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/dma-contiguous.h> 39 #include <linux/device.h> 40 #include <linux/notifier.h> 41 #include <linux/pfn.h> 42 #include <linux/ctype.h> 43 #include <linux/reboot.h> 44 #include <linux/topology.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 <asm/numa.h> 67 #include "entry.h" 68 69 /* 70 * Machine setup.. 71 */ 72 unsigned int console_mode = 0; 73 EXPORT_SYMBOL(console_mode); 74 75 unsigned int console_devno = -1; 76 EXPORT_SYMBOL(console_devno); 77 78 unsigned int console_irq = -1; 79 EXPORT_SYMBOL(console_irq); 80 81 unsigned long elf_hwcap __read_mostly = 0; 82 char elf_platform[ELF_PLATFORM_SIZE]; 83 84 unsigned long int_hwcap = 0; 85 86 int __initdata memory_end_set; 87 unsigned long __initdata memory_end; 88 unsigned long __initdata max_physmem_end; 89 90 unsigned long VMALLOC_START; 91 EXPORT_SYMBOL(VMALLOC_START); 92 93 unsigned long VMALLOC_END; 94 EXPORT_SYMBOL(VMALLOC_END); 95 96 struct page *vmemmap; 97 EXPORT_SYMBOL(vmemmap); 98 99 unsigned long MODULES_VADDR; 100 unsigned long MODULES_END; 101 102 /* An array with a pointer to the lowcore of every CPU. */ 103 struct lowcore *lowcore_ptr[NR_CPUS]; 104 EXPORT_SYMBOL(lowcore_ptr); 105 106 /* 107 * This is set up by the setup-routine at boot-time 108 * for S390 need to find out, what we have to setup 109 * using address 0x10400 ... 110 */ 111 112 #include <asm/setup.h> 113 114 /* 115 * condev= and conmode= setup parameter. 116 */ 117 118 static int __init condev_setup(char *str) 119 { 120 int vdev; 121 122 vdev = simple_strtoul(str, &str, 0); 123 if (vdev >= 0 && vdev < 65536) { 124 console_devno = vdev; 125 console_irq = -1; 126 } 127 return 1; 128 } 129 130 __setup("condev=", condev_setup); 131 132 static void __init set_preferred_console(void) 133 { 134 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 135 add_preferred_console("ttyS", 0, NULL); 136 else if (CONSOLE_IS_3270) 137 add_preferred_console("tty3270", 0, NULL); 138 else if (CONSOLE_IS_VT220) 139 add_preferred_console("ttyS", 1, NULL); 140 else if (CONSOLE_IS_HVC) 141 add_preferred_console("hvc", 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 if (MACHINE_IS_KVM) { 208 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 209 SET_CONSOLE_VT220; 210 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 211 SET_CONSOLE_SCLP; 212 else 213 SET_CONSOLE_HVC; 214 } else { 215 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 216 SET_CONSOLE_SCLP; 217 #endif 218 } 219 } 220 221 #ifdef CONFIG_CRASH_DUMP 222 static void __init setup_zfcpdump(void) 223 { 224 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 225 return; 226 if (OLDMEM_BASE) 227 return; 228 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 229 console_loglevel = 2; 230 } 231 #else 232 static inline void setup_zfcpdump(void) {} 233 #endif /* CONFIG_CRASH_DUMP */ 234 235 /* 236 * Reboot, halt and power_off stubs. They just call _machine_restart, 237 * _machine_halt or _machine_power_off. 238 */ 239 240 void machine_restart(char *command) 241 { 242 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 243 /* 244 * Only unblank the console if we are called in enabled 245 * context or a bust_spinlocks cleared the way for us. 246 */ 247 console_unblank(); 248 _machine_restart(command); 249 } 250 251 void machine_halt(void) 252 { 253 if (!in_interrupt() || oops_in_progress) 254 /* 255 * Only unblank the console if we are called in enabled 256 * context or a bust_spinlocks cleared the way for us. 257 */ 258 console_unblank(); 259 _machine_halt(); 260 } 261 262 void machine_power_off(void) 263 { 264 if (!in_interrupt() || oops_in_progress) 265 /* 266 * Only unblank the console if we are called in enabled 267 * context or a bust_spinlocks cleared the way for us. 268 */ 269 console_unblank(); 270 _machine_power_off(); 271 } 272 273 /* 274 * Dummy power off function. 