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_GPL(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 78 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS]; 79 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ 80 static unsigned long __initdata memory_end; 81 82 /* 83 * This is set up by the setup-routine at boot-time 84 * for S390 need to find out, what we have to setup 85 * using address 0x10400 ... 86 */ 87 88 #include <asm/setup.h> 89 90 static struct resource code_resource = { 91 .name = "Kernel code", 92 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 93 }; 94 95 static struct resource data_resource = { 96 .name = "Kernel data", 97 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 98 }; 99 100 /* 101 * cpu_init() initializes state that is per-CPU. 102 */ 103 void __devinit cpu_init (void) 104 { 105 int addr = hard_smp_processor_id(); 106 107 /* 108 * Store processor id in lowcore (used e.g. in timer_interrupt) 109 */ 110 get_cpu_id(&S390_lowcore.cpu_data.cpu_id); 111 S390_lowcore.cpu_data.cpu_addr = addr; 112 113 /* 114 * Force FPU initialization: 115 */ 116 clear_thread_flag(TIF_USEDFPU); 117 clear_used_math(); 118 119 atomic_inc(&init_mm.mm_count); 120 current->active_mm = &init_mm; 121 if (current->mm) 122 BUG(); 123 enter_lazy_tlb(&init_mm, current); 124 } 125 126 /* 127 * VM halt and poweroff setup routines 128 */ 129 char vmhalt_cmd[128] = ""; 130 char vmpoff_cmd[128] = ""; 131 static char vmpanic_cmd[128] = ""; 132 133 static void strncpy_skip_quote(char *dst, char *src, int n) 134 { 135 int sx, dx; 136 137 dx = 0; 138 for (sx = 0; src[sx] != 0; sx++) { 139 if (src[sx] == '"') continue; 140 dst[dx++] = src[sx]; 141 if (dx >= n) break; 142 } 143 } 144 145 static int __init vmhalt_setup(char *str) 146 { 147 strncpy_skip_quote(vmhalt_cmd, str, 127); 148 vmhalt_cmd[127] = 0; 149 return 1; 150 } 151 152 __setup("vmhalt=", vmhalt_setup); 153 154 static int __init vmpoff_setup(char *str) 155 { 156 strncpy_skip_quote(vmpoff_cmd, str, 127); 157 vmpoff_cmd[127] = 0; 158 return 1; 159 } 160 161 __setup("vmpoff=", vmpoff_setup); 162 163 static int vmpanic_notify(struct notifier_block *self, unsigned long event, 164 void *data) 165 { 166 if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0) 167 cpcmd(vmpanic_cmd, NULL, 0, NULL); 168 169 return NOTIFY_OK; 170 } 171 172 #define PANIC_PRI_VMPANIC 0 173 174 static struct notifier_block vmpanic_nb = { 175 .notifier_call = vmpanic_notify, 176 .priority = PANIC_PRI_VMPANIC 177 }; 178 179 static int __init vmpanic_setup(char *str) 180 { 181 static int register_done __initdata = 0; 182 183 strncpy_skip_quote(vmpanic_cmd, str, 127); 184 vmpanic_cmd[127] = 0; 185 if (!register_done) { 186 register_done = 1; 187 atomic_notifier_chain_register(&panic_notifier_list, 188 &vmpanic_nb); 189 } 190 return 1; 191 } 192 193 __setup("vmpanic=", vmpanic_setup); 194 195 /* 196 * condev= and conmode= setup parameter. 197 */ 198 199 static int __init condev_setup(char *str) 200 { 201 int vdev; 202 203 vdev = simple_strtoul(str, &str, 0); 204 if (vdev >= 0 && vdev < 65536) { 205 console_devno = vdev; 206 console_irq = -1; 207 } 208 return 1; 209 } 210 211 __setup("condev=", condev_setup); 212 213 static int __init conmode_setup(char *str) 214 { 215 #if defined(CONFIG_SCLP_CONSOLE) 216 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 217 SET_CONSOLE_SCLP; 218 #endif 219 #if defined(CONFIG_TN3215_CONSOLE) 220 if (strncmp(str, "3215", 5) == 0) 221 SET_CONSOLE_3215; 222 #endif 223 #if defined(CONFIG_TN3270_CONSOLE) 224 if (strncmp(str, "3270", 5) == 0) 225 SET_CONSOLE_3270; 226 #endif 227 