1 /* 2 * arch/s390/kernel/setup.c 3 * 4 * S390 version 5 * Copyright (C) IBM Corp. 1999,2010 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 #define KMSG_COMPONENT "setup" 18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 19 20 #include <linux/errno.h> 21 #include <linux/module.h> 22 #include <linux/sched.h> 23 #include <linux/kernel.h> 24 #include <linux/mm.h> 25 #include <linux/stddef.h> 26 #include <linux/unistd.h> 27 #include <linux/ptrace.h> 28 #include <linux/user.h> 29 #include <linux/tty.h> 30 #include <linux/ioport.h> 31 #include <linux/delay.h> 32 #include <linux/init.h> 33 #include <linux/initrd.h> 34 #include <linux/bootmem.h> 35 #include <linux/root_dev.h> 36 #include <linux/console.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 #include <linux/topology.h> 44 #include <linux/ftrace.h> 45 #include <linux/kexec.h> 46 #include <linux/crash_dump.h> 47 #include <linux/memory.h> 48 49 #include <asm/ipl.h> 50 #include <asm/uaccess.h> 51 #include <asm/system.h> 52 #include <asm/smp.h> 53 #include <asm/mmu_context.h> 54 #include <asm/cpcmd.h> 55 #include <asm/lowcore.h> 56 #include <asm/irq.h> 57 #include <asm/page.h> 58 #include <asm/ptrace.h> 59 #include <asm/sections.h> 60 #include <asm/ebcdic.h> 61 #include <asm/compat.h> 62 #include <asm/kvm_virtio.h> 63 #include <asm/diag.h> 64 65 long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY | 66 PSW_MASK_EA | PSW_MASK_BA; 67 long psw_user_bits = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | 68 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK | 69 PSW_MASK_PSTATE | PSW_ASC_HOME; 70 71 /* 72 * User copy operations. 73 */ 74 struct uaccess_ops uaccess; 75 EXPORT_SYMBOL(uaccess); 76 77 /* 78 * Machine setup.. 79 */ 80 unsigned int console_mode = 0; 81 EXPORT_SYMBOL(console_mode); 82 83 unsigned int console_devno = -1; 84 EXPORT_SYMBOL(console_devno); 85 86 unsigned int console_irq = -1; 87 EXPORT_SYMBOL(console_irq); 88 89 unsigned long elf_hwcap = 0; 90 char elf_platform[ELF_PLATFORM_SIZE]; 91 92 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS]; 93 94 int __initdata memory_end_set; 95 unsigned long __initdata memory_end; 96 97 /* An array with a pointer to the lowcore of every CPU. */ 98 struct _lowcore *lowcore_ptr[NR_CPUS]; 99 EXPORT_SYMBOL(lowcore_ptr); 100 101 /* 102 * This is set up by the setup-routine at boot-time 103 * for S390 need to find out, what we have to setup 104 * using address 0x10400 ... 105 */ 106 107 #include <asm/setup.h> 108 109 /* 110 * condev= and conmode= setup parameter. 111 */ 112 113 static int __init condev_setup(char *str) 114 { 115 int vdev; 116 117 vdev = simple_strtoul(str, &str, 0); 118 if (vdev >= 0 && vdev < 65536) { 119 console_devno = vdev; 120 console_irq = -1; 121 } 122 return 1; 123 } 124 125 __setup("condev=", condev_setup); 126 127 static void __init set_preferred_console(void) 128 { 129 if (MACHINE_IS_KVM) 130 add_preferred_console("hvc", 0, NULL); 131 else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 132 add_preferred_console("ttyS", 0, NULL); 133 else if (CONSOLE_IS_3270) 134 add_preferred_console("tty3270", 0, NULL); 135 } 136 137 static int __init conmode_setup(char *str) 138 { 139 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 140 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 141 SET_CONSOLE_SCLP; 142 #endif 143 #if defined(CONFIG_TN3215_CONSOLE) 144 if (strncmp(str, "3215", 5) == 0) 145 SET_CONSOLE_3215; 146 #endif 147 #if defined(CONFIG_TN3270_CONSOLE) 148 if (strncmp(str, "3270", 5) == 0) 149 SET_CONSOLE_3270; 150 #endif 151 set_preferred_console(); 152 return 1; 153 } 154 155 __setup("conmode=", conmode_setup); 156 157 static void __init conmode_default(void) 158 { 159 char query_buffer[1024]; 160 char *ptr; 161 162 if (MACHINE_IS_VM) { 