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 #include <linux/errno.h> 18 #include <linux/module.h> 19 #include <linux/sched.h> 20 #include <linux/kernel.h> 21 #include <linux/mm.h> 22 #include <linux/stddef.h> 23 #include <linux/unistd.h> 24 #include <linux/ptrace.h> 25 #include <linux/slab.h> 26 #include <linux/user.h> 27 #include <linux/tty.h> 28 #include <linux/ioport.h> 29 #include <linux/delay.h> 30 #include <linux/init.h> 31 #include <linux/initrd.h> 32 #include <linux/bootmem.h> 33 #include <linux/root_dev.h> 34 #include <linux/console.h> 35 #include <linux/seq_file.h> 36 #include <linux/kernel_stat.h> 37 #include <linux/device.h> 38 #include <linux/notifier.h> 39 #include <linux/pfn.h> 40 #include <linux/ctype.h> 41 #include <linux/reboot.h> 42 #include <linux/topology.h> 43 44 #include <asm/ipl.h> 45 #include <asm/uaccess.h> 46 #include <asm/system.h> 47 #include <asm/smp.h> 48 #include <asm/mmu_context.h> 49 #include <asm/cpcmd.h> 50 #include <asm/lowcore.h> 51 #include <asm/irq.h> 52 #include <asm/page.h> 53 #include <asm/ptrace.h> 54 #include <asm/sections.h> 55 #include <asm/ebcdic.h> 56 #include <asm/compat.h> 57 58 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY | 59 PSW_MASK_MCHECK | PSW_DEFAULT_KEY); 60 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 61 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 62 PSW_MASK_PSTATE | PSW_DEFAULT_KEY); 63 64 /* 65 * User copy operations. 66 */ 67 struct uaccess_ops uaccess; 68 EXPORT_SYMBOL(uaccess); 69 70 /* 71 * Machine setup.. 72 */ 73 unsigned int console_mode = 0; 74 unsigned int console_devno = -1; 75 unsigned int console_irq = -1; 76 unsigned long machine_flags = 0; 77 unsigned long elf_hwcap = 0; 78 char elf_platform[ELF_PLATFORM_SIZE]; 79 80 struct mem_chunk __meminitdata memory_chunk[MEMORY_CHUNKS]; 81 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ 82 static unsigned long __initdata memory_end; 83 84 /* 85 * This is set up by the setup-routine at boot-time 86 * for S390 need to find out, what we have to setup 87 * using address 0x10400 ... 88 */ 89 90 #include <asm/setup.h> 91 92 static struct resource code_resource = { 93 .name = "Kernel code", 94 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 95 }; 96 97 static struct resource data_resource = { 98 .name = "Kernel data", 99 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 100 }; 101 102 /* 103 * cpu_init() initializes state that is per-CPU. 104 */ 105 void __cpuinit cpu_init(void) 106 { 107 int addr = hard_smp_processor_id(); 108 109 /* 110 * Store processor id in lowcore (used e.g. in timer_interrupt) 111 */ 112 get_cpu_id(&S390_lowcore.cpu_data.cpu_id); 113 S390_lowcore.cpu_data.cpu_addr = addr; 114 115 /* 116 * Force FPU initialization: 117 */ 118 clear_thread_flag(TIF_USEDFPU); 119 clear_used_math(); 120 121 atomic_inc(&init_mm.mm_count); 122 current->active_mm = &init_mm; 123 if (current->mm) 124 BUG(); 125 enter_lazy_tlb(&init_mm, current); 126 } 127 128 /* 129 * condev= and conmode= setup parameter. 130 */ 131 132 static int __init condev_setup(char *str) 133 { 134 int vdev; 135 136 vdev = simple_strtoul(str, &str, 0); 137 if (vdev >= 0 && vdev < 65536) { 138 console_devno = vdev; 139 console_irq = -1; 140 } 141 return 1; 142 } 143 144 __setup("condev=", condev_setup); 145 146 static int __init conmode_setup(char *str) 147 { 148 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 149 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 150 SET_CONSOLE_SCLP; 151 #endif 152 #if defined(CONFIG_TN3215_CONSOLE) 153 if (strncmp(str, "3215", 5) == 0) 