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 = 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 if (MACHINE_HAS_VX) 339 lc->vector_save_area_addr = 340 (unsigned long) &lc->vector_save_area; 341 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 342 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 343 lc->async_enter_timer = S390_lowcore.async_enter_timer; 344 lc->exit_timer = S390_lowcore.exit_timer; 345 lc->user_timer = S390_lowcore.user_timer; 346 lc->system_timer = S390_lowcore.system_timer; 347 lc->steal_timer = S390_lowcore.steal_timer; 348 lc->last_update_timer = S390_lowcore.last_update_timer; 349 lc->last_update_clock = S390_lowcore.last_update_clock; 350 351 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 352 restart_stack += ASYNC_SIZE; 353 354 /* 355 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 356 * restart data to the absolute zero lowcore. This is necessary if 357 * PSW restart is done on an offline CPU that has lowcore zero. 358 */ 359 lc->restart_stack = (unsigned long) restart_stack; 360 lc->restart_fn = (unsigned long) do_restart; 361 lc->restart_data = 0; 362 lc->restart_source = -1UL; 363 364 /* Setup absolute zero lowcore */ 365 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 366 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 367 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 368 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 369 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 370 371 #ifdef CONFIG_SMP 372 lc->spinlock_lockval = arch_spin_lockval(0); 373 #endif 374 375 set_prefix((u32)(unsigned long) lc); 376 lowcore_ptr[0] = lc; 377 } 378 379 static struct resource code_resource = { 380 .name = "Kernel code", 381 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 382 }; 383 384 static struct resource data_resource = { 385 .name = "Kernel data", 386 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 387 }; 388 389 static struct resource bss_resource = { 390 .name = "Kernel bss", 391 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 392 }; 393 394 static struct resource __initdata *standard_resources[] = { 395 &code_resource, 396 &data_resource, 397 &bss_resource, 398 }; 399 400 static void __init setup_resources(void) 401 { 402 struct resource *res, *std_res, *sub_res; 403 struct memblock_region *reg; 404 int j; 405 406 code_resource.start = (unsigned long) &_text; 407 code_resource.end = (unsigned long) &_etext - 1; 408 data_resource.start = (unsigned long) &_etext; 409 data_resource.end = (unsigned long) &_edata - 1; 410 bss_resource.start = (unsigned long) &__bss_start; 411 bss_resource.end = (unsigned long) &__bss_stop - 1; 412 413 for_each_memblock(memory, reg) { 414 res = alloc_bootmem_low(sizeof(*res)); 415 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 416 417 res->name = "System RAM"; 418 res->start = reg->base; 419 res->end = reg->base + reg->size - 1; 420 request_resource(&iomem_resource, res); 421 422 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 423 std_res = standard_resources[j]; 424 if (std_res->start < res->start || 425 std_res->start > res->end) 426 continue; 427 if (std_res->end > res->end) { 428 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 429 *sub_res = *std_res; 430 sub_res->end = res->end; 431 std_res->start = res->end + 1; 432 request_resource(res, sub_res); 433 } else { 434 request_resource(res, std_res); 435 } 436 } 437 } 438 } 439 440 static void __init setup_memory_end(void) 441 { 442 unsigned long vmax, vmalloc_size, tmp; 443 444 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 445 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 446 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 447 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 448 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42)) 449 vmax = 1UL << 42; /* 3-level kernel page table */ 450 else 451 vmax = 1UL << 53; /* 4-level kernel page table */ 452 /* module area is at the end of the kernel address space. */ 453 MODULES_END = vmax; 454 MODULES_VADDR = MODULES_END - MODULES_LEN; 455 VMALLOC_END = MODULES_VADDR; 456 VMALLOC_START = vmax - vmalloc_size; 457 458 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 