1 /* 2 * arch/s390/kernel/setup.c 3 * 4 * S390 version 5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 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 #include <linux/errno.h> 18 #include <linux/module.h> 19 #include <linux/sched.h> 20 #include <linux/kernel.h> 21 #include <linux/mm.h> 22 #include <linux/stddef.h> 23 #include <linux/unistd.h> 24 #include <linux/ptrace.h> 25 #include <linux/slab.h> 26 #include <linux/user.h> 27 #include <linux/a.out.h> 28 #include <linux/tty.h> 29 #include <linux/ioport.h> 30 #include <linux/delay.h> 31 #include <linux/config.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/seq_file.h> 38 #include <linux/kernel_stat.h> 39 40 #include <asm/uaccess.h> 41 #include <asm/system.h> 42 #include <asm/smp.h> 43 #include <asm/mmu_context.h> 44 #include <asm/cpcmd.h> 45 #include <asm/lowcore.h> 46 #include <asm/irq.h> 47 48 /* 49 * Machine setup.. 50 */ 51 unsigned int console_mode = 0; 52 unsigned int console_devno = -1; 53 unsigned int console_irq = -1; 54 unsigned long memory_size = 0; 55 unsigned long machine_flags = 0; 56 unsigned int default_storage_key = 0; 57 struct { 58 unsigned long addr, size, type; 59 } memory_chunk[MEMORY_CHUNKS] = { { 0 } }; 60 #define CHUNK_READ_WRITE 0 61 #define CHUNK_READ_ONLY 1 62 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */ 63 64 /* 65 * Setup options 66 */ 67 extern int _text,_etext, _edata, _end; 68 69 /* 70 * This is set up by the setup-routine at boot-time 71 * for S390 need to find out, what we have to setup 72 * using address 0x10400 ... 73 */ 74 75 #include <asm/setup.h> 76 77 static char command_line[COMMAND_LINE_SIZE] = { 0, }; 78 79 static struct resource code_resource = { 80 .name = "Kernel code", 81 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 82 }; 83 84 static struct resource data_resource = { 85 .name = "Kernel data", 86 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 87 }; 88 89 /* 90 * cpu_init() initializes state that is per-CPU. 91 */ 92 void __devinit cpu_init (void) 93 { 94 int addr = hard_smp_processor_id(); 95 96 /* 97 * Store processor id in lowcore (used e.g. in timer_interrupt) 98 */ 99 asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id)); 100 S390_lowcore.cpu_data.cpu_addr = addr; 101 102 /* 103 * Force FPU initialization: 104 */ 105 clear_thread_flag(TIF_USEDFPU); 106 clear_used_math(); 107 108 atomic_inc(&init_mm.mm_count); 109 current->active_mm = &init_mm; 110 if (current->mm) 111 BUG(); 112 enter_lazy_tlb(&init_mm, current); 113 } 114 115 /* 116 * VM halt and poweroff setup routines 117 */ 118 char vmhalt_cmd[128] = ""; 119 char vmpoff_cmd[128] = ""; 120 121 static inline void strncpy_skip_quote(char *dst, char *src, int n) 122 { 123 int sx, dx; 124 125 dx = 0; 126 for (sx = 0; src[sx] != 0; sx++) { 127 if (src[sx] == '"') continue; 128 dst[dx++] = src[sx]; 129 if (dx >= n) break; 130 } 131 } 132 133 static int __init vmhalt_setup(char *str) 134 { 135 strncpy_skip_quote(vmhalt_cmd, str, 127); 136 vmhalt_cmd[127] = 0; 137 return 1; 138 } 139 140 __setup("vmhalt=", vmhalt_setup); 141 142 static int __init vmpoff_setup(char *str) 143 { 144 strncpy_skip_quote(vmpoff_cmd, str, 127); 145 vmpoff_cmd[127] = 0; 146 return 1; 147 } 148 149 __setup("vmpoff=", vmpoff_setup); 150 151 /* 152 * condev= and conmode= setup parameter. 