1 /* 2 * arch/s390/kernel/setup.c 3 * 4 * S390 version 5 * Copyright (C) IBM Corp. 1999,2010 6 * Author(s): Hartmut Penner (hp@de.ibm.com), 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 * 9 * Derived from "arch/i386/kernel/setup.c" 10 * Copyright (C) 1995, Linus Torvalds 11 */ 12 13 /* 14 * This file handles the architecture-dependent parts of initialization 15 */ 16 17 #define KMSG_COMPONENT "setup" 18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 19 20 #include <linux/errno.h> 21 #include <linux/module.h> 22 #include <linux/sched.h> 23 #include <linux/kernel.h> 24 #include <linux/mm.h> 25 #include <linux/stddef.h> 26 #include <linux/unistd.h> 27 #include <linux/ptrace.h> 28 #include <linux/user.h> 29 #include <linux/tty.h> 30 #include <linux/ioport.h> 31 #include <linux/delay.h> 32 #include <linux/init.h> 33 #include <linux/initrd.h> 34 #include <linux/bootmem.h> 35 #include <linux/root_dev.h> 36 #include <linux/console.h> 37 #include <linux/kernel_stat.h> 38 #include <linux/device.h> 39 #include <linux/notifier.h> 40 #include <linux/pfn.h> 41 #include <linux/ctype.h> 42 #include <linux/reboot.h> 43 #include <linux/topology.h> 44 #include <linux/ftrace.h> 45 46 #include <asm/ipl.h> 47 #include <asm/uaccess.h> 48 #include <asm/system.h> 49 #include <asm/smp.h> 50 #include <asm/mmu_context.h> 51 #include <asm/cpcmd.h> 52 #include <asm/lowcore.h> 53 #include <asm/irq.h> 54 #include <asm/page.h> 55 #include <asm/ptrace.h> 56 #include <asm/sections.h> 57 #include <asm/ebcdic.h> 58 #include <asm/compat.h> 59 #include <asm/kvm_virtio.h> 60 61 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY | 62 PSW_MASK_MCHECK | PSW_DEFAULT_KEY); 63 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 64 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 65 PSW_MASK_PSTATE | PSW_DEFAULT_KEY); 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 /* An array with a pointer to the lowcore of every CPU. */ 94 struct _lowcore *lowcore_ptr[NR_CPUS]; 95 EXPORT_SYMBOL(lowcore_ptr); 96 97 /* 98 * This is set up by the setup-routine at boot-time 99 * for S390 need to find out, what we have to setup 100 * using address 0x10400 ... 101 */ 102 103 #include <asm/setup.h> 104 105 /* 106 * condev= and conmode= setup parameter. 107 */ 108 109 static int __init condev_setup(char *str) 110 { 111 int vdev; 112 113 vdev = simple_strtoul(str, &str, 0); 114 if (vdev >= 0 && vdev < 65536) { 115 console_devno = vdev; 116 console_irq = -1; 117 } 118 return 1; 119 } 120 121 __setup("condev=", condev_setup); 122 123 static void __init set_preferred_console(void) 124 { 125 if (MACHINE_IS_KVM) 126 add_preferred_console("hvc", 0, NULL); 127 else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 128 add_preferred_console("ttyS", 0, NULL); 129 else if (CONSOLE_IS_3270) 130 add_preferred_console("tty3270", 0, NULL); 131 } 132 133 static int __init conmode_setup(char *str) 134 { 135 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 136 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 137 SET_CONSOLE_SCLP; 138 #endif 139 #if defined(CONFIG_TN3215_CONSOLE) 140 if (strncmp(str, "3215", 5) == 0) 141 SET_CONSOLE_3215; 142 #endif 143 #if defined(CONFIG_TN3270_CONSOLE) 144 if (strncmp(str, "3270", 5) == 0) 145 SET_CONSOLE_3270; 146 #endif 147 set_preferred_console(); 148 return 1; 149 } 150 151 __setup("conmode=", conmode_setup); 152 153 static void __init conmode_default(void) 154 { 155 char query_buffer[1024]; 156 char *ptr; 157 158 if (MACHINE_IS_VM) { 159 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 160 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 161 ptr = strstr(query_buffer, "SUBCHANNEL ="); 162 console_irq = simple_strtoul(ptr + 13, NULL, 16); 163 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 164 ptr = strstr(query_buffer, "CONMODE"); 165 /* 166 * Set the conmode to 3215 so that the device recognition 167 * will set the cu_type of the console to 3215. If the 168 * conmode is 3270 and we don't set it back then both 169 * 3215 and the 3270 driver will try to access the console 170 * device (3215 as console and 3270 as normal tty). 