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/a.out.h> 28 #include <linux/tty.h> 29 #include <linux/ioport.h> 30 #include <linux/delay.h> 31 #include <linux/init.h> 32 #include <linux/initrd.h> 33 #include <linux/bootmem.h> 34 #include <linux/root_dev.h> 35 #include <linux/console.h> 36 #include <linux/seq_file.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 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 __initdata 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) 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) 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) 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) 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) 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 unsigned int switch_amode = 0; 320 EXPORT_SYMBOL_GPL(switch_amode); 321 322 static void set_amode_and_uaccess(unsigned long user_amode, 323 unsigned long user32_amode) 324 { 325 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 326 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 327 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 328 #ifdef CONFIG_COMPAT 329 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 330 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 331 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 332 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 333 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 334 PSW32_MASK_PSTATE; 335 #endif 336 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 337 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 338 339 if (MACHINE_HAS_MVCOS) { 340 printk("mvcos available.\n"); 341 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 342 } else { 343 printk("mvcos not available.\n"); 344 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 345 } 346 } 347 348 /* 349 * Switch kernel/user addressing modes? 350 */ 351 static int __init early_parse_switch_amode(char *p) 352 { 353 switch_amode = 1; 354 return 0; 355 } 356 early_param("switch_amode", early_parse_switch_amode); 357 358 #else /* CONFIG_S390_SWITCH_AMODE */ 359 static inline void set_amode_and_uaccess(unsigned long user_amode, 360 unsigned long user32_amode) 361 { 362 } 363 #endif /* CONFIG_S390_SWITCH_AMODE */ 364 365 #ifdef CONFIG_S390_EXEC_PROTECT 366 unsigned int s390_noexec = 0; 367 EXPORT_SYMBOL_GPL(s390_noexec); 368 369 /* 370 * Enable execute protection? 371 */ 372 static int __init early_parse_noexec(char *p) 373 { 374 if (!strncmp(p, "off", 3)) 375 return 0; 376 switch_amode = 1; 377 s390_noexec = 1; 378 return 0; 379 } 380 early_param("noexec", early_parse_noexec); 381 #endif /* CONFIG_S390_EXEC_PROTECT */ 382 383 static void setup_addressing_mode(void) 384 { 385 if (s390_noexec) { 386 printk("S390 execute protection active, "); 387 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY); 388 } else if (switch_amode) { 389 printk("S390 address spaces switched, "); 390 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY); 391 } 392 #ifdef CONFIG_TRACE_IRQFLAGS 393 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 394 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 395 #endif 396 } 397 398 static void __init 399 setup_lowcore(void) 400 { 401 struct _lowcore *lc; 402 int lc_pages; 403 404 /* 405 * Setup lowcore for boot cpu 406 */ 407 lc_pages = sizeof(void *) == 8 ? 