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/ftrace.h> 16 #include <linux/lockdep.h> 17 #include <linux/module.h> 18 #include <linux/pfn.h> 19 #include <linux/uaccess.h> 20 #include <linux/kernel.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 #ifdef CONFIG_64BIT 69 " stmg 6,15,48(15)\n" 70 " lgr 14,3\n" 71 " sam31\n" 72 " diag 2,14,0x8\n" 73 " sam64\n" 74 " lgr 2,14\n" 75 " lmg 6,15,48(15)\n" 76 #else 77 " stm 6,15,24(15)\n" 78 " lr 14,3\n" 79 " diag 2,14,0x8\n" 80 " lr 2,14\n" 81 " lm 6,15,24(15)\n" 82 #endif 83 " br 14\n" 84 " .size savesys_ipl_nss, .-savesys_ipl_nss\n" 85 " .previous\n"); 86 87 static __initdata char upper_command_line[COMMAND_LINE_SIZE]; 88 89 static noinline __init void create_kernel_nss(void) 90 { 91 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; 92 #ifdef CONFIG_BLK_DEV_INITRD 93 unsigned int sinitrd_pfn, einitrd_pfn; 94 #endif 95 int response; 96 int hlen; 97 size_t len; 98 char *savesys_ptr; 99 char defsys_cmd[DEFSYS_CMD_SIZE]; 100 char savesys_cmd[SAVESYS_CMD_SIZE]; 101 102 /* Do nothing if we are not running under VM */ 103 if (!MACHINE_IS_VM) 104 return; 105 106 /* Convert COMMAND_LINE to upper case */ 107 for (i = 0; i < strlen(boot_command_line); i++) 108 upper_command_line[i] = toupper(boot_command_line[i]); 109 110 savesys_ptr = strstr(upper_command_line, "SAVESYS="); 111 112 if (!savesys_ptr) 113 return; 114 115 savesys_ptr += 8; /* Point to the beginning of the NSS name */ 116 for (i = 0; i < NSS_NAME_SIZE; i++) { 117 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') 118 break; 119 kernel_nss_name[i] = savesys_ptr[i]; 120 } 121 122 stext_pfn = PFN_DOWN(__pa(&_stext)); 123 eshared_pfn = PFN_DOWN(__pa(&_eshared)); 124 end_pfn = PFN_UP(__pa(&_end)); 125 min_size = end_pfn << 2; 126 127 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE, 128 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", 129 kernel_nss_name, stext_pfn - 1, stext_pfn, 130 eshared_pfn - 1, eshared_pfn, end_pfn); 131 132 #ifdef CONFIG_BLK_DEV_INITRD 133 if (INITRD_START && INITRD_SIZE) { 134 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); 135 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); 136 min_size = einitrd_pfn << 2; 137 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 138 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn); 139 } 140 #endif 141 142 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 143 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size); 144 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0'; 145 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s", 146 kernel_nss_name, kernel_nss_name); 147 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0'; 148 149 __cpcmd(defsys_cmd, NULL, 0, &response); 150 151 if (response != 0) { 152 pr_err("Defining the Linux kernel NSS failed with rc=%d\n", 153 response); 154 kernel_nss_name[0] = '\0'; 155 return; 156 } 157 158 len = strlen(savesys_cmd); 159 ASCEBC(savesys_cmd, len); 160 response = savesys_ipl_nss(savesys_cmd, len); 161 162 /* On success: response is equal to the command size, 163 * max SAVESYS_CMD_SIZE 164 * On error: response contains the numeric portion of cp error message. 165 * for SAVESYS it will be >= 263 166 * for missing privilege class, it will be 1 167 */ 168 if (response > SAVESYS_CMD_SIZE || response == 1) { 169 pr_err("Saving the Linux kernel NSS failed with rc=%d\n", 170 response); 171 kernel_nss_name[0] = '\0'; 172 return; 173 } 174 175 /* re-initialize cputime accounting. */ 176 sched_clock_base_cc = get_tod_clock(); 177 S390_lowcore.last_update_clock = sched_clock_base_cc; 178 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL; 179 S390_lowcore.user_timer = 0; 180 S390_lowcore.system_timer = 0; 181 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer)); 182 183 /* re-setup boot command line with new ipl vm parms */ 184 ipl_update_parameters(); 185 setup_boot_command_line(); 186 187 ipl_flags = IPL_NSS_VALID; 188 } 