459 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 460 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 461 tmp = SECTION_ALIGN_UP(tmp); 462 tmp = VMALLOC_START - tmp * sizeof(struct page); 463 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 464 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 465 vmemmap = (struct page *) tmp; 466 467 /* Take care that memory_end is set and <= vmemmap */ 468 memory_end = min(memory_end ?: max_physmem_end, tmp); 469 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 470 memblock_remove(memory_end, ULONG_MAX); 471 472 pr_notice("Max memory size: %luMB\n", memory_end >> 20); 473 } 474 475 static void __init setup_vmcoreinfo(void) 476 { 477 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 478 } 479 480 #ifdef CONFIG_CRASH_DUMP 481 482 /* 483 * When kdump is enabled, we have to ensure that no memory from 484 * the area [0 - crashkernel memory size] and 485 * [crashk_res.start - crashk_res.end] is set offline. 486 */ 487 static int kdump_mem_notifier(struct notifier_block *nb, 488 unsigned long action, void *data) 489 { 490 struct memory_notify *arg = data; 491 492 if (action != MEM_GOING_OFFLINE) 493 return NOTIFY_OK; 494 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 495 return NOTIFY_BAD; 496 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 497 return NOTIFY_OK; 498 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 499 return NOTIFY_OK; 500 return NOTIFY_BAD; 501 } 502 503 static struct notifier_block kdump_mem_nb = { 504 .notifier_call = kdump_mem_notifier, 505 }; 506 507 #endif 508 509 /* 510 * Make sure that the area behind memory_end is protected 511 */ 512 static void reserve_memory_end(void) 513 { 514 #ifdef CONFIG_CRASH_DUMP 515 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 516 !OLDMEM_BASE && sclp.hsa_size) { 517 memory_end = sclp.hsa_size; 518 memory_end &= PAGE_MASK; 519 memory_end_set = 1; 520 } 521 #endif 522 if (!memory_end_set) 523 return; 524 memblock_reserve(memory_end, ULONG_MAX); 525 } 526 527 /* 528 * Make sure that oldmem, where the dump is stored, is protected 529 */ 530 static void reserve_oldmem(void) 531 { 532 #ifdef CONFIG_CRASH_DUMP 533 if (OLDMEM_BASE) 534 /* Forget all memory above the running kdump system */ 535 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 536 #endif 537 } 538 539 /* 540 * Make sure that oldmem, where the dump is stored, is protected 541 */ 542 static void remove_oldmem(void) 543 { 544 #ifdef CONFIG_CRASH_DUMP 545 if (OLDMEM_BASE) 546 /* Forget all memory above the running kdump system */ 547 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 548 #endif 549 } 550 551 /* 552 * Reserve memory for kdump kernel to be loaded with kexec 553 */ 554 static void __init reserve_crashkernel(void) 555 { 556 #ifdef CONFIG_CRASH_DUMP 557 unsigned long long crash_base, crash_size; 558 phys_addr_t low, high; 559 int rc; 560 561 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 562 &crash_base); 563 564 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 565 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 566 if (rc || crash_size == 0) 567 return; 568 569 if (memblock.memory.regions[0].size < crash_size) { 570 pr_info("crashkernel reservation failed: %s\n", 571 "first memory chunk must be at least crashkernel size"); 572 return; 573 } 574 575 low = crash_base ?: OLDMEM_BASE; 576 high = low + crash_size; 577 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 578 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 579 crash_base = low; 580 } else { 581 /* Find suitable area in free memory */ 582 low = max_t(unsigned long, crash_size, sclp.hsa_size); 583 high = crash_base ? crash_base + crash_size : ULONG_MAX; 584 585 if (crash_base && crash_base < low) { 586 pr_info("crashkernel reservation failed: %s\n", 587 "crash_base too low"); 588 return; 589 } 590 low = crash_base ?: low; 591 crash_base = memblock_find_in_range(low, high, crash_size, 592 KEXEC_CRASH_MEM_ALIGN); 593 } 594 595 if (!crash_base) { 596 pr_info("crashkernel reservation failed: %s\n", 597 "no suitable area found"); 598 return; 599 } 600 601 if (register_memory_notifier(&kdump_mem_nb)) 602 return; 603 604 if (!OLDMEM_BASE && MACHINE_IS_VM) 605 