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; 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) || 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 { 209 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 210 SET_CONSOLE_SCLP; 211 #endif 212 } 213 } 214 215 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 216 static void __init setup_zfcpdump(unsigned int console_devno) 217 { 218 static char str[41]; 219 220 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 221 return; 222 if (console_devno != -1) 223 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 224 ipl_info.data.fcp.dev_id.devno, console_devno); 225 else 226 sprintf(str, " cio_ignore=all,!0.0.%04x", 227 ipl_info.data.fcp.dev_id.devno); 228 strcat(boot_command_line, str); 229 console_loglevel = 2; 230 } 231 #else 232 static inline void setup_zfcpdump(unsigned int console_devno) {} 233 #endif /* CONFIG_ZFCPDUMP */ 234 235 /* 236 * Reboot, halt and power_off stubs. They just call _machine_restart, 237 * _machine_halt or _machine_power_off. 238 */ 239 240 void machine_restart(char *command) 241 { 242 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 243 /* 244 * Only unblank the console if we are called in enabled 245 * context or a bust_spinlocks cleared the way for us. 246 */ 247 console_unblank(); 248 _machine_restart(command); 249 } 250 251 void machine_halt(void) 252 { 253 if (!in_interrupt() || oops_in_progress) 254 /* 255 * Only unblank the console if we are called in enabled 256 * context or a bust_spinlocks cleared the way for us. 257 */ 258 console_unblank(); 259 _machine_halt(); 260 } 261 262 void machine_power_off(void) 263 { 264 if (!in_interrupt() || 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_power_off(); 271 } 272 273 /* 274 * Dummy power off function. 275 */ 276 void (*pm_power_off)(void) = machine_power_off; 277 278 static int __init early_parse_mem(char *p) 279 { 280 memory_end = memparse(p, &p); 281 return 0; 282 } 283 early_param("mem", early_parse_mem); 284 285 #ifdef CONFIG_S390_SWITCH_AMODE 286 #ifdef CONFIG_PGSTE 287 unsigned int switch_amode = 1; 288 #else 289 unsigned int switch_amode = 0; 290 #endif 291 EXPORT_SYMBOL_GPL(switch_amode); 292 293 static void set_amode_and_uaccess(unsigned long user_amode, 294 unsigned long user32_amode) 295 { 296 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 297 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 298 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 299 #ifdef CONFIG_COMPAT 300 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 301 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 302 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 303 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 304 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 305 PSW32_MASK_PSTATE; 306 #endif 307 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 308 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 309 310 if (MACHINE_HAS_MVCOS) { 311 printk("mvcos available.\n"); 312 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 313 } else { 314 printk("mvcos not available.\n"); 315 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 316 } 317 } 318 319 /* 320 * Switch kernel/user addressing modes? 321 */ 322 static int __init early_parse_switch_amode(char *p) 323 { 324 switch_amode = 1; 325 return 0; 326 } 327 early_param("switch_amode", early_parse_switch_amode); 328 329 #else /* CONFIG_S390_SWITCH_AMODE */ 330 static inline void set_amode_and_uaccess(unsigned long user_amode, 331 unsigned long user32_amode) 332 { 333 } 334 #endif /* CONFIG_S390_SWITCH_AMODE */ 335 336 #ifdef CONFIG_S390_EXEC_PROTECT 337 unsigned int s390_noexec = 0; 338 EXPORT_SYMBOL_GPL(s390_noexec); 339 340 /* 341 * Enable execute protection? 