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(unsigned int console_devno) 230 { 231 static char str[41]; 232 233 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 234 return; 235 if (OLDMEM_BASE) 236 return; 237 if (console_devno != -1) 238 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 239 ipl_info.data.fcp.dev_id.devno, console_devno); 240 else 241 sprintf(str, " cio_ignore=all,!0.0.%04x", 242 ipl_info.data.fcp.dev_id.devno); 243 strcat(boot_command_line, str); 244 console_loglevel = 2; 245 } 246 #else 247 static inline void setup_zfcpdump(unsigned int console_devno) {} 248 #endif /* CONFIG_ZFCPDUMP */ 249 250 /* 251 * Reboot, halt and power_off stubs. They just call _machine_restart, 252 * _machine_halt or _machine_power_off. 253 */ 254 255 void machine_restart(char *command) 256 { 257 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 258 /* 259 * Only unblank the console if we are called in enabled 260 * context or a bust_spinlocks cleared the way for us. 261 */ 262 console_unblank(); 263 _machine_restart(command); 264 } 265 266 void machine_halt(void) 267 { 268 if (!in_interrupt() || oops_in_progress) 269 /* 270 * Only unblank the console if we are called in enabled 271 * context or a bust_spinlocks cleared the way for us. 272 */ 273 console_unblank(); 274 _machine_halt(); 275 } 276 277 void machine_power_off(void) 278 { 279 if (!in_interrupt() || oops_in_progress) 280 /* 281 * Only unblank the console if we are called in enabled 282 * context or a bust_spinlocks cleared the way for us. 283 */ 284 console_unblank(); 285 _machine_power_off(); 286 } 287 288 /* 289 * Dummy power off function. 290 */ 291 void (*pm_power_off)(void) = machine_power_off; 292 EXPORT_SYMBOL_GPL(pm_power_off); 293 294 static int __init early_parse_mem(char *p) 295 { 296 memory_end = memparse(p, &p); 297 memory_end_set = 1; 298 return 0; 299 } 300 early_param("mem", early_parse_mem); 301 302 static int __init parse_vmalloc(char *arg) 303 { 304 if (!arg) 305 return -EINVAL; 306 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK; 307 return 0; 308 } 309 early_param("vmalloc", parse_vmalloc); 310 311 unsigned int s390_user_mode = PRIMARY_SPACE_MODE; 312 EXPORT_SYMBOL_GPL(s390_user_mode); 313 314 static void __init set_user_mode_primary(void) 315 { 316 psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME; 317 psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY; 318 #ifdef CONFIG_COMPAT 319 psw32_user_bits = 320 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY; 321 #endif 322 uaccess = MACHINE_HAS_MVCOS ? uaccess_mvcos_switch : uaccess_pt; 323 } 324 325 static int __init early_parse_user_mode(char *p) 326 { 327 if (p && strcmp(p, "primary") == 0) 328 s390_user_mode = PRIMARY_SPACE_MODE; 329 else if (!p || strcmp(p, "home") == 0) 330 s390_user_mode = HOME_SPACE_MODE; 331 else 332 return 1; 333 return 0; 334 } 335 early_param("user_mode", early_parse_user_mode); 336 337 static void __init setup_addressing_mode(void) 338 { 339 if (s390_user_mode != PRIMARY_SPACE_MODE) 340 return; 341 set_user_mode_primary(); 342 if (MACHINE_HAS_MVCOS) 343 pr_info("Address spaces switched, mvcos available\n"); 344 else 345 pr_info("Address spaces switched, mvcos not available\n"); 346 } 347 348 void *restart_stack __attribute__((__section__(".data"))); 349 350 static void __init setup_lowcore(void) 351 { 352 struct _lowcore *lc; 353 354 /* 355 * Setup lowcore for boot cpu 356 */ 357 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); 358 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 359 lc->restart_psw.mask = psw_kernel_bits; 360 lc->restart_psw.addr = 361 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 362 lc->external_new_psw.mask = psw_kernel_bits | 363 PSW_MASK_DAT | PSW_MASK_MCHECK; 364 lc->external_new_psw.addr = 365 