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/user.h> 29 #include <linux/tty.h> 30 #include <linux/ioport.h> 31 #include <linux/delay.h> 32 #include <linux/init.h> 33 #include <linux/initrd.h> 34 #include <linux/bootmem.h> 35 #include <linux/root_dev.h> 36 #include <linux/console.h> 37 #include <linux/kernel_stat.h> 38 #include <linux/device.h> 39 #include <linux/notifier.h> 40 #include <linux/pfn.h> 41 #include <linux/ctype.h> 42 #include <linux/reboot.h> 43 #include <linux/topology.h> 44 #include <linux/ftrace.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 90 int __initdata memory_end_set; 91 unsigned long __initdata memory_end; 92 93 /* An array with a pointer to the lowcore of every CPU. */ 94 struct _lowcore *lowcore_ptr[NR_CPUS]; 95 EXPORT_SYMBOL(lowcore_ptr); 96 97 /* 98 * This is set up by the setup-routine at boot-time 99 * for S390 need to find out, what we have to setup 100 * using address 0x10400 ... 101 */ 102 103 #include <asm/setup.h> 104 105 static struct resource code_resource = { 106 .name = "Kernel code", 107 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 108 }; 109 110 static struct resource data_resource = { 111 .name = "Kernel data", 112 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 113 }; 114 115 /* 116 * cpu_init() initializes state that is per-CPU. 117 */ 118 void __cpuinit cpu_init(void) 119 { 120 /* 121 * Store processor id in lowcore (used e.g. in timer_interrupt) 122 */ 123 get_cpu_id(&S390_lowcore.cpu_id); 124 125 atomic_inc(&init_mm.mm_count); 126 current->active_mm = &init_mm; 127 BUG_ON(current->mm); 128 enter_lazy_tlb(&init_mm, current); 129 } 130 131 /* 132 * condev= and conmode= setup parameter. 133 */ 134 135 static int __init condev_setup(char *str) 136 { 137 int vdev; 138 139 vdev = simple_strtoul(str, &str, 0); 140 if (vdev >= 0 && vdev < 65536) { 141 console_devno = vdev; 142 console_irq = -1; 143 } 144 return 1; 145 } 146 147 __setup("condev=", condev_setup); 148 149 static void __init set_preferred_console(void) 150 { 151 if (MACHINE_IS_KVM) 152 add_preferred_console("hvc", 0, NULL); 153 else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 154 add_preferred_console("ttyS", 0, NULL); 155 else if (CONSOLE_IS_3270) 156 add_preferred_console("tty3270", 0, NULL); 157 } 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 set_preferred_console(); 174 return 1; 175 } 176 177 __setup("conmode=", conmode_setup); 178 179 static void __init conmode_default(void) 180 { 181 char query_buffer[1024]; 182 char *ptr; 183 184 if (MACHINE_IS_VM) { 185 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 186 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 187 ptr = strstr(query_buffer, "SUBCHANNEL ="); 188 console_irq = simple_strtoul(ptr + 13, NULL, 16); 189 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 190 ptr = strstr(query_buffer, "CONMODE"); 191 /* 192 * Set the conmode to 3215 so that the device recognition 193 * will set the cu_type of the console to 3215. If the 194 * conmode is 3270 and we don't set it back then both 195 * 3215 and the 3270 driver will try to access the console 196 * device (3215 as console and 3270 as normal tty). 