275 */ 276 void (*pm_power_off)(void) = machine_power_off; 277 EXPORT_SYMBOL_GPL(pm_power_off); 278 279 static int __init early_parse_mem(char *p) 280 { 281 memory_end = memparse(p, &p); 282 memory_end &= PAGE_MASK; 283 memory_end_set = 1; 284 return 0; 285 } 286 early_param("mem", early_parse_mem); 287 288 static int __init parse_vmalloc(char *arg) 289 { 290 if (!arg) 291 return -EINVAL; 292 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 293 return 0; 294 } 295 early_param("vmalloc", parse_vmalloc); 296 297 void *restart_stack __section(.data); 298 299 static void __init setup_lowcore(void) 300 { 301 struct lowcore *lc; 302 303 /* 304 * Setup lowcore for boot cpu 305 */ 306 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096); 307 lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc)); 308 lc->restart_psw.mask = PSW_KERNEL_BITS; 309 lc->restart_psw.addr = (unsigned long) restart_int_handler; 310 lc->external_new_psw.mask = PSW_KERNEL_BITS | 311 PSW_MASK_DAT | PSW_MASK_MCHECK; 312 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 313 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 314 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 315 lc->svc_new_psw.addr = (unsigned long) system_call; 316 lc->program_new_psw.mask = PSW_KERNEL_BITS | 317 PSW_MASK_DAT | PSW_MASK_MCHECK; 318 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 319 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 320 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 321 lc->io_new_psw.mask = PSW_KERNEL_BITS | 322 PSW_MASK_DAT | PSW_MASK_MCHECK; 323 lc->io_new_psw.addr = (unsigned long) io_int_handler; 324 lc->clock_comparator = -1ULL; 325 lc->kernel_stack = ((unsigned long) &init_thread_union) 326 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 327 lc->async_stack = (unsigned long) 328 memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE) 329 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 330 lc->panic_stack = (unsigned long) 331 memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE) 332 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 333 lc->current_task = (unsigned long)&init_task; 334 lc->lpp = LPP_MAGIC; 335 lc->machine_flags = S390_lowcore.machine_flags; 336 lc->preempt_count = S390_lowcore.preempt_count; 337 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 338 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 339 MAX_FACILITY_BIT/8); 340 if (MACHINE_HAS_VX) 341 lc->vector_save_area_addr = 342 (unsigned long) &lc->vector_save_area; 343 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 344 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 345 lc->async_enter_timer = S390_lowcore.async_enter_timer; 346 lc->exit_timer = S390_lowcore.exit_timer; 347 lc->user_timer = S390_lowcore.user_timer; 348 lc->system_timer = S390_lowcore.system_timer; 349 lc->steal_timer = S390_lowcore.steal_timer; 350 lc->last_update_timer = S390_lowcore.last_update_timer; 351 lc->last_update_clock = S390_lowcore.last_update_clock; 352 353 restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE); 354 restart_stack += ASYNC_SIZE; 355 356 /* 357 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 358 * restart data to the absolute zero lowcore. This is necessary if 359 * PSW restart is done on an offline CPU that has lowcore zero. 360 */ 361 lc->restart_stack = (unsigned long) restart_stack; 362 lc->restart_fn = (unsigned long) do_restart; 363 lc->restart_data = 0; 364 lc->restart_source = -1UL; 365 366 /* Setup absolute zero lowcore */ 367 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 368 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 369 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 370 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 371 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 372 373 #ifdef CONFIG_SMP 374 lc->spinlock_lockval = arch_spin_lockval(0); 375 #endif 376 377 set_prefix((u32)(unsigned long) lc); 378 lowcore_ptr[0] = lc; 379 } 380 381 static struct resource code_resource = { 382 .name = "Kernel code", 383 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 384 }; 385 386 static struct resource data_resource = { 387 .name = "Kernel data", 388 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 