163 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 164 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 165 ptr = strstr(query_buffer, "SUBCHANNEL ="); 166 console_irq = simple_strtoul(ptr + 13, NULL, 16); 167 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 168 ptr = strstr(query_buffer, "CONMODE"); 169 /* 170 * Set the conmode to 3215 so that the device recognition 171 * will set the cu_type of the console to 3215. If the 172 * conmode is 3270 and we don't set it back then both 173 * 3215 and the 3270 driver will try to access the console 174 * device (3215 as console and 3270 as normal tty). 175 */ 176 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 177 if (ptr == NULL) { 178 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 179 SET_CONSOLE_SCLP; 180 #endif 181 return; 182 } 183 if (strncmp(ptr + 8, "3270", 4) == 0) { 184 #if defined(CONFIG_TN3270_CONSOLE) 185 SET_CONSOLE_3270; 186 #elif defined(CONFIG_TN3215_CONSOLE) 187 SET_CONSOLE_3215; 188 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 189 SET_CONSOLE_SCLP; 190 #endif 191 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 192 #if defined(CONFIG_TN3215_CONSOLE) 193 SET_CONSOLE_3215; 194 #elif defined(CONFIG_TN3270_CONSOLE) 195 SET_CONSOLE_3270; 196 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 197 SET_CONSOLE_SCLP; 198 #endif 199 } 200 } else { 201 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 202 SET_CONSOLE_SCLP; 203 #endif 204 } 205 } 206 207 #ifdef CONFIG_ZFCPDUMP 208 static void __init setup_zfcpdump(unsigned int console_devno) 209 { 210 static char str[41]; 211 212 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 213 return; 214 if (console_devno != -1) 215 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 216 ipl_info.data.fcp.dev_id.devno, console_devno); 217 else 218 sprintf(str, " cio_ignore=all,!0.0.%04x", 219 ipl_info.data.fcp.dev_id.devno); 220 strcat(boot_command_line, str); 221 console_loglevel = 2; 222 } 223 #else 224 static inline void setup_zfcpdump(unsigned int console_devno) {} 225 #endif /* CONFIG_ZFCPDUMP */ 226 227 /* 228 * Reboot, halt and power_off stubs. They just call _machine_restart, 229 * _machine_halt or _machine_power_off. 230 */ 231 232 void machine_restart(char *command) 233 { 234 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 235 /* 236 * Only unblank the console if we are called in enabled 237 * context or a bust_spinlocks cleared the way for us. 238 */ 239 console_unblank(); 240 _machine_restart(command); 241 } 242 243 void machine_halt(void) 244 { 245 if (!in_interrupt() || oops_in_progress) 246 /* 247 * Only unblank the console if we are called in enabled 248 * context or a bust_spinlocks cleared the way for us. 249 */ 250 console_unblank(); 251 _machine_halt(); 252 } 253 254 void machine_power_off(void) 255 { 256 if (!in_interrupt() || oops_in_progress) 257 /* 258 * Only unblank the console if we are called in enabled 259 * context or a bust_spinlocks cleared the way for us. 260 */ 261 console_unblank(); 262 _machine_power_off(); 263 } 264 265 /* 266 * Dummy power off function. 267 */ 268 void (*pm_power_off)(void) = machine_power_off; 269 270 static int __init early_parse_mem(char *p) 271 { 272 memory_end = memparse(p, &p); 273 memory_end_set = 1; 274 return 0; 275 } 276 early_param("mem", early_parse_mem); 277 278 unsigned int user_mode = HOME_SPACE_MODE; 279 EXPORT_SYMBOL_GPL(user_mode); 280 281 static int set_amode_primary(void) 282 { 283 psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME; 284 psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY; 285 #ifdef CONFIG_COMPAT 286 psw32_user_bits = 287 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY; 288 #endif 289 290 if (MACHINE_HAS_MVCOS) { 291 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 292 return 1; 293 } else { 294 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 295 return 0; 296 } 297 } 298 299 /* 300 * Switch kernel/user addressing modes? 