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 "entry.h" 66 67 /* 68 * Machine setup.. 69 */ 70 unsigned int console_mode = 0; 71 EXPORT_SYMBOL(console_mode); 72 73 unsigned int console_devno = -1; 74 EXPORT_SYMBOL(console_devno); 75 76 unsigned int console_irq = -1; 77 EXPORT_SYMBOL(console_irq); 78 79 unsigned long elf_hwcap = 0; 80 char elf_platform[ELF_PLATFORM_SIZE]; 81 82 int __initdata memory_end_set; 83 unsigned long __initdata memory_end; 84 unsigned long __initdata max_physmem_end; 85 86 unsigned long VMALLOC_START; 87 EXPORT_SYMBOL(VMALLOC_START); 88 89 unsigned long VMALLOC_END; 90 EXPORT_SYMBOL(VMALLOC_END); 91 92 struct page *vmemmap; 93 EXPORT_SYMBOL(vmemmap); 94 95 unsigned long MODULES_VADDR; 96 unsigned long MODULES_END; 97 98 /* An array with a pointer to the lowcore of every CPU. */ 99 struct _lowcore *lowcore_ptr[NR_CPUS]; 100 EXPORT_SYMBOL(lowcore_ptr); 101 102 /* 103 * This is set up by the setup-routine at boot-time 104 * for S390 need to find out, what we have to setup 105 * using address 0x10400 ... 106 */ 107 108 #include <asm/setup.h> 109 110 /* 111 * condev= and conmode= setup parameter. 112 */ 113 114 static int __init condev_setup(char *str) 115 { 116 int vdev; 117 118 vdev = simple_strtoul(str, &str, 0); 119 if (vdev >= 0 && vdev < 65536) { 120 console_devno = vdev; 121 console_irq = -1; 122 } 123 return 1; 124 } 125 126 __setup("condev=", condev_setup); 127 128 static void __init set_preferred_console(void) 129 { 130 if (MACHINE_IS_KVM) { 131 if (sclp.has_vt220) 132 add_preferred_console("ttyS", 1, NULL); 133 else if (sclp.has_linemode) 134 add_preferred_console("ttyS", 0, NULL); 135 else 136 add_preferred_console("hvc", 0, NULL); 137 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 138 add_preferred_console("ttyS", 0, NULL); 139 else if (CONSOLE_IS_3270) 140 add_preferred_console("tty3270", 0, NULL); 141 } 142 143 static int __init conmode_setup(char *str) 144 { 145 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 146 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 147 SET_CONSOLE_SCLP; 148 #endif 149 #if defined(CONFIG_TN3215_CONSOLE) 150 if (strncmp(str, "3215", 5) == 0) 151 SET_CONSOLE_3215; 152 #endif 153 #if defined(CONFIG_TN3270_CONSOLE) 154 if (strncmp(str, "3270", 5) == 0) 155 SET_CONSOLE_3270; 156 #endif 157 set_preferred_console(); 158 return 1; 159 } 160 161 __setup("conmode=", conmode_setup); 162 163 static void __init conmode_default(void) 164 { 165 char query_buffer[1024]; 166 char *ptr; 167 168 if (MACHINE_IS_VM) { 169 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 170 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 171 ptr = strstr(query_buffer, "SUBCHANNEL ="); 172 console_irq = simple_strtoul(ptr + 13, NULL, 16); 173 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 174 ptr = strstr(query_buffer, "CONMODE"); 175 /* 176 * Set the conmode to 3215 so that the device recognition 177 * will set the cu_type of the console to 3215. If the 178 * conmode is 3270 and we don't set it back then both 179 * 3215 and the 3270 driver will try to access the console 180 * device (3215 as console and 3270 as normal tty). 181 */ 182 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 183 if (ptr == NULL) { 184 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 185 SET_CONSOLE_SCLP; 186 #endif 187 return; 188 } 189 if (strncmp(ptr + 8, "3270", 4) == 0) { 190 #if defined(CONFIG_TN3270_CONSOLE) 191 SET_CONSOLE_3270; 192 #elif defined(CONFIG_TN3215_CONSOLE) 193 SET_CONSOLE_3215; 194 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 195 SET_CONSOLE_SCLP; 196 #endif 197 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 198 #if defined(CONFIG_TN3215_CONSOLE) 199 SET_CONSOLE_3215; 200 #elif defined(CONFIG_TN3270_CONSOLE) 201 SET_CONSOLE_3270; 202 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 203 SET_CONSOLE_SCLP; 204 #endif 205 } 206 } else { 207 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 208 SET_CONSOLE_SCLP; 209 #endif 210 } 211 } 212 213 #ifdef CONFIG_CRASH_DUMP 214 