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 86 int __initdata memory_end_set; 87 unsigned long __initdata memory_end; 88 89 /* 90 * This is set up by the setup-routine at boot-time 91 * for S390 need to find out, what we have to setup 92 * using address 0x10400 ... 93 */ 94 95 #include <asm/setup.h> 96 97 static struct resource code_resource = { 98 .name = "Kernel code", 99 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 100 }; 101 102 static struct resource data_resource = { 103 .name = "Kernel data", 104 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 105 }; 106 107 /* 108 * cpu_init() initializes state that is per-CPU. 109 */ 110 void __cpuinit cpu_init(void) 111 { 112 int addr = hard_smp_processor_id(); 113 114 /* 115 * Store processor id in lowcore (used e.g. in timer_interrupt) 116 */ 117 get_cpu_id(&S390_lowcore.cpu_data.cpu_id); 118 S390_lowcore.cpu_data.cpu_addr = addr; 119 120 /* 121 * Force FPU initialization: 122 */ 123 clear_thread_flag(TIF_USEDFPU); 124 clear_used_math(); 125 126 atomic_inc(&init_mm.mm_count); 127 current->active_mm = &init_mm; 128 if (current->mm) 129 BUG(); 130 enter_lazy_tlb(&init_mm, current); 131 } 132 133 /* 134 * condev= and conmode= setup parameter. 135 */ 136 137 static int __init condev_setup(char *str) 138 { 139 int vdev; 140 141 vdev = simple_strtoul(str, &str, 0); 142 if (vdev >= 0 && vdev < 65536) { 143 console_devno = vdev; 144 console_irq = -1; 145 } 146 return 1; 147 } 148 149 __setup("condev=", condev_setup); 150 151 static int __init conmode_setup(char *str) 152 { 153 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 154 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 155 SET_CONSOLE_SCLP; 156 #endif 157 #if defined(CONFIG_TN3215_CONSOLE) 158 if (strncmp(str, "3215", 5) == 0) 159 SET_CONSOLE_3215; 160 #endif 161 #if defined(CONFIG_TN3270_CONSOLE) 162 if (strncmp(str, "3270", 5) == 0) 163 SET_CONSOLE_3270; 164 #endif 165 return 1; 166 } 167 168 __setup("conmode=", conmode_setup); 169 170 static void __init conmode_default(void) 171 { 172 char query_buffer[1024]; 173 char *ptr; 174 175 if (MACHINE_IS_VM) { 176 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 177 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 178 ptr = strstr(query_buffer, "SUBCHANNEL ="); 179 console_irq = simple_strtoul(ptr + 13, NULL, 16); 180 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 181 ptr = strstr(query_buffer, "CONMODE"); 182 /* 183 * Set the conmode to 3215 so that the device recognition 184 * will set the cu_type of the console to 3215. If the 185 * conmode is 3270 and we don't set it back then both 186 * 3215 and the 3270 driver will try to access the console 187 * device (3215 as console and 3270 as normal tty). 188 */ 189 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 190 if (ptr == NULL) { 191 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 192 SET_CONSOLE_SCLP; 193 #endif 194 return; 195 } 196 if (strncmp(ptr + 8, "3270", 4) == 0) { 197 #if defined(CONFIG_TN3270_CONSOLE) 198 SET_CONSOLE_3270; 199 #elif defined(CONFIG_TN3215_CONSOLE) 200 SET_CONSOLE_3215; 201 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 202 SET_CONSOLE_SCLP; 203 #endif 204 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 205 #if defined(CONFIG_TN3215_CONSOLE) 206 SET_CONSOLE_3215; 207 #elif defined(CONFIG_TN3270_CONSOLE) 208 SET_CONSOLE_3270; 209 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 210 SET_CONSOLE_SCLP; 211 #endif 212 } 213 } else { 214 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 215 SET_CONSOLE_SCLP; 216 #endif 217 } 218 } 219 220 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 221 static void __init setup_zfcpdump(unsigned int console_devno) 222 { 223 static char str[41]; 224 225 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 226 return; 227 if (console_devno != -1) 228 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 229 ipl_info.data.fcp.dev_id.devno, console_devno); 230 else 231 sprintf(str, " cio_ignore=all,!0.0.