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/module.h> 17 #include <linux/pfn.h> 18 #include <linux/uaccess.h> 19 #include <linux/kernel.h> 20 #include <asm/ebcdic.h> 21 #include <asm/ipl.h> 22 #include <asm/lowcore.h> 23 #include <asm/processor.h> 24 #include <asm/sections.h> 25 #include <asm/setup.h> 26 #include <asm/sysinfo.h> 27 #include <asm/cpcmd.h> 28 #include <asm/sclp.h> 29 #include <asm/facility.h> 30 #include "entry.h" 31 32 /* 33 * Create a Kernel NSS if the SAVESYS= parameter is defined 34 */ 35 #define DEFSYS_CMD_SIZE 128 36 #define SAVESYS_CMD_SIZE 32 37 38 char kernel_nss_name[NSS_NAME_SIZE + 1]; 39 40 static void __init setup_boot_command_line(void); 41 42 /* 43 * Get the TOD clock running. 44 */ 45 static void __init reset_tod_clock(void) 46 { 47 u64 time; 48 49 if (store_tod_clock(&time) == 0) 50 return; 51 /* TOD clock not running. Set the clock to Unix Epoch. */ 52 if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0) 53 disabled_wait(0); 54 55 sched_clock_base_cc = TOD_UNIX_EPOCH; 56 S390_lowcore.last_update_clock = sched_clock_base_cc; 57 } 58 59 #ifdef CONFIG_SHARED_KERNEL 60 int __init savesys_ipl_nss(char *cmd, const int cmdlen); 61 62 asm( 63 " .section .init.text,\"ax\",@progbits\n" 64 " .align 4\n" 65 " .type savesys_ipl_nss, @function\n" 66 "savesys_ipl_nss:\n" 67 #ifdef CONFIG_64BIT 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 #else 76 " stm 6,15,24(15)\n" 77 " lr 14,3\n" 78 " diag 2,14,0x8\n" 79 " lr 2,14\n" 80 " lm 6,15,24(15)\n" 81 #endif 82 " br 14\n" 83 " .size savesys_ipl_nss, .-savesys_ipl_nss\n" 84 " .previous\n"); 85 86 static __initdata char upper_command_line[COMMAND_LINE_SIZE]; 87 88 static noinline __init void create_kernel_nss(void) 89 { 90 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; 91 #ifdef CONFIG_BLK_DEV_INITRD 92 unsigned int sinitrd_pfn, einitrd_pfn; 93 #endif 94 int response; 95 int hlen; 96 size_t len; 97 char *savesys_ptr; 98 char defsys_cmd[DEFSYS_CMD_SIZE]; 99 char savesys_cmd[SAVESYS_CMD_SIZE]; 100 101 /* Do nothing if we are not running under VM */ 102 if (!MACHINE_IS_VM) 103 return; 104 105 /* Convert COMMAND_LINE to upper case */ 106 for (i = 0; i < strlen(boot_command_line); i++) 107 upper_command_line[i] = toupper(boot_command_line[i]); 108 109 savesys_ptr = strstr(upper_command_line, "SAVESYS="); 110 111 if (!savesys_ptr) 112 return; 113 114 savesys_ptr += 8; /* Point to the beginning of the NSS name */ 115 for (i = 0; i < NSS_NAME_SIZE; i++) { 116 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') 117 break; 118 kernel_nss_name[i] = savesys_ptr[i]; 119 } 120 121 stext_pfn = PFN_DOWN(__pa(&_stext)); 122 eshared_pfn = PFN_DOWN(__pa(&_eshared)); 123 end_pfn = PFN_UP(__pa(&_end)); 124 min_size = end_pfn << 2; 125 126 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE, 127 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", 128 kernel_nss_name, stext_pfn - 1, stext_pfn, 129 eshared_pfn - 1, eshared_pfn, end_pfn); 130 131 #ifdef CONFIG_BLK_DEV_INITRD 132 if (INITRD_START && INITRD_SIZE) { 133 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); 134 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); 135 min_size = einitrd_pfn << 2; 136 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 137 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn); 138 } 139 #endif 140 141 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 142 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size); 143 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0'; 144 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s", 145 kernel_nss_name, kernel_nss_name); 146 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0'; 147 148 __cpcmd(defsys_cmd, NULL, 0, &response); 149 150 if (response != 0) { 151 pr_err("Defining the Linux kernel NSS failed with rc=%d\n", 152 response); 153 kernel_nss_name[0] = '\0'; 154 return; 155 } 156 157 len = strlen(savesys_cmd); 158 ASCEBC(savesys_cmd, len); 159 response = savesys_ipl_nss(savesys_cmd, len); 160 161 /* On success: response is equal to the command size, 162 * max SAVESYS_CMD_SIZE 163 * On error: response contains the numeric portion of cp error message. 