1 /* 2 * arch/s390/kernel/setup.c 3 * 4 * S390 version 5 * Copyright (C) IBM Corp. 1999,2012 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/memblock.h> 25 #include <linux/mm.h> 26 #include <linux/stddef.h> 27 #include <linux/unistd.h> 28 #include <linux/ptrace.h> 29 #include <linux/user.h> 30 #include <linux/tty.h> 31 #include <linux/ioport.h> 32 #include <linux/delay.h> 33 #include <linux/init.h> 34 #include <linux/initrd.h> 35 #include <linux/bootmem.h> 36 #include <linux/root_dev.h> 37 #include <linux/console.h> 38 #include <linux/kernel_stat.h> 39 #include <linux/device.h> 40 #include <linux/notifier.h> 41 #include <linux/pfn.h> 42 #include <linux/ctype.h> 43 #include <linux/reboot.h> 44 #include <linux/topology.h> 45 #include <linux/ftrace.h> 46 #include <linux/kexec.h> 47 #include <linux/crash_dump.h> 48 #include <linux/memory.h> 49 #include <linux/compat.h> 50 51 #include <asm/ipl.h> 52 #include <asm/uaccess.h> 53 #include <asm/smp.h> 54 #include <asm/mmu_context.h> 55 #include <asm/cpcmd.h> 56 #include <asm/lowcore.h> 57 #include <asm/irq.h> 58 #include <asm/page.h> 59 #include <asm/ptrace.h> 60 #include <asm/sections.h> 61 #include <asm/ebcdic.h> 62 #include <asm/kvm_virtio.h> 63 #include <asm/diag.h> 64 #include <asm/os_info.h> 65 #include "entry.h" 66 67 long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY | 68 PSW_MASK_EA | PSW_MASK_BA; 69 long psw_user_bits = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | 70 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK | 71 PSW_MASK_PSTATE | PSW_ASC_HOME; 72 73 /* 74 * User copy operations. 75 */ 76 struct uaccess_ops uaccess; 77 EXPORT_SYMBOL(uaccess); 78 79 /* 80 * Machine setup.. 81 */ 82 unsigned int console_mode = 0; 83 EXPORT_SYMBOL(console_mode); 84 85 unsigned int console_devno = -1; 86 EXPORT_SYMBOL(console_devno); 87 88 unsigned int console_irq = -1; 89 EXPORT_SYMBOL(console_irq); 90 91 unsigned long elf_hwcap = 0; 92 char elf_platform[ELF_PLATFORM_SIZE]; 93 94 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS]; 95 96 int __initdata memory_end_set; 97 unsigned long __initdata memory_end; 98 99 unsigned long VMALLOC_START; 100 EXPORT_SYMBOL(VMALLOC_START); 101 102 unsigned long VMALLOC_END; 103 EXPORT_SYMBOL(VMALLOC_END); 104 105 struct page *vmemmap; 106 EXPORT_SYMBOL(vmemmap); 107 108 /* An array with a pointer to the lowcore of every CPU. */ 109 struct _lowcore *lowcore_ptr[NR_CPUS]; 110 EXPORT_SYMBOL(lowcore_ptr); 111 112 /* 113 * This is set up by the setup-routine at boot-time 114 * for S390 need to find out, what we have to setup 115 * using address 0x10400 ... 116 */ 117 118 #include <asm/setup.h> 119 120 /* 121 * condev= and conmode= setup parameter. 122 */ 123 124 static int __init condev_setup(char *str) 125 { 126 int vdev; 127 128 vdev = simple_strtoul(str, &str, 0); 129 if (vdev >= 0 && vdev < 65536) { 130 console_devno = vdev; 131 console_irq = -1; 132 } 133 return 1; 134 } 135 136 __setup("condev=", condev_setup); 137 138 static void __init set_preferred_console(void) 139 { 140 if (MACHINE_IS_KVM) 141 add_preferred_console("hvc", 0, NULL); 142 else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 143 add_preferred_console("ttyS", 0, NULL); 144 else if (CONSOLE_IS_3270) 145 add_preferred_console("tty3270", 0, NULL); 146 } 147 148 static int __init conmode_setup(char *str) 149 { 150 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 151 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 152 SET_CONSOLE_SCLP; 153 #endif 154 #if defined(CONFIG_TN3215_CONSOLE) 155 if (strncmp(str, "3215", 5) == 0) 156 SET_CONSOLE_3215; 157 #endif 158 #if defined(CONFIG_TN3270_CONSOLE) 159 if (strncmp(str, "3270", 5) == 0) 160 SET_CONSOLE_3270; 161 #endif 162 set_preferred_console(); 163 return 1; 164 } 165 166 __setup("conmode=", conmode_setup); 167 168 static void __init conmode_default(void) 169 { 170 char query_buffer[1024]; 171 char *ptr; 172 173 if (MACHINE_IS_VM) { 174 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 175 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 176 ptr = strstr(query_buffer, "SUBCHANNEL ="); 177 console_irq = simple_strtoul(ptr + 13, NULL, 16); 178 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 179 ptr = strstr(query_buffer, "CONMODE"); 180 /* 181 * Set the conmode to 3215 so that the device recognition 182 * will set the cu_type of the console to 3215. If the 183 * conmode is 3270 and we don't set it back then both 184 * 3215 and the 3270 driver will try to access the console 185 * device (3215 as console and 3270 as normal tty). 