%04x", 232 ipl_info.data.fcp.dev_id.devno); 233 strcat(boot_command_line, str); 234 console_loglevel = 2; 235 } 236 #else 237 static inline void setup_zfcpdump(unsigned int console_devno) {} 238 #endif /* CONFIG_ZFCPDUMP */ 239 240 /* 241 * Reboot, halt and power_off stubs. They just call _machine_restart, 242 * _machine_halt or _machine_power_off. 243 */ 244 245 void machine_restart(char *command) 246 { 247 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 248 /* 249 * Only unblank the console if we are called in enabled 250 * context or a bust_spinlocks cleared the way for us. 251 */ 252 console_unblank(); 253 _machine_restart(command); 254 } 255 256 void machine_halt(void) 257 { 258 if (!in_interrupt() || oops_in_progress) 259 /* 260 * Only unblank the console if we are called in enabled 261 * context or a bust_spinlocks cleared the way for us. 262 */ 263 console_unblank(); 264 _machine_halt(); 265 } 266 267 void machine_power_off(void) 268 { 269 if (!in_interrupt() || oops_in_progress) 270 /* 271 * Only unblank the console if we are called in enabled 272 * context or a bust_spinlocks cleared the way for us. 273 */ 274 console_unblank(); 275 _machine_power_off(); 276 } 277 278 /* 279 * Dummy power off function. 280 */ 281 void (*pm_power_off)(void) = machine_power_off; 282 283 static int __init early_parse_mem(char *p) 284 { 285 memory_end = memparse(p, &p); 286 memory_end_set = 1; 287 return 0; 288 } 289 early_param("mem", early_parse_mem); 290 291 #ifdef CONFIG_S390_SWITCH_AMODE 292 #ifdef CONFIG_PGSTE 293 unsigned int switch_amode = 1; 294 #else 295 unsigned int switch_amode = 0; 296 #endif 297 EXPORT_SYMBOL_GPL(switch_amode); 298 299 static int set_amode_and_uaccess(unsigned long user_amode, 300 unsigned long user32_amode) 301 { 302 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 303 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 304 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 305 #ifdef CONFIG_COMPAT 306 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 307 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 308 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 309 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 310 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 311 PSW32_MASK_PSTATE; 312 #endif 313 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 314 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 315 316 if (MACHINE_HAS_MVCOS) { 317 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 318 return 1; 319 } else { 320 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 321 return 0; 322 } 323 } 324 325 /* 326 * Switch kernel/user addressing modes? 327 */ 328 static int __init early_parse_switch_amode(char *p) 329 { 330 switch_amode = 1; 331 return 0; 332 } 333 early_param("switch_amode", early_parse_switch_amode); 334 335 #else /* CONFIG_S390_SWITCH_AMODE */ 336 static inline int set_amode_and_uaccess(unsigned long user_amode, 337 unsigned long user32_amode) 338 { 339 return 0; 340 } 341 #endif /* CONFIG_S390_SWITCH_AMODE */ 342 343 #ifdef CONFIG_S390_EXEC_PROTECT 344 unsigned int s390_noexec = 0; 345 EXPORT_SYMBOL_GPL(s390_noexec); 346 347 /* 348 * Enable execute protection? 