153 */ 154 155 static int __init condev_setup(char *str) 156 { 157 int vdev; 158 159 vdev = simple_strtoul(str, &str, 0); 160 if (vdev >= 0 && vdev < 65536) { 161 console_devno = vdev; 162 console_irq = -1; 163 } 164 return 1; 165 } 166 167 __setup("condev=", condev_setup); 168 169 static int __init conmode_setup(char *str) 170 { 171 #if defined(CONFIG_SCLP_CONSOLE) 172 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0) 173 SET_CONSOLE_SCLP; 174 #endif 175 #if defined(CONFIG_TN3215_CONSOLE) 176 if (strncmp(str, "3215", 5) == 0) 177 SET_CONSOLE_3215; 178 #endif 179 #if defined(CONFIG_TN3270_CONSOLE) 180 if (strncmp(str, "3270", 5) == 0) 181 SET_CONSOLE_3270; 182 #endif 183 return 1; 184 } 185 186 __setup("conmode=", conmode_setup); 187 188 static void __init conmode_default(void) 189 { 190 char query_buffer[1024]; 191 char *ptr; 192 193 if (MACHINE_IS_VM) { 194 __cpcmd("QUERY CONSOLE", query_buffer, 1024); 195 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 196 ptr = strstr(query_buffer, "SUBCHANNEL ="); 197 console_irq = simple_strtoul(ptr + 13, NULL, 16); 198 __cpcmd("QUERY TERM", query_buffer, 1024); 199 ptr = strstr(query_buffer, "CONMODE"); 200 /* 201 * Set the conmode to 3215 so that the device recognition 202 * will set the cu_type of the console to 3215. If the 203 * conmode is 3270 and we don't set it back then both 204 * 3215 and the 3270 driver will try to access the console 205 * device (3215 as console and 3270 as normal tty). 206 */ 207 __cpcmd("TERM CONMODE 3215", NULL, 0); 208 if (ptr == NULL) { 209 #if defined(CONFIG_SCLP_CONSOLE) 210 SET_CONSOLE_SCLP; 211 #endif 212 return; 213 } 214 if (strncmp(ptr + 8, "3270", 4) == 0) { 215 #if defined(CONFIG_TN3270_CONSOLE) 216 SET_CONSOLE_3270; 217 #elif defined(CONFIG_TN3215_CONSOLE) 218 SET_CONSOLE_3215; 219 #elif defined(CONFIG_SCLP_CONSOLE) 220 SET_CONSOLE_SCLP; 221 #endif 222 } else if (strncmp(ptr + 8, "3215", 4) == 0) { 223 #if defined(CONFIG_TN3215_CONSOLE) 224 SET_CONSOLE_3215; 225 #elif defined(CONFIG_TN3270_CONSOLE) 226 SET_CONSOLE_3270; 227 #elif defined(CONFIG_SCLP_CONSOLE) 228 SET_CONSOLE_SCLP; 229 #endif 230 } 231 } else if (MACHINE_IS_P390) { 232 #if defined(CONFIG_TN3215_CONSOLE) 233 SET_CONSOLE_3215; 234 #elif defined(CONFIG_TN3270_CONSOLE) 235 SET_CONSOLE_3270; 236 #endif 237 } else { 238 #if defined(CONFIG_SCLP_CONSOLE) 239 SET_CONSOLE_SCLP; 240 #endif 241 } 242 } 243 244 #ifdef CONFIG_SMP 245 extern void machine_restart_smp(char *); 246 extern void machine_halt_smp(void); 247 extern void machine_power_off_smp(void); 248 249 void (*_machine_restart)(char *command) = machine_restart_smp; 250 void (*_machine_halt)(void) = machine_halt_smp; 251 void (*_machine_power_off)(void) = machine_power_off_smp; 252 #else 253 /* 254 * Reboot, halt and power_off routines for non SMP. 255 */ 256 extern void reipl(unsigned long devno); 257 static void do_machine_restart_nonsmp(char * __unused) 258 { 259 if (MACHINE_IS_VM) 260 cpcmd ("IPL", NULL, 0); 261 else 262 reipl (0x10000 | S390_lowcore.ipl_device); 263 } 264 265 static void do_machine_halt_nonsmp(void) 266 { 267 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) 268 cpcmd(vmhalt_cmd, NULL, 0); 269 signal_processor(smp_processor_id(), sigp_stop_and_store_status); 270 } 271 272 static void do_machine_power_off_nonsmp(void) 273 { 274 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) 275 cpcmd(vmpoff_cmd, NULL, 0); 276 signal_processor(smp_processor_id(), sigp_stop_and_store_status); 277 } 278 279 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp; 280 void (*_machine_halt)(void) = do_machine_halt_nonsmp; 281 