301 */ 302 static int __init early_parse_switch_amode(char *p) 303 { 304 user_mode = PRIMARY_SPACE_MODE; 305 return 0; 306 } 307 early_param("switch_amode", early_parse_switch_amode); 308 309 static int __init early_parse_user_mode(char *p) 310 { 311 if (p && strcmp(p, "primary") == 0) 312 user_mode = PRIMARY_SPACE_MODE; 313 else if (!p || strcmp(p, "home") == 0) 314 user_mode = HOME_SPACE_MODE; 315 else 316 return 1; 317 return 0; 318 } 319 early_param("user_mode", early_parse_user_mode); 320 321 static void setup_addressing_mode(void) 322 { 323 if (user_mode == PRIMARY_SPACE_MODE) { 324 if (set_amode_primary()) 325 pr_info("Address spaces switched, " 326 "mvcos available\n"); 327 else 328 pr_info("Address spaces switched, " 329 "mvcos not available\n"); 330 } 331 } 332 333 static void __init 334 setup_lowcore(void) 335 { 336 struct _lowcore *lc; 337 338 /* 339 * Setup lowcore for boot cpu 340 */ 341 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); 342 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 343 lc->restart_psw.mask = psw_kernel_bits; 344 lc->restart_psw.addr = 345 PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler; 346 lc->external_new_psw.mask = psw_kernel_bits | 347 PSW_MASK_DAT | PSW_MASK_MCHECK; 348 lc->external_new_psw.addr = 349 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 350 lc->svc_new_psw.mask = psw_kernel_bits | 351 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 352 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 353 lc->program_new_psw.mask = psw_kernel_bits | 354 PSW_MASK_DAT | PSW_MASK_MCHECK; 355 lc->program_new_psw.addr = 356 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler; 357 lc->mcck_new_psw.mask = psw_kernel_bits; 358 lc->mcck_new_psw.addr = 359 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 360 lc->io_new_psw.mask = psw_kernel_bits | 361 PSW_MASK_DAT | PSW_MASK_MCHECK; 362 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 363 lc->clock_comparator = -1ULL; 364 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 365 lc->async_stack = (unsigned long) 366 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 367 lc->panic_stack = (unsigned long) 368 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 369 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 370 lc->thread_info = (unsigned long) &init_thread_union; 371 lc->machine_flags = S390_lowcore.machine_flags; 372 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 373 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 374 MAX_FACILITY_BIT/8); 375 #ifndef CONFIG_64BIT 376 if (MACHINE_HAS_IEEE) { 377 lc->extended_save_area_addr = (__u32) 378 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0); 379 /* enable extended save area */ 380 __ctl_set_bit(14, 29); 381 } 382 #else 383 lc->cmf_hpp = -1ULL; 384 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 385 #endif 386 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 387 lc->async_enter_timer = S390_lowcore.async_enter_timer; 388 lc->exit_timer = S390_lowcore.exit_timer; 389 lc->user_timer = S390_lowcore.user_timer; 390 lc->system_timer = S390_lowcore.system_timer; 391 lc->steal_timer = S390_lowcore.steal_timer; 392 lc->last_update_timer = S390_lowcore.last_update_timer; 393 lc->last_update_clock = S390_lowcore.last_update_clock; 394 lc->ftrace_func = S390_lowcore.ftrace_func; 395 set_prefix((u32)(unsigned long) lc); 396 lowcore_ptr[0] = lc; 397 } 398 399 static struct resource code_resource = { 400 .name = "Kernel code", 401 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 402 }; 403 404 static struct resource