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 elf_hwcap = 0; 86 char elf_platform[ELF_PLATFORM_SIZE]; 87 88 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS]; 89 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ 90 91 int __initdata memory_end_set; 92 unsigned long __initdata memory_end; 93 94 /* An array with a pointer to the lowcore of every CPU. */ 95 struct _lowcore *lowcore_ptr[NR_CPUS]; 96 EXPORT_SYMBOL(lowcore_ptr); 97 98 /* 99 * This is set up by the setup-routine at boot-time 100 * for S390 need to find out, what we have to setup 101 * using address 0x10400 ... 102 */ 103 104 #include <asm/setup.h> 105 106 static struct resource code_resource = { 107 .name = "Kernel code", 108 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 109 }; 110 111 static struct resource data_resource = { 112 .name = "Kernel data", 113 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 114 }; 115 116 /* 117 * cpu_init() initializes state that is per-CPU. 118 */ 119 void __cpuinit cpu_init(void) 120 { 121 /* 122 * Store processor id in lowcore (used e.g. in timer_interrupt) 123 */ 124 get_cpu_id(&S390_lowcore.cpu_id); 125 126 /* 127 * Force FPU initialization: 128 */ 129 clear_thread_flag(TIF_USEDFPU); 130 clear_used_math(); 131 132 atomic_inc(&init_mm.mm_count); 133 current->active_mm = &init_mm; 134 BUG_ON(current->mm); 135 enter_lazy_tlb(&init_mm, current); 136 } 137 138 /* 139 * condev= and conmode= setup parameter. 140 */ 141 142 static int __init condev_setup(char *str) 143 { 144 int vdev; 145 146 vdev = simple_strtoul(str, &str, 0); 147 if (vdev >= 0 && vdev < 65536) { 148 console_devno = vdev; 149 console_irq = -1; 150 } 151 return 1; 152 } 153 154 __setup("condev=", condev_setup); 155 156 static int __init conmode_setup(char *str) 157 { 158 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 159 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 160 SET_CONSOLE_SCLP; 161 #endif 162 #if defined(CONFIG_TN3215_CONSOLE) 163 if (strncmp(str, "3215", 5) == 0) 164 SET_CONSOLE_3215; 165 #endif 166 #if defined(CONFIG_TN3270_CONSOLE) 167 if (strncmp(str, "3270", 5) == 0) 168 SET_CONSOLE_3270; 169 #endif 170 return 1; 171 } 172 173 __setup("conmode=", conmode_setup); 174 175 static void __init conmode_default(void) 176 { 177 char query_buffer[1024]; 178 char *ptr; 179 180 if (MACHINE_IS_VM) { 181 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 182 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 183 ptr = strstr(query_buffer, "SUBCHANNEL ="); 184 console_irq = simple_strtoul(ptr + 13, NULL, 16); 185 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 186 ptr = strstr(query_buffer, "CONMODE"); 187 /* 188 * Set the conmode to 3215 so that the device recognition 189 * will set the cu_type of the console to 3215. If the 190 * conmode is 3270 and we don't set it back then both 191 * 3215 and the 3270 driver will try to access the console 192 * device (3215 as console and 3270 as normal tty). 193 */ 194 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 195 if (ptr == NULL) { 196 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 197 SET_CONSOLE_SCLP; 198 #endif 199 return; 200 } 201 if (strncmp(ptr + 8, "3270", 4) == 0) { 202 #if defined(CONFIG_TN3270_CONSOLE) 203 SET_CONSOLE_3270; 204 #elif defined(CONFIG_TN3215_CONSOLE) 205 SET_CONSOLE_3215; 206 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 207 SET_CONSOLE_SCLP; 208 #endif 209 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 210 #if defined(CONFIG_TN3215_CONSOLE) 211 SET_CONSOLE_3215; 212 #elif defined(CONFIG_TN3270_CONSOLE) 213 SET_CONSOLE_3270; 214 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 215 SET_CONSOLE_SCLP; 216 #endif 217 } 218 } else { 219 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 220 SET_CONSOLE_SCLP; 221 #endif 222 } 223 } 224 225 #ifdef CONFIG_ZFCPDUMP 226 static void __init setup_zfcpdump(unsigned int console_devno) 227 { 228 static char str[41]; 229 230 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 231 return; 232 if (console_devno != -1) 233 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 234 ipl_info.data.fcp.dev_id.devno, console_devno); 235 else 236 sprintf(str, " cio_ignore=all,!0.0.