1 /* 2 * arch/s390/kernel/setup.c 3 * 4 * S390 version 5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * Author(s): Hartmut Penner (hp@de.ibm.com), 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 * 9 * Derived from "arch/i386/kernel/setup.c" 10 * Copyright (C) 1995, Linus Torvalds 11 */ 12 13 /* 14 * This file handles the architecture-dependent parts of initialization 15 */ 16 17 #define KMSG_COMPONENT "setup" 18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 19 20 #include <linux/errno.h> 21 #include <linux/module.h> 22 #include <linux/sched.h> 23 #include <linux/kernel.h> 24 #include <linux/mm.h> 25 #include <linux/stddef.h> 26 #include <linux/unistd.h> 27 #include <linux/ptrace.h> 28 #include <linux/slab.h> 29 #include <linux/user.h> 30 #include <linux/tty.h> 31 #include <linux/ioport.h> 32 #include <linux/delay.h> 33 #include <linux/init.h> 34 #include <linux/initrd.h> 35 #include <linux/bootmem.h> 36 #include <linux/root_dev.h> 37 #include <linux/console.h> 38 #include <linux/kernel_stat.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 46 #include <asm/ipl.h> 47 #include <asm/uaccess.h> 48 #include <asm/system.h> 49 #include <asm/smp.h> 50 #include <asm/mmu_context.h> 51 #include <asm/cpcmd.h> 52 #include <asm/lowcore.h> 53 #include <asm/irq.h> 54 #include <asm/page.h> 55 #include <asm/ptrace.h> 56 #include <asm/sections.h> 57 #include <asm/ebcdic.h> 58 #include <asm/compat.h> 59 #include <asm/kvm_virtio.h> 60 61 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY | 62 PSW_MASK_MCHECK | PSW_DEFAULT_KEY); 63 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 64 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 65 PSW_MASK_PSTATE | PSW_DEFAULT_KEY); 66 67 /* 68 * User copy operations. 69 */ 70 struct uaccess_ops uaccess; 71 EXPORT_SYMBOL(uaccess); 72 73 /* 74 * Machine setup.. 75 */ 76 unsigned int console_mode = 0; 77 unsigned int console_devno = -1; 78 unsigned int console_irq = -1; 79 unsigned long machine_flags; 80 unsigned long elf_hwcap = 0; 81 char elf_platform[ELF_PLATFORM_SIZE]; 82 83 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS]; 84 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ 85 static unsigned long __initdata memory_end; 86 87 /* 88 * This is set up by the setup-routine at boot-time 89 * for S390 need to find out, what we have to setup 90 * using address 0x10400 ... 91 */ 92 93 #include <asm/setup.h> 94 95 static struct resource code_resource = { 96 .name = "Kernel code", 97 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 98 }; 99 100 static struct resource data_resource = { 101 .name = "Kernel data", 102 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 103 }; 104 105 /* 106 * cpu_init() initializes state that is per-CPU. 107 */ 108 void __cpuinit cpu_init(void) 109 { 110 int addr = hard_smp_processor_id(); 111 112 /* 113 * Store processor id in lowcore (used e.g. in timer_interrupt) 114 */ 115 get_cpu_id(&S390_lowcore.cpu_data.cpu_id); 116 S390_lowcore.cpu_data.cpu_addr = addr; 117 118 /* 119 * Force FPU initialization: 120 */ 121 clear_thread_flag(TIF_USEDFPU); 122 clear_used_math(); 123 124 atomic_inc(&init_mm.mm_count); 125 current->active_mm = &init_mm; 126 if (current->mm) 127 BUG(); 128 enter_lazy_tlb(&init_mm, current); 129 } 130 131 /* 132 * condev= and conmode= setup parameter. 133 */ 134 135 static int __init condev_setup(char *str) 136 { 137 int vdev; 138 139 vdev = simple_strtoul(str, &str, 0); 140 if (vdev >= 0 && vdev < 65536) { 141 console_devno = vdev; 142 console_irq = -1; 143 } 144 return 1; 145 } 146 147 __setup("condev=", condev_setup); 148 149 static int __init conmode_setup(char *str) 150 { 151 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 152 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 153 SET_CONSOLE_SCLP; 154 #endif 155 #if defined(CONFIG_TN3215_CONSOLE) 156 if (strncmp(str, "3215", 5) == 0) 157 SET_CONSOLE_3215; 158 #endif 159 #if