349 */ 350 static int __init early_parse_noexec(char *p) 351 { 352 if (!strncmp(p, "off", 3)) 353 return 0; 354 switch_amode = 1; 355 s390_noexec = 1; 356 return 0; 357 } 358 early_param("noexec", early_parse_noexec); 359 #endif /* CONFIG_S390_EXEC_PROTECT */ 360 361 static void setup_addressing_mode(void) 362 { 363 if (s390_noexec) { 364 if (set_amode_and_uaccess(PSW_ASC_SECONDARY, 365 PSW32_ASC_SECONDARY)) 366 pr_info("Execute protection active, " 367 "mvcos available\n"); 368 else 369 pr_info("Execute protection active, " 370 "mvcos not available\n"); 371 } else if (switch_amode) { 372 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY)) 373 pr_info("Address spaces switched, " 374 "mvcos available\n"); 375 else 376 pr_info("Address spaces switched, " 377 "mvcos not available\n"); 378 } 379 #ifdef CONFIG_TRACE_IRQFLAGS 380 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 381 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 382 #endif 383 } 384 385 static void __init 386 setup_lowcore(void) 387 { 388 struct _lowcore *lc; 389 int lc_pages; 390 391 /* 392 * Setup lowcore for boot cpu 393 */ 394 lc_pages = sizeof(void *) == 8 ? 2 : 1; 395 lc = (struct _lowcore *) 396 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 397 memset(lc, 0, lc_pages * PAGE_SIZE); 398 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 399 lc->restart_psw.addr = 400 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 401 if (switch_amode) 402 lc->restart_psw.mask |= PSW_ASC_HOME; 403 lc->external_new_psw.mask = psw_kernel_bits; 404 lc->external_new_psw.addr = 405 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 406 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 407 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 408 lc->program_new_psw.mask = psw_kernel_bits; 409 lc->program_new_psw.addr = 410 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 411 lc->mcck_new_psw.mask = 412 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 413 lc->mcck_new_psw.addr = 414 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 415 lc->io_new_psw.mask = psw_kernel_bits; 416 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 417 lc->ipl_device = S390_lowcore.ipl_device; 418 lc->clock_comparator = -1ULL; 419 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 420 lc->async_stack = (unsigned long) 421 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 422 lc->panic_stack = (unsigned long) 423 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 424 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 425 lc->thread_info = (unsigned long) &init_thread_union; 426 #ifndef CONFIG_64BIT 427 if (MACHINE_HAS_IEEE) { 428 lc->extended_save_area_addr = (__u32) 429 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 430 /* enable extended save area */ 431 __ctl_set_bit(14, 29); 432 } 433 #else 434 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 435 #endif 436 set_prefix((u32)(unsigned long) lc); 437 } 438 439 static void __init 440 setup_resources(void) 441 { 442 struct resource *res, *sub_res; 443 int i; 444 445 code_resource.start = (unsigned long) &_text; 446 code_resource.end = (unsigned long) &_etext - 1; 447 data_resource.start = (unsigned long) &_etext; 448 data_resource.end = (unsigned long) &_edata - 1; 449 450 for (i = 0; i < MEMORY_CHUNKS; i++) { 451 if (!memory_chunk[i].size) 452 continue; 453 res = alloc_bootmem_low(sizeof(struct resource)); 454 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 455 switch (memory_chunk[i].type) { 456 case CHUNK_READ_WRITE: 457 res->name = "System RAM"; 458 break; 459 case CHUNK_READ_ONLY: 460 res->name = "System ROM"; 461 res->flags |= IORESOURCE_READONLY; 462 break; 463 default: 