197 */ 198 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 199 if (ptr == NULL) { 200 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 201 SET_CONSOLE_SCLP; 202 #endif 203 return; 204 } 205 if (strncmp(ptr + 8, "3270", 4) == 0) { 206 #if defined(CONFIG_TN3270_CONSOLE) 207 SET_CONSOLE_3270; 208 #elif defined(CONFIG_TN3215_CONSOLE) 209 SET_CONSOLE_3215; 210 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 211 SET_CONSOLE_SCLP; 212 #endif 213 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 214 #if defined(CONFIG_TN3215_CONSOLE) 215 SET_CONSOLE_3215; 216 #elif defined(CONFIG_TN3270_CONSOLE) 217 SET_CONSOLE_3270; 218 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 219 SET_CONSOLE_SCLP; 220 #endif 221 } 222 } else { 223 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 224 SET_CONSOLE_SCLP; 225 #endif 226 } 227 } 228 229 #ifdef CONFIG_ZFCPDUMP 230 static void __init setup_zfcpdump(unsigned int console_devno) 231 { 232 static char str[41]; 233 234 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 235 return; 236 if (console_devno != -1) 237 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 238 ipl_info.data.fcp.dev_id.devno, console_devno); 239 else 240 sprintf(str, " cio_ignore=all,!0.0.%04x", 241 ipl_info.data.fcp.dev_id.devno); 242 strcat(boot_command_line, str); 243 console_loglevel = 2; 244 } 245 #else 246 static inline void setup_zfcpdump(unsigned int console_devno) {} 247 #endif /* CONFIG_ZFCPDUMP */ 248 249 /* 250 * Reboot, halt and power_off stubs. They just call _machine_restart, 251 * _machine_halt or _machine_power_off. 252 */ 253 254 void machine_restart(char *command) 255 { 256 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 257 /* 258 * Only unblank the console if we are called in enabled 259 * context or a bust_spinlocks cleared the way for us. 260 */ 261 console_unblank(); 262 _machine_restart(command); 263 } 264 265 void machine_halt(void) 266 { 267 if (!in_interrupt() || oops_in_progress) 268 /* 269 * Only unblank the console if we are called in enabled 270 * context or a bust_spinlocks cleared the way for us. 271 */ 272 console_unblank(); 273 _machine_halt(); 274 } 275 276 void machine_power_off(void) 277 { 278 if (!in_interrupt() || oops_in_progress) 279 /* 280 * Only unblank the console if we are called in enabled 281 * context or a bust_spinlocks cleared the way for us. 282 */ 283 console_unblank(); 284 _machine_power_off(); 285 } 286 287 /* 288 * Dummy power off function. 289 */ 290 void (*pm_power_off)(void) = machine_power_off; 291 292 static int __init early_parse_mem(char *p) 293 { 294 memory_end = memparse(p, &p); 295 memory_end_set = 1; 296 return 0; 297 } 298 early_param("mem", early_parse_mem); 299 300 unsigned int user_mode = HOME_SPACE_MODE; 301 EXPORT_SYMBOL_GPL(user_mode); 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 if (user_mode != SECONDARY_SPACE_MODE) 335 user_mode = PRIMARY_SPACE_MODE; 336 return 0; 337 } 338 early_param("switch_amode", early_parse_switch_amode); 339 340 static int __init early_parse_user_mode(char *p) 341 { 342 if (p && strcmp(p, "primary") == 0) 343 user_mode = PRIMARY_SPACE_MODE; 344 #ifdef CONFIG_S390_EXEC_PROTECT 345 else if (p && strcmp(p, "secondary") == 0) 346 user_mode = SECONDARY_SPACE_MODE; 347 #endif 348 else if (!p || strcmp(p, "home") == 0) 349 user_mode = HOME_SPACE_MODE; 350 else 351 return 1; 352 return 0; 353 } 354 early_param("user_mode", early_parse_user_mode); 355 356 #ifdef CONFIG_S390_EXEC_PROTECT 357 /* 358 * Enable execute protection? 359 */ 360 static int __init early_parse_noexec(char *p) 361 { 362 if (!strncmp(p, "off", 3)) 363 return 0; 364 user_mode = SECONDARY_SPACE_MODE; 365 return 0; 366 } 367 early_param("noexec", early_parse_noexec); 368 #endif /* CONFIG_S390_EXEC_PROTECT */ 369 370 static void setup_addressing_mode(void) 371 { 372 if (user_mode == SECONDARY_SPACE_MODE) { 373 if (set_amode_and_uaccess(PSW_ASC_SECONDARY, 374 PSW32_ASC_SECONDARY)) 375 pr_info("Execute protection active, " 376 "mvcos available\n"); 377 else 378 pr_info("Execute protection active, " 379 "mvcos not available\n"); 380 } else if (user_mode == PRIMARY_SPACE_MODE) { 381 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY)) 382 pr_info("Address spaces