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() || 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 return; 490 } 491 if (switch_amode) { 492 printk("S390 address spaces switched, "); 493 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY); 494 } 495 } 496 497 static void __init 498 setup_lowcore(void) 499 { 500 struct _lowcore *lc; 501 int lc_pages; 502 503 /* 504 * Setup lowcore for boot cpu 505 */ 506 lc_pages = sizeof(void *) == 8 ? 2 : 1; 507 lc = (struct _lowcore *) 508 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0); 509 memset(lc, 0, lc_pages * PAGE_SIZE); 510 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 511 lc->restart_psw.addr = 512 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 513 if (switch_amode) 514 lc->restart_psw.mask |= PSW_ASC_HOME; 515 lc->external_new_psw.mask = psw_kernel_bits; 516 lc->external_new_psw.addr = 517 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 518 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 519 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 520 lc->program_new_psw.mask = psw_kernel_bits; 521 lc->program_new_psw.addr = 522 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 523 lc->mcck_new_psw.mask = 524 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 525 lc->mcck_new_psw.addr = 526 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 527 lc->io_new_psw.mask = psw_kernel_bits; 528 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 529 lc->ipl_device = S390_lowcore.ipl_device; 530 lc->jiffy_timer = -1LL; 531 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 532 lc->async_stack = (unsigned long) 533 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 534 lc->panic_stack = (unsigned long) 535 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 536 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 537 lc->thread_info = (unsigned long) &init_thread_union; 538 #ifndef CONFIG_64BIT 539 if (MACHINE_HAS_IEEE) { 540 lc->extended_save_area_addr = (__u32) 541 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 542 /* enable extended save area */ 543 __ctl_set_bit(14, 29); 544 } 545 #endif 546 set_prefix((u32)(unsigned long) lc); 547 } 548 549 static void __init 550 setup_resources(void) 551 { 552 struct resource *res, *sub_res; 553 int i; 554 555 code_resource.start = (unsigned long) &_text; 556 code_resource.end = (unsigned long) &_etext - 1; 557 data_resource.start = (unsigned long) &_etext; 558 data_resource.end = (unsigned long) &_edata - 1; 559 560 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 561 res = alloc_bootmem_low(sizeof(struct resource)); 562 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 563 switch (memory_chunk[i].type) { 564 case CHUNK_READ_WRITE: 565 res->name = "System RAM"; 566 break; 567 case CHUNK_READ_ONLY: 568 res->name = "System ROM"; 569 res->flags |= IORESOURCE_READONLY; 570 break; 571 default: 572 res->name = "reserved"; 573 } 574 res->start = memory_chunk[i].addr; 575 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 576 request_resource(&iomem_resource, res); 577 578 if (code_resource.start >= res->start && 579 code_resource.start <= res->end && 580 code_resource.end > res->end) { 581 sub_res = alloc_bootmem_low(sizeof(struct resource)); 582 memcpy(sub_res, &code_resource, 583 sizeof(struct resource)); 584 sub_res->end = res->end; 585 code_resource.start = res->end + 1; 586 request_resource(res, sub_res); 587 } 588 589 if (code_resource.start >= res->start && 590 code_resource.start <= res->end && 591 code_resource.end <= res->end) 592 request_resource(res, &code_resource); 593 594 if (data_resource.start >= res->start && 595 data_resource.start <= res->end && 596 data_resource.end > res->end) { 597 sub_res = alloc_bootmem_low(sizeof(struct resource)); 598 memcpy(sub_res, &data_resource, 