171 */ 172 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 173 if (ptr == NULL) { 174 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 175 SET_CONSOLE_SCLP; 176 #endif 177 return; 178 } 179 if (strncmp(ptr + 8, "3270", 4) == 0) { 180 #if defined(CONFIG_TN3270_CONSOLE) 181 SET_CONSOLE_3270; 182 #elif defined(CONFIG_TN3215_CONSOLE) 183 SET_CONSOLE_3215; 184 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 185 SET_CONSOLE_SCLP; 186 #endif 187 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 188 #if defined(CONFIG_TN3215_CONSOLE) 189 SET_CONSOLE_3215; 190 #elif defined(CONFIG_TN3270_CONSOLE) 191 SET_CONSOLE_3270; 192 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 193 SET_CONSOLE_SCLP; 194 #endif 195 } 196 } else { 197 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 198 SET_CONSOLE_SCLP; 199 #endif 200 } 201 } 202 203 #ifdef CONFIG_ZFCPDUMP 204 static void __init setup_zfcpdump(unsigned int console_devno) 205 { 206 static char str[41]; 207 208 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 209 return; 210 if (console_devno != -1) 211 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x", 212 ipl_info.data.fcp.dev_id.devno, console_devno); 213 else 214 sprintf(str, " cio_ignore=all,!0.0.%04x", 215 ipl_info.data.fcp.dev_id.devno); 216 strcat(boot_command_line, str); 217 console_loglevel = 2; 218 } 219 #else 220 static inline void setup_zfcpdump(unsigned int console_devno) {} 221 #endif /* CONFIG_ZFCPDUMP */ 222 223 /* 224 * Reboot, halt and power_off stubs. They just call _machine_restart, 225 * _machine_halt or _machine_power_off. 226 */ 227 228 void machine_restart(char *command) 229 { 230 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 231 /* 232 * Only unblank the console if we are called in enabled 233 * context or a bust_spinlocks cleared the way for us. 234 */ 235 console_unblank(); 236 _machine_restart(command); 237 } 238 239 void machine_halt(void) 240 { 241 if (!in_interrupt() || oops_in_progress) 242 /* 243 * Only unblank the console if we are called in enabled 244 * context or a bust_spinlocks cleared the way for us. 245 */ 246 console_unblank(); 247 _machine_halt(); 248 } 249 250 void machine_power_off(void) 251 { 252 if (!in_interrupt() || oops_in_progress) 253 /* 254 * Only unblank the console if we are called in enabled 255 * context or a bust_spinlocks cleared the way for us. 256 */ 257 console_unblank(); 258 _machine_power_off(); 259 } 260 261 /* 262 * Dummy power off function. 263 */ 264 void (*pm_power_off)(void) = machine_power_off; 265 266 static int __init early_parse_mem(char *p) 267 { 268 memory_end = memparse(p, &p); 269 memory_end_set = 1; 270 return 0; 271 } 272 early_param("mem", early_parse_mem); 273 274 unsigned int user_mode = HOME_SPACE_MODE; 275 EXPORT_SYMBOL_GPL(user_mode); 276 277 static int set_amode_and_uaccess(unsigned long user_amode, 278 unsigned long user32_amode) 279 { 280 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode | 281 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 282 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 283 #ifdef CONFIG_COMPAT 284 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode | 285 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 286 PSW_MASK_PSTATE | PSW_DEFAULT_KEY; 287 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode | 288 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 289 PSW32_MASK_PSTATE; 290 #endif 291 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 292 PSW_MASK_MCHECK | PSW_DEFAULT_KEY; 293 294 if (MACHINE_HAS_MVCOS) { 295 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess)); 296 return 1; 297 } else { 298 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess)); 299 return 0; 300 } 301 } 302 303 /* 304 * Switch kernel/user addressing modes? 