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 EXPORT_SYMBOL(console_mode); 78 79 unsigned int console_devno = -1; 80 EXPORT_SYMBOL(console_devno); 81 82 unsigned int console_irq = -1; 83 EXPORT_SYMBOL(console_irq); 84 85 unsigned long machine_flags; 86 EXPORT_SYMBOL(machine_flags); 87 88 unsigned long elf_hwcap = 0; 89 char elf_platform[ELF_PLATFORM_SIZE]; 90 91 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS]; 92 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ 93 94 int __initdata memory_end_set; 95 unsigned long __initdata memory_end; 96 97 /* An array with a pointer to the lowcore of every CPU. */ 98 struct _lowcore *lowcore_ptr[NR_CPUS]; 99 EXPORT_SYMBOL(lowcore_ptr); 100 101 /* 102 * This is set up by the setup-routine at boot-time 103 * for S390 need to find out, what we have to setup 104 * using address 0x10400 ... 105 */ 106 107 #include <asm/setup.h> 108 109 static struct resource code_resource = { 110 .name = "Kernel code", 111 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 112 }; 113 114 static struct resource data_resource = { 115 .name = "Kernel data", 116 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 117 }; 118 119 /* 120 * cpu_init() initializes state that is per-CPU. 121 */ 122 void __cpuinit cpu_init(void) 123 { 124 /* 125 * Store processor id in lowcore (used e.g. in timer_interrupt) 126 */ 127 get_cpu_id(&S390_lowcore.cpu_id); 128 129 /* 130 * Force FPU initialization: 131 */ 132 clear_thread_flag(TIF_USEDFPU); 133 clear_used_math(); 134 135 atomic_inc(&init_mm.mm_count); 136 current->active_mm = &init_mm; 137 BUG_ON(current->mm); 138 enter_lazy_tlb(&init_mm, current); 139 } 140 141 /* 142 * condev= and conmode= setup parameter. 143 */ 144 145 static int __init condev_setup(char *str) 146 { 147 int vdev; 148 149 vdev = simple_strtoul(str, &str, 0); 150 if (vdev >= 0 && vdev < 65536) { 151 console_devno = vdev; 152 console_irq = -1; 153 } 154 return 1; 155 } 156 157 __setup("condev=", condev_setup); 158 159 static int __init conmode_setup(char *str) 160 { 161 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 162 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 163 SET_CONSOLE_SCLP; 164 #endif 165 #if defined(CONFIG_TN3215_CONSOLE) 166 if (strncmp(str, "3215", 5) == 0) 167 SET_CONSOLE_3215; 168 #endif 169 #if defined(CONFIG_TN3270_CONSOLE) 170 if (strncmp(str, "3270", 5) == 0) 171 SET_CONSOLE_3270; 172 #endif 173 return 1; 174 } 175 176 __setup("conmode=", conmode_setup); 177 178 static void __init conmode_default(void) 179 { 180 char query_buffer[1024]; 181 char *ptr; 182 183 if (MACHINE_IS_VM) { 184 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 185 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 186 ptr = strstr(query_buffer, "SUBCHANNEL ="); 187 console_irq = simple_strtoul(ptr + 13, NULL, 16); 188 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 189 ptr = strstr(query_buffer, "CONMODE"); 190 /* 191 * Set the conmode to 3215 so that the device recognition 192 * will set the cu_type of the console to 3215. If the 193 * conmode is 3270 and we don't set it back then both 194 * 3215 and the 3270 driver will try to access the console 195 * device (3215 as console and 3270 as normal tty). 