189 190 #else /* CONFIG_SHARED_KERNEL */ 191 192 static inline void create_kernel_nss(void) { } 193 194 #endif /* CONFIG_SHARED_KERNEL */ 195 196 /* 197 * Clear bss memory 198 */ 199 static noinline __init void clear_bss_section(void) 200 { 201 memset(__bss_start, 0, __bss_stop - __bss_start); 202 } 203 204 /* 205 * Initialize storage key for kernel pages 206 */ 207 static noinline __init void init_kernel_storage_key(void) 208 { 209 #if PAGE_DEFAULT_KEY 210 unsigned long end_pfn, init_pfn; 211 212 end_pfn = PFN_UP(__pa(&_end)); 213 214 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 215 page_set_storage_key(init_pfn << PAGE_SHIFT, 216 PAGE_DEFAULT_KEY, 0); 217 #endif 218 } 219 220 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 221 222 static noinline __init void detect_machine_type(void) 223 { 224 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; 225 226 /* Check current-configuration-level */ 227 if (stsi(NULL, 0, 0, 0) <= 2) { 228 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 229 return; 230 } 231 /* Get virtual-machine cpu information. */ 232 if (stsi(vmms, 3, 2, 2) || !vmms->count) 233 return; 234 235 /* Running under KVM? If not we assume z/VM */ 236 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) 237 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 238 else 239 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 240 } 241 242 static __init void setup_topology(void) 243 { 244 #ifdef CONFIG_64BIT 245 int max_mnest; 246 247 if (!test_facility(11)) 248 return; 249 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 250 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 251 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 252 break; 253 } 254 topology_max_mnest = max_mnest; 255 #endif 256 } 257 258 static void early_pgm_check_handler(void) 259 { 260 const struct exception_table_entry *fixup; 261 unsigned long addr; 262 263 addr = S390_lowcore.program_old_psw.addr; 264 fixup = search_exception_tables(addr & PSW_ADDR_INSN); 265 if (!fixup) 266 disabled_wait(0); 267 S390_lowcore.program_old_psw.addr = extable_fixup(fixup)|PSW_ADDR_AMODE; 268 } 269 270 static noinline __init void setup_lowcore_early(void) 271 { 272 psw_t psw; 273 274 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; 275 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 276 S390_lowcore.external_new_psw = psw; 277 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 278 S390_lowcore.program_new_psw = psw; 279 s390_base_pgm_handler_fn = early_pgm_check_handler; 280 } 281 282 static noinline __init void setup_facility_list(void) 283 { 284 stfle(S390_lowcore.stfle_fac_list, 285 ARRAY_SIZE(S390_lowcore.stfle_fac_list)); 286 } 287 288 static __init void detect_mvpg(void) 289 { 290 #ifndef CONFIG_64BIT 291 int rc; 292 293 asm volatile( 294 " la 0,0\n" 295 " mvpg %2,%2\n" 296 "0: la %0,0\n" 297 "1:\n" 298 EX_TABLE(0b,1b) 299 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 300 if (!rc) 301 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; 302 #endif 303 } 304 305 static __init void detect_ieee(void) 306 { 307 #ifndef CONFIG_64BIT 308 int rc, tmp; 309 310 asm volatile( 311 " efpc %1,0\n" 312 "0: la %0,0\n" 313 "1:\n" 314 EX_TABLE(0b,1b) 315 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 316 if (!rc) 317 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; 318 #endif 319 } 320 321 static __init void detect_csp(void) 322 { 323 #ifndef CONFIG_64BIT 324 int rc; 325 326 asm volatile( 327 " la 0,0\n" 328 " la 1,0\n" 329 " la 2,4\n" 330 " csp 0,2\n" 331 "0: la %0,0\n" 332 "1:\n" 333 EX_TABLE(0b,1b) 334 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 335 if (!rc) 336 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; 337 #endif 338 } 339 340 static __init void detect_diag9c(void) 341 { 342 unsigned int cpu_address; 343 int rc; 344 345 cpu_address = stap(); 346 asm volatile( 347 " diag %2,0,0x9c\n" 348 "0: la %0,0\n" 349 "1:\n" 350 EX_TABLE(0b,1b) 351 