1 /* 2 * arch/s390/kernel/setup.c 3 * 4 * S390 version 5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * Author(s): Hartmut Penner (hp@de.ibm.com), 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 * 9 * Derived from "arch/i386/kernel/setup.c" 10 * Copyright (C) 1995, Linus Torvalds 11 */ 12 13 /* 14 * This file handles the architecture-dependent parts of initialization 15 */ 16 17 #include <linux/errno.h> 18 #include <linux/module.h> 19 #include <linux/sched.h> 20 #include <linux/kernel.h> 21 #include <linux/mm.h> 22 #include <linux/stddef.h> 23 #include <linux/unistd.h> 24 #include <linux/ptrace.h> 25 #include <linux/slab.h> 26 #include <linux/user.h> 27 #include <linux/a.out.h> 28 #include <linux/tty.h> 29 #include <linux/ioport.h> 30 #include <linux/delay.h> 31 #include <linux/init.h> 32 #include <linux/initrd.h> 33 #include <linux/bootmem.h> 34 #include <linux/root_dev.h> 35 #include <linux/console.h> 36 #include <linux/seq_file.h> 37 #include <linux/kernel_stat.h> 38 #include <linux/device.h> 39 #include <linux/notifier.h> 40 #include <linux/pfn.h> 41 #include <linux/ctype.h> 42 #include <linux/reboot.h> 43 44 #include <asm/ipl.h> 45 #include <asm/uaccess.h> 46 #include <asm/system.h> 47 #include <asm/smp.h> 48 #include <asm/mmu_context.h> 49 #include <asm/cpcmd.h> 50 #include <asm/lowcore.h> 51 #include <asm/irq.h> 52 #include <asm/page.h> 53 #include <asm/ptrace.h> 54 #include <asm/sections.h> 55 #include <asm/ebcdic.h> 56 #include <asm/compat.h> 57 58 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY | 59 PSW_MASK_MCHECK | PSW_DEFAULT_KEY); 60 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 61 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 62 PSW_MASK_PSTATE | PSW_DEFAULT_KEY); 63 64 /* 65 * User copy operations. 66 */ 67 struct uaccess_ops uaccess; 68 EXPORT_SYMBOL(uaccess); 69 70 /* 71 * Machine setup.. 72 */ 73 unsigned int console_mode = 0; 74 unsigned int console_devno = -1; 75 unsigned int console_irq = -1; 76 unsigned long machine_flags = 0; 77 unsigned long elf_hwcap = 0; 78 char elf_platform[ELF_PLATFORM_SIZE]; 79 80 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS]; 81 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ 82 static unsigned long __initdata memory_end; 83 84 /* 85 * This is set up by the setup-routine at boot-time 86 * for S390 need to find out, what we have to setup 87 * using address 0x10400 ... 88 */ 89 90 #include <asm/setup.h> 91 92 static struct resource code_resource = { 93 .name = "Kernel code", 94 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 95 }; 96 97 static struct resource data_resource = { 98 .name = "Kernel data", 99 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 100 }; 101 102 /* 103 * cpu_init() initializes state that is per-CPU. 104 */ 105 void __cpuinit cpu_init(void) 106 { 107 int addr = hard_smp_processor_id(); 108 109 /* 110 * Store processor id in lowcore (used e.g. in timer_interrupt) 111 */ 112 get_cpu_id(&S390_lowcore.cpu_data.cpu_id); 113 S390_lowcore.cpu_data.cpu_addr = addr; 114 115 /* 116 * Force FPU initialization: 117 */ 118 clear_thread_flag(TIF_USEDFPU); 119 clear_used_math(); 120 121 atomic_inc(&init_mm.mm_count); 122 current->active_mm = &init_mm; 123 if (current->mm) 124 BUG(); 125 enter_lazy_tlb(&init_mm, current); 126 } 127 128 /* 129 * VM halt and poweroff setup routines 130 */ 131 char vmhalt_cmd[128] = ""; 132 char vmpoff_cmd[128] = ""; 133 static char vmpanic_cmd[128] = ""; 134 135 static void