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 #include <asm/kvm_virtio.h> 58 59 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY | 60 PSW_MASK_MCHECK | PSW_DEFAULT_KEY); 61 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 62 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 63 PSW_MASK_PSTATE | PSW_DEFAULT_KEY); 64 65 /* 66 * User copy operations. 67 */ 68 struct uaccess_ops uaccess; 69 EXPORT_SYMBOL(uaccess); 70 71 /* 72 * Machine setup.. 73 */ 74 unsigned int console_mode = 0; 75 unsigned int console_devno = -1; 76 unsigned int console_irq = -1; 77 unsigned long machine_flags; 78 unsigned long elf_hwcap = 0; 79 char elf_platform[ELF_PLATFORM_SIZE]; 80 81 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS]; 82 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ 83 static unsigned long __initdata memory_end; 84 85 /* 86 * This is set up by the setup-routine at boot-time 87 * for S390 need to find out, what we have to setup 88 * using address 0x10400 ... 89 */ 90 91 #include <asm/setup.h> 92 93 static struct resource code_resource = { 94 .name = "Kernel code", 95 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 96 }; 97 98 static struct resource data_resource = { 99 .name = "Kernel data", 100 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 101 }; 102 103 /* 104 * cpu_init() initializes state that is per-CPU. 105 */ 106 void __cpuinit cpu_init(void) 107 { 108 int addr = hard_smp_processor_id(); 109 110 /* 111 * Store processor id in lowcore (used e.g. in timer_interrupt) 112 */ 113 get_cpu_id(&S390_lowcore.cpu_data.cpu_id); 114 S390_lowcore.cpu_data.cpu_addr = addr; 115 116 /* 117 * Force FPU initialization: 118 */ 119 clear_thread_flag(TIF_USEDFPU); 120 clear_used_math(); 121 122 atomic_inc(&init_mm.mm_count); 123 current->active_mm = &init_mm; 124 if (current->mm) 125 BUG(); 126 enter_lazy_tlb(&init_mm, current); 127 } 128 129 /* 130 * condev= and conmode= setup parameter. 131 */ 132 133 static int __init condev_setup(char *str) 134 { 135 int vdev; 136 137 vdev = simple_strtoul(str, &str, 0); 138 if (vdev >= 0 && vdev < 65536) { 139 console_devno = vdev; 140 console_irq = -1; 141 } 142 return 1; 143 } 144 145 __setup("condev=", condev_setup); 146 147 static int __init conmode_setup(char *str) 148 { 149 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 150 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 151 SET_CONSOLE_SCLP; 152 #endif 153 #if defined(CONFIG_TN3215_CONSOLE) 154 if (strncmp(str, "3215", 5) == 0) 155 SET_CONSOLE_3215; 156 #endif 157 #if defined(CONFIG_TN3270_CONSOLE) 158 if (strncmp(str, "3270", 5) == 0) 159 SET_CONSOLE_3270; 160 #endif 161 return 1; 162 } 163 164 __setup("conmode=", conmode_setup); 165 166 static void __init conmode_default(void) 167 { 168 char query_buffer[1024]; 169 char *ptr; 170 171 if (MACHINE_IS_VM) { 172 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 173 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 174 ptr = strstr(query_buffer, "SUBCHANNEL ="); 175 console_irq = simple_strtoul(ptr + 13, NULL, 16); 176 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 177 ptr = strstr(query_buffer, "CONMODE"); 178 /* 179 * Set the conmode to 3215 so that the device recognition 180 * will set the cu_type of the console to 3215. If the 181 * conmode is 3270 and we don't set it back then both 182 * 3215 and the 3270 driver will try to access the console 183 * device (3215 as console and 3270 as normal tty). 184 */ 185 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 186 if (ptr == NULL) { 187 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 188 SET_CONSOLE_SCLP; 189 #endif 190 return; 191 } 192 if (strncmp(ptr + 8, "3270", 4) == 0) { 193 #if defined(CONFIG_TN3270_CONSOLE) 194 SET_CONSOLE_3270; 195 #elif defined(CONFIG_TN3215_CONSOLE) 196 SET_CONSOLE_3215; 197 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 198 SET_CONSOLE_SCLP; 199 #endif 200 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 201 #if defined(CONFIG_TN3215_CONSOLE) 202 SET_CONSOLE_3215; 203 #elif defined(CONFIG_TN3270_CONSOLE) 204 SET_CONSOLE_3270; 