305 */ 306 static int __init early_parse_switch_amode(char *p) 307 { 308 if (user_mode != SECONDARY_SPACE_MODE) 309 user_mode = PRIMARY_SPACE_MODE; 310 return 0; 311 } 312 early_param("switch_amode", early_parse_switch_amode); 313 314 static int __init early_parse_user_mode(char *p) 315 { 316 if (p && strcmp(p, "primary") == 0) 317 user_mode = PRIMARY_SPACE_MODE; 318 #ifdef CONFIG_S390_EXEC_PROTECT 319 else if (p && strcmp(p, "secondary") == 0) 320 user_mode = SECONDARY_SPACE_MODE; 321 #endif 322 else if (!p || strcmp(p, "home") == 0) 323 user_mode = HOME_SPACE_MODE; 324 else 325 return 1; 326 return 0; 327 } 328 early_param("user_mode", early_parse_user_mode); 329 330 #ifdef CONFIG_S390_EXEC_PROTECT 331 /* 332 * Enable execute protection? 333 */ 334 static int __init early_parse_noexec(char *p) 335 { 336 if (!strncmp(p, "off", 3)) 337 return 0; 338 user_mode = SECONDARY_SPACE_MODE; 339 return 0; 340 } 341 early_param("noexec", early_parse_noexec); 342 #endif /* CONFIG_S390_EXEC_PROTECT */ 343 344 static void setup_addressing_mode(void) 345 { 346 if (user_mode == SECONDARY_SPACE_MODE) { 347 if (set_amode_and_uaccess(PSW_ASC_SECONDARY, 348 PSW32_ASC_SECONDARY)) 349 pr_info("Execute protection active, " 350 "mvcos available\n"); 351 else 352 pr_info("Execute protection active, " 353 "mvcos not available\n"); 354 } else if (user_mode == PRIMARY_SPACE_MODE) { 355 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY)) 356 pr_info("Address spaces switched, " 357 "mvcos available\n"); 358 else 359 pr_info("Address spaces switched, " 360 "mvcos not available\n"); 361 } 362 } 363 364 static void __init 365 setup_lowcore(void) 366 { 367 struct _lowcore *lc; 368 369 /* 370 * Setup lowcore for boot cpu 371 */ 372 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); 373 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 374 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 375 lc->restart_psw.addr = 376 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 377 if (user_mode != HOME_SPACE_MODE) 378 lc->restart_psw.mask |= PSW_ASC_HOME; 379 lc->external_new_psw.mask = psw_kernel_bits; 380 lc->external_new_psw.addr = 381 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 382 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 383 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 384 lc->program_new_psw.mask = psw_kernel_bits; 385 lc->program_new_psw.addr = 386 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 387 lc->mcck_new_psw.mask = 388 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 389 lc->mcck_new_psw.addr = 390 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 391 lc->io_new_psw.mask = psw_kernel_bits; 392 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 393 lc->clock_comparator = -1ULL; 394 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 395 lc->async_stack = (unsigned long) 396 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 397 lc->panic_stack = (unsigned long) 398 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 399 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 400 lc->thread_info = (unsigned long) &init_thread_union; 401 lc->machine_flags = S390_lowcore.machine_flags; 402 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 403 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 404 MAX_FACILITY_BIT/8); 405 #ifndef CONFIG_64BIT 406 if (MACHINE_HAS_IEEE) { 407 lc->extended_save_area_addr = (__u32) 408 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0); 409 /* enable extended save area */ 410 __ctl_set_bit(14, 29); 411 } 412 #else 413 lc->cmf_hpp = -1ULL; 414 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 415 #endif 416 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 417 lc->async_enter_timer = S390_lowcore.async_enter_timer; 418 lc->exit_timer = S390_lowcore.exit_timer; 419 lc->user_timer = S390_lowcore.user_timer; 420 lc->system_timer = S390_lowcore.system_timer; 421 lc->steal_timer = S390_lowcore.steal_timer; 422 lc->last_update_timer = S390_lowcore.last_update_timer; 423 lc->last_update_clock = S390_lowcore.last_update_clock; 424 lc->ftrace_func = S390_lowcore.ftrace_func; 425 