strncpy_skip_quote(char *dst, char *src, int n) 136 { 137 int sx, dx; 138 139 dx = 0; 140 for (sx = 0; src[sx] != 0; sx++) { 141 if (src[sx] == '"') continue; 142 dst[dx++] = src[sx]; 143 if (dx >= n) break; 144 } 145 } 146 147 static int __init vmhalt_setup(char *str) 148 { 149 strncpy_skip_quote(vmhalt_cmd, str, 127); 150 vmhalt_cmd[127] = 0; 151 return 1; 152 } 153 154 __setup("vmhalt=", vmhalt_setup); 155 156 static int __init vmpoff_setup(char *str) 157 { 158 strncpy_skip_quote(vmpoff_cmd, str, 127); 159 vmpoff_cmd[127] = 0; 160 return 1; 161 } 162 163 __setup("vmpoff=", vmpoff_setup); 164 165 static int vmpanic_notify(struct notifier_block *self, unsigned long event, 166 void *data) 167 { 168 if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0) 169 cpcmd(vmpanic_cmd, NULL, 0, NULL); 170 171 return NOTIFY_OK; 172 } 173 174 #define PANIC_PRI_VMPANIC 0 175 176 static struct notifier_block vmpanic_nb = { 177 .notifier_call = vmpanic_notify, 178 .priority = PANIC_PRI_VMPANIC 179 }; 180 181 static int __init vmpanic_setup(char *str) 182 { 183 static int register_done __initdata = 0; 184 185 strncpy_skip_quote(vmpanic_cmd, str, 127); 186 vmpanic_cmd[127] = 0; 187 if (!register_done) { 188 register_done = 1; 189 atomic_notifier_chain_register(&panic_notifier_list, 190 &vmpanic_nb); 191 } 192 return 1; 193 } 194 195 __setup("vmpanic=", vmpanic_setup); 196 197 /* 198 * condev= and conmode= setup parameter. 199 */ 200 201 static int __init condev_setup(char *str) 202 { 203 int vdev; 204 205 vdev = simple_strtoul(str, &str, 0); 206 if (vdev >= 0 && vdev < 65536) { 207 console_devno = vdev; 208 console_irq = -1; 209 } 210 return 1; 211 } 212 213 __setup("condev=", condev_setup); 214 215 static int __init conmode_setup(char *str) 216 { 217 #if defined(CONFIG_SCLP_CONSOLE) 218 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 219 SET_CONSOLE_SCLP; 220 #endif 221 #if defined(CONFIG_TN3215_CONSOLE) 222 if (strncmp(str, "3215", 5) == 0) 223 SET_CONSOLE_3215; 224 #endif 225 #if defined(CONFIG_TN3270_CONSOLE) 226 if (strncmp(str, "3270", 5) == 0) 227 SET_CONSOLE_3270; 228 #endif 229 return 1; 230 } 231 232 __setup("conmode=", conmode_setup); 233 234 static void __init conmode_default(void) 235 { 236 char query_buffer[1024]; 237 char *ptr; 238 239 if (MACHINE_IS_VM) { 240 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 241 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 242 ptr = strstr(query_buffer, "SUBCHANNEL ="); 243 console_irq = simple_strtoul(ptr + 13, NULL, 16); 244 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 245 ptr = strstr(query_buffer, "CONMODE"); 246 /* 247 * Set the conmode to 3215 so that the device recognition 248 * will set the cu_type of the console to 3215. If the 249 * conmode is 3270 and we don't set it back then both 250 * 3215 and the 3270 driver will try to access the console 251 * device (3215 as console and 3270 as normal tty). 252 */ 253 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 254 if (ptr == NULL) { 255 #if defined(CONFIG_SCLP_CONSOLE) 256 SET_CONSOLE_SCLP; 257 #endif 258 return; 259 } 260 if (strncmp(ptr + 8, "3270", 4) == 0) { 261 #if defined(CONFIG_TN3270_CONSOLE) 262 SET_CONSOLE_3270; 263 #elif defined(CONFIG_TN3215_CONSOLE) 264 SET_CONSOLE_3215; 265 #elif defined(CONFIG_SCLP_CONSOLE) 266 SET_CONSOLE_SCLP; 267 #endif 268 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 269 #if defined(CONFIG_TN3215_CONSOLE) 270 SET_CONSOLE_3215; 271 #elif