%04x", 237 ipl_info.data.fcp.dev_id.devno); 238 strcat(boot_command_line, str); 239 console_loglevel = 2; 240 } 241 #else 242 static inline void setup_zfcpdump(unsigned int console_devno) {} 243 #endif /* CONFIG_ZFCPDUMP */ 244 245 /* 246 * Reboot, halt and power_off stubs. They just call _machine_restart, 247 * _machine_halt or _machine_power_off. 248 */ 249 250 void machine_restart(char *command) 251 { 252 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 253 /* 254 * Only unblank the console if we are called in enabled 255 * context or a bust_spinlocks cleared the way for us. 256 */ 257 console_unblank(); 258 _machine_restart(command); 259 } 260 261 void machine_halt(void) 262 { 263 if (!in_interrupt() || oops_in_progress) 264 /* 265 * Only unblank the console if we are called in enabled 266 * context or a bust_spinlocks cleared the way for us. 267 */ 268 console_unblank(); 269 _machine_halt(); 270 } 271 272 void machine_power_off(void) 273 { 274 if (!in_interrupt() || oops_in_progress) 275 /* 276 * Only unblank the console if we are called in enabled 277 * context or a bust_spinlocks cleared the way for us. 278 */ 279 console_unblank(); 280 _machine_power_off(); 281 } 282 283 /* 284 * Dummy power off function. 285 */ 286 void (*pm_power_off)(void) = machine_power_off; 287 288 static int __init early_parse_mem(char *p) 289 { 290 memory_end = memparse(p, &p); 291 memory_end_set = 1; 292 return 0; 293 } 294 early_param("mem", early_parse_mem); 295 296 #ifdef CONFIG_S390_SWITCH_AMODE 297 unsigned int switch_amode = 0; 298 EXPORT_SYMBOL_GPL(switch_amode); 299 300 static int set_amode_and_uaccess(unsigned long user_amode, 301 unsigned long user32_amode) 302 { 303 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 304 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 305 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 306 #ifdef CONFIG_COMPAT 307 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 308 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 309 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 310 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 311 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 312 PSW32_MASK_PSTATE; 313 #endif 314 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 315 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 316 317 if (MACHINE_HAS_MVCOS) { 318 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 319 return 1; 320 } else { 321 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 322 return 0; 323 } 324 } 325 326 /* 327 * Switch kernel/user addressing modes? 328 */ 329 static int __init early_parse_switch_amode(char *p) 330 { 331 switch_amode = 1; 332 return 0; 333 } 334 early_param("switch_amode", early_parse_switch_amode); 335 336 #else /* CONFIG_S390_SWITCH_AMODE */ 337 static inline int set_amode_and_uaccess(unsigned long user_amode, 338 unsigned long user32_amode) 339 { 340 return 0; 341 } 342 #endif /* CONFIG_S390_SWITCH_AMODE */ 343 344 #ifdef CONFIG_S390_EXEC_PROTECT 345 unsigned int s390_noexec = 0; 346 EXPORT_SYMBOL_GPL(s390_noexec); 347 348 /* 349 * Enable execute protection? 