464 res->name = "reserved"; 465 } 466 res->start = memory_chunk[i].addr; 467 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 468 request_resource(&iomem_resource, res); 469 470 if (code_resource.start >= res->start && 471 code_resource.start <= res->end && 472 code_resource.end > res->end) { 473 sub_res = alloc_bootmem_low(sizeof(struct resource)); 474 memcpy(sub_res, &code_resource, 475 sizeof(struct resource)); 476 sub_res->end = res->end; 477 code_resource.start = res->end + 1; 478 request_resource(res, sub_res); 479 } 480 481 if (code_resource.start >= res->start && 482 code_resource.start <= res->end && 483 code_resource.end <= res->end) 484 request_resource(res, &code_resource); 485 486 if (data_resource.start >= res->start && 487 data_resource.start <= res->end && 488 data_resource.end > res->end) { 489 sub_res = alloc_bootmem_low(sizeof(struct resource)); 490 memcpy(sub_res, &data_resource, 491 sizeof(struct resource)); 492 sub_res->end = res->end; 493 data_resource.start = res->end + 1; 494 request_resource(res, sub_res); 495 } 496 497 if (data_resource.start >= res->start && 498 data_resource.start <= res->end && 499 data_resource.end <= res->end) 500 request_resource(res, &data_resource); 501 } 502 } 503 504 unsigned long real_memory_size; 505 EXPORT_SYMBOL_GPL(real_memory_size); 506 507 static void __init setup_memory_end(void) 508 { 509 unsigned long memory_size; 510 unsigned long max_mem; 511 int i; 512 513 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 514 if (ipl_info.type == IPL_TYPE_FCP_DUMP) { 515 memory_end = ZFCPDUMP_HSA_SIZE; 516 memory_end_set = 1; 517 } 518 #endif 519 memory_size = 0; 520 memory_end &= PAGE_MASK; 521 522 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 523 memory_end = min(max_mem, memory_end); 524 525 /* 526 * Make sure all chunks are MAX_ORDER aligned so we don't need the 527 * extra checks that HOLES_IN_ZONE would require. 528 */ 529 for (i = 0; i < MEMORY_CHUNKS; i++) { 530 unsigned long start, end; 531 struct mem_chunk *chunk; 532 unsigned long align; 533 534 chunk = &memory_chunk[i]; 535 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 536 start = (chunk->addr + align - 1) & ~(align - 1); 537 end = (chunk->addr + chunk->size) & ~(align - 1); 538 if (start >= end) 539 memset(chunk, 0, sizeof(*chunk)); 540 else { 541 chunk->addr = start; 542 chunk->size = end - start; 543 } 544 } 545 546 for (i = 0; i < MEMORY_CHUNKS; i++) { 547 struct mem_chunk *chunk = &memory_chunk[i]; 548 549 real_memory_size = max(real_memory_size, 550 chunk->addr + chunk->size); 551 if (chunk->addr >= max_mem) { 552 memset(chunk, 0, sizeof(*chunk)); 553 continue; 554 } 555 if (chunk->addr + chunk->size > max_mem) 556 chunk->size = max_mem - chunk->addr; 557 memory_size = max(memory_size, chunk->addr + chunk->size); 558 } 559 if (!memory_end) 560 memory_end = memory_size; 561 } 562 563 static void __init 564 setup_memory(void) 565 { 566 unsigned long bootmap_size; 567 unsigned long start_pfn, end_pfn; 568 int i; 569 570 /* 571 * partially used pages are not usable - thus 572 * we are rounding upwards: 573 */ 574 start_pfn = PFN_UP(__pa(&_end)); 575 end_pfn = max_pfn = PFN_DOWN(memory_end); 576 577 #ifdef CONFIG_BLK_DEV_INITRD 578 /* 579 * Move the initrd in case the bitmap of the bootmem allocater 580 * would overwrite it. 581 */ 582 583 if (INITRD_START && INITRD_SIZE) { 584 unsigned long bmap_size; 585 unsigned long start; 586 587 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 588 bmap_size = PFN_PHYS(bmap_size); 589 590 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 591 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 