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 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 atomic_inc(&init_mm.mm_count); 127 current->active_mm = &init_mm; 128 BUG_ON(current->mm); 129 enter_lazy_tlb(&init_mm, current); 130 } 131 132 /* 133 * condev= and conmode= setup parameter. 134 */ 135 136 static int __init condev_setup(char *str) 137 { 138 int vdev; 139 140 vdev = simple_strtoul(str, &str, 0); 141 if (vdev >= 0 && vdev < 65536) { 142 console_devno = vdev; 143 console_irq = -1; 144 } 145 return 1; 146 } 147 148 __setup("condev=", condev_setup); 149 150 static void __init set_preferred_console(void) 151 { 152 if (MACHINE_IS_KVM) 153 add_preferred_console("hvc", 0, NULL); 154 else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 155 add_preferred_console("ttyS", 0, NULL); 156 else if (CONSOLE_IS_3270) 157 add_preferred_console("tty3270", 0, NULL); 158 } 159 160 static int __init conmode_setup(char *str) 161 { 162 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 163 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 164 SET_CONSOLE_SCLP; 165 #endif 166 #if defined(CONFIG_TN3215_CONSOLE) 167 if (strncmp(str, "3215", 5) == 0) 168 SET_CONSOLE_3215; 169 #endif 170 #if defined(CONFIG_TN3270_CONSOLE) 171 if (strncmp(str, "3270", 5) == 0) 172 SET_CONSOLE_3270; 173 #endif 174 set_preferred_console(); 175 return 1; 176 } 177 178 __setup("conmode=", conmode_setup); 179 180 static void __init conmode_default(void) 181 { 182 char query_buffer[1024]; 183 char *ptr; 184 185 if (MACHINE_IS_VM) { 186 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 187 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 188 ptr = strstr(query_buffer, "SUBCHANNEL ="); 189 console_irq = simple_strtoul(ptr + 13, NULL, 16); 190 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 191 ptr = strstr(query_buffer, "CONMODE"); 192 /* 193 * Set the conmode to 3215 so that the device recognition 194 * will set the cu_type of the console to 3215. If the 195 * conmode is 3270 and we don't set it back then both 196 * 3215 and the 3270 driver will try to access the console 197 * device (3215 as console and 3270 as normal tty). 198 */ 199 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 200 if (ptr == NULL) { 201 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 202 SET_CONSOLE_SCLP; 203 #endif 204 return; 205 } 206 if (strncmp(ptr + 8, "3270", 4) == 0) { 207 #if defined(CONFIG_TN3270_CONSOLE) 208 SET_CONSOLE_3270; 209 #elif defined(CONFIG_TN3215_CONSOLE) 210 SET_CONSOLE_3215; 211 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 212 SET_CONSOLE_SCLP; 213 #endif 214 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 215 #if defined(CONFIG_TN3215_CONSOLE) 216 SET_CONSOLE_3215; 217 #elif defined(CONFIG_TN3270_CONSOLE) 218 SET_CONSOLE_3270; 219 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 220 SET_CONSOLE_SCLP; 221 #endif 222 } 223 } else { 224 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 225 SET_CONSOLE_SCLP; 226 #endif 227 } 228 } 229 230 #ifdef CONFIG_ZFCPDUMP 231 static void __init setup_zfcpdump(unsigned int console_devno) 232 { 233 static char str[41]; 234 235 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 236 return; 237 if (console_devno != -1) 238 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 239 ipl_info.data.fcp.dev_id.devno, console_devno); 240 else 241 sprintf(str, " cio_ignore=all,!0.0.