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 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 #ifdef CONFIG_64BIT 109 unsigned long MODULES_VADDR; 110 unsigned long MODULES_END; 111 #endif 112 113 /* An array with a pointer to the lowcore of every CPU. */ 114 struct _lowcore *lowcore_ptr[NR_CPUS]; 115 EXPORT_SYMBOL(lowcore_ptr); 116 117 /* 118 * This is set up by the setup-routine at boot-time 119 * for S390 need to find out, what we have to setup 120 * using address 0x10400 ... 121 */ 122 123 #include <asm/setup.h> 124 125 /* 126 * condev= and conmode= setup parameter. 127 */ 128 129 static int __init condev_setup(char *str) 130 { 131 int vdev; 132 133 vdev = simple_strtoul(str, &str, 0); 134 if (vdev >= 0 && vdev < 65536) { 135 console_devno = vdev; 136 console_irq = -1; 137 } 138 return 1; 139 } 140 141 __setup("condev=", condev_setup); 142 143 static void __init set_preferred_console(void) 144 { 145 if (MACHINE_IS_KVM) { 146 if (sclp_has_vt220()) 147 add_preferred_console("ttyS", 1, NULL); 148 else if (sclp_has_linemode()) 149 add_preferred_console("ttyS", 0, NULL); 150 else 151 add_preferred_console("hvc", 0, NULL); 152 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 153 add_preferred_console("ttyS", 0, NULL); 154 else if (CONSOLE_IS_3270) 155 add_preferred_console("tty3270", 0, NULL); 156 } 157 158 static int __init conmode_setup(char *str) 159 { 160 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 161 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 162 SET_CONSOLE_SCLP; 163 #endif 164 #if defined(CONFIG_TN3215_CONSOLE) 165 if (strncmp(str, "3215", 5) == 0) 166 SET_CONSOLE_3215; 167 #endif 168 #if defined(CONFIG_TN3270_CONSOLE) 169 if (strncmp(str, "3270", 5) == 0) 170 SET_CONSOLE_3270; 171 #endif 172 set_preferred_console(); 173 return 1; 174 } 175 176 __setup("conmode=", conmode_setup); 177 178 static void __init conmode_default(void) 179 { 180 char query_buffer[1024]; 181 char *ptr; 182 183 if (MACHINE_IS_VM) { 184 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 185 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 186 ptr = strstr(query_buffer, "SUBCHANNEL ="); 187 console_irq = simple_strtoul(ptr + 13, NULL, 16); 188 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 189 ptr = strstr(query_buffer, "CONMODE"); 190 /* 191 * Set the conmode to 3215 so that the device recognition 192 * will set the cu_type of the console to 3215. If the 193 * conmode is 3270 and we don't set it back then both 194 * 3215 and the 3270 driver will try to access the console 195 * device (3215 as console and 3270 as normal tty). 196 */ 197 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 198 if (ptr == NULL) { 199 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 200 SET_CONSOLE_SCLP; 201 #endif 202 return; 203 } 204 if (strncmp(ptr + 8, "3270", 4) == 0) { 205 #if defined(CONFIG_TN3270_CONSOLE) 206 SET_CONSOLE_3270; 207 #elif defined(CONFIG_TN3215_CONSOLE) 208 SET_CONSOLE_3215; 209 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 210 SET_CONSOLE_SCLP; 211 #endif 212 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 213 #if defined(CONFIG_TN3215_CONSOLE) 214 SET_CONSOLE_3215; 215 #elif defined(CONFIG_TN3270_CONSOLE) 216 SET_CONSOLE_3270; 217 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 218 SET_CONSOLE_SCLP; 219 #endif 220 } 221 } else { 222 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 223 SET_CONSOLE_SCLP; 224 #endif 225 } 226 } 227 228 #ifdef CONFIG_ZFCPDUMP 229 static void __init setup_zfcpdump(void) 230 { 231 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 232 return; 233 if (OLDMEM_BASE) 234 return; 235 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 