1 /* 2 * arch/s390/kernel/early.c 3 * 4 * Copyright IBM Corp. 2007, 2009 5 * Author(s): Hongjie Yang <hongjie@us.ibm.com>, 6 * Heiko Carstens <heiko.carstens@de.ibm.com> 7 */ 8 9 #define KMSG_COMPONENT "setup" 10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 11 12 #include <linux/compiler.h> 13 #include <linux/init.h> 14 #include <linux/errno.h> 15 #include <linux/string.h> 16 #include <linux/ctype.h> 17 #include <linux/ftrace.h> 18 #include <linux/lockdep.h> 19 #include <linux/module.h> 20 #include <linux/pfn.h> 21 #include <linux/uaccess.h> 22 #include <linux/kernel.h> 23 #include <asm/ebcdic.h> 24 #include <asm/ipl.h> 25 #include <asm/lowcore.h> 26 #include <asm/processor.h> 27 #include <asm/sections.h> 28 #include <asm/setup.h> 29 #include <asm/sysinfo.h> 30 #include <asm/cpcmd.h> 31 #include <asm/sclp.h> 32 #include "entry.h" 33 34 /* 35 * Create a Kernel NSS if the SAVESYS= parameter is defined 36 */ 37 #define DEFSYS_CMD_SIZE 128 38 #define SAVESYS_CMD_SIZE 32 39 40 char kernel_nss_name[NSS_NAME_SIZE + 1]; 41 42 static void __init setup_boot_command_line(void); 43 44 /* 45 * Get the TOD clock running. 46 */ 47 static void __init reset_tod_clock(void) 48 { 49 u64 time; 50 51 if (store_clock(&time) == 0) 52 return; 53 /* TOD clock not running. Set the clock to Unix Epoch. */ 54 if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0) 55 disabled_wait(0); 56 57 sched_clock_base_cc = TOD_UNIX_EPOCH; 58 S390_lowcore.last_update_clock = sched_clock_base_cc; 59 } 60 61 #ifdef CONFIG_SHARED_KERNEL 62 int __init savesys_ipl_nss(char *cmd, const int cmdlen); 63 64 asm( 65 " .section .init.text,\"ax\",@progbits\n" 66 " .align 4\n" 67 " .type savesys_ipl_nss, @function\n" 68 "savesys_ipl_nss:\n" 69 #ifdef CONFIG_64BIT 70 " stmg 6,15,48(15)\n" 71 " lgr 14,3\n" 72 " sam31\n" 73 " diag 2,14,0x8\n" 74 " sam64\n" 75 " lgr 2,14\n" 76 " lmg 6,15,48(15)\n" 77 #else 78 " stm 6,15,24(15)\n" 79 " lr 14,3\n" 80 " diag 2,14,0x8\n" 81 " lr 2,14\n" 82 " lm 6,15,24(15)\n" 83 #endif 84 " br 14\n" 85 " .size savesys_ipl_nss, .-savesys_ipl_nss\n" 86 " .previous\n"); 87 88 static __initdata char upper_command_line[COMMAND_LINE_SIZE]; 89 90 static noinline __init void create_kernel_nss(void) 91 { 92 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; 93 #ifdef CONFIG_BLK_DEV_INITRD 94 unsigned int sinitrd_pfn, einitrd_pfn; 95 #endif 96 int response; 97 int hlen; 98 size_t len; 99 char *savesys_ptr; 100 char defsys_cmd[DEFSYS_CMD_SIZE]; 101 char savesys_cmd[SAVESYS_CMD_SIZE]; 102 103 /* Do nothing if we are not running under VM */ 104 if (!MACHINE_IS_VM) 105 return; 106 107 /* Convert COMMAND_LINE to upper case */ 108 for (i = 0; i < strlen(boot_command_line); i++) 109 upper_command_line[i] = toupper(boot_command_line[i]); 110 111 savesys_ptr = strstr(upper_command_line, "SAVESYS="); 112 113 if (!savesys_ptr) 114 return; 115 116 savesys_ptr += 8; /* Point to the beginning of the NSS name */ 117 for (i = 0; i < NSS_NAME_SIZE; i++) { 118 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') 119 break; 120 kernel_nss_name[i] = savesys_ptr[i]; 121 } 122 123 stext_pfn = PFN_DOWN(__pa(&_stext)); 124 eshared_pfn = PFN_DOWN(__pa(&_eshared)); 125 end_pfn = PFN_UP(__pa(&_end)); 126 min_size = end_pfn << 2; 127 128 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE, 129 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", 130 kernel_nss_name, stext_pfn - 1, stext_pfn, 131 eshared_pfn - 1, eshared_pfn, end_pfn); 132 133 #ifdef CONFIG_BLK_DEV_INITRD 134 if (INITRD_START && INITRD_SIZE) { 135 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); 136 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); 137 min_size = einitrd_pfn << 2; 138 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 139 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn); 140 } 141 #endif 142 143 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 144 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size); 145 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0'; 146 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s", 147 kernel_nss_name, kernel_nss_name); 148 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0'; 149 150 __cpcmd(defsys_cmd, NULL, 0, &response); 151 152 if (response != 0) { 153 pr_err("Defining the Linux kernel NSS failed with rc=%d\n", 154 response); 155 kernel_nss_name[0] = '\0'; 156 return; 157 } 158 159 len = strlen(savesys_cmd); 160 ASCEBC(savesys_cmd, len); 161 response = savesys_ipl_nss(savesys_cmd, len); 162 163 /* On success: response is equal to the command size, 164 * max SAVESYS_CMD_SIZE 165 * On error: response contains the numeric portion of cp error message. 