1 /* 2 * S390 version 3 * Copyright IBM Corp. 1999, 2012 4 * Author(s): Hartmut Penner (hp@de.ibm.com), 5 * Martin Schwidefsky (schwidefsky@de.ibm.com) 6 * 7 * Derived from "arch/i386/kernel/setup.c" 8 * Copyright (C) 1995, Linus Torvalds 9 */ 10 11 /* 12 * This file handles the architecture-dependent parts of initialization 13 */ 14 15 #define KMSG_COMPONENT "setup" 16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 17 18 #include <linux/errno.h> 19 #include <linux/export.h> 20 #include <linux/sched.h> 21 #include <linux/kernel.h> 22 #include <linux/memblock.h> 23 #include <linux/mm.h> 24 #include <linux/stddef.h> 25 #include <linux/unistd.h> 26 #include <linux/ptrace.h> 27 #include <linux/user.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/kernel_stat.h> 37 #include <linux/device.h> 38 #include <linux/notifier.h> 39 #include <linux/pfn.h> 40 #include <linux/ctype.h> 41 #include <linux/reboot.h> 42 #include <linux/topology.h> 43 #include <linux/ftrace.h> 44 #include <linux/kexec.h> 45 #include <linux/crash_dump.h> 46 #include <linux/memory.h> 47 #include <linux/compat.h> 48 49 #include <asm/ipl.h> 50 #include <asm/uaccess.h> 51 #include <asm/facility.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/kvm_virtio.h> 62 #include <asm/diag.h> 63 #include <asm/os_info.h> 64 #include <asm/sclp.h> 65 #include "entry.h" 66 67 /* 68 * User copy operations. 69 */ 70 struct uaccess_ops uaccess; 71 EXPORT_SYMBOL(uaccess); 72 73 /* 74 * Machine setup.. 75 */ 76 unsigned int console_mode = 0; 77 EXPORT_SYMBOL(console_mode); 78 79 unsigned int console_devno = -1; 80 EXPORT_SYMBOL(console_devno); 81 82 unsigned int console_irq = -1; 83 EXPORT_SYMBOL(console_irq); 84 85 unsigned long elf_hwcap = 0; 86 char elf_platform[ELF_PLATFORM_SIZE]; 87 88 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS]; 89 90 int __initdata memory_end_set; 91 unsigned long __initdata memory_end; 92 93 unsigned long VMALLOC_START; 94 EXPORT_SYMBOL(VMALLOC_START); 95 96 unsigned long VMALLOC_END; 97 EXPORT_SYMBOL(VMALLOC_END); 98 99 struct page *vmemmap; 100 EXPORT_SYMBOL(vmemmap); 101 102 #ifdef CONFIG_64BIT 103 unsigned long MODULES_VADDR; 104 unsigned long MODULES_END; 105 #endif 106 107 /* An array with a pointer to the lowcore of every CPU. */ 108 struct _lowcore *lowcore_ptr[NR_CPUS]; 109 EXPORT_SYMBOL(lowcore_ptr); 110 111 /* 112 * This is set up by the setup-routine at boot-time 113 * for S390 need to find out, what we have to setup 114 * using address 0x10400 ... 115 */ 116 117 #include <asm/setup.h> 118 119 /* 120 * condev= and conmode= setup parameter. 121 */ 122 123 static int __init condev_setup(char *str) 124 { 125 int vdev; 126 127 vdev = simple_strtoul(str, &str, 0); 128 if (vdev >= 0 && vdev < 65536) { 129 console_devno = vdev; 130 console_irq = -1; 131 } 132 return 1; 133 } 134 135 __setup("condev=", condev_setup); 136 137 static void __init set_preferred_console(void) 138 { 139 if (MACHINE_IS_KVM) { 140 if (sclp_has_vt220()) 141 add_preferred_console("ttyS", 1, NULL); 142 else if (sclp_has_linemode()) 143 add_preferred_console("ttyS", 0, NULL); 144 else 145 add_preferred_console("hvc", 0, NULL); 146 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 147 add_preferred_console("ttyS", 0, NULL); 148 else if (CONSOLE_IS_3270) 149 add_preferred_console("tty3270", 0, NULL); 150 } 151 152 static int __init conmode_setup(char *str) 153 { 154 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 155 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 156 SET_CONSOLE_SCLP; 157 #endif 158 #if defined(CONFIG_TN3215_CONSOLE) 159 if (strncmp(str, "3215", 5) == 0) 160 SET_CONSOLE_3215; 161 #endif 162 #if defined(CONFIG_TN3270_CONSOLE) 163 if (strncmp(str, "3270", 5) == 0) 164 SET_CONSOLE_3270; 165 #endif 166 set_preferred_console(); 167 return 1; 168 } 