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 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 unsigned long MODULES_VADDR; 97 unsigned long MODULES_END; 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 if (MACHINE_HAS_VX) 337 lc->vector_save_area_addr = 338 (unsigned long) &lc->vector_save_area; 339 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 340 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 341 lc->async_enter_timer = S390_lowcore.async_enter_timer; 342 lc->exit_timer = S390_lowcore.exit_timer; 343 lc->user_timer = S390_lowcore.user_timer; 344 lc->system_timer = S390_lowcore.system_timer; 345 lc->steal_timer = S390_lowcore.steal_timer; 346 lc->last_update_timer = S390_lowcore.last_update_timer; 347 lc->last_update_clock = S390_lowcore.last_update_clock; 348 349 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 350 restart_stack += ASYNC_SIZE; 351 352 /* 353 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 354 * restart data to the absolute zero lowcore. This is necessary if 355 * PSW restart is done on an offline CPU that has lowcore zero. 356 */ 357 lc->restart_stack = (unsigned long) restart_stack; 358 lc->restart_fn = (unsigned long) do_restart; 359 lc->restart_data = 0; 360 lc->restart_source = -1UL; 361 362 /* Setup absolute zero lowcore */ 363 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 364 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 365 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 366 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 367 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 368 369 #ifdef CONFIG_SMP 370 lc->spinlock_lockval = arch_spin_lockval(0); 371 #endif 372 373 set_prefix((u32)(unsigned long) lc); 374 lowcore_ptr[0] = lc; 375 } 376 377 static struct resource code_resource = { 378 .name = "Kernel code", 379 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 380 }; 381 382 static struct resource data_resource = { 383 .name = "Kernel data", 384 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 385 }; 386 387 static struct resource bss_resource = { 388 .name = "Kernel bss", 389 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 390 }; 391 392 static struct resource __initdata *standard_resources[] = { 393 &code_resource, 394 &data_resource, 395 &bss_resource, 396 }; 397 398 static void __init setup_resources(void) 399 { 400 struct resource *res, *std_res, *sub_res; 401 struct memblock_region *reg; 402 int j; 403 404 code_resource.start = (unsigned long) &_text; 405 code_resource.end = (unsigned long) &_etext - 1; 406 data_resource.start = (unsigned long) &_etext; 407 data_resource.end = (unsigned long) &_edata - 1; 408 bss_resource.start = (unsigned long) &__bss_start; 409 bss_resource.end = (unsigned long) &__bss_stop - 1; 410 411 for_each_memblock(memory, reg) { 412 res = alloc_bootmem_low(sizeof(*res)); 413 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 414 415 res->name = "System RAM"; 416 res->start = reg->base; 417 res->end = reg->base + reg->size - 1; 418 request_resource(&iomem_resource, res); 419 420 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 421 std_res = standard_resources[j]; 422 if (std_res->start < res->start || 423 std_res->start > res->end) 424 continue; 425 if (std_res->end > res->end) { 426 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 427 *sub_res = *std_res; 428 sub_res->end = res->end; 429 std_res->start = res->end + 1; 430 request_resource(res, sub_res); 431 } else { 432 request_resource(res, std_res); 433 } 434 } 435 } 436 } 437 438 static void __init setup_memory_end(void) 439 { 440 unsigned long vmax, vmalloc_size, tmp; 441 442 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 443 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 444 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 445 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 446 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42)) 