data_resource = { 405 .name = "Kernel data", 406 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 407 }; 408 409 static struct resource bss_resource = { 410 .name = "Kernel bss", 411 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 412 }; 413 414 static struct resource __initdata *standard_resources[] = { 415 &code_resource, 416 &data_resource, 417 &bss_resource, 418 }; 419 420 static void __init setup_resources(void) 421 { 422 struct resource *res, *std_res, *sub_res; 423 int i, j; 424 425 code_resource.start = (unsigned long) &_text; 426 code_resource.end = (unsigned long) &_etext - 1; 427 data_resource.start = (unsigned long) &_etext; 428 data_resource.end = (unsigned long) &_edata - 1; 429 bss_resource.start = (unsigned long) &__bss_start; 430 bss_resource.end = (unsigned long) &__bss_stop - 1; 431 432 for (i = 0; i < MEMORY_CHUNKS; i++) { 433 if (!memory_chunk[i].size) 434 continue; 435 if (memory_chunk[i].type == CHUNK_OLDMEM || 436 memory_chunk[i].type == CHUNK_CRASHK) 437 continue; 438 res = alloc_bootmem_low(sizeof(*res)); 439 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 440 switch (memory_chunk[i].type) { 441 case CHUNK_READ_WRITE: 442 case CHUNK_CRASHK: 443 res->name = "System RAM"; 444 break; 445 case CHUNK_READ_ONLY: 446 res->name = "System ROM"; 447 res->flags |= IORESOURCE_READONLY; 448 break; 449 default: 450 res->name = "reserved"; 451 } 452 res->start = memory_chunk[i].addr; 453 res->end = res->start + memory_chunk[i].size - 1; 454 request_resource(&iomem_resource, res); 455 456 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 457 std_res = standard_resources[j]; 458 if (std_res->start < res->start || 459 std_res->start > res->end) 460 continue; 461 if (std_res->end > res->end) { 462 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 463 *sub_res = *std_res; 464 sub_res->end = res->end; 465 std_res->start = res->end + 1; 466 request_resource(res, sub_res); 467 } else { 468 request_resource(res, std_res); 469 } 470 } 471 } 472 } 473 474 unsigned long real_memory_size; 475 EXPORT_SYMBOL_GPL(real_memory_size); 476 477 static void __init setup_memory_end(void) 478 { 479 unsigned long memory_size; 480 unsigned long max_mem; 481 int i; 482 483 484 #ifdef CONFIG_ZFCPDUMP 485 if (ipl_info.type == IPL_TYPE_FCP_DUMP) { 486 memory_end = ZFCPDUMP_HSA_SIZE; 487 memory_end_set = 1; 488 } 489 #endif 490 memory_size = 0; 491 memory_end &= PAGE_MASK; 492 493 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 494 memory_end = min(max_mem, memory_end); 495 496 /* 497 * Make sure all chunks are MAX_ORDER aligned so we don't need the 498 * extra checks that HOLES_IN_ZONE would require. 499 */ 500 for (i = 0; i < MEMORY_CHUNKS; i++) { 501 unsigned long start, end; 502 struct mem_chunk *chunk; 503 unsigned long align; 504 505 chunk = &memory_chunk[i]; 506 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 507 start = (chunk->addr + align - 1) & ~(align - 1); 508 end = (chunk->addr + chunk->size) & ~(align - 1); 509 if (start >= end) 510 memset(chunk, 0, sizeof(*chunk)); 511 else { 512 chunk->addr = start; 513 chunk->size = end - start; 514 } 515 } 516 517 for (i = 0; i < MEMORY_CHUNKS; i++) { 518 struct mem_chunk *chunk = &memory_chunk[i]; 519 520 real_memory_size = max(real_memory_size, 521 chunk->addr + chunk->size); 522 if (chunk->addr >= max_mem) { 523 memset(chunk, 0, sizeof(*chunk)); 524 continue; 525 } 526 if (chunk->addr + chunk->size > max_mem) 527 chunk->size = max_mem - chunk->addr; 528 memory_size = max(memory_size, chunk->addr + chunk->size); 529 } 530 if (!memory_end) 531 memory_end = memory_size; 532 } 533 534 void *restart_stack __attribute__((__section__(".data"))); 535 536 /* 537 * Setup new PSW and allocate stack for PSW restart interrupt 538 */ 539 static