%04x", 242 ipl_info.data.fcp.dev_id.devno); 243 strcat(boot_command_line, str); 244 console_loglevel = 2; 245 } 246 #else 247 static inline void setup_zfcpdump(unsigned int console_devno) {} 248 #endif /* CONFIG_ZFCPDUMP */ 249 250 /* 251 * Reboot, halt and power_off stubs. They just call _machine_restart, 252 * _machine_halt or _machine_power_off. 253 */ 254 255 void machine_restart(char *command) 256 { 257 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 258 /* 259 * Only unblank the console if we are called in enabled 260 * context or a bust_spinlocks cleared the way for us. 261 */ 262 console_unblank(); 263 _machine_restart(command); 264 } 265 266 void machine_halt(void) 267 { 268 if (!in_interrupt() || oops_in_progress) 269 /* 270 * Only unblank the console if we are called in enabled 271 * context or a bust_spinlocks cleared the way for us. 272 */ 273 console_unblank(); 274 _machine_halt(); 275 } 276 277 void machine_power_off(void) 278 { 279 if (!in_interrupt() || oops_in_progress) 280 /* 281 * Only unblank the console if we are called in enabled 282 * context or a bust_spinlocks cleared the way for us. 283 */ 284 console_unblank(); 285 _machine_power_off(); 286 } 287 288 /* 289 * Dummy power off function. 290 */ 291 void (*pm_power_off)(void) = machine_power_off; 292 293 static int __init early_parse_mem(char *p) 294 { 295 memory_end = memparse(p, &p); 296 memory_end_set = 1; 297 return 0; 298 } 299 early_param("mem", early_parse_mem); 300 301 unsigned int user_mode = HOME_SPACE_MODE; 302 EXPORT_SYMBOL_GPL(user_mode); 303 304 static int set_amode_and_uaccess(unsigned long user_amode, 305 unsigned long user32_amode) 306 { 307 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 308 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 309 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 310 #ifdef CONFIG_COMPAT 311 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 312 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 313 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 314 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 315 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 316 PSW32_MASK_PSTATE; 317 #endif 318 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 319 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 320 321 if (MACHINE_HAS_MVCOS) { 322 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 323 return 1; 324 } else { 325 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 326 return 0; 327 } 328 } 329 330 /* 331 * Switch kernel/user addressing modes? 332 */ 333 static int __init early_parse_switch_amode(char *p) 334 { 335 if (user_mode != SECONDARY_SPACE_MODE) 336 user_mode = PRIMARY_SPACE_MODE; 337 return 0; 338 } 339 early_param("switch_amode", early_parse_switch_amode); 340 341 static int __init early_parse_user_mode(char *p) 342 { 343 if (p && strcmp(p, "primary") == 0) 344 user_mode = PRIMARY_SPACE_MODE; 345 #ifdef CONFIG_S390_EXEC_PROTECT 346 else if (p && strcmp(p, "secondary") == 0) 347 user_mode = SECONDARY_SPACE_MODE; 348 #endif 349 else if (!p || strcmp(p, "home") == 0) 350 user_mode = HOME_SPACE_MODE; 351 else 352 return 1; 353 return 0; 354 } 355 early_param("user_mode", early_parse_user_mode); 356 357 #ifdef CONFIG_S390_EXEC_PROTECT 358 /* 359 * Enable execute protection? 360 */ 361 static int __init early_parse_noexec(char *p) 362 { 363 if (!strncmp(p, "off", 3)) 364 return 0; 365 user_mode = SECONDARY_SPACE_MODE; 366 return 0; 367 } 368 early_param("noexec", early_parse_noexec); 369 #endif /* CONFIG_S390_EXEC_PROTECT */ 370 371 static void setup_addressing_mode(void) 372 { 373 if (user_mode == SECONDARY_SPACE_MODE) { 374 if (set_amode_and_uaccess(PSW_ASC_SECONDARY, 375 PSW32_ASC_SECONDARY)) 376 pr_info("Execute protection active, " 377 "mvcos available\n"); 378 else 379 pr_info("Execute protection active, " 380 "mvcos not available\n"); 381 } else if (user_mode == PRIMARY_SPACE_MODE) { 382 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY)) 383 pr_info("Address spaces switched, " 