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 352 if (!rc) 353 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 354 } 355 356 static __init void detect_diag44(void) 357 { 358 #ifdef CONFIG_64BIT 359 int rc; 360 361 asm volatile( 362 " diag 0,0,0x44\n" 363 "0: la %0,0\n" 364 "1:\n" 365 EX_TABLE(0b,1b) 366 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 367 if (!rc) 368 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 369 #endif 370 } 371 372 static __init void detect_machine_facilities(void) 373 { 374 #ifdef CONFIG_64BIT 375 if (test_facility(8)) { 376 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; 377 __ctl_set_bit(0, 23); 378 } 379 if (test_facility(78)) 380 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; 381 if (test_facility(3)) 382 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 383 if (test_facility(27)) 384 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; 385 if (test_facility(40)) 386 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP; 387 if (test_facility(50) && test_facility(73)) 388 S390_lowcore.machine_flags |= MACHINE_FLAG_TE; 389 if (test_facility(66)) 390 S390_lowcore.machine_flags |= MACHINE_FLAG_RRBM; 391 #endif 392 } 393 394 static __init void rescue_initrd(void) 395 { 396 #ifdef CONFIG_BLK_DEV_INITRD 397 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20); 398 /* 399 * Just like in case of IPL from VM reader we make sure there is a 400 * gap of 4MB between end of kernel and start of initrd. 401 * That way we can also be sure that saving an NSS will succeed, 402 * which however only requires different segments. 403 */ 404 if (!INITRD_START || !INITRD_SIZE) 405 return; 406 if (INITRD_START >= min_initrd_addr) 407 return; 408 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE); 409 INITRD_START = min_initrd_addr; 410 #endif 411 } 412 413 /* Set up boot command line */ 414 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 415 { 416 char *parm, *delim; 417 size_t rc, len; 418 419 len = strlen(boot_command_line); 420 421 delim = boot_command_line + len; /* '\0' character position */ 422 parm = boot_command_line + len + 1; /* append right after '\0' */ 423 424 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 425 if (rc) { 426 if (*parm == '=') 427 memmove(boot_command_line, parm + 1, rc); 428 else 429 *delim = ' '; /* replace '\0' with space */ 430 } 431 } 432 433 static inline int has_ebcdic_char(const char *str) 434 { 435 int i; 436 437 for (i = 0; str[i]; i++) 438 if (str[i] & 0x80) 439 return 1; 440 return 0; 441 } 442 443 static void __init setup_boot_command_line(void) 444 { 445 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; 446 /* convert arch command line to ascii if necessary */ 447 if (has_ebcdic_char(COMMAND_LINE)) 448 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 449 /* copy arch command line */ 450 strlcpy(boot_command_line, strstrip(COMMAND_LINE), 451 ARCH_COMMAND_LINE_SIZE); 452 453 /* append IPL PARM data to the boot command line */ 454 if (MACHINE_IS_VM) 455 append_to_cmdline(append_ipl_vmparm); 456 457 append_to_cmdline(append_ipl_scpdata); 458 } 459 460 /* 461 * Save ipl parameters, clear bss memory, initialize storage keys 462 * and create a kernel NSS at startup if the SAVESYS= parm is defined 463 */ 464 void __init startup_init(void) 465 { 466 reset_tod_clock(); 467 ipl_save_parameters(); 468 rescue_initrd(); 469 clear_bss_section(); 470 init_kernel_storage_key(); 471 lockdep_init(); 472 lockdep_off(); 473 setup_lowcore_early(); 474 setup_facility_list(); 475 detect_machine_type(); 476 ipl_update_parameters(); 477 setup_boot_command_line(); 478 create_kernel_nss(); 479 detect_mvpg(); 480 detect_ieee(); 481 detect_csp(); 482 detect_diag9c(); 483 detect_diag44(); 484 detect_machine_facilities(); 485 setup_topology(); 486 sclp_early_detect(); 487 #ifdef CONFIG_DYNAMIC_FTRACE 488 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; 489 #endif 490 lockdep_on(); 491 } 492