defined(CONFIG_TN3270_CONSOLE) 272 SET_CONSOLE_3270; 273 #elif defined(CONFIG_SCLP_CONSOLE) 274 SET_CONSOLE_SCLP; 275 #endif 276 } 277 } else if (MACHINE_IS_P390) { 278 #if defined(CONFIG_TN3215_CONSOLE) 279 SET_CONSOLE_3215; 280 #elif defined(CONFIG_TN3270_CONSOLE) 281 SET_CONSOLE_3270; 282 #endif 283 } else { 284 #if defined(CONFIG_SCLP_CONSOLE) 285 SET_CONSOLE_SCLP; 286 #endif 287 } 288 } 289 290 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 291 static void __init setup_zfcpdump(unsigned int console_devno) 292 { 293 static char str[64]; 294 295 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 296 return; 297 if (console_devno != -1) 298 sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x", 299 ipl_info.data.fcp.dev_id.devno, console_devno); 300 else 301 sprintf(str, "cio_ignore=all,!0.0.%04x", 302 ipl_info.data.fcp.dev_id.devno); 303 strcat(COMMAND_LINE, str); 304 console_loglevel = 2; 305 } 306 #else 307 static inline void setup_zfcpdump(unsigned int console_devno) {} 308 #endif /* CONFIG_ZFCPDUMP */ 309 310 #ifdef CONFIG_SMP 311 void (*_machine_restart)(char *command) = machine_restart_smp; 312 void (*_machine_halt)(void) = machine_halt_smp; 313 void (*_machine_power_off)(void) = machine_power_off_smp; 314 #else 315 /* 316 * Reboot, halt and power_off routines for non SMP. 317 */ 318 static void do_machine_restart_nonsmp(char * __unused) 319 { 320 do_reipl(); 321 } 322 323 static void do_machine_halt_nonsmp(void) 324 { 325 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) 326 __cpcmd(vmhalt_cmd, NULL, 0, NULL); 327 signal_processor(smp_processor_id(), sigp_stop_and_store_status); 328 } 329 330 static void do_machine_power_off_nonsmp(void) 331 { 332 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) 333 __cpcmd(vmpoff_cmd, NULL, 0, NULL); 334 signal_processor(smp_processor_id(), sigp_stop_and_store_status); 335 } 336 337 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp; 338 void (*_machine_halt)(void) = do_machine_halt_nonsmp; 339 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp; 340 #endif 341 342 /* 343 * Reboot, halt and power_off stubs. They just call _machine_restart, 344 * _machine_halt or _machine_power_off. 345 */ 346 347 void machine_restart(char *command) 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_restart(command); 356 } 357 358 void machine_halt(void) 359 { 360 if (!in_interrupt() || oops_in_progress) 361 /* 362 * Only unblank the console if we are called in enabled 363 * context or a bust_spinlocks cleared the way for us. 364 */ 365 console_unblank(); 366 _machine_halt(); 367 } 368 369 void machine_power_off(void) 370 { 371 if (!in_interrupt() || oops_in_progress) 372 /* 373 * Only unblank the console if we are called in enabled 374 * context or a bust_spinlocks cleared the way for us. 375 */ 376 console_unblank(); 377 _machine_power_off(); 378 } 379 380 /* 381 * Dummy power off function. 382 */ 383 void (*pm_power_off)(void) = machine_power_off; 384 385 static int __init early_parse_mem(char *p) 386 { 387 memory_end = memparse(p, &p); 388 return 0; 389 } 390 early_param("mem", early_parse_mem); 391 392 /* 393 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes 394 */ 395 static int __init early_parse_ipldelay(char *p) 396 { 397 unsigned long delay = 0; 398 399 delay = simple_strtoul(p, &p, 0); 400 401 switch (*p) { 402 case 's': 403 case 'S': 404 delay *= 1000000; 405 break; 406 case 'm': 407 case 'M': 408 delay *= 60 * 1000000; 409 } 410 411 /* now wait for