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, " "); 304 strcat(COMMAND_LINE, str); 305 console_loglevel = 2; 306 } 307 #else 308 static inline void setup_zfcpdump(unsigned int console_devno) {} 309 #endif /* CONFIG_ZFCPDUMP */ 310 311 #ifdef CONFIG_SMP 312 void (*_machine_restart)(char *command) = machine_restart_smp; 313 void (*_machine_halt)(void) = machine_halt_smp; 314 void (*_machine_power_off)(void) = machine_power_off_smp; 315 #else 316 /* 317 * Reboot, halt and power_off routines for non SMP. 318 */ 319 static void do_machine_restart_nonsmp(char * __unused) 320 { 321 do_reipl(); 322 } 323 324 static void do_machine_halt_nonsmp(void) 325 { 326 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) 327 __cpcmd(vmhalt_cmd, NULL, 0, NULL); 328 signal_processor(smp_processor_id(), sigp_stop_and_store_status); 329 } 330 331 static void do_machine_power_off_nonsmp(void) 332 { 333 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) 334 __cpcmd(vmpoff_cmd, NULL, 0, NULL); 335 signal_processor(smp_processor_id(), sigp_stop_and_store_status); 336 } 337 338 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp; 339 void (*_machine_halt)(void) = do_machine_halt_nonsmp; 340 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp; 341 #endif 342 343 /* 344 * Reboot, halt and power_off stubs. They just call _machine_restart, 345 * _machine_halt or _machine_power_off. 346 */ 347 348 void machine_restart(char *command) 349 { 350 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 351 /* 352 * Only unblank the console if we are called in enabled 353 * context or a bust_spinlocks cleared the way for us. 354 */ 355 console_unblank(); 356 _machine_restart(command); 357 } 358 359 void machine_halt(void) 360 { 361 if (!in_interrupt() || oops_in_progress) 362 /* 363 * Only unblank the console if we are called in enabled 364 * context or a bust_spinlocks cleared the way for us. 365 */ 366 console_unblank(); 367 _machine_halt(); 368 } 369 370 void machine_power_off(void) 371 { 372 if (!in_interrupt() || oops_in_progress) 373 /* 374 * Only unblank the console if we are called in enabled 375 * context or a bust_spinlocks cleared the way for us. 376 */ 377 console_unblank(); 378 _machine_power_off(); 379 } 380 381 /* 382 * Dummy power off function. 383 */ 384 void (*pm_power_off)(void) = machine_power_off; 385 386 static int __init early_parse_mem(char *p) 387 { 388 memory_end = memparse(p, &p); 389 return 0; 390 } 391 early_param("mem", early_parse_mem); 392 393 /* 394 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes 395 */ 396 static int __init early_parse_ipldelay(char *p) 397 { 398 unsigned long delay = 0; 399 400 delay = simple_strtoul(p, &p, 0); 401 402 switch (*p) { 403 case 's': 404 case 'S': 405 delay *= 1000000; 406 break; 407 case 'm': 408 case 'M': 409 delay *= 60 * 1000000; 410 } 411 412 /* now wait for the requested amount of time */ 413 udelay(delay); 414 415 return 0; 416 } 417 early_param("ipldelay", early_parse_ipldelay); 418 419 #ifdef CONFIG_S390_SWITCH_AMODE 420 unsigned int switch_amode = 0; 421 EXPORT_SYMBOL_GPL(switch_amode); 422 423 static void set_amode_and_uaccess(unsigned long user_amode, 424 unsigned long user32_amode) 425 { 426 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 427 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 428 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 429 #ifdef CONFIG_COMPAT 430 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 431 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 432 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 433 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 434 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 435 PSW32_MASK_PSTATE; 436 #endif 437 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 438 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 439 440 if (MACHINE_HAS_MVCOS) { 441 printk("mvcos available.\n"); 442 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 443 } else { 444 printk("mvcos not available.\n"); 445 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 446 } 447 } 448 449 /* 450 * Switch kernel/user addressing modes? 