342 */ 343 static int __init early_parse_noexec(char *p) 344 { 345 if (!strncmp(p, "off", 3)) 346 return 0; 347 switch_amode = 1; 348 s390_noexec = 1; 349 return 0; 350 } 351 early_param("noexec", early_parse_noexec); 352 #endif /* CONFIG_S390_EXEC_PROTECT */ 353 354 static void setup_addressing_mode(void) 355 { 356 if (s390_noexec) { 357 printk("S390 execute protection active, "); 358 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY); 359 } else if (switch_amode) { 360 printk("S390 address spaces switched, "); 361 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY); 362 } 363 #ifdef CONFIG_TRACE_IRQFLAGS 364 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 365 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 366 #endif 367 } 368 369 static void __init 370 setup_lowcore(void) 371 { 372 struct _lowcore *lc; 373 int lc_pages; 374 375 /* 376 * Setup lowcore for boot cpu 377 */ 378 lc_pages = sizeof(void *) == 8 ? 2 : 1; 379 lc = (struct _lowcore *) 380 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 381 memset(lc, 0, lc_pages * PAGE_SIZE); 382 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 383 lc->restart_psw.addr = 384 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 385 if (switch_amode) 386 lc->restart_psw.mask |= PSW_ASC_HOME; 387 lc->external_new_psw.mask = psw_kernel_bits; 388 lc->external_new_psw.addr = 389 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 390 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 391 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 392 lc->program_new_psw.mask = psw_kernel_bits; 393 lc->program_new_psw.addr = 394 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 395 lc->mcck_new_psw.mask = 396 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 397 lc->mcck_new_psw.addr = 398 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 399 lc->io_new_psw.mask = psw_kernel_bits; 400 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 401 lc->ipl_device = S390_lowcore.ipl_device; 402 lc->clock_comparator = -1ULL; 403 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 404 lc->async_stack = (unsigned long) 405 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 406 lc->panic_stack = (unsigned long) 407 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 408 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 409 lc->thread_info = (unsigned long) &init_thread_union; 410 #ifndef CONFIG_64BIT 411 if (MACHINE_HAS_IEEE) { 412 lc->extended_save_area_addr = (__u32) 413 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 414 /* enable extended save area */ 415 __ctl_set_bit(14, 29); 416 } 417 #endif 418 set_prefix((u32)(unsigned long) lc); 419 } 420 421 static void __init 422 setup_resources(void) 423 { 424 struct resource *res, *sub_res; 425 int i; 426 427 code_resource.start = (unsigned long) &_text; 428 code_resource.end = (unsigned long) &_etext - 1; 429 data_resource.start = (unsigned long) &_etext; 430 data_resource.end = (unsigned long) &_edata - 1; 431 432 for (i = 0; i < MEMORY_CHUNKS; i++) { 433 if (!memory_chunk[i].size) 434 continue; 435 res = alloc_bootmem_low(sizeof(struct resource)); 436 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 437 switch (memory_chunk[i].type) { 438 case CHUNK_READ_WRITE: 439 res->name = "System RAM"; 440 break; 441 case CHUNK_READ_ONLY: 442 res->name = "System ROM"; 443 res->flags |= IORESOURCE_READONLY; 444 break; 445 default: 446 res->name = "reserved"; 447 } 448 res->start = memory_chunk[i].addr; 449 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 450 request_resource(&iomem_resource, res); 451 452 if (code_resource.start >= res->start && 453 code_resource.start <= res->end && 454 code_resource.end > res->end) { 455 sub_res = alloc_bootmem_low(sizeof(struct resource)); 456 memcpy(sub_res, &code_resource, 457 sizeof(struct resource)); 458 sub_res->end = res->end; 459 code_resource.start = res->end + 1; 460 request_resource(res, sub_res); 461 } 462 463 if (code_resource.start >= res->start && 464 code_resource.start <= res->end && 465 code_resource.end <= res->end) 466 request_resource(res, &code_resource); 467 468 if (data_resource.start >= res->start && 469 data_resource.start <= res->end && 470 data_resource.end > res->end) { 471 sub_res = alloc_bootmem_low(sizeof(struct resource)); 472 memcpy(sub_res, &data_resource, 473 sizeof(struct resource)); 474 