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 #include <linux/ftrace.h> 46 47 #include <asm/ipl.h> 48 #include <asm/uaccess.h> 49 #include <asm/system.h> 50 #include <asm/smp.h> 51 #include <asm/mmu_context.h> 52 #include <asm/cpcmd.h> 53 #include <asm/lowcore.h> 54 #include <asm/irq.h> 55 #include <asm/page.h> 56 #include <asm/ptrace.h> 57 #include <asm/sections.h> 58 #include <asm/ebcdic.h> 59 #include <asm/compat.h> 60 #include <asm/kvm_virtio.h> 61 62 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY | 63 PSW_MASK_MCHECK | PSW_DEFAULT_KEY); 64 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 65 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 66 PSW_MASK_PSTATE | PSW_DEFAULT_KEY); 67 68 /* 69 * User copy operations. 70 */ 71 struct uaccess_ops uaccess; 72 EXPORT_SYMBOL(uaccess); 73 74 /* 75 * Machine setup.. 76 */ 77 unsigned int console_mode = 0; 78 EXPORT_SYMBOL(console_mode); 79 80 unsigned int console_devno = -1; 81 EXPORT_SYMBOL(console_devno); 82 83 unsigned int console_irq = -1; 84 EXPORT_SYMBOL(console_irq); 85 86 unsigned long elf_hwcap = 0; 87 char elf_platform[ELF_PLATFORM_SIZE]; 88 89 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS]; 90 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ 91 92 int __initdata memory_end_set; 93 unsigned long __initdata memory_end; 94 95 /* An array with a pointer to the lowcore of every CPU. */ 96 struct _lowcore *lowcore_ptr[NR_CPUS]; 97 EXPORT_SYMBOL(lowcore_ptr); 98 99 /* 100 * This is set up by the setup-routine at boot-time 101 * for S390 need to find out, what we have to setup 102 * using address 0x10400 ... 103 */ 104 105 #include <asm/setup.h> 106 107 static struct resource code_resource = { 108 .name = "Kernel code", 109 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 110 }; 111 112 static struct resource data_resource = { 113 .name = "Kernel data", 114 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 115 }; 116 117 /* 118 * cpu_init() initializes state that is per-CPU. 119 */ 120 void __cpuinit cpu_init(void) 121 { 122 /* 123 * Store processor id in lowcore (used e.g. in timer_interrupt) 124 */ 125 get_cpu_id(&S390_lowcore.cpu_id); 126 127 /* 128 * Force FPU initialization: 129 */ 130 clear_thread_flag(TIF_USEDFPU); 131 clear_used_math(); 132 133 atomic_inc(&init_mm.mm_count); 134 current->active_mm = &init_mm; 135 BUG_ON(current->mm); 136 enter_lazy_tlb(&init_mm, current); 137 } 138 139 /* 140 * condev= and conmode= setup parameter. 141 */ 142 143 static int __init condev_setup(char *str) 144 { 145 int vdev; 146 147 vdev = simple_strtoul(str, &str, 0); 148 if (vdev >= 0 && vdev < 65536) { 149 console_devno = vdev; 150 console_irq = -1; 151 } 152 return 1; 153 } 154 155 __setup("condev=", condev_setup); 156 157 static int __init conmode_setup(char *str) 158 { 159 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 160 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 161 SET_CONSOLE_SCLP; 162 #endif 163 #if defined(CONFIG_TN3215_CONSOLE) 164 if (strncmp(str, "3215", 5) == 0) 165 SET_CONSOLE_3215; 166 #endif 167 #if defined(CONFIG_TN3270_CONSOLE) 168 if (strncmp(str, "3270", 5) == 0) 169 SET_CONSOLE_3270; 170 #endif 171 return 1; 172 } 173 174 __setup("conmode=", conmode_setup); 175 176 static void __init conmode_default(void) 177 { 178 char query_buffer[1024]; 179 char *ptr; 180 181 if (MACHINE_IS_VM) { 182 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 183 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 184 ptr = strstr(query_buffer, "SUBCHANNEL ="); 185 console_irq = simple_strtoul(ptr + 13, NULL, 16); 186 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 187 ptr = strstr(query_buffer, "CONMODE"); 188 /* 189 * Set the conmode to 3215 so that the device recognition 190 * will set the cu_type of the console to 3215. If the 191 * conmode is 3270 and we don't set it back then both 192 * 3215 and the 3270 driver will try to access the console 193 * device (3215 as console and 3270 as normal tty). 