384 "mvcos available\n"); 385 else 386 pr_info("Address spaces switched, " 387 "mvcos not available\n"); 388 } 389 #ifdef CONFIG_TRACE_IRQFLAGS 390 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 391 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 392 #endif 393 } 394 395 static void __init 396 setup_lowcore(void) 397 { 398 struct _lowcore *lc; 399 400 /* 401 * Setup lowcore for boot cpu 402 */ 403 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); 404 lc = __alloc_bootmem(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 405 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 406 lc->restart_psw.addr = 407 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 408 if (user_mode != HOME_SPACE_MODE) 409 lc->restart_psw.mask |= PSW_ASC_HOME; 410 lc->external_new_psw.mask = psw_kernel_bits; 411 lc->external_new_psw.addr = 412 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 413 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 414 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 415 lc->program_new_psw.mask = psw_kernel_bits; 416 lc->program_new_psw.addr = 417 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 418 lc->mcck_new_psw.mask = 419 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 420 lc->mcck_new_psw.addr = 421 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 422 lc->io_new_psw.mask = psw_kernel_bits; 423 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 424 lc->clock_comparator = -1ULL; 425 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 426 lc->async_stack = (unsigned long) 427 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 428 lc->panic_stack = (unsigned long) 429 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 430 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 431 lc->thread_info = (unsigned long) &init_thread_union; 432 lc->machine_flags = S390_lowcore.machine_flags; 433 #ifndef CONFIG_64BIT 434 if (MACHINE_HAS_IEEE) { 435 lc->extended_save_area_addr = (__u32) 436 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 437 /* enable extended save area */ 438 __ctl_set_bit(14, 29); 439 } 440 #else 441 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 442 #endif 443 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 444 lc->async_enter_timer = S390_lowcore.async_enter_timer; 445 lc->exit_timer = S390_lowcore.exit_timer; 446 lc->user_timer = S390_lowcore.user_timer; 447 lc->system_timer = S390_lowcore.system_timer; 448 lc->steal_timer = S390_lowcore.steal_timer; 449 lc->last_update_timer = S390_lowcore.last_update_timer; 450 lc->last_update_clock = S390_lowcore.last_update_clock; 451 lc->ftrace_func = S390_lowcore.ftrace_func; 452 set_prefix((u32)(unsigned long) lc); 453 lowcore_ptr[0] = lc; 454 } 455 456 static void __init 457 setup_resources(void) 458 { 459 struct resource *res, *sub_res; 460 int i; 461 462 code_resource.start = (unsigned long) &_text; 463 code_resource.end = (unsigned long) &_etext - 1; 464 data_resource.start = (unsigned long) &_etext; 465 data_resource.end = (unsigned long) &_edata - 1; 466 467 for (i = 0; i < MEMORY_CHUNKS; i++) { 468 if (!memory_chunk[i].size) 469 continue; 470 res = alloc_bootmem_low(sizeof(struct resource)); 471 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 472 switch (memory_chunk[i].type) { 473 case CHUNK_READ_WRITE: 474 res->name = "System RAM"; 475 break; 476 case CHUNK_READ_ONLY: 477 res->name = "System ROM"; 478 res->flags |= IORESOURCE_READONLY; 479 break; 480 default: 481 res->name = "reserved"; 482 } 483 res->start = memory_chunk[i].addr; 484 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 485 request_resource(&iomem_resource, res); 486 487 if (code_resource.start >= res->start && 488 