186 */ 187 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 188 if (ptr == NULL) { 189 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 190 SET_CONSOLE_SCLP; 191 #endif 192 return; 193 } 194 if (strncmp(ptr + 8, "3270", 4) == 0) { 195 #if defined(CONFIG_TN3270_CONSOLE) 196 SET_CONSOLE_3270; 197 #elif defined(CONFIG_TN3215_CONSOLE) 198 SET_CONSOLE_3215; 199 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 200 SET_CONSOLE_SCLP; 201 #endif 202 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 203 #if defined(CONFIG_TN3215_CONSOLE) 204 SET_CONSOLE_3215; 205 #elif defined(CONFIG_TN3270_CONSOLE) 206 SET_CONSOLE_3270; 207 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 208 SET_CONSOLE_SCLP; 209 #endif 210 } 211 } else { 212 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 213 SET_CONSOLE_SCLP; 214 #endif 215 } 216 } 217 218 #ifdef CONFIG_ZFCPDUMP 219 static void __init setup_zfcpdump(unsigned int console_devno) 220 { 221 static char str[41]; 222 223 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 224 return; 225 if (OLDMEM_BASE) 226 return; 227 if (console_devno != -1) 228 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 229 ipl_info.data.fcp.dev_id.devno, console_devno); 230 else 231 sprintf(str, " cio_ignore=all,!0.0.%04x", 232 ipl_info.data.fcp.dev_id.devno); 233 strcat(boot_command_line, str); 234 console_loglevel = 2; 235 } 236 #else 237 static inline void setup_zfcpdump(unsigned int console_devno) {} 238 #endif /* CONFIG_ZFCPDUMP */ 239 240 /* 241 * Reboot, halt and power_off stubs. They just call _machine_restart, 242 * _machine_halt or _machine_power_off. 243 */ 244 245 void machine_restart(char *command) 246 { 247 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 248 /* 249 * Only unblank the console if we are called in enabled 250 * context or a bust_spinlocks cleared the way for us. 251 */ 252 console_unblank(); 253 _machine_restart(command); 254 } 255 256 void machine_halt(void) 257 { 258 if (!in_interrupt() || oops_in_progress) 259 /* 260 * Only unblank the console if we are called in enabled 261 * context or a bust_spinlocks cleared the way for us. 262 */ 263 console_unblank(); 264 _machine_halt(); 265 } 266 267 void machine_power_off(void) 268 { 269 if (!in_interrupt() || oops_in_progress) 270 /* 271 * Only unblank the console if we are called in enabled 272 * context or a bust_spinlocks cleared the way for us. 273 */ 274 console_unblank(); 275 _machine_power_off(); 276 } 277 278 /* 279 * Dummy power off function. 280 */ 281 void (*pm_power_off)(void) = machine_power_off; 282 283 static int __init early_parse_mem(char *p) 284 { 285 memory_end = memparse(p, &p); 286 memory_end_set = 1; 287 return 0; 288 } 289 early_param("mem", early_parse_mem); 290 291 static int __init parse_vmalloc(char *arg) 292 { 293 if (!arg) 294 return -EINVAL; 295 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 296 return 0; 297 } 298 early_param("vmalloc", parse_vmalloc); 299 300 unsigned int user_mode = HOME_SPACE_MODE; 301 EXPORT_SYMBOL_GPL(user_mode); 302 303 static int set_amode_primary(void) 304 { 305 psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME; 306 psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY; 307 #ifdef CONFIG_COMPAT 308 psw32_user_bits = 309 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY; 310 #endif 311 312 if (MACHINE_HAS_MVCOS) { 313 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 314 return 1; 315 } else { 316 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 317 return 0; 318 } 319 } 320 321 /* 322 * Switch kernel/user addressing modes? 