return 1; 228 } 229 230 __setup("conmode=", conmode_setup); 231 232 static void __init conmode_default(void) 233 { 234 char query_buffer[1024]; 235 char *ptr; 236 237 if (MACHINE_IS_VM) { 238 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 239 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 240 ptr = strstr(query_buffer, "SUBCHANNEL ="); 241 console_irq = simple_strtoul(ptr + 13, NULL, 16); 242 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 243 ptr = strstr(query_buffer, "CONMODE"); 244 /* 245 * Set the conmode to 3215 so that the device recognition 246 * will set the cu_type of the console to 3215. If the 247 * conmode is 3270 and we don't set it back then both 248 * 3215 and the 3270 driver will try to access the console 249 * device (3215 as console and 3270 as normal tty). 250 */ 251 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 252 if (ptr == NULL) { 253 #if defined(CONFIG_SCLP_CONSOLE) 254 SET_CONSOLE_SCLP; 255 #endif 256 return; 257 } 258 if (strncmp(ptr + 8, "3270", 4) == 0) { 259 #if defined(CONFIG_TN3270_CONSOLE) 260 SET_CONSOLE_3270; 261 #elif defined(CONFIG_TN3215_CONSOLE) 262 SET_CONSOLE_3215; 263 #elif defined(CONFIG_SCLP_CONSOLE) 264 SET_CONSOLE_SCLP; 265 #endif 266 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 267 #if defined(CONFIG_TN3215_CONSOLE) 268 SET_CONSOLE_3215; 269 #elif defined(CONFIG_TN3270_CONSOLE) 270 SET_CONSOLE_3270; 271 #elif defined(CONFIG_SCLP_CONSOLE) 272 SET_CONSOLE_SCLP; 273 #endif 274 } 275 } else if (MACHINE_IS_P390) { 276 #if defined(CONFIG_TN3215_CONSOLE) 277 SET_CONSOLE_3215; 278 #elif defined(CONFIG_TN3270_CONSOLE) 279 SET_CONSOLE_3270; 280 #endif 281 } else { 282 #if defined(CONFIG_SCLP_CONSOLE) 283 SET_CONSOLE_SCLP; 284 #endif 285 } 286 } 287 288 #ifdef CONFIG_SMP 289 void (*_machine_restart)(char *command) = machine_restart_smp; 290 void (*_machine_halt)(void) = machine_halt_smp; 291 void (*_machine_power_off)(void) = machine_power_off_smp; 292 #else 293 /* 294 * Reboot, halt and power_off routines for non SMP. 295 */ 296 static void do_machine_restart_nonsmp(char * __unused) 297 { 298 do_reipl(); 299 } 300 301 static void do_machine_halt_nonsmp(void) 302 { 303 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) 304 __cpcmd(vmhalt_cmd, NULL, 0, NULL); 305 signal_processor(smp_processor_id(), sigp_stop_and_store_status); 306 } 307 308 static void do_machine_power_off_nonsmp(void) 309 { 310 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) 311 __cpcmd(vmpoff_cmd, NULL, 0, NULL); 312 signal_processor(smp_processor_id(), sigp_stop_and_store_status); 313 } 314 315 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp; 316 void (*_machine_halt)(void) = do_machine_halt_nonsmp; 317 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp; 318 #endif 319 320 /* 321 * Reboot, halt and power_off stubs. They just call _machine_restart, 322 * _machine_halt or _machine_power_off. 323 */ 324 325 void machine_restart(char *command) 326 { 327 if (!in_interrupt() || oops_in_progress) 328 /* 329 * Only unblank the console if we are called in enabled 330 * context or a bust_spinlocks cleared the way for us. 331 */ 332 console_unblank(); 333 _machine_restart(command); 334 } 335 336 void machine_halt(void) 337 { 338 if (!in_interrupt() || oops_in_progress) 339 /* 340 * Only unblank the console if we are called in enabled 341 * context or a bust_spinlocks cleared the way for us. 342 */ 343 console_unblank(); 344 _machine_halt(); 345 } 346 347 void machine_power_off(void) 348 { 349 if (!in_interrupt() || oops_in_progress) 350 /* 351 * Only unblank the console if we are called in enabled 352 * context or a bust_spinlocks cleared the way for us. 353 */ 354 console_unblank(); 355 _machine_power_off(); 356 } 357 358 /* 359 * Dummy power off function. 