196 */ 197 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 198 if (ptr == NULL) { 199 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 200 SET_CONSOLE_SCLP; 201 #endif 202 return; 203 } 204 if (strncmp(ptr + 8, "3270", 4) == 0) { 205 #if defined(CONFIG_TN3270_CONSOLE) 206 SET_CONSOLE_3270; 207 #elif defined(CONFIG_TN3215_CONSOLE) 208 SET_CONSOLE_3215; 209 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 210 SET_CONSOLE_SCLP; 211 #endif 212 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 213 #if defined(CONFIG_TN3215_CONSOLE) 214 SET_CONSOLE_3215; 215 #elif defined(CONFIG_TN3270_CONSOLE) 216 SET_CONSOLE_3270; 217 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 218 SET_CONSOLE_SCLP; 219 #endif 220 } 221 } else { 222 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 223 SET_CONSOLE_SCLP; 224 #endif 225 } 226 } 227 228 #ifdef CONFIG_ZFCPDUMP 229 static void __init setup_zfcpdump(unsigned int console_devno) 230 { 231 static char str[41]; 232 233 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 234 return; 235 if (console_devno != -1) 236 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 237 ipl_info.data.fcp.dev_id.devno, console_devno); 238 else 239 sprintf(str, " cio_ignore=all,!0.0.%04x", 240 ipl_info.data.fcp.dev_id.devno); 241 strcat(boot_command_line, str); 242 console_loglevel = 2; 243 } 244 #else 245 static inline void setup_zfcpdump(unsigned int console_devno) {} 246 #endif /* CONFIG_ZFCPDUMP */ 247 248 /* 249 * Reboot, halt and power_off stubs. They just call _machine_restart, 250 * _machine_halt or _machine_power_off. 251 */ 252 253 void machine_restart(char *command) 254 { 255 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 256 /* 257 * Only unblank the console if we are called in enabled 258 * context or a bust_spinlocks cleared the way for us. 259 */ 260 console_unblank(); 261 _machine_restart(command); 262 } 263 264 void machine_halt(void) 265 { 266 if (!in_interrupt() || oops_in_progress) 267 /* 268 * Only unblank the console if we are called in enabled 269 * context or a bust_spinlocks cleared the way for us. 270 */ 271 console_unblank(); 272 _machine_halt(); 273 } 274 275 void machine_power_off(void) 276 { 277 if (!in_interrupt() || oops_in_progress) 278 /* 279 * Only unblank the console if we are called in enabled 280 * context or a bust_spinlocks cleared the way for us. 281 */ 282 console_unblank(); 283 _machine_power_off(); 284 } 285 286 /* 287 * Dummy power off function. 288 */ 289 void (*pm_power_off)(void) = machine_power_off; 290 291 static int __init early_parse_mem(char *p) 292 { 293 memory_end = memparse(p, &p); 294 memory_end_set = 1; 295 return 0; 296 } 297 early_param("mem", early_parse_mem); 298 299 #ifdef CONFIG_S390_SWITCH_AMODE 300 unsigned int switch_amode = 0; 301 EXPORT_SYMBOL_GPL(switch_amode); 302 303 static int set_amode_and_uaccess(unsigned long user_amode, 304 unsigned long user32_amode) 305 { 306 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 307 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 308 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 309 #ifdef CONFIG_COMPAT 310 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 311 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 312 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 313 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 314 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 315 PSW32_MASK_PSTATE; 316 #endif 317 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 318 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 319 320 if (MACHINE_HAS_MVCOS) { 321 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 322 return 1; 323 } else { 324 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 325 return 0; 326 } 327 } 328 329 /* 330 * Switch kernel/user addressing modes? 331 */ 332 static int __init early_parse_switch_amode(char *p) 333 { 334 switch_amode = 1; 335 return 0; 336 } 337 early_param("switch_amode", early_parse_switch_amode); 338 339 #else /* CONFIG_S390_SWITCH_AMODE */ 340 static inline int set_amode_and_uaccess(unsigned long user_amode, 341 unsigned long user32_amode) 342 { 343 return 0; 344 } 345 #endif /* CONFIG_S390_SWITCH_AMODE */ 346 347 #ifdef CONFIG_S390_EXEC_PROTECT 348 unsigned int s390_noexec = 0; 349 EXPORT_SYMBOL_GPL(s390_noexec); 350 351 /* 352 * Enable execute protection? 