599 sizeof(struct resource)); 600 sub_res->end = res->end; 601 data_resource.start = res->end + 1; 602 request_resource(res, sub_res); 603 } 604 605 if (data_resource.start >= res->start && 606 data_resource.start <= res->end && 607 data_resource.end <= res->end) 608 request_resource(res, &data_resource); 609 } 610 } 611 612 unsigned long real_memory_size; 613 EXPORT_SYMBOL_GPL(real_memory_size); 614 615 static void __init setup_memory_end(void) 616 { 617 unsigned long memory_size; 618 unsigned long max_mem, max_phys; 619 int i; 620 621 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE) 622 if (ipl_info.type == IPL_TYPE_FCP_DUMP) 623 memory_end = ZFCPDUMP_HSA_SIZE; 624 #endif 625 memory_size = 0; 626 max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE; 627 memory_end &= PAGE_MASK; 628 629 max_mem = memory_end ? min(max_phys, memory_end) : max_phys; 630 631 for (i = 0; i < MEMORY_CHUNKS; i++) { 632 struct mem_chunk *chunk = &memory_chunk[i]; 633 634 real_memory_size = max(real_memory_size, 635 chunk->addr + chunk->size); 636 if (chunk->addr >= max_mem) { 637 memset(chunk, 0, sizeof(*chunk)); 638 continue; 639 } 640 if (chunk->addr + chunk->size > max_mem) 641 chunk->size = max_mem - chunk->addr; 642 memory_size = max(memory_size, chunk->addr + chunk->size); 643 } 644 if (!memory_end) 645 memory_end = memory_size; 646 } 647 648 static void __init 649 setup_memory(void) 650 { 651 unsigned long bootmap_size; 652 unsigned long start_pfn, end_pfn; 653 int i; 654 655 /* 656 * partially used pages are not usable - thus 657 * we are rounding upwards: 658 */ 659 start_pfn = PFN_UP(__pa(&_end)); 660 end_pfn = max_pfn = PFN_DOWN(memory_end); 661 662 #ifdef CONFIG_BLK_DEV_INITRD 663 /* 664 * Move the initrd in case the bitmap of the bootmem allocater 665 * would overwrite it. 666 */ 667 668 if (INITRD_START && INITRD_SIZE) { 669 unsigned long bmap_size; 670 unsigned long start; 671 672 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 673 bmap_size = PFN_PHYS(bmap_size); 674 675 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 676 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 677 678 if (start + INITRD_SIZE > memory_end) { 679 printk("initrd extends beyond end of memory " 680 "(0x%08lx > 0x%08lx)\n" 681 "disabling initrd\n", 682 start + INITRD_SIZE, memory_end); 683 INITRD_START = INITRD_SIZE = 0; 684 } else { 685 printk("Moving initrd (0x%08lx -> 0x%08lx, " 686 "size: %ld)\n", 687 INITRD_START, start, INITRD_SIZE); 688 memmove((void *) start, (void *) INITRD_START, 689 INITRD_SIZE); 690 INITRD_START = start; 691 } 692 } 693 } 694 #endif 695 696 /* 697 * Initialize the boot-time allocator 698 */ 699 bootmap_size = init_bootmem(start_pfn, end_pfn); 700 701 /* 702 * Register RAM areas with the bootmem allocator. 703 */ 704 705 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 706 unsigned long start_chunk, end_chunk, pfn; 707 708 if (memory_chunk[i].type != CHUNK_READ_WRITE) 709 continue; 710 start_chunk = PFN_DOWN(memory_chunk[i].addr); 711 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1; 712 end_chunk = min(end_chunk, end_pfn); 713 if (start_chunk >= end_chunk) 714 continue; 715 add_active_range(0, start_chunk, end_chunk); 716 pfn = max(start_chunk, start_pfn); 717 for (; pfn <= end_chunk; pfn++) 718 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY); 719 } 720 721 psw_set_key(PAGE_DEFAULT_KEY); 722 723 free_bootmem_with_active_regions(0, max_pfn); 724 725 /* 726 * Reserve memory used for lowcore/command line/kernel image. 