360 */ 361 void (*pm_power_off)(void) = machine_power_off; 362 363 static int __init early_parse_mem(char *p) 364 { 365 memory_end = memparse(p, &p); 366 return 0; 367 } 368 early_param("mem", early_parse_mem); 369 370 /* 371 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes 372 */ 373 static int __init early_parse_ipldelay(char *p) 374 { 375 unsigned long delay = 0; 376 377 delay = simple_strtoul(p, &p, 0); 378 379 switch (*p) { 380 case 's': 381 case 'S': 382 delay *= 1000000; 383 break; 384 case 'm': 385 case 'M': 386 delay *= 60 * 1000000; 387 } 388 389 /* now wait for the requested amount of time */ 390 udelay(delay); 391 392 return 0; 393 } 394 early_param("ipldelay", early_parse_ipldelay); 395 396 #ifdef CONFIG_S390_SWITCH_AMODE 397 unsigned int switch_amode = 0; 398 EXPORT_SYMBOL_GPL(switch_amode); 399 400 static void set_amode_and_uaccess(unsigned long user_amode, 401 unsigned long user32_amode) 402 { 403 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 404 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 405 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 406 #ifdef CONFIG_COMPAT 407 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 408 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 409 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 410 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 411 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 412 PSW32_MASK_PSTATE; 413 #endif 414 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 415 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 416 417 if (MACHINE_HAS_MVCOS) { 418 printk("mvcos available.\n"); 419 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 420 } else { 421 printk("mvcos not available.\n"); 422 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 423 } 424 } 425 426 /* 427 * Switch kernel/user addressing modes? 428 */ 429 static int __init early_parse_switch_amode(char *p) 430 { 431 switch_amode = 1; 432 return 0; 433 } 434 early_param("switch_amode", early_parse_switch_amode); 435 436 #else /* CONFIG_S390_SWITCH_AMODE */ 437 static inline void set_amode_and_uaccess(unsigned long user_amode, 438 unsigned long user32_amode) 439 { 440 } 441 #endif /* CONFIG_S390_SWITCH_AMODE */ 442 443 #ifdef CONFIG_S390_EXEC_PROTECT 444 unsigned int s390_noexec = 0; 445 EXPORT_SYMBOL_GPL(s390_noexec); 446 447 /* 448 * Enable execute protection? 449 */ 450 static int __init early_parse_noexec(char *p) 451 { 452 if (!strncmp(p, "off", 3)) 453 return 0; 454 switch_amode = 1; 455 s390_noexec = 1; 456 return 0; 457 } 458 early_param("noexec", early_parse_noexec); 459 #endif /* CONFIG_S390_EXEC_PROTECT */ 460 461 static void setup_addressing_mode(void) 462 { 463 if (s390_noexec) { 464 printk("S390 execute protection active, "); 465 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY); 466 return; 467 } 468 if (switch_amode) { 469 printk("S390 address spaces switched, "); 470 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY); 471 } 472 } 473 474 static void __init 475 setup_lowcore(void) 476 { 477 struct _lowcore *lc; 478 int lc_pages; 479 480 /* 481 * Setup lowcore for boot cpu 482 */ 483 lc_pages = sizeof(void *) == 8 ? 