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 366 lc->svc_new_psw.mask = psw_kernel_bits | 367 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; 368 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 369 lc->program_new_psw.mask = psw_kernel_bits | 370 PSW_MASK_DAT | PSW_MASK_MCHECK; 371 lc->program_new_psw.addr = 372 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler; 373 lc->mcck_new_psw.mask = psw_kernel_bits; 374 lc->mcck_new_psw.addr = 375 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 376 lc->io_new_psw.mask = psw_kernel_bits | 377 PSW_MASK_DAT | PSW_MASK_MCHECK; 378 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 379 lc->clock_comparator = -1ULL; 380 lc->kernel_stack = ((unsigned long) &init_thread_union) 381 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 382 lc->async_stack = (unsigned long) 383 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) 384 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 385 lc->panic_stack = (unsigned long) 386 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) 387 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 388 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 389 lc->thread_info = (unsigned long) &init_thread_union; 390 lc->machine_flags = S390_lowcore.machine_flags; 391 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 392 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 393 MAX_FACILITY_BIT/8); 394 #ifndef CONFIG_64BIT 395 if (MACHINE_HAS_IEEE) { 396 lc->extended_save_area_addr = (__u32) 397 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0); 398 /* enable extended save area */ 399 __ctl_set_bit(14, 29); 400 } 401 #else 402 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 403 #endif 404 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 405 lc->async_enter_timer = S390_lowcore.async_enter_timer; 406 lc->exit_timer = S390_lowcore.exit_timer; 407 lc->user_timer = S390_lowcore.user_timer; 408 lc->system_timer = S390_lowcore.system_timer; 409 lc->steal_timer = S390_lowcore.steal_timer; 410 lc->last_update_timer = S390_lowcore.last_update_timer; 411 lc->last_update_clock = S390_lowcore.last_update_clock; 412 lc->ftrace_func = S390_lowcore.ftrace_func; 413 414 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 415 restart_stack += ASYNC_SIZE; 416 417 /* 418 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 419 * restart data to the absolute zero lowcore. This is necesary if 420 * PSW restart is done on an offline CPU that has lowcore zero. 421 */ 422 lc->restart_stack = (unsigned long) restart_stack; 423 lc->restart_fn = (unsigned long) do_restart; 424 lc->restart_data = 0; 425 lc->restart_source = -1UL; 426 427 /* Setup absolute zero lowcore */ 428 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 429 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 430 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 431 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 432 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 433 434 set_prefix((u32)(unsigned long) lc); 435 lowcore_ptr[0] = lc; 436 } 437 438 static struct resource code_resource = { 439 .name = "Kernel code", 440 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 441 }; 442 443 static struct resource data_resource = { 444 .name = "Kernel data", 445 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 446 }; 447 448 static struct resource bss_resource = { 449 .name = "Kernel bss", 450 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 451 }; 452 453 static struct resource __initdata *standard_resources[] = { 454 &code_resource, 455 &data_resource, 456 &bss_resource, 457 }; 458 459 static void __init setup_resources(void) 460 { 461 struct resource *res, *std_res, *sub_res; 462 int i, j; 463 464 code_resource.start = (unsigned long) &_text; 