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 43 #include <asm/ipl.h> 44 #include <asm/uaccess.h> 45 #include <asm/system.h> 46 #include <asm/smp.h> 47 #include <asm/mmu_context.h> 48 #include <asm/cpcmd.h> 49 #include <asm/lowcore.h> 50 #include <asm/irq.h> 51 #include <asm/page.h> 52 #include <asm/ptrace.h> 53 #include <asm/sections.h> 54 #include <asm/ebcdic.h> 55 #include <asm/compat.h> 56 57 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY | 58 PSW_MASK_MCHECK | PSW_DEFAULT_KEY); 59 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 60 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 61 PSW_MASK_PSTATE | PSW_DEFAULT_KEY); 62 63 /* 64 * User copy operations. 65 */ 66 struct uaccess_ops uaccess; 67 EXPORT_SYMBOL(uaccess); 68 69 /* 70 * Machine setup.. 71 */ 72 unsigned int console_mode = 0; 73 unsigned int console_devno = -1; 74 unsigned int console_irq = -1; 75 unsigned long machine_flags = 0; 76 unsigned long elf_hwcap = 0; 77 char elf_platform[ELF_PLATFORM_SIZE]; 78 79 struct mem_chunk __meminitdata memory_chunk[MEMORY_CHUNKS]; 80 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ 81 static unsigned long __initdata memory_end; 82 83 /* 84 * This is set up by the setup-routine at boot-time 85 * for S390 need to find out, what we have to setup 86 * using address 0x10400 ... 87 */ 88 89 #include <asm/setup.h> 90 91 static struct resource code_resource = { 92 .name = "Kernel code", 93 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 94 }; 95 96 static struct resource data_resource = { 97 .name = "Kernel data", 98 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 99 }; 100 101 /* 102 * cpu_init() initializes state that is per-CPU. 103 */ 104 void __cpuinit cpu_init(void) 105 { 106 int addr = hard_smp_processor_id(); 107 108 /* 109 * Store processor id in lowcore (used e.g. in timer_interrupt) 110 */ 111 get_cpu_id(&S390_lowcore.cpu_data.cpu_id); 112 S390_lowcore.cpu_data.cpu_addr = addr; 113 114 /* 115 * Force FPU initialization: 116 */ 117 clear_thread_flag(TIF_USEDFPU); 118 clear_used_math(); 119 120 atomic_inc(&init_mm.mm_count); 121 current->active_mm = &init_mm; 122 if (current->mm) 123 BUG(); 124 enter_lazy_tlb(&init_mm, current); 125 } 126 127 /* 128 * condev= and conmode= setup parameter. 129 */ 130 131 static int __init condev_setup(char *str) 132 { 133 int vdev; 134 135 vdev = simple_strtoul(str, &str, 0); 136 if (vdev >= 0 && vdev < 65536) { 137 console_devno = vdev; 138 console_irq = -1; 139 } 140 return 1; 141 } 142 143 __setup("condev=", condev_setup); 144 145 static int __init conmode_setup(char *str) 146 { 147 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 148 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 149 SET_CONSOLE_SCLP; 150 #endif 151 #if defined(CONFIG_TN3215_CONSOLE) 152 if (strncmp(str, "3215", 5) == 0) 153 SET_CONSOLE_3215; 154 #endif 155 #if defined(CONFIG_TN3270_CONSOLE) 156 if (strncmp(str, "3270", 5) == 0) 157 SET_CONSOLE_3270; 158 #endif 159 return 1; 160 } 161 162 __setup("conmode=", conmode_setup); 163 164 static void __init conmode_default(void) 165 { 166 char query_buffer[1024]; 167 char *ptr; 168 169 if (MACHINE_IS_VM) { 170 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 171 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 172 ptr = strstr(query_buffer, "SUBCHANNEL ="); 173 console_irq = simple_strtoul(ptr + 13, NULL, 16); 174 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 175 ptr = strstr(query_buffer, "CONMODE"); 176 /* 177 * Set the conmode to 3215 so that the device recognition 178 * will set the cu_type of the console to 3215. If the 179 * conmode is 3270 and we don't set it back then both 180 * 3215 and the 3270 driver will try to access the console 181 * device (3215 as console and 3270 as normal tty). 