154 SET_CONSOLE_3215; 155 #endif 156 #if defined(CONFIG_TN3270_CONSOLE) 157 if (strncmp(str, "3270", 5) == 0) 158 SET_CONSOLE_3270; 159 #endif 160 return 1; 161 } 162 163 __setup("conmode=", conmode_setup); 164 165 static void __init conmode_default(void) 166 { 167 char query_buffer[1024]; 168 char *ptr; 169 170 if (MACHINE_IS_VM) { 171 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 172 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 173 ptr = strstr(query_buffer, "SUBCHANNEL ="); 174 console_irq = simple_strtoul(ptr + 13, NULL, 16); 175 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 176 ptr = strstr(query_buffer, "CONMODE"); 177 /* 178 * Set the conmode to 3215 so that the device recognition 179 * will set the cu_type of the console to 3215. If the 180 * conmode is 3270 and we don't set it back then both 181 * 3215 and the 3270 driver will try to access the console 182 * device (3215 as console and 3270 as normal tty). 183 */ 184 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 185 if (ptr == NULL) { 186 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 187 SET_CONSOLE_SCLP; 188 #endif 189 return; 190 } 191 if (strncmp(ptr + 8, "3270", 4) == 0) { 192 #if defined(CONFIG_TN3270_CONSOLE) 193 SET_CONSOLE_3270; 194 #elif defined(CONFIG_TN3215_CONSOLE) 195 SET_CONSOLE_3215; 196 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 197 SET_CONSOLE_SCLP; 198 #endif 199 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 200 #if defined(CONFIG_TN3215_CONSOLE) 201 SET_CONSOLE_3215; 202 #elif defined(CONFIG_TN3270_CONSOLE) 203 SET_CONSOLE_3270; 204 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 205 SET_CONSOLE_SCLP; 206 #endif 207 } 208 } else if (MACHINE_IS_P390) { 209 #if defined(CONFIG_TN3215_CONSOLE) 210 SET_CONSOLE_3215; 211 #elif defined(CONFIG_TN3270_CONSOLE) 212 SET_CONSOLE_3270; 213 #endif 214 } else { 215 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 216 SET_CONSOLE_SCLP; 217 #endif 218 } 219 } 220 221 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 222 static void __init setup_zfcpdump(unsigned int console_devno) 223 { 224 static char str[64]; 225 226 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 227 return; 228 if (console_devno != -1) 229 sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x", 230 ipl_info.data.fcp.dev_id.devno, console_devno); 231 else 232 sprintf(str, "cio_ignore=all,!0.0.%04x", 233 ipl_info.data.fcp.dev_id.devno); 234 strcat(COMMAND_LINE, " "); 235 strcat(COMMAND_LINE, str); 236 console_loglevel = 2; 237 } 238 #else 239 static inline void setup_zfcpdump(unsigned int console_devno) {} 240 #endif /* CONFIG_ZFCPDUMP */ 241 242 /* 243 * Reboot, halt and power_off stubs. They just call _machine_restart, 244 * _machine_halt or _machine_power_off. 245 */ 246 247 void machine_restart(char *command) 248 { 249 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 250 /* 251 * Only unblank the console if we are called in enabled 252 * context or a bust_spinlocks cleared the way for us. 253 */ 254 console_unblank(); 255 _machine_restart(command); 256 } 257 258 void machine_halt(void) 259 { 260 if (!in_interrupt() || oops_in_progress) 261 /* 262 * Only unblank the console if we are called in enabled 263 * context or a bust_spinlocks cleared the way for us. 264 */ 265 console_unblank(); 266 _machine_halt(); 267 } 268 269 void machine_power_off(void) 270 { 271 if (!in_interrupt() || oops_in_progress) 272 /* 273 * Only unblank the console if we are called in enabled 274 * context or a bust_spinlocks cleared the way for us. 275 */ 276 console_unblank(); 277 _machine_power_off(); 278 } 279 280 /* 281 * Dummy power off function. 