389 }; 390 391 static struct resource bss_resource = { 392 .name = "Kernel bss", 393 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 394 }; 395 396 static struct resource __initdata *standard_resources[] = { 397 &code_resource, 398 &data_resource, 399 &bss_resource, 400 }; 401 402 static void __init setup_resources(void) 403 { 404 struct resource *res, *std_res, *sub_res; 405 struct memblock_region *reg; 406 int j; 407 408 code_resource.start = (unsigned long) &_text; 409 code_resource.end = (unsigned long) &_etext - 1; 410 data_resource.start = (unsigned long) &_etext; 411 data_resource.end = (unsigned long) &_edata - 1; 412 bss_resource.start = (unsigned long) &__bss_start; 413 bss_resource.end = (unsigned long) &__bss_stop - 1; 414 415 for_each_memblock(memory, reg) { 416 res = memblock_virt_alloc(sizeof(*res), 8); 417 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 418 419 res->name = "System RAM"; 420 res->start = reg->base; 421 res->end = reg->base + reg->size - 1; 422 request_resource(&iomem_resource, res); 423 424 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 425 std_res = standard_resources[j]; 426 if (std_res->start < res->start || 427 std_res->start > res->end) 428 continue; 429 if (std_res->end > res->end) { 430 sub_res = memblock_virt_alloc(sizeof(*sub_res), 8); 431 *sub_res = *std_res; 432 sub_res->end = res->end; 433 std_res->start = res->end + 1; 434 request_resource(res, sub_res); 435 } else { 436 request_resource(res, std_res); 437 } 438 } 439 } 440 #ifdef CONFIG_CRASH_DUMP 441 /* 442 * Re-add removed crash kernel memory as reserved memory. This makes 443 * sure it will be mapped with the identity mapping and struct pages 444 * will be created, so it can be resized later on. 445 * However add it later since the crash kernel resource should not be 446 * part of the System RAM resource. 447 */ 448 if (crashk_res.end) { 449 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); 450 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 451 insert_resource(&iomem_resource, &crashk_res); 452 } 453 #endif 454 } 455 456 static void __init setup_memory_end(void) 457 { 458 unsigned long vmax, vmalloc_size, tmp; 459 460 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 461 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 462 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 463 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 464 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42)) 465 vmax = 1UL << 42; /* 3-level kernel page table */ 466 else 467 vmax = 1UL << 53; /* 4-level kernel page table */ 468 /* module area is at the end of the kernel address space. */ 469 MODULES_END = vmax; 470 MODULES_VADDR = MODULES_END - MODULES_LEN; 471 VMALLOC_END = MODULES_VADDR; 472 VMALLOC_START = vmax - vmalloc_size; 473 474 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 475 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 476 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 477 tmp = SECTION_ALIGN_UP(tmp); 478 tmp = VMALLOC_START - tmp * sizeof(struct page); 479 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 480 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 481 vmemmap = (struct page *) tmp; 482 483 /* Take care that memory_end is set and <= vmemmap */ 484 memory_end = min(memory_end ?: max_physmem_end, tmp); 485 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 486 memblock_remove(memory_end, ULONG_MAX); 487 488 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20); 489 } 490 491 static void __init setup_vmcoreinfo(void) 492 { 493 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 494 } 495 496 #ifdef CONFIG_CRASH_DUMP 497 498 /* 499 * When kdump is enabled, we have to ensure that no memory from 500 * the area [0 - crashkernel memory size] and 501 * [crashk_res.start - crashk_res.end] is set offline. 