switched, " 383 "mvcos available\n"); 384 else 385 pr_info("Address spaces switched, " 386 "mvcos not available\n"); 387 } 388 #ifdef CONFIG_TRACE_IRQFLAGS 389 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 390 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 391 #endif 392 } 393 394 static void __init 395 setup_lowcore(void) 396 { 397 struct _lowcore *lc; 398 399 /* 400 * Setup lowcore for boot cpu 401 */ 402 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); 403 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 404 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 405 lc->restart_psw.addr = 406 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 407 if (user_mode != HOME_SPACE_MODE) 408 lc->restart_psw.mask |= PSW_ASC_HOME; 409 lc->external_new_psw.mask = psw_kernel_bits; 410 lc->external_new_psw.addr = 411 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 412 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 413 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 414 lc->program_new_psw.mask = psw_kernel_bits; 415 lc->program_new_psw.addr = 416 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 417 lc->mcck_new_psw.mask = 418 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 419 lc->mcck_new_psw.addr = 420 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 421 lc->io_new_psw.mask = psw_kernel_bits; 422 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 423 lc->clock_comparator = -1ULL; 424 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 425 lc->async_stack = (unsigned long) 426 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 427 lc->panic_stack = (unsigned long) 428 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 429 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 430 lc->thread_info = (unsigned long) &init_thread_union; 431 lc->machine_flags = S390_lowcore.machine_flags; 432 #ifndef CONFIG_64BIT 433 if (MACHINE_HAS_IEEE) { 434 lc->extended_save_area_addr = (__u32) 435 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0); 436 /* enable extended save area */ 437 __ctl_set_bit(14, 29); 438 } 439 #else 440 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 441 #endif 442 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 443 lc->async_enter_timer = S390_lowcore.async_enter_timer; 444 lc->exit_timer = S390_lowcore.exit_timer; 445 lc->user_timer = S390_lowcore.user_timer; 446 lc->system_timer = S390_lowcore.system_timer; 447 lc->steal_timer = S390_lowcore.steal_timer; 448 lc->last_update_timer = S390_lowcore.last_update_timer; 449 lc->last_update_clock = S390_lowcore.last_update_clock; 450 lc->ftrace_func = S390_lowcore.ftrace_func; 451 set_prefix((u32)(unsigned long) lc); 452 lowcore_ptr[0] = lc; 453 } 454 455 static void __init 456 setup_resources(void) 457 { 458 struct resource *res, *sub_res; 459 int i; 460 461 code_resource.start = (unsigned long) &_text; 462 code_resource.end = (unsigned long) &_etext - 1; 463 data_resource.start = (unsigned long) &_etext; 464 data_resource.end = (unsigned long) &_edata - 1; 465 466 for (i = 0; i < MEMORY_CHUNKS; i++) { 467 if (!memory_chunk[i].size) 468 continue; 469 res = alloc_bootmem_low(sizeof(struct resource)); 470 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 471 switch (memory_chunk[i].type) { 472 case CHUNK_READ_WRITE: 473 res->name = "System RAM"; 474 break; 475 case CHUNK_READ_ONLY: 476 res->name = "System ROM"; 477 res->flags |= IORESOURCE_READONLY; 478 break; 479 default: 480 res->name = "reserved"; 481 } 482 res->start = memory_chunk[i].addr; 483 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 484 request_resource(&iomem_resource, res); 485 486 if (code_resource.start >= res->start && 487 code_resource.start <= res->end && 488 code_resource.end > res->end) { 489 sub_res = alloc_bootmem_low(sizeof(struct resource)); 490 memcpy(sub_res, &code_resource, 491 sizeof(struct resource)); 492 sub_res->end = res->end; 493 code_resource.start = res->end + 1; 494 request_resource(res, sub_res); 495 } 496 497 if (code_resource.start >= res->start && 498 code_resource.start <= res->end && 499 code_resource.end <= res->end) 500 request_resource(res, &code_resource); 501 502 if (data_resource.start >= res->start && 503 data_resource.start <= res->end && 504 data_resource.end > res->end) { 505 sub_res = alloc_bootmem_low(sizeof(struct resource)); 506 memcpy(sub_res, &data_resource, 507 sizeof(struct resource)); 508 sub_res->end = res->end; 509 data_resource.start = res->end + 1; 510 request_resource(res, sub_res); 511 } 512 513 if (data_resource.start >= res->start && 514 data_resource.start <= res->end && 515 data_resource.end <= res->end) 516 request_resource(res, &data_resource); 517 } 518 } 519 520 unsigned long real_memory_size; 521 EXPORT_SYMBOL_GPL(real_memory_size); 522 523 static void __init setup_memory_end(void) 524 { 525 unsigned long memory_size; 526 unsigned long max_mem; 527 int i; 528 529 #ifdef CONFIG_ZFCPDUMP 530 if (ipl_info.type == IPL_TYPE_FCP_DUMP) { 531 memory_end = ZFCPDUMP_HSA_SIZE; 532 memory_end_set = 1; 533 } 534 #endif 535 memory_size = 0; 536 memory_end &= PAGE_MASK; 537 538 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 539 memory_end = min(max_mem, memory_end); 540 541 /* 542 * Make sure all chunks are MAX_ORDER aligned so we don't need the 543 * extra checks that HOLES_IN_ZONE would require. 544 */ 545 for (i = 0; i < MEMORY_CHUNKS; i++) { 546 unsigned long start, end; 547 struct mem_chunk *chunk; 548 unsigned long align; 549 550 chunk = &memory_chunk[i]; 551 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 552 start = (chunk->addr + align - 1) & ~(align - 1); 553 end = (chunk->addr + chunk->size) & ~(align - 1); 554 if (start >= end) 555 memset(chunk, 0, sizeof(*chunk)); 556 else { 557 chunk->addr = start; 558 chunk->size = end - start; 559 } 560 } 561 562 for (i = 0; i < MEMORY_CHUNKS; i++) { 563 struct mem_chunk *chunk = &memory_chunk[i]; 564 565 real_memory_size = max(real_memory_size, 566 chunk->addr + chunk->size); 567 if (chunk->addr >= max_mem) { 568 memset(chunk, 0, sizeof(*chunk)); 569 continue; 570 } 571 if (chunk->addr + chunk->size > max_mem) 572 chunk->size = max_mem - chunk->addr; 573 memory_size = max(memory_size, chunk->addr + chunk->size); 574 } 575 if (!memory_end) 576 memory_end = memory_size; 577 } 578 579 static void __init 580 setup_memory(void) 581 { 582 unsigned long bootmap_size; 583 unsigned long start_pfn, end_pfn; 584 int i; 585 586 /* 587 * partially used pages are not usable - thus 588 * we are rounding upwards: 589 */ 590 start_pfn = PFN_UP(__pa(&_end)); 591 end_pfn = max_pfn = PFN_DOWN(memory_end); 592 593 #ifdef CONFIG_BLK_DEV_INITRD 594 /* 595 * Move the initrd in case the bitmap of the bootmem allocater 596 * would overwrite it. 597 */ 598 599 if (INITRD_START && INITRD_SIZE) { 600 unsigned long bmap_size; 601 unsigned long start; 602 603 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 604 bmap_size = PFN_PHYS(bmap_size); 605 606 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 607 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 608 609 if (start + INITRD_SIZE > memory_end) { 610 pr_err("initrd extends beyond end of " 611 "memory (0x%08lx > 0x%08lx) " 612 "disabling initrd\n", 613 start + INITRD_SIZE, memory_end); 614 INITRD_START = INITRD_SIZE = 0; 615 } else { 616 pr_info("Moving initrd (0x%08lx -> " 617 "0x%08lx, size: %ld)\n", 618 INITRD_START, start, INITRD_SIZE); 619 memmove((void *) start, (void *) INITRD_START, 620 INITRD_SIZE); 621 INITRD_START = start; 622 } 623 } 624 } 625 #endif 626 627 /* 628 * Initialize the boot-time allocator 629 */ 630 bootmap_size = init_bootmem(start_pfn, end_pfn); 631 632 /* 633 * Register RAM areas with the bootmem allocator. 