static void __init setup_zfcpdump(void) 215 { 216 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 217 return; 218 if (OLDMEM_BASE) 219 return; 220 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 221 console_loglevel = 2; 222 } 223 #else 224 static inline void setup_zfcpdump(void) {} 225 #endif /* CONFIG_CRASH_DUMP */ 226 227 /* 228 * Reboot, halt and power_off stubs. They just call _machine_restart, 229 * _machine_halt or _machine_power_off. 230 */ 231 232 void machine_restart(char *command) 233 { 234 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 235 /* 236 * Only unblank the console if we are called in enabled 237 * context or a bust_spinlocks cleared the way for us. 238 */ 239 console_unblank(); 240 _machine_restart(command); 241 } 242 243 void machine_halt(void) 244 { 245 if (!in_interrupt() || oops_in_progress) 246 /* 247 * Only unblank the console if we are called in enabled 248 * context or a bust_spinlocks cleared the way for us. 249 */ 250 console_unblank(); 251 _machine_halt(); 252 } 253 254 void machine_power_off(void) 255 { 256 if (!in_interrupt() || oops_in_progress) 257 /* 258 * Only unblank the console if we are called in enabled 259 * context or a bust_spinlocks cleared the way for us. 260 */ 261 console_unblank(); 262 _machine_power_off(); 263 } 264 265 /* 266 * Dummy power off function. 267 */ 268 void (*pm_power_off)(void) = machine_power_off; 269 EXPORT_SYMBOL_GPL(pm_power_off); 270 271 static int __init early_parse_mem(char *p) 272 { 273 memory_end = memparse(p, &p); 274 memory_end &= PAGE_MASK; 275 memory_end_set = 1; 276 return 0; 277 } 278 early_param("mem", early_parse_mem); 279 280 static int __init parse_vmalloc(char *arg) 281 { 282 if (!arg) 283 return -EINVAL; 284 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 285 return 0; 286 } 287 early_param("vmalloc", parse_vmalloc); 288 289 void *restart_stack __attribute__((__section__(".data"))); 290 291 static void __init setup_lowcore(void) 292 { 293 struct _lowcore *lc; 294 295 /* 296 * Setup lowcore for boot cpu 297 */ 298 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); 299 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 300 lc->restart_psw.mask = PSW_KERNEL_BITS; 301 lc->restart_psw.addr = 302 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 303 lc->external_new_psw.mask = PSW_KERNEL_BITS | 304 PSW_MASK_DAT | PSW_MASK_MCHECK; 305 lc->external_new_psw.addr = 306 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 307 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 308 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 309 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 310 lc->program_new_psw.mask = PSW_KERNEL_BITS | 311 PSW_MASK_DAT | PSW_MASK_MCHECK; 312 lc->program_new_psw.addr = 313 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler; 314 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 315 lc->mcck_new_psw.addr = 316 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 317 lc->io_new_psw.mask = PSW_KERNEL_BITS | 318 PSW_MASK_DAT | PSW_MASK_MCHECK; 319 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 320 lc->clock_comparator = -1ULL; 321 lc->kernel_stack = ((unsigned long) &init_thread_union) 322 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 323 lc->async_stack = (unsigned long) 324 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) 325 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 326 lc->panic_stack = (unsigned long) 327 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) 328 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 329 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 330 lc->thread_info = (unsigned long) &init_thread_union; 331 lc->machine_flags = S390_lowcore.machine_flags; 332 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 333 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 334 MAX_FACILITY_BIT/8); 335 if (MACHINE_HAS_VX) 336 lc->vector_save_area_addr = 337 (unsigned long) &lc->vector_save_area; 338 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 339 