2 : 1; 408 lc = (struct _lowcore *) 409 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 410 memset(lc, 0, lc_pages * PAGE_SIZE); 411 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 412 lc->restart_psw.addr = 413 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 414 if (switch_amode) 415 lc->restart_psw.mask |= PSW_ASC_HOME; 416 lc->external_new_psw.mask = psw_kernel_bits; 417 lc->external_new_psw.addr = 418 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 419 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 420 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 421 lc->program_new_psw.mask = psw_kernel_bits; 422 lc->program_new_psw.addr = 423 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 424 lc->mcck_new_psw.mask = 425 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 426 lc->mcck_new_psw.addr = 427 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 428 lc->io_new_psw.mask = psw_kernel_bits; 429 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 430 lc->ipl_device = S390_lowcore.ipl_device; 431 lc->jiffy_timer = -1LL; 432 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 433 lc->async_stack = (unsigned long) 434 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 435 lc->panic_stack = (unsigned long) 436 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 437 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 438 lc->thread_info = (unsigned long) &init_thread_union; 439 #ifndef CONFIG_64BIT 440 if (MACHINE_HAS_IEEE) { 441 lc->extended_save_area_addr = (__u32) 442 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 443 /* enable extended save area */ 444 __ctl_set_bit(14, 29); 445 } 446 #endif 447 set_prefix((u32)(unsigned long) lc); 448 } 449 450 static void __init 451 setup_resources(void) 452 { 453 struct resource *res, *sub_res; 454 int i; 455 456 code_resource.start = (unsigned long) &_text; 457 code_resource.end = (unsigned long) &_etext - 1; 458 data_resource.start = (unsigned long) &_etext; 459 data_resource.end = (unsigned long) &_edata - 1; 460 461 for (i = 0; i < MEMORY_CHUNKS; i++) { 462 if (!memory_chunk[i].size) 463 continue; 464 res = alloc_bootmem_low(sizeof(struct resource)); 465 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 466 switch (memory_chunk[i].type) { 467 case CHUNK_READ_WRITE: 468 res->name = "System RAM"; 469 break; 470 case CHUNK_READ_ONLY: 471 res->name = "System ROM"; 472 res->flags |= IORESOURCE_READONLY; 473 break; 474 default: 475 res->name = "reserved"; 476 } 477 res->start = memory_chunk[i].addr; 478 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 479 request_resource(&iomem_resource, res); 480 481 if (code_resource.start >= res->start && 482 code_resource.start <= res->end && 483 code_resource.end > res->end) { 484 sub_res = alloc_bootmem_low(sizeof(struct resource)); 485 memcpy(sub_res, &code_resource, 486 sizeof(struct resource)); 487 sub_res->end = res->end; 488 code_resource.start = res->end + 1; 489 request_resource(res, sub_res); 490 } 491 492 if (code_resource.start >= res->start && 493 code_resource.start <= res->end && 494 code_resource.end <= res->end) 495 request_resource(res, &code_resource); 496 497 if (data_resource.start >= res->start && 498 data_resource.start <= res->end && 499 data_resource.end > res->end) { 500 sub_res = alloc_bootmem_low(sizeof(struct resource)); 501 memcpy(sub_res, &data_resource, 502 sizeof(struct resource)); 503 sub_res->end = res->end; 504 data_resource.start = res->end + 1; 505 request_resource(res, sub_res); 506 } 507 508 if (data_resource.start >= res->start && 509 data_resource.start <= res->end && 510 data_resource.end <= res->end) 511 request_resource(res, &data_resource); 512 } 513 } 514 515 unsigned long real_memory_size; 516 EXPORT_SYMBOL_GPL(real_memory_size); 517 518 static void __init setup_memory_end(void) 519 { 520 unsigned long memory_size; 521 unsigned long max_mem; 522 int i; 523 524 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 525 if (ipl_info.type == IPL_TYPE_FCP_DUMP) 526 memory_end = ZFCPDUMP_HSA_SIZE; 527 #endif 528 memory_size = 0; 529 memory_end &= PAGE_MASK; 530 531 max_mem = memory_end ? min(VMALLOC_START, memory_end) : VMALLOC_START; 532 memory_end = min(max_mem, memory_end); 533 534 /* 535 * Make sure all chunks are MAX_ORDER aligned so we don't need the 536 * extra checks that HOLES_IN_ZONE would require. 