451 */ 452 static int __init early_parse_switch_amode(char *p) 453 { 454 switch_amode = 1; 455 return 0; 456 } 457 early_param("switch_amode", early_parse_switch_amode); 458 459 #else /* CONFIG_S390_SWITCH_AMODE */ 460 static inline void set_amode_and_uaccess(unsigned long user_amode, 461 unsigned long user32_amode) 462 { 463 } 464 #endif /* CONFIG_S390_SWITCH_AMODE */ 465 466 #ifdef CONFIG_S390_EXEC_PROTECT 467 unsigned int s390_noexec = 0; 468 EXPORT_SYMBOL_GPL(s390_noexec); 469 470 /* 471 * Enable execute protection? 472 */ 473 static int __init early_parse_noexec(char *p) 474 { 475 if (!strncmp(p, "off", 3)) 476 return 0; 477 switch_amode = 1; 478 s390_noexec = 1; 479 return 0; 480 } 481 early_param("noexec", early_parse_noexec); 482 #endif /* CONFIG_S390_EXEC_PROTECT */ 483 484 static void setup_addressing_mode(void) 485 { 486 if (s390_noexec) { 487 printk("S390 execute protection active, "); 488 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY); 489 } else if (switch_amode) { 490 printk("S390 address spaces switched, "); 491 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY); 492 } 493 #ifdef CONFIG_TRACE_IRQFLAGS 494 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 495 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK; 496 #endif 497 } 498 499 static void __init 500 setup_lowcore(void) 501 { 502 struct _lowcore *lc; 503 int lc_pages; 504 505 /* 506 * Setup lowcore for boot cpu 507 */ 508 lc_pages = sizeof(void *) == 8 ? 2 : 1; 509 lc = (struct _lowcore *) 510 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 511 memset(lc, 0, lc_pages * PAGE_SIZE); 512 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 513 lc->restart_psw.addr = 514 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 515 if (switch_amode) 516 lc->restart_psw.mask |= PSW_ASC_HOME; 517 lc->external_new_psw.mask = psw_kernel_bits; 518 lc->external_new_psw.addr = 519 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 520 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 521 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 522 lc->program_new_psw.mask = psw_kernel_bits; 523 lc->program_new_psw.addr = 524 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 525 lc->mcck_new_psw.mask = 526 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 527 lc->mcck_new_psw.addr = 528 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 529 lc->io_new_psw.mask = psw_kernel_bits; 530 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 531 lc->ipl_device = S390_lowcore.ipl_device; 532 lc->jiffy_timer = -1LL; 533 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 534 lc->async_stack = (unsigned long) 535 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 536 lc->panic_stack = (unsigned long) 537 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 538 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 539 lc->thread_info = (unsigned long) &init_thread_union; 540 #ifndef CONFIG_64BIT 541 if (MACHINE_HAS_IEEE) { 542 lc->extended_save_area_addr = (__u32) 543 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 544 /* enable extended save area */ 545 __ctl_set_bit(14, 29); 546 } 547 #endif 548 set_prefix((u32)(unsigned long) lc); 549 } 550 551 static void __init 552 setup_resources(void) 553 { 554 struct resource *res, *sub_res; 555 int i; 556 557 code_resource.start = (unsigned long) &_text; 558 code_resource.end = (unsigned long) &_etext - 1; 559 data_resource.start = (unsigned long) &_etext; 560 data_resource.end = (unsigned long) &_edata - 1; 561 562 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 563 res = alloc_bootmem_low(sizeof(struct resource)); 564 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 565 switch (memory_chunk[i].type) { 566 case CHUNK_READ_WRITE: 567 res->name = "System RAM"; 568 break; 569 case CHUNK_READ_ONLY: 570 res->name = "System ROM"; 571 res->flags |= IORESOURCE_READONLY; 572 break; 573 default: 574 res->name = "reserved"; 575 } 576 res->start = memory_chunk[i].addr; 577 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 