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 340 lc->async_enter_timer = S390_lowcore.async_enter_timer; 341 lc->exit_timer = S390_lowcore.exit_timer; 342 lc->user_timer = S390_lowcore.user_timer; 343 lc->system_timer = S390_lowcore.system_timer; 344 lc->steal_timer = S390_lowcore.steal_timer; 345 lc->last_update_timer = S390_lowcore.last_update_timer; 346 lc->last_update_clock = S390_lowcore.last_update_clock; 347 348 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 349 restart_stack += ASYNC_SIZE; 350 351 /* 352 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 353 * restart data to the absolute zero lowcore. This is necessary if 354 * PSW restart is done on an offline CPU that has lowcore zero. 355 */ 356 lc->restart_stack = (unsigned long) restart_stack; 357 lc->restart_fn = (unsigned long) do_restart; 358 lc->restart_data = 0; 359 lc->restart_source = -1UL; 360 361 /* Setup absolute zero lowcore */ 362 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 363 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 364 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 365 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 366 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 367 368 #ifdef CONFIG_SMP 369 lc->spinlock_lockval = arch_spin_lockval(0); 370 #endif 371 372 set_prefix((u32)(unsigned long) lc); 373 lowcore_ptr[0] = lc; 374 } 375 376 static struct resource code_resource = { 377 .name = "Kernel code", 378 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 379 }; 380 381 static struct resource data_resource = { 382 .name = "Kernel data", 383 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 384 }; 385 386 static struct resource bss_resource = { 387 .name = "Kernel bss", 388 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 389 }; 390 391 static struct resource __initdata *standard_resources[] = { 392 &code_resource, 393 &data_resource, 394 &bss_resource, 395 }; 396 397 static void __init setup_resources(void) 398 { 399 struct resource *res, *std_res, *sub_res; 400 struct memblock_region *reg; 401 int j; 402 403 code_resource.start = (unsigned long) &_text; 404 code_resource.end = (unsigned long) &_etext - 1; 405 data_resource.start = (unsigned long) &_etext; 406 data_resource.end = (unsigned long) &_edata - 1; 407 bss_resource.start = (unsigned long) &__bss_start; 408 bss_resource.end = (unsigned long) &__bss_stop - 1; 409 410 for_each_memblock(memory, reg) { 411 res = alloc_bootmem_low(sizeof(*res)); 412 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 413 414 res->name = "System RAM"; 415 res->start = reg->base; 416 res->end = reg->base + reg->size - 1; 417 request_resource(&iomem_resource, res); 418 419 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 420 std_res = standard_resources[j]; 421 if (std_res->start < res->start || 422 std_res->start > res->end) 423 continue; 424 if (std_res->end > res->end) { 425 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 426 *sub_res = *std_res; 427 sub_res->end = res->end; 428 std_res->start = res->end + 1; 429 request_resource(res, sub_res); 430 } else { 431 request_resource(res, std_res); 432 } 433 } 434 } 435 } 436 437 static void __init setup_memory_end(void) 438 { 439 unsigned long vmax, vmalloc_size, tmp; 440 441 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 442 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 443 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; 444 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 445 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42)) 446 vmax = 1UL << 42; /* 3-level kernel page table */ 447 else 448 vmax = 1UL << 53; /* 4-level kernel page table */ 449 /* module area is at the end of the kernel address space. */ 450 MODULES_END = vmax; 451 MODULES_VADDR = MODULES_END - MODULES_LEN; 452 VMALLOC_END = MODULES_VADDR; 453 VMALLOC_START = vmax - vmalloc_size; 454 455 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 456 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 457 