350 */ 351 static int __init early_parse_noexec(char *p) 352 { 353 if (!strncmp(p, "off", 3)) 354 return 0; 355 switch_amode = 1; 356 s390_noexec = 1; 357 return 0; 358 } 359 early_param("noexec", early_parse_noexec); 360 #endif /* CONFIG_S390_EXEC_PROTECT */ 361 362 static void setup_addressing_mode(void) 363 { 364 if (s390_noexec) { 365 if (set_amode_and_uaccess(PSW_ASC_SECONDARY, 366 PSW32_ASC_SECONDARY)) 367 pr_info("Execute protection active, " 368 "mvcos available\n"); 369 else 370 pr_info("Execute protection active, " 371 "mvcos not available\n"); 372 } else if (switch_amode) { 373 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY)) 374 pr_info("Address spaces switched, " 375 "mvcos available\n"); 376 else 377 pr_info("Address spaces switched, " 378 "mvcos not available\n"); 379 } 380 #ifdef CONFIG_TRACE_IRQFLAGS 381 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 382 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 383 #endif 384 } 385 386 static void __init 387 setup_lowcore(void) 388 { 389 struct _lowcore *lc; 390 int lc_pages; 391 392 /* 393 * Setup lowcore for boot cpu 394 */ 395 lc_pages = sizeof(void *) == 8 ? 2 : 1; 396 lc = (struct _lowcore *) 397 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 398 memset(lc, 0, lc_pages * PAGE_SIZE); 399 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 400 lc->restart_psw.addr = 401 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 402 if (switch_amode) 403 lc->restart_psw.mask |= PSW_ASC_HOME; 404 lc->external_new_psw.mask = psw_kernel_bits; 405 lc->external_new_psw.addr = 406 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 407 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 408 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 409 lc->program_new_psw.mask = psw_kernel_bits; 410 lc->program_new_psw.addr = 411 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 412 lc->mcck_new_psw.mask = 413 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 414 lc->mcck_new_psw.addr = 415 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 416 lc->io_new_psw.mask = psw_kernel_bits; 417 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 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 lc->machine_flags = S390_lowcore.machine_flags; 427 #ifndef CONFIG_64BIT 428 if (MACHINE_HAS_IEEE) { 429 lc->extended_save_area_addr = (__u32) 430 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 431 /* enable extended save area */ 432 __ctl_set_bit(14, 29); 433 } 434 #else 435 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 436 #endif 437 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 438 lc->async_enter_timer = S390_lowcore.async_enter_timer; 439 lc->exit_timer = S390_lowcore.exit_timer; 440 lc->user_timer = S390_lowcore.user_timer; 441 lc->system_timer = S390_lowcore.system_timer; 442 lc->steal_timer = S390_lowcore.steal_timer; 443 lc->last_update_timer = S390_lowcore.last_update_timer; 444 lc->last_update_clock = S390_lowcore.last_update_clock; 445 set_prefix((u32)(unsigned long) lc); 446 lowcore_ptr[0] = lc; 447 } 448 449 static void __init 450 setup_resources(void) 451 { 452 struct resource *res, *sub_res; 453 int i; 454 455 code_resource.start = (unsigned long) &_text; 456 code_resource.end = (unsigned long) &_etext - 1; 457 data_resource.start = (unsigned long) &_etext; 458 data_resource.end = (unsigned long) &_edata - 1; 459 460 for (i = 0; i < MEMORY_CHUNKS; i++) { 461 if (!memory_chunk[i].size) 462 continue; 463 res = alloc_bootmem_low(sizeof(struct resource)); 464 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 465 switch (memory_chunk[i].type) { 466 case CHUNK_READ_WRITE: 467 res->name = "System RAM"; 468 break; 469 case CHUNK_READ_ONLY: 470 res->name = "System ROM"; 471 res->flags |= IORESOURCE_READONLY; 472 break; 473 default: 474 res->name = "reserved"; 475 } 476 res->start = memory_chunk[i].addr; 477 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 478 request_resource(&iomem_resource, res); 479 480 if (code_resource.start >= res->start && 481 code_resource.start <= res->end && 482 code_resource.end > res->end) { 483 sub_res = alloc_bootmem_low(sizeof(struct resource)); 484 memcpy(sub_res, &code_resource, 485 sizeof(struct resource)); 486 sub_res->end = res->end; 487 code_resource.start = res->end + 1; 488 request_resource(res, sub_res); 489 } 490 491 if (code_resource.start >= res->start && 492 code_resource.start <= res->end && 493 code_resource.end <= res->end) 494 request_resource(res, &code_resource); 495 496 if (data_resource.start >= res->start && 497 data_resource.start <= res->end && 498 data_resource.end > res->end) { 499 sub_res = alloc_bootmem_low(sizeof(struct resource)); 500 memcpy(sub_res, &data_resource, 501 sizeof(struct resource)); 502 sub_res->end = res->end; 503 data_resource.start = res->end + 1; 504 request_resource(res, sub_res); 505 } 506 507 if (data_resource.start >= res->start && 508 data_resource.start <= res->end && 509 data_resource.end <= res->end) 510 request_resource(res, &data_resource); 511 } 512 } 513 514 unsigned long real_memory_size; 515 EXPORT_SYMBOL_GPL(real_memory_size); 516 517 static void __init setup_memory_end(void) 518 { 519 unsigned long memory_size; 520 unsigned long max_mem; 521 int i; 522 523 #ifdef CONFIG_ZFCPDUMP 524 if (ipl_info.type == IPL_TYPE_FCP_DUMP) { 525 memory_end = ZFCPDUMP_HSA_SIZE; 526 memory_end_set = 1; 527 } 528 #endif 529 memory_size = 0; 530 memory_end &= PAGE_MASK; 531 532 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 533 memory_end = min(max_mem, memory_end); 534 535 /* 536 * Make sure all chunks are MAX_ORDER aligned so we don't need the 537 * extra checks that HOLES_IN_ZONE would require. 538 */ 539 for (i = 0; i < MEMORY_CHUNKS; i++) { 540 unsigned long start, end; 541 struct mem_chunk *chunk; 542 unsigned long align; 543 544 chunk = &memory_chunk[i]; 545 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 546 start = (chunk->addr + align - 1) & ~(align - 1); 547 end = (chunk->addr + chunk->size) & ~(align - 1); 548 if (start >= end) 549 memset(chunk, 0, sizeof(*chunk)); 550 else { 551 chunk->addr = start; 552 chunk->size = end - start; 553 } 554 } 555 556 for (i = 0; i < MEMORY_CHUNKS; i++) { 557 struct mem_chunk *chunk = &memory_chunk[i]; 558 559 real_memory_size = max(real_memory_size, 560 chunk->addr + chunk->size); 561 if (chunk->addr >= max_mem) { 562 memset(chunk, 0, sizeof(*chunk)); 563 continue; 564 } 565 if (chunk->addr + chunk->size > max_mem) 566 chunk->size = max_mem - chunk->addr; 567 memory_size = max(memory_size, chunk->addr + chunk->size); 568 } 569 if (!memory_end) 570 memory_end = memory_size; 571 } 572 573 static void __init 574 setup_memory(void) 575 { 576 unsigned long bootmap_size; 577 unsigned long start_pfn, end_pfn; 578 int i; 579 580 /* 581 * partially used pages are not usable - thus 582 * we are rounding upwards: 583 */ 584 start_pfn = PFN_UP(__pa(&_end)); 585 end_pfn = max_pfn = PFN_DOWN(memory_end); 586 587 #ifdef CONFIG_BLK_DEV_INITRD 588 /* 589 * Move the initrd in case the bitmap of the bootmem allocater 590 * would overwrite it. 591 */ 592 593 if (INITRD_START && INITRD_SIZE) { 594 unsigned long bmap_size; 595 unsigned long start; 596 597 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 598 bmap_size = PFN_PHYS(bmap_size); 599 600 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 601 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 602 603 if (start + INITRD_SIZE > memory_end) { 604 pr_err("initrd extends beyond end of " 605 "memory (0x%08lx > 0x%08lx) " 606 "disabling initrd\n", 607 start + INITRD_SIZE, memory_end); 608 INITRD_START = INITRD_SIZE = 0; 609 } else { 610 pr_info("Moving initrd (0x%08lx -> " 611 "0x%08lx, size: %ld)\n", 612 INITRD_START, start, INITRD_SIZE); 613 memmove((void *) start, (void *) INITRD_START, 614 INITRD_SIZE); 615 INITRD_START = start; 616 } 617 } 618 } 619 #endif 620 621 /* 622 * Initialize the boot-time allocator 623 */ 624 bootmap_size = init_bootmem(start_pfn, end_pfn); 625 626 /* 627 * Register RAM areas with the bootmem allocator. 