634 */ 635 636 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 637 unsigned long start_chunk, end_chunk, pfn; 638 639 if (memory_chunk[i].type != CHUNK_READ_WRITE) 640 continue; 641 start_chunk = PFN_DOWN(memory_chunk[i].addr); 642 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 643 end_chunk = min(end_chunk, end_pfn); 644 if (start_chunk >= end_chunk) 645 continue; 646 add_active_range(0, start_chunk, end_chunk); 647 pfn = max(start_chunk, start_pfn); 648 for (; pfn < end_chunk; pfn++) 649 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 650 } 651 652 psw_set_key(PAGE_DEFAULT_KEY); 653 654 free_bootmem_with_active_regions(0, max_pfn); 655 656 /* 657 * Reserve memory used for lowcore/command line/kernel image. 658 */ 659 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 660 reserve_bootmem((unsigned long)_stext, 661 PFN_PHYS(start_pfn) - (unsigned long)_stext, 662 BOOTMEM_DEFAULT); 663 /* 664 * Reserve the bootmem bitmap itself as well. We do this in two 665 * steps (first step was init_bootmem()) because this catches 666 * the (very unlikely) case of us accidentally initializing the 667 * bootmem allocator with an invalid RAM area. 668 */ 669 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 670 BOOTMEM_DEFAULT); 671 672 #ifdef CONFIG_BLK_DEV_INITRD 673 if (INITRD_START && INITRD_SIZE) { 674 if (INITRD_START + INITRD_SIZE <= memory_end) { 675 reserve_bootmem(INITRD_START, INITRD_SIZE, 676 BOOTMEM_DEFAULT); 677 initrd_start = INITRD_START; 678 initrd_end = initrd_start + INITRD_SIZE; 679 } else { 680 pr_err("initrd extends beyond end of " 681 "memory (0x%08lx > 0x%08lx) " 682 "disabling initrd\n", 683 initrd_start + INITRD_SIZE, memory_end); 684 initrd_start = initrd_end = 0; 685 } 686 } 687 #endif 688 } 689 690 /* 691 * Setup hardware capabilities. 692 */ 693 static void __init setup_hwcaps(void) 694 { 695 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 696 unsigned long long facility_list_extended; 697 unsigned int facility_list; 698 int i; 699 700 facility_list = stfl(); 701 /* 702 * The store facility list bits numbers as found in the principles 703 * of operation are numbered with bit 1UL<<31 as number 0 to 704 * bit 1UL<<0 as number 31. 705 * Bit 0: instructions named N3, "backported" to esa-mode 706 * Bit 2: z/Architecture mode is active 707 * Bit 7: the store-facility-list-extended facility is installed 708 * Bit 17: the message-security assist is installed 709 * Bit 19: the long-displacement facility is installed 710 * Bit 21: the extended-immediate facility is installed 711 * Bit 22: extended-translation facility 3 is installed 712 * Bit 30: extended-translation facility 3 enhancement facility 713 * These get translated to: 714 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 715 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 716 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 717 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 718 */ 719 for (i = 0; i < 6; i++) 720 if (facility_list & (1UL << (31 - stfl_bits[i]))) 721 elf_hwcap |= 1UL << i; 722 723 if ((facility_list & (1UL << (31 - 22))) 724 && (facility_list & (1UL << (31 - 30)))) 725 elf_hwcap |= HWCAP_S390_ETF3EH; 726 727 /* 728 * Check for additional facilities with store-facility-list-extended. 729 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 730 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 731 * as stored by stfl, bits 32-xxx contain additional facilities. 