169 170 __setup("conmode=", conmode_setup); 171 172 static void __init conmode_default(void) 173 { 174 char query_buffer[1024]; 175 char *ptr; 176 177 if (MACHINE_IS_VM) { 178 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 179 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 180 ptr = strstr(query_buffer, "SUBCHANNEL ="); 181 console_irq = simple_strtoul(ptr + 13, NULL, 16); 182 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 183 ptr = strstr(query_buffer, "CONMODE"); 184 /* 185 * Set the conmode to 3215 so that the device recognition 186 * will set the cu_type of the console to 3215. If the 187 * conmode is 3270 and we don't set it back then both 188 * 3215 and the 3270 driver will try to access the console 189 * device (3215 as console and 3270 as normal tty). 190 */ 191 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 192 if (ptr == NULL) { 193 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 194 SET_CONSOLE_SCLP; 195 #endif 196 return; 197 } 198 if (strncmp(ptr + 8, "3270", 4) == 0) { 199 #if defined(CONFIG_TN3270_CONSOLE) 200 SET_CONSOLE_3270; 201 #elif defined(CONFIG_TN3215_CONSOLE) 202 SET_CONSOLE_3215; 203 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 204 SET_CONSOLE_SCLP; 205 #endif 206 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 207 #if defined(CONFIG_TN3215_CONSOLE) 208 SET_CONSOLE_3215; 209 #elif defined(CONFIG_TN3270_CONSOLE) 210 SET_CONSOLE_3270; 211 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 212 SET_CONSOLE_SCLP; 213 #endif 214 } 215 } else { 216 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 217 SET_CONSOLE_SCLP; 218 #endif 219 } 220 } 221 222 #ifdef CONFIG_ZFCPDUMP 223 static void __init setup_zfcpdump(void) 224 { 225 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 226 return; 227 if (OLDMEM_BASE) 228 return; 229 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 230 console_loglevel = 2; 231 } 232 #else 233 static inline void setup_zfcpdump(void) {} 234 #endif /* CONFIG_ZFCPDUMP */ 235 236 /* 237 * Reboot, halt and power_off stubs. They just call _machine_restart, 238 * _machine_halt or _machine_power_off. 239 */ 240 241 void machine_restart(char *command) 242 { 243 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 244 /* 245 * Only unblank the console if we are called in enabled 246 * context or a bust_spinlocks cleared the way for us. 247 */ 248 console_unblank(); 249 _machine_restart(command); 250 } 251 252 void machine_halt(void) 253 { 254 if (!in_interrupt() || oops_in_progress) 255 /* 256 * Only unblank the console if we are called in enabled 257 * context or a bust_spinlocks cleared the way for us. 258 */ 259 console_unblank(); 260 _machine_halt(); 261 } 262 263 void machine_power_off(void) 264 { 265 if (!in_interrupt() || oops_in_progress) 266 /* 267 * Only unblank the console if we are called in enabled 268 * context or a bust_spinlocks cleared the way for us. 269 */ 270 console_unblank(); 271 _machine_power_off(); 272 } 273 274 /* 275 * Dummy power off function. 276 */ 277 void (*pm_power_off)(void) = machine_power_off; 278 EXPORT_SYMBOL_GPL(pm_power_off); 279 280 static int __init early_parse_mem(char *p) 281 { 282 memory_end = memparse(p, &p); 283 memory_end_set = 1; 284 return 0; 285 } 286 early_param("mem", early_parse_mem); 287 288 static int __init parse_vmalloc(char *arg) 289 { 290 if (!arg) 291 return -EINVAL; 292 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 293 return 0; 294 } 295 early_param("vmalloc", parse_vmalloc); 296 297 static int __init early_parse_user_mode(char *p) 298 { 299 if (!p || strcmp(p, "primary") == 0) 300 return 0; 301 return 1; 302 } 303 early_param("user_mode", early_parse_user_mode); 304 305 void *restart_stack __attribute__((__section__(".data"))); 306 307 static void __init setup_lowcore(void) 308 { 309 struct _lowcore *lc; 310 311 /* 312 * Setup lowcore for boot cpu 313 */ 314 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); 315 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 316 lc->restart_psw.mask = PSW_KERNEL_BITS; 317 lc->restart_psw.addr = 318 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 319 lc->external_new_psw.mask = PSW_KERNEL_BITS | 320 PSW_MASK_DAT | PSW_MASK_MCHECK; 321 lc->external_new_psw.addr = 322 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 323 lc->svc_new_psw.mask = PSW_KERNEL_BITS | 324 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 325 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 326 lc->program_new_psw.mask = PSW_KERNEL_BITS | 327 PSW_MASK_DAT | PSW_MASK_MCHECK; 328 lc->program_new_psw.addr = 329 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler; 330 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 331 lc->mcck_new_psw.addr = 332 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 333 lc->io_new_psw.mask = PSW_KERNEL_BITS | 334 PSW_MASK_DAT | PSW_MASK_MCHECK; 335 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 336 lc->clock_comparator = -1ULL; 337 lc->kernel_stack = ((unsigned long) &init_thread_union) 338 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 339 lc->async_stack = (unsigned long) 340 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) 341 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 342 lc->panic_stack = (unsigned long) 343 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) 344 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 345 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 346 lc->thread_info = (unsigned long) &init_thread_union; 347 lc->machine_flags = S390_lowcore.machine_flags; 348 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 349 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 350 MAX_FACILITY_BIT/8); 351 #ifndef CONFIG_64BIT 352 if (MACHINE_HAS_IEEE) { 353 lc->extended_save_area_addr = (__u32) 354 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0); 355 /* enable extended save area */ 356 __ctl_set_bit(14, 29); 357 } 358 #else 359 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 360 #endif 361 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 362 lc->async_enter_timer = S390_lowcore.async_enter_timer; 363 lc->exit_timer = S390_lowcore.exit_timer; 364 lc->user_timer = S390_lowcore.user_timer; 365 lc->system_timer = S390_lowcore.system_timer; 366 lc->steal_timer = S390_lowcore.steal_timer; 367 lc->last_update_timer = S390_lowcore.last_update_timer; 368 lc->last_update_clock = S390_lowcore.last_update_clock; 369 lc->ftrace_func = S390_lowcore.ftrace_func; 370 371 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 372 restart_stack += ASYNC_SIZE; 373 374 /* 375 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 376 * restart data to the absolute zero lowcore. This is necesary if 377 * PSW restart is done on an offline CPU that has lowcore zero. 378 */ 379 lc->restart_stack = (unsigned long) restart_stack; 380 lc->restart_fn = (unsigned long) do_restart; 381 lc->restart_data = 0; 382 lc->restart_source = -1UL; 383 384 /* Setup absolute zero lowcore */ 385 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 386 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 387 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 388 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 389 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 390 391 set_prefix((u32)(unsigned long) lc); 392 lowcore_ptr[0] = lc; 393 } 394 395 static struct resource code_resource = { 396 .name = "Kernel code", 397 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 398 }; 399 400 static struct resource data_resource = { 401 .name = "Kernel data", 402 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 