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 user_mode = PRIMARY_SPACE_MODE; 309 return 0; 310 } 311 early_param("switch_amode", early_parse_switch_amode); 312 313 static int __init early_parse_user_mode(char *p) 314 { 315 if (p && strcmp(p, "primary") == 0) 316 user_mode = PRIMARY_SPACE_MODE; 317 else if (!p || strcmp(p, "home") == 0) 318 user_mode = HOME_SPACE_MODE; 319 else 320 return 1; 321 return 0; 322 } 323 early_param("user_mode", early_parse_user_mode); 324 325 static void setup_addressing_mode(void) 326 { 327 if (user_mode == PRIMARY_SPACE_MODE) { 328 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY)) 329 pr_info("Address spaces switched, " 330 "mvcos available\n"); 331 else 332 pr_info("Address spaces switched, " 333 "mvcos not available\n"); 334 } 335 } 336 337 static void __init 338 setup_lowcore(void) 339 { 340 struct _lowcore *lc; 341 342 /* 343 * Setup lowcore for boot cpu 344 */ 345 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096); 346 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); 347 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 348 lc->restart_psw.addr = 349 PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler; 350 if (user_mode != HOME_SPACE_MODE) 351 lc->restart_psw.mask |= PSW_ASC_HOME; 352 lc->external_new_psw.mask = psw_kernel_bits; 353 lc->external_new_psw.addr = 354 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 355 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT; 356 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 357 lc->program_new_psw.mask = psw_kernel_bits; 358 lc->program_new_psw.addr = 359 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 360 lc->mcck_new_psw.mask = 361 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT; 362 lc->mcck_new_psw.addr = 363 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 364 lc->io_new_psw.mask = psw_kernel_bits; 365 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 366 lc->clock_comparator = -1ULL; 367 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 368 lc->async_stack = (unsigned long) 369 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 370 lc->panic_stack = (unsigned long) 371 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 372 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 373 lc->thread_info = (unsigned long) &init_thread_union; 374 lc->machine_flags = S390_lowcore.machine_flags; 375 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 376 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 377 MAX_FACILITY_BIT/8); 378 #ifndef CONFIG_64BIT 379 if (MACHINE_HAS_IEEE) { 380 lc->extended_save_area_addr = (__u32) 381 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0); 382 /* enable extended save area */ 383 __ctl_set_bit(14, 29); 384 } 385 #else 386 lc->cmf_hpp = -1ULL; 387 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; 388 #endif 389 lc->sync_enter_timer = S390_lowcore.sync_enter_timer; 390 lc->async_enter_timer = S390_lowcore.async_enter_timer; 391 lc->exit_timer = S390_lowcore.exit_timer; 392 lc->user_timer = S390_lowcore.user_timer; 393 lc->system_timer = S390_lowcore.system_timer; 394 lc->steal_timer = S390_lowcore.steal_timer; 395 lc->last_update_timer = S390_lowcore.last_update_timer; 396 lc->last_update_clock = S390_lowcore.last_update_clock; 397 lc->ftrace_func = S390_lowcore.ftrace_func; 398 set_prefix((u32)(unsigned long) lc); 399 lowcore_ptr[0] = lc; 400 } 401 402 static struct resource code_resource = { 403 .name = "Kernel code", 404 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 405 }; 406 407 static struct resource data_resource = { 408 .name = "Kernel data", 409 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 410 }; 411 412 static struct resource bss_resource = { 413 .name = "Kernel bss", 414 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 415 }; 416 417 static struct resource __initdata *standard_resources[] = { 418 &code_resource, 419 &data_resource, 420 &bss_resource, 421 }; 422 423 static void __init setup_resources(void) 424 { 425 struct