537 */ 538 for (i = 0; i < MEMORY_CHUNKS; i++) { 539 unsigned long start, end; 540 struct mem_chunk *chunk; 541 unsigned long align; 542 543 chunk = &memory_chunk[i]; 544 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 545 start = (chunk->addr + align - 1) & ~(align - 1); 546 end = (chunk->addr + chunk->size) & ~(align - 1); 547 if (start >= end) 548 memset(chunk, 0, sizeof(*chunk)); 549 else { 550 chunk->addr = start; 551 chunk->size = end - start; 552 } 553 } 554 555 for (i = 0; i < MEMORY_CHUNKS; i++) { 556 struct mem_chunk *chunk = &memory_chunk[i]; 557 558 real_memory_size = max(real_memory_size, 559 chunk->addr + chunk->size); 560 if (chunk->addr >= max_mem) { 561 memset(chunk, 0, sizeof(*chunk)); 562 continue; 563 } 564 if (chunk->addr + chunk->size > max_mem) 565 chunk->size = max_mem - chunk->addr; 566 memory_size = max(memory_size, chunk->addr + chunk->size); 567 } 568 if (!memory_end) 569 memory_end = memory_size; 570 } 571 572 static void __init 573 setup_memory(void) 574 { 575 unsigned long bootmap_size; 576 unsigned long start_pfn, end_pfn; 577 int i; 578 579 /* 580 * partially used pages are not usable - thus 581 * we are rounding upwards: 582 */ 583 start_pfn = PFN_UP(__pa(&_end)); 584 end_pfn = max_pfn = PFN_DOWN(memory_end); 585 586 #ifdef CONFIG_BLK_DEV_INITRD 587 /* 588 * Move the initrd in case the bitmap of the bootmem allocater 589 * would overwrite it. 590 */ 591 592 if (INITRD_START && INITRD_SIZE) { 593 unsigned long bmap_size; 594 unsigned long start; 595 596 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 597 bmap_size = PFN_PHYS(bmap_size); 598 599 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 600 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 601 602 if (start + INITRD_SIZE > memory_end) { 603 printk("initrd extends beyond end of memory " 604 "(0x%08lx > 0x%08lx)\n" 605 "disabling initrd\n", 606 start + INITRD_SIZE, memory_end); 607 INITRD_START = INITRD_SIZE = 0; 608 } else { 609 printk("Moving initrd (0x%08lx -> 0x%08lx, " 610 "size: %ld)\n", 611 INITRD_START, start, INITRD_SIZE); 612 memmove((void *) start, (void *) INITRD_START, 613 INITRD_SIZE); 614 INITRD_START = start; 615 } 616 } 617 } 618 #endif 619 620 /* 621 * Initialize the boot-time allocator 622 */ 623 bootmap_size = init_bootmem(start_pfn, end_pfn); 624 625 /* 626 * Register RAM areas with the bootmem allocator. 627 */ 628 629 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 630 unsigned long start_chunk, end_chunk, pfn; 631 632 if (memory_chunk[i].type != CHUNK_READ_WRITE) 633 continue; 634 start_chunk = PFN_DOWN(memory_chunk[i].addr); 635 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1; 636 end_chunk = min(end_chunk, end_pfn); 637 if (start_chunk >= end_chunk) 638 continue; 639 add_active_range(0, start_chunk, end_chunk); 640 pfn = max(start_chunk, start_pfn); 641 for (; pfn <= end_chunk; pfn++) 642 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 643 } 644 645 psw_set_key(PAGE_DEFAULT_KEY); 646 647 free_bootmem_with_active_regions(0, max_pfn); 648 649 /* 650 * Reserve memory used for lowcore/command line/kernel image. 