403 }; 404 405 static struct resource bss_resource = { 406 .name = "Kernel bss", 407 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 408 }; 409 410 static struct resource __initdata *standard_resources[] = { 411 &code_resource, 412 &data_resource, 413 &bss_resource, 414 }; 415 416 static void __init setup_resources(void) 417 { 418 struct resource *res, *std_res, *sub_res; 419 int i, j; 420 421 code_resource.start = (unsigned long) &_text; 422 code_resource.end = (unsigned long) &_etext - 1; 423 data_resource.start = (unsigned long) &_etext; 424 data_resource.end = (unsigned long) &_edata - 1; 425 bss_resource.start = (unsigned long) &__bss_start; 426 bss_resource.end = (unsigned long) &__bss_stop - 1; 427 428 for (i = 0; i < MEMORY_CHUNKS; i++) { 429 if (!memory_chunk[i].size) 430 continue; 431 res = alloc_bootmem_low(sizeof(*res)); 432 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 433 switch (memory_chunk[i].type) { 434 case CHUNK_READ_WRITE: 435 res->name = "System RAM"; 436 break; 437 case CHUNK_READ_ONLY: 438 res->name = "System ROM"; 439 res->flags |= IORESOURCE_READONLY; 440 break; 441 default: 442 res->name = "reserved"; 443 } 444 res->start = memory_chunk[i].addr; 445 res->end = res->start + memory_chunk[i].size - 1; 446 request_resource(&iomem_resource, res); 447 448 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 449 std_res = standard_resources[j]; 450 if (std_res->start < res->start || 451 std_res->start > res->end) 452 continue; 453 if (std_res->end > res->end) { 454 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 455 *sub_res = *std_res; 456 sub_res->end = res->end; 457 std_res->start = res->end + 1; 458 request_resource(res, sub_res); 459 } else { 460 request_resource(res, std_res); 461 } 462 } 463 } 464 } 465 466 static void __init setup_memory_end(void) 467 { 468 unsigned long vmax, vmalloc_size, tmp; 469 unsigned long real_memory_size = 0; 470 int i; 471 472 473 #ifdef CONFIG_ZFCPDUMP 474 if (ipl_info.type == IPL_TYPE_FCP_DUMP && 475 !OLDMEM_BASE && sclp_get_hsa_size()) { 476 memory_end = sclp_get_hsa_size(); 477 memory_end_set = 1; 478 } 479 #endif 480 memory_end &= PAGE_MASK; 481 482 /* 483 * Make sure all chunks are MAX_ORDER aligned so we don't need the 484 * extra checks that HOLES_IN_ZONE would require. 485 */ 486 for (i = 0; i < MEMORY_CHUNKS; i++) { 487 unsigned long start, end; 488 struct mem_chunk *chunk; 489 unsigned long align; 490 491 chunk = &memory_chunk[i]; 492 if (!chunk->size) 493 continue; 494 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 495 start = (chunk->addr + align - 1) & ~(align - 1); 496 end = (chunk->addr + chunk->size) & ~(align - 1); 497 if (start >= end) 498 memset(chunk, 0, sizeof(*chunk)); 499 else { 500 chunk->addr = start; 501 chunk->size = end - start; 502 } 503 real_memory_size = max(real_memory_size, 504 chunk->addr + chunk->size); 505 } 506 507 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 508 #ifdef CONFIG_64BIT 509 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 510 tmp = (memory_end ?: real_memory_size) / PAGE_SIZE; 511 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size; 512 if (tmp <= (1UL << 42)) 513 vmax = 1UL << 42; /* 3-level kernel page table */ 514 else 515 vmax = 1UL << 53; /* 4-level kernel page table */ 516 /* module area is at the end of the kernel address space. */ 517 MODULES_END = vmax; 518 MODULES_VADDR = MODULES_END - MODULES_LEN; 519 VMALLOC_END = MODULES_VADDR; 520 #else 521 vmalloc_size = VMALLOC_END ?: 96UL << 20; 522 vmax = 1UL << 31; /* 2-level kernel page table */ 523 /* vmalloc area is at the end of the kernel address space. */ 524 VMALLOC_END = vmax; 525 #endif 526 VMALLOC_START = vmax - vmalloc_size; 527 528 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 529 