578 request_resource(&iomem_resource, res); 579 580 if (code_resource.start >= res->start && 581 code_resource.start <= res->end && 582 code_resource.end > res->end) { 583 sub_res = alloc_bootmem_low(sizeof(struct resource)); 584 memcpy(sub_res, &code_resource, 585 sizeof(struct resource)); 586 sub_res->end = res->end; 587 code_resource.start = res->end + 1; 588 request_resource(res, sub_res); 589 } 590 591 if (code_resource.start >= res->start && 592 code_resource.start <= res->end && 593 code_resource.end <= res->end) 594 request_resource(res, &code_resource); 595 596 if (data_resource.start >= res->start && 597 data_resource.start <= res->end && 598 data_resource.end > res->end) { 599 sub_res = alloc_bootmem_low(sizeof(struct resource)); 600 memcpy(sub_res, &data_resource, 601 sizeof(struct resource)); 602 sub_res->end = res->end; 603 data_resource.start = res->end + 1; 604 request_resource(res, sub_res); 605 } 606 607 if (data_resource.start >= res->start && 608 data_resource.start <= res->end && 609 data_resource.end <= res->end) 610 request_resource(res, &data_resource); 611 } 612 } 613 614 unsigned long real_memory_size; 615 EXPORT_SYMBOL_GPL(real_memory_size); 616 617 static void __init setup_memory_end(void) 618 { 619 unsigned long memory_size; 620 unsigned long max_mem, max_phys; 621 int i; 622 623 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 624 if (ipl_info.type == IPL_TYPE_FCP_DUMP) 625 memory_end = ZFCPDUMP_HSA_SIZE; 626 #endif 627 memory_size = 0; 628 max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE; 629 memory_end &= PAGE_MASK; 630 631 max_mem = memory_end ? min(max_phys, memory_end) : max_phys; 632 633 for (i = 0; i < MEMORY_CHUNKS; i++) { 634 struct mem_chunk *chunk = &memory_chunk[i]; 635 636 real_memory_size = max(real_memory_size, 637 chunk->addr + chunk->size); 638 if (chunk->addr >= max_mem) { 639 memset(chunk, 0, sizeof(*chunk)); 640 continue; 641 } 642 if (chunk->addr + chunk->size > max_mem) 643 chunk->size = max_mem - chunk->addr; 644 memory_size = max(memory_size, chunk->addr + chunk->size); 645 } 646 if (!memory_end) 647 memory_end = memory_size; 648 } 649 650 static void __init 651 setup_memory(void) 652 { 653 unsigned long bootmap_size; 654 unsigned long start_pfn, end_pfn; 655 int i; 656 657 /* 658 * partially used pages are not usable - thus 659 * we are rounding upwards: 660 */ 661 start_pfn = PFN_UP(__pa(&_end)); 662 end_pfn = max_pfn = PFN_DOWN(memory_end); 663 664 #ifdef CONFIG_BLK_DEV_INITRD 665 /* 666 * Move the initrd in case the bitmap of the bootmem allocater 667 * would overwrite it. 668 */ 669 670 if (INITRD_START && INITRD_SIZE) { 671 unsigned long bmap_size; 672 unsigned long start; 673 674 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 675 bmap_size = PFN_PHYS(bmap_size); 676 677 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 678 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 679 680 if (start + INITRD_SIZE > memory_end) { 681 printk("initrd extends beyond end of memory " 682 "(0x%08lx > 0x%08lx)\n" 683 "disabling initrd\n", 684 start + INITRD_SIZE, memory_end); 685 INITRD_START = INITRD_SIZE = 0; 686 } else { 687 printk("Moving initrd (0x%08lx -> 0x%08lx, " 688 "size: %ld)\n", 689 INITRD_START, start, INITRD_SIZE); 690 memmove((void *) start, (void *) INITRD_START, 691 INITRD_SIZE); 692 INITRD_START = start; 693 } 694 } 695 } 696 #endif 697 698 /* 699 * Initialize the boot-time allocator 700 */ 701 bootmap_size = init_bootmem(start_pfn, end_pfn); 702 703 /* 704 * Register RAM areas with the bootmem allocator. 705 */ 706 707 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 708 unsigned long start_chunk, end_chunk, pfn; 709 710 if (memory_chunk[i].type != CHUNK_READ_WRITE) 711 continue; 712 start_chunk = PFN_DOWN(memory_chunk[i].addr); 713 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1; 714 end_chunk = min(end_chunk, end_pfn); 715 if (start_chunk >= end_chunk) 716 continue; 717 add_active_range(0, start_chunk, end_chunk); 718 pfn = max(start_chunk, start_pfn); 719 for (; pfn <= end_chunk; pfn++) 720 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 721 } 722 723 psw_set_key(PAGE_DEFAULT_KEY); 724 725 free_bootmem_with_active_regions(0, max_pfn); 726 727 /* 728 * Reserve memory used for lowcore/command line/kernel image. 