void __init setup_restart_psw(void) 540 { 541 psw_t psw; 542 543 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 544 restart_stack += ASYNC_SIZE; 545 546 /* 547 * Setup restart PSW for absolute zero lowcore. This is necesary 548 * if PSW restart is done on an offline CPU that has lowcore zero 549 */ 550 psw.mask = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA; 551 psw.addr = PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler; 552 copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw)); 553 } 554 555 static void __init setup_vmcoreinfo(void) 556 { 557 #ifdef CONFIG_KEXEC 558 unsigned long ptr = paddr_vmcoreinfo_note(); 559 560 copy_to_absolute_zero(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr)); 561 #endif 562 } 563 564 #ifdef CONFIG_CRASH_DUMP 565 566 /* 567 * Find suitable location for crashkernel memory 568 */ 569 static unsigned long __init find_crash_base(unsigned long crash_size, 570 char **msg) 571 { 572 unsigned long crash_base; 573 struct mem_chunk *chunk; 574 int i; 575 576 if (memory_chunk[0].size < crash_size) { 577 *msg = "first memory chunk must be at least crashkernel size"; 578 return 0; 579 } 580 if (is_kdump_kernel() && (crash_size == OLDMEM_SIZE)) 581 return OLDMEM_BASE; 582 583 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) { 584 chunk = &memory_chunk[i]; 585 if (chunk->size == 0) 586 continue; 587 if (chunk->type != CHUNK_READ_WRITE) 588 continue; 589 if (chunk->size < crash_size) 590 continue; 591 crash_base = (chunk->addr + chunk->size) - crash_size; 592 if (crash_base < crash_size) 593 continue; 594 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX) 595 continue; 596 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE) 597 continue; 598 return crash_base; 599 } 600 *msg = "no suitable area found"; 601 return 0; 602 } 603 604 /* 605 * Check if crash_base and crash_size is valid 606 */ 607 static int __init verify_crash_base(unsigned long crash_base, 608 unsigned long crash_size, 609 char **msg) 610 { 611 struct mem_chunk *chunk; 612 int i; 613 614 /* 615 * Because we do the swap to zero, we must have at least 'crash_size' 616 * bytes free space before crash_base 617 */ 618 if (crash_size > crash_base) { 619 *msg = "crashkernel offset must be greater than size"; 620 return -EINVAL; 621 } 622 623 /* First memory chunk must be at least crash_size */ 624 if (memory_chunk[0].size < crash_size) { 625 *msg = "first memory chunk must be at least crashkernel size"; 626 return -EINVAL; 627 } 628 /* Check if we fit into the respective memory chunk */ 629 for (i = 0; i < MEMORY_CHUNKS; i++) { 630 chunk = &memory_chunk[i]; 631 if (chunk->size == 0) 632 continue; 633 if (crash_base < chunk->addr) 634 continue; 635 if (crash_base >= chunk->addr + chunk->size) 636 continue; 637 /* we have found the memory chunk */ 638 if (crash_base + crash_size > chunk->addr + chunk->size) { 639 *msg = "selected memory chunk is too small for " 640 "crashkernel memory"; 641 return -EINVAL; 642 } 643 return 0; 644 } 645 *msg = "invalid memory range specified"; 646 return -EINVAL; 647 } 648 649 /* 650 * Reserve kdump memory by creating a memory hole in the mem_chunk array 651 */ 652 static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size, 653 int type) 654 { 655 656 create_mem_hole(memory_chunk, addr, size, type); 657 } 658 659 /* 660 * When kdump is enabled, we have to ensure that no memory from 661 * the area [0 - crashkernel memory size] and 662 * [crashk_res.start - crashk_res.end] is set offline. 