205 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 206 SET_CONSOLE_SCLP; 207 #endif 208 } 209 } else { 210 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 211 SET_CONSOLE_SCLP; 212 #endif 213 } 214 } 215 216 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 217 static void __init setup_zfcpdump(unsigned int console_devno) 218 { 219 static char str[41]; 220 221 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 222 return; 223 if (console_devno != -1) 224 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 225 ipl_info.data.fcp.dev_id.devno, console_devno); 226 else 227 sprintf(str, " cio_ignore=all,!0.0.%04x", 228 ipl_info.data.fcp.dev_id.devno); 229 strcat(boot_command_line, str); 230 console_loglevel = 2; 231 } 232 #else 233 static inline void setup_zfcpdump(unsigned int console_devno) {} 234 #endif /* CONFIG_ZFCPDUMP */ 235 236 /* 237 * Reboot, halt and power_off stubs. They just call _machine_restart, 238 * _machine_halt or _machine_power_off. 239 */ 240 241 void machine_restart(char *command) 242 { 243 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 244 /* 245 * Only unblank the console if we are called in enabled 246 * context or a bust_spinlocks cleared the way for us. 247 */ 248 console_unblank(); 249 _machine_restart(command); 250 } 251 252 void machine_halt(void) 253 { 254 if (!in_interrupt() || oops_in_progress) 255 /* 256 * Only unblank the console if we are called in enabled 257 * context or a bust_spinlocks cleared the way for us. 258 */ 259 console_unblank(); 260 _machine_halt(); 261 } 262 263 void machine_power_off(void) 264 { 265 if (!in_interrupt() || oops_in_progress) 266 /* 267 * Only unblank the console if we are called in enabled 268 * context or a bust_spinlocks cleared the way for us. 269 */ 270 console_unblank(); 271 _machine_power_off(); 272 } 273 274 /* 275 * Dummy power off function. 276 */ 277 void (*pm_power_off)(void) = machine_power_off; 278 279 static int __init early_parse_mem(char *p) 280 { 281 memory_end = memparse(p, &p); 282 return 0; 283 } 284 early_param("mem", early_parse_mem); 285 286 #ifdef CONFIG_S390_SWITCH_AMODE 287 #ifdef CONFIG_PGSTE 288 unsigned int switch_amode = 1; 289 #else 290 unsigned int switch_amode = 0; 291 #endif 292 EXPORT_SYMBOL_GPL(switch_amode); 293 294 static void set_amode_and_uaccess(unsigned long user_amode, 295 unsigned long user32_amode) 296 { 297 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 298 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 299 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 300 #ifdef CONFIG_COMPAT 301 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 302 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 303 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 304 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 305 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 306 PSW32_MASK_PSTATE; 307 #endif 308 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 309 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 310 311 if (MACHINE_HAS_MVCOS) { 312 printk("mvcos available.\n"); 313 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 314 } else { 315 printk("mvcos not available.\n"); 316 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 317 } 318 } 319 320 /* 321 * Switch kernel/user addressing modes? 322 */ 323 static int __init early_parse_switch_amode(char *p) 324 { 325 switch_amode = 1; 326 return 0; 327 } 328 early_param("switch_amode", early_parse_switch_amode); 329 330 #else /* CONFIG_S390_SWITCH_AMODE */ 331 static inline void set_amode_and_uaccess(unsigned long user_amode, 332 unsigned long user32_amode) 333 { 334 } 335 #endif /* CONFIG_S390_SWITCH_AMODE */ 336 337 #ifdef CONFIG_S390_EXEC_PROTECT 338 unsigned int s390_noexec = 0; 339 EXPORT_SYMBOL_GPL(s390_noexec); 340 341 /* 342 * Enable execute protection? 