323 */ 324 static int __init early_parse_switch_amode(char *p) 325 { 326 user_mode = PRIMARY_SPACE_MODE; 327 return 0; 328 } 329 early_param("switch_amode", early_parse_switch_amode); 330 331 static int __init early_parse_user_mode(char *p) 332 { 333 if (p && strcmp(p, "primary") == 0) 334 user_mode = PRIMARY_SPACE_MODE; 335 else if (!p || strcmp(p, "home") == 0) 336 user_mode = HOME_SPACE_MODE; 337 else 338 return 1; 339 return 0; 340 } 341 early_param("user_mode", early_parse_user_mode); 342 343 static void setup_addressing_mode(void) 344 { 345 if (user_mode == PRIMARY_SPACE_MODE) { 346 if (set_amode_primary()) 347 pr_info("Address spaces switched, " 348 "mvcos available\n"); 349 else 350 pr_info("Address spaces switched, " 351 "mvcos not available\n"); 352 } 353 } 354 355 void *restart_stack __attribute__((__section__(".data"))); 356 357 static void __init setup_lowcore(void) 358 { 359 struct _lowcore *lc; 360 361 /* 362 * Setup lowcore for boot cpu 363 */ 364 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); 365 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 366 lc->restart_psw.mask = psw_kernel_bits; 367 lc->restart_psw.addr = 368 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 369 lc->external_new_psw.mask = psw_kernel_bits | 370 PSW_MASK_DAT | PSW_MASK_MCHECK; 371 lc->external_new_psw.addr = 372 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 373 lc->svc_new_psw.mask = psw_kernel_bits | 374 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 375 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 376 lc->program_new_psw.mask = psw_kernel_bits | 377 PSW_MASK_DAT | PSW_MASK_MCHECK; 378 lc->program_new_psw.addr = 379 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler; 380 lc->mcck_new_psw.mask = psw_kernel_bits; 381 lc->mcck_new_psw.addr = 382 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 383 lc->io_new_psw.mask = psw_kernel_bits | 384 PSW_MASK_DAT | PSW_MASK_MCHECK; 385 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 386 lc->clock_comparator = -1ULL; 387 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 388 lc->async_stack = (unsigned long) 389 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 390 lc->panic_stack = (unsigned long) 391 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 392 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 393 lc->thread_info = (unsigned long) &init_thread_union; 394 lc->machine_flags = S390_lowcore.machine_flags; 395 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 396 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 397 MAX_FACILITY_BIT/8); 398 #ifndef CONFIG_64BIT 399 if (MACHINE_HAS_IEEE) { 400 lc->extended_save_area_addr = (__u32) 401 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0); 402 /* enable extended save area */ 403 __ctl_set_bit(14, 29); 404 } 405 #else 406 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 407 #endif 408 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 409 lc->async_enter_timer = S390_lowcore.async_enter_timer; 410 lc->exit_timer = S390_lowcore.exit_timer; 411 lc->user_timer = S390_lowcore.user_timer; 412 lc->system_timer = S390_lowcore.system_timer; 413 lc->steal_timer = S390_lowcore.steal_timer; 414 lc->last_update_timer = S390_lowcore.last_update_timer; 415 lc->last_update_clock = S390_lowcore.last_update_clock; 416 lc->ftrace_func = S390_lowcore.ftrace_func; 417 418 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 419 restart_stack += ASYNC_SIZE; 420 421 /* 422 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 423 * restart data to the absolute zero lowcore. This is necesary if 424 * PSW restart is done on an offline CPU that has lowcore zero. 425 */ 426 lc->restart_stack = (unsigned long) restart_stack; 