236 console_loglevel = 2; 237 } 238 #else 239 static inline void setup_zfcpdump(void) {} 240 #endif /* CONFIG_ZFCPDUMP */ 241 242 /* 243 * Reboot, halt and power_off stubs. They just call _machine_restart, 244 * _machine_halt or _machine_power_off. 245 */ 246 247 void machine_restart(char *command) 248 { 249 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 250 /* 251 * Only unblank the console if we are called in enabled 252 * context or a bust_spinlocks cleared the way for us. 253 */ 254 console_unblank(); 255 _machine_restart(command); 256 } 257 258 void machine_halt(void) 259 { 260 if (!in_interrupt() || oops_in_progress) 261 /* 262 * Only unblank the console if we are called in enabled 263 * context or a bust_spinlocks cleared the way for us. 264 */ 265 console_unblank(); 266 _machine_halt(); 267 } 268 269 void machine_power_off(void) 270 { 271 if (!in_interrupt() || oops_in_progress) 272 /* 273 * Only unblank the console if we are called in enabled 274 * context or a bust_spinlocks cleared the way for us. 275 */ 276 console_unblank(); 277 _machine_power_off(); 278 } 279 280 /* 281 * Dummy power off function. 282 */ 283 void (*pm_power_off)(void) = machine_power_off; 284 EXPORT_SYMBOL_GPL(pm_power_off); 285 286 static int __init early_parse_mem(char *p) 287 { 288 memory_end = memparse(p, &p); 289 memory_end_set = 1; 290 return 0; 291 } 292 early_param("mem", early_parse_mem); 293 294 static int __init parse_vmalloc(char *arg) 295 { 296 if (!arg) 297 return -EINVAL; 298 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 299 return 0; 300 } 301 early_param("vmalloc", parse_vmalloc); 302 303 unsigned int s390_user_mode = PRIMARY_SPACE_MODE; 304 EXPORT_SYMBOL_GPL(s390_user_mode); 305 306 static void __init set_user_mode_primary(void) 307 { 308 psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME; 309 psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY; 310 #ifdef CONFIG_COMPAT 311 psw32_user_bits = 312 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY; 313 #endif 314 uaccess = MACHINE_HAS_MVCOS ? uaccess_mvcos_switch : uaccess_pt; 315 } 316 317 static int __init early_parse_user_mode(char *p) 318 { 319 if (p && strcmp(p, "primary") == 0) 320 s390_user_mode = PRIMARY_SPACE_MODE; 321 else if (!p || strcmp(p, "home") == 0) 322 s390_user_mode = HOME_SPACE_MODE; 323 else 324 return 1; 325 return 0; 326 } 327 early_param("user_mode", early_parse_user_mode); 328 329 static void __init setup_addressing_mode(void) 330 { 331 if (s390_user_mode != PRIMARY_SPACE_MODE) 332 return; 333 set_user_mode_primary(); 334 if (MACHINE_HAS_MVCOS) 335 pr_info("Address spaces switched, mvcos available\n"); 336 else 337 pr_info("Address spaces switched, mvcos not available\n"); 338 } 339 340 void *restart_stack __attribute__((__section__(".data"))); 341 342 static void __init setup_lowcore(void) 343 { 344 struct _lowcore *lc; 345 346 /* 347 * Setup lowcore for boot cpu 348 */ 349 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); 350 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 351 lc->restart_psw.mask = psw_kernel_bits; 352 lc->restart_psw.addr = 353 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 354 lc->external_new_psw.mask = psw_kernel_bits | 355 PSW_MASK_DAT | PSW_MASK_MCHECK; 356 lc->external_new_psw.addr = 357 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 358 lc->svc_new_psw.mask = psw_kernel_bits | 359 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 360 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 361 lc->program_new_psw.mask = psw_kernel_bits | 362 PSW_MASK_DAT | PSW_MASK_MCHECK; 363 lc->program_new_psw.addr = 364 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler; 