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 void __init set_preferred_console(void) 158 { 159 if (MACHINE_IS_KVM) 160 add_preferred_console("hvc", 0, NULL); 161 else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 162 add_preferred_console("ttyS", 0, NULL); 163 else if (CONSOLE_IS_3270) 164 add_preferred_console("tty3270", 0, NULL); 165 } 166 167 static int __init conmode_setup(char *str) 168 { 169 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 170 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 171 SET_CONSOLE_SCLP; 172 #endif 173 #if defined(CONFIG_TN3215_CONSOLE) 174 if (strncmp(str, "3215", 5) == 0) 175 SET_CONSOLE_3215; 176 #endif 177 #if defined(CONFIG_TN3270_CONSOLE) 178 if (strncmp(str, "3270", 5) == 0) 179 SET_CONSOLE_3270; 180 #endif 181 set_preferred_console(); 182 return 1; 183 } 184 185 __setup("conmode=", conmode_setup); 186 187 static void __init conmode_default(void) 188 { 189 char query_buffer[1024]; 190 char *ptr; 191 192 if (MACHINE_IS_VM) { 193 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 194 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 195 ptr = strstr(query_buffer, "SUBCHANNEL ="); 196 console_irq = simple_strtoul(ptr + 13, NULL, 16); 197 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 198 ptr = strstr(query_buffer, "CONMODE"); 199 /* 200 * Set the conmode to 3215 so that the device recognition 201 * will set the cu_type of the console to 3215. If the 202 * conmode is 3270 and we don't set it back then both 203 * 3215 and the 3270 driver will try to access the console 204 * device (3215 as console and 3270 as normal tty). 205 */ 206 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 207 if (ptr == NULL) { 208 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 209 SET_CONSOLE_SCLP; 210 #endif 211 return; 212 } 213 if (strncmp(ptr + 8, "3270", 4) == 0) { 214 #if defined(CONFIG_TN3270_CONSOLE) 215 SET_CONSOLE_3270; 216 #elif defined(CONFIG_TN3215_CONSOLE) 217 SET_CONSOLE_3215; 218 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 219 SET_CONSOLE_SCLP; 220 #endif 221 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 222 #if defined(CONFIG_TN3215_CONSOLE) 223 SET_CONSOLE_3215; 224 #elif defined(CONFIG_TN3270_CONSOLE) 225 SET_CONSOLE_3270; 226 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 227 SET_CONSOLE_SCLP; 228 #endif 229 } 230 } else { 231 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 232 SET_CONSOLE_SCLP; 233 #endif 234 } 235 } 236 237 #ifdef CONFIG_ZFCPDUMP 238 static void __init setup_zfcpdump(unsigned int console_devno) 239 { 240 static char str[41]; 241 242 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 243 return; 244 if (console_devno != -1) 245 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 246 ipl_info.data.fcp.dev_id.devno, console_devno); 247 else 248 sprintf(str, " cio_ignore=all,!0.0.%04x", 249 ipl_info.data.fcp.dev_id.devno); 250 strcat(boot_command_line, str); 251 console_loglevel = 2; 252 } 253 #else 254 static inline void setup_zfcpdump(unsigned int console_devno) {} 255 #endif /* CONFIG_ZFCPDUMP */ 256 257 /* 258 * Reboot, halt and power_off stubs. They just call _machine_restart, 259 * _machine_halt or _machine_power_off. 260 */ 261 262 void machine_restart(char *command) 263 { 264 if ((!in_interrupt() && !in_atomic()) || 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_restart(command); 271 } 272 273 void machine_halt(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_halt(); 282 } 283 284 void machine_power_off(void) 285 { 286 if (!in_interrupt() || oops_in_progress) 287 /* 288 * Only unblank the console if we are called in enabled 289 * context or a bust_spinlocks cleared the way for us. 290 */ 291 console_unblank(); 292 _machine_power_off(); 293 } 294 295 /* 296 * Dummy power off function. 