427 lc->restart_fn = (unsigned long) do_restart; 428 lc->restart_data = 0; 429 lc->restart_source = -1UL; 430 memcpy(&S390_lowcore.restart_stack, &lc->restart_stack, 431 4*sizeof(unsigned long)); 432 copy_to_absolute_zero(&S390_lowcore.restart_psw, 433 &lc->restart_psw, sizeof(psw_t)); 434 435 set_prefix((u32)(unsigned long) lc); 436 lowcore_ptr[0] = lc; 437 } 438 439 static struct resource code_resource = { 440 .name = "Kernel code", 441 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 442 }; 443 444 static struct resource data_resource = { 445 .name = "Kernel data", 446 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 447 }; 448 449 static struct resource bss_resource = { 450 .name = "Kernel bss", 451 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 452 }; 453 454 static struct resource __initdata *standard_resources[] = { 455 &code_resource, 456 &data_resource, 457 &bss_resource, 458 }; 459 460 static void __init setup_resources(void) 461 { 462 struct resource *res, *std_res, *sub_res; 463 int i, j; 464 465 code_resource.start = (unsigned long) &_text; 466 code_resource.end = (unsigned long) &_etext - 1; 467 data_resource.start = (unsigned long) &_etext; 468 data_resource.end = (unsigned long) &_edata - 1; 469 bss_resource.start = (unsigned long) &__bss_start; 470 bss_resource.end = (unsigned long) &__bss_stop - 1; 471 472 for (i = 0; i < MEMORY_CHUNKS; i++) { 473 if (!memory_chunk[i].size) 474 continue; 475 if (memory_chunk[i].type == CHUNK_OLDMEM || 476 memory_chunk[i].type == CHUNK_CRASHK) 477 continue; 478 res = alloc_bootmem_low(sizeof(*res)); 479 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 480 switch (memory_chunk[i].type) { 481 case CHUNK_READ_WRITE: 482 case CHUNK_CRASHK: 483 res->name = "System RAM"; 484 break; 485 case CHUNK_READ_ONLY: 486 res->name = "System ROM"; 487 res->flags |= IORESOURCE_READONLY; 488 break; 489 default: 490 res->name = "reserved"; 491 } 492 res->start = memory_chunk[i].addr; 493 res->end = res->start + memory_chunk[i].size - 1; 494 request_resource(&iomem_resource, res); 495 496 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 497 std_res = standard_resources[j]; 498 if (std_res->start < res->start || 499 std_res->start > res->end) 500 continue; 501 if (std_res->end > res->end) { 502 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 503 *sub_res = *std_res; 504 sub_res->end = res->end; 505 std_res->start = res->end + 1; 506 request_resource(res, sub_res); 507 } else { 508 request_resource(res, std_res); 509 } 510 } 511 } 512 } 513 514 unsigned long real_memory_size; 515 EXPORT_SYMBOL_GPL(real_memory_size); 516 517 static void __init setup_memory_end(void) 518 { 519 unsigned long vmax, vmalloc_size, tmp; 520 int i; 521 522 523 #ifdef CONFIG_ZFCPDUMP 524 if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) { 525 memory_end = ZFCPDUMP_HSA_SIZE; 526 memory_end_set = 1; 527 } 528 #endif 529 real_memory_size = 0; 530 memory_end &= PAGE_MASK; 531 532 /* 533 * Make sure all chunks are MAX_ORDER aligned so we don't need the 534 * extra checks that HOLES_IN_ZONE would require. 535 */ 536 for (i = 0; i < MEMORY_CHUNKS; i++) { 537 unsigned long start, end; 538 struct mem_chunk *chunk; 539 unsigned long align; 540 541 chunk = &memory_chunk[i]; 542 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 543 start = (chunk->addr + align - 1) & ~(align - 1); 544 end = (chunk->addr + chunk->size) & ~(align - 1); 545 if (start >= end) 546 memset(chunk, 0, sizeof(*chunk)); 547 else { 548 chunk->addr = start; 549 chunk->size = end - start; 550 } 551 real_memory_size = max(real_memory_size, 552 chunk->addr + chunk->size); 553 } 554 555 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 556 #ifdef CONFIG_64BIT 557 vmalloc_size = VMALLOC_END ?: 128UL << 30; 558 tmp = (memory_end ?: real_memory_size) / PAGE_SIZE; 559 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size; 560 if (tmp <= (1UL << 42)) 561 vmax = 1UL << 42; /* 3-level