663 */ 664 static int kdump_mem_notifier(struct notifier_block *nb, 665 unsigned long action, void *data) 666 { 667 struct memory_notify *arg = data; 668 669 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 670 return NOTIFY_BAD; 671 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 672 return NOTIFY_OK; 673 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 674 return NOTIFY_OK; 675 return NOTIFY_BAD; 676 } 677 678 static struct notifier_block kdump_mem_nb = { 679 .notifier_call = kdump_mem_notifier, 680 }; 681 682 #endif 683 684 /* 685 * Make sure that oldmem, where the dump is stored, is protected 686 */ 687 static void reserve_oldmem(void) 688 { 689 #ifdef CONFIG_CRASH_DUMP 690 if (!OLDMEM_BASE) 691 return; 692 693 reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM); 694 reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE, 695 CHUNK_OLDMEM); 696 if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size) 697 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1; 698 else 699 saved_max_pfn = PFN_DOWN(real_memory_size) - 1; 700 #endif 701 } 702 703 /* 704 * Reserve memory for kdump kernel to be loaded with kexec 705 */ 706 static void __init reserve_crashkernel(void) 707 { 708 #ifdef CONFIG_CRASH_DUMP 709 unsigned long long crash_base, crash_size; 710 char *msg; 711 int rc; 712 713 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 714 &crash_base); 715 if (rc || crash_size == 0) 716 return; 717 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 718 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 719 if (register_memory_notifier(&kdump_mem_nb)) 720 return; 721 if (!crash_base) 722 crash_base = find_crash_base(crash_size, &msg); 723 if (!crash_base) { 724 pr_info("crashkernel reservation failed: %s\n", msg); 725 unregister_memory_notifier(&kdump_mem_nb); 726 return; 727 } 728 if (verify_crash_base(crash_base, crash_size, &msg)) { 729 pr_info("crashkernel reservation failed: %s\n", msg); 730 unregister_memory_notifier(&kdump_mem_nb); 731 return; 732 } 733 if (!OLDMEM_BASE && MACHINE_IS_VM) 734 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 735 crashk_res.start = crash_base; 736 crashk_res.end = crash_base + crash_size - 1; 737 insert_resource(&iomem_resource, &crashk_res); 738 reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK); 739 pr_info("Reserving %lluMB of memory at %lluMB " 740 "for crashkernel (System RAM: %luMB)\n", 741 crash_size >> 20, crash_base >> 20, memory_end >> 20); 742 #endif 743 } 744 745 static void __init 746 setup_memory(void) 747 { 748 unsigned long bootmap_size; 749 unsigned long start_pfn, end_pfn; 750 int i; 751 752 /* 753 * partially used pages are not usable - thus 754 * we are rounding upwards: 755 */ 756 start_pfn = PFN_UP(__pa(&_end)); 757 end_pfn = max_pfn = PFN_DOWN(memory_end); 758 759 #ifdef CONFIG_BLK_DEV_INITRD 760 /* 761 * Move the initrd in case the bitmap of the bootmem allocater 762 * would overwrite it. 763 */ 764 765 if (INITRD_START && INITRD_SIZE) { 766 unsigned long bmap_size; 767 unsigned long start; 768 769 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 770 bmap_size = PFN_PHYS(bmap_size); 771 772 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 773 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 774 775 #ifdef CONFIG_CRASH_DUMP 776 if (OLDMEM_BASE) { 777 /* Move initrd behind kdump oldmem */ 778 if (start + INITRD_SIZE > OLDMEM_BASE && 779 start < OLDMEM_BASE + OLDMEM_SIZE) 780 start = OLDMEM_BASE + OLDMEM_SIZE; 781 } 782 #endif 783 if (start + INITRD_SIZE > memory_end) { 784 pr_err("initrd extends beyond end of " 785 "memory (0x%08lx > 0x%08lx) " 786 "disabling initrd\n", 787 start + INITRD_SIZE, memory_end); 788 INITRD_START = INITRD_SIZE = 0; 789 } else { 790 pr_info("Moving initrd (0x%08lx -> " 791 "0x%08lx, size: %ld)\n", 792 INITRD_START, start, INITRD_SIZE); 793 memmove((void *) start, (void *) INITRD_START, 794 INITRD_SIZE); 795 INITRD_START = start; 796 } 797 } 798 } 799 #endif 800 801 /* 802 * Initialize the boot-time allocator 803 */ 804 bootmap_size = init_bootmem(start_pfn, end_pfn); 805 806 /* 807 * Register RAM areas with the bootmem allocator. 