297 */ 298 void (*pm_power_off)(void) = machine_power_off; 299 300 static int __init early_parse_mem(char *p) 301 { 302 memory_end = memparse(p, &p); 303 memory_end_set = 1; 304 return 0; 305 } 306 early_param("mem", early_parse_mem); 307 308 unsigned int user_mode = HOME_SPACE_MODE; 309 EXPORT_SYMBOL_GPL(user_mode); 310 311 static int set_amode_and_uaccess(unsigned long user_amode, 312 unsigned long user32_amode) 313 { 314 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 315 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 316 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 317 #ifdef CONFIG_COMPAT 318 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 319 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 320 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 321 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 322 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 323 PSW32_MASK_PSTATE; 324 #endif 325 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 326 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 327 328 if (MACHINE_HAS_MVCOS) { 329 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 330 return 1; 331 } else { 332 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 333 return 0; 334 } 335 } 336 337 /* 338 * Switch kernel/user addressing modes? 339 */ 340 static int __init early_parse_switch_amode(char *p) 341 { 342 if (user_mode != SECONDARY_SPACE_MODE) 343 user_mode = PRIMARY_SPACE_MODE; 344 return 0; 345 } 346 early_param("switch_amode", early_parse_switch_amode); 347 348 static int __init early_parse_user_mode(char *p) 349 { 350 if (p && strcmp(p, "primary") == 0) 351 user_mode = PRIMARY_SPACE_MODE; 352 #ifdef CONFIG_S390_EXEC_PROTECT 353 else if (p && strcmp(p, "secondary") == 0) 354 user_mode = SECONDARY_SPACE_MODE; 355 #endif 356 else if (!p || strcmp(p, "home") == 0) 357 user_mode = HOME_SPACE_MODE; 358 else 359 return 1; 360 return 0; 361 } 362 early_param("user_mode", early_parse_user_mode); 363 364 #ifdef CONFIG_S390_EXEC_PROTECT 365 /* 366 * Enable execute protection? 367 */ 368 static int __init early_parse_noexec(char *p) 369 { 370 if (!strncmp(p, "off", 3)) 371 return 0; 372 user_mode = SECONDARY_SPACE_MODE; 373 return 0; 374 } 375 early_param("noexec", early_parse_noexec); 376 #endif /* CONFIG_S390_EXEC_PROTECT */ 377 378 static void setup_addressing_mode(void) 379 { 380 if (user_mode == SECONDARY_SPACE_MODE) { 381 if (set_amode_and_uaccess(PSW_ASC_SECONDARY, 382 PSW32_ASC_SECONDARY)) 383 pr_info("Execute protection active, " 384 "mvcos available\n"); 385 else 386 pr_info("Execute protection active, " 387 "mvcos not available\n"); 388 } else if (user_mode == PRIMARY_SPACE_MODE) { 389 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY)) 390 pr_info("Address spaces switched, " 391 "mvcos available\n"); 392 else 393 pr_info("Address spaces switched, " 394 "mvcos not available\n"); 395 } 396 #ifdef CONFIG_TRACE_IRQFLAGS 397 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 398 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 399 #endif 400 } 401 402 static void __init 403 setup_lowcore(void) 404 { 405 struct _lowcore *lc; 406 int lc_pages; 407 408 /* 409 * Setup lowcore for boot cpu 410 */ 411 lc_pages = sizeof(void *) == 8 ? 2 : 1; 412 lc = (struct _lowcore *) 413 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 414 memset(lc, 0, lc_pages * PAGE_SIZE); 415 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 416 lc->restart_psw.addr = 417 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 418 if (user_mode != HOME_SPACE_MODE) 419 lc->restart_psw.mask |= PSW_ASC_HOME; 420 lc->external_new_psw.mask = psw_kernel_bits; 421 lc->external_new_psw.addr = 422 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 423 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 424 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 425 lc->program_new_psw.mask = psw_kernel_bits; 426 lc->program_new_psw.addr = 427 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 428 lc->mcck_new_psw.mask = 429 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 430 lc->mcck_new_psw.addr = 431 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 432 lc->io_new_psw.mask = psw_kernel_bits; 433 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 434 lc->clock_comparator = -1ULL; 435 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 436 lc->async_stack = (unsigned long) 437 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 438 lc->panic_stack = (unsigned long) 439 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 440 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 441 lc->thread_info = (unsigned long) &init_thread_union; 442 lc->machine_flags = S390_lowcore.machine_flags; 443 #ifndef CONFIG_64BIT 444 if (MACHINE_HAS_IEEE) { 445 