651 */ 652 reserve_bootmem(0, (unsigned long)_ehead); 653 reserve_bootmem((unsigned long)_stext, 654 PFN_PHYS(start_pfn) - (unsigned long)_stext); 655 /* 656 * Reserve the bootmem bitmap itself as well. We do this in two 657 * steps (first step was init_bootmem()) because this catches 658 * the (very unlikely) case of us accidentally initializing the 659 * bootmem allocator with an invalid RAM area. 660 */ 661 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size); 662 663 #ifdef CONFIG_BLK_DEV_INITRD 664 if (INITRD_START && INITRD_SIZE) { 665 if (INITRD_START + INITRD_SIZE <= memory_end) { 666 reserve_bootmem(INITRD_START, INITRD_SIZE); 667 initrd_start = INITRD_START; 668 initrd_end = initrd_start + INITRD_SIZE; 669 } else { 670 printk("initrd extends beyond end of memory " 671 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 672 initrd_start + INITRD_SIZE, memory_end); 673 initrd_start = initrd_end = 0; 674 } 675 } 676 #endif 677 } 678 679 static __init unsigned int stfl(void) 680 { 681 asm volatile( 682 " .insn s,0xb2b10000,0(0)\n" /* stfl */ 683 "0:\n" 684 EX_TABLE(0b,0b)); 685 return S390_lowcore.stfl_fac_list; 686 } 687 688 static __init int stfle(unsigned long long *list, int doublewords) 689 { 690 typedef struct { unsigned long long _[doublewords]; } addrtype; 691 register unsigned long __nr asm("0") = doublewords - 1; 692 693 asm volatile(".insn s,0xb2b00000,%0" /* stfle */ 694 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc"); 695 return __nr + 1; 696 } 697 698 /* 699 * Setup hardware capabilities. 700 */ 701 static void __init setup_hwcaps(void) 702 { 703 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 704 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; 705 unsigned long long facility_list_extended; 706 unsigned int facility_list; 707 int i; 708 709 facility_list = stfl(); 710 /* 711 * The store facility list bits numbers as found in the principles 712 * of operation are numbered with bit 1UL<<31 as number 0 to 713 * bit 1UL<<0 as number 31. 714 * Bit 0: instructions named N3, "backported" to esa-mode 715 * Bit 2: z/Architecture mode is active 716 * Bit 7: the store-facility-list-extended facility is installed 717 * Bit 17: the message-security assist is installed 718 * Bit 19: the long-displacement facility is installed 719 * Bit 21: the extended-immediate facility is installed 720 * These get translated to: 721 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 722 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 723 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5. 724 */ 725 for (i = 0; i < 6; i++) 726 if (facility_list & (1UL << (31 - stfl_bits[i]))) 727 elf_hwcap |= 1UL << i; 728 729 /* 730 * Check for additional facilities with store-facility-list-extended. 731 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 732 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 733 * as stored by stfl, bits 32-xxx contain additional facilities. 734 * How many facility words are stored depends on the number of 735 * doublewords passed to the instruction. The additional facilites 736 * are: 737 * Bit 43: decimal floating point facility is installed 738 * translated to: 739 * HWCAP_S390_DFP bit 6. 740 */ 741 if ((elf_hwcap & (1UL << 2)) && 742 stfle(&facility_list_extended, 1) > 0) { 743 if (facility_list_extended & (1ULL << (64 - 43))) 744 elf_hwcap |= 1UL << 6; 745 } 746 747 switch (cpuinfo->cpu_id.machine) { 748 case 0x9672: 749 #if !defined(CONFIG_64BIT) 750 default: /* Use "g5" as default for 31 bit kernels. */ 751 #endif 752 strcpy(elf_platform, "g5"); 753 break; 754 case 0x2064: 755 case 0x2066: 756 #if defined(CONFIG_64BIT) 757 default: /* Use "z900" as default for 64 bit kernels. */ 758 #endif 759 strcpy(elf_platform, "z900"); 760 break; 761 case 0x2084: 762 case 0x2086: 763 strcpy(elf_platform, "z990"); 764 break; 765 case 0x2094: 766 strcpy(elf_platform, "z9-109"); 767 break; 768 } 769 } 770 771 /* 772 * Setup function called from init/main.c just after the banner 773 * was printed. 774 */ 775 776 void __init 777 setup_arch(char **cmdline_p) 778 { 779 /* 780 * print what head.S has found out about the machine 781 */ 782 #ifndef CONFIG_64BIT 783 printk((MACHINE_IS_VM) ? 