kernel page table */ 562 else 563 vmax = 1UL << 53; /* 4-level kernel page table */ 564 #else 565 vmalloc_size = VMALLOC_END ?: 96UL << 20; 566 vmax = 1UL << 31; /* 2-level kernel page table */ 567 #endif 568 /* vmalloc area is at the end of the kernel address space. */ 569 VMALLOC_END = vmax; 570 VMALLOC_START = vmax - vmalloc_size; 571 572 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 573 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 574 tmp = VMALLOC_START - tmp * sizeof(struct page); 575 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 576 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 577 vmemmap = (struct page *) tmp; 578 579 /* Take care that memory_end is set and <= vmemmap */ 580 memory_end = min(memory_end ?: real_memory_size, tmp); 581 582 /* Fixup memory chunk array to fit into 0..memory_end */ 583 for (i = 0; i < MEMORY_CHUNKS; i++) { 584 struct mem_chunk *chunk = &memory_chunk[i]; 585 586 if (chunk->addr >= memory_end) { 587 memset(chunk, 0, sizeof(*chunk)); 588 continue; 589 } 590 if (chunk->addr + chunk->size > memory_end) 591 chunk->size = memory_end - chunk->addr; 592 } 593 } 594 595 static void __init setup_vmcoreinfo(void) 596 { 597 #ifdef CONFIG_KEXEC 598 unsigned long ptr = paddr_vmcoreinfo_note(); 599 600 copy_to_absolute_zero(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr)); 601 #endif 602 } 603 604 #ifdef CONFIG_CRASH_DUMP 605 606 /* 607 * Find suitable location for crashkernel memory 608 */ 609 static unsigned long __init find_crash_base(unsigned long crash_size, 610 char **msg) 611 { 612 unsigned long crash_base; 613 struct mem_chunk *chunk; 614 int i; 615 616 if (memory_chunk[0].size < crash_size) { 617 *msg = "first memory chunk must be at least crashkernel size"; 618 return 0; 619 } 620 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE) 621 return OLDMEM_BASE; 622 623 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) { 624 chunk = &memory_chunk[i]; 625 if (chunk->size == 0) 626 continue; 627 if (chunk->type != CHUNK_READ_WRITE) 628 continue; 629 if (chunk->size < crash_size) 630 continue; 631 crash_base = (chunk->addr + chunk->size) - crash_size; 632 if (crash_base < crash_size) 633 continue; 634 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX) 635 continue; 636 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE) 637 continue; 638 return crash_base; 639 } 640 *msg = "no suitable area found"; 641 return 0; 642 } 643 644 /* 645 * Check if crash_base and crash_size is valid 646 */ 647 static int __init verify_crash_base(unsigned long crash_base, 648 unsigned long crash_size, 649 char **msg) 650 { 651 struct mem_chunk *chunk; 652 int i; 653 654 /* 655 * Because we do the swap to zero, we must have at least 'crash_size' 656 * bytes free space before crash_base 657 */ 658 if (crash_size > crash_base) { 659 *msg = "crashkernel offset must be greater than size"; 660 return -EINVAL; 661 } 662 663 /* First memory chunk must be at least crash_size */ 664 if (memory_chunk[0].size < crash_size) { 665 *msg = "first memory chunk must be at least crashkernel size"; 666 return -EINVAL; 667 } 668 /* Check if we fit into the respective memory chunk */ 669 for (i = 0; i < MEMORY_CHUNKS; i++) { 670 chunk = &memory_chunk[i]; 671 if (chunk->size == 0) 672 continue; 673 if (crash_base < chunk->addr) 674 continue; 675 if (crash_base >= chunk->addr + chunk->size) 676 continue; 677 /* we have found the memory chunk */ 678 if (crash_base + crash_size > chunk->addr + chunk->size) { 679 *msg = "selected memory chunk is too small for " 680 "crashkernel memory"; 681 return -EINVAL; 682 } 683 return 0; 684 } 685 *msg = "invalid memory range specified"; 686 return -EINVAL; 687 } 688 689 /* 690 * Reserve kdump memory by creating a memory hole in the mem_chunk array 691 */ 692 static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size, 693 int type) 694 { 695 create_mem_hole(memory_chunk, addr, size, type); 696 } 697 698 /* 699 * When kdump is enabled, we have to ensure that no memory from 700 * the area [0 - crashkernel memory size] and 701 * [crashk_res.start - crashk_res.end] is set offline. 