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 530 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 531 tmp = SECTION_ALIGN_UP(tmp); 532 tmp = VMALLOC_START - tmp * sizeof(struct page); 533 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 534 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 535 vmemmap = (struct page *) tmp; 536 537 /* Take care that memory_end is set and <= vmemmap */ 538 memory_end = min(memory_end ?: real_memory_size, tmp); 539 540 /* Fixup memory chunk array to fit into 0..memory_end */ 541 for (i = 0; i < MEMORY_CHUNKS; i++) { 542 struct mem_chunk *chunk = &memory_chunk[i]; 543 544 if (!chunk->size) 545 continue; 546 if (chunk->addr >= memory_end) { 547 memset(chunk, 0, sizeof(*chunk)); 548 continue; 549 } 550 if (chunk->addr + chunk->size > memory_end) 551 chunk->size = memory_end - chunk->addr; 552 } 553 } 554 555 static void __init setup_vmcoreinfo(void) 556 { 557 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 558 } 559 560 #ifdef CONFIG_CRASH_DUMP 561 562 /* 563 * Find suitable location for crashkernel memory 564 */ 565 static unsigned long __init find_crash_base(unsigned long crash_size, 566 char **msg) 567 { 568 unsigned long crash_base; 569 struct mem_chunk *chunk; 570 int i; 571 572 if (memory_chunk[0].size < crash_size) { 573 *msg = "first memory chunk must be at least crashkernel size"; 574 return 0; 575 } 576 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE) 577 return OLDMEM_BASE; 578 579 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) { 580 chunk = &memory_chunk[i]; 581 if (chunk->size == 0) 582 continue; 583 if (chunk->type != CHUNK_READ_WRITE) 584 continue; 585 if (chunk->size < crash_size) 586 continue; 587 crash_base = (chunk->addr + chunk->size) - crash_size; 588 if (crash_base < crash_size) 589 continue; 590 if (crash_base < sclp_get_hsa_size()) 591 continue; 592 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE) 593 continue; 594 return crash_base; 595 } 596 *msg = "no suitable area found"; 597 return 0; 598 } 599 600 /* 601 * Check if crash_base and crash_size is valid 602 */ 603 static int __init verify_crash_base(unsigned long crash_base, 604 unsigned long crash_size, 605 char **msg) 606 { 607 struct mem_chunk *chunk; 608 int i; 609 610 /* 611 * Because we do the swap to zero, we must have at least 'crash_size' 612 * bytes free space before crash_base 613 */ 614 if (crash_size > crash_base) { 615 *msg = "crashkernel offset must be greater than size"; 616 return -EINVAL; 617 } 618 619 /* First memory chunk must be at least crash_size */ 620 if (memory_chunk[0].size < crash_size) { 621 *msg = "first memory chunk must be at least crashkernel size"; 622 return -EINVAL; 623 } 624 /* Check if we fit into the respective memory chunk */ 625 for (i = 0; i < MEMORY_CHUNKS; i++) { 626 chunk = &memory_chunk[i]; 627 if (chunk->size == 0) 628 continue; 629 if (crash_base < chunk->addr) 630 continue; 631 if (crash_base >= chunk->addr + chunk->size) 632 continue; 633 /* we have found the memory chunk */ 634 if (crash_base + crash_size > chunk->addr + chunk->size) { 635 *msg = "selected memory chunk is too small for " 636 "crashkernel memory"; 637 return -EINVAL; 638 } 639 return 0; 640 } 641 *msg = "invalid memory range specified"; 642 return -EINVAL; 643 } 644 645 /* 646 * When kdump is enabled, we have to ensure that no memory from 647 * the area [0 - crashkernel memory size] and 648 * [crashk_res.start - crashk_res.end] is set offline. 