resource *res, *std_res, *sub_res; 426 int i, j; 427 428 code_resource.start = (unsigned long) &_text; 429 code_resource.end = (unsigned long) &_etext - 1; 430 data_resource.start = (unsigned long) &_etext; 431 data_resource.end = (unsigned long) &_edata - 1; 432 bss_resource.start = (unsigned long) &__bss_start; 433 bss_resource.end = (unsigned long) &__bss_stop - 1; 434 435 for (i = 0; i < MEMORY_CHUNKS; i++) { 436 if (!memory_chunk[i].size) 437 continue; 438 res = alloc_bootmem_low(sizeof(*res)); 439 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 440 switch (memory_chunk[i].type) { 441 case CHUNK_READ_WRITE: 442 res->name = "System RAM"; 443 break; 444 case CHUNK_READ_ONLY: 445 res->name = "System ROM"; 446 res->flags |= IORESOURCE_READONLY; 447 break; 448 default: 449 res->name = "reserved"; 450 } 451 res->start = memory_chunk[i].addr; 452 res->end = res->start + memory_chunk[i].size - 1; 453 request_resource(&iomem_resource, res); 454 455 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 456 std_res = standard_resources[j]; 457 if (std_res->start < res->start || 458 std_res->start > res->end) 459 continue; 460 if (std_res->end > res->end) { 461 sub_res = alloc_bootmem_low(sizeof(*sub_res)); 462 *sub_res = *std_res; 463 sub_res->end = res->end; 464 std_res->start = res->end + 1; 465 request_resource(res, sub_res); 466 } else { 467 request_resource(res, std_res); 468 } 469 } 470 } 471 } 472 473 unsigned long real_memory_size; 474 EXPORT_SYMBOL_GPL(real_memory_size); 475 476 static void __init setup_memory_end(void) 477 { 478 unsigned long memory_size; 479 unsigned long max_mem; 480 int i; 481 482 #ifdef CONFIG_ZFCPDUMP 483 if (ipl_info.type == IPL_TYPE_FCP_DUMP) { 484 memory_end = ZFCPDUMP_HSA_SIZE; 485 memory_end_set = 1; 486 } 487 #endif 488 memory_size = 0; 489 memory_end &= PAGE_MASK; 490 491 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS; 492 memory_end = min(max_mem, memory_end); 493 494 /* 495 * Make sure all chunks are MAX_ORDER aligned so we don't need the 496 * extra checks that HOLES_IN_ZONE would require. 497 */ 498 for (i = 0; i < MEMORY_CHUNKS; i++) { 499 unsigned long start, end; 500 struct mem_chunk *chunk; 501 unsigned long align; 502 503 chunk = &memory_chunk[i]; 504 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1); 505 start = (chunk->addr + align - 1) & ~(align - 1); 506 end = (chunk->addr + chunk->size) & ~(align - 1); 507 if (start >= end) 508 memset(chunk, 0, sizeof(*chunk)); 509 else { 510 chunk->addr = start; 511 chunk->size = end - start; 512 } 513 } 514 515 for (i = 0; i < MEMORY_CHUNKS; i++) { 516 struct mem_chunk *chunk = &memory_chunk[i]; 517 518 real_memory_size = max(real_memory_size, 519 chunk->addr + chunk->size); 520 if (chunk->addr >= max_mem) { 521 memset(chunk, 0, sizeof(*chunk)); 522 continue; 523 } 524 if (chunk->addr + chunk->size > max_mem) 525 chunk->size = max_mem - chunk->addr; 526 memory_size = max(memory_size, chunk->addr + chunk->size); 527 } 528 if (!memory_end) 529 memory_end = memory_size; 530 } 531 532 void *restart_stack __attribute__((__section__(".data"))); 533 534 /* 535 * Setup new PSW and allocate stack for PSW restart interrupt 536 */ 537 static void __init setup_restart_psw(void) 538 { 539 psw_t psw; 540 541 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); 542 restart_stack += ASYNC_SIZE; 543 544 /* 545 * Setup restart PSW for absolute zero lowcore. This is necesary 546 * if PSW restart is done on an offline CPU that has lowcore zero 547 */ 548 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 549 psw.addr = PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler; 550 copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw)); 551 } 552 553 static void __init 554 setup_memory(void) 555 { 556 unsigned long bootmap_size; 557 unsigned long start_pfn, end_pfn; 558 int i; 559 560 /* 561 * partially used pages are not usable - thus 562 * we are rounding upwards: 563 */ 564 start_pfn = PFN_UP(__pa(&_end)); 565 end_pfn = max_pfn = PFN_DOWN(memory_end); 566 567 #ifdef