727 */ 728 reserve_bootmem(0, (unsigned long)_ehead); 729 reserve_bootmem((unsigned long)_stext, 730 PFN_PHYS(start_pfn) - (unsigned long)_stext); 731 /* 732 * Reserve the bootmem bitmap itself as well. We do this in two 733 * steps (first step was init_bootmem()) because this catches 734 * the (very unlikely) case of us accidentally initializing the 735 * bootmem allocator with an invalid RAM area. 736 */ 737 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size); 738 739 #ifdef CONFIG_BLK_DEV_INITRD 740 if (INITRD_START && INITRD_SIZE) { 741 if (INITRD_START + INITRD_SIZE <= memory_end) { 742 reserve_bootmem(INITRD_START, INITRD_SIZE); 743 initrd_start = INITRD_START; 744 initrd_end = initrd_start + INITRD_SIZE; 745 } else { 746 printk("initrd extends beyond end of memory " 747 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 748 initrd_start + INITRD_SIZE, memory_end); 749 initrd_start = initrd_end = 0; 750 } 751 } 752 #endif 753 } 754 755 static __init unsigned int stfl(void) 756 { 757 asm volatile( 758 " .insn s,0xb2b10000,0(0)\n" /* stfl */ 759 "0:\n" 760 EX_TABLE(0b,0b)); 761 return S390_lowcore.stfl_fac_list; 762 } 763 764 static __init int stfle(unsigned long long *list, int doublewords) 765 { 766 typedef struct { unsigned long long _[doublewords]; } addrtype; 767 register unsigned long __nr asm("0") = doublewords - 1; 768 769 asm volatile(".insn s,0xb2b00000,%0" /* stfle */ 770 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc"); 771 return __nr + 1; 772 } 773 774 /* 775 * Setup hardware capabilities. 776 */ 777 static void __init setup_hwcaps(void) 778 { 779 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 780 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; 781 unsigned long long facility_list_extended; 782 unsigned int facility_list; 783 int i; 784 785 facility_list = stfl(); 786 /* 787 * The store facility list bits numbers as found in the principles 788 * of operation are numbered with bit 1UL<<31 as number 0 to 789 * bit 1UL<<0 as number 31. 790 * Bit 0: instructions named N3, "backported" to esa-mode 791 * Bit 2: z/Architecture mode is active 792 * Bit 7: the store-facility-list-extended facility is installed 793 * Bit 17: the message-security assist is installed 794 * Bit 19: the long-displacement facility is installed 795 * Bit 21: the extended-immediate facility is installed 796 * These get translated to: 797 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 798 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 799 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5. 800 */ 801 for (i = 0; i < 6; i++) 802 if (facility_list & (1UL << (31 - stfl_bits[i]))) 803 elf_hwcap |= 1UL << i; 804 805 /* 806 * Check for additional facilities with store-facility-list-extended. 807 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 808 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 809 * as stored by stfl, bits 32-xxx contain additional facilities. 810 * How many facility words are stored depends on the number of 811 * doublewords passed to the instruction. The additional facilites 812 * are: 813 * Bit 43: decimal floating point facility is installed 814 * translated to: 815 * HWCAP_S390_DFP bit 6. 816 */ 817 if ((elf_hwcap & (1UL << 2)) && 818 stfle(&facility_list_extended, 1) > 0) { 819 if (facility_list_extended & (1ULL << (64 - 43))) 820 elf_hwcap |= 1UL << 6; 821 } 822 823 switch (cpuinfo->cpu_id.machine) { 824 case 0x9672: 825 #if !defined(CONFIG_64BIT) 826 default: /* Use "g5" as default for 31 bit kernels. */ 827 #endif 828 strcpy(elf_platform, "g5"); 829 break; 830 case 0x2064: 831 case 0x2066: 832 #if defined(CONFIG_64BIT) 833 default: /* Use "z900" as default for 64 bit kernels. */ 834 #endif 835 strcpy(elf_platform, "z900"); 836 break; 837 case 0x2084: 838 case 0x2086: 839 strcpy(elf_platform, "z990"); 840 break; 841 case 0x2094: 842 strcpy(elf_platform, "z9-109"); 843 break; 844 } 845 } 846 847 /* 848 * Setup function called from init/main.c just after the banner 849 * was printed. 