343 */ 344 static int __init early_parse_noexec(char *p) 345 { 346 if (!strncmp(p, "off", 3)) 347 return 0; 348 switch_amode = 1; 349 s390_noexec = 1; 350 return 0; 351 } 352 early_param("noexec", early_parse_noexec); 353 #endif /* CONFIG_S390_EXEC_PROTECT */ 354 355 static void setup_addressing_mode(void) 356 { 357 if (s390_noexec) { 358 printk("S390 execute protection active, "); 359 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY); 360 } else if (switch_amode) { 361 printk("S390 address spaces switched, "); 362 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY); 363 } 364 #ifdef CONFIG_TRACE_IRQFLAGS 365 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 366 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 367 #endif 368 } 369 370 static void __init 371 setup_lowcore(void) 372 { 373 struct _lowcore *lc; 374 int lc_pages; 375 376 /* 377 * Setup lowcore for boot cpu 378 */ 379 lc_pages = sizeof(void *) == 8 ? 2 : 1; 380 lc = (struct _lowcore *) 381 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 382 memset(lc, 0, lc_pages * PAGE_SIZE); 383 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 384 lc->restart_psw.addr = 385 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 386 if (switch_amode) 387 lc->restart_psw.mask |= PSW_ASC_HOME; 388 lc->external_new_psw.mask = psw_kernel_bits; 389 lc->external_new_psw.addr = 390 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 391 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 392 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 393 lc->program_new_psw.mask = psw_kernel_bits; 394 lc->program_new_psw.addr = 395 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 396 lc->mcck_new_psw.mask = 397 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 398 lc->mcck_new_psw.addr = 399 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 400 lc->io_new_psw.mask = psw_kernel_bits; 401 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 402 lc->ipl_device = S390_lowcore.ipl_device; 403 lc->clock_comparator = -1ULL; 404 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 405 lc->async_stack = (unsigned long) 406 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 407 lc->panic_stack = (unsigned long) 408 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 409 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 410 lc->thread_info = (unsigned long) &init_thread_union; 411 #ifndef CONFIG_64BIT 412 if (MACHINE_HAS_IEEE) { 413 lc->extended_save_area_addr = (__u32) 414 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 415 /* enable extended save area */ 416 __ctl_set_bit(14, 29); 417 } 418 #endif 419 set_prefix((u32)(unsigned long) lc); 420 } 421 422 static void __init 423 setup_resources(void) 424 { 425 struct resource *res, *sub_res; 426 int i; 427 428 code_resource.start = (unsigned long) &_text; 429 code_resource.end = (unsigned long) &_etext - 1; 430 data_resource.start = (unsigned long) &_etext; 431 data_resource.end = (unsigned long) &_edata - 1; 432 433 for (i = 0; i < MEMORY_CHUNKS; i++) { 434 if (!memory_chunk[i].size) 435 continue; 436 res = alloc_bootmem_low(sizeof(struct resource)); 437 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 438 switch (memory_chunk[i].type) { 439 case CHUNK_READ_WRITE: 440 res->name = "System RAM"; 441 break; 442 case CHUNK_READ_ONLY: 443 res->name = "System ROM"; 444 res->flags |= IORESOURCE_READONLY; 445 break; 446 default: 447 res->name = "reserved"; 448 } 449 res->start = memory_chunk[i].addr; 450 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 451 request_resource(&iomem_resource, res); 452 453 if (code_resource.start >= res->start && 454 code_resource.start <= res->end && 455 code_resource.end > res->end) { 456 sub_res = alloc_bootmem_low(sizeof(struct resource)); 457 memcpy(sub_res, &code_resource, 458 sizeof(struct resource)); 459 sub_res->end = res->end; 460 code_resource.start = res->end + 1; 461 request_resource(res, sub_res); 462 } 463 464 if (code_resource.start >= res->start && 465 code_resource.start <= res->end && 466 code_resource.end <= res->end) 467 request_resource(res, &code_resource); 468 469 if (data_resource.start >= res->start && 470 data_resource.start <= res->end && 471 data_resource.end > res->end) { 472 sub_res = alloc_bootmem_low(sizeof(struct resource)); 473 memcpy(sub_res, &data_resource, 