702 */ 703 static int kdump_mem_notifier(struct notifier_block *nb, 704 unsigned long action, void *data) 705 { 706 struct memory_notify *arg = data; 707 708 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 709 return NOTIFY_BAD; 710 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 711 return NOTIFY_OK; 712 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 713 return NOTIFY_OK; 714 return NOTIFY_BAD; 715 } 716 717 static struct notifier_block kdump_mem_nb = { 718 .notifier_call = kdump_mem_notifier, 719 }; 720 721 #endif 722 723 /* 724 * Make sure that oldmem, where the dump is stored, is protected 725 */ 726 static void reserve_oldmem(void) 727 { 728 #ifdef CONFIG_CRASH_DUMP 729 if (!OLDMEM_BASE) 730 return; 731 732 reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM); 733 reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE, 734 CHUNK_OLDMEM); 735 if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size) 736 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1; 737 else 738 saved_max_pfn = PFN_DOWN(real_memory_size) - 1; 739 #endif 740 } 741 742 /* 743 * Reserve memory for kdump kernel to be loaded with kexec 744 */ 745 static void __init reserve_crashkernel(void) 746 { 747 #ifdef CONFIG_CRASH_DUMP 748 unsigned long long crash_base, crash_size; 749 char *msg = NULL; 750 int rc; 751 752 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 753 &crash_base); 754 if (rc || crash_size == 0) 755 return; 756 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 757 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 758 if (register_memory_notifier(&kdump_mem_nb)) 759 return; 760 if (!crash_base) 761 crash_base = find_crash_base(crash_size, &msg); 762 if (!crash_base) { 763 pr_info("crashkernel reservation failed: %s\n", msg); 764 unregister_memory_notifier(&kdump_mem_nb); 765 return; 766 } 767 if (verify_crash_base(crash_base, crash_size, &msg)) { 768 pr_info("crashkernel reservation failed: %s\n", msg); 769 unregister_memory_notifier(&kdump_mem_nb); 770 return; 771 } 772 if (!OLDMEM_BASE && MACHINE_IS_VM) 773 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 774 crashk_res.start = crash_base; 775 crashk_res.end = crash_base + crash_size - 1; 776 insert_resource(&iomem_resource, &crashk_res); 777 reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK); 778 pr_info("Reserving %lluMB of memory at %lluMB " 779 "for crashkernel (System RAM: %luMB)\n", 780 crash_size >> 20, crash_base >> 20, memory_end >> 20); 781 os_info_crashkernel_add(crash_base, crash_size); 782 #endif 783 } 784 785 static void __init setup_memory(void) 786 { 787 unsigned long bootmap_size; 788 unsigned long start_pfn, end_pfn; 789 int i; 790 791 /* 792 * partially used pages are not usable - thus 793 * we are rounding upwards: 794 */ 795 start_pfn = PFN_UP(__pa(&_end)); 796 end_pfn = max_pfn = PFN_DOWN(memory_end); 797 798 #ifdef CONFIG_BLK_DEV_INITRD 799 /* 800 * Move the initrd in case the bitmap of the bootmem allocater 801 * would overwrite it. 802 */ 803 804 if (INITRD_START && INITRD_SIZE) { 805 unsigned long bmap_size; 806 unsigned long start; 807 808 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 809 bmap_size = PFN_PHYS(bmap_size); 810 811 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 812 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 813 814 #ifdef CONFIG_CRASH_DUMP 815 if (OLDMEM_BASE) { 816 /* Move initrd behind kdump oldmem */ 817 if (start + INITRD_SIZE > OLDMEM_BASE && 818 start < OLDMEM_BASE + OLDMEM_SIZE) 819 start = OLDMEM_BASE + OLDMEM_SIZE; 820 } 821 #endif 822 if (start + INITRD_SIZE > memory_end) { 823 pr_err("initrd extends beyond end of " 824 "memory (0x%08lx > 0x%08lx) " 825 "disabling initrd\n", 826 start + INITRD_SIZE, memory_end); 827 INITRD_START = INITRD_SIZE = 0; 828 } else { 829 pr_info("Moving initrd (0x%08lx -> " 830 "0x%08lx, size: %ld)\n", 831 INITRD_START, start, INITRD_SIZE); 832 memmove((void *) start, (void *) INITRD_START, 833 INITRD_SIZE); 834 INITRD_START = start; 835 } 836 } 837 } 838 #endif 839 840 /* 841 * Initialize the boot-time allocator 842 */ 843 bootmap_size = init_bootmem(start_pfn, end_pfn); 844 845 /* 846 * Register RAM areas with the bootmem allocator. 