628 */ 629 630 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 631 unsigned long start_chunk, end_chunk, pfn; 632 633 if (memory_chunk[i].type != CHUNK_READ_WRITE) 634 continue; 635 start_chunk = PFN_DOWN(memory_chunk[i].addr); 636 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 637 end_chunk = min(end_chunk, end_pfn); 638 if (start_chunk >= end_chunk) 639 continue; 640 add_active_range(0, start_chunk, end_chunk); 641 pfn = max(start_chunk, start_pfn); 642 for (; pfn < end_chunk; pfn++) 643 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 644 } 645 646 psw_set_key(PAGE_DEFAULT_KEY); 647 648 free_bootmem_with_active_regions(0, max_pfn); 649 650 /* 651 * Reserve memory used for lowcore/command line/kernel image. 652 */ 653 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 654 reserve_bootmem((unsigned long)_stext, 655 PFN_PHYS(start_pfn) - (unsigned long)_stext, 656 BOOTMEM_DEFAULT); 657 /* 658 * Reserve the bootmem bitmap itself as well. We do this in two 659 * steps (first step was init_bootmem()) because this catches 660 * the (very unlikely) case of us accidentally initializing the 661 * bootmem allocator with an invalid RAM area. 662 */ 663 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 664 BOOTMEM_DEFAULT); 665 666 #ifdef CONFIG_BLK_DEV_INITRD 667 if (INITRD_START && INITRD_SIZE) { 668 if (INITRD_START + INITRD_SIZE <= memory_end) { 669 reserve_bootmem(INITRD_START, INITRD_SIZE, 670 BOOTMEM_DEFAULT); 671 initrd_start = INITRD_START; 672 initrd_end = initrd_start + INITRD_SIZE; 673 } else { 674 pr_err("initrd extends beyond end of " 675 "memory (0x%08lx > 0x%08lx) " 676 "disabling initrd\n", 677 initrd_start + INITRD_SIZE, memory_end); 678 initrd_start = initrd_end = 0; 679 } 680 } 681 #endif 682 } 683 684 /* 685 * Setup hardware capabilities. 686 */ 687 static void __init setup_hwcaps(void) 688 { 689 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 690 unsigned long long facility_list_extended; 691 unsigned int facility_list; 692 int i; 693 694 facility_list = stfl(); 695 /* 696 * The store facility list bits numbers as found in the principles 697 * of operation are numbered with bit 1UL<<31 as number 0 to 698 * bit 1UL<<0 as number 31. 699 * Bit 0: instructions named N3, "backported" to esa-mode 700 * Bit 2: z/Architecture mode is active 701 * Bit 7: the store-facility-list-extended facility is installed 702 * Bit 17: the message-security assist is installed 703 * Bit 19: the long-displacement facility is installed 704 * Bit 21: the extended-immediate facility is installed 705 * Bit 22: extended-translation facility 3 is installed 706 * Bit 30: extended-translation facility 3 enhancement facility 707 * These get translated to: 708 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 709 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 710 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 711 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 712 */ 713 for (i = 0; i < 6; i++) 714 if (facility_list & (1UL << (31 - stfl_bits[i]))) 715 elf_hwcap |= 1UL << i; 716 717 if ((facility_list & (1UL << (31 - 22))) 718 && (facility_list & (1UL << (31 - 30)))) 719 elf_hwcap |= 1UL << 8; 720 721 /* 722 * Check for additional facilities with store-facility-list-extended. 