592 593 if (start + INITRD_SIZE > memory_end) { 594 pr_err("initrd extends beyond end of " 595 "memory (0x%08lx > 0x%08lx) " 596 "disabling initrd\n", 597 start + INITRD_SIZE, memory_end); 598 INITRD_START = INITRD_SIZE = 0; 599 } else { 600 pr_info("Moving initrd (0x%08lx -> " 601 "0x%08lx, size: %ld)\n", 602 INITRD_START, start, INITRD_SIZE); 603 memmove((void *) start, (void *) INITRD_START, 604 INITRD_SIZE); 605 INITRD_START = start; 606 } 607 } 608 } 609 #endif 610 611 /* 612 * Initialize the boot-time allocator 613 */ 614 bootmap_size = init_bootmem(start_pfn, end_pfn); 615 616 /* 617 * Register RAM areas with the bootmem allocator. 618 */ 619 620 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 621 unsigned long start_chunk, end_chunk, pfn; 622 623 if (memory_chunk[i].type != CHUNK_READ_WRITE) 624 continue; 625 start_chunk = PFN_DOWN(memory_chunk[i].addr); 626 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 627 end_chunk = min(end_chunk, end_pfn); 628 if (start_chunk >= end_chunk) 629 continue; 630 add_active_range(0, start_chunk, end_chunk); 631 pfn = max(start_chunk, start_pfn); 632 for (; pfn < end_chunk; pfn++) 633 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 634 } 635 636 psw_set_key(PAGE_DEFAULT_KEY); 637 638 free_bootmem_with_active_regions(0, max_pfn); 639 640 /* 641 * Reserve memory used for lowcore/command line/kernel image. 642 */ 643 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 644 reserve_bootmem((unsigned long)_stext, 645 PFN_PHYS(start_pfn) - (unsigned long)_stext, 646 BOOTMEM_DEFAULT); 647 /* 648 * Reserve the bootmem bitmap itself as well. We do this in two 649 * steps (first step was init_bootmem()) because this catches 650 * the (very unlikely) case of us accidentally initializing the 651 * bootmem allocator with an invalid RAM area. 652 */ 653 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 654 BOOTMEM_DEFAULT); 655 656 #ifdef CONFIG_BLK_DEV_INITRD 657 if (INITRD_START && INITRD_SIZE) { 658 if (INITRD_START + INITRD_SIZE <= memory_end) { 659 reserve_bootmem(INITRD_START, INITRD_SIZE, 660 BOOTMEM_DEFAULT); 661 initrd_start = INITRD_START; 662 initrd_end = initrd_start + INITRD_SIZE; 663 } else { 664 pr_err("initrd extends beyond end of " 665 "memory (0x%08lx > 0x%08lx) " 666 "disabling initrd\n", 667 initrd_start + INITRD_SIZE, memory_end); 668 initrd_start = initrd_end = 0; 669 } 670 } 671 #endif 672 } 673 674 /* 675 * Setup hardware capabilities. 676 */ 677 static void __init setup_hwcaps(void) 678 { 679 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 680 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; 681 unsigned long long facility_list_extended; 682 unsigned int facility_list; 683 int i; 684 685 facility_list = stfl(); 686 /* 687 * The store facility list bits numbers as found in the principles 688 * of operation are numbered with bit 1UL<<31 as number 0 to 689 * bit 1UL<<0 as number 31. 690 * Bit 0: instructions named N3, "backported" to esa-mode 691 * Bit 2: z/Architecture mode is active 692 * Bit 7: the store-facility-list-extended facility is installed 693 * Bit 17: the message-security assist is installed 694 * Bit 19: the long-displacement facility is installed 695 * Bit 21: the extended-immediate facility is installed 696 * These get translated to: 697 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 698 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 699 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5. 700 */ 701 for (i = 0; i < 6; i++) 702 if (facility_list & (1UL << (31 - stfl_bits[i]))) 703 elf_hwcap |= 1UL << i; 704 705 /* 706 * Check for additional facilities with store-facility-list-extended. 