1 /* 2 * Copyright IBM Corp. 2007, 2009 3 * Author(s): Hongjie Yang <hongjie@us.ibm.com>, 4 * Heiko Carstens <heiko.carstens@de.ibm.com> 5 */ 6 7 #define KMSG_COMPONENT "setup" 8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 9 10 #include <linux/compiler.h> 11 #include <linux/init.h> 12 #include <linux/errno.h> 13 #include <linux/string.h> 14 #include <linux/ctype.h> 15 #include <linux/lockdep.h> 16 #include <linux/extable.h> 17 #include <linux/pfn.h> 18 #include <linux/uaccess.h> 19 #include <linux/kernel.h> 20 #include <asm/diag.h> 21 #include <asm/ebcdic.h> 22 #include <asm/ipl.h> 23 #include <asm/lowcore.h> 24 #include <asm/processor.h> 25 #include <asm/sections.h> 26 #include <asm/setup.h> 27 #include <asm/sysinfo.h> 28 #include <asm/cpcmd.h> 29 #include <asm/sclp.h> 30 #include <asm/facility.h> 31 #include "entry.h" 32 33 /* 34 * Create a Kernel NSS if the SAVESYS= parameter is defined 35 */ 36 #define DEFSYS_CMD_SIZE 128 37 #define SAVESYS_CMD_SIZE 32 38 39 char kernel_nss_name[NSS_NAME_SIZE + 1]; 40 41 static void __init setup_boot_command_line(void); 42 43 /* 44 * Get the TOD clock running. 45 */ 46 static void __init reset_tod_clock(void) 47 { 48 u64 time; 49 50 if (store_tod_clock(&time) == 0) 51 return; 52 /* TOD clock not running. Set the clock to Unix Epoch. */ 53 if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0) 54 disabled_wait(0); 55 56 sched_clock_base_cc = TOD_UNIX_EPOCH; 57 S390_lowcore.last_update_clock = sched_clock_base_cc; 58 } 59 60 #ifdef CONFIG_SHARED_KERNEL 61 int __init savesys_ipl_nss(char *cmd, const int cmdlen); 62 63 asm( 64 " .section .init.text,\"ax\",@progbits\n" 65 " .align 4\n" 66 " .type savesys_ipl_nss, @function\n" 67 "savesys_ipl_nss:\n" 68 " stmg 6,15,48(15)\n" 69 " lgr 14,3\n" 70 " sam31\n" 71 " diag 2,14,0x8\n" 72 " sam64\n" 73 " lgr 2,14\n" 74 " lmg 6,15,48(15)\n" 75 " br 14\n" 76 " .size savesys_ipl_nss, .-savesys_ipl_nss\n" 77 " .previous\n"); 78 79 static __initdata char upper_command_line[COMMAND_LINE_SIZE]; 80 81 static noinline __init void create_kernel_nss(void) 82 { 83 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; 84 #ifdef CONFIG_BLK_DEV_INITRD 85 unsigned int sinitrd_pfn, einitrd_pfn; 86 #endif 87 int response; 88 int hlen; 89 size_t len; 90 char *savesys_ptr; 91 char defsys_cmd[DEFSYS_CMD_SIZE]; 92 char savesys_cmd[SAVESYS_CMD_SIZE]; 93 94 /* Do nothing if we are not running under VM */ 95 if (!MACHINE_IS_VM) 96 return; 97 98 /* Convert COMMAND_LINE to upper case */ 99 for (i = 0; i < strlen(boot_command_line); i++) 100 upper_command_line[i] = toupper(boot_command_line[i]); 101 102 savesys_ptr = strstr(upper_command_line, "SAVESYS="); 103 104 if (!savesys_ptr) 105 return; 106 107 savesys_ptr += 8; /* Point to the beginning of the NSS name */ 108 for (i = 0; i < NSS_NAME_SIZE; i++) { 109 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') 110 break; 111 kernel_nss_name[i] = savesys_ptr[i]; 112 } 113 114 stext_pfn = PFN_DOWN(__pa(&_stext)); 115 eshared_pfn = PFN_DOWN(__pa(&_eshared)); 116 end_pfn = PFN_UP(__pa(&_end)); 117 min_size = end_pfn << 2; 118 119 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE, 120 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", 121 kernel_nss_name, stext_pfn - 1, stext_pfn, 122 eshared_pfn - 1, eshared_pfn, end_pfn); 123 124 #ifdef CONFIG_BLK_DEV_INITRD 125 if (INITRD_START && INITRD_SIZE) { 126 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); 127 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); 128 min_size = einitrd_pfn << 2; 129 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 130 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn); 131 } 132 #endif 133 134 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 135 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size); 136 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0'; 137 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s", 138 kernel_nss_name, kernel_nss_name); 139 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0'; 140 141 __cpcmd(defsys_cmd, NULL, 0, &response); 142 143 if (response != 0) { 144 pr_err("Defining the Linux kernel NSS failed with rc=%d\n", 145 response); 146 kernel_nss_name[0] = '\0'; 147 return; 148 } 149 150 len = strlen(savesys_cmd); 151 ASCEBC(savesys_cmd, len); 152 response = savesys_ipl_nss(savesys_cmd, len); 153 154 /* On success: response is equal to the command size, 155 * max SAVESYS_CMD_SIZE 156 * On error: response contains the numeric portion of cp error message. 