194 */ 195 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 196 if (ptr == NULL) { 197 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 198 SET_CONSOLE_SCLP; 199 #endif 200 return; 201 } 202 if (strncmp(ptr + 8, "3270", 4) == 0) { 203 #if defined(CONFIG_TN3270_CONSOLE) 204 SET_CONSOLE_3270; 205 #elif defined(CONFIG_TN3215_CONSOLE) 206 SET_CONSOLE_3215; 207 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 208 SET_CONSOLE_SCLP; 209 #endif 210 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 211 #if defined(CONFIG_TN3215_CONSOLE) 212 SET_CONSOLE_3215; 213 #elif defined(CONFIG_TN3270_CONSOLE) 214 SET_CONSOLE_3270; 215 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 216 SET_CONSOLE_SCLP; 217 #endif 218 } 219 } else { 220 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 221 SET_CONSOLE_SCLP; 222 #endif 223 } 224 } 225 226 #ifdef CONFIG_ZFCPDUMP 227 static void __init setup_zfcpdump(unsigned int console_devno) 228 { 229 static char str[41]; 230 231 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 232 return; 233 if (console_devno != -1) 234 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 235 ipl_info.data.fcp.dev_id.devno, console_devno); 236 else 237 sprintf(str, " cio_ignore=all,!0.0.%04x", 238 ipl_info.data.fcp.dev_id.devno); 239 strcat(boot_command_line, str); 240 console_loglevel = 2; 241 } 242 #else 243 static inline void setup_zfcpdump(unsigned int console_devno) {} 244 #endif /* CONFIG_ZFCPDUMP */ 245 246 /* 247 * Reboot, halt and power_off stubs. They just call _machine_restart, 248 * _machine_halt or _machine_power_off. 249 */ 250 251 void machine_restart(char *command) 252 { 253 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 254 /* 255 * Only unblank the console if we are called in enabled 256 * context or a bust_spinlocks cleared the way for us. 257 */ 258 console_unblank(); 259 _machine_restart(command); 260 } 261 262 void machine_halt(void) 263 { 264 if (!in_interrupt() || oops_in_progress) 265 /* 266 * Only unblank the console if we are called in enabled 267 * context or a bust_spinlocks cleared the way for us. 268 */ 269 console_unblank(); 270 _machine_halt(); 271 } 272 273 void machine_power_off(void) 274 { 275 if (!in_interrupt() || oops_in_progress) 276 /* 277 * Only unblank the console if we are called in enabled 278 * context or a bust_spinlocks cleared the way for us. 279 */ 280 console_unblank(); 281 _machine_power_off(); 282 } 283 284 /* 285 * Dummy power off function. 286 */ 287 void (*pm_power_off)(void) = machine_power_off; 288 289 static int __init early_parse_mem(char *p) 290 { 291 memory_end = memparse(p, &p); 292 memory_end_set = 1; 293 return 0; 294 } 295 early_param("mem", early_parse_mem); 296 297 #ifdef CONFIG_S390_SWITCH_AMODE 298 unsigned int switch_amode = 0; 299 EXPORT_SYMBOL_GPL(switch_amode); 300 301 static int set_amode_and_uaccess(unsigned long user_amode, 302 unsigned long user32_amode) 303 { 304 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 305 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 306 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 307 #ifdef CONFIG_COMPAT 308 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 309 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 310 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 311 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 312 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 313 PSW32_MASK_PSTATE; 314 #endif 315 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 316 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 317 318 if (MACHINE_HAS_MVCOS) { 319 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 320 return 1; 321 } else { 322 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 323 return 0; 324 } 325 } 326 327 /* 328 * Switch kernel/user addressing modes? 