CONFIG_BLK_DEV_INITRD 568 /* 569 * Move the initrd in case the bitmap of the bootmem allocater 570 * would overwrite it. 571 */ 572 573 if (INITRD_START && INITRD_SIZE) { 574 unsigned long bmap_size; 575 unsigned long start; 576 577 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1); 578 bmap_size = PFN_PHYS(bmap_size); 579 580 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) { 581 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE; 582 583 if (start + INITRD_SIZE > memory_end) { 584 pr_err("initrd extends beyond end of " 585 "memory (0x%08lx > 0x%08lx) " 586 "disabling initrd\n", 587 start + INITRD_SIZE, memory_end); 588 INITRD_START = INITRD_SIZE = 0; 589 } else { 590 pr_info("Moving initrd (0x%08lx -> " 591 "0x%08lx, size: %ld)\n", 592 INITRD_START, start, INITRD_SIZE); 593 memmove((void *) start, (void *) INITRD_START, 594 INITRD_SIZE); 595 INITRD_START = start; 596 } 597 } 598 } 599 #endif 600 601 /* 602 * Initialize the boot-time allocator 603 */ 604 bootmap_size = init_bootmem(start_pfn, end_pfn); 605 606 /* 607 * Register RAM areas with the bootmem allocator. 608 */ 609 610 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) { 611 unsigned long start_chunk, end_chunk, pfn; 612 613 if (memory_chunk[i].type != CHUNK_READ_WRITE) 614 continue; 615 start_chunk = PFN_DOWN(memory_chunk[i].addr); 616 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size); 617 end_chunk = min(end_chunk, end_pfn); 618 if (start_chunk >= end_chunk) 619 continue; 620 add_active_range(0, start_chunk, end_chunk); 621 pfn = max(start_chunk, start_pfn); 622 for (; pfn < end_chunk; pfn++) 623 page_set_storage_key(PFN_PHYS(pfn), 624 PAGE_DEFAULT_KEY, 0); 625 } 626 627 psw_set_key(PAGE_DEFAULT_KEY); 628 629 free_bootmem_with_active_regions(0, max_pfn); 630 631 /* 632 * Reserve memory used for lowcore/command line/kernel image. 633 */ 634 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT); 635 reserve_bootmem((unsigned long)_stext, 636 PFN_PHYS(start_pfn) - (unsigned long)_stext, 637 BOOTMEM_DEFAULT); 638 /* 639 * Reserve the bootmem bitmap itself as well. We do this in two 640 * steps (first step was init_bootmem()) because this catches 641 * the (very unlikely) case of us accidentally initializing the 642 * bootmem allocator with an invalid RAM area. 643 */ 644 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size, 645 BOOTMEM_DEFAULT); 646 647 #ifdef CONFIG_BLK_DEV_INITRD 648 if (INITRD_START && INITRD_SIZE) { 649 if (INITRD_START + INITRD_SIZE <= memory_end) { 650 reserve_bootmem(INITRD_START, INITRD_SIZE, 651 BOOTMEM_DEFAULT); 652 initrd_start = INITRD_START; 653 initrd_end = initrd_start + INITRD_SIZE; 654 } else { 655 pr_err("initrd extends beyond end of " 656 "memory (0x%08lx > 0x%08lx) " 657 "disabling initrd\n", 658 initrd_start + INITRD_SIZE, memory_end); 659 initrd_start = initrd_end = 0; 660 } 661 } 662 #endif 663 } 664 665 /* 666 * Setup hardware capabilities. 667 */ 668 static void __init setup_hwcaps(void) 669 { 670 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 671 struct cpuid cpu_id; 672 int i; 673 674 /* 675 * The store facility list bits numbers as found in the principles 676 * of operation are numbered with bit 1UL<<31 as number 0 to 677 * bit 1UL<<0 as number 31. 678 * Bit 0: instructions named N3, "backported" to esa-mode 679 * Bit 2: z/Architecture mode is active 680 * Bit 7: the store-facility-list-extended facility is installed 681 * Bit 17: the message-security assist is installed 682 * Bit 19: the long-displacement facility is installed 683 * Bit 21: the extended-immediate facility is installed 684 * Bit 22: extended-translation facility 3 is installed 685 * Bit 30: extended-translation facility 3 enhancement facility 686 * These get translated to: 687 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 688 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 689 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 690 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 691 */ 692 for (i = 0; i < 6; i++) 693 if (test_facility(stfl_bits[i])) 694 elf_hwcap |= 1UL << i; 695 696 if (test_facility(22) && test_facility(30)) 697 elf_hwcap |= HWCAP_S390_ETF3EH; 698 699 /* 700 * Check for additional facilities with store-facility-list-extended. 