set_prefix((u32)(unsigned long) lc); 426 lowcore_ptr[0] = lc; 427 } 428 429 static struct resource code_resource = { 430 .name = "Kernel code", 431 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 432 }; 433 434 static struct resource data_resource = { 435 .name = "Kernel data", 436 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 437 }; 438 439 static struct resource bss_resource = { 440 .name = "Kernel bss", 441 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 442 }; 443 444 static struct resource __initdata *standard_resources[] = { 445 &code_resource, 446 &data_resource, 447 &bss_resource, 448 }; 449 450 static void __init setup_resources(void) 451 { 452 struct resource *res, *std_res, *sub_res; 453 int i, j; 454 455 code_resource.start = (unsigned long) &_text; 456 code_resource.end = (unsigned long) &_etext - 1; 457 data_resource.start = (unsigned long) &_etext; 458 data_resource.end = (unsigned long) &_edata - 1; 459 bss_resource.start = (unsigned long) &__bss_start; 460 bss_resource.end = (unsigned long) &__bss_stop - 1; 461 462 for (i = 0; i < MEMORY_CHUNKS; i++) { 463 if (!memory_chunk[i].size) 464 continue; 465 res = alloc_bootmem_low(sizeof(*res)); 466 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 467 switch (memory_chunk[i].type) { 468 case CHUNK_READ_WRITE: 469 res->name = "System RAM"; 470 break; 471 case CHUNK_READ_ONLY: 472 res->name = "System ROM"; 473 res->flags |= IORESOURCE_READONLY; 474 break; 475 default: 476 res->name = "reserved"; 477 } 478 res->start = memory_chunk[i].addr; 479 res->end = res->start + memory_chunk[i].size - 1; 480 request_resource(&iomem_resource, res); 481 482 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 483 std_res = standard_resources[j]; 484 if (std_res->start < res->start || 485 std_res->start > res->end) 486 continue; 487 if (std_res->end > res->end) { 488 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 489 *sub_res = *std_res; 490 sub_res->end = res->end; 491 std_res->start = res->end + 1; 492 request_resource(res, sub_res); 493 } else { 494 request_resource(res, std_res); 495 } 496 } 497 } 498 } 499 500 unsigned long real_memory_size; 501 EXPORT_SYMBOL_GPL(real_memory_size); 502 503 static void __init setup_memory_end(void) 504 { 505 unsigned long memory_size; 506 unsigned long max_mem; 507 int i; 508 509 #ifdef CONFIG_ZFCPDUMP 510 if (ipl_info.type == IPL_TYPE_FCP_DUMP) { 511 memory_end = ZFCPDUMP_HSA_SIZE; 512 memory_end_set = 1; 513 } 514 #endif 515 memory_size = 0; 516 memory_end &= PAGE_MASK; 517 518 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 519 memory_end = min(max_mem, memory_end); 520 521 /* 522 * Make sure all chunks are MAX_ORDER aligned so we don't need the 523 * extra checks that HOLES_IN_ZONE would require. 524 */ 525 for (i = 0; i < MEMORY_CHUNKS; i++) { 526 unsigned long start, end; 527 struct mem_chunk *chunk; 528 unsigned long align; 529 530 chunk = &memory_chunk[i]; 531 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 532 start = (chunk->addr + align - 1) & ~(align - 1); 533 end = (chunk->addr + chunk->size) & ~(align - 1); 534 if (start >= end) 535 memset(chunk, 0, sizeof(*chunk)); 536 else { 537 chunk->addr = start; 538 chunk->size = end - start; 539 } 540 } 541 542 for (i = 0; i < MEMORY_CHUNKS; i++) { 543 struct mem_chunk *chunk = &memory_chunk[i]; 544 545 real_memory_size = max(real_memory_size, 546 chunk->addr + chunk->size); 547 if (chunk->addr >= max_mem) { 548 memset(chunk, 0, sizeof(*chunk)); 549 continue; 550 } 551 if (chunk->addr + chunk->size > max_mem) 552 chunk->size = max_mem - chunk->addr; 553 memory_size = max(memory_size, chunk->addr + chunk->size); 554 } 555 if (!memory_end) 556 memory_end = memory_size; 557 } 558 559 static void __init 560 setup_memory(void) 561 { 562 unsigned long bootmap_size; 563 unsigned long start_pfn, end_pfn; 564 int i; 565 566 /* 567 * partially used pages are not usable - thus 568 * we are rounding upwards: 569 */ 570 start_pfn = PFN_UP(__pa(&_end)); 571 end_pfn = max_pfn = PFN_DOWN(memory_end); 572 573 #ifdef CONFIG_BLK_DEV_INITRD 574 /* 575 * Move the initrd in case the bitmap of the bootmem allocater 576 * would overwrite it. 577 */ 578 579 if (INITRD_START && INITRD_SIZE) { 580 unsigned long bmap_size; 581 unsigned long start; 582 583 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 584 bmap_size = PFN_PHYS(bmap_size); 585 586 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 587 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 588 589 if (start + INITRD_SIZE > memory_end) { 590 pr_err("initrd extends beyond end of " 591 "memory (0x%08lx > 0x%08lx) " 592 "disabling initrd\n", 593 start + INITRD_SIZE, memory_end); 594 INITRD_START = INITRD_SIZE = 0; 595 } else { 596 pr_info("Moving initrd (0x%08lx -> " 597 "0x%08lx, size: %ld)\n", 598 INITRD_START, start, INITRD_SIZE); 599 memmove((void *) start, (void *) INITRD_START, 600 INITRD_SIZE); 601 INITRD_START = start; 602 } 603 } 604 } 605 #endif 606 607 /* 608 * Initialize the boot-time allocator 609 */ 610 bootmap_size = init_bootmem(start_pfn, end_pfn); 611 612 /* 613 * Register RAM areas with the bootmem allocator. 614 */ 615 616 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 617 unsigned long start_chunk, end_chunk, pfn; 618 619 if (memory_chunk[i].type != CHUNK_READ_WRITE) 620 continue; 621 start_chunk = PFN_DOWN(memory_chunk[i].addr); 622 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 623 end_chunk = min(end_chunk, end_pfn); 624 if (start_chunk >= end_chunk) 625 continue; 626 add_active_range(0, start_chunk, end_chunk); 627 pfn = max(start_chunk, start_pfn); 628 for (; pfn < end_chunk; pfn++) 629 page_set_storage_key(PFN_PHYS(pfn), 630 PAGE_DEFAULT_KEY, 0); 631 } 632 633 psw_set_key(PAGE_DEFAULT_KEY); 634 635 free_bootmem_with_active_regions(0, max_pfn); 636 637 /* 638 * Reserve memory used for lowcore/command line/kernel image. 639 */ 640 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 641 reserve_bootmem((unsigned long)_stext, 642 PFN_PHYS(start_pfn) - (unsigned long)_stext, 643 BOOTMEM_DEFAULT); 644 /* 645 * Reserve the bootmem bitmap itself as well. We do this in two 646 * steps (first step was init_bootmem()) because this catches 647 * the (very unlikely) case of us accidentally initializing the 648 * bootmem allocator with an invalid RAM area. 649 */ 650 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 651 BOOTMEM_DEFAULT); 652 653 #ifdef CONFIG_BLK_DEV_INITRD 654 if (INITRD_START && INITRD_SIZE) { 655 if (INITRD_START + INITRD_SIZE <= memory_end) { 656 reserve_bootmem(INITRD_START, INITRD_SIZE, 657 BOOTMEM_DEFAULT); 658 initrd_start = INITRD_START; 659 initrd_end = initrd_start + INITRD_SIZE; 660 } else { 661 pr_err("initrd extends beyond end of " 662 "memory (0x%08lx > 0x%08lx) " 663 "disabling initrd\n", 664 initrd_start + INITRD_SIZE, memory_end); 665 initrd_start = initrd_end = 0; 666 } 667 } 668 #endif 669 } 670 671 /* 672 * Setup hardware capabilities. 673 */ 674 static void __init setup_hwcaps(void) 675 { 676 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 677 struct cpuid cpu_id; 678 int i; 679 680 /* 681 * The store facility list bits numbers as found in the principles 682 * of operation are numbered with bit 1UL<<31 as number 0 to 683 * bit 1UL<<0 as number 31. 684 * Bit 0: instructions named N3, "backported" to esa-mode 685 * Bit 2: z/Architecture mode is active 686 * Bit 7: the store-facility-list-extended facility is installed 687 * Bit 17: the message-security assist is installed 688 * Bit 19: the long-displacement facility is installed 689 * Bit 21: the extended-immediate facility is installed 690 * Bit 22: extended-translation facility 3 is installed 691 * Bit 30: extended-translation facility 3 enhancement facility 692 * These get translated to: 693 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 694 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 695 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 696 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 697 */ 698 for (i = 0; i < 6; i++) 699 if (test_facility(stfl_bits[i])) 700 elf_hwcap |= 1UL << i; 701 702 if (test_facility(22) && test_facility(30)) 703 elf_hwcap |= HWCAP_S390_ETF3EH; 704 705 /* 706 * Check for additional facilities with store-facility-list-extended. 