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp; 282 #endif 283 284 /* 285 * Reboot, halt and power_off stubs. They just call _machine_restart, 286 * _machine_halt or _machine_power_off. 287 */ 288 289 void machine_restart(char *command) 290 { 291 console_unblank(); 292 _machine_restart(command); 293 } 294 295 EXPORT_SYMBOL(machine_restart); 296 297 void machine_halt(void) 298 { 299 console_unblank(); 300 _machine_halt(); 301 } 302 303 EXPORT_SYMBOL(machine_halt); 304 305 void machine_power_off(void) 306 { 307 console_unblank(); 308 _machine_power_off(); 309 } 310 311 EXPORT_SYMBOL(machine_power_off); 312 313 /* 314 * Setup function called from init/main.c just after the banner 315 * was printed. 316 */ 317 extern char _pstart, _pend, _stext; 318 319 void __init setup_arch(char **cmdline_p) 320 { 321 unsigned long bootmap_size; 322 unsigned long memory_start, memory_end; 323 char c = ' ', cn, *to = command_line, *from = COMMAND_LINE; 324 unsigned long start_pfn, end_pfn; 325 static unsigned int smptrap=0; 326 unsigned long delay = 0; 327 struct _lowcore *lc; 328 int i; 329 330 if (smptrap) 331 return; 332 smptrap=1; 333 334 /* 335 * print what head.S has found out about the machine 336 */ 337 #ifndef CONFIG_ARCH_S390X 338 printk((MACHINE_IS_VM) ? 339 "We are running under VM (31 bit mode)\n" : 340 "We are running native (31 bit mode)\n"); 341 printk((MACHINE_HAS_IEEE) ? 342 "This machine has an IEEE fpu\n" : 343 "This machine has no IEEE fpu\n"); 344 #else /* CONFIG_ARCH_S390X */ 345 printk((MACHINE_IS_VM) ? 346 "We are running under VM (64 bit mode)\n" : 347 "We are running native (64 bit mode)\n"); 348 #endif /* CONFIG_ARCH_S390X */ 349 350 ROOT_DEV = Root_RAM0; 351 memory_start = (unsigned long) &_end; /* fixit if use $CODELO etc*/ 352 #ifndef CONFIG_ARCH_S390X 353 memory_end = memory_size & ~0x400000UL; /* align memory end to 4MB */ 354 /* 355 * We need some free virtual space to be able to do vmalloc. 356 * On a machine with 2GB memory we make sure that we have at 357 * least 128 MB free space for vmalloc. 358 */ 359 if (memory_end > 1920*1024*1024) 360 memory_end = 1920*1024*1024; 361 #else /* CONFIG_ARCH_S390X */ 362 memory_end = memory_size & ~0x200000UL; /* detected in head.s */ 363 #endif /* CONFIG_ARCH_S390X */ 364 init_mm.start_code = PAGE_OFFSET; 365 init_mm.end_code = (unsigned long) &_etext; 366 init_mm.end_data = (unsigned long) &_edata; 367 init_mm.brk = (unsigned long) &_end; 368 369 code_resource.start = (unsigned long) &_text; 370 code_resource.end = (unsigned long) &_etext - 1; 371 data_resource.start = (unsigned long) &_etext; 372 data_resource.end = (unsigned long) &_edata - 1; 373 374 /* Save unparsed command line copy for /proc/cmdline */ 375 memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE); 376 saved_command_line[COMMAND_LINE_SIZE-1] = '\0'; 377 378 for (;;) { 379 /* 380 * "mem=XXX[kKmM]" sets memsize 381 */ 382 if (c == ' ' && strncmp(from, "mem=", 4) == 0) { 383 memory_end = simple_strtoul(from+4, &from, 0); 384 if ( *from == 'K' || *from == 'k' ) { 385 memory_end = memory_end << 10; 386 from++; 387 } else if ( *from == 'M' || *from == 'm' ) { 388 memory_end = memory_end << 20; 389 from++; 390 } 391 } 392 /* 393 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes 394 */ 395 if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) { 396 delay = simple_strtoul(from+9, &from, 0); 397 if (*from == 's' || *from == 'S') { 398 delay = delay*1000000; 399 from++; 400 } else if (*from == 'm' || *from == 'M') { 401 delay = delay*60*1000000; 402 from++; 403 } 404 /* now wait for the requested amount of time */ 405 udelay(delay); 406 } 407 cn = *(from++); 408 if (!cn) 409 break; 410 if (cn == '\n') 411 cn = ' '; /* replace newlines with space */ 412 if (cn == 0x0d) 413 cn = ' '; /* replace 0x0d with space */ 414 if (cn == ' ' && c == ' ') 415 continue; /* remove additional spaces */ 416 c = cn; 417 if (to - command_line >= COMMAND_LINE_SIZE) 418 break; 419 *(to++) = c; 420 } 421 if (c == ' ' && to > command_line) to--; 422 *to = '\0'; 423 *cmdline_p = command_line; 424 425 /* 426 * partially used pages are not usable - thus 427 * we are rounding upwards: 428 */ 429 start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT; 430 end_pfn = max_pfn = memory_end >> PAGE_SHIFT; 431 432 /* 433 * Initialize the boot-time allocator (with low memory only): 434 */ 435 bootmap_size = init_bootmem(start_pfn, end_pfn); 436 437 /* 438 * Register RAM areas with the bootmem allocator. 439 */ 440 for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) { 441 unsigned long start_chunk, end_chunk; 442 443 if (memory_chunk[i].type != CHUNK_READ_WRITE) 444 continue; 445 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1); 446 start_chunk >>= PAGE_SHIFT; 447 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size); 448 end_chunk >>= PAGE_SHIFT; 449 if (start_chunk < start_pfn) 450 start_chunk = start_pfn; 451 if (end_chunk > end_pfn) 452 end_chunk = end_pfn; 453 if (start_chunk < end_chunk) 454 free_bootmem(start_chunk << PAGE_SHIFT, 455 (end_chunk - start_chunk) << PAGE_SHIFT); 456 } 457 458 /* 459 * Reserve the bootmem bitmap itself as well. We do this in two 460 * steps (first step was init_bootmem()) because this catches 461 * the (very unlikely) case of us accidentally initializing the 462 * bootmem allocator with an invalid RAM area. 463 */ 464 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size); 465 466 #ifdef CONFIG_BLK_DEV_INITRD 467 if (INITRD_START) { 468 if (INITRD_START + INITRD_SIZE <= memory_end) { 469 reserve_bootmem(INITRD_START, INITRD_SIZE); 470 initrd_start = INITRD_START; 471 initrd_end = initrd_start + INITRD_SIZE; 472 } else { 473 printk("initrd extends beyond end of memory " 474 "(0x%08lx > 0x%08lx)\ndisabling initrd\n", 475 initrd_start + INITRD_SIZE, memory_end); 476 initrd_start = initrd_end = 0; 477 } 478 } 479 #endif 480 481 for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) { 482 struct resource *res; 483 484 res = alloc_bootmem_low(sizeof(struct resource)); 485 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM; 486 487 switch (memory_chunk[i].type) { 488 case CHUNK_READ_WRITE: 489 res->name = "System RAM"; 490 break; 491 case CHUNK_READ_ONLY: 492 res->name = "System ROM"; 493 res->flags |= IORESOURCE_READONLY; 494 break; 495 default: 496 res->name = "reserved"; 497 } 498 res->start = memory_chunk[i].addr; 499 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1; 500 request_resource(&iomem_resource, res); 501 request_resource(res, &code_resource); 502 request_resource(res, &data_resource); 503 } 504 505 /* 506 * Setup lowcore for boot cpu 507 */ 508 #ifndef CONFIG_ARCH_S390X 509 lc = (struct _lowcore *) __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0); 510 memset(lc, 0, PAGE_SIZE); 511 #else /* CONFIG_ARCH_S390X */ 512 lc = (struct _lowcore *) __alloc_bootmem(2*PAGE_SIZE, 2*PAGE_SIZE, 0); 513 memset(lc, 0, 2*PAGE_SIZE); 514 #endif /* CONFIG_ARCH_S390X */ 515 