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 606 crashk_res.start = crash_base; 607 crashk_res.end = crash_base + crash_size - 1; 608 insert_resource(&iomem_resource, &crashk_res); 609 memblock_remove(crash_base, crash_size); 610 pr_info("Reserving %lluMB of memory at %lluMB " 611 "for crashkernel (System RAM: %luMB)\n", 612 crash_size >> 20, crash_base >> 20, 613 (unsigned long)memblock.memory.total_size >> 20); 614 os_info_crashkernel_add(crash_base, crash_size); 615 #endif 616 } 617 618 /* 619 * Reserve the initrd from being used by memblock 620 */ 621 static void __init reserve_initrd(void) 622 { 623 #ifdef CONFIG_BLK_DEV_INITRD 624 initrd_start = INITRD_START; 625 initrd_end = initrd_start + INITRD_SIZE; 626 memblock_reserve(INITRD_START, INITRD_SIZE); 627 #endif 628 } 629 630 /* 631 * Check for initrd being in usable memory 632 */ 633 static void __init check_initrd(void) 634 { 635 #ifdef CONFIG_BLK_DEV_INITRD 636 if (INITRD_START && INITRD_SIZE && 637 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 638 pr_err("initrd does not fit memory.\n"); 639 memblock_free(INITRD_START, INITRD_SIZE); 640 initrd_start = initrd_end = 0; 641 } 642 #endif 643 } 644 645 /* 646 * Reserve memory used for lowcore/command line/kernel image. 647 */ 648 static void __init reserve_kernel(void) 649 { 650 unsigned long start_pfn = PFN_UP(__pa(&_end)); 651 652 #ifdef CONFIG_DMA_API_DEBUG 653 /* 654 * DMA_API_DEBUG code stumbles over addresses from the 655 * range [_ehead, _stext]. Mark the memory as reserved 656 * so it is not used for CONFIG_DMA_API_DEBUG=y. 657 */ 658 memblock_reserve(0, PFN_PHYS(start_pfn)); 659 #else 660 memblock_reserve(0, (unsigned long)_ehead); 661 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 662 - (unsigned long)_stext); 663 #endif 664 } 665 666 static void __init setup_memory(void) 667 { 668 struct memblock_region *reg; 669 670 /* 671 * Init storage key for present memory 672 */ 673 for_each_memblock(memory, reg) { 674 storage_key_init_range(reg->base, reg->base + reg->size); 675 } 676 psw_set_key(PAGE_DEFAULT_KEY); 677 678 /* Only cosmetics */ 679 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 680 } 681 682 /* 683 * Setup hardware capabilities. 684 */ 685 static int __init setup_hwcaps(void) 686 { 687 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 688 struct cpuid cpu_id; 689 int i; 690 691 /* 692 * The store facility list bits numbers as found in the principles 693 * of operation are numbered with bit 1UL<<31 as number 0 to 694 * bit 1UL<<0 as number 31. 695 * Bit 0: instructions named N3, "backported" to esa-mode 696 * Bit 2: z/Architecture mode is active 697 * Bit 7: the store-facility-list-extended facility is installed 698 * Bit 17: the message-security assist is installed 699 * Bit 19: the long-displacement facility is installed 700 * Bit 21: the extended-immediate facility is installed 701 * Bit 22: extended-translation facility 3 is installed 702 * Bit 30: extended-translation facility 3 enhancement facility 703 * These get translated to: 704 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 705 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 706 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 707 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 708 */ 709 for (i = 0; i < 6; i++) 710 if (test_facility(stfl_bits[i])) 711 elf_hwcap |= 1UL << i; 712 713 if (test_facility(22) && test_facility(30)) 714 elf_hwcap |= HWCAP_S390_ETF3EH; 715 716 /* 717 * Check for additional facilities with store-facility-list-extended. 718 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 719 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 720 * as stored by stfl, bits 32-xxx contain additional facilities. 721 * How many facility words are stored depends on the number of 722 * doublewords passed to the instruction. The additional facilities 723 * are: 724 * Bit 42: decimal floating point facility is installed 725 * Bit 44: perform floating point operation facility is installed 726 * translated to: 727 * HWCAP_S390_DFP bit 6 (42 && 44). 728 */ 729 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 730 elf_hwcap |= HWCAP_S390_DFP; 731 732 /* 733 * Huge page support HWCAP_S390_HPAGE is bit 7. 