701 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 702 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 703 * as stored by stfl, bits 32-xxx contain additional facilities. 704 * How many facility words are stored depends on the number of 705 * doublewords passed to the instruction. The additional facilities 706 * are: 707 * Bit 42: decimal floating point facility is installed 708 * Bit 44: perform floating point operation facility is installed 709 * translated to: 710 * HWCAP_S390_DFP bit 6 (42 && 44). 711 */ 712 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 713 elf_hwcap |= HWCAP_S390_DFP; 714 715 /* 716 * Huge page support HWCAP_S390_HPAGE is bit 7. 717 */ 718 if (MACHINE_HAS_HPAGE) 719 elf_hwcap |= HWCAP_S390_HPAGE; 720 721 /* 722 * 64-bit register support for 31-bit processes 723 * HWCAP_S390_HIGH_GPRS is bit 9. 724 */ 725 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 726 727 get_cpu_id(&cpu_id); 728 switch (cpu_id.machine) { 729 case 0x9672: 730 #if !defined(CONFIG_64BIT) 731 default: /* Use "g5" as default for 31 bit kernels. */ 732 #endif 733 strcpy(elf_platform, "g5"); 734 break; 735 case 0x2064: 736 case 0x2066: 737 #if defined(CONFIG_64BIT) 738 default: /* Use "z900" as default for 64 bit kernels. */ 739 #endif 740 strcpy(elf_platform, "z900"); 741 break; 742 case 0x2084: 743 case 0x2086: 744 strcpy(elf_platform, "z990"); 745 break; 746 case 0x2094: 747 case 0x2096: 748 strcpy(elf_platform, "z9-109"); 749 break; 750 case 0x2097: 751 case 0x2098: 752 strcpy(elf_platform, "z10"); 753 break; 754 case 0x2817: 755 case 0x2818: 756 strcpy(elf_platform, "z196"); 757 break; 758 } 759 } 760 761 /* 762 * Setup function called from init/main.c just after the banner 763 * was printed. 764 */ 765 766 void __init 767 setup_arch(char **cmdline_p) 768 { 769 /* 770 * print what head.S has found out about the machine 771 */ 772 #ifndef CONFIG_64BIT 773 if (MACHINE_IS_VM) 774 pr_info("Linux is running as a z/VM " 775 "guest operating system in 31-bit mode\n"); 776 else if (MACHINE_IS_LPAR) 777 pr_info("Linux is running natively in 31-bit mode\n"); 778 if (MACHINE_HAS_IEEE) 779 pr_info("The hardware system has IEEE compatible " 780 "floating point units\n"); 781 else 782 pr_info("The hardware system has no IEEE compatible " 783 "floating point units\n"); 784 #else /* CONFIG_64BIT */ 785 if (MACHINE_IS_VM) 786 pr_info("Linux is running as a z/VM " 787 "guest operating system in 64-bit mode\n"); 788 else if (MACHINE_IS_KVM) 789 pr_info("Linux is running under KVM in 64-bit mode\n"); 790 else if (MACHINE_IS_LPAR) 791 pr_info("Linux is running natively in 64-bit mode\n"); 792 #endif /* CONFIG_64BIT */ 793 794 /* Have one command line that is parsed and saved in /proc/cmdline */ 795 /* boot_command_line has been already set up in early.c */ 796 *cmdline_p = boot_command_line; 797 798 ROOT_DEV = Root_RAM0; 799 800 init_mm.start_code = PAGE_OFFSET; 801 init_mm.end_code = (unsigned long) &_etext; 802 init_mm.end_data = (unsigned long) &_edata; 803 init_mm.brk = (unsigned long) &_end; 804 805 if (MACHINE_HAS_MVCOS) 806 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); 807 else 808 memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); 809 810 parse_early_param(); 811 812 setup_ipl(); 813 setup_memory_end(); 814 setup_addressing_mode(); 815 setup_memory(); 816 setup_resources(); 817 setup_restart_psw(); 818 setup_lowcore(); 819 820 cpu_init(); 821 s390_init_cpu_topology(); 822 823 /* 824 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM). 825 */ 826 setup_hwcaps(); 827 828 /* 829 * Create kernel page tables and switch to virtual addressing. 830 */ 831 paging_init(); 832 833 /* Setup default console */ 834 conmode_default(); 835 set_preferred_console(); 836 837 /* Setup zfcpdump support */ 838 setup_zfcpdump(console_devno); 839 } 840