465 code_resource.end = (unsigned long) &_etext - 1; 466 data_resource.start = (unsigned long) &_etext; 467 data_resource.end = (unsigned long) &_edata - 1; 468 bss_resource.start = (unsigned long) &__bss_start; 469 bss_resource.end = (unsigned long) &__bss_stop - 1; 470 471 for (i = 0; i < MEMORY_CHUNKS; i++) { 472 if (!memory_chunk[i].size) 473 continue; 474 if (memory_chunk[i].type == CHUNK_OLDMEM || 475 memory_chunk[i].type == CHUNK_CRASHK) 476 continue; 477 res = alloc_bootmem_low(sizeof(*res)); 478 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 479 switch (memory_chunk[i].type) { 480 case CHUNK_READ_WRITE: 481 case CHUNK_CRASHK: 482 res->name = "System RAM"; 483 break; 484 case CHUNK_READ_ONLY: 485 res->name = "System ROM"; 486 res->flags |= IORESOURCE_READONLY; 487 break; 488 default: 489 res->name = "reserved"; 490 } 491 res->start = memory_chunk[i].addr; 492 res->end = res->start + memory_chunk[i].size - 1; 493 request_resource(&iomem_resource, res); 494 495 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 496 std_res = standard_resources[j]; 497 if (std_res->start < res->start || 498 std_res->start > res->end) 499 continue; 500 if (std_res->end > res->end) { 501 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 502 *sub_res = *std_res; 503 sub_res->end = res->end; 504 std_res->start = res->end + 1; 505 request_resource(res, sub_res); 506 } else { 507 request_resource(res, std_res); 508 } 509 } 510 } 511 } 512 513 unsigned long real_memory_size; 514 EXPORT_SYMBOL_GPL(real_memory_size); 515 516 static void __init setup_memory_end(void) 517 { 518 unsigned long vmax, vmalloc_size, tmp; 519 int i; 520 521 522 #ifdef CONFIG_ZFCPDUMP 523 if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) { 524 memory_end = ZFCPDUMP_HSA_SIZE; 525 memory_end_set = 1; 526 } 527 #endif 528 real_memory_size = 0; 529 memory_end &= PAGE_MASK; 530 531 /* 532 * Make sure all chunks are MAX_ORDER aligned so we don't need the 533 * extra checks that HOLES_IN_ZONE would require. 534 */ 535 for (i = 0; i < MEMORY_CHUNKS; i++) { 536 unsigned long start, end; 537 struct mem_chunk *chunk; 538 unsigned long align; 539 540 chunk = &memory_chunk[i]; 541 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 542 start = (chunk->addr + align - 1) & ~(align - 1); 543 end = (chunk->addr + chunk->size) & ~(align - 1); 544 if (start >= end) 545 memset(chunk, 0, sizeof(*chunk)); 546 else { 547 chunk->addr = start; 548 chunk->size = end - start; 549 } 550 real_memory_size = max(real_memory_size, 551 chunk->addr + chunk->size); 552 } 553 554 /* Choose kernel address space layout: 2, 3, or 4 levels. */ 555 #ifdef CONFIG_64BIT 556 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; 557 tmp = (memory_end ?: real_memory_size) / PAGE_SIZE; 558 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size; 559 if (tmp <= (1UL << 42)) 560 vmax = 1UL << 42; /* 3-level kernel page table */ 561 else 562 vmax = 1UL << 53; /* 4-level kernel page table */ 563 /* module area is at the end of the kernel address space. */ 564 MODULES_END = vmax; 565 MODULES_VADDR = MODULES_END - MODULES_LEN; 566 VMALLOC_END = MODULES_VADDR; 567 #else 568 vmalloc_size = VMALLOC_END ?: 96UL << 20; 569 vmax = 1UL << 31; /* 2-level kernel page table */ 570 /* vmalloc area is at the end of the kernel address space. */ 571 VMALLOC_END = vmax; 572 #endif 573 VMALLOC_START = vmax - vmalloc_size; 574 575 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 576 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 577 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 578 tmp = SECTION_ALIGN_UP(tmp); 579 tmp = VMALLOC_START - tmp * sizeof(struct page); 580 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 581 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 582 vmemmap = (struct page *) tmp; 583 584 /* Take care that memory_end is set and <= vmemmap */ 585 memory_end = min(memory_end ?: real_memory_size, tmp); 586 587 /* Fixup memory chunk array to fit into 0..memory_end */ 588 for (i = 0; i < MEMORY_CHUNKS; i++) { 589 struct mem_chunk *chunk = &memory_chunk[i]; 590 591 if (chunk->addr >= memory_end) { 592 memset(chunk, 0, sizeof(*chunk)); 593 continue; 594 } 595 if (chunk->addr + chunk->size > memory_end) 596 chunk->size = memory_end - chunk->addr; 597 } 598 } 599 600 static void __init setup_vmcoreinfo(void) 601 { 602 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note()); 603 } 604 605 #ifdef CONFIG_CRASH_DUMP 606 607 /* 608 * Find suitable location for crashkernel memory 609 */ 610 static unsigned long __init find_crash_base(unsigned long crash_size, 611 char **msg) 612 { 613 unsigned long crash_base; 614 struct mem_chunk *chunk; 615 int i; 616 617 if (memory_chunk[0].size < crash_size) { 618 *msg = "first memory chunk must be at least crashkernel size"; 619 return 0; 620 } 621 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE) 622 return OLDMEM_BASE; 623 624 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) { 625 chunk = &memory_chunk[i]; 626 if (chunk->size == 0) 627 continue; 628 if (chunk->type != CHUNK_READ_WRITE) 629 continue; 630 if (chunk->size < crash_size) 631 continue; 632 crash_base = (chunk->addr + chunk->size) - crash_size; 633 if (crash_base < crash_size) 634 continue; 635 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX) 636 continue; 637 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE) 638 continue; 639 return crash_base; 640 } 641 *msg = "no suitable area found"; 642 return 0; 643 } 644 645 /* 646 * Check if crash_base and crash_size is valid 647 */ 648 static int __init verify_crash_base(unsigned long crash_base, 649 unsigned long crash_size, 650 char **msg) 651 { 652 struct mem_chunk *chunk; 653 int i; 654 655 /* 656 * Because we do the swap to zero, we must have at least 'crash_size' 657 * bytes free space before crash_base 658 */ 659 if (crash_size > crash_base) { 660 *msg = "crashkernel offset must be greater than size"; 661 return -EINVAL; 662 } 663 664 /* First memory chunk must be at least crash_size */ 665 if (memory_chunk[0].size < crash_size) { 666 *msg = "first memory chunk must be at least crashkernel size"; 667 return -EINVAL; 668 } 669 /* Check if we fit into the respective memory chunk */ 670 for (i = 0; i < MEMORY_CHUNKS; i++) { 671 chunk = &memory_chunk[i]; 672 if (chunk->size == 0) 673 continue; 674 if (crash_base < chunk->addr) 675 continue; 676 if (crash_base >= chunk->addr + chunk->size) 677 continue; 678 /* we have found the memory chunk */ 679 if (crash_base + crash_size > chunk->addr + chunk->size) { 680 *msg = "selected memory chunk is too small for " 681 "crashkernel memory"; 682 return -EINVAL; 683 } 684 return 0; 685 } 686 *msg = "invalid memory range specified"; 687 return -EINVAL; 688 } 689 690 /* 691 * Reserve kdump memory by creating a memory hole in the mem_chunk array 692 */ 693 static void __init reserve_kdump_bootmem(unsigned long addr, unsigned long size, 694 int type) 695 { 696 create_mem_hole(memory_chunk, addr, size, type); 697 } 698 699 /* 700 * When kdump is enabled, we have to ensure that no memory from 701 * the area [0 - crashkernel memory size] and 702 * [crashk_res.start - crashk_res.end] is set offline. 