365 lc->mcck_new_psw.mask = psw_kernel_bits; 366 lc->mcck_new_psw.addr = 367 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 368 lc->io_new_psw.mask = psw_kernel_bits | 369 PSW_MASK_DAT | PSW_MASK_MCHECK; 370 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 371 lc->clock_comparator = -1ULL; 372 lc->kernel_stack = ((unsigned long) &init_thread_union) 373 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 374 lc->async_stack = (unsigned long) 375 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) 376 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 377 lc->panic_stack = (unsigned long) 378 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) 379 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 380 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 381 lc->thread_info = (unsigned long) &init_thread_union; 382 lc->machine_flags = S390_lowcore.machine_flags; 383 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 384 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 385 MAX_FACILITY_BIT/8); 386 #ifndef CONFIG_64BIT 387 if (MACHINE_HAS_IEEE) { 388 lc->extended_save_area_addr = (__u32) 389 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0); 390 /* enable extended save area */ 391 __ctl_set_bit(14, 29); 392 } 393 #else 394 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 395 #endif 396 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 397 lc->async_enter_timer = S390_lowcore.async_enter_timer; 398 lc->exit_timer = S390_lowcore.exit_timer; 399 lc->user_timer = S390_lowcore.user_timer; 400 lc->system_timer = S390_lowcore.system_timer; 401 lc->steal_timer = S390_lowcore.steal_timer; 402 lc->last_update_timer = S390_lowcore.last_update_timer; 403 lc->last_update_clock = S390_lowcore.last_update_clock; 404 lc->ftrace_func = S390_lowcore.ftrace_func; 405 406 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 407 restart_stack += ASYNC_SIZE; 408 409 /* 410 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 411 * restart data to the absolute zero lowcore. This is necesary if 412 * PSW restart is done on an offline CPU that has lowcore zero. 413 */ 414 lc->restart_stack = (unsigned long) restart_stack; 415 lc->restart_fn = (unsigned long) do_restart; 416 lc->restart_data = 0; 417 lc->restart_source = -1UL; 418 419 /* Setup absolute zero lowcore */ 420 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 421 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 422 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 423 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 424 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 425 426 set_prefix((u32)(unsigned long) lc); 427 lowcore_ptr[0] = lc; 428 } 429 430 static struct resource code_resource = { 431 .name = "Kernel code", 432 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 433 }; 434 435 static struct resource data_resource = { 436 .name = "Kernel data", 437 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 438 }; 439 440 static struct resource bss_resource = { 441 .name = "Kernel bss", 442 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 443 }; 444 445 static struct resource __initdata *standard_resources[] = { 446 &code_resource, 447 &data_resource, 448 &bss_resource, 449 }; 450 451 static void __init setup_resources(void) 452 { 453 struct resource *res, *std_res, *sub_res; 454 int i, j; 455 456 code_resource.start = (unsigned long) &_text; 457 code_resource.end = (unsigned long) &_etext - 1; 458 data_resource.start = (unsigned long) &_etext; 459 data_resource.end = (unsigned long) &_edata - 1; 460 bss_resource.start = (unsigned long) &__bss_start; 461 bss_resource.end = (unsigned long) &__bss_stop - 1; 462 463 for (i = 0; i < MEMORY_CHUNKS; i++) { 464 if (!memory_chunk[i].size) 465 continue; 466 res = alloc_bootmem_low(sizeof(*res)); 467 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 468 switch (memory_chunk[i].type) { 469 case CHUNK_READ_WRITE: 470 res->name = "System RAM"; 471 break; 472 case CHUNK_READ_ONLY: 473 res->name = "System ROM"; 474 res->flags |= IORESOURCE_READONLY; 475 break; 476 default: 477 res->name = "reserved"; 478 } 479 res->start = memory_chunk[i].addr; 480 res->end = res->start + memory_chunk[i].size - 1; 481 request_resource(&iomem_resource, res); 482 483 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 484 std_res = standard_resources[j]; 485 if (std_res->start < res->start || 486 std_res->start > res->end) 487 continue; 488 if (std_res->end > res->end) { 489 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 490 *sub_res = *std_res; 491 sub_res->end = res->end; 492 std_res->start = res->end + 1; 493 request_resource(res, sub_res); 494 } else { 495 request_resource(res, std_res); 496 } 497 } 498 } 499 } 500 501 static void __init setup_memory_end(void) 502 { 503 unsigned long vmax, vmalloc_size, tmp; 504 unsigned long real_memory_size = 0; 505 int i; 506 507 508 #ifdef CONFIG_ZFCPDUMP 509 if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) { 510 memory_end = ZFCPDUMP_HSA_SIZE; 511 memory_end_set = 1; 512 } 513 #endif 514 memory_end &= PAGE_MASK; 515 516 /* 517 * Make sure all chunks are MAX_ORDER aligned so we don't need the 518 * extra checks that HOLES_IN_ZONE would require. 519 */ 520 for (i = 0; i < MEMORY_CHUNKS; i++) { 521 unsigned long start, end; 522 struct mem_chunk *chunk; 523 unsigned long align; 524 525 chunk = &memory_chunk[i]; 526 if (!chunk->size) 527 continue; 528 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 529 start = (chunk->addr + align - 1) & ~(align - 1); 530 end = (chunk->addr + chunk->size) & ~(align - 1); 531 if (start >= end) 532 memset(chunk, 0, sizeof(*chunk)); 533 else { 534 chunk->addr = start; 535 chunk->size = end - start; 536 } 537 real_memory_size = max(real_memory_size, 538 chunk->addr + chunk->size); 539 } 540 541 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 542 #ifdef CONFIG_64BIT 543 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 544 tmp = (memory_end ?: real_memory_size) / PAGE_SIZE; 545 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size; 546 if (tmp <= (1UL << 42)) 547 vmax = 1UL << 42; /* 3-level kernel page table */ 548 else 549 vmax = 1UL << 53; /* 4-level kernel page table */ 550 /* module area is at the end of the kernel address space. */ 551 MODULES_END = vmax; 552 MODULES_VADDR = MODULES_END - MODULES_LEN; 553 VMALLOC_END = MODULES_VADDR; 554 #else 555 vmalloc_size = VMALLOC_END ?: 96UL << 20; 556 vmax = 1UL << 31; /* 2-level kernel page table */ 557 /* vmalloc area is at the end of the kernel address space. */ 558 VMALLOC_END = vmax; 559 #endif 560 VMALLOC_START = vmax - vmalloc_size; 561 562 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 563 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 564 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 565 tmp = SECTION_ALIGN_UP(tmp); 566 tmp = VMALLOC_START - tmp * sizeof(struct page); 567 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 568 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 569 vmemmap = (struct page *) tmp; 570 571 /* Take care that memory_end is set and <= vmemmap */ 572 memory_end = min(memory_end ?: real_memory_size, tmp); 573 574 /* Fixup memory chunk array to fit into 0..memory_end */ 575 for (i = 0; i < MEMORY_CHUNKS; i++) { 576 struct mem_chunk *chunk = &memory_chunk[i]; 577 578 if (!chunk->size) 579 