code_resource.start <= res->end && 489 code_resource.end > res->end) { 490 sub_res = alloc_bootmem_low(sizeof(struct resource)); 491 memcpy(sub_res, &code_resource, 492 sizeof(struct resource)); 493 sub_res->end = res->end; 494 code_resource.start = res->end + 1; 495 request_resource(res, sub_res); 496 } 497 498 if (code_resource.start >= res->start && 499 code_resource.start <= res->end && 500 code_resource.end <= res->end) 501 request_resource(res, &code_resource); 502 503 if (data_resource.start >= res->start && 504 data_resource.start <= res->end && 505 data_resource.end > res->end) { 506 sub_res = alloc_bootmem_low(sizeof(struct resource)); 507 memcpy(sub_res, &data_resource, 508 sizeof(struct resource)); 509 sub_res->end = res->end; 510 data_resource.start = res->end + 1; 511 request_resource(res, sub_res); 512 } 513 514 if (data_resource.start >= res->start && 515 data_resource.start <= res->end && 516 data_resource.end <= res->end) 517 request_resource(res, &data_resource); 518 } 519 } 520 521 unsigned long real_memory_size; 522 EXPORT_SYMBOL_GPL(real_memory_size); 523 524 static void __init setup_memory_end(void) 525 { 526 unsigned long memory_size; 527 unsigned long max_mem; 528 int i; 529 530 #ifdef CONFIG_ZFCPDUMP 531 if (ipl_info.type == IPL_TYPE_FCP_DUMP) { 532 memory_end = ZFCPDUMP_HSA_SIZE; 533 memory_end_set = 1; 534 } 535 #endif 536 memory_size = 0; 537 memory_end &= PAGE_MASK; 538 539 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 540 memory_end = min(max_mem, memory_end); 541 542 /* 543 * Make sure all chunks are MAX_ORDER aligned so we don't need the 544 * extra checks that HOLES_IN_ZONE would require. 545 */ 546 for (i = 0; i < MEMORY_CHUNKS; i++) { 547 unsigned long start, end; 548 struct mem_chunk *chunk; 549 unsigned long align; 550 551 chunk = &memory_chunk[i]; 552 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 553 start = (chunk->addr + align - 1) & ~(align - 1); 554 end = (chunk->addr + chunk->size) & ~(align - 1); 555 if (start >= end) 556 memset(chunk, 0, sizeof(*chunk)); 557 else { 558 chunk->addr = start; 559 chunk->size = end - start; 560 } 561 } 562 563 for (i = 0; i < MEMORY_CHUNKS; i++) { 564 struct mem_chunk *chunk = &memory_chunk[i]; 565 566 real_memory_size = max(real_memory_size, 567 chunk->addr + chunk->size); 568 if (chunk->addr >= max_mem) { 569 memset(chunk, 0, sizeof(*chunk)); 570 continue; 571 } 572 if (chunk->addr + chunk->size > max_mem) 573 chunk->size = max_mem - chunk->addr; 574 memory_size = max(memory_size, chunk->addr + chunk->size); 575 } 576 if (!memory_end) 577 memory_end = memory_size; 578 } 579 580 static void __init 581 setup_memory(void) 582 { 583 unsigned long bootmap_size; 584 unsigned long start_pfn, end_pfn; 585 int i; 586 587 /* 588 * partially used pages are not usable - thus 589 * we are rounding upwards: 590 */ 591 start_pfn = PFN_UP(__pa(&_end)); 592 end_pfn = max_pfn = PFN_DOWN(memory_end); 593 594 #ifdef CONFIG_BLK_DEV_INITRD 595 /* 596 * Move the initrd in case the bitmap of the bootmem allocater 597 * would overwrite it. 598 */ 599 600 if (INITRD_START && INITRD_SIZE) { 601 unsigned long bmap_size; 602 unsigned long start; 603 604 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 605 bmap_size = PFN_PHYS(bmap_size); 606 607 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 608 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 609 610 if (start + INITRD_SIZE > memory_end) { 611 pr_err("initrd extends beyond end of " 612 "memory (0x%08lx > 0x%08lx) " 613 "disabling initrd\n", 614 start + INITRD_SIZE, memory_end); 615 INITRD_START = INITRD_SIZE = 0; 616 } else { 617 pr_info("Moving initrd (0x%08lx -> " 618 "0x%08lx, size: %ld)\n", 619 INITRD_START, start, INITRD_SIZE); 620 memmove((void *) start, (void *) INITRD_START, 621 INITRD_SIZE); 622 INITRD_START = start; 623 } 624 } 625 } 626 #endif 627 628 /* 629 * Initialize the boot-time allocator 630 */ 631 bootmap_size = init_bootmem(start_pfn, end_pfn); 632 633 /* 634 * Register RAM areas with the bootmem allocator. 