lc->extended_save_area_addr = (__u32) 446 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 447 /* enable extended save area */ 448 __ctl_set_bit(14, 29); 449 } 450 #else 451 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 452 #endif 453 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 454 lc->async_enter_timer = S390_lowcore.async_enter_timer; 455 lc->exit_timer = S390_lowcore.exit_timer; 456 lc->user_timer = S390_lowcore.user_timer; 457 lc->system_timer = S390_lowcore.system_timer; 458 lc->steal_timer = S390_lowcore.steal_timer; 459 lc->last_update_timer = S390_lowcore.last_update_timer; 460 lc->last_update_clock = S390_lowcore.last_update_clock; 461 lc->ftrace_func = S390_lowcore.ftrace_func; 462 set_prefix((u32)(unsigned long) lc); 463 lowcore_ptr[0] = lc; 464 } 465 466 static void __init 467 setup_resources(void) 468 { 469 struct resource *res, *sub_res; 470 int i; 471 472 code_resource.start = (unsigned long) &_text; 473 code_resource.end = (unsigned long) &_etext - 1; 474 data_resource.start = (unsigned long) &_etext; 475 data_resource.end = (unsigned long) &_edata - 1; 476 477 for (i = 0; i < MEMORY_CHUNKS; i++) { 478 if (!memory_chunk[i].size) 479 continue; 480 res = alloc_bootmem_low(sizeof(struct resource)); 481 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 482 switch (memory_chunk[i].type) { 483 case CHUNK_READ_WRITE: 484 res->name = "System RAM"; 485 break; 486 case CHUNK_READ_ONLY: 487 res->name = "System ROM"; 488 res->flags |= IORESOURCE_READONLY; 489 break; 490 default: 491 res->name = "reserved"; 492 } 493 res->start = memory_chunk[i].addr; 494 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 495 request_resource(&iomem_resource, res); 496 497 if (code_resource.start >= res->start && 498 code_resource.start <= res->end && 499 code_resource.end > res->end) { 500 sub_res = alloc_bootmem_low(sizeof(struct resource)); 501 memcpy(sub_res, &code_resource, 502 sizeof(struct resource)); 503 sub_res->end = res->end; 504 code_resource.start = res->end + 1; 505 request_resource(res, sub_res); 506 } 507 508 if (code_resource.start >= res->start && 509 code_resource.start <= res->end && 510 code_resource.end <= res->end) 511 request_resource(res, &code_resource); 512 513 if (data_resource.start >= res->start && 514 data_resource.start <= res->end && 515 data_resource.end > res->end) { 516 sub_res = alloc_bootmem_low(sizeof(struct resource)); 517 memcpy(sub_res, &data_resource, 518 sizeof(struct resource)); 519 sub_res->end = res->end; 520 data_resource.start = res->end + 1; 521 request_resource(res, sub_res); 522 } 523 524 if (data_resource.start >= res->start && 525 data_resource.start <= res->end && 526 data_resource.end <= res->end) 527 request_resource(res, &data_resource); 528 } 529 } 530 531 unsigned long real_memory_size; 532 EXPORT_SYMBOL_GPL(real_memory_size); 533 534 static void __init setup_memory_end(void) 535 { 536 unsigned long memory_size; 537 unsigned long max_mem; 538 int i; 539 540 #ifdef CONFIG_ZFCPDUMP 541 if (ipl_info.type == IPL_TYPE_FCP_DUMP) { 542 memory_end = ZFCPDUMP_HSA_SIZE; 543 memory_end_set = 1; 544 } 545 #endif 546 memory_size = 0; 547 memory_end &= PAGE_MASK; 548 549 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 550 memory_end = min(max_mem, memory_end); 551 552 /* 553 * Make sure all chunks are MAX_ORDER aligned so we don't need the 554 * extra checks that HOLES_IN_ZONE would require. 555 */ 556 for (i = 0; i < MEMORY_CHUNKS; i++) { 557 unsigned long start, end; 558 struct mem_chunk *chunk; 559 unsigned long align; 560 561 chunk = &memory_chunk[i]; 562 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 563 start = (chunk->addr + align - 1) & ~(align - 1); 564 end = (chunk->addr + chunk->size) & ~(align - 1); 565 if (start >= end) 566 memset(chunk, 0, sizeof(*chunk)); 567 else { 568 chunk->addr = start; 569 chunk->size = end - start; 570 } 571 } 572 573 for (i = 0; i < MEMORY_CHUNKS; i++) { 574 struct mem_chunk *chunk = &memory_chunk[i]; 575 576 real_memory_size = max(real_memory_size, 577 chunk->addr + chunk->size); 578 if (chunk->addr >= max_mem) { 579 memset(chunk, 0, sizeof(*chunk)); 580 continue; 581 } 582 if (chunk->addr + chunk->size > max_mem) 583 chunk->size = max_mem - chunk->addr; 584 memory_size = max(memory_size, chunk->addr + chunk->size); 