353 */ 354 static int __init early_parse_noexec(char *p) 355 { 356 if (!strncmp(p, "off", 3)) 357 return 0; 358 switch_amode = 1; 359 s390_noexec = 1; 360 return 0; 361 } 362 early_param("noexec", early_parse_noexec); 363 #endif /* CONFIG_S390_EXEC_PROTECT */ 364 365 static void setup_addressing_mode(void) 366 { 367 if (s390_noexec) { 368 if (set_amode_and_uaccess(PSW_ASC_SECONDARY, 369 PSW32_ASC_SECONDARY)) 370 pr_info("Execute protection active, " 371 "mvcos available\n"); 372 else 373 pr_info("Execute protection active, " 374 "mvcos not available\n"); 375 } else if (switch_amode) { 376 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY)) 377 pr_info("Address spaces switched, " 378 "mvcos available\n"); 379 else 380 pr_info("Address spaces switched, " 381 "mvcos not available\n"); 382 } 383 #ifdef CONFIG_TRACE_IRQFLAGS 384 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 385 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 386 #endif 387 } 388 389 static void __init 390 setup_lowcore(void) 391 { 392 struct _lowcore *lc; 393 int lc_pages; 394 395 /* 396 * Setup lowcore for boot cpu 397 */ 398 lc_pages = sizeof(void *) == 8 ? 2 : 1; 399 lc = (struct _lowcore *) 400 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 401 memset(lc, 0, lc_pages * PAGE_SIZE); 402 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 403 lc->restart_psw.addr = 404 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 405 if (switch_amode) 406 lc->restart_psw.mask |= PSW_ASC_HOME; 407 lc->external_new_psw.mask = psw_kernel_bits; 408 lc->external_new_psw.addr = 409 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 410 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 411 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 412 lc->program_new_psw.mask = psw_kernel_bits; 413 lc->program_new_psw.addr = 414 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 415 lc->mcck_new_psw.mask = 416 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 417 lc->mcck_new_psw.addr = 418 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 419 lc->io_new_psw.mask = psw_kernel_bits; 420 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 421 lc->clock_comparator = -1ULL; 422 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 423 lc->async_stack = (unsigned long) 424 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 425 lc->panic_stack = (unsigned long) 426 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 427 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 428 lc->thread_info = (unsigned long) &init_thread_union; 429 #ifndef CONFIG_64BIT 430 if (MACHINE_HAS_IEEE) { 431 lc->extended_save_area_addr = (__u32) 432 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 433 /* enable extended save area */ 434 __ctl_set_bit(14, 29); 435 } 436 #else 437 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 438 #endif 439 set_prefix((u32)(unsigned long) lc); 440 lowcore_ptr[0] = lc; 441 } 442 443 static void __init 444 setup_resources(void) 445 { 446 struct resource *res, *sub_res; 447 int i; 448 449 code_resource.start = (unsigned long) &_text; 450 code_resource.end = (unsigned long) &_etext - 1; 451 data_resource.start = (unsigned long) &_etext; 452 data_resource.end = (unsigned long) &_edata - 1; 453 454 for (i = 0; i < MEMORY_CHUNKS; i++) { 455 if (!memory_chunk[i].size) 456 continue; 457 res = alloc_bootmem_low(sizeof(struct resource)); 458 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 459 switch (memory_chunk[i].type) { 460 case CHUNK_READ_WRITE: 461 res->name = "System RAM"; 462 break; 463 case CHUNK_READ_ONLY: 464 res->name = "System ROM"; 465 res->flags |= IORESOURCE_READONLY; 466 break; 467 