defined(CONFIG_TN3270_CONSOLE) 160 if (strncmp(str, "3270", 5) == 0) 161 SET_CONSOLE_3270; 162 #endif 163 return 1; 164 } 165 166 __setup("conmode=", conmode_setup); 167 168 static void __init conmode_default(void) 169 { 170 char query_buffer[1024]; 171 char *ptr; 172 173 if (MACHINE_IS_VM) { 174 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 175 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 176 ptr = strstr(query_buffer, "SUBCHANNEL ="); 177 console_irq = simple_strtoul(ptr + 13, NULL, 16); 178 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 179 ptr = strstr(query_buffer, "CONMODE"); 180 /* 181 * Set the conmode to 3215 so that the device recognition 182 * will set the cu_type of the console to 3215. If the 183 * conmode is 3270 and we don't set it back then both 184 * 3215 and the 3270 driver will try to access the console 185 * device (3215 as console and 3270 as normal tty). 186 */ 187 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 188 if (ptr == NULL) { 189 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 190 SET_CONSOLE_SCLP; 191 #endif 192 return; 193 } 194 if (strncmp(ptr + 8, "3270", 4) == 0) { 195 #if defined(CONFIG_TN3270_CONSOLE) 196 SET_CONSOLE_3270; 197 #elif defined(CONFIG_TN3215_CONSOLE) 198 SET_CONSOLE_3215; 199 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 200 SET_CONSOLE_SCLP; 201 #endif 202 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 203 #if defined(CONFIG_TN3215_CONSOLE) 204 SET_CONSOLE_3215; 205 #elif defined(CONFIG_TN3270_CONSOLE) 206 SET_CONSOLE_3270; 207 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 208 SET_CONSOLE_SCLP; 209 #endif 210 } 211 } else { 212 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 213 SET_CONSOLE_SCLP; 214 #endif 215 } 216 } 217 218 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 219 static void __init setup_zfcpdump(unsigned int console_devno) 220 { 221 static char str[41]; 222 223 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 224 return; 225 if (console_devno != -1) 226 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 227 ipl_info.data.fcp.dev_id.devno, console_devno); 228 else 229 sprintf(str, " cio_ignore=all,!0.0.%04x", 230 ipl_info.data.fcp.dev_id.devno); 231 strcat(boot_command_line, str); 232 console_loglevel = 2; 233 } 234 #else 235 static inline void setup_zfcpdump(unsigned int console_devno) {} 236 #endif /* CONFIG_ZFCPDUMP */ 237 238 /* 239 * Reboot, halt and power_off stubs. They just call _machine_restart, 240 * _machine_halt or _machine_power_off. 241 */ 242 243 void machine_restart(char *command) 244 { 245 if ((!in_interrupt() && !in_atomic()) || 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_restart(command); 252 } 253 254 void machine_halt(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_halt(); 263 } 264 265 void machine_power_off(void) 266 { 267 if (!in_interrupt() || oops_in_progress) 268 /* 269 * Only unblank the console if we are called in enabled 270 * context or a bust_spinlocks cleared the way for us. 271 */ 272 console_unblank(); 273 _machine_power_off(); 274 } 275 276 /* 277 * Dummy power off function. 278 */ 279 void (*pm_power_off)(void) = machine_power_off; 280 281 static int __init early_parse_mem(char *p) 282 { 283 memory_end = memparse(p, &p); 284 return 0; 285 } 286 early_param("mem", early_parse_mem); 287 288 #ifdef CONFIG_S390_SWITCH_AMODE 289 #ifdef CONFIG_PGSTE 290 unsigned int switch_amode = 1; 291 #else 292 unsigned int switch_amode = 0; 293 #endif 294 EXPORT_SYMBOL_GPL(switch_amode); 295 296 static int set_amode_and_uaccess(unsigned long user_amode, 297 unsigned long user32_amode) 298 { 299 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 300 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 301 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 302 #ifdef CONFIG_COMPAT 303 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 304 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 