sub_res->end = res->end; 475 data_resource.start = res->end + 1; 476 request_resource(res, sub_res); 477 } 478 479 if (data_resource.start >= res->start && 480 data_resource.start <= res->end && 481 data_resource.end <= res->end) 482 request_resource(res, &data_resource); 483 } 484 } 485 486 unsigned long real_memory_size; 487 EXPORT_SYMBOL_GPL(real_memory_size); 488 489 static void __init setup_memory_end(void) 490 { 491 unsigned long memory_size; 492 unsigned long max_mem; 493 int i; 494 495 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 496 if (ipl_info.type == IPL_TYPE_FCP_DUMP) 497 memory_end = ZFCPDUMP_HSA_SIZE; 498 #endif 499 memory_size = 0; 500 memory_end &= PAGE_MASK; 501 502 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 503 memory_end = min(max_mem, memory_end); 504 505 /* 506 * Make sure all chunks are MAX_ORDER aligned so we don't need the 507 * extra checks that HOLES_IN_ZONE would require. 508 */ 509 for (i = 0; i < MEMORY_CHUNKS; i++) { 510 unsigned long start, end; 511 struct mem_chunk *chunk; 512 unsigned long align; 513 514 chunk = &memory_chunk[i]; 515 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 516 start = (chunk->addr + align - 1) & ~(align - 1); 517 end = (chunk->addr + chunk->size) & ~(align - 1); 518 if (start >= end) 519 memset(chunk, 0, sizeof(*chunk)); 520 else { 521 chunk->addr = start; 522 chunk->size = end - start; 523 } 524 } 525 526 for (i = 0; i < MEMORY_CHUNKS; i++) { 527 struct mem_chunk *chunk = &memory_chunk[i]; 528 529 real_memory_size = max(real_memory_size, 530 chunk->addr + chunk->size); 531 if (chunk->addr >= max_mem) { 532 memset(chunk, 0, sizeof(*chunk)); 533 continue; 534 } 535 if (chunk->addr + chunk->size > max_mem) 536 chunk->size = max_mem - chunk->addr; 537 memory_size = max(memory_size, chunk->addr + chunk->size); 538 } 539 if (!memory_end) 540 memory_end = memory_size; 541 } 542 543 static void __init 544 setup_memory(void) 545 { 546 unsigned long bootmap_size; 547 unsigned long start_pfn, end_pfn; 548 int i; 549 550 /* 551 * partially used pages are not usable - thus 552 * we are rounding upwards: 553 */ 554 start_pfn = PFN_UP(__pa(&_end)); 555 end_pfn = max_pfn = PFN_DOWN(memory_end); 556 557 #ifdef CONFIG_BLK_DEV_INITRD 558 /* 559 * Move the initrd in case the bitmap of the bootmem allocater 560 * would overwrite it. 561 */ 562 563 if (INITRD_START && INITRD_SIZE) { 564 unsigned long bmap_size; 565 unsigned long start; 566 567 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 568 bmap_size = PFN_PHYS(bmap_size); 569 570 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 571 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 572 573 if (start + INITRD_SIZE > memory_end) { 574 printk("initrd extends beyond end of memory " 575 "(0x%08lx > 0x%08lx)\n" 576 "disabling initrd\n", 577 start + INITRD_SIZE, memory_end); 578 INITRD_START = INITRD_SIZE = 0; 579 } else { 580 printk("Moving initrd (0x%08lx -> 0x%08lx, " 581 "size: %ld)\n", 582 INITRD_START, start, INITRD_SIZE); 583 memmove((void *) start, (void *) INITRD_START, 584 INITRD_SIZE); 585 INITRD_START = start; 586 } 587 } 588 } 589 #endif 590 591 /* 592 * Initialize the boot-time allocator 593 */ 594 bootmap_size = init_bootmem(start_pfn, end_pfn); 595 596 /* 597 * Register RAM areas with the bootmem allocator. 598 */ 599 600 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 601 unsigned long start_chunk, end_chunk, pfn; 602 603 if (memory_chunk[i].type != CHUNK_READ_WRITE) 604 continue; 605 start_chunk = PFN_DOWN(memory_chunk[i].addr); 606 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1; 607 end_chunk = min(end_chunk, end_pfn); 608 if (start_chunk >= end_chunk) 609 continue; 610 add_active_range(0, start_chunk, end_chunk); 611 pfn = max(start_chunk, start_pfn); 612 for (; pfn <= end_chunk; pfn++) 613 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 614 } 615 616 psw_set_key(PAGE_DEFAULT_KEY); 617 618 free_bootmem_with_active_regions(0, max_pfn); 619 620 /* 621 * Reserve memory used for lowcore/command line/kernel image. 