2 : 1; 484 lc = (struct _lowcore *) 485 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 486 memset(lc, 0, lc_pages * PAGE_SIZE); 487 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 488 lc->restart_psw.addr = 489 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 490 if (switch_amode) 491 lc->restart_psw.mask |= PSW_ASC_HOME; 492 lc->external_new_psw.mask = psw_kernel_bits; 493 lc->external_new_psw.addr = 494 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 495 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 496 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 497 lc->program_new_psw.mask = psw_kernel_bits; 498 lc->program_new_psw.addr = 499 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 500 lc->mcck_new_psw.mask = 501 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 502 lc->mcck_new_psw.addr = 503 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 504 lc->io_new_psw.mask = psw_kernel_bits; 505 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 506 lc->ipl_device = S390_lowcore.ipl_device; 507 lc->jiffy_timer = -1LL; 508 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 509 lc->async_stack = (unsigned long) 510 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 511 lc->panic_stack = (unsigned long) 512 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 513 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 514 lc->thread_info = (unsigned long) &init_thread_union; 515 #ifndef CONFIG_64BIT 516 if (MACHINE_HAS_IEEE) { 517 lc->extended_save_area_addr = (__u32) 518 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 519 /* enable extended save area */ 520 __ctl_set_bit(14, 29); 521 } 522 #endif 523 set_prefix((u32)(unsigned long) lc); 524 } 525 526 static void __init 527 setup_resources(void) 528 { 529 struct resource *res, *sub_res; 530 int i; 531 532 code_resource.start = (unsigned long) &_text; 533 code_resource.end = (unsigned long) &_etext - 1; 534 data_resource.start = (unsigned long) &_etext; 535 data_resource.end = (unsigned long) &_edata - 1; 536 537 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 538 res = alloc_bootmem_low(sizeof(struct resource)); 539 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 540 switch (memory_chunk[i].type) { 541 case CHUNK_READ_WRITE: 542 res->name = "System RAM"; 543 break; 544 case CHUNK_READ_ONLY: 545 res->name = "System ROM"; 546 res->flags |= IORESOURCE_READONLY; 547 break; 548 default: 549 res->name = "reserved"; 550 } 551 res->start = memory_chunk[i].addr; 552 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 553 request_resource(&iomem_resource, res); 554 555 if (code_resource.start >= res->start && 556 code_resource.start <= res->end && 557 code_resource.end > res->end) { 558 sub_res = alloc_bootmem_low(sizeof(struct resource)); 559 memcpy(sub_res, &code_resource, 560 sizeof(struct resource)); 561 sub_res->end = res->end; 562 code_resource.start = res->end + 1; 563 request_resource(res, sub_res); 564 } 565 566 if (code_resource.start >= res->start && 567 code_resource.start <= res->end && 568 code_resource.end <= res->end) 569 request_resource(res, &code_resource); 570 571 if (data_resource.start >= res->start && 572 data_resource.start <= res->end && 573 data_resource.end > res->end) { 574 sub_res = alloc_bootmem_low(sizeof(struct resource)); 575 memcpy(sub_res, &data_resource, 576 sizeof(struct resource)); 577 sub_res->end = res->end; 578 data_resource.start = res->end + 1; 579 request_resource(res, sub_res); 580 } 581 582 if (data_resource.start >= res->start && 583 data_resource.start <= res->end && 584 data_resource.end <= res->end) 585 request_resource(res, &data_resource); 586 } 587 } 588 589 static void __init setup_memory_end(void) 590 { 591 unsigned long real_size, memory_size; 592 unsigned long max_mem, max_phys; 593 int i; 594 595 memory_size = real_size = 0; 596 