329 */ 330 static int __init early_parse_switch_amode(char *p) 331 { 332 switch_amode = 1; 333 return 0; 334 } 335 early_param("switch_amode", early_parse_switch_amode); 336 337 #else /* CONFIG_S390_SWITCH_AMODE */ 338 static inline int set_amode_and_uaccess(unsigned long user_amode, 339 unsigned long user32_amode) 340 { 341 return 0; 342 } 343 #endif /* CONFIG_S390_SWITCH_AMODE */ 344 345 #ifdef CONFIG_S390_EXEC_PROTECT 346 unsigned int s390_noexec = 0; 347 EXPORT_SYMBOL_GPL(s390_noexec); 348 349 /* 350 * Enable execute protection? 351 */ 352 static int __init early_parse_noexec(char *p) 353 { 354 if (!strncmp(p, "off", 3)) 355 return 0; 356 switch_amode = 1; 357 s390_noexec = 1; 358 return 0; 359 } 360 early_param("noexec", early_parse_noexec); 361 #endif /* CONFIG_S390_EXEC_PROTECT */ 362 363 static void setup_addressing_mode(void) 364 { 365 if (s390_noexec) { 366 if (set_amode_and_uaccess(PSW_ASC_SECONDARY, 367 PSW32_ASC_SECONDARY)) 368 pr_info("Execute protection active, " 369 "mvcos available\n"); 370 else 371 pr_info("Execute protection active, " 372 "mvcos not available\n"); 373 } else if (switch_amode) { 374 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY)) 375 pr_info("Address spaces switched, " 376 "mvcos available\n"); 377 else 378 pr_info("Address spaces switched, " 379 "mvcos not available\n"); 380 } 381 #ifdef CONFIG_TRACE_IRQFLAGS 382 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 383 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 384 #endif 385 } 386 387 static void __init 388 setup_lowcore(void) 389 { 390 struct _lowcore *lc; 391 int lc_pages; 392 393 /* 394 * Setup lowcore for boot cpu 395 */ 396 lc_pages = sizeof(void *) == 8 ? 2 : 1; 397 lc = (struct _lowcore *) 398 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 399 memset(lc, 0, lc_pages * PAGE_SIZE); 400 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 401 lc->restart_psw.addr = 402 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 403 if (switch_amode) 404 lc->restart_psw.mask |= PSW_ASC_HOME; 405 lc->external_new_psw.mask = psw_kernel_bits; 406 lc->external_new_psw.addr = 407 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 408 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 409 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 410 lc->program_new_psw.mask = psw_kernel_bits; 411 lc->program_new_psw.addr = 412 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 413 lc->mcck_new_psw.mask = 414 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 415 lc->mcck_new_psw.addr = 416 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 417 lc->io_new_psw.mask = psw_kernel_bits; 418 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 419 lc->clock_comparator = -1ULL; 420 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 421 lc->async_stack = (unsigned long) 422 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 423 lc->panic_stack = (unsigned long) 424 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 425 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 426 lc->thread_info = (unsigned long) &init_thread_union; 427 lc->machine_flags = S390_lowcore.machine_flags; 428 #ifndef CONFIG_64BIT 429 if (MACHINE_HAS_IEEE) { 430 lc->extended_save_area_addr = (__u32) 431 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 432 /* enable extended save area */ 433 __ctl_set_bit(14, 29); 434 } 435 #else 436 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 437 #endif 438 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 439 lc->async_enter_timer = S390_lowcore.async_enter_timer; 440 lc->exit_timer = S390_lowcore.exit_timer; 441 lc->user_timer = S390_lowcore.user_timer; 442 lc->system_timer = S390_lowcore.system_timer; 443 lc->steal_timer = S390_lowcore.steal_timer; 444 lc->last_update_timer = S390_lowcore.last_update_timer; 445 lc->last_update_clock = S390_lowcore.last_update_clock; 446 lc->ftrace_func = S390_lowcore.ftrace_func; 447 set_prefix((u32)(unsigned long) lc); 448 lowcore_ptr[0] = lc; 449 } 450 451 static void __init 452 setup_resources(void) 453 { 454 struct resource *res, *sub_res; 455 int i; 456 457 code_resource.start = (unsigned long) &_text; 458 code_resource.end = (unsigned long) &_etext - 1; 459 data_resource.start = (unsigned long) &_etext; 460 data_resource.end = (unsigned long) &_edata - 1; 461 462 for (i = 0; i < MEMORY_CHUNKS; i++) { 463 if (!memory_chunk[i].size) 464 continue; 465 res = alloc_bootmem_low(sizeof(struct resource)); 466 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 467 switch (memory_chunk[i].type) { 468 case CHUNK_READ_WRITE: 469 res->name = "System RAM"; 470 break; 471 case CHUNK_READ_ONLY: 472 res->name = "System ROM"; 473 res->flags |= IORESOURCE_READONLY; 474 break; 475 default: 476 res->name = "reserved"; 477 } 478 res->start = memory_chunk[i].addr; 479 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 480 request_resource(&iomem_resource, res); 481 482 if (code_resource.start >= res->start && 483 code_resource.start <= res->end && 484 code_resource.end > res->end) { 485 sub_res = alloc_bootmem_low(sizeof(struct resource)); 486 memcpy(sub_res, &code_resource, 487 sizeof(struct resource)); 488 sub_res->end = res->end; 489 code_resource.start = res->end + 1; 490 request_resource(res, sub_res); 491 } 492 493 if (code_resource.start >= res->start && 494 code_resource.start <= res->end && 495 code_resource.end <= res->end) 496 request_resource(res, &code_resource); 497 498 if (data_resource.start >= res->start && 499 data_resource.start <= res->end && 500 data_resource.end > res->end) { 501 sub_res = alloc_bootmem_low(sizeof(struct resource)); 502 memcpy(sub_res, &data_resource, 503 sizeof(struct resource)); 504 sub_res->end = res->end; 505 data_resource.start = res->end + 1; 506 request_resource(res, sub_res); 507 } 508 509 if (data_resource.start >= res->start && 510 data_resource.start <= res->end && 511 data_resource.end <= res->end) 512 request_resource(res, &data_resource); 513 } 514 } 515 516 unsigned long real_memory_size; 517 EXPORT_SYMBOL_GPL(real_memory_size); 518 519 static void __init setup_memory_end(void) 520 { 521 unsigned long memory_size; 522 unsigned long max_mem; 523 int i; 524 525 #ifdef CONFIG_ZFCPDUMP 526 if (ipl_info.type == IPL_TYPE_FCP_DUMP) { 527 memory_end = ZFCPDUMP_HSA_SIZE; 528 memory_end_set = 1; 529 } 530 #endif 531 memory_size = 0; 532 memory_end &= PAGE_MASK; 533 534 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 535 memory_end = min(max_mem, memory_end); 536 537 /* 538 * Make sure all chunks are MAX_ORDER aligned so we don't need the 539 * extra checks that HOLES_IN_ZONE would require. 540 */ 541 for (i = 0; i < MEMORY_CHUNKS; i++) { 542 unsigned long start, end; 543 struct mem_chunk *chunk; 544 unsigned long align; 545 546 chunk = &memory_chunk[i]; 547 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 548 start = (chunk->addr + align - 1) & ~(align - 1); 549 end = (chunk->addr + chunk->size) & ~(align - 1); 550 if (start >= end) 551 memset(chunk, 0, sizeof(*chunk)); 552 else { 553 chunk->addr = start; 554 chunk->size = end - start; 555 } 556 } 557 558 for (i = 0; i < MEMORY_CHUNKS; i++) { 559 struct mem_chunk *chunk = &memory_chunk[i]; 560 561 real_memory_size = max(real_memory_size, 562 chunk->addr + chunk->size); 563 if (chunk->addr >= max_mem) { 564 memset(chunk, 0, sizeof(*chunk)); 565 continue; 566 } 567 if (chunk->addr + chunk->size > max_mem) 568 chunk->size = max_mem - chunk->addr; 569 memory_size = max(memory_size, chunk->addr + chunk->size); 570 } 571 if (!memory_end) 572 memory_end = memory_size; 573 } 574 575 static void __init 576 setup_memory(void) 577 { 578 unsigned long bootmap_size; 579 unsigned long start_pfn, end_pfn; 580 int i; 581 582 /* 583 * partially used pages are not usable - thus 584 * we are rounding upwards: 585 */ 586 start_pfn = PFN_UP(__pa(&_end)); 587 end_pfn = max_pfn = PFN_DOWN(memory_end); 588 589 #ifdef CONFIG_BLK_DEV_INITRD 590 /* 591 * Move the initrd in case the bitmap of the bootmem allocater 592 * would overwrite it. 593 */ 594 595 if (INITRD_START && INITRD_SIZE) { 596 unsigned long bmap_size; 597 unsigned long start; 598 599 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 600 bmap_size = PFN_PHYS(bmap_size); 601 602 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 603 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 604 605 if (start + INITRD_SIZE > memory_end) { 606 pr_err("initrd extends beyond end of " 607 "memory (0x%08lx > 0x%08lx) " 608 "disabling initrd\n", 609 start + INITRD_SIZE, memory_end); 610 INITRD_START = INITRD_SIZE = 0; 611 } else { 612 pr_info("Moving initrd (0x%08lx -> " 613 "0x%08lx, size: %ld)\n", 614 INITRD_START, start, INITRD_SIZE); 615 memmove((void *) start, (void *) INITRD_START, 616 INITRD_SIZE); 617 INITRD_START = start; 618 } 619 } 620 } 621 #endif 622 623 /* 624 * Initialize the boot-time allocator 625 */ 626 bootmap_size = init_bootmem(start_pfn, end_pfn); 627 628 /* 629 * Register RAM areas with the bootmem allocator. 630 */ 631 632 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 633 unsigned long start_chunk, end_chunk, pfn; 634 635 if (memory_chunk[i].type != CHUNK_READ_WRITE) 636 continue; 637 start_chunk = PFN_DOWN(memory_chunk[i].addr); 638 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 639 end_chunk = min(end_chunk, end_pfn); 640 if (start_chunk >= end_chunk) 641 continue; 642 add_active_range(0, start_chunk, end_chunk); 643 pfn = max(start_chunk, start_pfn); 644 for (; pfn < end_chunk; pfn++) 645 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 646 } 647 648 psw_set_key(PAGE_DEFAULT_KEY); 649 650 free_bootmem_with_active_regions(0, max_pfn); 651 652 /* 653 * Reserve memory used for lowcore/command line/kernel image. 654 */ 655 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 656 reserve_bootmem((unsigned long)_stext, 657 PFN_PHYS(start_pfn) - (unsigned long)_stext, 658 BOOTMEM_DEFAULT); 659 /* 660 * Reserve the bootmem bitmap itself as well. We do this in two 661 * steps (first step was init_bootmem()) because this catches 662 * the (very unlikely) case of us accidentally initializing the 663 * bootmem allocator with an invalid RAM area. 664 */ 665 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 666 BOOTMEM_DEFAULT); 667 668 #ifdef CONFIG_BLK_DEV_INITRD 669 if (INITRD_START && INITRD_SIZE) { 670 if (INITRD_START + INITRD_SIZE <= memory_end) { 671 reserve_bootmem(INITRD_START, INITRD_SIZE, 672 BOOTMEM_DEFAULT); 673 initrd_start = INITRD_START; 674 initrd_end = initrd_start + INITRD_SIZE; 675 } else { 676 pr_err("initrd extends beyond end of " 677 "memory (0x%08lx > 0x%08lx) " 678 "disabling initrd\n", 679 initrd_start + INITRD_SIZE, memory_end); 680 initrd_start = initrd_end = 0; 681 } 682 } 683 #endif 684 } 685 686 /* 687 * Setup hardware capabilities. 688 */ 689 static void __init setup_hwcaps(void) 690 { 691 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 692 unsigned long long facility_list_extended; 693 unsigned int facility_list; 694 int i; 695 696 facility_list = stfl(); 697 /* 698 * The store facility list bits numbers as found in the principles 699 * of operation are numbered with bit 1UL<<31 as number 0 to 700 * bit 1UL<<0 as number 31. 701 * Bit 0: instructions named N3, "backported" to esa-mode 702 * Bit 2: z/Architecture mode is active 703 * Bit 7: the store-facility-list-extended facility is installed 704 * Bit 17: the message-security assist is installed 705 * Bit 19: the long-displacement facility is installed 706 * Bit 21: the extended-immediate facility is installed 707 * Bit 22: extended-translation facility 3 is installed 708 * Bit 30: extended-translation facility 3 enhancement facility 709 * These get translated to: 710 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 711 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 712 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 713 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 714 */ 715 for (i = 0; i < 6; i++) 716 if (facility_list & (1UL << (31 - stfl_bits[i]))) 717 elf_hwcap |= 1UL << i; 718 719 if ((facility_list & (1UL << (31 - 22))) 720 && (facility_list & (1UL << (31 - 30)))) 721 elf_hwcap |= 1UL << 8; 722 723 /* 724 * Check for additional facilities with store-facility-list-extended. 