585 } 586 if (!memory_end) 587 memory_end = memory_size; 588 } 589 590 static void __init 591 setup_memory(void) 592 { 593 unsigned long bootmap_size; 594 unsigned long start_pfn, end_pfn; 595 int i; 596 597 /* 598 * partially used pages are not usable - thus 599 * we are rounding upwards: 600 */ 601 start_pfn = PFN_UP(__pa(&_end)); 602 end_pfn = max_pfn = PFN_DOWN(memory_end); 603 604 #ifdef CONFIG_BLK_DEV_INITRD 605 /* 606 * Move the initrd in case the bitmap of the bootmem allocater 607 * would overwrite it. 608 */ 609 610 if (INITRD_START && INITRD_SIZE) { 611 unsigned long bmap_size; 612 unsigned long start; 613 614 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 615 bmap_size = PFN_PHYS(bmap_size); 616 617 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 618 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 619 620 if (start + INITRD_SIZE > memory_end) { 621 pr_err("initrd extends beyond end of " 622 "memory (0x%08lx > 0x%08lx) " 623 "disabling initrd\n", 624 start + INITRD_SIZE, memory_end); 625 INITRD_START = INITRD_SIZE = 0; 626 } else { 627 pr_info("Moving initrd (0x%08lx -> " 628 "0x%08lx, size: %ld)\n", 629 INITRD_START, start, INITRD_SIZE); 630 memmove((void *) start, (void *) INITRD_START, 631 INITRD_SIZE); 632 INITRD_START = start; 633 } 634 } 635 } 636 #endif 637 638 /* 639 * Initialize the boot-time allocator 640 */ 641 bootmap_size = init_bootmem(start_pfn, end_pfn); 642 643 /* 644 * Register RAM areas with the bootmem allocator. 645 */ 646 647 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 648 unsigned long start_chunk, end_chunk, pfn; 649 650 if (memory_chunk[i].type != CHUNK_READ_WRITE) 651 continue; 652 start_chunk = PFN_DOWN(memory_chunk[i].addr); 653 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 654 end_chunk = min(end_chunk, end_pfn); 655 if (start_chunk >= end_chunk) 656 continue; 657 add_active_range(0, start_chunk, end_chunk); 658 pfn = max(start_chunk, start_pfn); 659 for (; pfn < end_chunk; pfn++) 660 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 661 } 662 663 psw_set_key(PAGE_DEFAULT_KEY); 664 665 free_bootmem_with_active_regions(0, max_pfn); 666 667 /* 668 * Reserve memory used for lowcore/command line/kernel image. 669 */ 670 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 671 reserve_bootmem((unsigned long)_stext, 672 PFN_PHYS(start_pfn) - (unsigned long)_stext, 673 BOOTMEM_DEFAULT); 674 /* 675 * Reserve the bootmem bitmap itself as well. We do this in two 676 * steps (first step was init_bootmem()) because this catches 677 * the (very unlikely) case of us accidentally initializing the 678 * bootmem allocator with an invalid RAM area. 679 */ 680 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 681 BOOTMEM_DEFAULT); 682 683 #ifdef CONFIG_BLK_DEV_INITRD 684 if (INITRD_START && INITRD_SIZE) { 685 if (INITRD_START + INITRD_SIZE <= memory_end) { 686 reserve_bootmem(INITRD_START, INITRD_SIZE, 687 BOOTMEM_DEFAULT); 688 initrd_start = INITRD_START; 689 initrd_end = initrd_start + INITRD_SIZE; 690 } else { 691 pr_err("initrd extends beyond end of " 692 "memory (0x%08lx > 0x%08lx) " 693 "disabling initrd\n", 694 initrd_start + INITRD_SIZE, memory_end); 695 initrd_start = initrd_end = 0; 696 } 697 } 698 #endif 699 } 700 701 /* 702 * Setup hardware capabilities. 703 */ 704 static void __init setup_hwcaps(void) 705 { 706 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 707 unsigned long long facility_list_extended; 708 unsigned int facility_list; 709 int i; 710 711 facility_list = stfl(); 712 /* 713 * The store facility list bits numbers as found in the principles 714 * of operation are numbered with bit 1UL<<31 as number 0 to 715 * bit 1UL<<0 as number 31. 716 * Bit 0: instructions named N3, "backported" to esa-mode 717 * Bit 2: z/Architecture mode is active 718 * Bit 7: the store-facility-list-extended facility is installed 719 * Bit 17: the message-security assist is installed 720 * Bit 19: the long-displacement facility is installed 721 * Bit 21: the extended-immediate facility is installed 722 * Bit 22: extended-translation facility 3 is installed 723 * Bit 30: extended-translation facility 3 enhancement facility 724 * These get translated to: 725 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 726 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 727 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 728 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 729 */ 730 for (i = 0; i < 6; i++) 731 if (facility_list & (1UL << (31 - stfl_bits[i]))) 732 elf_hwcap |= 1UL << i; 733 734 if ((facility_list & (1UL << (31 - 22))) 735 && (facility_list & (1UL << (31 - 30)))) 736 elf_hwcap |= HWCAP_S390_ETF3EH; 737 738 /* 739 * Check for additional facilities with store-facility-list-extended. 