max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE; 597 memory_end &= PAGE_MASK; 598 599 max_mem = memory_end ? min(max_phys, memory_end) : max_phys; 600 601 for (i = 0; i < MEMORY_CHUNKS; i++) { 602 struct mem_chunk *chunk = &memory_chunk[i]; 603 604 real_size = max(real_size, chunk->addr + chunk->size); 605 if (chunk->addr >= max_mem) { 606 memset(chunk, 0, sizeof(*chunk)); 607 continue; 608 } 609 if (chunk->addr + chunk->size > max_mem) 610 chunk->size = max_mem - chunk->addr; 611 memory_size = max(memory_size, chunk->addr + chunk->size); 612 } 613 if (!memory_end) 614 memory_end = memory_size; 615 } 616 617 static void __init 618 setup_memory(void) 619 { 620 unsigned long bootmap_size; 621 unsigned long start_pfn, end_pfn; 622 int i; 623 624 /* 625 * partially used pages are not usable - thus 626 * we are rounding upwards: 627 */ 628 start_pfn = PFN_UP(__pa(&_end)); 629 end_pfn = max_pfn = PFN_DOWN(memory_end); 630 631 #ifdef CONFIG_BLK_DEV_INITRD 632 /* 633 * Move the initrd in case the bitmap of the bootmem allocater 634 * would overwrite it. 635 */ 636 637 if (INITRD_START && INITRD_SIZE) { 638 unsigned long bmap_size; 639 unsigned long start; 640 641 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 642 bmap_size = PFN_PHYS(bmap_size); 643 644 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 645 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 646 647 if (start + INITRD_SIZE > memory_end) { 648 printk("initrd extends beyond end of memory " 649 "(0x%08lx > 0x%08lx)\n" 650 "disabling initrd\n", 651 start + INITRD_SIZE, memory_end); 652 INITRD_START = INITRD_SIZE = 0; 653 } else { 654 printk("Moving initrd (0x%08lx -> 0x%08lx, " 655 "size: %ld)\n", 656 INITRD_START, start, INITRD_SIZE); 657 memmove((void *) start, (void *) INITRD_START, 658 INITRD_SIZE); 659 INITRD_START = start; 660 } 661 } 662 } 663 #endif 664 665 /* 666 * Initialize the boot-time allocator 667 */ 668 bootmap_size = init_bootmem(start_pfn, end_pfn); 669 670 /* 671 * Register RAM areas with the bootmem allocator. 672 */ 673 674 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 675 unsigned long start_chunk, end_chunk, pfn; 676 677 if (memory_chunk[i].type != CHUNK_READ_WRITE) 678 continue; 679 start_chunk = PFN_DOWN(memory_chunk[i].addr); 680 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1; 681 end_chunk = min(end_chunk, end_pfn); 682 if (start_chunk >= end_chunk) 683 continue; 684 add_active_range(0, start_chunk, end_chunk); 685 pfn = max(start_chunk, start_pfn); 686 for (; pfn <= end_chunk; pfn++) 687 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 688 } 689 690 psw_set_key(PAGE_DEFAULT_KEY); 691 692 free_bootmem_with_active_regions(0, max_pfn); 693 694 /* 695 * Reserve memory used for lowcore/command line/kernel image. 696 */ 697 reserve_bootmem(0, (unsigned long)_ehead); 698 reserve_bootmem((unsigned long)_stext, 699 PFN_PHYS(start_pfn) - (unsigned long)_stext); 700 /* 701 * Reserve the bootmem bitmap itself as well. We do this in two 702 * steps (first step was init_bootmem()) because this catches 703 * the (very unlikely) case of us accidentally initializing the 704 * bootmem allocator with an invalid RAM area. 705 */ 706 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size); 707 708 #ifdef CONFIG_BLK_DEV_INITRD 709 if (INITRD_START && INITRD_SIZE) { 710 if (INITRD_START + INITRD_SIZE <= memory_end) { 711 reserve_bootmem(INITRD_START, INITRD_SIZE); 712 initrd_start = INITRD_START; 713 initrd_end = initrd_start + INITRD_SIZE; 714 } else { 715 printk("initrd extends beyond end of memory " 716 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 717 initrd_start + INITRD_SIZE, memory_end); 718 initrd_start = initrd_end = 0; 719 } 720 } 721 #endif 722 } 723 724 /* 725 * Setup function called from init/main.c just after the banner 726 * was printed. 