305 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 306 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 307 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 308 PSW32_MASK_PSTATE; 309 #endif 310 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 311 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 312 313 if (MACHINE_HAS_MVCOS) { 314 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 315 return 1; 316 } else { 317 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 318 return 0; 319 } 320 } 321 322 /* 323 * Switch kernel/user addressing modes? 324 */ 325 static int __init early_parse_switch_amode(char *p) 326 { 327 switch_amode = 1; 328 return 0; 329 } 330 early_param("switch_amode", early_parse_switch_amode); 331 332 #else /* CONFIG_S390_SWITCH_AMODE */ 333 static inline int set_amode_and_uaccess(unsigned long user_amode, 334 unsigned long user32_amode) 335 { 336 return 0; 337 } 338 #endif /* CONFIG_S390_SWITCH_AMODE */ 339 340 #ifdef CONFIG_S390_EXEC_PROTECT 341 unsigned int s390_noexec = 0; 342 EXPORT_SYMBOL_GPL(s390_noexec); 343 344 /* 345 * Enable execute protection? 346 */ 347 static int __init early_parse_noexec(char *p) 348 { 349 if (!strncmp(p, "off", 3)) 350 return 0; 351 switch_amode = 1; 352 s390_noexec = 1; 353 return 0; 354 } 355 early_param("noexec", early_parse_noexec); 356 #endif /* CONFIG_S390_EXEC_PROTECT */ 357 358 static void setup_addressing_mode(void) 359 { 360 if (s390_noexec) { 361 if (set_amode_and_uaccess(PSW_ASC_SECONDARY, 362 PSW32_ASC_SECONDARY)) 363 pr_info("Execute protection active, " 364 "mvcos available\n"); 365 else 366 pr_info("Execute protection active, " 367 "mvcos not available\n"); 368 } else if (switch_amode) { 369 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY)) 370 pr_info("Address spaces switched, " 371 "mvcos available\n"); 372 else 373 pr_info("Address spaces switched, " 374 "mvcos not available\n"); 375 } 376 #ifdef CONFIG_TRACE_IRQFLAGS 377 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 378 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 379 #endif 380 } 381 382 static void __init 383 setup_lowcore(void) 384 { 385 struct _lowcore *lc; 386 int lc_pages; 387 388 /* 389 * Setup lowcore for boot cpu 390 */ 391 lc_pages = sizeof(void *) == 8 ? 2 : 1; 392 lc = (struct _lowcore *) 393 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 394 memset(lc, 0, lc_pages * PAGE_SIZE); 395 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 396 lc->restart_psw.addr = 397 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 398 if (switch_amode) 399 lc->restart_psw.mask |= PSW_ASC_HOME; 400 lc->external_new_psw.mask = psw_kernel_bits; 401 lc->external_new_psw.addr = 402 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 403 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 404 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 405 lc->program_new_psw.mask = psw_kernel_bits; 406 lc->program_new_psw.addr = 407 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 408 lc->mcck_new_psw.mask = 409 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 410 lc->mcck_new_psw.addr = 411 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 412 lc->io_new_psw.mask = psw_kernel_bits; 413 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 414 lc->ipl_device = S390_lowcore.ipl_device; 415 lc->clock_comparator = -1ULL; 416 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 417 lc->async_stack = (unsigned long) 418 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 419 lc->panic_stack = (unsigned long) 420 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 421 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 422 lc->thread_info = (unsigned long) &init_thread_union; 423 #ifndef CONFIG_64BIT 424 if (MACHINE_HAS_IEEE) { 425 lc->extended_save_area_addr = (__u32) 426 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 427 /* enable extended save area */ 428 __ctl_set_bit(14, 29); 429 } 430 #else 431 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 432 #endif 433 set_prefix((u32)(unsigned long) lc); 434 } 435 436 static void __init 437 setup_resources(void) 438 { 439 struct resource *res, *sub_res; 440 int i; 441 442 code_resource.start = (unsigned long) &_text; 443 code_resource.end = (unsigned long) &_etext - 1; 444 data_resource.start = (unsigned long) &_etext; 445 data_resource.end = (unsigned long) &_edata - 1; 446 447 for (i = 0; i < MEMORY_CHUNKS; i++) { 448 if (!memory_chunk[i].size) 449 continue; 450 res = alloc_bootmem_low(sizeof(struct resource)); 451 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 452 switch (memory_chunk[i].type) { 453 case CHUNK_READ_WRITE: 454 res->name = "System RAM"; 455 break; 456 case CHUNK_READ_ONLY: 457 res->name = "System ROM"; 458 res->flags |= IORESOURCE_READONLY; 459 break; 460 default: 461 res->name = "reserved"; 462 } 463 res->start = memory_chunk[i].addr; 464 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 465 request_resource(&iomem_resource, res); 466 467 if (code_resource.start >= res->start && 468 code_resource.start <= res->end && 469 code_resource.end > res->end) { 470 sub_res = alloc_bootmem_low(sizeof(struct resource)); 471 memcpy(sub_res, &code_resource, 472 sizeof(struct resource)); 473 sub_res->end = res->end; 474 code_resource.start = res->end + 1; 475 request_resource(res, sub_res); 476 } 477 478 if (code_resource.start >= res->start && 479 code_resource.start <= res->end && 480 code_resource.end <= res->end) 481 request_resource(res, &code_resource); 482 483 if (data_resource.start >= res->start && 484 data_resource.start <= res->end && 485 data_resource.end > res->end) { 486 sub_res = alloc_bootmem_low(sizeof(struct resource)); 487 memcpy(sub_res, &data_resource, 488 sizeof(struct resource)); 489 sub_res->end = res->end; 490 data_resource.start = res->end + 1; 491 request_resource(res, sub_res); 492 } 493 494 if (data_resource.start >= res->start && 495 data_resource.start <= res->end && 496 data_resource.end <= res->end) 497 request_resource(res, &data_resource); 498 } 499 } 500 501 unsigned long real_memory_size; 502 EXPORT_SYMBOL_GPL(real_memory_size); 503 504 static void __init setup_memory_end(void) 505 { 506 unsigned long memory_size; 507 unsigned long max_mem; 508 int i; 509 510 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 511 if (ipl_info.type == IPL_TYPE_FCP_DUMP) 512 memory_end = ZFCPDUMP_HSA_SIZE; 513 #endif 514 memory_size = 0; 515 memory_end &= PAGE_MASK; 516 517 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 518 memory_end = min(max_mem, memory_end); 519 520 /* 521 * Make sure all chunks are MAX_ORDER aligned so we don't need the 522 * extra checks that HOLES_IN_ZONE would require. 523 */ 524 for (i = 0; i < MEMORY_CHUNKS; i++) { 525 unsigned long start, end; 526 struct mem_chunk *chunk; 527 unsigned long align; 528 529 chunk = &memory_chunk[i]; 530 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 531 start = (chunk->addr + align - 1) & ~(align - 1); 532 end = (chunk->addr + chunk->size) & ~(align - 1); 533 if (start >= end) 534 memset(chunk, 0, sizeof(*chunk)); 535 else { 536 chunk->addr = start; 537 chunk->size = end - start; 538 } 539 } 540 541 for (i = 0; i < MEMORY_CHUNKS; i++) { 542 struct mem_chunk *chunk = &memory_chunk[i]; 543 544 real_memory_size = max(real_memory_size, 545 chunk->addr + chunk->size); 546 if (chunk->addr >= max_mem) { 547 memset(chunk, 0, sizeof(*chunk)); 548 continue; 549 } 550 if (chunk->addr + chunk->size > max_mem) 551 chunk->size = max_mem - chunk->addr; 552 memory_size = max(memory_size, chunk->addr + chunk->size); 553 } 554 if (!memory_end) 555 memory_end = memory_size; 556 } 557 558 static void __init 559 setup_memory(void) 560 { 561 unsigned long bootmap_size; 562 unsigned long start_pfn, end_pfn; 563 int i; 564 565 /* 566 * partially used pages are not usable - thus 567 * we are rounding upwards: 568 */ 569 start_pfn = PFN_UP(__pa(&_end)); 570 end_pfn = max_pfn = PFN_DOWN(memory_end); 571 572 #ifdef CONFIG_BLK_DEV_INITRD 573 /* 574 * Move the initrd in case the bitmap of the bootmem allocater 575 * would overwrite it. 576 */ 577 578 if (INITRD_START && INITRD_SIZE) { 579 unsigned long bmap_size; 580 unsigned long start; 581 582 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 583 bmap_size = PFN_PHYS(bmap_size); 584 585 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 586 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 587 588 if (start + INITRD_SIZE > memory_end) { 589 pr_err("initrd extends beyond end of " 590 "memory (0x%08lx > 0x%08lx) " 591 "disabling initrd\n", 592 start + INITRD_SIZE, memory_end); 593 INITRD_START = INITRD_SIZE = 0; 594 } else { 595 pr_info("Moving initrd (0x%08lx -> " 596 "0x%08lx, size: %ld)\n", 597 INITRD_START, start, INITRD_SIZE); 598 memmove((void *) start, (void *) INITRD_START, 599 INITRD_SIZE); 600 INITRD_START = start; 601 } 602 } 603 } 604 #endif 605 606 /* 607 * Initialize the boot-time allocator 608 */ 609 bootmap_size = init_bootmem(start_pfn, end_pfn); 610 611 /* 612 * Register RAM areas with the bootmem allocator. 613 */ 614 615 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 616 unsigned long start_chunk, end_chunk, pfn; 617 618 if (memory_chunk[i].type != CHUNK_READ_WRITE) 619 continue; 620 start_chunk = PFN_DOWN(memory_chunk[i].addr); 621 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 622 end_chunk = min(end_chunk, end_pfn); 623 if (start_chunk >= end_chunk) 624 continue; 625 add_active_range(0, start_chunk, end_chunk); 626 pfn = max(start_chunk, start_pfn); 627 for (; pfn < end_chunk; pfn++) 628 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 629 } 630 631 psw_set_key(PAGE_DEFAULT_KEY); 632 633 free_bootmem_with_active_regions(0, max_pfn); 634 635 /* 636 * Reserve memory used for lowcore/command line/kernel image. 637 */ 638 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 639 reserve_bootmem((unsigned long)_stext, 640 PFN_PHYS(start_pfn) - (unsigned long)_stext, 641 BOOTMEM_DEFAULT); 642 /* 643 * Reserve the bootmem bitmap itself as well. We do this in two 644 * steps (first step was init_bootmem()) because this catches 645 * the (very unlikely) case of us accidentally initializing the 646 * bootmem allocator with an invalid RAM area. 647 */ 648 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 649 BOOTMEM_DEFAULT); 650 651 #ifdef CONFIG_BLK_DEV_INITRD 652 if (INITRD_START && INITRD_SIZE) { 653 if (INITRD_START + INITRD_SIZE <= memory_end) { 654 reserve_bootmem(INITRD_START, INITRD_SIZE, 655 BOOTMEM_DEFAULT); 656 initrd_start = INITRD_START; 657 initrd_end = initrd_start + INITRD_SIZE; 658 } else { 659 pr_err("initrd extends beyond end of " 660 "memory (0x%08lx > 0x%08lx) " 661 "disabling initrd\n", 662 initrd_start + INITRD_SIZE, memory_end); 663 initrd_start = initrd_end = 0; 664 } 665 } 666 #endif 667 } 668 669 /* 670 * Setup hardware capabilities. 671 */ 672 static void __init setup_hwcaps(void) 673 { 674 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 675 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; 676 unsigned long long facility_list_extended; 677 unsigned int facility_list; 678 int i; 679 680 facility_list = stfl(); 681 /* 682 * The store facility list bits numbers as found in the principles 683 * of operation are numbered with bit 1UL<<31 as number 0 to 684 * bit 1UL<<0 as number 31. 685 * Bit 0: instructions named N3, "backported" to esa-mode 686 * Bit 2: z/Architecture mode is active 687 * Bit 7: the store-facility-list-extended facility is installed 688 * Bit 17: the message-security assist is installed 689 * Bit 19: the long-displacement facility is installed 690 * Bit 21: the extended-immediate facility is installed 691 * These get translated to: 692 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 693 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 694 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5. 