default: 468 res->name = "reserved"; 469 } 470 res->start = memory_chunk[i].addr; 471 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 472 request_resource(&iomem_resource, res); 473 474 if (code_resource.start >= res->start && 475 code_resource.start <= res->end && 476 code_resource.end > res->end) { 477 sub_res = alloc_bootmem_low(sizeof(struct resource)); 478 memcpy(sub_res, &code_resource, 479 sizeof(struct resource)); 480 sub_res->end = res->end; 481 code_resource.start = res->end + 1; 482 request_resource(res, sub_res); 483 } 484 485 if (code_resource.start >= res->start && 486 code_resource.start <= res->end && 487 code_resource.end <= res->end) 488 request_resource(res, &code_resource); 489 490 if (data_resource.start >= res->start && 491 data_resource.start <= res->end && 492 data_resource.end > res->end) { 493 sub_res = alloc_bootmem_low(sizeof(struct resource)); 494 memcpy(sub_res, &data_resource, 495 sizeof(struct resource)); 496 sub_res->end = res->end; 497 data_resource.start = res->end + 1; 498 request_resource(res, sub_res); 499 } 500 501 if (data_resource.start >= res->start && 502 data_resource.start <= res->end && 503 data_resource.end <= res->end) 504 request_resource(res, &data_resource); 505 } 506 } 507 508 unsigned long real_memory_size; 509 EXPORT_SYMBOL_GPL(real_memory_size); 510 511 static void __init setup_memory_end(void) 512 { 513 unsigned long memory_size; 514 unsigned long max_mem; 515 int i; 516 517 #ifdef CONFIG_ZFCPDUMP 518 if (ipl_info.type == IPL_TYPE_FCP_DUMP) { 519 memory_end = ZFCPDUMP_HSA_SIZE; 520 memory_end_set = 1; 521 } 522 #endif 523 memory_size = 0; 524 memory_end &= PAGE_MASK; 525 526 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 527 memory_end = min(max_mem, memory_end); 528 529 /* 530 * Make sure all chunks are MAX_ORDER aligned so we don't need the 531 * extra checks that HOLES_IN_ZONE would require. 532 */ 533 for (i = 0; i < MEMORY_CHUNKS; i++) { 534 unsigned long start, end; 535 struct mem_chunk *chunk; 536 unsigned long align; 537 538 chunk = &memory_chunk[i]; 539 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 540 start = (chunk->addr + align - 1) & ~(align - 1); 541 end = (chunk->addr + chunk->size) & ~(align - 1); 542 if (start >= end) 543 memset(chunk, 0, sizeof(*chunk)); 544 else { 545 chunk->addr = start; 546 chunk->size = end - start; 547 } 548 } 549 550 for (i = 0; i < MEMORY_CHUNKS; i++) { 551 struct mem_chunk *chunk = &memory_chunk[i]; 552 553 real_memory_size = max(real_memory_size, 554 chunk->addr + chunk->size); 555 if (chunk->addr >= max_mem) { 556 memset(chunk, 0, sizeof(*chunk)); 557 continue; 558 } 559 if (chunk->addr + chunk->size > max_mem) 560 chunk->size = max_mem - chunk->addr; 561 memory_size = max(memory_size, chunk->addr + chunk->size); 562 } 563 if (!memory_end) 564 memory_end = memory_size; 565 } 566 567 static void __init 568 setup_memory(void) 569 { 570 unsigned long bootmap_size; 571 unsigned long start_pfn, end_pfn; 572 int i; 573 574 /* 575 * partially used pages are not usable - thus 576 * we are rounding upwards: 577 */ 578 start_pfn = PFN_UP(__pa(&_end)); 579 end_pfn = max_pfn = PFN_DOWN(memory_end); 580 581 #ifdef CONFIG_BLK_DEV_INITRD 582 /* 583 * Move the initrd in case the bitmap of the bootmem allocater 584 * would overwrite it. 585 */ 586 587 if (INITRD_START && INITRD_SIZE) { 588 unsigned long bmap_size; 589 unsigned long start; 590 591 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 592 bmap_size = PFN_PHYS(bmap_size); 593 594 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 595 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 596 597 if (start + INITRD_SIZE > memory_end) { 598 pr_err("initrd extends beyond end of " 599 "memory (0x%08lx > 0x%08lx) " 600 "disabling initrd\n", 601 start + INITRD_SIZE, memory_end); 602 INITRD_START = INITRD_SIZE = 0; 603 } else { 604 pr_info("Moving initrd (0x%08lx -> " 605 "0x%08lx, size: %ld)\n", 606 INITRD_START, start, INITRD_SIZE); 607 memmove((void *) start, (void *) INITRD_START, 608 INITRD_SIZE); 609 INITRD_START = start; 610 } 611 } 612 } 613 #endif 614 615 /* 616 * Initialize the boot-time allocator 617 */ 618 bootmap_size = init_bootmem(start_pfn, end_pfn); 619 620 /* 621 * Register RAM areas with the bootmem allocator. 