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 458 tmp = SECTION_ALIGN_UP(tmp); 459 tmp = VMALLOC_START - tmp * sizeof(struct page); 460 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 461 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 462 vmemmap = (struct page *) tmp; 463 464 /* Take care that memory_end is set and <= vmemmap */ 465 memory_end = min(memory_end ?: max_physmem_end, tmp); 466 max_pfn = max_low_pfn = PFN_DOWN(memory_end); 467 memblock_remove(memory_end, ULONG_MAX); 468 469 pr_notice("Max memory size: %luMB\n", memory_end >> 20); 470 } 471 472 static void __init setup_vmcoreinfo(void) 473 { 474 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 475 } 476 477 #ifdef CONFIG_CRASH_DUMP 478 479 /* 480 * When kdump is enabled, we have to ensure that no memory from 481 * the area [0 - crashkernel memory size] and 482 * [crashk_res.start - crashk_res.end] is set offline. 483 */ 484 static int kdump_mem_notifier(struct notifier_block *nb, 485 unsigned long action, void *data) 486 { 487 struct memory_notify *arg = data; 488 489 if (action != MEM_GOING_OFFLINE) 490 return NOTIFY_OK; 491 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 492 return NOTIFY_BAD; 493 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 494 return NOTIFY_OK; 495 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 496 return NOTIFY_OK; 497 return NOTIFY_BAD; 498 } 499 500 static struct notifier_block kdump_mem_nb = { 501 .notifier_call = kdump_mem_notifier, 502 }; 503 504 #endif 505 506 /* 507 * Make sure that the area behind memory_end is protected 508 */ 509 static void reserve_memory_end(void) 510 { 511 #ifdef CONFIG_CRASH_DUMP 512 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 513 !OLDMEM_BASE && sclp.hsa_size) { 514 memory_end = sclp.hsa_size; 515 memory_end &= PAGE_MASK; 516 memory_end_set = 1; 517 } 518 #endif 519 if (!memory_end_set) 520 return; 521 memblock_reserve(memory_end, ULONG_MAX); 522 } 523 524 /* 525 * Make sure that oldmem, where the dump is stored, is protected 526 */ 527 static void reserve_oldmem(void) 528 { 529 #ifdef CONFIG_CRASH_DUMP 530 if (OLDMEM_BASE) 531 /* Forget all memory above the running kdump system */ 532 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 533 #endif 534 } 535 536 /* 537 * Make sure that oldmem, where the dump is stored, is protected 538 */ 539 static void remove_oldmem(void) 540 { 541 #ifdef CONFIG_CRASH_DUMP 542 if (OLDMEM_BASE) 543 /* Forget all memory above the running kdump system */ 544 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 545 #endif 546 } 547 548 /* 549 * Reserve memory for kdump kernel to be loaded with kexec 550 */ 551 static void __init reserve_crashkernel(void) 552 { 553 #ifdef CONFIG_CRASH_DUMP 554 unsigned long long crash_base, crash_size; 555 phys_addr_t low, high; 556 int rc; 557 558 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 559 &crash_base); 560 561 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 562 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 563 if (rc || crash_size == 0) 564 return; 565 566 if (memblock.memory.regions[0].size < crash_size) { 567 pr_info("crashkernel reservation failed: %s\n", 568 "first memory chunk must be at least crashkernel size"); 569 return; 570 } 571 572 low = crash_base ?: OLDMEM_BASE; 573 high = low + crash_size; 574 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 575 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 576 crash_base = low; 577 } else { 578 /* Find suitable area in free memory */ 579 low = max_t(unsigned long, crash_size, sclp.hsa_size); 580 high = crash_base ? crash_base + crash_size : ULONG_MAX; 581 582 if (crash_base && crash_base < low) { 583 pr_info("crashkernel reservation failed: %s\n", 584 "crash_base too low"); 585 return; 586 } 587 low = crash_base ?: low; 588 crash_base = memblock_find_in_range(low, high, crash_size, 589 KEXEC_CRASH_MEM_ALIGN); 590 } 591 592 if (!crash_base) { 593 pr_info("crashkernel reservation failed: %s\n", 594 "no suitable area found"); 595 return; 596 } 597 598 if (register_memory_notifier(&kdump_mem_nb)) 599 return; 600 601 if (!OLDMEM_BASE && MACHINE_IS_VM) 602 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 603 crashk_res.start = crash_base; 604 crashk_res.end = crash_base + crash_size - 1; 605 insert_resource(&iomem_resource, &crashk_res); 606 memblock_remove(crash_base, crash_size); 607 pr_info("Reserving %lluMB of memory at %lluMB " 608 "for crashkernel (System RAM: %luMB)\n", 609 crash_size >> 20, crash_base >> 20, 610 (unsigned long)memblock.memory.total_size >> 20); 611 os_info_crashkernel_add(crash_base, crash_size); 612 #endif 613 } 614 615 /* 616 * Reserve the initrd from being used by memblock 617 */ 618 static void __init reserve_initrd(void) 619 { 620 #ifdef CONFIG_BLK_DEV_INITRD 621 initrd_start = INITRD_START; 622 initrd_end = initrd_start + INITRD_SIZE; 623 memblock_reserve(INITRD_START, INITRD_SIZE); 624 #endif 625 } 626 627 /* 628 * Check for initrd being in usable memory 629 */ 630 static void __init check_initrd(void) 631 { 632 #ifdef CONFIG_BLK_DEV_INITRD 633 if (INITRD_START && INITRD_SIZE && 634 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 635 pr_err("initrd does not fit memory.\n"); 636 memblock_free(INITRD_START, INITRD_SIZE); 637 initrd_start = initrd_end = 0; 638 } 639 #endif 640 } 641 642 /* 643 * Reserve memory used for lowcore/command line/kernel image. 644 */ 645 static void __init reserve_kernel(void) 646 { 647 unsigned long start_pfn = PFN_UP(__pa(&_end)); 648 649 #ifdef CONFIG_DMA_API_DEBUG 650 /* 651 * DMA_API_DEBUG code stumbles over addresses from the 652 * range [_ehead, _stext]. Mark the memory as reserved 653 * so it is not used for CONFIG_DMA_API_DEBUG=y. 654 */ 655 memblock_reserve(0, PFN_PHYS(start_pfn)); 656 #else 657 memblock_reserve(0, (unsigned long)_ehead); 658 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 659 - (unsigned long)_stext); 660 #endif 661 } 662 663 static void __init reserve_elfcorehdr(void) 664 { 665 #ifdef CONFIG_CRASH_DUMP 666 if (is_kdump_kernel()) 667 memblock_reserve(elfcorehdr_addr - OLDMEM_BASE, 668 PAGE_ALIGN(elfcorehdr_size)); 669 #endif 670 } 671 672 static void __init setup_memory(void) 673 { 674 struct memblock_region *reg; 675 676 /* 677 * Init storage key for present memory 678 */ 679 for_each_memblock(memory, reg) { 680 storage_key_init_range(reg->base, reg->base + reg->size); 681 } 682 psw_set_key(PAGE_DEFAULT_KEY); 683 684 /* Only cosmetics */ 685 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 686 } 687 688 /* 689 * Setup hardware capabilities. 690 */ 691 static void __init setup_hwcaps(void) 692 { 693 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 694 struct cpuid cpu_id; 695 int i; 696 697 /* 698 * The store facility list bits numbers as found in the principles 699 * of operation are numbered with bit 1UL<<31 as number 0 to 700 * bit 1UL<<0 as number 31. 701 * Bit 0: instructions named N3, "backported" to esa-mode 702 * Bit 2: z/Architecture mode is active 703 * Bit 7: the store-facility-list-extended facility is installed 704 * Bit 17: the message-security assist is installed 705 * Bit 19: the long-displacement facility is installed 706 * Bit 21: the extended-immediate facility is installed 707 * Bit 22: extended-translation facility 3 is installed 708 * Bit 30: extended-translation facility 3 enhancement facility 709 * These get translated to: 710 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 711 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 712 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 713 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 714 */ 715 for (i = 0; i < 6; i++) 716 if (test_facility(stfl_bits[i])) 717 elf_hwcap |= 1UL << i; 718 719 if (test_facility(22) && test_facility(30)) 720 elf_hwcap |= HWCAP_S390_ETF3EH; 721 722 /* 723 * Check for additional facilities with store-facility-list-extended. 724 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 725 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 726 * as stored by stfl, bits 32-xxx contain additional facilities. 