447 vmax = 1UL << 42; /* 3-level kernel page table */ 448 else 449 vmax = 1UL << 53; /* 4-level kernel page table */ 450 /* module area is at the end of the kernel address space. */ 451 MODULES_END = vmax; 452 MODULES_VADDR = MODULES_END - MODULES_LEN; 453 VMALLOC_END = MODULES_VADDR; 454 VMALLOC_START = vmax - vmalloc_size; 455 456 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 457 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 458 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 459 tmp = SECTION_ALIGN_UP(tmp); 460 tmp = VMALLOC_START - tmp * sizeof(struct page); 461 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 462 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 463 vmemmap = (struct page *) tmp; 464 465 /* Take care that memory_end is set and <= vmemmap */ 466 memory_end = min(memory_end ?: max_physmem_end, tmp); 467 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 468 memblock_remove(memory_end, ULONG_MAX); 469 470 pr_notice("Max memory size: %luMB\n", memory_end >> 20); 471 } 472 473 static void __init setup_vmcoreinfo(void) 474 { 475 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 476 } 477 478 #ifdef CONFIG_CRASH_DUMP 479 480 /* 481 * When kdump is enabled, we have to ensure that no memory from 482 * the area [0 - crashkernel memory size] and 483 * [crashk_res.start - crashk_res.end] is set offline. 484 */ 485 static int kdump_mem_notifier(struct notifier_block *nb, 486 unsigned long action, void *data) 487 { 488 struct memory_notify *arg = data; 489 490 if (action != MEM_GOING_OFFLINE) 491 return NOTIFY_OK; 492 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 493 return NOTIFY_BAD; 494 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 495 return NOTIFY_OK; 496 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 497 return NOTIFY_OK; 498 return NOTIFY_BAD; 499 } 500 501 static struct notifier_block kdump_mem_nb = { 502 .notifier_call = kdump_mem_notifier, 503 }; 504 505 #endif 506 507 /* 508 * Make sure that the area behind memory_end is protected 509 */ 510 static void reserve_memory_end(void) 511 { 512 #ifdef CONFIG_CRASH_DUMP 513 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 514 !OLDMEM_BASE && sclp.hsa_size) { 515 memory_end = sclp.hsa_size; 516 memory_end &= PAGE_MASK; 517 memory_end_set = 1; 518 } 519 #endif 520 if (!memory_end_set) 521 return; 522 memblock_reserve(memory_end, ULONG_MAX); 523 } 524 525 /* 526 * Make sure that oldmem, where the dump is stored, is protected 527 */ 528 static void reserve_oldmem(void) 529 { 530 #ifdef CONFIG_CRASH_DUMP 531 if (OLDMEM_BASE) 532 /* Forget all memory above the running kdump system */ 533 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 534 #endif 535 } 536 537 /* 538 * Make sure that oldmem, where the dump is stored, is protected 539 */ 540 static void remove_oldmem(void) 541 { 542 #ifdef CONFIG_CRASH_DUMP 543 if (OLDMEM_BASE) 544 /* Forget all memory above the running kdump system */ 545 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 546 #endif 547 } 548 549 /* 550 * Reserve memory for kdump kernel to be loaded with kexec 551 */ 552 static void __init reserve_crashkernel(void) 553 { 554 #ifdef CONFIG_CRASH_DUMP 555 unsigned long long crash_base, crash_size; 556 phys_addr_t low, high; 557 int rc; 558 559 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 560 &crash_base); 561 562 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 563 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 564 if (rc || crash_size == 0) 565 return; 566 567 if (memblock.memory.regions[0].size < crash_size) { 568 pr_info("crashkernel reservation failed: %s\n", 569 "first memory chunk must be at least crashkernel size"); 570 return; 571 } 572 573 low = crash_base ?: OLDMEM_BASE; 574 high = low + crash_size; 575 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 576 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 577 crash_base = low; 