808 */ 809 810 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 811 unsigned long start_chunk, end_chunk, pfn; 812 813 if (memory_chunk[i].type != CHUNK_READ_WRITE && 814 memory_chunk[i].type != CHUNK_CRASHK) 815 continue; 816 start_chunk = PFN_DOWN(memory_chunk[i].addr); 817 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 818 end_chunk = min(end_chunk, end_pfn); 819 if (start_chunk >= end_chunk) 820 continue; 821 add_active_range(0, start_chunk, end_chunk); 822 pfn = max(start_chunk, start_pfn); 823 for (; pfn < end_chunk; pfn++) 824 page_set_storage_key(PFN_PHYS(pfn), 825 PAGE_DEFAULT_KEY, 0); 826 } 827 828 psw_set_key(PAGE_DEFAULT_KEY); 829 830 free_bootmem_with_active_regions(0, max_pfn); 831 832 /* 833 * Reserve memory used for lowcore/command line/kernel image. 834 */ 835 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 836 reserve_bootmem((unsigned long)_stext, 837 PFN_PHYS(start_pfn) - (unsigned long)_stext, 838 BOOTMEM_DEFAULT); 839 /* 840 * Reserve the bootmem bitmap itself as well. We do this in two 841 * steps (first step was init_bootmem()) because this catches 842 * the (very unlikely) case of us accidentally initializing the 843 * bootmem allocator with an invalid RAM area. 844 */ 845 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 846 BOOTMEM_DEFAULT); 847 848 #ifdef CONFIG_CRASH_DUMP 849 if (crashk_res.start) 850 reserve_bootmem(crashk_res.start, 851 crashk_res.end - crashk_res.start + 1, 852 BOOTMEM_DEFAULT); 853 if (is_kdump_kernel()) 854 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE, 855 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT); 856 #endif 857 #ifdef CONFIG_BLK_DEV_INITRD 858 if (INITRD_START && INITRD_SIZE) { 859 if (INITRD_START + INITRD_SIZE <= memory_end) { 860 reserve_bootmem(INITRD_START, INITRD_SIZE, 861 BOOTMEM_DEFAULT); 862 initrd_start = INITRD_START; 863 initrd_end = initrd_start + INITRD_SIZE; 864 } else { 865 pr_err("initrd extends beyond end of " 866 "memory (0x%08lx > 0x%08lx) " 867 "disabling initrd\n", 868 initrd_start + INITRD_SIZE, memory_end); 869 initrd_start = initrd_end = 0; 870 } 871 } 872 #endif 873 } 874 875 /* 876 * Setup hardware capabilities. 877 */ 878 static void __init setup_hwcaps(void) 879 { 880 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 881 struct cpuid cpu_id; 882 int i; 883 884 /* 885 * The store facility list bits numbers as found in the principles 886 * of operation are numbered with bit 1UL<<31 as number 0 to 887 * bit 1UL<<0 as number 31. 888 * Bit 0: instructions named N3, "backported" to esa-mode 889 * Bit 2: z/Architecture mode is active 890 * Bit 7: the store-facility-list-extended facility is installed 891 * Bit 17: the message-security assist is installed 892 * Bit 19: the long-displacement facility is installed 893 * Bit 21: the extended-immediate facility is installed 894 * Bit 22: extended-translation facility 3 is installed 895 * Bit 30: extended-translation facility 3 enhancement facility 896 * These get translated to: 897 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 898 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 899 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 900 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 901 */ 902 for (i = 0; i < 6; i++) 903 if (test_facility(stfl_bits[i])) 904 elf_hwcap |= 1UL << i; 905 906 if (test_facility(22) && test_facility(30)) 907 elf_hwcap |= HWCAP_S390_ETF3EH; 908 909 /* 910 * Check for additional facilities with store-facility-list-extended. 911 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 912 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 913 * as stored by stfl, bits 32-xxx contain additional facilities. 