282 */ 283 void (*pm_power_off)(void) = machine_power_off; 284 285 static int __init early_parse_mem(char *p) 286 { 287 memory_end = memparse(p, &p); 288 return 0; 289 } 290 early_param("mem", early_parse_mem); 291 292 /* 293 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes 294 */ 295 static int __init early_parse_ipldelay(char *p) 296 { 297 unsigned long delay = 0; 298 299 delay = simple_strtoul(p, &p, 0); 300 301 switch (*p) { 302 case 's': 303 case 'S': 304 delay *= 1000000; 305 break; 306 case 'm': 307 case 'M': 308 delay *= 60 * 1000000; 309 } 310 311 /* now wait for the requested amount of time */ 312 udelay(delay); 313 314 return 0; 315 } 316 early_param("ipldelay", early_parse_ipldelay); 317 318 #ifdef CONFIG_S390_SWITCH_AMODE 319 #ifdef CONFIG_PGSTE 320 unsigned int switch_amode = 1; 321 #else 322 unsigned int switch_amode = 0; 323 #endif 324 EXPORT_SYMBOL_GPL(switch_amode); 325 326 static void set_amode_and_uaccess(unsigned long user_amode, 327 unsigned long user32_amode) 328 { 329 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 330 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 331 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 332 #ifdef CONFIG_COMPAT 333 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 334 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 335 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 336 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 337 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 338 PSW32_MASK_PSTATE; 339 #endif 340 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 341 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 342 343 if (MACHINE_HAS_MVCOS) { 344 printk("mvcos available.\n"); 345 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 346 } else { 347 printk("mvcos not available.\n"); 348 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 349 } 350 } 351 352 /* 353 * Switch kernel/user addressing modes? 354 */ 355 static int __init early_parse_switch_amode(char *p) 356 { 357 switch_amode = 1; 358 return 0; 359 } 360 early_param("switch_amode", early_parse_switch_amode); 361 362 #else /* CONFIG_S390_SWITCH_AMODE */ 363 static inline void set_amode_and_uaccess(unsigned long user_amode, 364 unsigned long user32_amode) 365 { 366 } 367 #endif /* CONFIG_S390_SWITCH_AMODE */ 368 369 #ifdef CONFIG_S390_EXEC_PROTECT 370 unsigned int s390_noexec = 0; 371 EXPORT_SYMBOL_GPL(s390_noexec); 372 373 /* 374 * Enable execute protection? 375 */ 376 static int __init early_parse_noexec(char *p) 377 { 378 if (!strncmp(p, "off", 3)) 379 return 0; 380 switch_amode = 1; 381 s390_noexec = 1; 382 return 0; 383 } 384 early_param("noexec", early_parse_noexec); 385 #endif /* CONFIG_S390_EXEC_PROTECT */ 386 387 static void setup_addressing_mode(void) 388 { 389 if (s390_noexec) { 390 printk("S390 execute protection active, "); 391 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY); 392 } else if (switch_amode) { 393 printk("S390 address spaces switched, "); 394 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY); 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 (switch_amode) 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->ipl_device = S390_lowcore.ipl_device; 435 lc->clock_comparator = -1ULL; 436 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 437 lc->async_stack = (unsigned long) 438 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 439 lc->panic_stack = (unsigned long) 440 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 