649 */ 650 static int kdump_mem_notifier(struct notifier_block *nb, 651 unsigned long action, void *data) 652 { 653 struct memory_notify *arg = data; 654 655 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 656 return NOTIFY_BAD; 657 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 658 return NOTIFY_OK; 659 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 660 return NOTIFY_OK; 661 return NOTIFY_BAD; 662 } 663 664 static struct notifier_block kdump_mem_nb = { 665 .notifier_call = kdump_mem_notifier, 666 }; 667 668 #endif 669 670 /* 671 * Make sure that oldmem, where the dump is stored, is protected 672 */ 673 static void reserve_oldmem(void) 674 { 675 #ifdef CONFIG_CRASH_DUMP 676 unsigned long real_size = 0; 677 int i; 678 679 if (!OLDMEM_BASE) 680 return; 681 for (i = 0; i < MEMORY_CHUNKS; i++) { 682 struct mem_chunk *chunk = &memory_chunk[i]; 683 684 real_size = max(real_size, chunk->addr + chunk->size); 685 } 686 create_mem_hole(memory_chunk, OLDMEM_BASE, OLDMEM_SIZE); 687 create_mem_hole(memory_chunk, OLDMEM_SIZE, real_size - OLDMEM_SIZE); 688 #endif 689 } 690 691 /* 692 * Reserve memory for kdump kernel to be loaded with kexec 693 */ 694 static void __init reserve_crashkernel(void) 695 { 696 #ifdef CONFIG_CRASH_DUMP 697 unsigned long long crash_base, crash_size; 698 char *msg = NULL; 699 int rc; 700 701 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 702 &crash_base); 703 if (rc || crash_size == 0) 704 return; 705 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 706 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 707 if (register_memory_notifier(&kdump_mem_nb)) 708 return; 709 if (!crash_base) 710 crash_base = find_crash_base(crash_size, &msg); 711 if (!crash_base) { 712 pr_info("crashkernel reservation failed: %s\n", msg); 713 unregister_memory_notifier(&kdump_mem_nb); 714 return; 715 } 716 if (verify_crash_base(crash_base, crash_size, &msg)) { 717 pr_info("crashkernel reservation failed: %s\n", msg); 718 unregister_memory_notifier(&kdump_mem_nb); 719 return; 720 } 721 if (!OLDMEM_BASE && MACHINE_IS_VM) 722 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 723 crashk_res.start = crash_base; 724 crashk_res.end = crash_base + crash_size - 1; 725 insert_resource(&iomem_resource, &crashk_res); 726 create_mem_hole(memory_chunk, crash_base, crash_size); 727 pr_info("Reserving %lluMB of memory at %lluMB " 728 "for crashkernel (System RAM: %luMB)\n", 729 crash_size >> 20, crash_base >> 20, memory_end >> 20); 730 os_info_crashkernel_add(crash_base, crash_size); 731 #endif 732 } 733 734 static void __init setup_memory(void) 735 { 736 unsigned long bootmap_size; 737 unsigned long start_pfn, end_pfn; 738 int i; 739 740 /* 741 * partially used pages are not usable - thus 742 * we are rounding upwards: 743 */ 744 start_pfn = PFN_UP(__pa(&_end)); 745 end_pfn = max_pfn = PFN_DOWN(memory_end); 746 747 #ifdef CONFIG_BLK_DEV_INITRD 748 /* 749 * Move the initrd in case the bitmap of the bootmem allocater 750 * would overwrite it. 751 */ 752 753 if (INITRD_START && INITRD_SIZE) { 754 unsigned long bmap_size; 755 unsigned long start; 756 757 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 758 bmap_size = PFN_PHYS(bmap_size); 759 760 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 761 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 762 763 #ifdef CONFIG_CRASH_DUMP 764 if (OLDMEM_BASE) { 765 /* Move initrd behind kdump oldmem */ 766 if (start + INITRD_SIZE > OLDMEM_BASE && 767 start < OLDMEM_BASE + OLDMEM_SIZE) 768 start = OLDMEM_BASE + OLDMEM_SIZE; 769 } 770 #endif 771 if (start + INITRD_SIZE > memory_end) { 772 pr_err("initrd extends beyond end of " 773 "memory (0x%08lx > 0x%08lx) " 774 "disabling initrd\n", 775 start + INITRD_SIZE, memory_end); 776 INITRD_START = INITRD_SIZE = 0; 777 } else { 778 pr_info("Moving initrd (0x%08lx -> " 779 "0x%08lx, size: %ld)\n", 780 INITRD_START, start, INITRD_SIZE); 781 memmove((void *) start, (void *) INITRD_START, 782 INITRD_SIZE); 783 INITRD_START = start; 784 } 785 } 786 } 787 #endif 788 789 /* 790 * Initialize the boot-time allocator 791 */ 792 bootmap_size = init_bootmem(start_pfn, end_pfn); 793 794 /* 795 * Register RAM areas with the bootmem allocator. 