850 */ 851 852 void __init 853 setup_arch(char **cmdline_p) 854 { 855 /* 856 * print what head.S has found out about the machine 857 */ 858 #ifndef CONFIG_64BIT 859 printk((MACHINE_IS_VM) ? 860 "We are running under VM (31 bit mode)\n" : 861 "We are running native (31 bit mode)\n"); 862 printk((MACHINE_HAS_IEEE) ? 863 "This machine has an IEEE fpu\n" : 864 "This machine has no IEEE fpu\n"); 865 #else /* CONFIG_64BIT */ 866 printk((MACHINE_IS_VM) ? 867 "We are running under VM (64 bit mode)\n" : 868 "We are running native (64 bit mode)\n"); 869 #endif /* CONFIG_64BIT */ 870 871 /* Save unparsed command line copy for /proc/cmdline */ 872 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 873 874 *cmdline_p = COMMAND_LINE; 875 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0'; 876 877 ROOT_DEV = Root_RAM0; 878 879 init_mm.start_code = PAGE_OFFSET; 880 init_mm.end_code = (unsigned long) &_etext; 881 init_mm.end_data = (unsigned long) &_edata; 882 init_mm.brk = (unsigned long) &_end; 883 884 if (MACHINE_HAS_MVCOS) 885 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 886 else 887 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 888 889 parse_early_param(); 890 891 setup_ipl_info(); 892 setup_memory_end(); 893 setup_addressing_mode(); 894 setup_memory(); 895 setup_resources(); 896 setup_lowcore(); 897 898 cpu_init(); 899 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 900 smp_setup_cpu_possible_map(); 901 902 /* 903 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 904 */ 905 setup_hwcaps(); 906 907 /* 908 * Create kernel page tables and switch to virtual addressing. 909 */ 910 paging_init(); 911 912 /* Setup default console */ 913 conmode_default(); 914 915 /* Setup zfcpdump support */ 916 setup_zfcpdump(console_devno); 917 } 918 919 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo) 920 { 921 printk("cpu %d " 922 #ifdef CONFIG_SMP 923 "phys_idx=%d " 924 #endif 925 "vers=%02X ident=%06X machine=%04X unused=%04X\n", 926 cpuinfo->cpu_nr, 927 #ifdef CONFIG_SMP 928 cpuinfo->cpu_addr, 929 #endif 930 cpuinfo->cpu_id.version, 931 cpuinfo->cpu_id.ident, 932 cpuinfo->cpu_id.machine, 933 cpuinfo->cpu_id.unused); 934 } 935 936 /* 937 * show_cpuinfo - Get information on one CPU for use by procfs. 938 */ 939 940 static int show_cpuinfo(struct seq_file *m, void *v) 941 { 942 static const char *hwcap_str[7] = { 943 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp" 944 }; 945 struct cpuinfo_S390 *cpuinfo; 946 unsigned long n = (unsigned long) v - 1; 947 int i; 948 949 s390_adjust_jiffies(); 950 preempt_disable(); 951 if (!n) { 952 seq_printf(m, "vendor_id : IBM/S390\n" 953 "# processors : %i\n" 954 "bogomips per cpu: %lu.%02lu\n", 955 num_online_cpus(), loops_per_jiffy/(500000/HZ), 956 (loops_per_jiffy/(5000/HZ))%100); 957 seq_puts(m, "features\t: "); 958 for (i = 0; i < 7; i++) 959 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 960 seq_printf(m, "%s ", hwcap_str[i]); 961 seq_puts(m, "\n"); 962 } 963 964 if (cpu_online(n)) { 965 #ifdef CONFIG_SMP 966 if (smp_processor_id() == n) 967 cpuinfo = &S390_lowcore.cpu_data; 968 else 969 cpuinfo = &lowcore_ptr[n]->cpu_data; 970 #else 971 cpuinfo = &S390_lowcore.cpu_data; 972 #endif 973 seq_printf(m, "processor %li: " 974 "version = %02X, " 975 "identification = %06X, " 976 "machine = %04X\n", 977 n, cpuinfo->cpu_id.version, 978 cpuinfo->cpu_id.ident, 979 cpuinfo->cpu_id.machine); 980 } 981 preempt_enable(); 982 return 0; 983 } 984 985 static void *c_start(struct seq_file *m, loff_t *pos) 986 { 987 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; 988 } 989 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 990 { 991 ++*pos; 992 return c_start(m, pos); 993 } 994 static void c_stop(struct seq_file *m, void *v) 995 { 996 } 997 struct seq_operations cpuinfo_op = { 998 .start = c_start, 999 .next = c_next, 1000 .stop = c_stop, 1001 .show = show_cpuinfo, 1002 }; 1003 1004