622 */ 623 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 624 reserve_bootmem((unsigned long)_stext, 625 PFN_PHYS(start_pfn) - (unsigned long)_stext, 626 BOOTMEM_DEFAULT); 627 /* 628 * Reserve the bootmem bitmap itself as well. We do this in two 629 * steps (first step was init_bootmem()) because this catches 630 * the (very unlikely) case of us accidentally initializing the 631 * bootmem allocator with an invalid RAM area. 632 */ 633 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 634 BOOTMEM_DEFAULT); 635 636 #ifdef CONFIG_BLK_DEV_INITRD 637 if (INITRD_START && INITRD_SIZE) { 638 if (INITRD_START + INITRD_SIZE <= memory_end) { 639 reserve_bootmem(INITRD_START, INITRD_SIZE, 640 BOOTMEM_DEFAULT); 641 initrd_start = INITRD_START; 642 initrd_end = initrd_start + INITRD_SIZE; 643 } else { 644 printk("initrd extends beyond end of memory " 645 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 646 initrd_start + INITRD_SIZE, memory_end); 647 initrd_start = initrd_end = 0; 648 } 649 } 650 #endif 651 } 652 653 static int __init __stfle(unsigned long long *list, int doublewords) 654 { 655 typedef struct { unsigned long long _[doublewords]; } addrtype; 656 register unsigned long __nr asm("0") = doublewords - 1; 657 658 asm volatile(".insn s,0xb2b00000,%0" /* stfle */ 659 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc"); 660 return __nr + 1; 661 } 662 663 int __init stfle(unsigned long long *list, int doublewords) 664 { 665 if (!(stfl() & (1UL << 24))) 666 return -EOPNOTSUPP; 667 return __stfle(list, doublewords); 668 } 669 670 /* 671 * Setup hardware capabilities. 672 */ 673 static void __init setup_hwcaps(void) 674 { 675 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 676 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; 677 unsigned long long facility_list_extended; 678 unsigned int facility_list; 679 int i; 680 681 facility_list = stfl(); 682 /* 683 * The store facility list bits numbers as found in the principles 684 * of operation are numbered with bit 1UL<<31 as number 0 to 685 * bit 1UL<<0 as number 31. 686 * Bit 0: instructions named N3, "backported" to esa-mode 687 * Bit 2: z/Architecture mode is active 688 * Bit 7: the store-facility-list-extended facility is installed 689 * Bit 17: the message-security assist is installed 690 * Bit 19: the long-displacement facility is installed 691 * Bit 21: the extended-immediate facility is installed 692 * These get translated to: 693 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 694 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 695 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5. 696 */ 697 for (i = 0; i < 6; i++) 698 if (facility_list & (1UL << (31 - stfl_bits[i]))) 699 elf_hwcap |= 1UL << i; 700 701 /* 702 * Check for additional facilities with store-facility-list-extended. 703 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 704 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 705 * as stored by stfl, bits 32-xxx contain additional facilities. 706 * How many facility words are stored depends on the number of 707 * doublewords passed to the instruction. The additional facilites 708 * are: 709 * Bit 43: decimal floating point facility is installed 710 * translated to: 711 * HWCAP_S390_DFP bit 6. 712 */ 713 if ((elf_hwcap & (1UL << 2)) && 714 __stfle(&facility_list_extended, 1) > 0) { 715 if (facility_list_extended & (1ULL << (64 - 43))) 716 elf_hwcap |= 1UL << 6; 717 } 718 719 if (MACHINE_HAS_HPAGE) 720 elf_hwcap |= 1UL << 7; 721 722 switch (cpuinfo->cpu_id.machine) { 723 case 0x9672: 724 #if !defined(CONFIG_64BIT) 725 default: /* Use "g5" as default for 31 bit kernels. */ 726 #endif 727 strcpy(elf_platform, "g5"); 728 break; 729 case 0x2064: 730 case 0x2066: 731 #if defined(CONFIG_64BIT) 732 default: /* Use "z900" as default for 64 bit kernels. */ 733 #endif 734 strcpy(elf_platform, "z900"); 735 break; 736 case 0x2084: 737 case 0x2086: 738 strcpy(elf_platform, "z990"); 739 break; 740 case 0x2094: 741 strcpy(elf_platform, "z9-109"); 742 break; 743 } 744 } 745 746 /* 747 * Setup function called from init/main.c just after the banner 748 * was printed. 