703 */ 704 static int kdump_mem_notifier(struct notifier_block *nb, 705 unsigned long action, void *data) 706 { 707 struct memory_notify *arg = data; 708 709 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 710 return NOTIFY_BAD; 711 if (arg->start_pfn > PFN_DOWN(crashk_res.end)) 712 return NOTIFY_OK; 713 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start)) 714 return NOTIFY_OK; 715 return NOTIFY_BAD; 716 } 717 718 static struct notifier_block kdump_mem_nb = { 719 .notifier_call = kdump_mem_notifier, 720 }; 721 722 #endif 723 724 /* 725 * Make sure that oldmem, where the dump is stored, is protected 726 */ 727 static void reserve_oldmem(void) 728 { 729 #ifdef CONFIG_CRASH_DUMP 730 if (!OLDMEM_BASE) 731 return; 732 733 reserve_kdump_bootmem(OLDMEM_BASE, OLDMEM_SIZE, CHUNK_OLDMEM); 734 reserve_kdump_bootmem(OLDMEM_SIZE, memory_end - OLDMEM_SIZE, 735 CHUNK_OLDMEM); 736 if (OLDMEM_BASE + OLDMEM_SIZE == real_memory_size) 737 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1; 738 else 739 saved_max_pfn = PFN_DOWN(real_memory_size) - 1; 740 #endif 741 } 742 743 /* 744 * Reserve memory for kdump kernel to be loaded with kexec 745 */ 746 static void __init reserve_crashkernel(void) 747 { 748 #ifdef CONFIG_CRASH_DUMP 749 unsigned long long crash_base, crash_size; 750 char *msg = NULL; 751 int rc; 752 753 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, 754 &crash_base); 755 if (rc || crash_size == 0) 756 return; 757 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 758 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 759 if (register_memory_notifier(&kdump_mem_nb)) 760 return; 761 if (!crash_base) 762 crash_base = find_crash_base(crash_size, &msg); 763 if (!crash_base) { 764 pr_info("crashkernel reservation failed: %s\n", msg); 765 unregister_memory_notifier(&kdump_mem_nb); 766 return; 767 } 768 if (verify_crash_base(crash_base, crash_size, &msg)) { 769 pr_info("crashkernel reservation failed: %s\n", msg); 770 unregister_memory_notifier(&kdump_mem_nb); 771 return; 772 } 773 if (!OLDMEM_BASE && MACHINE_IS_VM) 774 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 775 crashk_res.start = crash_base; 776 crashk_res.end = crash_base + crash_size - 1; 777 insert_resource(&iomem_resource, &crashk_res); 778 reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK); 779 pr_info("Reserving %lluMB of memory at %lluMB " 780 "for crashkernel (System RAM: %luMB)\n", 781 crash_size >> 20, crash_base >> 20, memory_end >> 20); 782 os_info_crashkernel_add(crash_base, crash_size); 783 #endif 784 } 785 786 static void __init setup_memory(void) 787 { 788 unsigned long bootmap_size; 789 unsigned long start_pfn, end_pfn; 790 int i; 791 792 /* 793 * partially used pages are not usable - thus 794 * we are rounding upwards: 795 */ 796 start_pfn = PFN_UP(__pa(&_end)); 797 end_pfn = max_pfn = PFN_DOWN(memory_end); 798 799 #ifdef CONFIG_BLK_DEV_INITRD 800 /* 801 * Move the initrd in case the bitmap of the bootmem allocater 802 * would overwrite it. 803 */ 804 805 if (INITRD_START && INITRD_SIZE) { 806 unsigned long bmap_size; 807 unsigned long start; 808 809 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 810 bmap_size = PFN_PHYS(bmap_size); 811 812 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 813 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 814 815 #ifdef CONFIG_CRASH_DUMP 816 if (OLDMEM_BASE) { 817 /* Move initrd behind kdump oldmem */ 818 if (start + INITRD_SIZE > OLDMEM_BASE && 819 start < OLDMEM_BASE + OLDMEM_SIZE) 820 start = OLDMEM_BASE + OLDMEM_SIZE; 821 } 822 #endif 823 if (start + INITRD_SIZE > memory_end) { 824 pr_err("initrd extends beyond end of " 825 "memory (0x%08lx > 0x%08lx) " 826 "disabling initrd\n", 827 start + INITRD_SIZE, memory_end); 828 INITRD_START = INITRD_SIZE = 0; 829 } else { 830 pr_info("Moving initrd (0x%08lx -> " 831 "0x%08lx, size: %ld)\n", 832 INITRD_START, start, INITRD_SIZE); 833 memmove((void *) start, (void *) INITRD_START, 834 INITRD_SIZE); 835 INITRD_START = start; 836 } 837 } 838 } 839 #endif 840 841 /* 842 * Initialize the boot-time allocator 843 */ 844 bootmap_size = init_bootmem(start_pfn, end_pfn); 845 846 /* 847 * Register RAM areas with the bootmem allocator. 