734 */ 735 if (MACHINE_HAS_HPAGE) 736 elf_hwcap |= HWCAP_S390_HPAGE; 737 738 /* 739 * 64-bit register support for 31-bit processes 740 * HWCAP_S390_HIGH_GPRS is bit 9. 741 */ 742 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 743 744 /* 745 * Transactional execution support HWCAP_S390_TE is bit 10. 746 */ 747 if (test_facility(50) && test_facility(73)) 748 elf_hwcap |= HWCAP_S390_TE; 749 750 /* 751 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 752 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 753 * instead of facility bit 129. 754 */ 755 if (MACHINE_HAS_VX) 756 elf_hwcap |= HWCAP_S390_VXRS; 757 get_cpu_id(&cpu_id); 758 add_device_randomness(&cpu_id, sizeof(cpu_id)); 759 switch (cpu_id.machine) { 760 case 0x2064: 761 case 0x2066: 762 default: /* Use "z900" as default for 64 bit kernels. */ 763 strcpy(elf_platform, "z900"); 764 break; 765 case 0x2084: 766 case 0x2086: 767 strcpy(elf_platform, "z990"); 768 break; 769 case 0x2094: 770 case 0x2096: 771 strcpy(elf_platform, "z9-109"); 772 break; 773 case 0x2097: 774 case 0x2098: 775 strcpy(elf_platform, "z10"); 776 break; 777 case 0x2817: 778 case 0x2818: 779 strcpy(elf_platform, "z196"); 780 break; 781 case 0x2827: 782 case 0x2828: 783 strcpy(elf_platform, "zEC12"); 784 break; 785 case 0x2964: 786 strcpy(elf_platform, "z13"); 787 break; 788 } 789 790 /* 791 * Virtualization support HWCAP_INT_SIE is bit 0. 792 */ 793 if (sclp.has_sief2) 794 int_hwcap |= HWCAP_INT_SIE; 795 796 return 0; 797 } 798 arch_initcall(setup_hwcaps); 799 800 /* 801 * Add system information as device randomness 802 */ 803 static void __init setup_randomness(void) 804 { 805 struct sysinfo_3_2_2 *vmms; 806 807 vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL); 808 if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count) 809 add_device_randomness(&vmms, vmms->count); 810 free_page((unsigned long) vmms); 811 } 812 813 /* 814 * Setup function called from init/main.c just after the banner 815 * was printed. 816 */ 817 818 void __init setup_arch(char **cmdline_p) 819 { 820 /* 821 * print what head.S has found out about the machine 822 */ 823 if (MACHINE_IS_VM) 824 pr_info("Linux is running as a z/VM " 825 "guest operating system in 64-bit mode\n"); 826 else if (MACHINE_IS_KVM) 827 pr_info("Linux is running under KVM in 64-bit mode\n"); 828 else if (MACHINE_IS_LPAR) 829 pr_info("Linux is running natively in 64-bit mode\n"); 830 831 /* Have one command line that is parsed and saved in /proc/cmdline */ 832 /* boot_command_line has been already set up in early.c */ 833 *cmdline_p = boot_command_line; 834 835 ROOT_DEV = Root_RAM0; 836 837 /* Is init_mm really needed? */ 838 init_mm.start_code = PAGE_OFFSET; 839 init_mm.end_code = (unsigned long) &_etext; 840 init_mm.end_data = (unsigned long) &_edata; 841 init_mm.brk = (unsigned long) &_end; 842 843 parse_early_param(); 844 #ifdef CONFIG_CRASH_DUMP 845 /* Deactivate elfcorehdr= kernel parameter */ 846 elfcorehdr_addr = ELFCORE_ADDR_MAX; 847 #endif 848 849 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 memblock_allow_resize(); 858 859 /* Get information about *all* installed memory */ 860 detect_memory_memblock(); 861 862 remove_oldmem(); 863 864 /* 865 * Make sure all chunks are MAX_ORDER aligned so we don't need the 866 * extra checks that HOLES_IN_ZONE would require. 867 * 868 * Is this still required? 869 */ 870 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 871 872 setup_memory_end(); 873 setup_memory(); 874 875 check_initrd(); 876 reserve_crashkernel(); 877 #ifdef CONFIG_CRASH_DUMP 878 /* 879 * Be aware that smp_save_dump_cpus() triggers a system reset. 880 * Therefore CPU and device initialization should be done afterwards. 881 */ 882 smp_save_dump_cpus(); 883 #endif 884 885 setup_resources(); 886 setup_vmcoreinfo(); 887 setup_lowcore(); 888 smp_fill_possible_mask(); 889 cpu_init(); 890 numa_setup(); 891 892 /* 893 * Create kernel page tables and switch to virtual addressing. 894 */ 895 paging_init(); 896 897 /* Setup default console */ 898 conmode_default(); 899 set_preferred_console(); 900 901 /* Setup zfcpdump support */ 902 setup_zfcpdump(); 903 904 /* Add system specific data to the random pool */ 905 setup_randomness(); 906 } 907