578 } else { 579 /* Find suitable area in free memory */ 580 low = max_t(unsigned long, crash_size, sclp.hsa_size); 581 high = crash_base ? crash_base + crash_size : ULONG_MAX; 582 583 if (crash_base && crash_base < low) { 584 pr_info("crashkernel reservation failed: %s\n", 585 "crash_base too low"); 586 return; 587 } 588 low = crash_base ?: low; 589 crash_base = memblock_find_in_range(low, high, crash_size, 590 KEXEC_CRASH_MEM_ALIGN); 591 } 592 593 if (!crash_base) { 594 pr_info("crashkernel reservation failed: %s\n", 595 "no suitable area found"); 596 return; 597 } 598 599 if (register_memory_notifier(&kdump_mem_nb)) 600 return; 601 602 if (!OLDMEM_BASE && MACHINE_IS_VM) 603 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 604 crashk_res.start = crash_base; 605 crashk_res.end = crash_base + crash_size - 1; 606 insert_resource(&iomem_resource, &crashk_res); 607 memblock_remove(crash_base, crash_size); 608 pr_info("Reserving %lluMB of memory at %lluMB " 609 "for crashkernel (System RAM: %luMB)\n", 610 crash_size >> 20, crash_base >> 20, 611 (unsigned long)memblock.memory.total_size >> 20); 612 os_info_crashkernel_add(crash_base, crash_size); 613 #endif 614 } 615 616 /* 617 * Reserve the initrd from being used by memblock 618 */ 619 static void __init reserve_initrd(void) 620 { 621 #ifdef CONFIG_BLK_DEV_INITRD 622 initrd_start = INITRD_START; 623 initrd_end = initrd_start + INITRD_SIZE; 624 memblock_reserve(INITRD_START, INITRD_SIZE); 625 #endif 626 } 627 628 /* 629 * Check for initrd being in usable memory 630 */ 631 static void __init check_initrd(void) 632 { 633 #ifdef CONFIG_BLK_DEV_INITRD 634 if (INITRD_START && INITRD_SIZE && 635 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 636 pr_err("initrd does not fit memory.\n"); 637 memblock_free(INITRD_START, INITRD_SIZE); 638 initrd_start = initrd_end = 0; 639 } 640 #endif 641 } 642 643 /* 644 * Reserve memory used for lowcore/command line/kernel image. 645 */ 646 static void __init reserve_kernel(void) 647 { 648 unsigned long start_pfn = PFN_UP(__pa(&_end)); 649 650 #ifdef CONFIG_DMA_API_DEBUG 651 /* 652 * DMA_API_DEBUG code stumbles over addresses from the 653 * range [_ehead, _stext]. Mark the memory as reserved 654 * so it is not used for CONFIG_DMA_API_DEBUG=y. 655 */ 656 memblock_reserve(0, PFN_PHYS(start_pfn)); 657 #else 658 memblock_reserve(0, (unsigned long)_ehead); 659 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 660 - (unsigned long)_stext); 661 #endif 662 } 663 664 static void __init reserve_elfcorehdr(void) 665 { 666 #ifdef CONFIG_CRASH_DUMP 667 if (is_kdump_kernel()) 668 memblock_reserve(elfcorehdr_addr - OLDMEM_BASE, 669 PAGE_ALIGN(elfcorehdr_size)); 670 #endif 671 } 672 673 static void __init setup_memory(void) 674 { 675 struct memblock_region *reg; 676 677 /* 678 * Init storage key for present memory 679 */ 680 for_each_memblock(memory, reg) { 681 storage_key_init_range(reg->base, reg->base + reg->size); 682 } 683 psw_set_key(PAGE_DEFAULT_KEY); 684 685 /* Only cosmetics */ 686 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 687 } 688 689 /* 690 * Setup hardware capabilities. 691 */ 692 static int __init setup_hwcaps(void) 693 { 694 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 695 struct cpuid cpu_id; 696 int i; 697 698 /* 699 * The store facility list bits numbers as found in the principles 700 * of operation are numbered with bit 1UL<<31 as number 0 to 701 * bit 1UL<<0 as number 31. 