182 */ 183 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 184 if (ptr == NULL) { 185 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 186 SET_CONSOLE_SCLP; 187 #endif 188 return; 189 } 190 if (strncmp(ptr + 8, "3270", 4) == 0) { 191 #if defined(CONFIG_TN3270_CONSOLE) 192 SET_CONSOLE_3270; 193 #elif defined(CONFIG_TN3215_CONSOLE) 194 SET_CONSOLE_3215; 195 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 196 SET_CONSOLE_SCLP; 197 #endif 198 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 199 #if defined(CONFIG_TN3215_CONSOLE) 200 SET_CONSOLE_3215; 201 #elif defined(CONFIG_TN3270_CONSOLE) 202 SET_CONSOLE_3270; 203 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 204 SET_CONSOLE_SCLP; 205 #endif 206 } 207 } else if (MACHINE_IS_P390) { 208 #if defined(CONFIG_TN3215_CONSOLE) 209 SET_CONSOLE_3215; 210 #elif defined(CONFIG_TN3270_CONSOLE) 211 SET_CONSOLE_3270; 212 #endif 213 } else { 214 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 215 SET_CONSOLE_SCLP; 216 #endif 217 } 218 } 219 220 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 221 static void __init setup_zfcpdump(unsigned int console_devno) 222 { 223 static char str[64]; 224 225 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 226 return; 227 if (console_devno != -1) 228 sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x", 229 ipl_info.data.fcp.dev_id.devno, console_devno); 230 else 231 sprintf(str, "cio_ignore=all,!0.0.%04x", 232 ipl_info.data.fcp.dev_id.devno); 233 strcat(COMMAND_LINE, " "); 234 strcat(COMMAND_LINE, str); 235 console_loglevel = 2; 236 } 237 #else 238 static inline void setup_zfcpdump(unsigned int console_devno) {} 239 #endif /* CONFIG_ZFCPDUMP */ 240 241 /* 242 * Reboot, halt and power_off stubs. They just call _machine_restart, 243 * _machine_halt or _machine_power_off. 244 */ 245 246 void machine_restart(char *command) 247 { 248 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 249 /* 250 * Only unblank the console if we are called in enabled 251 * context or a bust_spinlocks cleared the way for us. 252 */ 253 console_unblank(); 254 _machine_restart(command); 255 } 256 257 void machine_halt(void) 258 { 259 if (!in_interrupt() || oops_in_progress) 260 /* 261 * Only unblank the console if we are called in enabled 262 * context or a bust_spinlocks cleared the way for us. 263 */ 264 console_unblank(); 265 _machine_halt(); 266 } 267 268 void machine_power_off(void) 269 { 270 if (!in_interrupt() || oops_in_progress) 271 /* 272 * Only unblank the console if we are called in enabled 273 * context or a bust_spinlocks cleared the way for us. 274 */ 275 console_unblank(); 276 _machine_power_off(); 277 } 278 279 /* 280 * Dummy power off function. 281 */ 282 void (*pm_power_off)(void) = machine_power_off; 283 284 static int __init early_parse_mem(char *p) 285 { 286 memory_end = memparse(p, &p); 287 return 0; 288 } 289 early_param("mem", early_parse_mem); 290 291 /* 292 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes 293 */ 294 static int __init early_parse_ipldelay(char *p) 295 { 296 unsigned long delay = 0; 297 298 delay = simple_strtoul(p, &p, 0); 299 300 switch (*p) { 301 case 's': 302 case 'S': 303 delay *= 1000000; 304 break; 305 case 'm': 306 case 'M': 307 delay *= 60 * 1000000; 308 } 309 310 /* now wait for the requested amount of time */ 311 udelay(delay); 312 313 return 0; 314 } 315 early_param("ipldelay", early_parse_ipldelay); 316 317 #ifdef CONFIG_S390_SWITCH_AMODE 318 unsigned int switch_amode = 0; 319 EXPORT_SYMBOL_GPL(switch_amode); 320 321 static void set_amode_and_uaccess(unsigned long user_amode, 322 unsigned long user32_amode) 323 { 324 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 325 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 326 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 327 #ifdef CONFIG_COMPAT 328 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 329 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 330 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 331 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 332 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 333 PSW32_MASK_PSTATE; 334 #endif 335 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 336 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 337 338 if (MACHINE_HAS_MVCOS) { 339 printk("mvcos available.