the requested amount of time */ 412 udelay(delay); 413 414 return 0; 415 } 416 early_param("ipldelay", early_parse_ipldelay); 417 418 #ifdef CONFIG_S390_SWITCH_AMODE 419 unsigned int switch_amode = 0; 420 EXPORT_SYMBOL_GPL(switch_amode); 421 422 static void set_amode_and_uaccess(unsigned long user_amode, 423 unsigned long user32_amode) 424 { 425 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 426 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 427 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 428 #ifdef CONFIG_COMPAT 429 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 430 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 431 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 432 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 433 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 434 PSW32_MASK_PSTATE; 435 #endif 436 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 437 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 438 439 if (MACHINE_HAS_MVCOS) { 440 printk("mvcos available.\n"); 441 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 442 } else { 443 printk("mvcos not available.\n"); 444 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 445 } 446 } 447 448 /* 449 * Switch kernel/user addressing modes? 450 */ 451 static int __init early_parse_switch_amode(char *p) 452 { 453 switch_amode = 1; 454 return 0; 455 } 456 early_param("switch_amode", early_parse_switch_amode); 457 458 #else /* CONFIG_S390_SWITCH_AMODE */ 459 static inline void set_amode_and_uaccess(unsigned long user_amode, 460 unsigned long user32_amode) 461 { 462 } 463 #endif /* CONFIG_S390_SWITCH_AMODE */ 464 465 #ifdef CONFIG_S390_EXEC_PROTECT 466 unsigned int s390_noexec = 0; 467 EXPORT_SYMBOL_GPL(s390_noexec); 468 469 /* 470 * Enable execute protection? 471 */ 472 static int __init early_parse_noexec(char *p) 473 { 474 if (!strncmp(p, "off", 3)) 475 return 0; 476 switch_amode = 1; 477 s390_noexec = 1; 478 return 0; 479 } 480 early_param("noexec", early_parse_noexec); 481 #endif /* CONFIG_S390_EXEC_PROTECT */ 482 483 static void setup_addressing_mode(void) 484 { 485 if (s390_noexec) { 486 printk("S390 execute protection active, "); 487 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY); 488 return; 489 } 490 if (switch_amode) { 491 printk("S390 address spaces switched, "); 492 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY); 493 } 494 } 495 496 static void __init 497 setup_lowcore(void) 498 { 499 struct _lowcore *lc; 500 int lc_pages; 501 502 /* 503 * Setup lowcore for boot cpu 504 */ 505 lc_pages = sizeof(void *) == 8 ? 2 : 1; 506 lc = (struct _lowcore *) 507 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 508 memset(lc, 0, lc_pages * PAGE_SIZE); 509 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 510 lc->restart_psw.addr = 511 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 512 if (switch_amode) 513 lc->restart_psw.mask |= PSW_ASC_HOME; 514 lc->external_new_psw.mask = psw_kernel_bits; 515 lc->external_new_psw.addr = 516 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 517 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 518 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 519 lc->program_new_psw.mask = psw_kernel_bits; 520 lc->program_new_psw.addr = 521 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 522 lc->mcck_new_psw.mask = 523 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 524 lc->mcck_new_psw.addr = 525 