796 */ 797 798 for (i = 0; i < MEMORY_CHUNKS; i++) { 799 unsigned long start_chunk, end_chunk, pfn; 800 801 if (!memory_chunk[i].size) 802 continue; 803 start_chunk = PFN_DOWN(memory_chunk[i].addr); 804 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 805 end_chunk = min(end_chunk, end_pfn); 806 if (start_chunk >= end_chunk) 807 continue; 808 memblock_add_node(PFN_PHYS(start_chunk), 809 PFN_PHYS(end_chunk - start_chunk), 0); 810 pfn = max(start_chunk, start_pfn); 811 storage_key_init_range(PFN_PHYS(pfn), PFN_PHYS(end_chunk)); 812 } 813 814 psw_set_key(PAGE_DEFAULT_KEY); 815 816 free_bootmem_with_active_regions(0, max_pfn); 817 818 /* 819 * Reserve memory used for lowcore/command line/kernel image. 820 */ 821 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 822 reserve_bootmem((unsigned long)_stext, 823 PFN_PHYS(start_pfn) - (unsigned long)_stext, 824 BOOTMEM_DEFAULT); 825 /* 826 * Reserve the bootmem bitmap itself as well. We do this in two 827 * steps (first step was init_bootmem()) because this catches 828 * the (very unlikely) case of us accidentally initializing the 829 * bootmem allocator with an invalid RAM area. 830 */ 831 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 832 BOOTMEM_DEFAULT); 833 834 #ifdef CONFIG_CRASH_DUMP 835 if (crashk_res.start) 836 reserve_bootmem(crashk_res.start, 837 crashk_res.end - crashk_res.start + 1, 838 BOOTMEM_DEFAULT); 839 if (is_kdump_kernel()) 840 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE, 841 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT); 842 #endif 843 #ifdef CONFIG_BLK_DEV_INITRD 844 if (INITRD_START && INITRD_SIZE) { 845 if (INITRD_START + INITRD_SIZE <= memory_end) { 846 reserve_bootmem(INITRD_START, INITRD_SIZE, 847 BOOTMEM_DEFAULT); 848 initrd_start = INITRD_START; 849 initrd_end = initrd_start + INITRD_SIZE; 850 } else { 851 pr_err("initrd extends beyond end of " 852 "memory (0x%08lx > 0x%08lx) " 853 "disabling initrd\n", 854 initrd_start + INITRD_SIZE, memory_end); 855 initrd_start = initrd_end = 0; 856 } 857 } 858 #endif 859 } 860 861 /* 862 * Setup hardware capabilities. 863 */ 864 static void __init setup_hwcaps(void) 865 { 866 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 867 struct cpuid cpu_id; 868 int i; 869 870 /* 871 * The store facility list bits numbers as found in the principles 872 * of operation are numbered with bit 1UL<<31 as number 0 to 873 * bit 1UL<<0 as number 31. 874 * Bit 0: instructions named N3, "backported" to esa-mode 875 * Bit 2: z/Architecture mode is active 876 * Bit 7: the store-facility-list-extended facility is installed 877 * Bit 17: the message-security assist is installed 878 * Bit 19: the long-displacement facility is installed 879 * Bit 21: the extended-immediate facility is installed 880 * Bit 22: extended-translation facility 3 is installed 881 * Bit 30: extended-translation facility 3 enhancement facility 882 * These get translated to: 883 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 884 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 885 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 886 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 887 */ 888 for (i = 0; i < 6; i++) 889 if (test_facility(stfl_bits[i])) 890 elf_hwcap |= 1UL << i; 891 892 if (test_facility(22) && test_facility(30)) 893 elf_hwcap |= HWCAP_S390_ETF3EH; 894 895 /* 896 * Check for additional facilities with store-facility-list-extended. 897 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 898 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 899 * as stored by stfl, bits 32-xxx contain additional facilities. 