848 */ 849 850 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 851 unsigned long start_chunk, end_chunk, pfn; 852 853 if (memory_chunk[i].type != CHUNK_READ_WRITE && 854 memory_chunk[i].type != CHUNK_CRASHK) 855 continue; 856 start_chunk = PFN_DOWN(memory_chunk[i].addr); 857 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 858 end_chunk = min(end_chunk, end_pfn); 859 if (start_chunk >= end_chunk) 860 continue; 861 memblock_add_node(PFN_PHYS(start_chunk), 862 PFN_PHYS(end_chunk - start_chunk), 0); 863 pfn = max(start_chunk, start_pfn); 864 storage_key_init_range(PFN_PHYS(pfn), PFN_PHYS(end_chunk)); 865 } 866 867 psw_set_key(PAGE_DEFAULT_KEY); 868 869 free_bootmem_with_active_regions(0, max_pfn); 870 871 /* 872 * Reserve memory used for lowcore/command line/kernel image. 873 */ 874 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 875 reserve_bootmem((unsigned long)_stext, 876 PFN_PHYS(start_pfn) - (unsigned long)_stext, 877 BOOTMEM_DEFAULT); 878 /* 879 * Reserve the bootmem bitmap itself as well. We do this in two 880 * steps (first step was init_bootmem()) because this catches 881 * the (very unlikely) case of us accidentally initializing the 882 * bootmem allocator with an invalid RAM area. 883 */ 884 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 885 BOOTMEM_DEFAULT); 886 887 #ifdef CONFIG_CRASH_DUMP 888 if (crashk_res.start) 889 reserve_bootmem(crashk_res.start, 890 crashk_res.end - crashk_res.start + 1, 891 BOOTMEM_DEFAULT); 892 if (is_kdump_kernel()) 893 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE, 894 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT); 895 #endif 896 #ifdef CONFIG_BLK_DEV_INITRD 897 if (INITRD_START && INITRD_SIZE) { 898 if (INITRD_START + INITRD_SIZE <= memory_end) { 899 reserve_bootmem(INITRD_START, INITRD_SIZE, 900 BOOTMEM_DEFAULT); 901 initrd_start = INITRD_START; 902 initrd_end = initrd_start + INITRD_SIZE; 903 } else { 904 pr_err("initrd extends beyond end of " 905 "memory (0x%08lx > 0x%08lx) " 906 "disabling initrd\n", 907 initrd_start + INITRD_SIZE, memory_end); 908 initrd_start = initrd_end = 0; 909 } 910 } 911 #endif 912 } 913 914 /* 915 * Setup hardware capabilities. 916 */ 917 static void __init setup_hwcaps(void) 918 { 919 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 920 struct cpuid cpu_id; 921 int i; 922 923 /* 924 * The store facility list bits numbers as found in the principles 925 * of operation are numbered with bit 1UL<<31 as number 0 to 926 * bit 1UL<<0 as number 31. 927 * Bit 0: instructions named N3, "backported" to esa-mode 928 * Bit 2: z/Architecture mode is active 929 * Bit 7: the store-facility-list-extended facility is installed 930 * Bit 17: the message-security assist is installed 931 * Bit 19: the long-displacement facility is installed 932 * Bit 21: the extended-immediate facility is installed 933 * Bit 22: extended-translation facility 3 is installed 934 * Bit 30: extended-translation facility 3 enhancement facility 935 * These get translated to: 936 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 937 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 938 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 939 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 940 */ 941 for (i = 0; i < 6; i++) 942 if (test_facility(stfl_bits[i])) 943 elf_hwcap |= 1UL << i; 944 945 if (test_facility(22) && test_facility(30)) 946 elf_hwcap |= HWCAP_S390_ETF3EH; 947 948 /* 949 * Check for additional facilities with store-facility-list-extended. 950 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 951 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 952 * as stored by stfl, bits 32-xxx contain additional facilities. 