784 "We are running under VM (31 bit mode)\n" : 785 "We are running native (31 bit mode)\n"); 786 printk((MACHINE_HAS_IEEE) ? 787 "This machine has an IEEE fpu\n" : 788 "This machine has no IEEE fpu\n"); 789 #else /* CONFIG_64BIT */ 790 printk((MACHINE_IS_VM) ? 791 "We are running under VM (64 bit mode)\n" : 792 "We are running native (64 bit mode)\n"); 793 #endif /* CONFIG_64BIT */ 794 795 /* Save unparsed command line copy for /proc/cmdline */ 796 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 797 798 *cmdline_p = COMMAND_LINE; 799 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0'; 800 801 ROOT_DEV = Root_RAM0; 802 803 init_mm.start_code = PAGE_OFFSET; 804 init_mm.end_code = (unsigned long) &_etext; 805 init_mm.end_data = (unsigned long) &_edata; 806 init_mm.brk = (unsigned long) &_end; 807 808 if (MACHINE_HAS_MVCOS) 809 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 810 else 811 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 812 813 parse_early_param(); 814 815 setup_ipl(); 816 setup_memory_end(); 817 setup_addressing_mode(); 818 setup_memory(); 819 setup_resources(); 820 setup_lowcore(); 821 822 cpu_init(); 823 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 824 825 /* 826 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 827 */ 828 setup_hwcaps(); 829 830 /* 831 * Create kernel page tables and switch to virtual addressing. 832 */ 833 paging_init(); 834 835 /* Setup default console */ 836 conmode_default(); 837 838 /* Setup zfcpdump support */ 839 setup_zfcpdump(console_devno); 840 } 841 842 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo) 843 { 844 printk(KERN_INFO "cpu %d " 845 #ifdef CONFIG_SMP 846 "phys_idx=%d " 847 #endif 848 "vers=%02X ident=%06X machine=%04X unused=%04X\n", 849 cpuinfo->cpu_nr, 850 #ifdef CONFIG_SMP 851 cpuinfo->cpu_addr, 852 #endif 853 cpuinfo->cpu_id.version, 854 cpuinfo->cpu_id.ident, 855 cpuinfo->cpu_id.machine, 856 cpuinfo->cpu_id.unused); 857 } 858 859 /* 860 * show_cpuinfo - Get information on one CPU for use by procfs. 861 */ 862 863 static int show_cpuinfo(struct seq_file *m, void *v) 864 { 865 static const char *hwcap_str[7] = { 866 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp" 867 }; 868 struct cpuinfo_S390 *cpuinfo; 869 unsigned long n = (unsigned long) v - 1; 870 int i; 871 872 s390_adjust_jiffies(); 873 preempt_disable(); 874 if (!n) { 875 seq_printf(m, "vendor_id : IBM/S390\n" 876 "# processors : %i\n" 877 "bogomips per cpu: %lu.%02lu\n", 878 num_online_cpus(), loops_per_jiffy/(500000/HZ), 879 (loops_per_jiffy/(5000/HZ))%100); 880 seq_puts(m, "features\t: "); 881 for (i = 0; i < 7; i++) 882 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 883 seq_printf(m, "%s ", hwcap_str[i]); 884 seq_puts(m, "\n"); 885 } 886 887 if (cpu_online(n)) { 888 #ifdef CONFIG_SMP 889 if (smp_processor_id() == n) 890 cpuinfo = &S390_lowcore.cpu_data; 891 else 892 cpuinfo = &lowcore_ptr[n]->cpu_data; 893 #else 894 cpuinfo = &S390_lowcore.cpu_data; 895 #endif 896 seq_printf(m, "processor %li: " 897 "version = %02X, " 898 "identification = %06X, " 899 "machine = %04X\n", 900 n, cpuinfo->cpu_id.version, 901 cpuinfo->cpu_id.ident, 902 cpuinfo->cpu_id.machine); 903 } 904 preempt_enable(); 905 return 0; 906 } 907 908 static void *c_start(struct seq_file *m, loff_t *pos) 909 { 910 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; 911 } 912 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 913 { 914 ++*pos; 915 return c_start(m, pos); 916 } 917 static void c_stop(struct seq_file *m, void *v) 918 { 919 } 920 const struct seq_operations cpuinfo_op = { 921 .start = c_start, 922 .next = c_next, 923 .stop = c_stop, 924 .show = show_cpuinfo, 925 }; 926 927