157 * for SAVESYS it will be >= 263 158 * for missing privilege class, it will be 1 159 */ 160 if (response > SAVESYS_CMD_SIZE || response == 1) { 161 pr_err("Saving the Linux kernel NSS failed with rc=%d\n", 162 response); 163 kernel_nss_name[0] = '\0'; 164 return; 165 } 166 167 /* re-initialize cputime accounting. */ 168 sched_clock_base_cc = get_tod_clock(); 169 S390_lowcore.last_update_clock = sched_clock_base_cc; 170 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL; 171 S390_lowcore.user_timer = 0; 172 S390_lowcore.system_timer = 0; 173 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer)); 174 175 /* re-setup boot command line with new ipl vm parms */ 176 ipl_update_parameters(); 177 setup_boot_command_line(); 178 179 ipl_flags = IPL_NSS_VALID; 180 } 181 182 #else /* CONFIG_SHARED_KERNEL */ 183 184 static inline void create_kernel_nss(void) { } 185 186 #endif /* CONFIG_SHARED_KERNEL */ 187 188 /* 189 * Clear bss memory 190 */ 191 static noinline __init void clear_bss_section(void) 192 { 193 memset(__bss_start, 0, __bss_stop - __bss_start); 194 } 195 196 /* 197 * Initialize storage key for kernel pages 198 */ 199 static noinline __init void init_kernel_storage_key(void) 200 { 201 #if PAGE_DEFAULT_KEY 202 unsigned long end_pfn, init_pfn; 203 204 end_pfn = PFN_UP(__pa(&_end)); 205 206 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 207 page_set_storage_key(init_pfn << PAGE_SHIFT, 208 PAGE_DEFAULT_KEY, 0); 209 #endif 210 } 211 212 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 213 214 static noinline __init void detect_machine_type(void) 215 { 216 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; 217 218 /* Check current-configuration-level */ 219 if (stsi(NULL, 0, 0, 0) <= 2) { 220 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 221 return; 222 } 223 /* Get virtual-machine cpu information. */ 224 if (stsi(vmms, 3, 2, 2) || !vmms->count) 225 return; 226 227 /* Running under KVM? If not we assume z/VM */ 228 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) 229 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 230 else 231 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 232 } 233 234 /* Remove leading, trailing and double whitespace. */ 235 static inline void strim_all(char *str) 236 { 237 char *s; 238 239 s = strim(str); 240 if (s != str) 241 memmove(str, s, strlen(s)); 242 while (*str) { 243 if (!isspace(*str++)) 244 continue; 245 if (isspace(*str)) { 246 s = skip_spaces(str); 247 memmove(str, s, strlen(s) + 1); 248 } 249 } 250 } 251 252 static noinline __init void setup_arch_string(void) 253 { 254 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; 255 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; 256 char mstr[80], hvstr[17]; 257 258 if (stsi(mach, 1, 1, 1)) 259 return; 260 EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); 261 EBCASC(mach->type, sizeof(mach->type)); 262 EBCASC(mach->model, sizeof(mach->model)); 263 EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); 264 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", 265 mach->manufacturer, mach->type, 266 mach->model, mach->model_capacity); 267 strim_all(mstr); 268 if (stsi(vm, 3, 2, 2) == 0 && vm->count) { 269 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); 270 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); 271 strim_all(hvstr); 272 } else { 273 sprintf(hvstr, "%s", 274 MACHINE_IS_LPAR ? "LPAR" : 275 MACHINE_IS_VM ? "z/VM" : 276 MACHINE_IS_KVM ? "KVM" : "unknown"); 277 } 278 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); 279 } 280 281 static __init void setup_topology(void) 282 { 283 int max_mnest; 284 285 if (!test_facility(11)) 286 return; 287 