474 sizeof(struct resource)); 475 sub_res->end = res->end; 476 data_resource.start = res->end + 1; 477 request_resource(res, sub_res); 478 } 479 480 if (data_resource.start >= res->start && 481 data_resource.start <= res->end && 482 data_resource.end <= res->end) 483 request_resource(res, &data_resource); 484 } 485 } 486 487 unsigned long real_memory_size; 488 EXPORT_SYMBOL_GPL(real_memory_size); 489 490 static void __init setup_memory_end(void) 491 { 492 unsigned long memory_size; 493 unsigned long max_mem; 494 int i; 495 496 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 497 if (ipl_info.type == IPL_TYPE_FCP_DUMP) 498 memory_end = ZFCPDUMP_HSA_SIZE; 499 #endif 500 memory_size = 0; 501 memory_end &= PAGE_MASK; 502 503 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 504 memory_end = min(max_mem, memory_end); 505 506 /* 507 * Make sure all chunks are MAX_ORDER aligned so we don't need the 508 * extra checks that HOLES_IN_ZONE would require. 509 */ 510 for (i = 0; i < MEMORY_CHUNKS; i++) { 511 unsigned long start, end; 512 struct mem_chunk *chunk; 513 unsigned long align; 514 515 chunk = &memory_chunk[i]; 516 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 517 start = (chunk->addr + align - 1) & ~(align - 1); 518 end = (chunk->addr + chunk->size) & ~(align - 1); 519 if (start >= end) 520 memset(chunk, 0, sizeof(*chunk)); 521 else { 522 chunk->addr = start; 523 chunk->size = end - start; 524 } 525 } 526 527 for (i = 0; i < MEMORY_CHUNKS; i++) { 528 struct mem_chunk *chunk = &memory_chunk[i]; 529 530 real_memory_size = max(real_memory_size, 531 chunk->addr + chunk->size); 532 if (chunk->addr >= max_mem) { 533 memset(chunk, 0, sizeof(*chunk)); 534 continue; 535 } 536 if (chunk->addr + chunk->size > max_mem) 537 chunk->size = max_mem - chunk->addr; 538 memory_size = max(memory_size, chunk->addr + chunk->size); 539 } 540 if (!memory_end) 541 memory_end = memory_size; 542 } 543 544 static void __init 545 setup_memory(void) 546 { 547 unsigned long bootmap_size; 548 unsigned long start_pfn, end_pfn; 549 int i; 550 551 /* 552 * partially used pages are not usable - thus 553 * we are rounding upwards: 554 */ 555 start_pfn = PFN_UP(__pa(&_end)); 556 end_pfn = max_pfn = PFN_DOWN(memory_end); 557 558 #ifdef CONFIG_BLK_DEV_INITRD 559 /* 560 * Move the initrd in case the bitmap of the bootmem allocater 561 * would overwrite it. 562 */ 563 564 if (INITRD_START && INITRD_SIZE) { 565 unsigned long bmap_size; 566 unsigned long start; 567 568 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 569 bmap_size = PFN_PHYS(bmap_size); 570 571 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 572 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 573 574 if (start + INITRD_SIZE > memory_end) { 575 printk("initrd extends beyond end of memory " 576 "(0x%08lx > 0x%08lx)\n" 577 "disabling initrd\n", 578 start + INITRD_SIZE, memory_end); 579 INITRD_START = INITRD_SIZE = 0; 580 } else { 581 printk("Moving initrd (0x%08lx -> 0x%08lx, " 582 "size: %ld)\n", 583 INITRD_START, start, INITRD_SIZE); 584 memmove((void *) start, (void *) INITRD_START, 585 INITRD_SIZE); 586 INITRD_START = start; 587 } 588 } 589 } 590 #endif 591 592 /* 593 * Initialize the boot-time allocator 594 */ 595 bootmap_size = init_bootmem(start_pfn, end_pfn); 596 597 /* 598 * Register RAM areas with the bootmem allocator. 599 */ 600 601 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 602 unsigned long start_chunk, end_chunk, pfn; 603 604 if (memory_chunk[i].type != CHUNK_READ_WRITE) 605 continue; 606 start_chunk = PFN_DOWN(memory_chunk[i].addr); 607 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1; 608 end_chunk = min(end_chunk, end_pfn); 609 if (start_chunk >= end_chunk) 610 continue; 611 add_active_range(0, start_chunk, end_chunk); 612 pfn = max(start_chunk, start_pfn); 613 for (; pfn <= end_chunk; pfn++) 614 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 615 } 616 617 psw_set_key(PAGE_DEFAULT_KEY); 618 619 free_bootmem_with_active_regions(0, max_pfn); 620 621 /* 622 * Reserve memory used for lowcore/command line/kernel image. 