\n"); 340 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 341 } else { 342 printk("mvcos not available.\n"); 343 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 344 } 345 } 346 347 /* 348 * Switch kernel/user addressing modes? 349 */ 350 static int __init early_parse_switch_amode(char *p) 351 { 352 switch_amode = 1; 353 return 0; 354 } 355 early_param("switch_amode", early_parse_switch_amode); 356 357 #else /* CONFIG_S390_SWITCH_AMODE */ 358 static inline void set_amode_and_uaccess(unsigned long user_amode, 359 unsigned long user32_amode) 360 { 361 } 362 #endif /* CONFIG_S390_SWITCH_AMODE */ 363 364 #ifdef CONFIG_S390_EXEC_PROTECT 365 unsigned int s390_noexec = 0; 366 EXPORT_SYMBOL_GPL(s390_noexec); 367 368 /* 369 * Enable execute protection? 370 */ 371 static int __init early_parse_noexec(char *p) 372 { 373 if (!strncmp(p, "off", 3)) 374 return 0; 375 switch_amode = 1; 376 s390_noexec = 1; 377 return 0; 378 } 379 early_param("noexec", early_parse_noexec); 380 #endif /* CONFIG_S390_EXEC_PROTECT */ 381 382 static void setup_addressing_mode(void) 383 { 384 if (s390_noexec) { 385 printk("S390 execute protection active, "); 386 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY); 387 } else if (switch_amode) { 388 printk("S390 address spaces switched, "); 389 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY); 390 } 391 #ifdef CONFIG_TRACE_IRQFLAGS 392 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 393 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 394 #endif 395 } 396 397 static void __init 398 setup_lowcore(void) 399 { 400 struct _lowcore *lc; 401 int lc_pages; 402 403 /* 404 * Setup lowcore for boot cpu 405 */ 406 lc_pages = sizeof(void *) == 8 ? 2 : 1; 407 lc = (struct _lowcore *) 408 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 409 memset(lc, 0, lc_pages * PAGE_SIZE); 410 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 411 lc->restart_psw.addr = 412 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 413 if (switch_amode) 414 lc->restart_psw.mask |= PSW_ASC_HOME; 415 lc->external_new_psw.mask = psw_kernel_bits; 416 lc->external_new_psw.addr = 417 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 418 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 419 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 420 lc->program_new_psw.mask = psw_kernel_bits; 421 lc->program_new_psw.addr = 422 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 423 lc->mcck_new_psw.mask = 424 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 425 lc->mcck_new_psw.addr = 426 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 427 lc->io_new_psw.mask = psw_kernel_bits; 428 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 429 lc->ipl_device = S390_lowcore.ipl_device; 430 lc->jiffy_timer = -1LL; 431 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 432 lc->async_stack = (unsigned long) 433 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 434 lc->panic_stack = (unsigned long) 435 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 436 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 437 lc->thread_info = (unsigned long) &init_thread_union; 438 #ifndef CONFIG_64BIT 439 if (MACHINE_HAS_IEEE) { 440 lc->extended_save_area_addr = (__u32) 441 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 442 /* enable extended save area */ 443 __ctl_set_bit(14, 29); 444 } 445 #endif 446 set_prefix((u32)(unsigned long) lc); 447 } 448 449 static void __init 450 setup_resources(void) 451 { 452 struct resource *res, *sub_res; 453 int i; 454 455 code_resource.start = (unsigned long) &_text; 456 code_resource.end = (unsigned long) &_etext - 1; 457 data_resource.start = (unsigned long) &_etext; 458 data_resource.end = (unsigned long) &_edata - 1; 459 460 for (i = 0; i < MEMORY_CHUNKS; i++) { 461 if (!memory_chunk[i].size) 462 continue; 463 res = alloc_bootmem_low(sizeof(struct resource)); 464 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 465 switch (memory_chunk[i].type) { 466 case CHUNK_READ_WRITE: 467 res->name = "System RAM"; 468 break; 469 case CHUNK_READ_ONLY: 