914 * How many facility words are stored depends on the number of 915 * doublewords passed to the instruction. The additional facilities 916 * are: 917 * Bit 42: decimal floating point facility is installed 918 * Bit 44: perform floating point operation facility is installed 919 * translated to: 920 * HWCAP_S390_DFP bit 6 (42 && 44). 921 */ 922 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 923 elf_hwcap |= HWCAP_S390_DFP; 924 925 /* 926 * Huge page support HWCAP_S390_HPAGE is bit 7. 927 */ 928 if (MACHINE_HAS_HPAGE) 929 elf_hwcap |= HWCAP_S390_HPAGE; 930 931 /* 932 * 64-bit register support for 31-bit processes 933 * HWCAP_S390_HIGH_GPRS is bit 9. 934 */ 935 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 936 937 get_cpu_id(&cpu_id); 938 switch (cpu_id.machine) { 939 case 0x9672: 940 #if !defined(CONFIG_64BIT) 941 default: /* Use "g5" as default for 31 bit kernels. */ 942 #endif 943 strcpy(elf_platform, "g5"); 944 break; 945 case 0x2064: 946 case 0x2066: 947 #if defined(CONFIG_64BIT) 948 default: /* Use "z900" as default for 64 bit kernels. */ 949 #endif 950 strcpy(elf_platform, "z900"); 951 break; 952 case 0x2084: 953 case 0x2086: 954 strcpy(elf_platform, "z990"); 955 break; 956 case 0x2094: 957 case 0x2096: 958 strcpy(elf_platform, "z9-109"); 959 break; 960 case 0x2097: 961 case 0x2098: 962 strcpy(elf_platform, "z10"); 963 break; 964 case 0x2817: 965 case 0x2818: 966 strcpy(elf_platform, "z196"); 967 break; 968 } 969 } 970 971 /* 972 * Setup function called from init/main.c just after the banner 973 * was printed. 974 */ 975 976 void __init 977 setup_arch(char **cmdline_p) 978 { 979 /* 980 * print what head.S has found out about the machine 981 */ 982 #ifndef CONFIG_64BIT 983 if (MACHINE_IS_VM) 984 pr_info("Linux is running as a z/VM " 985 "guest operating system in 31-bit mode\n"); 986 else if (MACHINE_IS_LPAR) 987 pr_info("Linux is running natively in 31-bit mode\n"); 988 if (MACHINE_HAS_IEEE) 989 pr_info("The hardware system has IEEE compatible " 990 "floating point units\n"); 991 else 992 pr_info("The hardware system has no IEEE compatible " 993 "floating point units\n"); 994 #else /* CONFIG_64BIT */ 995 if (MACHINE_IS_VM) 996 pr_info("Linux is running as a z/VM " 997 "guest operating system in 64-bit mode\n"); 998 else if (MACHINE_IS_KVM) 999 pr_info("Linux is running under KVM in 64-bit mode\n"); 1000 else if (MACHINE_IS_LPAR) 1001 pr_info("Linux is running natively in 64-bit mode\n"); 1002 #endif /* CONFIG_64BIT */ 1003 1004 /* Have one command line that is parsed and saved in /proc/cmdline */ 1005 /* boot_command_line has been already set up in early.c */ 1006 *cmdline_p = boot_command_line; 1007 1008 ROOT_DEV = Root_RAM0; 1009 1010 init_mm.start_code = PAGE_OFFSET; 1011 init_mm.end_code = (unsigned long) &_etext; 1012 init_mm.end_data = (unsigned long) &_edata; 1013 init_mm.brk = (unsigned long) &_end; 1014 1015 if (MACHINE_HAS_MVCOS) 1016 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 1017 else 1018 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 1019 1020 parse_early_param(); 1021 1022 setup_ipl(); 1023 setup_memory_end(); 1024 setup_addressing_mode(); 1025 reserve_oldmem(); 1026 reserve_crashkernel(); 1027 setup_memory(); 1028 setup_resources(); 1029 setup_vmcoreinfo(); 1030 setup_restart_psw(); 1031 setup_lowcore(); 1032 1033 cpu_init(); 1034 s390_init_cpu_topology(); 1035 1036 /* 1037 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 1038 */ 1039 setup_hwcaps(); 1040 1041 /* 1042 * Create kernel page tables and switch to virtual addressing. 1043 */ 1044 paging_init(); 1045 1046 /* Setup default console */ 1047 conmode_default(); 1048 set_preferred_console(); 1049 1050 /* Setup zfcpdump support */ 1051 setup_zfcpdump(console_devno); 1052 } 1053