164 * for SAVESYS it will be >= 263 165 * for missing privilege class, it will be 1 166 */ 167 if (response > SAVESYS_CMD_SIZE || response == 1) { 168 pr_err("Saving the Linux kernel NSS failed with rc=%d\n", 169 response); 170 kernel_nss_name[0] = '\0'; 171 return; 172 } 173 174 /* re-initialize cputime accounting. */ 175 sched_clock_base_cc = get_tod_clock(); 176 S390_lowcore.last_update_clock = sched_clock_base_cc; 177 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL; 178 S390_lowcore.user_timer = 0; 179 S390_lowcore.system_timer = 0; 180 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer)); 181 182 /* re-setup boot command line with new ipl vm parms */ 183 ipl_update_parameters(); 184 setup_boot_command_line(); 185 186 ipl_flags = IPL_NSS_VALID; 187 } 188 189 #else /* CONFIG_SHARED_KERNEL */ 190 191 static inline void create_kernel_nss(void) { } 192 193 #endif /* CONFIG_SHARED_KERNEL */ 194 195 /* 196 * Clear bss memory 197 */ 198 static noinline __init void clear_bss_section(void) 199 { 200 memset(__bss_start, 0, __bss_stop - __bss_start); 201 } 202 203 /* 204 * Initialize storage key for kernel pages 205 */ 206 static noinline __init void init_kernel_storage_key(void) 207 { 208 #if PAGE_DEFAULT_KEY 209 unsigned long end_pfn, init_pfn; 210 211 end_pfn = PFN_UP(__pa(&_end)); 212 213 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 214 page_set_storage_key(init_pfn << PAGE_SHIFT, 215 PAGE_DEFAULT_KEY, 0); 216 #endif 217 } 218 219 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 220 221 static noinline __init void detect_machine_type(void) 222 { 223 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; 224 225 /* Check current-configuration-level */ 226 if (stsi(NULL, 0, 0, 0) <= 2) { 227 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 228 return; 229 } 230 /* Get virtual-machine cpu information. */ 231 if (stsi(vmms, 3, 2, 2) || !vmms->count) 232 return; 233 234 /* Running under KVM? If not we assume z/VM */ 235 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) 236 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 237 else 238 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 239 } 240 241 static __init void setup_topology(void) 242 { 243 #ifdef CONFIG_64BIT 244 int max_mnest; 245 246 if (!test_facility(11)) 247 return; 248 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 249 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 250 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 251 break; 252 } 253 topology_max_mnest = max_mnest; 254 #endif 255 } 256 257 static void early_pgm_check_handler(void) 258 { 259 const struct exception_table_entry *fixup; 260 unsigned long cr0, cr0_new; 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 /* Disable low address protection before storing into lowcore. */ 268 __ctl_store(cr0, 0, 0); 269 cr0_new = cr0 & ~(1UL << 28); 270 __ctl_load(cr0_new, 0, 0); 271 S390_lowcore.program_old_psw.addr = extable_fixup(fixup)|PSW_ADDR_AMODE; 272 __ctl_load(cr0, 0, 0); 273 } 274 275 static noinline __init void setup_lowcore_early(void) 276 { 277 psw_t psw; 278 279 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; 280 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 281 S390_lowcore.external_new_psw = psw; 282 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 283 S390_lowcore.program_new_psw = psw; 284 s390_base_pgm_handler_fn = early_pgm_check_handler; 285 } 286 287 static noinline __init void setup_facility_list(void) 288 { 289 stfle(S390_lowcore.stfle_fac_list, 290 ARRAY_SIZE(S390_lowcore.stfle_fac_list)); 291 } 292 293 static __init void detect_mvpg(void) 294 { 295 #ifndef CONFIG_64BIT 296 int rc; 297 298 asm volatile( 299 " la 0,0\n" 300 " mvpg %2,%2\n" 301 "0: la %0,0\n" 302 "1:\n" 303 EX_TABLE(0b,1b) 304 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 