470 res->name = "System ROM"; 471 res->flags |= IORESOURCE_READONLY; 472 break; 473 default: 474 res->name = "reserved"; 475 } 476 res->start = memory_chunk[i].addr; 477 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 478 request_resource(&iomem_resource, res); 479 480 if (code_resource.start >= res->start && 481 code_resource.start <= res->end && 482 code_resource.end > res->end) { 483 sub_res = alloc_bootmem_low(sizeof(struct resource)); 484 memcpy(sub_res, &code_resource, 485 sizeof(struct resource)); 486 sub_res->end = res->end; 487 code_resource.start = res->end + 1; 488 request_resource(res, sub_res); 489 } 490 491 if (code_resource.start >= res->start && 492 code_resource.start <= res->end && 493 code_resource.end <= res->end) 494 request_resource(res, &code_resource); 495 496 if (data_resource.start >= res->start && 497 data_resource.start <= res->end && 498 data_resource.end > res->end) { 499 sub_res = alloc_bootmem_low(sizeof(struct resource)); 500 memcpy(sub_res, &data_resource, 501 sizeof(struct resource)); 502 sub_res->end = res->end; 503 data_resource.start = res->end + 1; 504 request_resource(res, sub_res); 505 } 506 507 if (data_resource.start >= res->start && 508 data_resource.start <= res->end && 509 data_resource.end <= res->end) 510 request_resource(res, &data_resource); 511 } 512 } 513 514 unsigned long real_memory_size; 515 EXPORT_SYMBOL_GPL(real_memory_size); 516 517 static void __init setup_memory_end(void) 518 { 519 unsigned long memory_size; 520 unsigned long max_mem; 521 int i; 522 523 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 524 if (ipl_info.type == IPL_TYPE_FCP_DUMP) 525 memory_end = ZFCPDUMP_HSA_SIZE; 526 #endif 527 memory_size = 0; 528 memory_end &= PAGE_MASK; 529 530 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 531 memory_end = min(max_mem, memory_end); 532 533 /* 534 * Make sure all chunks are MAX_ORDER aligned so we don't need the 535 * extra checks that HOLES_IN_ZONE would require. 536 */ 537 for (i = 0; i < MEMORY_CHUNKS; i++) { 538 unsigned long start, end; 539 struct mem_chunk *chunk; 540 unsigned long align; 541 542 chunk = &memory_chunk[i]; 543 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 544 start = (chunk->addr + align - 1) & ~(align - 1); 545 end = (chunk->addr + chunk->size) & ~(align - 1); 546 if (start >= end) 547 memset(chunk, 0, sizeof(*chunk)); 548 else { 549 chunk->addr = start; 550 chunk->size = end - start; 551 } 552 } 553 554 for (i = 0; i < MEMORY_CHUNKS; i++) { 555 struct mem_chunk *chunk = &memory_chunk[i]; 556 557 real_memory_size = max(real_memory_size, 558 chunk->addr + chunk->size); 559 if (chunk->addr >= max_mem) { 560 memset(chunk, 0, sizeof(*chunk)); 561 continue; 562 } 563 if (chunk->addr + chunk->size > max_mem) 564 chunk->size = max_mem - chunk->addr; 565 memory_size = max(memory_size, chunk->addr + chunk->size); 566 } 567 if (!memory_end) 568 memory_end = memory_size; 569 } 570 571 static void __init 572 setup_memory(void) 573 { 574 unsigned long bootmap_size; 575 unsigned long start_pfn, end_pfn; 576 int i; 577 578 /* 579 * partially used pages are not usable - thus 580 * we are rounding upwards: 581 */ 582 start_pfn = PFN_UP(__pa(&_end)); 583 end_pfn = max_pfn = PFN_DOWN(memory_end); 584 585 #ifdef CONFIG_BLK_DEV_INITRD 586 /* 587 * Move the initrd in case the bitmap of the bootmem allocater 588 * would overwrite it. 589 */ 590 591 if (INITRD_START && INITRD_SIZE) { 592 unsigned long bmap_size; 593 unsigned long start; 594 595 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 596 bmap_size = PFN_PHYS(bmap_size); 597 598 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 599 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 600 601 if (start + INITRD_SIZE > memory_end) { 602 printk("initrd extends beyond end of memory " 603 "(0x%08lx > 0x%08lx)\n" 604 "disabling initrd\n", 605 start + INITRD_SIZE, memory_end); 606 INITRD_START = INITRD_SIZE = 0; 607 } else { 608 printk("Moving initrd (0x%08lx -> 0x%08lx, " 609 "size: %ld)\n", 610 INITRD_START, start, INITRD_SIZE); 611 memmove((void *) start, (void *) INITRD_START, 612 INITRD_SIZE); 613 INITRD_START = start; 614 } 615 } 616 } 617 #endif 618 619 /* 620 * Initialize the boot-time allocator 621 */ 622 bootmap_size = init_bootmem(start_pfn, end_pfn); 623 624 /* 625 * Register RAM areas with the bootmem allocator. 