441 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 442 lc->thread_info = (unsigned long) &init_thread_union; 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 #endif 451 set_prefix((u32)(unsigned long) lc); 452 } 453 454 static void __init 455 setup_resources(void) 456 { 457 struct resource *res, *sub_res; 458 int i; 459 460 code_resource.start = (unsigned long) &_text; 461 code_resource.end = (unsigned long) &_etext - 1; 462 data_resource.start = (unsigned long) &_etext; 463 data_resource.end = (unsigned long) &_edata - 1; 464 465 for (i = 0; i < MEMORY_CHUNKS; i++) { 466 if (!memory_chunk[i].size) 467 continue; 468 res = alloc_bootmem_low(sizeof(struct resource)); 469 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 470 switch (memory_chunk[i].type) { 471 case CHUNK_READ_WRITE: 472 res->name = "System RAM"; 473 break; 474 case CHUNK_READ_ONLY: 475 res->name = "System ROM"; 476 res->flags |= IORESOURCE_READONLY; 477 break; 478 default: 479 res->name = "reserved"; 480 } 481 res->start = memory_chunk[i].addr; 482 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 483 request_resource(&iomem_resource, res); 484 485 if (code_resource.start >= res->start && 486 code_resource.start <= res->end && 487 code_resource.end > res->end) { 488 sub_res = alloc_bootmem_low(sizeof(struct resource)); 489 memcpy(sub_res, &code_resource, 490 sizeof(struct resource)); 491 sub_res->end = res->end; 492 code_resource.start = res->end + 1; 493 request_resource(res, sub_res); 494 } 495 496 if (code_resource.start >= res->start && 497 code_resource.start <= res->end && 498 code_resource.end <= res->end) 499 request_resource(res, &code_resource); 500 501 if (data_resource.start >= res->start && 502 data_resource.start <= res->end && 503 data_resource.end > res->end) { 504 sub_res = alloc_bootmem_low(sizeof(struct resource)); 505 memcpy(sub_res, &data_resource, 506 sizeof(struct resource)); 507 sub_res->end = res->end; 508 data_resource.start = res->end + 1; 509 request_resource(res, sub_res); 510 } 511 512 if (data_resource.start >= res->start && 513 data_resource.start <= res->end && 514 data_resource.end <= res->end) 515 request_resource(res, &data_resource); 516 } 517 } 518 519 unsigned long real_memory_size; 520 EXPORT_SYMBOL_GPL(real_memory_size); 521 522 static void __init setup_memory_end(void) 523 { 524 unsigned long memory_size; 525 unsigned long max_mem; 526 int i; 527 528 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 529 if (ipl_info.type == IPL_TYPE_FCP_DUMP) 530 memory_end = ZFCPDUMP_HSA_SIZE; 531 #endif 532 memory_size = 0; 533 memory_end &= PAGE_MASK; 534 535 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 536 memory_end = min(max_mem, memory_end); 537 538 /* 539 * Make sure all chunks are MAX_ORDER aligned so we don't need the 540 * extra checks that HOLES_IN_ZONE would require. 541 */ 542 for (i = 0; i < MEMORY_CHUNKS; i++) { 543 unsigned long start, end; 544 struct mem_chunk *chunk; 545 unsigned long align; 546 547 chunk = &memory_chunk[i]; 548 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 549 start = (chunk->addr + align - 1) & ~(align - 1); 550 end = (chunk->addr + chunk->size) & ~(align - 1); 551 if (start >= end) 552 memset(chunk, 0, sizeof(*chunk)); 553 else { 554 chunk->addr = start; 555 chunk->size = end - start; 556 } 557 } 558 559 for (i = 0; i < MEMORY_CHUNKS; i++) { 560 struct mem_chunk *chunk = &memory_chunk[i]; 561 562 real_memory_size = max(real_memory_size, 563 chunk->addr + chunk->size); 564 if (chunk->addr >= max_mem) { 565 memset(chunk, 0, sizeof(*chunk)); 