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 cr0, cr0_new; 262 unsigned long addr; 263 264 addr = S390_lowcore.program_old_psw.addr; 265 fixup = search_exception_tables(addr & PSW_ADDR_INSN); 266 if (!fixup) 267 disabled_wait(0); 268 /* Disable low address protection before storing into lowcore. */ 269 __ctl_store(cr0, 0, 0); 270 cr0_new = cr0 & ~(1UL << 28); 271 __ctl_load(cr0_new, 0, 0); 272 S390_lowcore.program_old_psw.addr = extable_fixup(fixup)|PSW_ADDR_AMODE; 273 __ctl_load(cr0, 0, 0); 274 } 275 276 static noinline __init void setup_lowcore_early(void) 277 { 278 psw_t psw; 279 280 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; 281 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 282 S390_lowcore.external_new_psw = psw; 283 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 284 S390_lowcore.program_new_psw = psw; 285 s390_base_pgm_handler_fn = early_pgm_check_handler; 286 } 287 288 static noinline __init void setup_facility_list(void) 289 { 290 stfle(S390_lowcore.stfle_fac_list, 291 ARRAY_SIZE(S390_lowcore.stfle_fac_list)); 292 } 293 294 static __init void detect_mvpg(void) 295 { 296 #ifndef CONFIG_64BIT 297 int rc; 298 299 asm volatile( 300 " la 0,0\n" 301 " mvpg %2,%2\n" 302 "0: la %0,0\n" 303 "1:\n" 304 EX_TABLE(0b,1b) 305 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 306 if (!rc) 307 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; 308 #endif 309 } 310 311 static __init void detect_ieee(void) 312 { 313 #ifndef CONFIG_64BIT 314 int rc, tmp; 315 316 asm volatile( 317 " efpc %1,0\n" 318 "0: la %0,0\n" 319 "1:\n" 320 EX_TABLE(0b,1b) 321 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 322 if (!rc) 323 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; 324 #endif 325 } 326 327 static __init void detect_csp(void) 328 { 329 #ifndef CONFIG_64BIT 330 int rc; 331 332 asm volatile( 333 " la 0,0\n" 334 " la 1,0\n" 335 " la 2,4\n" 336 " csp 0,2\n" 337 "0: la %0,0\n" 338 "1:\n" 339 EX_TABLE(0b,1b) 340 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 341 if (!rc) 342 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; 343 #endif 344 } 345 346 static __init void detect_diag9c(void) 347 { 348 unsigned int cpu_address; 349 int rc; 350 351 cpu_address = stap(); 352 asm volatile( 353 " diag %2,0,0x9c\n" 354 "0: la %0,0\n" 355 "1:\n" 356 EX_TABLE(0b,1b) 357 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 358 if (!rc) 359 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 360 } 361 362 static __init void detect_diag44(void) 363 { 364 #ifdef CONFIG_64BIT 365 int rc; 366 367 asm volatile( 368 " diag 0,0,0x44\n" 369 "0: la %0,0\n" 370 "1:\n" 371 EX_TABLE(0b,1b) 372 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 373 if (!rc) 374 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 375 #endif 376 } 377 378 static __init void detect_machine_facilities(void) 379 { 380 #ifdef CONFIG_64BIT 381 if (test_facility(8)) { 382 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; 383 __ctl_set_bit(0, 23); 384 } 385 if (test_facility(78)) 386 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; 387 if (test_facility(3)) 388 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 389 if (test_facility(40)) 390 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP; 391 if (test_facility(50) && test_facility(73)) 392 S390_lowcore.machine_flags |= MACHINE_FLAG_TE; 393 if (test_facility(66)) 394 S390_lowcore.machine_flags |= MACHINE_FLAG_RRBM; 395 if (test_facility(51)) 396 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC; 397 #endif 398 } 399 400 static __init void rescue_initrd(void) 401 { 402 #ifdef CONFIG_BLK_DEV_INITRD 403 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20); 404 /* 405 * Just like in case of IPL from VM reader we make sure there is a 406 * gap of 4MB between end of kernel and start of initrd. 407 * That way we can also be sure that saving an NSS will succeed, 408 * which however only requires different segments. 409 */ 410 if (!INITRD_START || !INITRD_SIZE) 411 return; 412 if (INITRD_START >= min_initrd_addr) 413 return; 414 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE); 415 INITRD_START = min_initrd_addr; 416 #endif 417 } 418 419 /* Set up boot command line */ 420 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 421 { 422 char *parm, *delim; 423 size_t rc, len; 424 425 len = strlen(boot_command_line); 426 427 delim = boot_command_line + len; /* '\0' character position */ 428 parm = boot_command_line + len + 1; /* append right after '\0' */ 429 430 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 431 if (rc) { 432 if (*parm == '=') 433 memmove(boot_command_line, parm + 1, rc); 434 else 435 *delim = ' '; /* replace '\0' with space */ 436 } 437 } 438 439 static inline int has_ebcdic_char(const char *str) 440 { 441 int i; 442 443 for (i = 0; str[i]; i++) 444 if (str[i] & 0x80) 445 return 1; 446 return 0; 447 } 448 449 static void __init setup_boot_command_line(void) 450 { 451 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; 452 /* convert arch command line to ascii if necessary */ 453 if (has_ebcdic_char(COMMAND_LINE)) 454 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 455 /* copy arch command line */ 456 strlcpy(boot_command_line, strstrip(COMMAND_LINE), 457 ARCH_COMMAND_LINE_SIZE); 458 459 /* append IPL PARM data to the boot command line */ 460 if (MACHINE_IS_VM) 461 append_to_cmdline(append_ipl_vmparm); 462 463 append_to_cmdline(append_ipl_scpdata); 464 } 465 466 /* 467 * Save ipl parameters, clear bss memory, initialize storage keys 468 * and create a kernel NSS at startup if the SAVESYS= parm is defined 469 */ 470 void __init startup_init(void) 471 { 472 reset_tod_clock(); 473 ipl_save_parameters(); 474 rescue_initrd(); 475 clear_bss_section(); 476 init_kernel_storage_key(); 477 lockdep_init(); 478 lockdep_off(); 479 setup_lowcore_early(); 480 setup_facility_list(); 481 detect_machine_type(); 482 ipl_update_parameters(); 483 setup_boot_command_line(); 484 create_kernel_nss(); 485 detect_mvpg(); 486 detect_ieee(); 487 detect_csp(); 488 detect_diag9c(); 489 detect_diag44(); 490 detect_machine_facilities(); 491 setup_topology(); 492 sclp_early_detect(); 493 #ifdef CONFIG_DYNAMIC_FTRACE 494 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; 495 #endif 496 lockdep_on(); 497 } 498