626 */ 627 628 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 629 unsigned long start_chunk, end_chunk, pfn; 630 631 if (memory_chunk[i].type != CHUNK_READ_WRITE) 632 continue; 633 start_chunk = PFN_DOWN(memory_chunk[i].addr); 634 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1; 635 end_chunk = min(end_chunk, end_pfn); 636 if (start_chunk >= end_chunk) 637 continue; 638 add_active_range(0, start_chunk, end_chunk); 639 pfn = max(start_chunk, start_pfn); 640 for (; pfn <= end_chunk; pfn++) 641 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 642 } 643 644 psw_set_key(PAGE_DEFAULT_KEY); 645 646 free_bootmem_with_active_regions(0, max_pfn); 647 648 /* 649 * Reserve memory used for lowcore/command line/kernel image. 650 */ 651 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 652 reserve_bootmem((unsigned long)_stext, 653 PFN_PHYS(start_pfn) - (unsigned long)_stext, 654 BOOTMEM_DEFAULT); 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 BOOTMEM_DEFAULT); 663 664 #ifdef CONFIG_BLK_DEV_INITRD 665 if (INITRD_START && INITRD_SIZE) { 666 if (INITRD_START + INITRD_SIZE <= memory_end) { 667 reserve_bootmem(INITRD_START, INITRD_SIZE, 668 BOOTMEM_DEFAULT); 669 initrd_start = INITRD_START; 670 initrd_end = initrd_start + INITRD_SIZE; 671 } else { 672 printk("initrd extends beyond end of memory " 673 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 674 initrd_start + INITRD_SIZE, memory_end); 675 initrd_start = initrd_end = 0; 676 } 677 } 678 #endif 679 } 680 681 static __init unsigned int stfl(void) 682 { 683 asm volatile( 684 " .insn s,0xb2b10000,0(0)\n" /* stfl */ 685 "0:\n" 686 EX_TABLE(0b,0b)); 687 return S390_lowcore.stfl_fac_list; 688 } 689 690 static __init int stfle(unsigned long long *list, int doublewords) 691 { 692 typedef struct { unsigned long long _[doublewords]; } addrtype; 693 register unsigned long __nr asm("0") = doublewords - 1; 694 695 asm volatile(".insn s,0xb2b00000,%0" /* stfle */ 696 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc"); 697 return __nr + 1; 698 } 699 700 /* 701 * Setup hardware capabilities. 702 */ 703 static void __init setup_hwcaps(void) 704 { 705 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 706 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; 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 * These get translated to: 723 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 724 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 725 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5. 726 */ 727 for (i = 0; i < 6; i++) 728 if (facility_list & (1UL << (31 - stfl_bits[i]))) 729 elf_hwcap |= 1UL << i; 730 731 /* 732 * Check for additional facilities with store-facility-list-extended. 733 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 734 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 735 * as stored by stfl, bits 32-xxx contain additional facilities. 736 * How many facility words are stored depends on the number of 737 * doublewords passed to the instruction. The additional facilites 738 * are: 739 * Bit 43: decimal floating point facility is installed 740 * translated to: 741 * HWCAP_S390_DFP bit 6. 742 */ 743 if ((elf_hwcap & (1UL << 2)) && 744 stfle(&facility_list_extended, 1) > 0) { 745 if (facility_list_extended & (1ULL << (64 - 43))) 746 elf_hwcap |= 1UL << 6; 747 } 748 749 switch (cpuinfo->cpu_id.machine) { 750 case 0x9672: 751 #if !defined(CONFIG_64BIT) 752 default: /* Use "g5" as default for 31 bit kernels. */ 753 #endif 754 strcpy(elf_platform, "g5"); 755 break; 756 case 0x2064: 757 case 0x2066: 758 #if defined(CONFIG_64BIT) 759 default: /* Use "z900" as default for 64 bit kernels. */ 760 #endif 761 strcpy(elf_platform, "z900"); 762 break; 763 case 0x2084: 764 case 0x2086: 765 strcpy(elf_platform, "z990"); 766 break; 767 case 0x2094: 768 strcpy(elf_platform, "z9-109"); 769 break; 770 } 771 } 772 773 /* 774 * Setup function called from init/main.c just after the banner 775 * was printed. 