847 */ 848 849 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 850 unsigned long start_chunk, end_chunk, pfn; 851 852 if (memory_chunk[i].type != CHUNK_READ_WRITE && 853 memory_chunk[i].type != CHUNK_CRASHK) 854 continue; 855 start_chunk = PFN_DOWN(memory_chunk[i].addr); 856 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 857 end_chunk = min(end_chunk, end_pfn); 858 if (start_chunk >= end_chunk) 859 continue; 860 memblock_add_node(PFN_PHYS(start_chunk), 861 PFN_PHYS(end_chunk - start_chunk), 0); 862 pfn = max(start_chunk, start_pfn); 863 for (; pfn < end_chunk; pfn++) 864 page_set_storage_key(PFN_PHYS(pfn), 865 PAGE_DEFAULT_KEY, 0); 866 } 867 868 psw_set_key(PAGE_DEFAULT_KEY); 869 870 free_bootmem_with_active_regions(0, max_pfn); 871 872 /* 873 * Reserve memory used for lowcore/command line/kernel image. 874 */ 875 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 876 reserve_bootmem((unsigned long)_stext, 877 PFN_PHYS(start_pfn) - (unsigned long)_stext, 878 BOOTMEM_DEFAULT); 879 /* 880 * Reserve the bootmem bitmap itself as well. We do this in two 881 * steps (first step was init_bootmem()) because this catches 882 * the (very unlikely) case of us accidentally initializing the 883 * bootmem allocator with an invalid RAM area. 884 */ 885 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 886 BOOTMEM_DEFAULT); 887 888 #ifdef CONFIG_CRASH_DUMP 889 if (crashk_res.start) 890 reserve_bootmem(crashk_res.start, 891 crashk_res.end - crashk_res.start + 1, 892 BOOTMEM_DEFAULT); 893 if (is_kdump_kernel()) 894 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE, 895 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT); 896 #endif 897 #ifdef CONFIG_BLK_DEV_INITRD 898 if (INITRD_START && INITRD_SIZE) { 899 if (INITRD_START + INITRD_SIZE <= memory_end) { 900 reserve_bootmem(INITRD_START, INITRD_SIZE, 901 BOOTMEM_DEFAULT); 902 initrd_start = INITRD_START; 903 initrd_end = initrd_start + INITRD_SIZE; 904 } else { 905 pr_err("initrd extends beyond end of " 906 "memory (0x%08lx > 0x%08lx) " 907 "disabling initrd\n", 908 initrd_start + INITRD_SIZE, memory_end); 909 initrd_start = initrd_end = 0; 910 } 911 } 912 #endif 913 } 914 915 /* 916 * Setup hardware capabilities. 917 */ 918 static void __init setup_hwcaps(void) 919 { 920 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 921 struct cpuid cpu_id; 922 int i; 923 924 /* 925 * The store facility list bits numbers as found in the principles 926 * of operation are numbered with bit 1UL<<31 as number 0 to 927 * bit 1UL<<0 as number 31. 928 * Bit 0: instructions named N3, "backported" to esa-mode 929 * Bit 2: z/Architecture mode is active 930 * Bit 7: the store-facility-list-extended facility is installed 931 * Bit 17: the message-security assist is installed 932 * Bit 19: the long-displacement facility is installed 933 * Bit 21: the extended-immediate facility is installed 934 * Bit 22: extended-translation facility 3 is installed 935 * Bit 30: extended-translation facility 3 enhancement facility 936 * These get translated to: 937 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 938 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 939 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 940 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 941 */ 942 for (i = 0; i < 6; i++) 943 if (test_facility(stfl_bits[i])) 944 elf_hwcap |= 1UL << i; 945 946 if (test_facility(22) && test_facility(30)) 947 elf_hwcap |= HWCAP_S390_ETF3EH; 948 949 /* 950 * Check for additional facilities with store-facility-list-extended. 