502 */ 503 static int kdump_mem_notifier(struct notifier_block *nb, 504 unsigned long action, void *data) 505 { 506 struct memory_notify *arg = data; 507 508 if (action != MEM_GOING_OFFLINE) 509 return NOTIFY_OK; 510 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 511 return NOTIFY_BAD; 512 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 513 return NOTIFY_OK; 514 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 515 return NOTIFY_OK; 516 return NOTIFY_BAD; 517 } 518 519 static struct notifier_block kdump_mem_nb = { 520 .notifier_call = kdump_mem_notifier, 521 }; 522 523 #endif 524 525 /* 526 * Make sure that the area behind memory_end is protected 527 */ 528 static void reserve_memory_end(void) 529 { 530 #ifdef CONFIG_CRASH_DUMP 531 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 532 !OLDMEM_BASE && sclp.hsa_size) { 533 memory_end = sclp.hsa_size; 534 memory_end &= PAGE_MASK; 535 memory_end_set = 1; 536 } 537 #endif 538 if (!memory_end_set) 539 return; 540 memblock_reserve(memory_end, ULONG_MAX); 541 } 542 543 /* 544 * Make sure that oldmem, where the dump is stored, is protected 545 */ 546 static void reserve_oldmem(void) 547 { 548 #ifdef CONFIG_CRASH_DUMP 549 if (OLDMEM_BASE) 550 /* Forget all memory above the running kdump system */ 551 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 552 #endif 553 } 554 555 /* 556 * Make sure that oldmem, where the dump is stored, is protected 557 */ 558 static void remove_oldmem(void) 559 { 560 #ifdef CONFIG_CRASH_DUMP 561 if (OLDMEM_BASE) 562 /* Forget all memory above the running kdump system */ 563 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 564 #endif 565 } 566 567 /* 568 * Reserve memory for kdump kernel to be loaded with kexec 569 */ 570 static void __init reserve_crashkernel(void) 571 { 572 #ifdef CONFIG_CRASH_DUMP 573 unsigned long long crash_base, crash_size; 574 phys_addr_t low, high; 575 int rc; 576 577 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 578 &crash_base); 579 580 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 581 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 582 if (rc || crash_size == 0) 583 return; 584 585 if (memblock.memory.regions[0].size < crash_size) { 586 pr_info("crashkernel reservation failed: %s\n", 587 "first memory chunk must be at least crashkernel size"); 588 return; 589 } 590 591 low = crash_base ?: OLDMEM_BASE; 592 high = low + crash_size; 593 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 594 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 595 crash_base = low; 596 } else { 597 /* Find suitable area in free memory */ 598 low = max_t(unsigned long, crash_size, sclp.hsa_size); 599 high = crash_base ? crash_base + crash_size : ULONG_MAX; 600 601 if (crash_base && crash_base < low) { 602 pr_info("crashkernel reservation failed: %s\n", 603 "crash_base too low"); 604 return; 605 } 606 low = crash_base ?: low; 607 crash_base = memblock_find_in_range(low, high, crash_size, 608 KEXEC_CRASH_MEM_ALIGN); 609 } 610 611 if (!crash_base) { 612 pr_info("crashkernel reservation failed: %s\n", 613 "no suitable area found"); 614 return; 615 } 616 617 if (register_memory_notifier(&kdump_mem_nb)) 618 return; 619 620 if (!OLDMEM_BASE && MACHINE_IS_VM) 621 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 622 crashk_res.start = crash_base; 623 crashk_res.end = crash_base + crash_size - 1; 624 memblock_remove(crash_base, crash_size); 625 pr_info("Reserving %lluMB of memory at %lluMB " 626 "for crashkernel (System RAM: %luMB)\n", 627 crash_size >> 20, crash_base >> 20, 628 (unsigned long)memblock.memory.total_size >> 20); 629 os_info_crashkernel_add(crash_base, crash_size); 630 #endif 631 } 632 633 /* 634 * Reserve the initrd from being used by memblock 635 */ 636 static void __init reserve_initrd(void) 637 { 638 #ifdef CONFIG_BLK_DEV_INITRD 639 if (!INITRD_START || !INITRD_SIZE) 640 return; 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 */ 650 static 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("The initial RAM disk does not fit into the memory\n"); 656 memblock_free(INITRD_START, INITRD_SIZE); 657 initrd_start = initrd_end = 0; 658 } 659 #endif 660 } 661 662 /* 663 * Reserve memory used for lowcore/command line/kernel image. 