef CONFIG_CRASH_DUMP 550 if (OLDMEM_BASE) 551 /* Forget all memory above the running kdump system */ 552 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 553#endif 554} 555 556/* 557 * Make sure that oldmem, where the dump is stored, is protected 558 */ 559static void remove_oldmem(void) 560{ 561#ifdef CONFIG_CRASH_DUMP 562 if (OLDMEM_BASE) 563 /* Forget all memory above the running kdump system */ 564 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 565#endif 566} 567 568/* 569 * Reserve memory for kdump kernel to be loaded with kexec 570 */ 571static void __init reserve_crashkernel(void) 572{ 573#ifdef CONFIG_CRASH_DUMP 574 unsigned long long crash_base, crash_size; 575 phys_addr_t low, high; 576 int rc; 577 578 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 579 &crash_base); 580 581 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 582 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 583 if (rc || crash_size == 0) 584 return; 585 586 if (memblock.memory.regions[0].size < crash_size) { 587 pr_info("crashkernel reservation failed: %s\n", 588 "first memory chunk must be at least crashkernel size"); 589 return; 590 } 591 592 low = crash_base ?: OLDMEM_BASE; 593 high = low + crash_size; 594 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 595 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 596 crash_base = low; 597 } else { 598 /* Find suitable area in free memory */ 599 low = max_t(unsigned long, crash_size, sclp_get_hsa_size()); 600 high = crash_base ? crash_base + crash_size : ULONG_MAX; 601 602 if (crash_base && crash_base < low) { 603 pr_info("crashkernel reservation failed: %s\n", 604 "crash_base too low"); 605 return; 606 } 607 low = crash_base ?: low; 608 crash_base = memblock_find_in_range(low, high, crash_size, 609 KEXEC_CRASH_MEM_ALIGN); 610 } 611 612 if (!crash_base) { 613 pr_info("crashkernel reservation failed: %s\n", 614 "no suitable area found"); 615 return; 616 } 617 618 if (register_memory_notifier(&kdump_mem_nb)) 619 return; 620 621 if (!OLDMEM_BASE && MACHINE_IS_VM) 622 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 623 crashk_res.start = crash_base; 624 crashk_res.end = crash_base + crash_size - 1; 625 insert_resource(&iomem_resource, &crashk_res); 626 memblock_remove(crash_base, crash_size); 627 pr_info("Reserving %lluMB of memory at %lluMB " 628 "for crashkernel (System RAM: %luMB)\n", 629 crash_size >> 20, crash_base >> 20, 630 (unsigned long)memblock.memory.total_size >> 20); 631 os_info_crashkernel_add(crash_base, crash_size); 632#endif 633} 634 635/* 636 * Reserve the initrd from being used by memblock 637 */ 638static void __init reserve_initrd(void) 639{ 640#ifdef CONFIG_BLK_DEV_INITRD 641 initrd_start = INITRD_START; 642 initrd_end = initrd_start + INITRD_SIZE; 643 memblock_reserve(INITRD_START, INITRD_SIZE); 644#endif 645} 646 647/* 648 * Check for initrd being in usable memory 649 */ 650static void __init check_initrd(void) 651{ 652#ifdef CONFIG_BLK_DEV_INITRD 653 if (INITRD_START && INITRD_SIZE && 654 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 655 pr_err("initrd does not fit memory.\n"); 656 memblock_free(INITRD_START, INITRD_SIZE); 657 initrd_start = initrd_end = 0; 658 } 659#endif 660} 661 662/* 663 * Reserve all kernel text 664 */ 665static void __init reserve_kernel(void) 666{ 667 unsigned long start_pfn; 668 start_pfn = PFN_UP(__pa(&_end)); 669 670 /* 671 * Reserve memory used for lowcore/command line/kernel image. 672 */ 673 memblock_reserve(0, (unsigned long)_ehead); 674 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 675 - (unsigned long)_stext); 676} 677 678static void __init reserve_elfcorehdr(void) 679{ 680#ifdef CONFIG_CRASH_DUMP 681 if (is_kdump_kernel()) 682 memblock_reserve(elfcorehdr_addr - OLDMEM_BASE, 683 PAGE_ALIGN(elfcorehdr_size)); 684#endif 685} 686 687static void __init setup_memory(void) 688{ 689 struct memblock_region *reg; 690 691 /* 692 * Init storage key for present memory 693 */ 694 for_each_memblock(memory, reg) { 695 storage_key_init_range(reg->base, reg->base + reg->size); 696 } 697 psw_set_key(PAGE_DEFAULT_KEY); 698 699 /* Only cosmetics */ 700 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 701} 702 703/* 704 * Setup hardware capabilities. 