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 526 lc->io_new_psw.mask = psw_kernel_bits; 527 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 528 lc->ipl_device = S390_lowcore.ipl_device; 529 lc->jiffy_timer = -1LL; 530 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 531 lc->async_stack = (unsigned long) 532 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 533 lc->panic_stack = (unsigned long) 534 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 535 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 536 lc->thread_info = (unsigned long) &init_thread_union; 537 #ifndef CONFIG_64BIT 538 if (MACHINE_HAS_IEEE) { 539 lc->extended_save_area_addr = (__u32) 540 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 541 /* enable extended save area */ 542 __ctl_set_bit(14, 29); 543 } 544 #endif 545 set_prefix((u32)(unsigned long) lc); 546 } 547 548 static void __init 549 setup_resources(void) 550 { 551 struct resource *res, *sub_res; 552 int i; 553 554 code_resource.start = (unsigned long) &_text; 555 code_resource.end = (unsigned long) &_etext - 1; 556 data_resource.start = (unsigned long) &_etext; 557 data_resource.end = (unsigned long) &_edata - 1; 558 559 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 560 res = alloc_bootmem_low(sizeof(struct resource)); 561 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 562 switch (memory_chunk[i].type) { 563 case CHUNK_READ_WRITE: 564 res->name = "System RAM"; 565 break; 566 case CHUNK_READ_ONLY: 567 res->name = "System ROM"; 568 res->flags |= IORESOURCE_READONLY; 569 break; 570 default: 571 res->name = "reserved"; 572 } 573 res->start = memory_chunk[i].addr; 574 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 575 request_resource(&iomem_resource, res); 576 577 if (code_resource.start >= res->start && 578 code_resource.start <= res->end && 579 code_resource.end > res->end) { 580 sub_res = alloc_bootmem_low(sizeof(struct resource)); 581 memcpy(sub_res, &code_resource, 582 sizeof(struct resource)); 583 sub_res->end = res->end; 584 code_resource.start = res->end + 1; 585 request_resource(res, sub_res); 586 } 587 588 if (code_resource.start >= res->start && 589 code_resource.start <= res->end && 590 code_resource.end <= res->end) 591 request_resource(res, &code_resource); 592 593 if (data_resource.start >= res->start && 594 data_resource.start <= res->end && 595 data_resource.end > res->end) { 596 sub_res = alloc_bootmem_low(sizeof(struct resource)); 597 memcpy(sub_res, &data_resource, 598 sizeof(struct resource)); 599 sub_res->end = res->end; 600 data_resource.start = res->end + 1; 601 request_resource(res, sub_res); 602 } 603 604 if (data_resource.start >= res->start && 605 data_resource.start <= res->end && 606 data_resource.end <= res->end) 607 request_resource(res, &data_resource); 608 } 609 } 610 611 unsigned long real_memory_size; 612 EXPORT_SYMBOL_GPL(real_memory_size); 613 614 static void __init setup_memory_end(void) 615 { 616 unsigned long memory_size; 617 unsigned long max_mem, max_phys; 618 int i; 619 620 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 621 if (ipl_info.type == IPL_TYPE_FCP_DUMP) 622 memory_end = ZFCPDUMP_HSA_SIZE; 623 #endif 624 memory_size = 0; 625 max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE; 626 memory_end &= PAGE_MASK; 627 628 max_mem = memory_end ? min(max_phys, memory_end) : max_phys; 629 630 for (i = 0; i < MEMORY_CHUNKS; i++) { 631 struct mem_chunk *chunk = &memory_chunk[i]; 632 633 real_memory_size = max(real_memory_size, 634 chunk->addr + chunk->size); 635 if (chunk->addr >= max_mem) { 636 memset(chunk, 0, sizeof(*chunk)); 637 continue; 638 } 639 if (chunk->addr + chunk->size > max_mem) 640 chunk->size = max_mem - chunk->addr; 641 memory_size = max(memory_size, chunk->addr + chunk->size); 642 } 643 if (!memory_end) 644 memory_end = memory_size; 645 } 646 647 static void __init 648 setup_memory(void) 649 { 650 unsigned long bootmap_size; 651 unsigned long start_pfn, end_pfn; 652 int i; 653 654 /* 655 * partially used pages are not usable - thus 656 * we are rounding upwards: 657 */ 658 start_pfn = PFN_UP(__pa(&_end)); 659 end_pfn = max_pfn = PFN_DOWN(memory_end); 660 661 #ifdef CONFIG_BLK_DEV_INITRD 662 /* 663 * Move the initrd in case the bitmap of the bootmem allocater 664 * would overwrite it. 665 */ 666 667 if (INITRD_START && INITRD_SIZE) { 668 unsigned long bmap_size; 669 unsigned long start; 670 671 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 672 bmap_size = PFN_PHYS(bmap_size); 673 674 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 675 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 676 677 if (start + INITRD_SIZE > memory_end) { 678 printk("initrd extends beyond end of memory " 679 "(0x%08lx > 0x%08lx)\n" 680 "disabling initrd\n", 681 start + INITRD_SIZE, memory_end); 682 INITRD_START = INITRD_SIZE = 0; 683 } else { 684 printk("Moving initrd (0x%08lx -> 0x%08lx, " 685 "size: %ld)\n", 686 INITRD_START, start, INITRD_SIZE); 687 memmove((void *) start, (void *) INITRD_START, 688 INITRD_SIZE); 689 INITRD_START = start; 690 } 691 } 692 } 693 #endif 694 695 /* 696 * Initialize the boot-time allocator 697 */ 698 bootmap_size = init_bootmem(start_pfn, end_pfn); 699 700 /* 701 * Register RAM areas with the bootmem allocator. 702 */ 703 704 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 705 unsigned long start_chunk, end_chunk, pfn; 706 707 if (memory_chunk[i].type != CHUNK_READ_WRITE) 708 continue; 709 start_chunk = PFN_DOWN(memory_chunk[i].addr); 710 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1; 711 end_chunk = min(end_chunk, end_pfn); 712 if (start_chunk >= end_chunk) 713 continue; 714 add_active_range(0, start_chunk, end_chunk); 715 pfn = max(start_chunk, start_pfn); 716 for (; pfn <= end_chunk; pfn++) 717 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 718 } 719 720 psw_set_key(PAGE_DEFAULT_KEY); 721 722 free_bootmem_with_active_regions(0, max_pfn); 723 724 /* 725 * Reserve memory used for lowcore/command line/kernel image. 726 */ 727 reserve_bootmem(0, (unsigned long)_ehead); 728 reserve_bootmem((unsigned long)_stext, 729 PFN_PHYS(start_pfn) - (unsigned long)_stext); 730 /* 731 * Reserve the bootmem bitmap itself as well. We do this in two 732 * steps (first step was init_bootmem()) because this catches 733 * the (very unlikely) case of us accidentally initializing the 734 * bootmem allocator with an invalid RAM area. 735 */ 736 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size); 737 738 #ifdef CONFIG_BLK_DEV_INITRD 739 if (INITRD_START && INITRD_SIZE) { 740 if (INITRD_START + INITRD_SIZE <= memory_end) { 741 reserve_bootmem(INITRD_START, INITRD_SIZE); 742 initrd_start = INITRD_START; 743 initrd_end = initrd_start + INITRD_SIZE; 744 } else { 745 printk("initrd extends beyond end of memory " 746 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 747 initrd_start + INITRD_SIZE, memory_end); 748 initrd_start = initrd_end = 0; 749 } 750 } 751 #endif 752 } 753 754 