664 */ 665 static void __init reserve_kernel(void) 666 { 667 unsigned long start_pfn = PFN_UP(__pa(&_end)); 668 669 #ifdef CONFIG_DMA_API_DEBUG 670 /* 671 * DMA_API_DEBUG code stumbles over addresses from the 672 * range [_ehead, _stext]. Mark the memory as reserved 673 * so it is not used for CONFIG_DMA_API_DEBUG=y. 674 */ 675 memblock_reserve(0, PFN_PHYS(start_pfn)); 676 #else 677 memblock_reserve(0, (unsigned long)_ehead); 678 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 679 - (unsigned long)_stext); 680 #endif 681 } 682 683 static void __init setup_memory(void) 684 { 685 struct memblock_region *reg; 686 687 /* 688 * Init storage key for present memory 689 */ 690 for_each_memblock(memory, reg) { 691 storage_key_init_range(reg->base, reg->base + reg->size); 692 } 693 psw_set_key(PAGE_DEFAULT_KEY); 694 695 /* Only cosmetics */ 696 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 697 } 698 699 /* 700 * Setup hardware capabilities. 701 */ 702 static int __init setup_hwcaps(void) 703 { 704 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 705 struct cpuid cpu_id; 706 int i; 707 708 /* 709 * The store facility list bits numbers as found in the principles 710 * of operation are numbered with bit 1UL<<31 as number 0 to 711 * bit 1UL<<0 as number 31. 712 * Bit 0: instructions named N3, "backported" to esa-mode 713 * Bit 2: z/Architecture mode is active 714 * Bit 7: the store-facility-list-extended facility is installed 715 * Bit 17: the message-security assist is installed 716 * Bit 19: the long-displacement facility is installed 717 * Bit 21: the extended-immediate facility is installed 718 * Bit 22: extended-translation facility 3 is installed 719 * Bit 30: extended-translation facility 3 enhancement facility 720 * These get translated to: 721 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 722 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 723 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 724 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 725 */ 726 for (i = 0; i < 6; i++) 727 if (test_facility(stfl_bits[i])) 728 elf_hwcap |= 1UL << i; 729 730 if (test_facility(22) && test_facility(30)) 731 elf_hwcap |= HWCAP_S390_ETF3EH; 732 733 /* 734 * Check for additional facilities with store-facility-list-extended. 735 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 736 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 737 * as stored by stfl, bits 32-xxx contain additional facilities. 738 * How many facility words are stored depends on the number of 739 * doublewords passed to the instruction. The additional facilities 740 * are: 741 * Bit 42: decimal floating point facility is installed 742 * Bit 44: perform floating point operation facility is installed 743 * translated to: 744 * HWCAP_S390_DFP bit 6 (42 && 44). 745 */ 746 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 747 elf_hwcap |= HWCAP_S390_DFP; 748 749 /* 750 * Huge page support HWCAP_S390_HPAGE is bit 7. 751 */ 752 if (MACHINE_HAS_EDAT1) 753 elf_hwcap |= HWCAP_S390_HPAGE; 754 755 /* 756 * 64-bit register support for 31-bit processes 757 * HWCAP_S390_HIGH_GPRS is bit 9. 758 */ 759 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 760 761 /* 762 * Transactional execution support HWCAP_S390_TE is bit 10. 763 */ 764 if (test_facility(50) && test_facility(73)) 765 elf_hwcap |= HWCAP_S390_TE; 766 767 /* 768 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 769 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 770 * instead of facility bit 129. 771 */ 772 if (MACHINE_HAS_VX) { 773 elf_hwcap |= HWCAP_S390_VXRS; 774 if (test_facility(134)) 775 elf_hwcap |= HWCAP_S390_VXRS_EXT; 776 if (test_facility(135)) 777 elf_hwcap |= HWCAP_S390_VXRS_BCD; 778 } 779 780 get_cpu_id(&cpu_id); 781 add_device_randomness(&cpu_id, sizeof(cpu_id)); 782 switch (cpu_id.machine) { 783 case 0x2064: 784 case 0x2066: 785 default: /* Use "z900" as default for 64 bit kernels. */ 786 strcpy(elf_platform, "z900"); 787 break; 788 case 0x2084: 789 case 0x2086: 790 strcpy(elf_platform, "z990"); 791 break; 792 case 0x2094: 793 case 0x2096: 794 strcpy(elf_platform, "z9-109"); 795 break; 796 case 0x2097: 797 case 0x2098: 798 strcpy(elf_platform, "z10"); 799 break; 800 case 0x2817: 801 case 0x2818: 802 strcpy(elf_platform, "z196"); 803 break; 804 case 0x2827: 805 case 0x2828: 806 strcpy(elf_platform, "zEC12"); 807 break; 808 case 0x2964: 809 case 0x2965: 810 strcpy(elf_platform, "z13"); 811 break; 812 } 813 814 /* 815 * Virtualization support HWCAP_INT_SIE is bit 0. 