729 */ 730 reserve_bootmem(0, (unsigned long)_ehead); 731 reserve_bootmem((unsigned long)_stext, 732 PFN_PHYS(start_pfn) - (unsigned long)_stext); 733 /* 734 * Reserve the bootmem bitmap itself as well. We do this in two 735 * steps (first step was init_bootmem()) because this catches 736 * the (very unlikely) case of us accidentally initializing the 737 * bootmem allocator with an invalid RAM area. 738 */ 739 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size); 740 741 #ifdef CONFIG_BLK_DEV_INITRD 742 if (INITRD_START && INITRD_SIZE) { 743 if (INITRD_START + INITRD_SIZE <= memory_end) { 744 reserve_bootmem(INITRD_START, INITRD_SIZE); 745 initrd_start = INITRD_START; 746 initrd_end = initrd_start + INITRD_SIZE; 747 } else { 748 printk("initrd extends beyond end of memory " 749 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 750 initrd_start + INITRD_SIZE, memory_end); 751 initrd_start = initrd_end = 0; 752 } 753 } 754 #endif 755 } 756 757 static __init unsigned int stfl(void) 758 { 759 asm volatile( 760 " .insn s,0xb2b10000,0(0)\n" /* stfl */ 761 "0:\n" 762 EX_TABLE(0b,0b)); 763 return S390_lowcore.stfl_fac_list; 764 } 765 766 static __init int stfle(unsigned long long *list, int doublewords) 767 { 768 typedef struct { unsigned long long _[doublewords]; } addrtype; 769 register unsigned long __nr asm("0") = doublewords - 1; 770 771 asm volatile(".insn s,0xb2b00000,%0" /* stfle */ 772 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc"); 773 return __nr + 1; 774 } 775 776 /* 777 * Setup hardware capabilities. 778 */ 779 static void __init setup_hwcaps(void) 780 { 781 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 782 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; 783 unsigned long long facility_list_extended; 784 unsigned int facility_list; 785 int i; 786 787 facility_list = stfl(); 788 /* 789 * The store facility list bits numbers as found in the principles 790 * of operation are numbered with bit 1UL<<31 as number 0 to 791 * bit 1UL<<0 as number 31. 792 * Bit 0: instructions named N3, "backported" to esa-mode 793 * Bit 2: z/Architecture mode is active 794 * Bit 7: the store-facility-list-extended facility is installed 795 * Bit 17: the message-security assist is installed 796 * Bit 19: the long-displacement facility is installed 797 * Bit 21: the extended-immediate facility is installed 798 * These get translated to: 799 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 800 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 801 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5. 802 */ 803 for (i = 0; i < 6; i++) 804 if (facility_list & (1UL << (31 - stfl_bits[i]))) 805 elf_hwcap |= 1UL << i; 806 807 /* 808 * Check for additional facilities with store-facility-list-extended. 809 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 810 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 811 * as stored by stfl, bits 32-xxx contain additional facilities. 812 * How many facility words are stored depends on the number of 813 * doublewords passed to the instruction. The additional facilites 814 * are: 815 * Bit 43: decimal floating point facility is installed 816 * translated to: 817 * HWCAP_S390_DFP bit 6. 818 */ 819 if ((elf_hwcap & (1UL << 2)) && 820 stfle(&facility_list_extended, 1) > 0) { 821 if (facility_list_extended & (1ULL << (64 - 43))) 822 elf_hwcap |= 1UL << 6; 823 } 824 825 switch (cpuinfo->cpu_id.machine) { 826 case 0x9672: 827 #if !defined(CONFIG_64BIT) 828 default: /* Use "g5" as default for 31 bit kernels. */ 829 #endif 830 strcpy(elf_platform, "g5"); 831 break; 832 case 0x2064: 833 case 0x2066: 834 #if defined(CONFIG_64BIT) 835 default: /* Use "z900" as default for 64 bit kernels. */ 836 #endif 837 strcpy(elf_platform, "z900"); 838 break; 839 case 0x2084: 840 case 0x2086: 841 strcpy(elf_platform, "z990"); 842 break; 843 case 0x2094: 844 strcpy(elf_platform, "z9-109"); 845 break; 846 } 847 } 848 849 /* 850 * Setup function called from init/main.c just after the banner 851 * was printed. 