continue; 580 if (chunk->addr >= memory_end) { 581 memset(chunk, 0, sizeof(*chunk)); 582 continue; 583 } 584 if (chunk->addr + chunk->size > memory_end) 585 chunk->size = memory_end - chunk->addr; 586 } 587 } 588 589 static void __init setup_vmcoreinfo(void) 590 { 591 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 592 } 593 594 #ifdef CONFIG_CRASH_DUMP 595 596 /* 597 * Find suitable location for crashkernel memory 598 */ 599 static unsigned long __init find_crash_base(unsigned long crash_size, 600 char **msg) 601 { 602 unsigned long crash_base; 603 struct mem_chunk *chunk; 604 int i; 605 606 if (memory_chunk[0].size < crash_size) { 607 *msg = "first memory chunk must be at least crashkernel size"; 608 return 0; 609 } 610 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE) 611 return OLDMEM_BASE; 612 613 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) { 614 chunk = &memory_chunk[i]; 615 if (chunk->size == 0) 616 continue; 617 if (chunk->type != CHUNK_READ_WRITE) 618 continue; 619 if (chunk->size < crash_size) 620 continue; 621 crash_base = (chunk->addr + chunk->size) - crash_size; 622 if (crash_base < crash_size) 623 continue; 624 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX) 625 continue; 626 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE) 627 continue; 628 return crash_base; 629 } 630 *msg = "no suitable area found"; 631 return 0; 632 } 633 634 /* 635 * Check if crash_base and crash_size is valid 636 */ 637 static int __init verify_crash_base(unsigned long crash_base, 638 unsigned long crash_size, 639 char **msg) 640 { 641 struct mem_chunk *chunk; 642 int i; 643 644 /* 645 * Because we do the swap to zero, we must have at least 'crash_size' 646 * bytes free space before crash_base 647 */ 648 if (crash_size > crash_base) { 649 *msg = "crashkernel offset must be greater than size"; 650 return -EINVAL; 651 } 652 653 /* First memory chunk must be at least crash_size */ 654 if (memory_chunk[0].size < crash_size) { 655 *msg = "first memory chunk must be at least crashkernel size"; 656 return -EINVAL; 657 } 658 /* Check if we fit into the respective memory chunk */ 659 for (i = 0; i < MEMORY_CHUNKS; i++) { 660 chunk = &memory_chunk[i]; 661 if (chunk->size == 0) 662 continue; 663 if (crash_base < chunk->addr) 664 continue; 665 if (crash_base >= chunk->addr + chunk->size) 666 continue; 667 /* we have found the memory chunk */ 668 if (crash_base + crash_size > chunk->addr + chunk->size) { 669 *msg = "selected memory chunk is too small for " 670 "crashkernel memory"; 671 return -EINVAL; 672 } 673 return 0; 674 } 675 *msg = "invalid memory range specified"; 676 return -EINVAL; 677 } 678 679 /* 680 * When kdump is enabled, we have to ensure that no memory from 681 * the area [0 - crashkernel memory size] and 682 * [crashk_res.start - crashk_res.end] is set offline. 683 */ 684 static int kdump_mem_notifier(struct notifier_block *nb, 685 unsigned long action, void *data) 686 { 687 struct memory_notify *arg = data; 688 689 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 690 return NOTIFY_BAD; 691 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 692 return NOTIFY_OK; 693 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 694 return NOTIFY_OK; 695 return NOTIFY_BAD; 696 } 697 698 static struct notifier_block kdump_mem_nb = { 699 .notifier_call = kdump_mem_notifier, 700 }; 701 702 #endif 703 704 /* 705 * Make sure that oldmem, where the dump is stored, is protected 706 */ 707 static void reserve_oldmem(void) 708 { 709 #ifdef CONFIG_CRASH_DUMP 710 unsigned long real_size = 0; 711 int i; 712 713 if (!OLDMEM_BASE) 714 return; 715 for (i = 0; i < MEMORY_CHUNKS; i++) { 716 struct mem_chunk *chunk = &memory_chunk[i]; 717 718 real_size = max(real_size, chunk->addr + chunk->size); 719 } 720 create_mem_hole(memory_chunk, OLDMEM_BASE, OLDMEM_SIZE); 721 create_mem_hole(memory_chunk, OLDMEM_SIZE, real_size - OLDMEM_SIZE); 722 #endif 723 } 724 725 /* 726 * Reserve memory for kdump kernel to be loaded with kexec 727 */ 728 static void __init reserve_crashkernel(void) 729 { 730 #ifdef CONFIG_CRASH_DUMP 731 unsigned long long crash_base, crash_size; 732 char *msg = NULL; 733 int rc; 734 735 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 736 &crash_base); 737 if (rc || crash_size == 0) 738 return; 739 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 740 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 741 if (register_memory_notifier(&kdump_mem_nb)) 742 return; 743 if (!crash_base) 744 crash_base = find_crash_base(crash_size, &msg); 745 if (!crash_base) { 746 pr_info("crashkernel reservation failed: %s\n", msg); 747 unregister_memory_notifier(&kdump_mem_nb); 748 return; 749 } 750 if (verify_crash_base(crash_base, crash_size, &msg)) { 751 pr_info("crashkernel reservation failed: %s\n", msg); 752 unregister_memory_notifier(&kdump_mem_nb); 753 return; 754 } 755 if (!OLDMEM_BASE && MACHINE_IS_VM) 756 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 757 crashk_res.start = crash_base; 758 crashk_res.end = crash_base + crash_size - 1; 759 insert_resource(&iomem_resource, &crashk_res); 760 create_mem_hole(memory_chunk, crash_base, crash_size); 761 pr_info("Reserving %lluMB of memory at %lluMB " 762 "for crashkernel (System RAM: %luMB)\n", 763 crash_size >> 20, crash_base >> 20, memory_end >> 20); 764 os_info_crashkernel_add(crash_base, crash_size); 765 #endif 766 } 767 768 static void __init setup_memory(void) 769 { 770 unsigned long bootmap_size; 771 unsigned long start_pfn, end_pfn; 772 int i; 773 774 /* 775 * partially used pages are not usable - thus 776 * we are rounding upwards: 777 */ 778 start_pfn = PFN_UP(__pa(&_end)); 779 end_pfn = max_pfn = PFN_DOWN(memory_end); 780 781 #ifdef CONFIG_BLK_DEV_INITRD 782 /* 783 * Move the initrd in case the bitmap of the bootmem allocater 784 * would overwrite it. 785 */ 786 787 if (INITRD_START && INITRD_SIZE) { 788 unsigned long bmap_size; 789 unsigned long start; 790 791 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 792 bmap_size = PFN_PHYS(bmap_size); 793 794 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 795 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 796 797 #ifdef CONFIG_CRASH_DUMP 798 if (OLDMEM_BASE) { 799 /* Move initrd behind kdump oldmem */ 800 if (start + INITRD_SIZE > OLDMEM_BASE && 801 start < OLDMEM_BASE + OLDMEM_SIZE) 802 start = OLDMEM_BASE + OLDMEM_SIZE; 803 } 804 #endif 805 if (start + INITRD_SIZE > memory_end) { 806 pr_err("initrd extends beyond end of " 807 "memory (0x%08lx > 0x%08lx) " 808 "disabling initrd\n", 809 start + INITRD_SIZE, memory_end); 810 INITRD_START = INITRD_SIZE = 0; 811 } else { 812 pr_info("Moving initrd (0x%08lx -> " 813 "0x%08lx, size: %ld)\n", 814 INITRD_START, start, INITRD_SIZE); 815 memmove((void *) start, (void *) INITRD_START, 816 INITRD_SIZE); 817 INITRD_START = start; 818 } 819 } 820 } 821 #endif 822 823 /* 824 * Initialize the boot-time allocator 825 */ 826 bootmap_size = init_bootmem(start_pfn, end_pfn); 827 828 /* 829 * Register RAM areas with the bootmem allocator. 