695 */ 696 for (i = 0; i < 6; i++) 697 if (facility_list & (1UL << (31 - stfl_bits[i]))) 698 elf_hwcap |= 1UL << i; 699 700 /* 701 * Check for additional facilities with store-facility-list-extended. 702 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 703 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 704 * as stored by stfl, bits 32-xxx contain additional facilities. 705 * How many facility words are stored depends on the number of 706 * doublewords passed to the instruction. The additional facilites 707 * are: 708 * Bit 43: decimal floating point facility is installed 709 * translated to: 710 * HWCAP_S390_DFP bit 6. 711 */ 712 if ((elf_hwcap & (1UL << 2)) && 713 __stfle(&facility_list_extended, 1) > 0) { 714 if (facility_list_extended & (1ULL << (64 - 43))) 715 elf_hwcap |= 1UL << 6; 716 } 717 718 if (MACHINE_HAS_HPAGE) 719 elf_hwcap |= 1UL << 7; 720 721 switch (cpuinfo->cpu_id.machine) { 722 case 0x9672: 723 #if !defined(CONFIG_64BIT) 724 default: /* Use "g5" as default for 31 bit kernels. */ 725 #endif 726 strcpy(elf_platform, "g5"); 727 break; 728 case 0x2064: 729 case 0x2066: 730 #if defined(CONFIG_64BIT) 731 default: /* Use "z900" as default for 64 bit kernels. */ 732 #endif 733 strcpy(elf_platform, "z900"); 734 break; 735 case 0x2084: 736 case 0x2086: 737 strcpy(elf_platform, "z990"); 738 break; 739 case 0x2094: 740 case 0x2096: 741 strcpy(elf_platform, "z9-109"); 742 break; 743 case 0x2097: 744 case 0x2098: 745 strcpy(elf_platform, "z10"); 746 break; 747 } 748 } 749 750 /* 751 * Setup function called from init/main.c just after the banner 752 * was printed. 753 */ 754 755 void __init 756 setup_arch(char **cmdline_p) 757 { 758 /* set up preferred console */ 759 add_preferred_console("ttyS", 0, NULL); 760 761 /* 762 * print what head.S has found out about the machine 763 */ 764 #ifndef CONFIG_64BIT 765 if (MACHINE_IS_VM) 766 pr_info("Linux is running as a z/VM " 767 "guest operating system in 31-bit mode\n"); 768 else 769 pr_info("Linux is running natively in 31-bit mode\n"); 770 if (MACHINE_HAS_IEEE) 771 pr_info("The hardware system has IEEE compatible " 772 "floating point units\n"); 773 else 774 pr_info("The hardware system has no IEEE compatible " 775 "floating point units\n"); 776 #else /* CONFIG_64BIT */ 777 if (MACHINE_IS_VM) 778 pr_info("Linux is running as a z/VM " 779 "guest operating system in 64-bit mode\n"); 780 else if (MACHINE_IS_KVM) { 781 pr_info("Linux is running under KVM in 64-bit mode\n"); 782 add_preferred_console("hvc", 0, NULL); 783 s390_virtio_console_init(); 784 } else 785 pr_info("Linux is running natively in 64-bit mode\n"); 786 #endif /* CONFIG_64BIT */ 787 788 /* Have one command line that is parsed and saved in /proc/cmdline */ 789 /* boot_command_line has been already set up in early.c */ 790 *cmdline_p = boot_command_line; 791 792 ROOT_DEV = Root_RAM0; 793 794 init_mm.start_code = PAGE_OFFSET; 795 init_mm.end_code = (unsigned long) &_etext; 796 init_mm.end_data = (unsigned long) &_edata; 797 init_mm.brk = (unsigned long) &_end; 798 799 if (MACHINE_HAS_MVCOS) 800 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 801 else 802 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 803 804 parse_early_param(); 805 806 setup_ipl(); 807 setup_memory_end(); 808 setup_addressing_mode(); 809 setup_memory(); 810 setup_resources(); 811 setup_lowcore(); 812 813 cpu_init(); 814 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 815 s390_init_cpu_topology(); 816 817 /* 818 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 819 */ 820 setup_hwcaps(); 821 822 /* 823 * Create kernel page tables and switch to virtual addressing. 824 */ 825 paging_init(); 826 827 /* Setup default console */ 828 conmode_default(); 829 830 /* Setup zfcpdump support */ 831 setup_zfcpdump(console_devno); 832 } 833