702 * Bit 0: instructions named N3, "backported" to esa-mode 703 * Bit 2: z/Architecture mode is active 704 * Bit 7: the store-facility-list-extended facility is installed 705 * Bit 17: the message-security assist is installed 706 * Bit 19: the long-displacement facility is installed 707 * Bit 21: the extended-immediate facility is installed 708 * Bit 22: extended-translation facility 3 is installed 709 * Bit 30: extended-translation facility 3 enhancement facility 710 * These get translated to: 711 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 712 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 713 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 714 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 715 */ 716 for (i = 0; i < 6; i++) 717 if (test_facility(stfl_bits[i])) 718 elf_hwcap |= 1UL << i; 719 720 if (test_facility(22) && test_facility(30)) 721 elf_hwcap |= HWCAP_S390_ETF3EH; 722 723 /* 724 * Check for additional facilities with store-facility-list-extended. 725 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 726 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 727 * as stored by stfl, bits 32-xxx contain additional facilities. 728 * How many facility words are stored depends on the number of 729 * doublewords passed to the instruction. The additional facilities 730 * are: 731 * Bit 42: decimal floating point facility is installed 732 * Bit 44: perform floating point operation facility is installed 733 * translated to: 734 * HWCAP_S390_DFP bit 6 (42 && 44). 735 */ 736 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 737 elf_hwcap |= HWCAP_S390_DFP; 738 739 /* 740 * Huge page support HWCAP_S390_HPAGE is bit 7. 741 */ 742 if (MACHINE_HAS_HPAGE) 743 elf_hwcap |= HWCAP_S390_HPAGE; 744 745 /* 746 * 64-bit register support for 31-bit processes 747 * HWCAP_S390_HIGH_GPRS is bit 9. 748 */ 749 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 750 751 /* 752 * Transactional execution support HWCAP_S390_TE is bit 10. 753 */ 754 if (test_facility(50) && test_facility(73)) 755 elf_hwcap |= HWCAP_S390_TE; 756 757 /* 758 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 759 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 760 * instead of facility bit 129. 761 */ 762 if (MACHINE_HAS_VX) 763 elf_hwcap |= HWCAP_S390_VXRS; 764 get_cpu_id(&cpu_id); 765 add_device_randomness(&cpu_id, sizeof(cpu_id)); 766 switch (cpu_id.machine) { 767 case 0x2064: 768 case 0x2066: 769 default: /* Use "z900" as default for 64 bit kernels. */ 770 strcpy(elf_platform, "z900"); 771 break; 772 case 0x2084: 773 case 0x2086: 774 strcpy(elf_platform, "z990"); 775 break; 776 case 0x2094: 777 case 0x2096: 778 strcpy(elf_platform, "z9-109"); 779 break; 780 case 0x2097: 781 case 0x2098: 782 strcpy(elf_platform, "z10"); 783 break; 784 case 0x2817: 785 case 0x2818: 786 strcpy(elf_platform, "z196"); 787 break; 788 case 0x2827: 789 case 0x2828: 790 strcpy(elf_platform, "zEC12"); 791 break; 792 case 0x2964: 793 strcpy(elf_platform, "z13"); 794 break; 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 os_info_init(); 845 setup_ipl(); 846 847 /* Do some memory reservations *before* memory is added to memblock */ 848 reserve_memory_end(); 849 reserve_oldmem(); 850 reserve_kernel(); 851 reserve_initrd(); 852 reserve_elfcorehdr(); 853 memblock_allow_resize(); 854 855 /* Get information about *all* installed memory */ 856 detect_memory_memblock(); 857 858 remove_oldmem(); 859 860 /* 861 * Make sure all chunks are MAX_ORDER aligned so we don't need the 862 * extra checks that HOLES_IN_ZONE would require. 863 * 864 * Is this still required? 865 */ 866 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 867 868 setup_memory_end(); 869 setup_memory(); 870 871 check_initrd(); 872 reserve_crashkernel(); 873 /* 874 * Be aware that smp_save_dump_cpus() triggers a system reset. 875 * Therefore CPU and device initialization should be done afterwards. 876 */ 877 smp_save_dump_cpus(); 878 879 setup_resources(); 880 setup_vmcoreinfo(); 881 setup_lowcore(); 882 smp_fill_possible_mask(); 883 cpu_init(); 884 numa_setup(); 885 886 /* 887 * Create kernel page tables and switch to virtual addressing. 888 */ 889 paging_init(); 890 891 /* Setup default console */ 892 conmode_default(); 893 set_preferred_console(); 894 895 /* Setup zfcpdump support */ 896 setup_zfcpdump(); 897 898 /* Add system specific data to the random pool */ 899 setup_randomness(); 900 } 901