732 * How many facility words are stored depends on the number of 733 * doublewords passed to the instruction. The additional facilites 734 * are: 735 * Bit 42: decimal floating point facility is installed 736 * Bit 44: perform floating point operation facility is installed 737 * translated to: 738 * HWCAP_S390_DFP bit 6 (42 && 44). 739 */ 740 if ((elf_hwcap & (1UL << 2)) && 741 __stfle(&facility_list_extended, 1) > 0) { 742 if ((facility_list_extended & (1ULL << (63 - 42))) 743 && (facility_list_extended & (1ULL << (63 - 44)))) 744 elf_hwcap |= HWCAP_S390_DFP; 745 } 746 747 /* 748 * Huge page support HWCAP_S390_HPAGE is bit 7. 749 */ 750 if (MACHINE_HAS_HPAGE) 751 elf_hwcap |= HWCAP_S390_HPAGE; 752 753 /* 754 * 64-bit register support for 31-bit processes 755 * HWCAP_S390_HIGH_GPRS is bit 9. 756 */ 757 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 758 759 switch (S390_lowcore.cpu_id.machine) { 760 case 0x9672: 761 #if !defined(CONFIG_64BIT) 762 default: /* Use "g5" as default for 31 bit kernels. */ 763 #endif 764 strcpy(elf_platform, "g5"); 765 break; 766 case 0x2064: 767 case 0x2066: 768 #if defined(CONFIG_64BIT) 769 default: /* Use "z900" as default for 64 bit kernels. */ 770 #endif 771 strcpy(elf_platform, "z900"); 772 break; 773 case 0x2084: 774 case 0x2086: 775 strcpy(elf_platform, "z990"); 776 break; 777 case 0x2094: 778 case 0x2096: 779 strcpy(elf_platform, "z9-109"); 780 break; 781 case 0x2097: 782 case 0x2098: 783 strcpy(elf_platform, "z10"); 784 break; 785 } 786 } 787 788 /* 789 * Setup function called from init/main.c just after the banner 790 * was printed. 791 */ 792 793 void __init 794 setup_arch(char **cmdline_p) 795 { 796 /* 797 * print what head.S has found out about the machine 798 */ 799 #ifndef CONFIG_64BIT 800 if (MACHINE_IS_VM) 801 pr_info("Linux is running as a z/VM " 802 "guest operating system in 31-bit mode\n"); 803 else if (MACHINE_IS_LPAR) 804 pr_info("Linux is running natively in 31-bit mode\n"); 805 if (MACHINE_HAS_IEEE) 806 pr_info("The hardware system has IEEE compatible " 807 "floating point units\n"); 808 else 809 pr_info("The hardware system has no IEEE compatible " 810 "floating point units\n"); 811 #else /* CONFIG_64BIT */ 812 if (MACHINE_IS_VM) 813 pr_info("Linux is running as a z/VM " 814 "guest operating system in 64-bit mode\n"); 815 else if (MACHINE_IS_KVM) 816 pr_info("Linux is running under KVM in 64-bit mode\n"); 817 else if (MACHINE_IS_LPAR) 818 pr_info("Linux is running natively in 64-bit mode\n"); 819 #endif /* CONFIG_64BIT */ 820 821 /* Have one command line that is parsed and saved in /proc/cmdline */ 822 /* boot_command_line has been already set up in early.c */ 823 *cmdline_p = boot_command_line; 824 825 ROOT_DEV = Root_RAM0; 826 827 init_mm.start_code = PAGE_OFFSET; 828 init_mm.end_code = (unsigned long) &_etext; 829 init_mm.end_data = (unsigned long) &_edata; 830 init_mm.brk = (unsigned long) &_end; 831 832 if (MACHINE_HAS_MVCOS) 833 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 834 else 835 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 836 837 parse_early_param(); 838 839 setup_ipl(); 840 setup_memory_end(); 841 setup_addressing_mode(); 842 setup_memory(); 843 setup_resources(); 844 setup_lowcore(); 845 846 cpu_init(); 847 s390_init_cpu_topology(); 848 849 /* 850 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 851 */ 852 setup_hwcaps(); 853 854 /* 855 * Create kernel page tables and switch to virtual addressing. 856 */ 857 paging_init(); 858 859 /* Setup default console */ 860 conmode_default(); 861 set_preferred_console(); 862 863 /* Setup zfcpdump support */ 864 setup_zfcpdump(console_devno); 865 } 866