566 continue; 567 } 568 if (chunk->addr + chunk->size > max_mem) 569 chunk->size = max_mem - chunk->addr; 570 memory_size = max(memory_size, chunk->addr + chunk->size); 571 } 572 if (!memory_end) 573 memory_end = memory_size; 574 } 575 576 static void __init 577 setup_memory(void) 578 { 579 unsigned long bootmap_size; 580 unsigned long start_pfn, end_pfn; 581 int i; 582 583 /* 584 * partially used pages are not usable - thus 585 * we are rounding upwards: 586 */ 587 start_pfn = PFN_UP(__pa(&_end)); 588 end_pfn = max_pfn = PFN_DOWN(memory_end); 589 590 #ifdef CONFIG_BLK_DEV_INITRD 591 /* 592 * Move the initrd in case the bitmap of the bootmem allocater 593 * would overwrite it. 594 */ 595 596 if (INITRD_START && INITRD_SIZE) { 597 unsigned long bmap_size; 598 unsigned long start; 599 600 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 601 bmap_size = PFN_PHYS(bmap_size); 602 603 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 604 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 605 606 if (start + INITRD_SIZE > memory_end) { 607 printk("initrd extends beyond end of memory " 608 "(0x%08lx > 0x%08lx)\n" 609 "disabling initrd\n", 610 start + INITRD_SIZE, memory_end); 611 INITRD_START = INITRD_SIZE = 0; 612 } else { 613 printk("Moving initrd (0x%08lx -> 0x%08lx, " 614 "size: %ld)\n", 615 INITRD_START, start, INITRD_SIZE); 616 memmove((void *) start, (void *) INITRD_START, 617 INITRD_SIZE); 618 INITRD_START = start; 619 } 620 } 621 } 622 #endif 623 624 /* 625 * Initialize the boot-time allocator 626 */ 627 bootmap_size = init_bootmem(start_pfn, end_pfn); 628 629 /* 630 * Register RAM areas with the bootmem allocator. 631 */ 632 633 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 634 unsigned long start_chunk, end_chunk, pfn; 635 636 if (memory_chunk[i].type != CHUNK_READ_WRITE) 637 continue; 638 start_chunk = PFN_DOWN(memory_chunk[i].addr); 639 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1; 640 end_chunk = min(end_chunk, end_pfn); 641 if (start_chunk >= end_chunk) 642 continue; 643 add_active_range(0, start_chunk, end_chunk); 644 pfn = max(start_chunk, start_pfn); 645 for (; pfn <= end_chunk; pfn++) 646 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 647 } 648 649 psw_set_key(PAGE_DEFAULT_KEY); 650 651 free_bootmem_with_active_regions(0, max_pfn); 652 653 /* 654 * Reserve memory used for lowcore/command line/kernel image. 655 */ 656 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 657 reserve_bootmem((unsigned long)_stext, 658 PFN_PHYS(start_pfn) - (unsigned long)_stext, 659 BOOTMEM_DEFAULT); 660 /* 661 * Reserve the bootmem bitmap itself as well. We do this in two 662 * steps (first step was init_bootmem()) because this catches 663 * the (very unlikely) case of us accidentally initializing the 664 * bootmem allocator with an invalid RAM area. 665 */ 666 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 667 BOOTMEM_DEFAULT); 668 669 #ifdef CONFIG_BLK_DEV_INITRD 670 if (INITRD_START && INITRD_SIZE) { 671 if (INITRD_START + INITRD_SIZE <= memory_end) { 672 reserve_bootmem(INITRD_START, INITRD_SIZE, 673 BOOTMEM_DEFAULT); 674 initrd_start = INITRD_START; 675 initrd_end = initrd_start + INITRD_SIZE; 676 } else { 677 printk("initrd extends beyond end of memory " 678 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 679 initrd_start + INITRD_SIZE, memory_end); 680 initrd_start = initrd_end = 0; 681 } 682 } 683 #endif 684 } 685 686 static __init unsigned int stfl(void) 687 { 688 asm volatile( 689 " .insn s,0xb2b10000,0(0)\n" /* stfl */ 690 "0:\n" 691 EX_TABLE(0b,0b)); 692 return S390_lowcore.stfl_fac_list; 693 } 694 695 static int __init __stfle(unsigned long long *list, int doublewords) 696 { 697 typedef struct { unsigned long long _[doublewords]; } addrtype; 698 register unsigned long __nr asm("0") = doublewords - 1; 699 700 asm volatile(".insn s,0xb2b00000,%0" /* stfle */ 701 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc"); 702 return __nr + 1; 703 } 704 705 int __init stfle(unsigned long long *list, int doublewords) 706 { 707 if (!