622 */ 623 624 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 625 unsigned long start_chunk, end_chunk, pfn; 626 627 if (memory_chunk[i].type != CHUNK_READ_WRITE) 628 continue; 629 start_chunk = PFN_DOWN(memory_chunk[i].addr); 630 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 631 end_chunk = min(end_chunk, end_pfn); 632 if (start_chunk >= end_chunk) 633 continue; 634 add_active_range(0, start_chunk, end_chunk); 635 pfn = max(start_chunk, start_pfn); 636 for (; pfn < end_chunk; pfn++) 637 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 638 } 639 640 psw_set_key(PAGE_DEFAULT_KEY); 641 642 free_bootmem_with_active_regions(0, max_pfn); 643 644 /* 645 * Reserve memory used for lowcore/command line/kernel image. 646 */ 647 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 648 reserve_bootmem((unsigned long)_stext, 649 PFN_PHYS(start_pfn) - (unsigned long)_stext, 650 BOOTMEM_DEFAULT); 651 /* 652 * Reserve the bootmem bitmap itself as well. We do this in two 653 * steps (first step was init_bootmem()) because this catches 654 * the (very unlikely) case of us accidentally initializing the 655 * bootmem allocator with an invalid RAM area. 656 */ 657 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 658 BOOTMEM_DEFAULT); 659 660 #ifdef CONFIG_BLK_DEV_INITRD 661 if (INITRD_START && INITRD_SIZE) { 662 if (INITRD_START + INITRD_SIZE <= memory_end) { 663 reserve_bootmem(INITRD_START, INITRD_SIZE, 664 BOOTMEM_DEFAULT); 665 initrd_start = INITRD_START; 666 initrd_end = initrd_start + INITRD_SIZE; 667 } else { 668 pr_err("initrd extends beyond end of " 669 "memory (0x%08lx > 0x%08lx) " 670 "disabling initrd\n", 671 initrd_start + INITRD_SIZE, memory_end); 672 initrd_start = initrd_end = 0; 673 } 674 } 675 #endif 676 } 677 678 /* 679 * Setup hardware capabilities. 680 */ 681 static void __init setup_hwcaps(void) 682 { 683 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 684 unsigned long long facility_list_extended; 685 unsigned int facility_list; 686 int i; 687 688 facility_list = stfl(); 689 /* 690 * The store facility list bits numbers as found in the principles 691 * of operation are numbered with bit 1UL<<31 as number 0 to 692 * bit 1UL<<0 as number 31. 693 * Bit 0: instructions named N3, "backported" to esa-mode 694 * Bit 2: z/Architecture mode is active 695 * Bit 7: the store-facility-list-extended facility is installed 696 * Bit 17: the message-security assist is installed 697 * Bit 19: the long-displacement facility is installed 698 * Bit 21: the extended-immediate facility is installed 699 * Bit 22: extended-translation facility 3 is installed 700 * Bit 30: extended-translation facility 3 enhancement facility 701 * These get translated to: 702 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 703 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 704 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 705 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 706 */ 707 for (i = 0; i < 6; i++) 708 if (facility_list & (1UL << (31 - stfl_bits[i]))) 709 elf_hwcap |= 1UL << i; 710 711 if ((facility_list & (1UL << (31 - 22))) 712 && (facility_list & (1UL << (31 - 30)))) 713 elf_hwcap |= 1UL << 8; 714 715 /* 716 * Check for additional facilities with store-facility-list-extended. 