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 288 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 289 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 290 break; 291 } 292 topology_max_mnest = max_mnest; 293 } 294 295 static void early_pgm_check_handler(void) 296 { 297 const struct exception_table_entry *fixup; 298 unsigned long cr0, cr0_new; 299 unsigned long addr; 300 301 addr = S390_lowcore.program_old_psw.addr; 302 fixup = search_exception_tables(addr); 303 if (!fixup) 304 disabled_wait(0); 305 /* Disable low address protection before storing into lowcore. */ 306 __ctl_store(cr0, 0, 0); 307 cr0_new = cr0 & ~(1UL << 28); 308 __ctl_load(cr0_new, 0, 0); 309 S390_lowcore.program_old_psw.addr = extable_fixup(fixup); 310 __ctl_load(cr0, 0, 0); 311 } 312 313 static noinline __init void setup_lowcore_early(void) 314 { 315 psw_t psw; 316 317 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; 318 psw.addr = (unsigned long) s390_base_ext_handler; 319 S390_lowcore.external_new_psw = psw; 320 psw.addr = (unsigned long) s390_base_pgm_handler; 321 S390_lowcore.program_new_psw = psw; 322 s390_base_pgm_handler_fn = early_pgm_check_handler; 323 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT; 324 } 325 326 static noinline __init void setup_facility_list(void) 327 { 328 stfle(S390_lowcore.stfle_fac_list, 329 ARRAY_SIZE(S390_lowcore.stfle_fac_list)); 330 } 331 332 static __init void detect_diag9c(void) 333 { 334 unsigned int cpu_address; 335 int rc; 336 337 cpu_address = stap(); 338 diag_stat_inc(DIAG_STAT_X09C); 339 asm volatile( 340 " diag %2,0,0x9c\n" 341 "0: la %0,0\n" 342 "1:\n" 343 EX_TABLE(0b,1b) 344 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 345 if (!rc) 346 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 347 } 348 349 static __init void detect_diag44(void) 350 { 351 int rc; 352 353 diag_stat_inc(DIAG_STAT_X044); 354 asm volatile( 355 " diag 0,0,0x44\n" 356 "0: la %0,0\n" 357 "1:\n" 358 EX_TABLE(0b,1b) 359 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 360 if (!rc) 361 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 362 } 363 364 static __init void detect_machine_facilities(void) 365 { 366 if (test_facility(8)) { 367 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; 368 __ctl_set_bit(0, 23); 369 } 370 if (test_facility(78)) 371 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; 372 if (test_facility(3)) 373 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 374 if (test_facility(40)) 375 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP; 376 if (test_facility(50) && test_facility(73)) 377 S390_lowcore.machine_flags |= MACHINE_FLAG_TE; 378 if (test_facility(51)) 379 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC; 380 if (test_facility(129)) { 381 S390_lowcore.machine_flags |= MACHINE_FLAG_VX; 382 __ctl_set_bit(0, 17); 383 } 384 if (test_facility(130)) { 385 S390_lowcore.machine_flags |= MACHINE_FLAG_NX; 386 __ctl_set_bit(0, 20); 387 } 388 if (test_facility(133)) 389 S390_lowcore.machine_flags |= MACHINE_FLAG_GS; 390 } 391 392 static inline void save_vector_registers(void) 393 { 394 #ifdef CONFIG_CRASH_DUMP 395 if (test_facility(129)) 396 save_vx_regs(boot_cpu_vector_save_area); 397 #endif 398 } 399 400 static int __init topology_setup(char *str) 401 { 402 bool enabled; 403 int rc; 404 405 rc = kstrtobool(str, &enabled); 406 if (!rc && !enabled) 407 S390_lowcore.machine_flags &= ~MACHINE_FLAG_TOPOLOGY; 408 return rc; 409 } 410 early_param("topology", topology_setup); 411 412 static int __init disable_vector_extension(char *str) 413 { 414 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX; 415 __ctl_clear_bit(0, 17); 416 return 1; 417 } 418 early_param("novx", disable_vector_extension); 419 420 static int __init noexec_setup(char *str) 421 { 422 bool enabled; 423 int rc; 424 425 rc = kstrtobool(str, &enabled); 426 if (!rc && !enabled) { 427 /* Disable no-execute support */ 428 S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX; 429 __ctl_clear_bit(0, 20); 430 } 431 return rc; 432 } 433 early_param("noexec", noexec_setup); 434 435 