705 */ 706static void __init setup_hwcaps(void) 707{ 708 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 709 struct cpuid cpu_id; 710 int i; 711 712 /* 713 * The store facility list bits numbers as found in the principles 714 * of operation are numbered with bit 1UL<<31 as number 0 to 715 * bit 1UL<<0 as number 31. 716 * Bit 0: instructions named N3, "backported" to esa-mode 717 * Bit 2: z/Architecture mode is active 718 * Bit 7: the store-facility-list-extended facility is installed 719 * Bit 17: the message-security assist is installed 720 * Bit 19: the long-displacement facility is installed 721 * Bit 21: the extended-immediate facility is installed 722 * Bit 22: extended-translation facility 3 is installed 723 * Bit 30: extended-translation facility 3 enhancement facility 724 * These get translated to: 725 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 726 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 727 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 728 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 729 */ 730 for (i = 0; i < 6; i++) 731 if (test_facility(stfl_bits[i])) 732 elf_hwcap |= 1UL << i; 733 734 if (test_facility(22) && test_facility(30)) 735 elf_hwcap |= HWCAP_S390_ETF3EH; 736 737 /* 738 * Check for additional facilities with store-facility-list-extended. 739 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 740 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 741 * as stored by stfl, bits 32-xxx contain additional facilities. 742 * How many facility words are stored depends on the number of 743 * doublewords passed to the instruction. The additional facilities 744 * are: 745 * Bit 42: decimal floating point facility is installed 746 * Bit 44: perform floating point operation facility is installed 747 * translated to: 748 * HWCAP_S390_DFP bit 6 (42 && 44). 749 */ 750 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 751 elf_hwcap |= HWCAP_S390_DFP; 752 753 /* 754 * Huge page support HWCAP_S390_HPAGE is bit 7. 755 */ 756 if (MACHINE_HAS_HPAGE) 757 elf_hwcap |= HWCAP_S390_HPAGE; 758 759#if defined(CONFIG_64BIT) 760 /* 761 * 64-bit register support for 31-bit processes 762 * HWCAP_S390_HIGH_GPRS is bit 9. 763 */ 764 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 765 766 /* 767 * Transactional execution support HWCAP_S390_TE is bit 10. 768 */ 769 if (test_facility(50) && test_facility(73)) 770 elf_hwcap |= HWCAP_S390_TE; 771 772 /* 773 * Vector extension HWCAP_S390_VXRS is bit 11. 774 */ 775 if (test_facility(129)) 776 elf_hwcap |= HWCAP_S390_VXRS; 777#endif 778 779 get_cpu_id(&cpu_id); 780 add_device_randomness(&cpu_id, sizeof(cpu_id)); 781 switch (cpu_id.machine) { 782 case 0x9672: 783#if !defined(CONFIG_64BIT) 784 default: /* Use "g5" as default for 31 bit kernels. */ 785#endif 786 strcpy(elf_platform, "g5"); 787 break; 788 case 0x2064: 789 case 0x2066: 790#if defined(CONFIG_64BIT) 791 default: /* Use "z900" as default for 64 bit kernels. */ 792#endif 793 strcpy(elf_platform, "z900"); 794 break; 795 case 0x2084: 796 case 0x2086: 797 strcpy(elf_platform, "z990"); 798 break; 799 case 0x2094: 800 case 0x2096: 801 strcpy(elf_platform, "z9-109"); 802 break; 803 case 0x2097: 804 case 0x2098: 805 strcpy(elf_platform, "z10"); 806 break; 807 case 0x2817: 808 case 0x2818: 809 strcpy(elf_platform, "z196"); 810 break; 811 case 0x2827: 812 case 0x2828: 813 strcpy(elf_platform, "zEC12"); 814 break; 815 } 816} 817 818/* 819 * Add system information as device randomness 820 */ 821static void __init setup_randomness(void) 822{ 823 struct sysinfo_3_2_2 *vmms; 824 825 vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL); 826 if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count) 827 add_device_randomness(&vmms, vmms->count); 828 free_page((unsigned long) vmms); 829} 830 831/* 832 * Setup function called from init/main.c just after the banner 833 * was printed. 