166 * for SAVESYS it will be >= 263 167 * for missing privilege class, it will be 1 168 */ 169 if (response > SAVESYS_CMD_SIZE || response == 1) { 170 pr_err("Saving the Linux kernel NSS failed with rc=%d\n", 171 response); 172 kernel_nss_name[0] = '\0'; 173 return; 174 } 175 176 /* re-initialize cputime accounting. */ 177 sched_clock_base_cc = get_clock(); 178 S390_lowcore.last_update_clock = sched_clock_base_cc; 179 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL; 180 S390_lowcore.user_timer = 0; 181 S390_lowcore.system_timer = 0; 182 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer)); 183 184 /* re-setup boot command line with new ipl vm parms */ 185 ipl_update_parameters(); 186 setup_boot_command_line(); 187 188 ipl_flags = IPL_NSS_VALID; 189 } 190 191 #else /* CONFIG_SHARED_KERNEL */ 192 193 static inline void create_kernel_nss(void) { } 194 195 #endif /* CONFIG_SHARED_KERNEL */ 196 197 /* 198 * Clear bss memory 199 */ 200 static noinline __init void clear_bss_section(void) 201 { 202 memset(__bss_start, 0, __bss_stop - __bss_start); 203 } 204 205 /* 206 * Initialize storage key for kernel pages 207 */ 208 static noinline __init void init_kernel_storage_key(void) 209 { 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 } 218 219 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); 220 221 static noinline __init void detect_machine_type(void) 222 { 223 /* Check current-configuration-level */ 224 if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) { 225 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 226 return; 227 } 228 /* Get virtual-machine cpu information. */ 229 if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count) 230 return; 231 232 /* Running under KVM? If not we assume z/VM */ 233 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) 234 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 235 else 236 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 237 } 238 239 static __init void early_pgm_check_handler(void) 240 { 241 unsigned long addr; 242 const struct exception_table_entry *fixup; 243 244 addr = S390_lowcore.program_old_psw.addr; 245 fixup = search_exception_tables(addr & PSW_ADDR_INSN); 246 if (!fixup) 247 disabled_wait(0); 248 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; 249 } 250 251 static noinline __init void setup_lowcore_early(void) 252 { 253 psw_t psw; 254 255 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; 256 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 257 S390_lowcore.external_new_psw = psw; 258 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 259 S390_lowcore.program_new_psw = psw; 260 s390_base_pgm_handler_fn = early_pgm_check_handler; 261 } 262 263 static noinline __init void setup_facility_list(void) 264 { 265 unsigned long nr; 266 267 S390_lowcore.stfl_fac_list = 0; 268 asm volatile( 269 " .insn s,0xb2b10000,0(0)\n" /* stfl */ 270 "0:\n" 271 EX_TABLE(0b,0b) : "=m" (S390_lowcore.stfl_fac_list)); 272 memcpy(&S390_lowcore.stfle_fac_list, &S390_lowcore.stfl_fac_list, 4); 273 nr = 4; /* # bytes stored by stfl */ 274 if (test_facility(7)) { 275 /* More facility bits available with stfle */ 276 register unsigned long reg0 asm("0") = MAX_FACILITY_BIT/64 - 1; 277 asm volatile(".insn s,0xb2b00000,%0" /* stfle */ 278 : "=m" (S390_lowcore.stfle_fac_list), "+d" (reg0) 279 : : "cc"); 280 nr = (reg0 + 1) * 8; /* # bytes stored by stfle */ 281 } 282 memset((char *) S390_lowcore.stfle_fac_list + nr, 0, 283 MAX_FACILITY_BIT/8 - nr); 284 } 285 286 static noinline __init void setup_hpage(void) 287 { 288 #ifndef CONFIG_DEBUG_PAGEALLOC 289 if (!test_facility(2) || !test_facility(8)) 290 return; 291 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE; 292 __ctl_set_bit(0, 23); 293 #endif 294 } 295 296 static __init void detect_mvpg(void) 297 { 298 #ifndef CONFIG_64BIT 299 int rc; 300 301 asm volatile( 302 " la 0,0\n" 303 " mvpg %2,%2\n" 304 "0: la %0,0\n" 305 "1:\n" 306 EX_TABLE(0b,1b) 307 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 308 if (!rc) 309 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; 310 #endif 311 } 312 313 static __init void detect_ieee(void) 314 { 315 #ifndef CONFIG_64BIT 316 int rc, tmp; 317 318 asm volatile( 319 " efpc %1,0\n" 320 "0: la %0,0\n" 321 "1:\n" 322 EX_TABLE(0b,1b) 323 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 324 if (!rc) 325 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; 326 #endif 327 } 328 329 static __init void detect_csp(void) 330 { 331 #ifndef CONFIG_64BIT 332 int rc; 333 334 asm volatile( 335 " la 0,0\n" 336 " la 1,0\n" 337 " la 2,4\n" 338 " csp 0,2\n" 339 "0: la %0,0\n" 340 "1:\n" 341 EX_TABLE(0b,1b) 342 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 343 if (!rc) 344 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; 345 #endif 346 } 347 348 static __init void detect_diag9c(void) 349 { 350 unsigned int cpu_address; 351 int rc; 352 353 cpu_address = stap(); 354 asm volatile( 355 " diag %2,0,0x9c\n" 356 "0: la %0,0\n" 357 "1:\n" 358 EX_TABLE(0b,1b) 359 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 360 if (!rc) 361 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 362 } 363 364 static __init void detect_diag44(void) 365 { 366 #ifdef CONFIG_64BIT 367 int rc; 368 369 asm volatile( 370 " diag 0,0,0x44\n" 371 "0: la %0,0\n" 372 "1:\n" 373 EX_TABLE(0b,1b) 374 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 375 if (!rc) 376 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 377 #endif 378 } 379 380 static __init void detect_machine_facilities(void) 381 { 382 #ifdef CONFIG_64BIT 383 if (test_facility(3)) 384 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 385 if (test_facility(8)) 386 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF; 387 if (test_facility(11)) 388 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 389 if (test_facility(27)) 390 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; 391 if (test_facility(40)) 392 S390_lowcore.machine_flags |= MACHINE_FLAG_SPP; 393 if (test_facility(25)) 394 S390_lowcore.machine_flags |= MACHINE_FLAG_STCKF; 395 #endif 396 } 397 398 static __init void rescue_initrd(void) 399 { 400 #ifdef CONFIG_BLK_DEV_INITRD 401 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20); 402 /* 403 * Just like in case of IPL from VM reader we make sure there is a 404 * gap of 4MB between end of kernel and start of initrd. 405 * That way we can also be sure that saving an NSS will succeed, 406 * which however only requires different segments. 407 */ 408 if (!INITRD_START || !INITRD_SIZE) 409 return; 410 if (INITRD_START >= min_initrd_addr) 411 return; 412 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE); 413 INITRD_START = min_initrd_addr; 414 #endif 415 } 416 417 /* Set up boot command line */ 418 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 419 { 420 char *parm, *delim; 421 size_t rc, len; 422 423 len = strlen(boot_command_line); 424 425 delim = boot_command_line + len; /* '\0' character position */ 426 parm = boot_command_line + len + 1; /* append right after '\0' */ 427 428 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 429 if (rc) { 430 if (*parm == '=') 431 memmove(boot_command_line, parm + 1, rc); 432 else 433 *delim = ' '; /* replace '\0' with space */ 434 } 435 } 436 437 static inline int has_ebcdic_char(const char *str) 438 { 439 int i; 440 441 for (i = 0; str[i]; i++) 442 if (str[i] & 0x80) 443 return 1; 444 return 0; 445 } 446 447 static void __init setup_boot_command_line(void) 448 { 449 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; 450 /* convert arch command line to ascii if necessary */ 451 if (has_ebcdic_char(COMMAND_LINE)) 452 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 453 /* copy arch command line */ 454 strlcpy(boot_command_line, strstrip(COMMAND_LINE), 455 ARCH_COMMAND_LINE_SIZE); 456 457 /* append IPL PARM data to the boot command line */ 458 if (MACHINE_IS_VM) 459 append_to_cmdline(append_ipl_vmparm); 460 461 append_to_cmdline(append_ipl_scpdata); 462 } 463 464 465 /* 466 * Save ipl parameters, clear bss memory, initialize storage keys 467 * and create a kernel NSS at startup if the SAVESYS= parm is defined 468 */ 469 void __init startup_init(void) 470 { 471 reset_tod_clock(); 472 ipl_save_parameters(); 473 rescue_initrd(); 474 clear_bss_section(); 475 init_kernel_storage_key(); 476 lockdep_init(); 477 lockdep_off(); 478 sort_main_extable(); 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_hpage(); 492 sclp_facilities_detect(); 493 detect_memory_layout(memory_chunk); 494 #ifdef CONFIG_DYNAMIC_FTRACE 495 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; 496 #endif 497 lockdep_on(); 498 } 499