953 * How many facility words are stored depends on the number of 954 * doublewords passed to the instruction. The additional facilities 955 * are: 956 * Bit 42: decimal floating point facility is installed 957 * Bit 44: perform floating point operation facility is installed 958 * translated to: 959 * HWCAP_S390_DFP bit 6 (42 && 44). 960 */ 961 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 962 elf_hwcap |= HWCAP_S390_DFP; 963 964 /* 965 * Huge page support HWCAP_S390_HPAGE is bit 7. 966 */ 967 if (MACHINE_HAS_HPAGE) 968 elf_hwcap |= HWCAP_S390_HPAGE; 969 970 #if defined(CONFIG_64BIT) 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 /* 978 * Transactional execution support HWCAP_S390_TE is bit 10. 979 */ 980 if (test_facility(50) && test_facility(73)) 981 elf_hwcap |= HWCAP_S390_TE; 982 #endif 983 984 get_cpu_id(&cpu_id); 985 switch (cpu_id.machine) { 986 case 0x9672: 987 #if !defined(CONFIG_64BIT) 988 default: /* Use "g5" as default for 31 bit kernels. */ 989 #endif 990 strcpy(elf_platform, "g5"); 991 break; 992 case 0x2064: 993 case 0x2066: 994 #if defined(CONFIG_64BIT) 995 default: /* Use "z900" as default for 64 bit kernels. */ 996 #endif 997 strcpy(elf_platform, "z900"); 998 break; 999 case 0x2084: 1000 case 0x2086: 1001 strcpy(elf_platform, "z990"); 1002 break; 1003 case 0x2094: 1004 case 0x2096: 1005 strcpy(elf_platform, "z9-109"); 1006 break; 1007 case 0x2097: 1008 case 0x2098: 1009 strcpy(elf_platform, "z10"); 1010 break; 1011 case 0x2817: 1012 case 0x2818: 1013 strcpy(elf_platform, "z196"); 1014 break; 1015 case 0x2827: 1016 strcpy(elf_platform, "zEC12"); 1017 break; 1018 } 1019 } 1020 1021 /* 1022 * Setup function called from init/main.c just after the banner 1023 * was printed. 1024 */ 1025 1026 void __init setup_arch(char **cmdline_p) 1027 { 1028 /* 1029 * print what head.S has found out about the machine 1030 */ 1031 #ifndef CONFIG_64BIT 1032 if (MACHINE_IS_VM) 1033 pr_info("Linux is running as a z/VM " 1034 "guest operating system in 31-bit mode\n"); 1035 else if (MACHINE_IS_LPAR) 1036 pr_info("Linux is running natively in 31-bit mode\n"); 1037 if (MACHINE_HAS_IEEE) 1038 pr_info("The hardware system has IEEE compatible " 1039 "floating point units\n"); 1040 else 1041 pr_info("The hardware system has no IEEE compatible " 1042 "floating point units\n"); 1043 #else /* CONFIG_64BIT */ 1044 if (MACHINE_IS_VM) 1045 pr_info("Linux is running as a z/VM " 1046 "guest operating system in 64-bit mode\n"); 1047 else if (MACHINE_IS_KVM) 1048 pr_info("Linux is running under KVM in 64-bit mode\n"); 1049 else if (MACHINE_IS_LPAR) 1050 pr_info("Linux is running natively in 64-bit mode\n"); 1051 #endif /* CONFIG_64BIT */ 1052 1053 /* Have one command line that is parsed and saved in /proc/cmdline */ 1054 /* boot_command_line has been already set up in early.c */ 1055 *cmdline_p = boot_command_line; 1056 1057 ROOT_DEV = Root_RAM0; 1058 1059 init_mm.start_code = PAGE_OFFSET; 1060 init_mm.end_code = (unsigned long) &_etext; 1061 init_mm.end_data = (unsigned long) &_edata; 1062 init_mm.brk = (unsigned long) &_end; 1063 1064 if (MACHINE_HAS_MVCOS) 1065 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 1066 else 1067 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 1068 1069 parse_early_param(); 1070 1071 os_info_init(); 1072 setup_ipl(); 1073 setup_memory_end(); 1074 setup_addressing_mode(); 1075 reserve_oldmem(); 1076 reserve_crashkernel(); 1077 setup_memory(); 1078 setup_resources(); 1079 setup_vmcoreinfo(); 1080 setup_lowcore(); 1081 1082 cpu_init(); 1083 s390_init_cpu_topology(); 1084 1085 /* 1086 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 1087 */ 1088 setup_hwcaps(); 1089 1090 /* 1091 * Create kernel page tables and switch to virtual addressing. 1092 */ 1093 paging_init(); 1094 1095 /* Setup default console */ 1096 conmode_default(); 1097 set_preferred_console(); 1098 1099 /* Setup zfcpdump support */ 1100 setup_zfcpdump(console_devno); 1101 } 1102