717 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 718 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 719 * as stored by stfl, bits 32-xxx contain additional facilities. 720 * How many facility words are stored depends on the number of 721 * doublewords passed to the instruction. The additional facilites 722 * are: 723 * Bit 42: decimal floating point facility is installed 724 * Bit 44: perform floating point operation facility is installed 725 * translated to: 726 * HWCAP_S390_DFP bit 6 (42 && 44). 727 */ 728 if ((elf_hwcap & (1UL << 2)) && 729 __stfle(&facility_list_extended, 1) > 0) { 730 if ((facility_list_extended & (1ULL << (63 - 42))) 731 && (facility_list_extended & (1ULL << (63 - 44)))) 732 elf_hwcap |= 1UL << 6; 733 } 734 735 if (MACHINE_HAS_HPAGE) 736 elf_hwcap |= 1UL << 7; 737 738 switch (S390_lowcore.cpu_id.machine) { 739 case 0x9672: 740 #if !defined(CONFIG_64BIT) 741 default: /* Use "g5" as default for 31 bit kernels. */ 742 #endif 743 strcpy(elf_platform, "g5"); 744 break; 745 case 0x2064: 746 case 0x2066: 747 #if defined(CONFIG_64BIT) 748 default: /* Use "z900" as default for 64 bit kernels. */ 749 #endif 750 strcpy(elf_platform, "z900"); 751 break; 752 case 0x2084: 753 case 0x2086: 754 strcpy(elf_platform, "z990"); 755 break; 756 case 0x2094: 757 case 0x2096: 758 strcpy(elf_platform, "z9-109"); 759 break; 760 case 0x2097: 761 case 0x2098: 762 strcpy(elf_platform, "z10"); 763 break; 764 } 765 } 766 767 /* 768 * Setup function called from init/main.c just after the banner 769 * was printed. 770 */ 771 772 void __init 773 setup_arch(char **cmdline_p) 774 { 775 /* set up preferred console */ 776 add_preferred_console("ttyS", 0, NULL); 777 778 /* 779 * print what head.S has found out about the machine 780 */ 781 #ifndef CONFIG_64BIT 782 if (MACHINE_IS_VM) 783 pr_info("Linux is running as a z/VM " 784 "guest operating system in 31-bit mode\n"); 785 else 786 pr_info("Linux is running natively in 31-bit mode\n"); 787 if (MACHINE_HAS_IEEE) 788 pr_info("The hardware system has IEEE compatible " 789 "floating point units\n"); 790 else 791 pr_info("The hardware system has no IEEE compatible " 792 "floating point units\n"); 793 #else /* CONFIG_64BIT */ 794 if (MACHINE_IS_VM) 795 pr_info("Linux is running as a z/VM " 796 "guest operating system in 64-bit mode\n"); 797 else if (MACHINE_IS_KVM) { 798 pr_info("Linux is running under KVM in 64-bit mode\n"); 799 add_preferred_console("hvc", 0, NULL); 800 s390_virtio_console_init(); 801 } else 802 pr_info("Linux is running natively in 64-bit mode\n"); 803 #endif /* CONFIG_64BIT */ 804 805 /* Have one command line that is parsed and saved in /proc/cmdline */ 806 /* boot_command_line has been already set up in early.c */ 807 *cmdline_p = boot_command_line; 808 809 ROOT_DEV = Root_RAM0; 810 811 init_mm.start_code = PAGE_OFFSET; 812 init_mm.end_code = (unsigned long) &_etext; 813 init_mm.end_data = (unsigned long) &_edata; 814 init_mm.brk = (unsigned long) &_end; 815 816 if (MACHINE_HAS_MVCOS) 817 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 818 else 819 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 820 821 parse_early_param(); 822 823 setup_ipl(); 824 setup_memory_end(); 825 setup_addressing_mode(); 826 setup_memory(); 827 setup_resources(); 828 setup_lowcore(); 829 830 cpu_init(); 831 __cpu_logical_map[0] = stap(); 832 s390_init_cpu_topology(); 833 834 /* 835 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 836 */ 837 setup_hwcaps(); 838 839 /* 840 * Create kernel page tables and switch to virtual addressing. 841 */ 842 paging_init(); 843 844 /* Setup default console */ 845 conmode_default(); 846 847 /* Setup zfcpdump support */ 848 setup_zfcpdump(console_devno); 849 } 850