852 */ 853 854 void __init 855 setup_arch(char **cmdline_p) 856 { 857 /* 858 * print what head.S has found out about the machine 859 */ 860 #ifndef CONFIG_64BIT 861 printk((MACHINE_IS_VM) ? 862 "We are running under VM (31 bit mode)\n" : 863 "We are running native (31 bit mode)\n"); 864 printk((MACHINE_HAS_IEEE) ? 865 "This machine has an IEEE fpu\n" : 866 "This machine has no IEEE fpu\n"); 867 #else /* CONFIG_64BIT */ 868 printk((MACHINE_IS_VM) ? 869 "We are running under VM (64 bit mode)\n" : 870 "We are running native (64 bit mode)\n"); 871 #endif /* CONFIG_64BIT */ 872 873 /* Save unparsed command line copy for /proc/cmdline */ 874 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 875 876 *cmdline_p = COMMAND_LINE; 877 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0'; 878 879 ROOT_DEV = Root_RAM0; 880 881 init_mm.start_code = PAGE_OFFSET; 882 init_mm.end_code = (unsigned long) &_etext; 883 init_mm.end_data = (unsigned long) &_edata; 884 init_mm.brk = (unsigned long) &_end; 885 886 if (MACHINE_HAS_MVCOS) 887 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 888 else 889 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 890 891 parse_early_param(); 892 893 setup_ipl_info(); 894 setup_memory_end(); 895 setup_addressing_mode(); 896 setup_memory(); 897 setup_resources(); 898 setup_lowcore(); 899 900 cpu_init(); 901 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 902 smp_setup_cpu_possible_map(); 903 904 /* 905 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 906 */ 907 setup_hwcaps(); 908 909 /* 910 * Create kernel page tables and switch to virtual addressing. 911 */ 912 paging_init(); 913 914 /* Setup default console */ 915 conmode_default(); 916 917 /* Setup zfcpdump support */ 918 setup_zfcpdump(console_devno); 919 } 920 921 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo) 922 { 923 printk("cpu %d " 924 #ifdef CONFIG_SMP 925 "phys_idx=%d " 926 #endif 927 "vers=%02X ident=%06X machine=%04X unused=%04X\n", 928 cpuinfo->cpu_nr, 929 #ifdef CONFIG_SMP 930 cpuinfo->cpu_addr, 931 #endif 932 cpuinfo->cpu_id.version, 933 cpuinfo->cpu_id.ident, 934 cpuinfo->cpu_id.machine, 935 cpuinfo->cpu_id.unused); 936 } 937 938 /* 939 * show_cpuinfo - Get information on one CPU for use by procfs. 940 */ 941 942 static int show_cpuinfo(struct seq_file *m, void *v) 943 { 944 static const char *hwcap_str[7] = { 945 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp" 946 }; 947 struct cpuinfo_S390 *cpuinfo; 948 unsigned long n = (unsigned long) v - 1; 949 int i; 950 951 s390_adjust_jiffies(); 952 preempt_disable(); 953 if (!n) { 954 seq_printf(m, "vendor_id : IBM/S390\n" 955 "# processors : %i\n" 956 "bogomips per cpu: %lu.%02lu\n", 957 num_online_cpus(), loops_per_jiffy/(500000/HZ), 958 (loops_per_jiffy/(5000/HZ))%100); 959 seq_puts(m, "features\t: "); 960 for (i = 0; i < 7; i++) 961 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 962 seq_printf(m, "%s ", hwcap_str[i]); 963 seq_puts(m, "\n"); 964 } 965 966 if (cpu_online(n)) { 967 #ifdef CONFIG_SMP 968 if (smp_processor_id() == n) 969 cpuinfo = &S390_lowcore.cpu_data; 970 else 971 cpuinfo = &lowcore_ptr[n]->cpu_data; 972 #else 973 cpuinfo = &S390_lowcore.cpu_data; 974 #endif 975 seq_printf(m, "processor %li: " 976 "version = %02X, " 977 "identification = %06X, " 978 "machine = %04X\n", 979 n, cpuinfo->cpu_id.version, 980 cpuinfo->cpu_id.ident, 981 cpuinfo->cpu_id.machine); 982 } 983 preempt_enable(); 984 return 0; 985 } 986 987 static void *c_start(struct seq_file *m, loff_t *pos) 988 { 989 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; 990 } 991 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 992 { 993 ++*pos; 994 return c_start(m, pos); 995 } 996 static void c_stop(struct seq_file *m, void *v) 997 { 998 } 999 struct seq_operations cpuinfo_op = { 1000 .start = c_start, 1001 .next = c_next, 1002 .stop = c_stop, 1003 .show = show_cpuinfo, 1004 }; 1005 1006