727 */ 728 729 void __init 730 setup_arch(char **cmdline_p) 731 { 732 /* 733 * print what head.S has found out about the machine 734 */ 735 #ifndef CONFIG_64BIT 736 printk((MACHINE_IS_VM) ? 737 "We are running under VM (31 bit mode)\n" : 738 "We are running native (31 bit mode)\n"); 739 printk((MACHINE_HAS_IEEE) ? 740 "This machine has an IEEE fpu\n" : 741 "This machine has no IEEE fpu\n"); 742 #else /* CONFIG_64BIT */ 743 printk((MACHINE_IS_VM) ? 744 "We are running under VM (64 bit mode)\n" : 745 "We are running native (64 bit mode)\n"); 746 #endif /* CONFIG_64BIT */ 747 748 /* Save unparsed command line copy for /proc/cmdline */ 749 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 750 751 *cmdline_p = COMMAND_LINE; 752 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0'; 753 754 ROOT_DEV = Root_RAM0; 755 756 init_mm.start_code = PAGE_OFFSET; 757 init_mm.end_code = (unsigned long) &_etext; 758 init_mm.end_data = (unsigned long) &_edata; 759 init_mm.brk = (unsigned long) &_end; 760 761 if (MACHINE_HAS_MVCOS) 762 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 763 else 764 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 765 766 parse_early_param(); 767 768 setup_memory_end(); 769 setup_addressing_mode(); 770 setup_memory(); 771 setup_resources(); 772 setup_lowcore(); 773 774 cpu_init(); 775 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 776 smp_setup_cpu_possible_map(); 777 778 /* 779 * Create kernel page tables and switch to virtual addressing. 780 */ 781 paging_init(); 782 783 /* Setup default console */ 784 conmode_default(); 785 } 786 787 void print_cpu_info(struct cpuinfo_S390 *cpuinfo) 788 { 789 printk("cpu %d " 790 #ifdef CONFIG_SMP 791 "phys_idx=%d " 792 #endif 793 "vers=%02X ident=%06X machine=%04X unused=%04X\n", 794 cpuinfo->cpu_nr, 795 #ifdef CONFIG_SMP 796 cpuinfo->cpu_addr, 797 #endif 798 cpuinfo->cpu_id.version, 799 cpuinfo->cpu_id.ident, 800 cpuinfo->cpu_id.machine, 801 cpuinfo->cpu_id.unused); 802 } 803 804 /* 805 * show_cpuinfo - Get information on one CPU for use by procfs. 806 */ 807 808 static int show_cpuinfo(struct seq_file *m, void *v) 809 { 810 struct cpuinfo_S390 *cpuinfo; 811 unsigned long n = (unsigned long) v - 1; 812 813 s390_adjust_jiffies(); 814 preempt_disable(); 815 if (!n) { 816 seq_printf(m, "vendor_id : IBM/S390\n" 817 "# processors : %i\n" 818 "bogomips per cpu: %lu.%02lu\n", 819 num_online_cpus(), loops_per_jiffy/(500000/HZ), 820 (loops_per_jiffy/(5000/HZ))%100); 821 } 822 if (cpu_online(n)) { 823 #ifdef CONFIG_SMP 824 if (smp_processor_id() == n) 825 cpuinfo = &S390_lowcore.cpu_data; 826 else 827 cpuinfo = &lowcore_ptr[n]->cpu_data; 828 #else 829 cpuinfo = &S390_lowcore.cpu_data; 830 #endif 831 seq_printf(m, "processor %li: " 832 "version = %02X, " 833 "identification = %06X, " 834 "machine = %04X\n", 835 n, cpuinfo->cpu_id.version, 836 cpuinfo->cpu_id.ident, 837 cpuinfo->cpu_id.machine); 838 } 839 preempt_enable(); 840 return 0; 841 } 842 843 static void *c_start(struct seq_file *m, loff_t *pos) 844 { 845 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; 846 } 847 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 848 { 849 ++*pos; 850 return c_start(m, pos); 851 } 852 static void c_stop(struct seq_file *m, void *v) 853 { 854 } 855 struct seq_operations cpuinfo_op = { 856 .start = c_start, 857 .next = c_next, 858 .stop = c_stop, 859 .show = show_cpuinfo, 860 }; 861 862