951 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 952 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 953 * as stored by stfl, bits 32-xxx contain additional facilities. 954 * How many facility words are stored depends on the number of 955 * doublewords passed to the instruction. The additional facilities 956 * are: 957 * Bit 42: decimal floating point facility is installed 958 * Bit 44: perform floating point operation facility is installed 959 * translated to: 960 * HWCAP_S390_DFP bit 6 (42 && 44). 961 */ 962 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 963 elf_hwcap |= HWCAP_S390_DFP; 964 965 /* 966 * Huge page support HWCAP_S390_HPAGE is bit 7. 967 */ 968 if (MACHINE_HAS_HPAGE) 969 elf_hwcap |= HWCAP_S390_HPAGE; 970 971 /* 972 * 64-bit register support for 31-bit processes 973 * HWCAP_S390_HIGH_GPRS is bit 9. 974 */ 975 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 976 977 get_cpu_id(&cpu_id); 978 switch (cpu_id.machine) { 979 case 0x9672: 980 #if !defined(CONFIG_64BIT) 981 default: /* Use "g5" as default for 31 bit kernels. */ 982 #endif 983 strcpy(elf_platform, "g5"); 984 break; 985 case 0x2064: 986 case 0x2066: 987 #if defined(CONFIG_64BIT) 988 default: /* Use "z900" as default for 64 bit kernels. */ 989 #endif 990 strcpy(elf_platform, "z900"); 991 break; 992 case 0x2084: 993 case 0x2086: 994 strcpy(elf_platform, "z990"); 995 break; 996 case 0x2094: 997 case 0x2096: 998 strcpy(elf_platform, "z9-109"); 999 break; 1000 case 0x2097: 1001 case 0x2098: 1002 strcpy(elf_platform, "z10"); 1003 break; 1004 case 0x2817: 1005 case 0x2818: 1006 strcpy(elf_platform, "z196"); 1007 break; 1008 } 1009 } 1010 1011 /* 1012 * Setup function called from init/main.c just after the banner 1013 * was printed. 1014 */ 1015 1016 void __init setup_arch(char **cmdline_p) 1017 { 1018 /* 1019 * print what head.S has found out about the machine 1020 */ 1021 #ifndef CONFIG_64BIT 1022 if (MACHINE_IS_VM) 1023 pr_info("Linux is running as a z/VM " 1024 "guest operating system in 31-bit mode\n"); 1025 else if (MACHINE_IS_LPAR) 1026 pr_info("Linux is running natively in 31-bit mode\n"); 1027 if (MACHINE_HAS_IEEE) 1028 pr_info("The hardware system has IEEE compatible " 1029 "floating point units\n"); 1030 else 1031 pr_info("The hardware system has no IEEE compatible " 1032 "floating point units\n"); 1033 #else /* CONFIG_64BIT */ 1034 if (MACHINE_IS_VM) 1035 pr_info("Linux is running as a z/VM " 1036 "guest operating system in 64-bit mode\n"); 1037 else if (MACHINE_IS_KVM) 1038 pr_info("Linux is running under KVM in 64-bit mode\n"); 1039 else if (MACHINE_IS_LPAR) 1040 pr_info("Linux is running natively in 64-bit mode\n"); 1041 #endif /* CONFIG_64BIT */ 1042 1043 /* Have one command line that is parsed and saved in /proc/cmdline */ 1044 /* boot_command_line has been already set up in early.c */ 1045 *cmdline_p = boot_command_line; 1046 1047 ROOT_DEV = Root_RAM0; 1048 1049 init_mm.start_code = PAGE_OFFSET; 1050 init_mm.end_code = (unsigned long) &_etext; 1051 init_mm.end_data = (unsigned long) &_edata; 1052 init_mm.brk = (unsigned long) &_end; 1053 1054 if (MACHINE_HAS_MVCOS) 1055 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 1056 else 1057 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 1058 1059 parse_early_param(); 1060 1061 os_info_init(); 1062 setup_ipl(); 1063 setup_memory_end(); 1064 setup_addressing_mode(); 1065 reserve_oldmem(); 1066 reserve_crashkernel(); 1067 setup_memory(); 1068 setup_resources(); 1069 setup_vmcoreinfo(); 1070 setup_lowcore(); 1071 1072 cpu_init(); 1073 s390_init_cpu_topology(); 1074 1075 /* 1076 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 1077 */ 1078 setup_hwcaps(); 1079 1080 /* 1081 * Create kernel page tables and switch to virtual addressing. 1082 */ 1083 paging_init(); 1084 1085 /* Setup default console */ 1086 conmode_default(); 1087 set_preferred_console(); 1088 1089 /* Setup zfcpdump support */ 1090 setup_zfcpdump(console_devno); 1091 } 1092