900 * How many facility words are stored depends on the number of 901 * doublewords passed to the instruction. The additional facilities 902 * are: 903 * Bit 42: decimal floating point facility is installed 904 * Bit 44: perform floating point operation facility is installed 905 * translated to: 906 * HWCAP_S390_DFP bit 6 (42 && 44). 907 */ 908 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 909 elf_hwcap |= HWCAP_S390_DFP; 910 911 /* 912 * Huge page support HWCAP_S390_HPAGE is bit 7. 913 */ 914 if (MACHINE_HAS_HPAGE) 915 elf_hwcap |= HWCAP_S390_HPAGE; 916 917 #if defined(CONFIG_64BIT) 918 /* 919 * 64-bit register support for 31-bit processes 920 * HWCAP_S390_HIGH_GPRS is bit 9. 921 */ 922 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 923 924 /* 925 * Transactional execution support HWCAP_S390_TE is bit 10. 926 */ 927 if (test_facility(50) && test_facility(73)) 928 elf_hwcap |= HWCAP_S390_TE; 929 #endif 930 931 get_cpu_id(&cpu_id); 932 switch (cpu_id.machine) { 933 case 0x9672: 934 #if !defined(CONFIG_64BIT) 935 default: /* Use "g5" as default for 31 bit kernels. */ 936 #endif 937 strcpy(elf_platform, "g5"); 938 break; 939 case 0x2064: 940 case 0x2066: 941 #if defined(CONFIG_64BIT) 942 default: /* Use "z900" as default for 64 bit kernels. */ 943 #endif 944 strcpy(elf_platform, "z900"); 945 break; 946 case 0x2084: 947 case 0x2086: 948 strcpy(elf_platform, "z990"); 949 break; 950 case 0x2094: 951 case 0x2096: 952 strcpy(elf_platform, "z9-109"); 953 break; 954 case 0x2097: 955 case 0x2098: 956 strcpy(elf_platform, "z10"); 957 break; 958 case 0x2817: 959 case 0x2818: 960 strcpy(elf_platform, "z196"); 961 break; 962 case 0x2827: 963 case 0x2828: 964 strcpy(elf_platform, "zEC12"); 965 break; 966 } 967 } 968 969 /* 970 * Setup function called from init/main.c just after the banner 971 * was printed. 972 */ 973 974 void __init setup_arch(char **cmdline_p) 975 { 976 /* 977 * print what head.S has found out about the machine 978 */ 979 #ifndef CONFIG_64BIT 980 if (MACHINE_IS_VM) 981 pr_info("Linux is running as a z/VM " 982 "guest operating system in 31-bit mode\n"); 983 else if (MACHINE_IS_LPAR) 984 pr_info("Linux is running natively in 31-bit mode\n"); 985 if (MACHINE_HAS_IEEE) 986 pr_info("The hardware system has IEEE compatible " 987 "floating point units\n"); 988 else 989 pr_info("The hardware system has no IEEE compatible " 990 "floating point units\n"); 991 #else /* CONFIG_64BIT */ 992 if (MACHINE_IS_VM) 993 pr_info("Linux is running as a z/VM " 994 "guest operating system in 64-bit mode\n"); 995 else if (MACHINE_IS_KVM) 996 pr_info("Linux is running under KVM in 64-bit mode\n"); 997 else if (MACHINE_IS_LPAR) 998 pr_info("Linux is running natively in 64-bit mode\n"); 999 #endif /* CONFIG_64BIT */ 1000 1001 /* Have one command line that is parsed and saved in /proc/cmdline */ 1002 /* boot_command_line has been already set up in early.c */ 1003 *cmdline_p = boot_command_line; 1004 1005 ROOT_DEV = Root_RAM0; 1006 1007 init_mm.start_code = PAGE_OFFSET; 1008 init_mm.end_code = (unsigned long) &_etext; 1009 init_mm.end_data = (unsigned long) &_edata; 1010 init_mm.brk = (unsigned long) &_end; 1011 1012 uaccess = MACHINE_HAS_MVCOS ? uaccess_mvcos : uaccess_pt; 1013 1014 parse_early_param(); 1015 detect_memory_layout(memory_chunk, memory_end); 1016 os_info_init(); 1017 setup_ipl(); 1018 reserve_oldmem(); 1019 setup_memory_end(); 1020 reserve_crashkernel(); 1021 setup_memory(); 1022 setup_resources(); 1023 setup_vmcoreinfo(); 1024 setup_lowcore(); 1025 1026 smp_fill_possible_mask(); 1027 cpu_init(); 1028 s390_init_cpu_topology(); 1029 1030 /* 1031 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 1032 */ 1033 setup_hwcaps(); 1034 1035 /* 1036 * Create kernel page tables and switch to virtual addressing. 1037 */ 1038 paging_init(); 1039 1040 /* Setup default console */ 1041 conmode_default(); 1042 set_preferred_console(); 1043 1044 /* Setup zfcpdump support */ 1045 setup_zfcpdump(); 1046 } 1047