lc->restart_psw.mask = PSW_BASE_BITS; 516 lc->restart_psw.addr = 517 PSW_ADDR_AMODE | (unsigned long) restart_int_handler; 518 lc->external_new_psw.mask = PSW_KERNEL_BITS; 519 lc->external_new_psw.addr = 520 PSW_ADDR_AMODE | (unsigned long) ext_int_handler; 521 lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT; 522 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call; 523 lc->program_new_psw.mask = PSW_KERNEL_BITS; 524 lc->program_new_psw.addr = 525 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler; 526 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 527 lc->mcck_new_psw.addr = 528 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler; 529 lc->io_new_psw.mask = PSW_KERNEL_BITS; 530 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler; 531 lc->ipl_device = S390_lowcore.ipl_device; 532 lc->jiffy_timer = -1LL; 533 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE; 534 lc->async_stack = (unsigned long) 535 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE; 536 #ifdef CONFIG_CHECK_STACK 537 lc->panic_stack = (unsigned long) 538 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE; 539 #endif 540 lc->current_task = (unsigned long) init_thread_union.thread_info.task; 541 lc->thread_info = (unsigned long) &init_thread_union; 542 #ifdef CONFIG_ARCH_S390X 543 if (MACHINE_HAS_DIAG44) 544 lc->diag44_opcode = 0x83000044; 545 else 546 lc->diag44_opcode = 0x07000700; 547 #endif /* CONFIG_ARCH_S390X */ 548 set_prefix((u32)(unsigned long) lc); 549 cpu_init(); 550 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr; 551 552 /* 553 * Create kernel page tables and switch to virtual addressing. 554 */ 555 paging_init(); 556 557 /* Setup default console */ 558 conmode_default(); 559 } 560 561 void print_cpu_info(struct cpuinfo_S390 *cpuinfo) 562 { 563 printk("cpu %d " 564 #ifdef CONFIG_SMP 565 "phys_idx=%d " 566 #endif 567 "vers=%02X ident=%06X machine=%04X unused=%04X\n", 568 cpuinfo->cpu_nr, 569 #ifdef CONFIG_SMP 570 cpuinfo->cpu_addr, 571 #endif 572 cpuinfo->cpu_id.version, 573 cpuinfo->cpu_id.ident, 574 cpuinfo->cpu_id.machine, 575 cpuinfo->cpu_id.unused); 576 } 577 578 /* 579 * show_cpuinfo - Get information on one CPU for use by procfs. 580 */ 581 582 static int show_cpuinfo(struct seq_file *m, void *v) 583 { 584 struct cpuinfo_S390 *cpuinfo; 585 unsigned long n = (unsigned long) v - 1; 586 587 if (!n) { 588 seq_printf(m, "vendor_id : IBM/S390\n" 589 "# processors : %i\n" 590 "bogomips per cpu: %lu.%02lu\n", 591 num_online_cpus(), loops_per_jiffy/(500000/HZ), 592 (loops_per_jiffy/(5000/HZ))%100); 593 } 594 if (cpu_online(n)) { 595 #ifdef CONFIG_SMP 596 if (smp_processor_id() == n) 597 cpuinfo = &S390_lowcore.cpu_data; 598 else 599 cpuinfo = &lowcore_ptr[n]->cpu_data; 600 #else 601 cpuinfo = &S390_lowcore.cpu_data; 602 #endif 603 seq_printf(m, "processor %li: " 604 "version = %02X, " 605 "identification = %06X, " 606 "machine = %04X\n", 607 n, cpuinfo->cpu_id.version, 608 cpuinfo->cpu_id.ident, 609 cpuinfo->cpu_id.machine); 610 } 611 return 0; 612 } 613 614 static void *c_start(struct seq_file *m, loff_t *pos) 615 { 616 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL; 617 } 618 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 619 { 620 ++*pos; 621 return c_start(m, pos); 622 } 623 static void c_stop(struct seq_file *m, void *v) 624 { 625 } 626 struct seq_operations cpuinfo_op = { 627 .start = c_start, 628 .next = c_next, 629 .stop = c_stop, 630 .show = show_cpuinfo, 631 }; 632 633