725 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 726 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 727 * as stored by stfl, bits 32-xxx contain additional facilities. 728 * How many facility words are stored depends on the number of 729 * doublewords passed to the instruction. The additional facilites 730 * are: 731 * Bit 42: decimal floating point facility is installed 732 * Bit 44: perform floating point operation facility is installed 733 * translated to: 734 * HWCAP_S390_DFP bit 6 (42 && 44). 735 */ 736 if ((elf_hwcap & (1UL << 2)) && 737 __stfle(&facility_list_extended, 1) > 0) { 738 if ((facility_list_extended & (1ULL << (63 - 42))) 739 && (facility_list_extended & (1ULL << (63 - 44)))) 740 elf_hwcap |= 1UL << 6; 741 } 742 743 if (MACHINE_HAS_HPAGE) 744 elf_hwcap |= 1UL << 7; 745 746 switch (S390_lowcore.cpu_id.machine) { 747 case 0x9672: 748 #if !defined(CONFIG_64BIT) 749 default: /* Use "g5" as default for 31 bit kernels. */ 750 #endif 751 strcpy(elf_platform, "g5"); 752 break; 753 case 0x2064: 754 case 0x2066: 755 #if defined(CONFIG_64BIT) 756 default: /* Use "z900" as default for 64 bit kernels. */ 757 #endif 758 strcpy(elf_platform, "z900"); 759 break; 760 case 0x2084: 761 case 0x2086: 762 strcpy(elf_platform, "z990"); 763 break; 764 case 0x2094: 765 case 0x2096: 766 strcpy(elf_platform, "z9-109"); 767 break; 768 case 0x2097: 769 case 0x2098: 770 strcpy(elf_platform, "z10"); 771 break; 772 } 773 } 774 775 /* 776 * Setup function called from init/main.c just after the banner 777 * was printed. 778 */ 779 780 void __init 781 setup_arch(char **cmdline_p) 782 { 783 /* set up preferred console */ 784 add_preferred_console("ttyS", 0, NULL); 785 786 /* 787 * print what head.S has found out about the machine 788 */ 789 #ifndef CONFIG_64BIT 790 if (MACHINE_IS_VM) 791 pr_info("Linux is running as a z/VM " 792 "guest operating system in 31-bit mode\n"); 793 else 794 pr_info("Linux is running natively in 31-bit mode\n"); 795 if (MACHINE_HAS_IEEE) 796 pr_info("The hardware system has IEEE compatible " 797 "floating point units\n"); 798 else 799 pr_info("The hardware system has no IEEE compatible " 800 "floating point units\n"); 801 #else /* CONFIG_64BIT */ 802 if (MACHINE_IS_VM) 803 pr_info("Linux is running as a z/VM " 804 "guest operating system in 64-bit mode\n"); 805 else if (MACHINE_IS_KVM) { 806 pr_info("Linux is running under KVM in 64-bit mode\n"); 807 add_preferred_console("hvc", 0, NULL); 808 s390_virtio_console_init(); 809 } else 810 pr_info("Linux is running natively in 64-bit mode\n"); 811 #endif /* CONFIG_64BIT */ 812 813 /* Have one command line that is parsed and saved in /proc/cmdline */ 814 /* boot_command_line has been already set up in early.c */ 815 *cmdline_p = boot_command_line; 816 817 ROOT_DEV = Root_RAM0; 818 819 init_mm.start_code = PAGE_OFFSET; 820 init_mm.end_code = (unsigned long) &_etext; 821 init_mm.end_data = (unsigned long) &_edata; 822 init_mm.brk = (unsigned long) &_end; 823 824 if (MACHINE_HAS_MVCOS) 825 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 826 else 827 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 828 829 parse_early_param(); 830 831 setup_ipl(); 832 setup_memory_end(); 833 setup_addressing_mode(); 834 setup_memory(); 835 setup_resources(); 836 setup_lowcore(); 837 838 cpu_init(); 839 __cpu_logical_map[0] = stap(); 840 s390_init_cpu_topology(); 841 842 /* 843 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 844 */ 845 setup_hwcaps(); 846 847 /* 848 * Create kernel page tables and switch to virtual addressing. 849 */ 850 paging_init(); 851 852 /* Setup default console */ 853 conmode_default(); 854 855 /* Setup zfcpdump support */ 856 setup_zfcpdump(console_devno); 857 } 858