(stfl() & (1UL << 24))) 708 return -EOPNOTSUPP; 709 return __stfle(list, doublewords); 710 } 711 712 /* 713 * Setup hardware capabilities. 714 */ 715 static void __init setup_hwcaps(void) 716 { 717 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 718 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; 719 unsigned long long facility_list_extended; 720 unsigned int facility_list; 721 int i; 722 723 facility_list = stfl(); 724 /* 725 * The store facility list bits numbers as found in the principles 726 * of operation are numbered with bit 1UL<<31 as number 0 to 727 * bit 1UL<<0 as number 31. 728 * Bit 0: instructions named N3, "backported" to esa-mode 729 * Bit 2: z/Architecture mode is active 730 * Bit 7: the store-facility-list-extended facility is installed 731 * Bit 17: the message-security assist is installed 732 * Bit 19: the long-displacement facility is installed 733 * Bit 21: the extended-immediate facility is installed 734 * These get translated to: 735 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 736 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 737 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5. 738 */ 739 for (i = 0; i < 6; i++) 740 if (facility_list & (1UL << (31 - stfl_bits[i]))) 741 elf_hwcap |= 1UL << i; 742 743 /* 744 * Check for additional facilities with store-facility-list-extended. 745 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 746 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 747 * as stored by stfl, bits 32-xxx contain additional facilities. 748 * How many facility words are stored depends on the number of 749 * doublewords passed to the instruction. The additional facilites 750 * are: 751 * Bit 43: decimal floating point facility is installed 752 * translated to: 753 * HWCAP_S390_DFP bit 6. 754 */ 755 if ((elf_hwcap & (1UL << 2)) && 756 __stfle(&facility_list_extended, 1) > 0) { 757 if (facility_list_extended & (1ULL << (64 - 43))) 758 elf_hwcap |= 1UL << 6; 759 } 760 761 switch (cpuinfo->cpu_id.machine) { 762 case 0x9672: 763 #if !defined(CONFIG_64BIT) 764 default: /* Use "g5" as default for 31 bit kernels. */ 765 #endif 766 strcpy(elf_platform, "g5"); 767 break; 768 case 0x2064: 769 case 0x2066: 770 #if defined(CONFIG_64BIT) 771 default: /* Use "z900" as default for 64 bit kernels. */ 772 #endif 773 strcpy(elf_platform, "z900"); 774 break; 775 case 0x2084: 776 case 0x2086: 777 strcpy(elf_platform, "z990"); 778 break; 779 case 0x2094: 780 strcpy(elf_platform, "z9-109"); 781 break; 782 } 783 } 784 785 /* 786 * Setup function called from init/main.c just after the banner 787 * was printed. 788 */ 789 790 void __init 791 setup_arch(char **cmdline_p) 792 { 793 /* 794 * print what head.S has found out about the machine 795 */ 796 #ifndef CONFIG_64BIT 797 printk((MACHINE_IS_VM) ? 798 "We are running under VM (31 bit mode)\n" : 799 "We are running native (31 bit mode)\n"); 800 printk((MACHINE_HAS_IEEE) ? 