776 */ 777 778 void __init 779 setup_arch(char **cmdline_p) 780 { 781 /* 782 * print what head.S has found out about the machine 783 */ 784 #ifndef CONFIG_64BIT 785 printk((MACHINE_IS_VM) ? 786 "We are running under VM (31 bit mode)\n" : 787 "We are running native (31 bit mode)\n"); 788 printk((MACHINE_HAS_IEEE) ? 789 "This machine has an IEEE fpu\n" : 790 "This machine has no IEEE fpu\n"); 791 #else /* CONFIG_64BIT */ 792 printk((MACHINE_IS_VM) ? 793 "We are running under VM (64 bit mode)\n" : 794 "We are running native (64 bit mode)\n"); 795 #endif /* CONFIG_64BIT */ 796 797 /* Save unparsed command line copy for /proc/cmdline */ 798 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 799 800 *cmdline_p = COMMAND_LINE; 801 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0'; 802 803 ROOT_DEV = Root_RAM0; 804 805 init_mm.start_code = PAGE_OFFSET; 806 init_mm.end_code = (unsigned long) &_etext; 807 init_mm.end_data = (unsigned long) &_edata; 808 init_mm.brk = (unsigned long) &_end; 809 810 if (MACHINE_HAS_MVCOS) 811 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 812 else 813 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 814 815 parse_early_param(); 816 817 setup_ipl(); 818 setup_memory_end(); 819 setup_addressing_mode(); 820 setup_memory(); 821 setup_resources(); 822 setup_lowcore(); 823 824 cpu_init(); 825 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 826 827 /* 828 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 829 */ 830 setup_hwcaps(); 831 832 /* 833 * Create kernel page tables and switch to virtual addressing. 834 */ 835 paging_init(); 836 837 /* Setup default console */ 838 conmode_default(); 839 840 /* Setup zfcpdump support */ 841 setup_zfcpdump(console_devno); 842 } 843 844 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo) 845 { 846 printk(KERN_INFO "cpu %d " 847 #ifdef CONFIG_SMP 848 "phys_idx=%d " 849 #endif 850 "vers=%02X ident=%06X machine=%04X unused=%04X\n", 851 cpuinfo->cpu_nr, 852 #ifdef CONFIG_SMP 853 cpuinfo->cpu_addr, 854 #endif 855 cpuinfo->cpu_id.version, 856 cpuinfo->cpu_id.ident, 857 cpuinfo->cpu_id.machine, 858 cpuinfo->cpu_id.unused); 859 } 860 861 /* 862 * show_cpuinfo - Get information on one CPU for use by procfs. 863 */ 864 865 static int show_cpuinfo(struct seq_file *m, void *v) 866 { 867 static const char *hwcap_str[7] = { 868 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp" 869 }; 870 struct cpuinfo_S390 *cpuinfo; 871 unsigned long n = (unsigned long) v - 1; 872 int i; 873 874 s390_adjust_jiffies(); 875 preempt_disable(); 876 if (!n) { 877 seq_printf(m, "vendor_id : IBM/S390\n" 878 "# processors : %i\n" 879 "bogomips per cpu: %lu.%02lu\n", 880 num_online_cpus(), loops_per_jiffy/(500000/HZ), 881 (loops_per_jiffy/(5000/HZ))%100); 882 seq_puts(m, "features\t: "); 883 for (i = 0; i < 7; i++) 884 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 885 seq_printf(m, "%s ", hwcap_str[i]); 886 seq_puts(m, "\n"); 887 } 888 889 if (cpu_online(n)) { 890 #ifdef CONFIG_SMP 891 if (smp_processor_id() == n) 892 cpuinfo = &S390_lowcore.cpu_data; 893 else 894 cpuinfo = &lowcore_ptr[n]->cpu_data; 895 #else 896 cpuinfo = &S390_lowcore.cpu_data; 897 #endif 898 seq_printf(m, "processor %li: " 899 "version = %02X, " 900 "identification = %06X, " 901 "machine = %04X\n", 902 n, cpuinfo->cpu_id.version, 903 cpuinfo->cpu_id.ident, 904 cpuinfo->cpu_id.machine); 905 } 906 preempt_enable(); 907 return 0; 908 } 909 910 static void *c_start(struct seq_file *m, loff_t *pos) 911 { 912 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; 913 } 914 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 915 { 916 ++*pos; 917 return c_start(m, pos); 918 } 919 static void c_stop(struct seq_file *m, void *v) 920 { 921 } 922 const struct seq_operations cpuinfo_op = { 923 .start = c_start, 924 .next = c_next, 925 .stop = c_stop, 926 .show = show_cpuinfo, 927 }; 928 929