707 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 708 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 709 * as stored by stfl, bits 32-xxx contain additional facilities. 710 * How many facility words are stored depends on the number of 711 * doublewords passed to the instruction. The additional facilities 712 * are: 713 * Bit 42: decimal floating point facility is installed 714 * Bit 44: perform floating point operation facility is installed 715 * translated to: 716 * HWCAP_S390_DFP bit 6 (42 && 44). 717 */ 718 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 719 elf_hwcap |= HWCAP_S390_DFP; 720 721 /* 722 * Huge page support HWCAP_S390_HPAGE is bit 7. 723 */ 724 if (MACHINE_HAS_HPAGE) 725 elf_hwcap |= HWCAP_S390_HPAGE; 726 727 /* 728 * 64-bit register support for 31-bit processes 729 * HWCAP_S390_HIGH_GPRS is bit 9. 730 */ 731 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 732 733 get_cpu_id(&cpu_id); 734 switch (cpu_id.machine) { 735 case 0x9672: 736 #if !defined(CONFIG_64BIT) 737 default: /* Use "g5" as default for 31 bit kernels. */ 738 #endif 739 strcpy(elf_platform, "g5"); 740 break; 741 case 0x2064: 742 case 0x2066: 743 #if defined(CONFIG_64BIT) 744 default: /* Use "z900" as default for 64 bit kernels. */ 745 #endif 746 strcpy(elf_platform, "z900"); 747 break; 748 case 0x2084: 749 case 0x2086: 750 strcpy(elf_platform, "z990"); 751 break; 752 case 0x2094: 753 case 0x2096: 754 strcpy(elf_platform, "z9-109"); 755 break; 756 case 0x2097: 757 case 0x2098: 758 strcpy(elf_platform, "z10"); 759 break; 760 case 0x2817: 761 strcpy(elf_platform, "z196"); 762 break; 763 } 764 } 765 766 /* 767 * Setup function called from init/main.c just after the banner 768 * was printed. 769 */ 770 771 void __init 772 setup_arch(char **cmdline_p) 773 { 774 /* 775 * print what head.S has found out about the machine 776 */ 777 #ifndef CONFIG_64BIT 778 if (MACHINE_IS_VM) 779 pr_info("Linux is running as a z/VM " 780 "guest operating system in 31-bit mode\n"); 781 else if (MACHINE_IS_LPAR) 782 pr_info("Linux is running natively in 31-bit mode\n"); 783 if (MACHINE_HAS_IEEE) 784 pr_info("The hardware system has IEEE compatible " 785 "floating point units\n"); 786 else 787 pr_info("The hardware system has no IEEE compatible " 788 "floating point units\n"); 789 #else /* CONFIG_64BIT */ 790 if (MACHINE_IS_VM) 791 pr_info("Linux is running as a z/VM " 792 "guest operating system in 64-bit mode\n"); 793 else if (MACHINE_IS_KVM) 794 pr_info("Linux is running under KVM in 64-bit mode\n"); 795 else if (MACHINE_IS_LPAR) 796 pr_info("Linux is running natively in 64-bit mode\n"); 797 #endif /* CONFIG_64BIT */ 798 799 /* Have one command line that is parsed and saved in /proc/cmdline */ 800 /* boot_command_line has been already set up in early.c */ 801 *cmdline_p = boot_command_line; 802 803 ROOT_DEV = Root_RAM0; 804 805 init_mm.start_code = PAGE_OFFSET; 806 init_mm.end_code = (unsigned long) &_etext; 807 init_mm.end_data = (unsigned long) &_edata; 808 init_mm.brk = (unsigned long) &_end; 809 810 if (MACHINE_HAS_MVCOS) 811 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 812 else 813 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 814 815 parse_early_param(); 816 817 setup_ipl(); 818 setup_memory_end(); 819 setup_addressing_mode(); 820 setup_memory(); 821 setup_resources(); 822 setup_lowcore(); 823 824 cpu_init(); 825 s390_init_cpu_topology(); 826 827 /* 828 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 829 */ 830 setup_hwcaps(); 831 832 /* 833 * Create kernel page tables and switch to virtual addressing. 834 */ 835 paging_init(); 836 837 /* Setup default console */ 838 conmode_default(); 839 set_preferred_console(); 840 841 /* Setup zfcpdump support */ 842 setup_zfcpdump(console_devno); 843 } 844