830 */ 831 832 for (i = 0; i < MEMORY_CHUNKS; i++) { 833 unsigned long start_chunk, end_chunk, pfn; 834 835 if (!memory_chunk[i].size) 836 continue; 837 start_chunk = PFN_DOWN(memory_chunk[i].addr); 838 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 839 end_chunk = min(end_chunk, end_pfn); 840 if (start_chunk >= end_chunk) 841 continue; 842 memblock_add_node(PFN_PHYS(start_chunk), 843 PFN_PHYS(end_chunk - start_chunk), 0); 844 pfn = max(start_chunk, start_pfn); 845 storage_key_init_range(PFN_PHYS(pfn), PFN_PHYS(end_chunk)); 846 } 847 848 psw_set_key(PAGE_DEFAULT_KEY); 849 850 free_bootmem_with_active_regions(0, max_pfn); 851 852 /* 853 * Reserve memory used for lowcore/command line/kernel image. 854 */ 855 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 856 reserve_bootmem((unsigned long)_stext, 857 PFN_PHYS(start_pfn) - (unsigned long)_stext, 858 BOOTMEM_DEFAULT); 859 /* 860 * Reserve the bootmem bitmap itself as well. We do this in two 861 * steps (first step was init_bootmem()) because this catches 862 * the (very unlikely) case of us accidentally initializing the 863 * bootmem allocator with an invalid RAM area. 864 */ 865 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 866 BOOTMEM_DEFAULT); 867 868 #ifdef CONFIG_CRASH_DUMP 869 if (crashk_res.start) 870 reserve_bootmem(crashk_res.start, 871 crashk_res.end - crashk_res.start + 1, 872 BOOTMEM_DEFAULT); 873 if (is_kdump_kernel()) 874 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE, 875 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT); 876 #endif 877 #ifdef CONFIG_BLK_DEV_INITRD 878 if (INITRD_START && INITRD_SIZE) { 879 if (INITRD_START + INITRD_SIZE <= memory_end) { 880 reserve_bootmem(INITRD_START, INITRD_SIZE, 881 BOOTMEM_DEFAULT); 882 initrd_start = INITRD_START; 883 initrd_end = initrd_start + INITRD_SIZE; 884 } else { 885 pr_err("initrd extends beyond end of " 886 "memory (0x%08lx > 0x%08lx) " 887 "disabling initrd\n", 888 initrd_start + INITRD_SIZE, memory_end); 889 initrd_start = initrd_end = 0; 890 } 891 } 892 #endif 893 } 894 895 /* 896 * Setup hardware capabilities. 897 */ 898 static void __init setup_hwcaps(void) 899 { 900 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 901 struct cpuid cpu_id; 902 int i; 903 904 /* 905 * The store facility list bits numbers as found in the principles 906 * of operation are numbered with bit 1UL<<31 as number 0 to 907 * bit 1UL<<0 as number 31. 908 * Bit 0: instructions named N3, "backported" to esa-mode 909 * Bit 2: z/Architecture mode is active 910 * Bit 7: the store-facility-list-extended facility is installed 911 * Bit 17: the message-security assist is installed 912 * Bit 19: the long-displacement facility is installed 913 * Bit 21: the extended-immediate facility is installed 914 * Bit 22: extended-translation facility 3 is installed 915 * Bit 30: extended-translation facility 3 enhancement facility 916 * These get translated to: 917 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 918 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 919 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 920 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 921 */ 922 for (i = 0; i < 6; i++) 923 if (test_facility(stfl_bits[i])) 924 elf_hwcap |= 1UL << i; 925 926 if (test_facility(22) && test_facility(30)) 927 elf_hwcap |= HWCAP_S390_ETF3EH; 928 929 /* 930 * Check for additional facilities with store-facility-list-extended. 931 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 932 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 933 * as stored by stfl, bits 32-xxx contain additional facilities. 934 * How many facility words are stored depends on the number of 935 * doublewords passed to the instruction. The additional facilities 936 * are: 937 * Bit 42: decimal floating point facility is installed 938 * Bit 44: perform floating point operation facility is installed 939 * translated to: 940 * HWCAP_S390_DFP bit 6 (42 && 44). 