635 */ 636 637 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 638 unsigned long start_chunk, end_chunk, pfn; 639 640 if (memory_chunk[i].type != CHUNK_READ_WRITE) 641 continue; 642 start_chunk = PFN_DOWN(memory_chunk[i].addr); 643 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 644 end_chunk = min(end_chunk, end_pfn); 645 if (start_chunk >= end_chunk) 646 continue; 647 add_active_range(0, start_chunk, end_chunk); 648 pfn = max(start_chunk, start_pfn); 649 for (; pfn < end_chunk; pfn++) 650 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 651 } 652 653 psw_set_key(PAGE_DEFAULT_KEY); 654 655 free_bootmem_with_active_regions(0, max_pfn); 656 657 /* 658 * Reserve memory used for lowcore/command line/kernel image. 659 */ 660 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 661 reserve_bootmem((unsigned long)_stext, 662 PFN_PHYS(start_pfn) - (unsigned long)_stext, 663 BOOTMEM_DEFAULT); 664 /* 665 * Reserve the bootmem bitmap itself as well. We do this in two 666 * steps (first step was init_bootmem()) because this catches 667 * the (very unlikely) case of us accidentally initializing the 668 * bootmem allocator with an invalid RAM area. 669 */ 670 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 671 BOOTMEM_DEFAULT); 672 673 #ifdef CONFIG_BLK_DEV_INITRD 674 if (INITRD_START && INITRD_SIZE) { 675 if (INITRD_START + INITRD_SIZE <= memory_end) { 676 reserve_bootmem(INITRD_START, INITRD_SIZE, 677 BOOTMEM_DEFAULT); 678 initrd_start = INITRD_START; 679 initrd_end = initrd_start + INITRD_SIZE; 680 } else { 681 pr_err("initrd extends beyond end of " 682 "memory (0x%08lx > 0x%08lx) " 683 "disabling initrd\n", 684 initrd_start + INITRD_SIZE, memory_end); 685 initrd_start = initrd_end = 0; 686 } 687 } 688 #endif 689 } 690 691 /* 692 * Setup hardware capabilities. 693 */ 694 static void __init setup_hwcaps(void) 695 { 696 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 697 unsigned long long facility_list_extended; 698 unsigned int facility_list; 699 int i; 700 701 facility_list = stfl(); 702 /* 703 * The store facility list bits numbers as found in the principles 704 * of operation are numbered with bit 1UL<<31 as number 0 to 705 * bit 1UL<<0 as number 31. 706 * Bit 0: instructions named N3, "backported" to esa-mode 707 * Bit 2: z/Architecture mode is active 708 * Bit 7: the store-facility-list-extended facility is installed 709 * Bit 17: the message-security assist is installed 710 * Bit 19: the long-displacement facility is installed 711 * Bit 21: the extended-immediate facility is installed 712 * Bit 22: extended-translation facility 3 is installed 713 * Bit 30: extended-translation facility 3 enhancement facility 714 * These get translated to: 715 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 716 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 717 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 718 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 719 */ 720 for (i = 0; i < 6; i++) 721 if (facility_list & (1UL << (31 - stfl_bits[i]))) 722 elf_hwcap |= 1UL << i; 723 724 if ((facility_list & (1UL << (31 - 22))) 725 && (facility_list & (1UL << (31 - 30)))) 726 elf_hwcap |= HWCAP_S390_ETF3EH; 727 728 /* 729 * Check for additional facilities with store-facility-list-extended. 730 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 731 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 732 * as stored by stfl, bits 32-xxx contain additional facilities. 