816 */ 817 if (sclp.has_sief2) 818 int_hwcap |= HWCAP_INT_SIE; 819 820 return 0; 821 } 822 arch_initcall(setup_hwcaps); 823 824 /* 825 * Add system information as device randomness 826 */ 827 static void __init setup_randomness(void) 828 { 829 struct sysinfo_3_2_2 *vmms; 830 831 vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE); 832 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 833 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 834 memblock_free((unsigned long) vmms, PAGE_SIZE); 835 } 836 837 /* 838 * Find the correct size for the task_struct. This depends on 839 * the size of the struct fpu at the end of the thread_struct 840 * which is embedded in the task_struct. 841 */ 842 static void __init setup_task_size(void) 843 { 844 int task_size = sizeof(struct task_struct); 845 846 if (!MACHINE_HAS_VX) { 847 task_size -= sizeof(__vector128) * __NUM_VXRS; 848 task_size += sizeof(freg_t) * __NUM_FPRS; 849 } 850 arch_task_struct_size = task_size; 851 } 852 853 /* 854 * Setup function called from init/main.c just after the banner 855 * was printed. 856 */ 857 858 void __init setup_arch(char **cmdline_p) 859 { 860 /* 861 * print what head.S has found out about the machine 862 */ 863 if (MACHINE_IS_VM) 864 pr_info("Linux is running as a z/VM " 865 "guest operating system in 64-bit mode\n"); 866 else if (MACHINE_IS_KVM) 867 pr_info("Linux is running under KVM in 64-bit mode\n"); 868 else if (MACHINE_IS_LPAR) 869 pr_info("Linux is running natively in 64-bit mode\n"); 870 871 /* Have one command line that is parsed and saved in /proc/cmdline */ 872 /* boot_command_line has been already set up in early.c */ 873 *cmdline_p = boot_command_line; 874 875 ROOT_DEV = Root_RAM0; 876 877 /* Is init_mm really needed? */ 878 init_mm.start_code = PAGE_OFFSET; 879 init_mm.end_code = (unsigned long) &_etext; 880 init_mm.end_data = (unsigned long) &_edata; 881 init_mm.brk = (unsigned long) &_end; 882 883 parse_early_param(); 884 #ifdef CONFIG_CRASH_DUMP 885 /* Deactivate elfcorehdr= kernel parameter */ 886 elfcorehdr_addr = ELFCORE_ADDR_MAX; 887 #endif 888 889 os_info_init(); 890 setup_ipl(); 891 setup_task_size(); 892 893 /* Do some memory reservations *before* memory is added to memblock */ 894 reserve_memory_end(); 895 reserve_oldmem(); 896 reserve_kernel(); 897 reserve_initrd(); 898 memblock_allow_resize(); 899 900 /* Get information about *all* installed memory */ 901 detect_memory_memblock(); 902 903 remove_oldmem(); 904 905 /* 906 * Make sure all chunks are MAX_ORDER aligned so we don't need the 907 * extra checks that HOLES_IN_ZONE would require. 908 * 909 * Is this still required? 910 */ 911 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 912 913 setup_memory_end(); 914 setup_memory(); 915 dma_contiguous_reserve(memory_end); 916 917 check_initrd(); 918 reserve_crashkernel(); 919 #ifdef CONFIG_CRASH_DUMP 920 /* 921 * Be aware that smp_save_dump_cpus() triggers a system reset. 922 * Therefore CPU and device initialization should be done afterwards. 923 */ 924 smp_save_dump_cpus(); 925 #endif 926 927 setup_resources(); 928 setup_vmcoreinfo(); 929 setup_lowcore(); 930 smp_fill_possible_mask(); 931 cpu_detect_mhz_feature(); 932 cpu_init(); 933 numa_setup(); 934 smp_detect_cpus(); 935 topology_init_early(); 936 937 /* 938 * Create kernel page tables and switch to virtual addressing. 939 */ 940 paging_init(); 941 942 /* Setup default console */ 943 conmode_default(); 944 set_preferred_console(); 945 946 /* Setup zfcpdump support */ 947 setup_zfcpdump(); 948 949 /* Add system specific data to the random pool */ 950 setup_randomness(); 951 } 952