623 */ 624 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 625 reserve_bootmem((unsigned long)_stext, 626 PFN_PHYS(start_pfn) - (unsigned long)_stext, 627 BOOTMEM_DEFAULT); 628 /* 629 * Reserve the bootmem bitmap itself as well. We do this in two 630 * steps (first step was init_bootmem()) because this catches 631 * the (very unlikely) case of us accidentally initializing the 632 * bootmem allocator with an invalid RAM area. 633 */ 634 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 635 BOOTMEM_DEFAULT); 636 637 #ifdef CONFIG_BLK_DEV_INITRD 638 if (INITRD_START && INITRD_SIZE) { 639 if (INITRD_START + INITRD_SIZE <= memory_end) { 640 reserve_bootmem(INITRD_START, INITRD_SIZE, 641 BOOTMEM_DEFAULT); 642 initrd_start = INITRD_START; 643 initrd_end = initrd_start + INITRD_SIZE; 644 } else { 645 printk("initrd extends beyond end of memory " 646 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 647 initrd_start + INITRD_SIZE, memory_end); 648 initrd_start = initrd_end = 0; 649 } 650 } 651 #endif 652 } 653 654 static int __init __stfle(unsigned long long *list, int doublewords) 655 { 656 typedef struct { unsigned long long _[doublewords]; } addrtype; 657 register unsigned long __nr asm("0") = doublewords - 1; 658 659 asm volatile(".insn s,0xb2b00000,%0" /* stfle */ 660 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc"); 661 return __nr + 1; 662 } 663 664 int __init stfle(unsigned long long *list, int doublewords) 665 { 666 if (!(stfl() & (1UL << 24))) 667 return -EOPNOTSUPP; 668 return __stfle(list, doublewords); 669 } 670 671 /* 672 * Setup hardware capabilities. 673 */ 674 static void __init setup_hwcaps(void) 675 { 676 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 677 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; 678 unsigned long long facility_list_extended; 679 unsigned int facility_list; 680 int i; 681 682 facility_list = stfl(); 683 /* 684 * The store facility list bits numbers as found in the principles 685 * of operation are numbered with bit 1UL<<31 as number 0 to 686 * bit 1UL<<0 as number 31. 687 * Bit 0: instructions named N3, "backported" to esa-mode 688 * Bit 2: z/Architecture mode is active 689 * Bit 7: the store-facility-list-extended facility is installed 690 * Bit 17: the message-security assist is installed 691 * Bit 19: the long-displacement facility is installed 692 * Bit 21: the extended-immediate facility is installed 693 * These get translated to: 694 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 695 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 696 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5. 697 */ 698 for (i = 0; i < 6; i++) 699 if (facility_list & (1UL << (31 - stfl_bits[i]))) 700 elf_hwcap |= 1UL << i; 701 702 /* 703 * Check for additional facilities with store-facility-list-extended. 704 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 705 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 706 * as stored by stfl, bits 32-xxx contain additional facilities. 707 * How many facility words are stored depends on the number of 708 * doublewords passed to the instruction. The additional facilites 709 * are: 710 * Bit 43: decimal floating point facility is installed 711 * translated to: 712 * HWCAP_S390_DFP bit 6. 713 */ 714 if ((elf_hwcap & (1UL << 2)) && 715 __stfle(&facility_list_extended, 1) > 0) { 716 if (facility_list_extended & (1ULL << (64 - 43))) 717 elf_hwcap |= 1UL << 6; 718 } 719 720 if (MACHINE_HAS_HPAGE) 721 elf_hwcap |= 1UL << 7; 722 723 switch (cpuinfo->cpu_id.machine) { 724 case 0x9672: 725 #if !defined(CONFIG_64BIT) 726 default: /* Use "g5" as default for 31 bit kernels. */ 727 #endif 728 strcpy(elf_platform, "g5"); 729 break; 730 case 0x2064: 731 case 0x2066: 732 #if defined(CONFIG_64BIT) 733 default: /* Use "z900" as default for 64 bit kernels. */ 734 #endif 735 strcpy(elf_platform, "z900"); 736 break; 737 case 0x2084: 738 case 0x2086: 739 strcpy(elf_platform, "z990"); 740 break; 741 case 0x2094: 742 strcpy(elf_platform, "z9-109"); 743 break; 744 } 745 } 746 747 /* 748 * Setup function called from init/main.c just after the banner 749 * was printed. 