static int __init cad_setup(char *str) 436 { 437 bool enabled; 438 int rc; 439 440 rc = kstrtobool(str, &enabled); 441 if (!rc && enabled && test_facility(128)) 442 /* Enable problem state CAD. */ 443 __ctl_set_bit(2, 3); 444 return rc; 445 } 446 early_param("cad", cad_setup); 447 448 static __init void memmove_early(void *dst, const void *src, size_t n) 449 { 450 unsigned long addr; 451 long incr; 452 psw_t old; 453 454 if (!n) 455 return; 456 incr = 1; 457 if (dst > src) { 458 incr = -incr; 459 dst += n - 1; 460 src += n - 1; 461 } 462 old = S390_lowcore.program_new_psw; 463 S390_lowcore.program_new_psw.mask = __extract_psw(); 464 asm volatile( 465 " larl %[addr],1f\n" 466 " stg %[addr],%[psw_pgm_addr]\n" 467 "0: mvc 0(1,%[dst]),0(%[src])\n" 468 " agr %[dst],%[incr]\n" 469 " agr %[src],%[incr]\n" 470 " brctg %[n],0b\n" 471 "1:\n" 472 : [addr] "=&d" (addr), 473 [psw_pgm_addr] "=Q" (S390_lowcore.program_new_psw.addr), 474 [dst] "+&a" (dst), [src] "+&a" (src), [n] "+d" (n) 475 : [incr] "d" (incr) 476 : "cc", "memory"); 477 S390_lowcore.program_new_psw = old; 478 } 479 480 static __init noinline void ipl_save_parameters(void) 481 { 482 void *src, *dst; 483 484 src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr; 485 dst = (void *) IPL_PARMBLOCK_ORIGIN; 486 memmove_early(dst, src, PAGE_SIZE); 487 S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN; 488 } 489 490 static __init noinline void rescue_initrd(void) 491 { 492 #ifdef CONFIG_BLK_DEV_INITRD 493 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20); 494 /* 495 * Just like in case of IPL from VM reader we make sure there is a 496 * gap of 4MB between end of kernel and start of initrd. 497 * That way we can also be sure that saving an NSS will succeed, 498 * which however only requires different segments. 499 */ 500 if (!INITRD_START || !INITRD_SIZE) 501 return; 502 if (INITRD_START >= min_initrd_addr) 503 return; 504 memmove_early((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE); 505 INITRD_START = min_initrd_addr; 506 #endif 507 } 508 509 /* Set up boot command line */ 510 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 511 { 512 char *parm, *delim; 513 size_t rc, len; 514 515 len = strlen(boot_command_line); 516 517 delim = boot_command_line + len; /* '\0' character position */ 518 parm = boot_command_line + len + 1; /* append right after '\0' */ 519 520 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 521 if (rc) { 522 if (*parm == '=') 523 memmove(boot_command_line, parm + 1, rc); 524 else 525 *delim = ' '; /* replace '\0' with space */ 526 } 527 } 528 529 static inline int has_ebcdic_char(const char *str) 530 { 531 int i; 532 533 for (i = 0; str[i]; i++) 534 if (str[i] & 0x80) 535 return 1; 536 return 0; 537 } 538 539 static void __init setup_boot_command_line(void) 540 { 541 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; 542 /* convert arch command line to ascii if necessary */ 543 if (has_ebcdic_char(COMMAND_LINE)) 544 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 545 /* copy arch command line */ 546 strlcpy(boot_command_line, strstrip(COMMAND_LINE), 547 ARCH_COMMAND_LINE_SIZE); 548 549 /* append IPL PARM data to the boot command line */ 550 if (MACHINE_IS_VM) 551 append_to_cmdline(append_ipl_vmparm); 552 553 append_to_cmdline(append_ipl_scpdata); 554 } 555 556 /* 557 * Save ipl parameters, clear bss memory, initialize storage keys 558 * and create a kernel NSS at startup if the SAVESYS= parm is defined 559 */ 560 void __init startup_init(void) 561 { 562 reset_tod_clock(); 563 ipl_save_parameters(); 564 rescue_initrd(); 565 clear_bss_section(); 566 ipl_verify_parameters(); 567 time_early_init(); 568 init_kernel_storage_key(); 569 lockdep_off(); 570 setup_lowcore_early(); 571 setup_facility_list(); 572 detect_machine_type(); 573 setup_arch_string(); 574 ipl_update_parameters(); 575 setup_boot_command_line(); 576 create_kernel_nss(); 577 detect_diag9c(); 578 detect_diag44(); 579 detect_machine_facilities(); 580 save_vector_registers(); 581 setup_topology(); 582 sclp_early_detect(); 583 lockdep_on(); 584 } 585