707 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 708 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 709 * as stored by stfl, bits 32-xxx contain additional facilities. 710 * How many facility words are stored depends on the number of 711 * doublewords passed to the instruction. The additional facilites 712 * are: 713 * Bit 43: decimal floating point facility is installed 714 * translated to: 715 * HWCAP_S390_DFP bit 6. 716 */ 717 if ((elf_hwcap & (1UL << 2)) && 718 __stfle(&facility_list_extended, 1) > 0) { 719 if (facility_list_extended & (1ULL << (64 - 43))) 720 elf_hwcap |= 1UL << 6; 721 } 722 723 if (MACHINE_HAS_HPAGE) 724 elf_hwcap |= 1UL << 7; 725 726 switch (cpuinfo->cpu_id.machine) { 727 case 0x9672: 728 #if !defined(CONFIG_64BIT) 729 default: /* Use "g5" as default for 31 bit kernels. */ 730 #endif 731 strcpy(elf_platform, "g5"); 732 break; 733 case 0x2064: 734 case 0x2066: 735 #if defined(CONFIG_64BIT) 736 default: /* Use "z900" as default for 64 bit kernels. */ 737 #endif 738 strcpy(elf_platform, "z900"); 739 break; 740 case 0x2084: 741 case 0x2086: 742 strcpy(elf_platform, "z990"); 743 break; 744 case 0x2094: 745 case 0x2096: 746 strcpy(elf_platform, "z9-109"); 747 break; 748 case 0x2097: 749 case 0x2098: 750 strcpy(elf_platform, "z10"); 751 break; 752 } 753 } 754 755 /* 756 * Setup function called from init/main.c just after the banner 757 * was printed. 758 */ 759 760 void __init 761 setup_arch(char **cmdline_p) 762 { 763 /* set up preferred console */ 764 add_preferred_console("ttyS", 0, NULL); 765 766 /* 767 * print what head.S has found out about the machine 768 */ 769 #ifndef CONFIG_64BIT 770 if (MACHINE_IS_VM) 771 pr_info("Linux is running as a z/VM " 772 "guest operating system in 31-bit mode\n"); 773 else 774 pr_info("Linux is running natively in 31-bit mode\n"); 775 if (MACHINE_HAS_IEEE) 776 pr_info("The hardware system has IEEE compatible " 777 "floating point units\n"); 778 else 779 pr_info("The hardware system has no IEEE compatible " 780 "floating point units\n"); 781 #else /* CONFIG_64BIT */ 782 if (MACHINE_IS_VM) 783 pr_info("Linux is running as a z/VM " 784 "guest operating system in 64-bit mode\n"); 785 else if (MACHINE_IS_KVM) { 786 pr_info("Linux is running under KVM in 64-bit mode\n"); 787 add_preferred_console("hvc", 0, NULL); 788 s390_virtio_console_init(); 789 } else 790 pr_info("Linux is running natively in 64-bit mode\n"); 791 #endif /* CONFIG_64BIT */ 792 793 /* Have one command line that is parsed and saved in /proc/cmdline */ 794 /* boot_command_line has been already set up in early.c */ 795 *cmdline_p = boot_command_line; 796 797 ROOT_DEV = Root_RAM0; 798 799 init_mm.start_code = PAGE_OFFSET; 800 init_mm.end_code = (unsigned long) &_etext; 801 init_mm.end_data = (unsigned long) &_edata; 802 init_mm.brk = (unsigned long) &_end; 803 804 if (MACHINE_HAS_MVCOS) 805 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 806 else 807 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 808 809 parse_early_param(); 810 811 setup_ipl(); 812 setup_memory_end(); 813 setup_addressing_mode(); 814 setup_memory(); 815 setup_resources(); 816 setup_lowcore(); 817 818 cpu_init(); 819 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 820 s390_init_cpu_topology(); 821 822 /* 823 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 824 */ 825 setup_hwcaps(); 826 827 /* 828 * Create kernel page tables and switch to virtual addressing. 829 */ 830 paging_init(); 831 832 /* Setup default console */ 833 conmode_default(); 834 835 /* Setup zfcpdump support */ 836 setup_zfcpdump(console_devno); 837 } 838