750 */ 751 752 void __init 753 setup_arch(char **cmdline_p) 754 { 755 /* 756 * print what head.S has found out about the machine 757 */ 758 #ifndef CONFIG_64BIT 759 printk((MACHINE_IS_VM) ? 760 "We are running under VM (31 bit mode)\n" : 761 "We are running native (31 bit mode)\n"); 762 printk((MACHINE_HAS_IEEE) ? 763 "This machine has an IEEE fpu\n" : 764 "This machine has no IEEE fpu\n"); 765 #else /* CONFIG_64BIT */ 766 if (MACHINE_IS_VM) 767 printk("We are running under VM (64 bit mode)\n"); 768 else if (MACHINE_IS_KVM) { 769 printk("We are running under KVM (64 bit mode)\n"); 770 add_preferred_console("hvc", 0, NULL); 771 s390_virtio_console_init(); 772 } else 773 printk("We are running native (64 bit mode)\n"); 774 #endif /* CONFIG_64BIT */ 775 776 /* Have one command line that is parsed and saved in /proc/cmdline */ 777 /* boot_command_line has been already set up in early.c */ 778 *cmdline_p = boot_command_line; 779 780 ROOT_DEV = Root_RAM0; 781 782 init_mm.start_code = PAGE_OFFSET; 783 init_mm.end_code = (unsigned long) &_etext; 784 init_mm.end_data = (unsigned long) &_edata; 785 init_mm.brk = (unsigned long) &_end; 786 787 if (MACHINE_HAS_MVCOS) 788 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 789 else 790 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 791 792 parse_early_param(); 793 794 setup_ipl(); 795 setup_memory_end(); 796 setup_addressing_mode(); 797 setup_memory(); 798 setup_resources(); 799 setup_lowcore(); 800 801 cpu_init(); 802 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 803 s390_init_cpu_topology(); 804 805 /* 806 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 807 */ 808 setup_hwcaps(); 809 810 /* 811 * Create kernel page tables and switch to virtual addressing. 812 */ 813 paging_init(); 814 815 /* Setup default console */ 816 conmode_default(); 817 818 /* Setup zfcpdump support */ 819 setup_zfcpdump(console_devno); 820 } 821 822 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo) 823 { 824 printk(KERN_INFO "cpu %d " 825 #ifdef CONFIG_SMP 826 "phys_idx=%d " 827 #endif 828 "vers=%02X ident=%06X machine=%04X unused=%04X\n", 829 cpuinfo->cpu_nr, 830 #ifdef CONFIG_SMP 831 cpuinfo->cpu_addr, 832 #endif 833 cpuinfo->cpu_id.version, 834 cpuinfo->cpu_id.ident, 835 cpuinfo->cpu_id.machine, 836 cpuinfo->cpu_id.unused); 837 } 838 839 /* 840 * show_cpuinfo - Get information on one CPU for use by procfs. 841 */ 842 843 static int show_cpuinfo(struct seq_file *m, void *v) 844 { 845 static const char *hwcap_str[8] = { 846 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp", 847 "edat" 848 }; 849 struct cpuinfo_S390 *cpuinfo; 850 unsigned long n = (unsigned long) v - 1; 851 int i; 852 853 s390_adjust_jiffies(); 854 preempt_disable(); 855 if (!n) { 856 seq_printf(m, "vendor_id : IBM/S390\n" 857 "# processors : %i\n" 858 "bogomips per cpu: %lu.%02lu\n", 859 num_online_cpus(), loops_per_jiffy/(500000/HZ), 860 (loops_per_jiffy/(5000/HZ))%100); 861 seq_puts(m, "features\t: "); 862 for (i = 0; i < 8; i++) 863 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 864 seq_printf(m, "%s ", hwcap_str[i]); 865 seq_puts(m, "\n"); 866 } 867 868 if (cpu_online(n)) { 869 #ifdef CONFIG_SMP 870 if (smp_processor_id() == n) 871 cpuinfo = &S390_lowcore.cpu_data; 872 else 873 cpuinfo = &lowcore_ptr[n]->cpu_data; 874 #else 875 cpuinfo = &S390_lowcore.cpu_data; 876 #endif 877 seq_printf(m, "processor %li: " 878 "version = %02X, " 879 "identification = %06X, " 880 "machine = %04X\n", 881 n, cpuinfo->cpu_id.version, 882 cpuinfo->cpu_id.ident, 883 cpuinfo->cpu_id.machine); 884 } 885 preempt_enable(); 886 return 0; 887 } 888 889 static void *c_start(struct seq_file *m, loff_t *pos) 890 { 891 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; 892 } 893 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 894 { 895 ++*pos; 896 return c_start(m, pos); 897 } 898 static void c_stop(struct seq_file *m, void *v) 899 { 900 } 901 const struct seq_operations cpuinfo_op = { 902 .start = c_start, 903 .next = c_next, 904 .stop = c_stop, 905 .show = show_cpuinfo, 906 }; 907 908