727 * How many facility words are stored depends on the number of 728 * doublewords passed to the instruction. The additional facilities 729 * are: 730 * Bit 42: decimal floating point facility is installed 731 * Bit 44: perform floating point operation facility is installed 732 * translated to: 733 * HWCAP_S390_DFP bit 6 (42 && 44). 734 */ 735 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 736 elf_hwcap |= HWCAP_S390_DFP; 737 738 /* 739 * Huge page support HWCAP_S390_HPAGE is bit 7. 740 */ 741 if (MACHINE_HAS_HPAGE) 742 elf_hwcap |= HWCAP_S390_HPAGE; 743 744 /* 745 * 64-bit register support for 31-bit processes 746 * HWCAP_S390_HIGH_GPRS is bit 9. 747 */ 748 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 749 750 /* 751 * Transactional execution support HWCAP_S390_TE is bit 10. 752 */ 753 if (test_facility(50) && test_facility(73)) 754 elf_hwcap |= HWCAP_S390_TE; 755 756 /* 757 * Vector extension HWCAP_S390_VXRS is bit 11. 758 */ 759 if (test_facility(129)) 760 elf_hwcap |= HWCAP_S390_VXRS; 761 get_cpu_id(&cpu_id); 762 add_device_randomness(&cpu_id, sizeof(cpu_id)); 763 switch (cpu_id.machine) { 764 case 0x9672: 765 strcpy(elf_platform, "g5"); 766 break; 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 } 797 798 /* 799 * Add system information as device randomness 800 */ 801 static void __init setup_randomness(void) 802 { 803 struct sysinfo_3_2_2 *vmms; 804 805 vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL); 806 if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count) 807 add_device_randomness(&vmms, vmms->count); 808 free_page((unsigned long) vmms); 809 } 810 811 /* 812 * Setup function called from init/main.c just after the banner 813 * was printed. 814 */ 815 816 void __init setup_arch(char **cmdline_p) 817 { 818 /* 819 * print what head.S has found out about the machine 820 */ 821 if (MACHINE_IS_VM) 822 pr_info("Linux is running as a z/VM " 823 "guest operating system in 64-bit mode\n"); 824 else if (MACHINE_IS_KVM) 825 pr_info("Linux is running under KVM in 64-bit mode\n"); 826 else if (MACHINE_IS_LPAR) 827 pr_info("Linux is running natively in 64-bit mode\n"); 828 829 /* Have one command line that is parsed and saved in /proc/cmdline */ 830 /* boot_command_line has been already set up in early.c */ 831 *cmdline_p = boot_command_line; 832 833 ROOT_DEV = Root_RAM0; 834 835 /* Is init_mm really needed? */ 836 init_mm.start_code = PAGE_OFFSET; 837 init_mm.end_code = (unsigned long) &_etext; 838 init_mm.end_data = (unsigned long) &_edata; 839 init_mm.brk = (unsigned long) &_end; 840 841 parse_early_param(); 842 os_info_init(); 843 setup_ipl(); 844 845 /* Do some memory reservations *before* memory is added to memblock */ 846 reserve_memory_end(); 847 reserve_oldmem(); 848 reserve_kernel(); 849 reserve_initrd(); 850 reserve_elfcorehdr(); 851 memblock_allow_resize(); 852 853 /* Get information about *all* installed memory */ 854 detect_memory_memblock(); 855 856 remove_oldmem(); 857 858 /* 859 * Make sure all chunks are MAX_ORDER aligned so we don't need the 860 * extra checks that HOLES_IN_ZONE would require. 861 * 862 * Is this still required? 863 */ 864 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT)); 865 866 setup_memory_end(); 867 setup_memory(); 868 869 check_initrd(); 870 reserve_crashkernel(); 871 /* 872 * Be aware that smp_save_dump_cpus() triggers a system reset. 873 * Therefore CPU and device initialization should be done afterwards. 874 */ 875 smp_save_dump_cpus(); 876 877 setup_resources(); 878 setup_vmcoreinfo(); 879 setup_lowcore(); 880 smp_fill_possible_mask(); 881 cpu_init(); 882 883 /* 884 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 885 */ 886 setup_hwcaps(); 887 888 /* 889 * Create kernel page tables and switch to virtual addressing. 890 */ 891 paging_init(); 892 893 /* Setup default console */ 894 conmode_default(); 895 set_preferred_console(); 896 897 /* Setup zfcpdump support */ 898 setup_zfcpdump(); 899 900 /* Add system specific data to the random pool */ 901 setup_randomness(); 902 } 903