733 * How many facility words are stored depends on the number of 734 * doublewords passed to the instruction. The additional facilites 735 * are: 736 * Bit 42: decimal floating point facility is installed 737 * Bit 44: perform floating point operation facility is installed 738 * translated to: 739 * HWCAP_S390_DFP bit 6 (42 && 44). 740 */ 741 if ((elf_hwcap & (1UL << 2)) && 742 __stfle(&facility_list_extended, 1) > 0) { 743 if ((facility_list_extended & (1ULL << (63 - 42))) 744 && (facility_list_extended & (1ULL << (63 - 44)))) 745 elf_hwcap |= HWCAP_S390_DFP; 746 } 747 748 /* 749 * Huge page support HWCAP_S390_HPAGE is bit 7. 750 */ 751 if (MACHINE_HAS_HPAGE) 752 elf_hwcap |= HWCAP_S390_HPAGE; 753 754 /* 755 * 64-bit register support for 31-bit processes 756 * HWCAP_S390_HIGH_GPRS is bit 9. 757 */ 758 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 759 760 switch (S390_lowcore.cpu_id.machine) { 761 case 0x9672: 762 #if !defined(CONFIG_64BIT) 763 default: /* Use "g5" as default for 31 bit kernels. */ 764 #endif 765 strcpy(elf_platform, "g5"); 766 break; 767 case 0x2064: 768 case 0x2066: 769 #if defined(CONFIG_64BIT) 770 default: /* Use "z900" as default for 64 bit kernels. */ 771 #endif 772 strcpy(elf_platform, "z900"); 773 break; 774 case 0x2084: 775 case 0x2086: 776 strcpy(elf_platform, "z990"); 777 break; 778 case 0x2094: 779 case 0x2096: 780 strcpy(elf_platform, "z9-109"); 781 break; 782 case 0x2097: 783 case 0x2098: 784 strcpy(elf_platform, "z10"); 785 break; 786 } 787 } 788 789 /* 790 * Setup function called from init/main.c just after the banner 791 * was printed. 792 */ 793 794 void __init 795 setup_arch(char **cmdline_p) 796 { 797 /* 798 * print what head.S has found out about the machine 799 */ 800 #ifndef CONFIG_64BIT 801 if (MACHINE_IS_VM) 802 pr_info("Linux is running as a z/VM " 803 "guest operating system in 31-bit mode\n"); 804 else if (MACHINE_IS_LPAR) 805 pr_info("Linux is running natively in 31-bit mode\n"); 806 if (MACHINE_HAS_IEEE) 807 pr_info("The hardware system has IEEE compatible " 808 "floating point units\n"); 809 else 810 pr_info("The hardware system has no IEEE compatible " 811 "floating point units\n"); 812 #else /* CONFIG_64BIT */ 813 if (MACHINE_IS_VM) 814 pr_info("Linux is running as a z/VM " 815 "guest operating system in 64-bit mode\n"); 816 else if (MACHINE_IS_KVM) 817 pr_info("Linux is running under KVM in 64-bit mode\n"); 818 else if (MACHINE_IS_LPAR) 819 pr_info("Linux is running natively in 64-bit mode\n"); 820 #endif /* CONFIG_64BIT */ 821 822 /* Have one command line that is parsed and saved in /proc/cmdline */ 823 /* boot_command_line has been already set up in early.c */ 824 *cmdline_p = boot_command_line; 825 826 ROOT_DEV = Root_RAM0; 827 828 init_mm.start_code = PAGE_OFFSET; 829 init_mm.end_code = (unsigned long) &_etext; 830 init_mm.end_data = (unsigned long) &_edata; 831 init_mm.brk = (unsigned long) &_end; 832 833 if (MACHINE_HAS_MVCOS) 834 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 835 else 836 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 837 838 parse_early_param(); 839 840 setup_ipl(); 841 setup_memory_end(); 842 setup_addressing_mode(); 843 setup_memory(); 844 setup_resources(); 845 setup_lowcore(); 846 847 cpu_init(); 848 s390_init_cpu_topology(); 849 850 /* 851 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 852 */ 853 setup_hwcaps(); 854 855 /* 856 * Create kernel page tables and switch to virtual addressing. 857 */ 858 paging_init(); 859 860 /* Setup default console */ 861 conmode_default(); 862 set_preferred_console(); 863 864 /* Setup zfcpdump support */ 865 setup_zfcpdump(console_devno); 866 } 867