static __init unsigned int stfl(void) 755 { 756 asm volatile( 757 " .insn s,0xb2b10000,0(0)\n" /* stfl */ 758 "0:\n" 759 EX_TABLE(0b,0b)); 760 return S390_lowcore.stfl_fac_list; 761 } 762 763 static __init int stfle(unsigned long long *list, int doublewords) 764 { 765 typedef struct { unsigned long long _[doublewords]; } addrtype; 766 register unsigned long __nr asm("0") = doublewords - 1; 767 768 asm volatile(".insn s,0xb2b00000,%0" /* stfle */ 769 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc"); 770 return __nr + 1; 771 } 772 773 /* 774 * Setup hardware capabilities. 775 */ 776 static void __init setup_hwcaps(void) 777 { 778 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 779 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; 780 unsigned long long facility_list_extended; 781 unsigned int facility_list; 782 int i; 783 784 facility_list = stfl(); 785 /* 786 * The store facility list bits numbers as found in the principles 787 * of operation are numbered with bit 1UL<<31 as number 0 to 788 * bit 1UL<<0 as number 31. 789 * Bit 0: instructions named N3, "backported" to esa-mode 790 * Bit 2: z/Architecture mode is active 791 * Bit 7: the store-facility-list-extended facility is installed 792 * Bit 17: the message-security assist is installed 793 * Bit 19: the long-displacement facility is installed 794 * Bit 21: the extended-immediate facility is installed 795 * These get translated to: 796 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 797 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 798 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5. 799 */ 800 for (i = 0; i < 6; i++) 801 if (facility_list & (1UL << (31 - stfl_bits[i]))) 802 elf_hwcap |= 1UL << i; 803 804 /* 805 * Check for additional facilities with store-facility-list-extended. 806 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 807 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 808 * as stored by stfl, bits 32-xxx contain additional facilities. 809 * How many facility words are stored depends on the number of 810 * doublewords passed to the instruction. The additional facilites 811 * are: 812 * Bit 43: decimal floating point facility is installed 813 * translated to: 814 * HWCAP_S390_DFP bit 6. 815 */ 816 if ((elf_hwcap & (1UL << 2)) && 817 stfle(&facility_list_extended, 1) > 0) { 818 if (facility_list_extended & (1ULL << (64 - 43))) 819 elf_hwcap |= 1UL << 6; 820 } 821 822 switch (cpuinfo->cpu_id.machine) { 823 case 0x9672: 824 #if !defined(CONFIG_64BIT) 825 default: /* Use "g5" as default for 31 bit kernels. */ 826 #endif 827 strcpy(elf_platform, "g5"); 828 break; 829 case 0x2064: 830 case 0x2066: 831 #if defined(CONFIG_64BIT) 832 default: /* Use "z900" as default for 64 bit kernels. */ 833 #endif 834 strcpy(elf_platform, "z900"); 835 break; 836 case 0x2084: 837 case 0x2086: 838 strcpy(elf_platform, "z990"); 839 break; 840 case 0x2094: 841 strcpy(elf_platform, "z9-109"); 842 break; 843 } 844 } 845 846 /* 847 * Setup function called from init/main.c just after the banner 848 * was printed. 849 */ 850 851 void __init 852 setup_arch(char **cmdline_p) 853 { 854 /* 855 * print what head.S has found out about the machine 856 */ 857 #ifndef CONFIG_64BIT 858 printk((MACHINE_IS_VM) ? 859 "We are running under VM (31 bit mode)\n" : 860 "We are running native (31 bit mode)\n"); 861 printk((MACHINE_HAS_IEEE) ? 862 "This machine has an IEEE fpu\n" : 863 "This machine has no IEEE fpu\n"); 864 #else /* CONFIG_64BIT */ 865 printk((MACHINE_IS_VM) ? 