834 */ 835 836void __init setup_arch(char **cmdline_p) 837{ 838 /* 839 * print what head.S has found out about the machine 840 */ 841#ifndef CONFIG_64BIT 842 if (MACHINE_IS_VM) 843 pr_info("Linux is running as a z/VM " 844 "guest operating system in 31-bit mode\n"); 845 else if (MACHINE_IS_LPAR) 846 pr_info("Linux is running natively in 31-bit mode\n"); 847 if (MACHINE_HAS_IEEE) 848 pr_info("The hardware system has IEEE compatible " 849 "floating point units\n"); 850 else 851 pr_info("The hardware system has no IEEE compatible " 852 "floating point units\n"); 853#else /* CONFIG_64BIT */ 854 if (MACHINE_IS_VM) 855 pr_info("Linux is running as a z/VM " 856 "guest operating system in 64-bit mode\n"); 857 else if (MACHINE_IS_KVM) 858 pr_info("Linux is running under KVM in 64-bit mode\n"); 859 else if (MACHINE_IS_LPAR) 860 pr_info("Linux is running natively in 64-bit mode\n"); 861#endif /* CONFIG_64BIT */ 862 863 /* Have one command line that is parsed and saved in /proc/cmdline */ 864 /* boot_command_line has been already set up in early.c */ 865 *cmdline_p = boot_command_line; 866 867 ROOT_DEV = Root_RAM0; 868 869 /* Is init_mm really needed? */ 870 init_mm.start_code = PAGE_OFFSET; 871 init_mm.end_code = (unsigned long) &_etext; 872 init_mm.end_data = (unsigned long) &_edata; 873 init_mm.brk = (unsigned long) &_end; 874 875 parse_early_param(); 876 os_info_init(); 877 setup_ipl(); 878 879 /* Do some memory reservations *before* memory is added to memblock */ 880 reserve_memory_end(); 881 reserve_oldmem(); 882 reserve_kernel(); 883 reserve_initrd(); 884 reserve_elfcorehdr(); 885 memblock_allow_resize(); 886 887 /* Get information about *all* installed memory */ 888 detect_memory_memblock(); 889 890 remove_oldmem(); 891 892 /* 893 * Make sure all chunks are MAX_ORDER aligned so we don't need the 894 * extra checks that HOLES_IN_ZONE would require. 895 * 896 * Is this still required? 897 */ 898 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 899 900 setup_memory_end(); 901 setup_memory(); 902 903 check_initrd(); 904 reserve_crashkernel(); 905 906 setup_resources(); 907 setup_vmcoreinfo(); 908 setup_lowcore(); 909 smp_fill_possible_mask(); 910 cpu_init(); 911 s390_init_cpu_topology(); 912 913 /* 914 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 915 */ 916 setup_hwcaps(); 917 918 /* 919 * Create kernel page tables and switch to virtual addressing. 920 */ 921 paging_init(); 922 923 /* Setup default console */ 924 conmode_default(); 925 set_preferred_console(); 926 927 /* Setup zfcpdump support */ 928 setup_zfcpdump(); 929 930 /* Add system specific data to the random pool */ 931 setup_randomness(); 932} 933 934#ifdef CONFIG_32BIT 935static int no_removal_warning __initdata; 936 937static int __init parse_no_removal_warning(char *str) 938{ 939 no_removal_warning = 1; 940 return 0; 941} 942__setup("no_removal_warning", parse_no_removal_warning); 943 944static int __init removal_warning(void) 945{ 946 if (no_removal_warning) 947 return 0; 948 printk(KERN_ALERT "\n\n"); 949 printk(KERN_CONT "Warning - you are using a 31 bit kernel!\n\n"); 950 printk(KERN_CONT "We plan to remove 31 bit kernel support from the kernel sources in March 2015.\n"); 951 printk(KERN_CONT "Currently we assume that nobody is using the 31 bit kernel on old 31 bit\n"); 952 printk(KERN_CONT "hardware anymore. If you think that the code should not be removed and also\n"); 953 printk(KERN_CONT "future versions of the Linux kernel should be able to run in 31 bit mode\n"); 954 printk(KERN_CONT "please let us know. Please write to:\n"); 955 printk(KERN_CONT "linux390@de.ibm.com (mail address) and/or\n"); 956 printk(KERN_CONT "linux-s390@vger.kernel.org (mailing list).\n\n"); 957 printk(KERN_CONT "Thank you!\n\n"); 958 printk(KERN_CONT "If this kernel runs on a 64 bit machine you may consider using a 64 bit kernel.\n"); 959 printk(KERN_CONT "This message can be disabled with the \"no_removal_warning\" kernel parameter.\n"); 960 schedule_timeout_uninterruptible(300 * HZ); 961 return 0; 962} 963early_initcall(removal_warning); 964#endif 965