749 */ 750 751 void __init 752 setup_arch(char **cmdline_p) 753 { 754 /* 755 * print what head.S has found out about the machine 756 */ 757 #ifndef CONFIG_64BIT 758 printk((MACHINE_IS_VM) ? 759 "We are running under VM (31 bit mode)\n" : 760 "We are running native (31 bit mode)\n"); 761 printk((MACHINE_HAS_IEEE) ? 762 "This machine has an IEEE fpu\n" : 763 "This machine has no IEEE fpu\n"); 764 #else /* CONFIG_64BIT */ 765 if (MACHINE_IS_VM) 766 printk("We are running under VM (64 bit mode)\n"); 767 else if (MACHINE_IS_KVM) { 768 printk("We are running under KVM (64 bit mode)\n"); 769 add_preferred_console("ttyS", 1, NULL); 770 } else 771 printk("We are running native (64 bit mode)\n"); 772 #endif /* CONFIG_64BIT */ 773 774 /* Have one command line that is parsed and saved in /proc/cmdline */ 775 /* boot_command_line has been already set up in early.c */ 776 *cmdline_p = boot_command_line; 777 778 ROOT_DEV = Root_RAM0; 779 780 init_mm.start_code = PAGE_OFFSET; 781 init_mm.end_code = (unsigned long) &_etext; 782 init_mm.end_data = (unsigned long) &_edata; 783 init_mm.brk = (unsigned long) &_end; 784 785 if (MACHINE_HAS_MVCOS) 786 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 787 else 788 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 789 790 parse_early_param(); 791 792 setup_ipl(); 793 setup_memory_end(); 794 setup_addressing_mode(); 795 setup_memory(); 796 setup_resources(); 797 setup_lowcore(); 798 799 cpu_init(); 800 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 801 s390_init_cpu_topology(); 802 803 /* 804 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 805 */ 806 setup_hwcaps(); 807 808 /* 809 * Create kernel page tables and switch to virtual addressing. 810 */ 811 paging_init(); 812 813 /* Setup default console */ 814 conmode_default(); 815 816 /* Setup zfcpdump support */ 817 setup_zfcpdump(console_devno); 818 } 819 820 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo) 821 { 822 printk(KERN_INFO "cpu %d " 823 #ifdef CONFIG_SMP 824 "phys_idx=%d " 825 #endif 826 "vers=%02X ident=%06X machine=%04X unused=%04X\n", 827 cpuinfo->cpu_nr, 828 #ifdef CONFIG_SMP 829 cpuinfo->cpu_addr, 830 #endif 831 cpuinfo->cpu_id.version, 832 cpuinfo->cpu_id.ident, 833 cpuinfo->cpu_id.machine, 834 cpuinfo->cpu_id.unused); 835 } 836 837 /* 838 * show_cpuinfo - Get information on one CPU for use by procfs. 839 */ 840 841 static int show_cpuinfo(struct seq_file *m, void *v) 842 { 843 static const char *hwcap_str[8] = { 844 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp", 845 "edat" 846 }; 847 struct cpuinfo_S390 *cpuinfo; 848 unsigned long n = (unsigned long) v - 1; 849 int i; 850 851 s390_adjust_jiffies(); 852 preempt_disable(); 853 if (!n) { 854 seq_printf(m, "vendor_id : IBM/S390\n" 855 "# processors : %i\n" 856 "bogomips per cpu: %lu.%02lu\n", 857 num_online_cpus(), loops_per_jiffy/(500000/HZ), 858 (loops_per_jiffy/(5000/HZ))%100); 859 seq_puts(m, "features\t: "); 860 for (i = 0; i < 8; i++) 861 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 862 seq_printf(m, "%s ", hwcap_str[i]); 863 seq_puts(m, "\n"); 864 } 865 866 if (cpu_online(n)) { 867 #ifdef CONFIG_SMP 868 if (smp_processor_id() == n) 869 cpuinfo = &S390_lowcore.cpu_data; 870 else 871 cpuinfo = &lowcore_ptr[n]->cpu_data; 872 #else 873 cpuinfo = &S390_lowcore.cpu_data; 874 #endif 875 seq_printf(m, "processor %li: " 876 "version = %02X, " 877 "identification = %06X, " 878 "machine = %04X\n", 879 n, cpuinfo->cpu_id.version, 880 cpuinfo->cpu_id.ident, 881 cpuinfo->cpu_id.machine); 882 } 883 preempt_enable(); 884 return 0; 885 } 886 887 static void *c_start(struct seq_file *m, loff_t *pos) 888 { 889 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; 890 } 891 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 892 { 893 ++*pos; 894 return c_start(m, pos); 895 } 896 static void c_stop(struct seq_file *m, void *v) 897 { 898 } 899 const struct seq_operations cpuinfo_op = { 900 .start = c_start, 901 .next = c_next, 902 .stop = c_stop, 903 .show = show_cpuinfo, 904 }; 905 906