941 */ 942 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 943 elf_hwcap |= HWCAP_S390_DFP; 944 945 /* 946 * Huge page support HWCAP_S390_HPAGE is bit 7. 947 */ 948 if (MACHINE_HAS_HPAGE) 949 elf_hwcap |= HWCAP_S390_HPAGE; 950 951 #if defined(CONFIG_64BIT) 952 /* 953 * 64-bit register support for 31-bit processes 954 * HWCAP_S390_HIGH_GPRS is bit 9. 955 */ 956 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 957 958 /* 959 * Transactional execution support HWCAP_S390_TE is bit 10. 960 */ 961 if (test_facility(50) && test_facility(73)) 962 elf_hwcap |= HWCAP_S390_TE; 963 #endif 964 965 get_cpu_id(&cpu_id); 966 switch (cpu_id.machine) { 967 case 0x9672: 968 #if !defined(CONFIG_64BIT) 969 default: /* Use "g5" as default for 31 bit kernels. */ 970 #endif 971 strcpy(elf_platform, "g5"); 972 break; 973 case 0x2064: 974 case 0x2066: 975 #if defined(CONFIG_64BIT) 976 default: /* Use "z900" as default for 64 bit kernels. */ 977 #endif 978 strcpy(elf_platform, "z900"); 979 break; 980 case 0x2084: 981 case 0x2086: 982 strcpy(elf_platform, "z990"); 983 break; 984 case 0x2094: 985 case 0x2096: 986 strcpy(elf_platform, "z9-109"); 987 break; 988 case 0x2097: 989 case 0x2098: 990 strcpy(elf_platform, "z10"); 991 break; 992 case 0x2817: 993 case 0x2818: 994 strcpy(elf_platform, "z196"); 995 break; 996 case 0x2827: 997 case 0x2828: 998 strcpy(elf_platform, "zEC12"); 999 break; 1000 } 1001 } 1002 1003 /* 1004 * Setup function called from init/main.c just after the banner 1005 * was printed. 1006 */ 1007 1008 void __init setup_arch(char **cmdline_p) 1009 { 1010 /* 1011 * print what head.S has found out about the machine 1012 */ 1013 #ifndef CONFIG_64BIT 1014 if (MACHINE_IS_VM) 1015 pr_info("Linux is running as a z/VM " 1016 "guest operating system in 31-bit mode\n"); 1017 else if (MACHINE_IS_LPAR) 1018 pr_info("Linux is running natively in 31-bit mode\n"); 1019 if (MACHINE_HAS_IEEE) 1020 pr_info("The hardware system has IEEE compatible " 1021 "floating point units\n"); 1022 else 1023 pr_info("The hardware system has no IEEE compatible " 1024 "floating point units\n"); 1025 #else /* CONFIG_64BIT */ 1026 if (MACHINE_IS_VM) 1027 pr_info("Linux is running as a z/VM " 1028 "guest operating system in 64-bit mode\n"); 1029 else if (MACHINE_IS_KVM) 1030 pr_info("Linux is running under KVM in 64-bit mode\n"); 1031 else if (MACHINE_IS_LPAR) 1032 pr_info("Linux is running natively in 64-bit mode\n"); 1033 #endif /* CONFIG_64BIT */ 1034 1035 /* Have one command line that is parsed and saved in /proc/cmdline */ 1036 /* boot_command_line has been already set up in early.c */ 1037 *cmdline_p = boot_command_line; 1038 1039 ROOT_DEV = Root_RAM0; 1040 1041 init_mm.start_code = PAGE_OFFSET; 1042 init_mm.end_code = (unsigned long) &_etext; 1043 init_mm.end_data = (unsigned long) &_edata; 1044 init_mm.brk = (unsigned long) &_end; 1045 1046 if (MACHINE_HAS_MVCOS) 1047 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 1048 else 1049 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 1050 1051 parse_early_param(); 1052 detect_memory_layout(memory_chunk, memory_end); 1053 os_info_init(); 1054 setup_ipl(); 1055 reserve_oldmem(); 1056 setup_memory_end(); 1057 setup_addressing_mode(); 1058 reserve_crashkernel(); 1059 setup_memory(); 1060 setup_resources(); 1061 setup_vmcoreinfo(); 1062 setup_lowcore(); 1063 1064 cpu_init(); 1065 s390_init_cpu_topology(); 1066 1067 /* 1068 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 1069 */ 1070 setup_hwcaps(); 1071 1072 /* 1073 * Create kernel page tables and switch to virtual addressing. 1074 */ 1075 paging_init(); 1076 1077 /* Setup default console */ 1078 conmode_default(); 1079 set_preferred_console(); 1080 1081 /* Setup zfcpdump support */ 1082 setup_zfcpdump(); 1083 } 1084