801 "This machine has an IEEE fpu\n" : 802 "This machine has no IEEE fpu\n"); 803 #else /* CONFIG_64BIT */ 804 if (MACHINE_IS_VM) 805 printk("We are running under VM (64 bit mode)\n"); 806 else if (MACHINE_IS_KVM) { 807 printk("We are running under KVM (64 bit mode)\n"); 808 add_preferred_console("ttyS", 1, NULL); 809 } else 810 printk("We are running native (64 bit mode)\n"); 811 #endif /* CONFIG_64BIT */ 812 813 /* Save unparsed command line copy for /proc/cmdline */ 814 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 815 816 *cmdline_p = COMMAND_LINE; 817 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0'; 818 819 ROOT_DEV = Root_RAM0; 820 821 init_mm.start_code = PAGE_OFFSET; 822 init_mm.end_code = (unsigned long) &_etext; 823 init_mm.end_data = (unsigned long) &_edata; 824 init_mm.brk = (unsigned long) &_end; 825 826 if (MACHINE_HAS_MVCOS) 827 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 828 else 829 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 830 831 parse_early_param(); 832 833 setup_ipl(); 834 setup_memory_end(); 835 setup_addressing_mode(); 836 setup_memory(); 837 setup_resources(); 838 setup_lowcore(); 839 840 cpu_init(); 841 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 842 s390_init_cpu_topology(); 843 844 /* 845 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 846 */ 847 setup_hwcaps(); 848 849 /* 850 * Create kernel page tables and switch to virtual addressing. 851 */ 852 paging_init(); 853 854 /* Setup default console */ 855 conmode_default(); 856 857 /* Setup zfcpdump support */ 858 setup_zfcpdump(console_devno); 859 } 860 861 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo) 862 { 863 printk(KERN_INFO "cpu %d " 864 #ifdef CONFIG_SMP 865 "phys_idx=%d " 866 #endif 867 "vers=%02X ident=%06X machine=%04X unused=%04X\n", 868 cpuinfo->cpu_nr, 869 #ifdef CONFIG_SMP 870 cpuinfo->cpu_addr, 871 #endif 872 cpuinfo->cpu_id.version, 873 cpuinfo->cpu_id.ident, 874 cpuinfo->cpu_id.machine, 875 cpuinfo->cpu_id.unused); 876 } 877 878 /* 879 * show_cpuinfo - Get information on one CPU for use by procfs. 880 */ 881 882 static int show_cpuinfo(struct seq_file *m, void *v) 883 { 884 static const char *hwcap_str[7] = { 885 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp" 886 }; 887 struct cpuinfo_S390 *cpuinfo; 888 unsigned long n = (unsigned long) v - 1; 889 int i; 890 891 s390_adjust_jiffies(); 892 preempt_disable(); 893 if (!n) { 894 seq_printf(m, "vendor_id : IBM/S390\n" 895 "# processors : %i\n" 896 "bogomips per cpu: %lu.%02lu\n", 897 num_online_cpus(), loops_per_jiffy/(500000/HZ), 898 (loops_per_jiffy/(5000/HZ))%100); 899 seq_puts(m, "features\t: "); 900 for (i = 0; i < 7; i++) 901 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 902 seq_printf(m, "%s ", hwcap_str[i]); 903 seq_puts(m, "\n"); 904 } 905 906 if (cpu_online(n)) { 907 #ifdef CONFIG_SMP 908 if (smp_processor_id() == n) 909 cpuinfo = &S390_lowcore.cpu_data; 910 else 911 cpuinfo = &lowcore_ptr[n]->cpu_data; 912 #else 913 cpuinfo = &S390_lowcore.cpu_data; 914 #endif 915 seq_printf(m, "processor %li: " 916 "version = %02X, " 917 "identification = %06X, " 918 "machine = %04X\n", 919 n, cpuinfo->cpu_id.version, 920 cpuinfo->cpu_id.ident, 921 cpuinfo->cpu_id.machine); 922 } 923 preempt_enable(); 924 return 0; 925 } 926 927 static void *c_start(struct seq_file *m, loff_t *pos) 928 { 929 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; 930 } 931 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 932 { 933 ++*pos; 934 return c_start(m, pos); 935 } 936 static void c_stop(struct seq_file *m, void *v) 937 { 938 } 939 const struct seq_operations cpuinfo_op = { 940 .start = c_start, 941 .next = c_next, 942 .stop = c_stop, 943 .show = show_cpuinfo, 944 }; 945 946