740 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 741 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 742 * as stored by stfl, bits 32-xxx contain additional facilities. 743 * How many facility words are stored depends on the number of 744 * doublewords passed to the instruction. The additional facilites 745 * are: 746 * Bit 42: decimal floating point facility is installed 747 * Bit 44: perform floating point operation facility is installed 748 * translated to: 749 * HWCAP_S390_DFP bit 6 (42 && 44). 750 */ 751 if ((elf_hwcap & (1UL << 2)) && 752 __stfle(&facility_list_extended, 1) > 0) { 753 if ((facility_list_extended & (1ULL << (63 - 42))) 754 && (facility_list_extended & (1ULL << (63 - 44)))) 755 elf_hwcap |= HWCAP_S390_DFP; 756 } 757 758 /* 759 * Huge page support HWCAP_S390_HPAGE is bit 7. 760 */ 761 if (MACHINE_HAS_HPAGE) 762 elf_hwcap |= HWCAP_S390_HPAGE; 763 764 /* 765 * 64-bit register support for 31-bit processes 766 * HWCAP_S390_HIGH_GPRS is bit 9. 767 */ 768 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 769 770 switch (S390_lowcore.cpu_id.machine) { 771 case 0x9672: 772 #if !defined(CONFIG_64BIT) 773 default: /* Use "g5" as default for 31 bit kernels. */ 774 #endif 775 strcpy(elf_platform, "g5"); 776 break; 777 case 0x2064: 778 case 0x2066: 779 #if defined(CONFIG_64BIT) 780 default: /* Use "z900" as default for 64 bit kernels. */ 781 #endif 782 strcpy(elf_platform, "z900"); 783 break; 784 case 0x2084: 785 case 0x2086: 786 strcpy(elf_platform, "z990"); 787 break; 788 case 0x2094: 789 case 0x2096: 790 strcpy(elf_platform, "z9-109"); 791 break; 792 case 0x2097: 793 case 0x2098: 794 strcpy(elf_platform, "z10"); 795 break; 796 } 797 } 798 799 /* 800 * Setup function called from init/main.c just after the banner 801 * was printed. 802 */ 803 804 void __init 805 setup_arch(char **cmdline_p) 806 { 807 /* 808 * print what head.S has found out about the machine 809 */ 810 #ifndef CONFIG_64BIT 811 if (MACHINE_IS_VM) 812 pr_info("Linux is running as a z/VM " 813 "guest operating system in 31-bit mode\n"); 814 else 815 pr_info("Linux is running natively in 31-bit mode\n"); 816 if (MACHINE_HAS_IEEE) 817 pr_info("The hardware system has IEEE compatible " 818 "floating point units\n"); 819 else 820 pr_info("The hardware system has no IEEE compatible " 821 "floating point units\n"); 822 #else /* CONFIG_64BIT */ 823 if (MACHINE_IS_VM) 824 pr_info("Linux is running as a z/VM " 825 "guest operating system in 64-bit mode\n"); 826 else if (MACHINE_IS_KVM) 827 pr_info("Linux is running under KVM in 64-bit mode\n"); 828 else 829 pr_info("Linux is running natively in 64-bit mode\n"); 830 #endif /* CONFIG_64BIT */ 831 832 /* Have one command line that is parsed and saved in /proc/cmdline */ 833 /* boot_command_line has been already set up in early.c */ 834 *cmdline_p = boot_command_line; 835 836 ROOT_DEV = Root_RAM0; 837 838 init_mm.start_code = PAGE_OFFSET; 839 init_mm.end_code = (unsigned long) &_etext; 840 init_mm.end_data = (unsigned long) &_edata; 841 init_mm.brk = (unsigned long) &_end; 842 843 if (MACHINE_HAS_MVCOS) 844 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 845 else 846 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 847 848 parse_early_param(); 849 850 setup_ipl(); 851 setup_memory_end(); 852 setup_addressing_mode(); 853 setup_memory(); 854 setup_resources(); 855 setup_lowcore(); 856 857 cpu_init(); 858 __cpu_logical_map[0] = stap(); 859 s390_init_cpu_topology(); 860 861 /* 862 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 863 */ 864 setup_hwcaps(); 865 866 /* 867 * Create kernel page tables and switch to virtual addressing. 868 */ 869 paging_init(); 870 871 /* Setup default console */ 872 conmode_default(); 873 set_preferred_console(); 874 875 /* Setup zfcpdump support */ 876 setup_zfcpdump(console_devno); 877 } 878