866 "We are running under VM (64 bit mode)\n" : 867 "We are running native (64 bit mode)\n"); 868 #endif /* CONFIG_64BIT */ 869 870 /* Save unparsed command line copy for /proc/cmdline */ 871 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 872 873 *cmdline_p = COMMAND_LINE; 874 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0'; 875 876 ROOT_DEV = Root_RAM0; 877 878 init_mm.start_code = PAGE_OFFSET; 879 init_mm.end_code = (unsigned long) &_etext; 880 init_mm.end_data = (unsigned long) &_edata; 881 init_mm.brk = (unsigned long) &_end; 882 883 if (MACHINE_HAS_MVCOS) 884 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 885 else 886 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 887 888 parse_early_param(); 889 890 setup_ipl_info(); 891 setup_memory_end(); 892 setup_addressing_mode(); 893 setup_memory(); 894 setup_resources(); 895 setup_lowcore(); 896 897 cpu_init(); 898 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 899 smp_setup_cpu_possible_map(); 900 901 /* 902 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 903 */ 904 setup_hwcaps(); 905 906 /* 907 * Create kernel page tables and switch to virtual addressing. 908 */ 909 paging_init(); 910 911 /* Setup default console */ 912 conmode_default(); 913 914 /* Setup zfcpdump support */ 915 setup_zfcpdump(console_devno); 916 } 917 918 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo) 919 { 920 printk("cpu %d " 921 #ifdef CONFIG_SMP 922 "phys_idx=%d " 923 #endif 924 "vers=%02X ident=%06X machine=%04X unused=%04X\n", 925 cpuinfo->cpu_nr, 926 #ifdef CONFIG_SMP 927 cpuinfo->cpu_addr, 928 #endif 929 cpuinfo->cpu_id.version, 930 cpuinfo->cpu_id.ident, 931 cpuinfo->cpu_id.machine, 932 cpuinfo->cpu_id.unused); 933 } 934 935 /* 936 * show_cpuinfo - Get information on one CPU for use by procfs. 937 */ 938 939 static int show_cpuinfo(struct seq_file *m, void *v) 940 { 941 static const char *hwcap_str[7] = { 942 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp" 943 }; 944 struct cpuinfo_S390 *cpuinfo; 945 unsigned long n = (unsigned long) v - 1; 946 int i; 947 948 s390_adjust_jiffies(); 949 preempt_disable(); 950 if (!n) { 951 seq_printf(m, "vendor_id : IBM/S390\n" 952 "# processors : %i\n" 953 "bogomips per cpu: %lu.%02lu\n", 954 num_online_cpus(), loops_per_jiffy/(500000/HZ), 955 (loops_per_jiffy/(5000/HZ))%100); 956 seq_puts(m, "features\t: "); 957 for (i = 0; i < 7; i++) 958 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 959 seq_printf(m, "%s ", hwcap_str[i]); 960 seq_puts(m, "\n"); 961 } 962 963 if (cpu_online(n)) { 964 #ifdef CONFIG_SMP 965 if (smp_processor_id() == n) 966 cpuinfo = &S390_lowcore.cpu_data; 967 else 968 cpuinfo = &lowcore_ptr[n]->cpu_data; 969 #else 970 cpuinfo = &S390_lowcore.cpu_data; 971 #endif 972 seq_printf(m, "processor %li: " 973 "version = %02X, " 974 "identification = %06X, " 975 "machine = %04X\n", 976 n, cpuinfo->cpu_id.version, 977 cpuinfo->cpu_id.ident, 978 cpuinfo->cpu_id.machine); 979 } 980 preempt_enable(); 981 return 0; 982 } 983 984 static void *c_start(struct seq_file *m, loff_t *pos) 985 { 986 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; 987 } 988 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 989 { 990 ++*pos; 991 return c_start(m, pos); 992 } 993 static void c_stop(struct seq_file *m, void *v) 994 { 995 } 996 struct seq_operations cpuinfo_op = { 997 .start = c_start, 998 .next = c_next, 999 .stop = c_stop, 1000 .show = show_cpuinfo, 1001 }; 1002 1003