723 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 724 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 725 * as stored by stfl, bits 32-xxx contain additional facilities. 726 * How many facility words are stored depends on the number of 727 * doublewords passed to the instruction. The additional facilites 728 * are: 729 * Bit 42: decimal floating point facility is installed 730 * Bit 44: perform floating point operation facility is installed 731 * translated to: 732 * HWCAP_S390_DFP bit 6 (42 && 44). 733 */ 734 if ((elf_hwcap & (1UL << 2)) && 735 __stfle(&facility_list_extended, 1) > 0) { 736 if ((facility_list_extended & (1ULL << (63 - 42))) 737 && (facility_list_extended & (1ULL << (63 - 44)))) 738 elf_hwcap |= 1UL << 6; 739 } 740 741 if (MACHINE_HAS_HPAGE) 742 elf_hwcap |= 1UL << 7; 743 744 switch (S390_lowcore.cpu_id.machine) { 745 case 0x9672: 746 #if !defined(CONFIG_64BIT) 747 default: /* Use "g5" as default for 31 bit kernels. */ 748 #endif 749 strcpy(elf_platform, "g5"); 750 break; 751 case 0x2064: 752 case 0x2066: 753 #if defined(CONFIG_64BIT) 754 default: /* Use "z900" as default for 64 bit kernels. */ 755 #endif 756 strcpy(elf_platform, "z900"); 757 break; 758 case 0x2084: 759 case 0x2086: 760 strcpy(elf_platform, "z990"); 761 break; 762 case 0x2094: 763 case 0x2096: 764 strcpy(elf_platform, "z9-109"); 765 break; 766 case 0x2097: 767 case 0x2098: 768 strcpy(elf_platform, "z10"); 769 break; 770 } 771 } 772 773 /* 774 * Setup function called from init/main.c just after the banner 775 * was printed. 776 */ 777 778 void __init 779 setup_arch(char **cmdline_p) 780 { 781 /* set up preferred console */ 782 add_preferred_console("ttyS", 0, NULL); 783 784 /* 785 * print what head.S has found out about the machine 786 */ 787 #ifndef CONFIG_64BIT 788 if (MACHINE_IS_VM) 789 pr_info("Linux is running as a z/VM " 790 "guest operating system in 31-bit mode\n"); 791 else 792 pr_info("Linux is running natively in 31-bit mode\n"); 793 if (MACHINE_HAS_IEEE) 794 pr_info("The hardware system has IEEE compatible " 795 "floating point units\n"); 796 else 797 pr_info("The hardware system has no IEEE compatible " 798 "floating point units\n"); 799 #else /* CONFIG_64BIT */ 800 if (MACHINE_IS_VM) 801 pr_info("Linux is running as a z/VM " 802 "guest operating system in 64-bit mode\n"); 803 else if (MACHINE_IS_KVM) { 804 pr_info("Linux is running under KVM in 64-bit mode\n"); 805 add_preferred_console("hvc", 0, NULL); 806 s390_virtio_console_init(); 807 } else 808 pr_info("Linux is running natively in 64-bit mode\n"); 809 #endif /* CONFIG_64BIT */ 810 811 /* Have one command line that is parsed and saved in /proc/cmdline */ 812 /* boot_command_line has been already set up in early.c */ 813 *cmdline_p = boot_command_line; 814 815 ROOT_DEV = Root_RAM0; 816 817 init_mm.start_code = PAGE_OFFSET; 818 init_mm.end_code = (unsigned long) &_etext; 819 init_mm.end_data = (unsigned long) &_edata; 820 init_mm.brk = (unsigned long) &_end; 821 822 if (MACHINE_HAS_MVCOS) 823 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 824 else 825 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 826 827 parse_early_param(); 828 829 setup_ipl(); 830 setup_memory_end(); 831 setup_addressing_mode(); 832 setup_memory(); 833 setup_resources(); 834 setup_lowcore(); 835 836 cpu_init(); 837 __cpu_logical_map[0] = stap(); 838 s390_init_cpu_topology(); 839 840 /* 841 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 842 */ 843 setup_hwcaps(); 844 845 /* 846 * Create kernel page tables and switch to virtual addressing. 847 */ 848 paging_init(); 849 850 /* Setup default console */ 851 conmode_default(); 852 853 /* Setup zfcpdump support */ 854 setup_zfcpdump(console_devno); 855 } 856