305 if (!rc) 306 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; 307 #endif 308 } 309 310 static __init void detect_ieee(void) 311 { 312 #ifndef CONFIG_64BIT 313 int rc, tmp; 314 315 asm volatile( 316 " efpc %1,0\n" 317 "0: la %0,0\n" 318 "1:\n" 319 EX_TABLE(0b,1b) 320 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 321 if (!rc) 322 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; 323 #endif 324 } 325 326 static __init void detect_csp(void) 327 { 328 #ifndef CONFIG_64BIT 329 int rc; 330 331 asm volatile( 332 " la 0,0\n" 333 " la 1,0\n" 334 " la 2,4\n" 335 " csp 0,2\n" 336 "0: la %0,0\n" 337 "1:\n" 338 EX_TABLE(0b,1b) 339 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 340 if (!rc) 341 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; 342 #endif 343 } 344 345 static __init void detect_diag9c(void) 346 { 347 unsigned int cpu_address; 348 int rc; 349 350 cpu_address = stap(); 351 asm volatile( 352 " diag %2,0,0x9c\n" 353 "0: la %0,0\n" 354 "1:\n" 355 EX_TABLE(0b,1b) 356 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 357 if (!rc) 358 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 359 } 360 361 static __init void detect_diag44(void) 362 { 363 #ifdef CONFIG_64BIT 364 int rc; 365 366 asm volatile( 367 " diag 0,0,0x44\n" 368 "0: la %0,0\n" 369 "1:\n" 370 EX_TABLE(0b,1b) 371 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 372 if (!rc) 373 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 374 #endif 375 } 376 377 static __init void detect_machine_facilities(void) 378 { 379 #ifdef CONFIG_64BIT 380 if (test_facility(8)) { 381 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; 382 __ctl_set_bit(0, 23); 383 } 384 if (test_facility(78)) 385 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; 386 if (test_facility(3)) 387 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 388 if (test_facility(40)) 389 S390_lowcore.machine_flags |= MACHINE_FLAG_LPP; 390 if (test_facility(50) && test_facility(73)) 391 S390_lowcore.machine_flags |= MACHINE_FLAG_TE; 392 if (test_facility(51)) 393 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC; 394 if (test_facility(129)) 395 S390_lowcore.machine_flags |= MACHINE_FLAG_VX; 396 #endif 397 } 398 399 static __init void rescue_initrd(void) 400 { 401 #ifdef CONFIG_BLK_DEV_INITRD 402 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20); 403 /* 404 * Just like in case of IPL from VM reader we make sure there is a 405 * gap of 4MB between end of kernel and start of initrd. 406 * That way we can also be sure that saving an NSS will succeed, 407 * which however only requires different segments. 408 */ 409 if (!INITRD_START || !INITRD_SIZE) 410 return; 411 if (INITRD_START >= min_initrd_addr) 412 return; 413 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE); 414 INITRD_START = min_initrd_addr; 415 #endif 416 } 417 418 /* Set up boot command line */ 419 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 420 { 421 char *parm, *delim; 422 size_t rc, len; 423 424 len = strlen(boot_command_line); 425 426 delim = boot_command_line + len; /* '\0' character position */ 427 parm = boot_command_line + len + 1; /* append right after '\0' */ 428 429 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 430 if (rc) { 431 if (*parm == '=') 432 memmove(boot_command_line, parm + 1, rc); 433 else 434 *delim = ' '; /* replace '\0' with space */ 435 } 436 } 437 438 static inline int has_ebcdic_char(const char *str) 439 { 440 int i; 441 442 for (i = 0; str[i]; i++) 443 if (str[i] & 0x80) 444 return 1; 445 return 0; 446 } 447 448 static void __init setup_boot_command_line(void) 449 { 450 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; 451 /* convert arch command line to ascii if necessary */ 452 if (has_ebcdic_char(COMMAND_LINE)) 453 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 454 /* copy arch command line */ 455 strlcpy(boot_command_line, strstrip(COMMAND_LINE), 456 ARCH_COMMAND_LINE_SIZE); 457 458 /* append IPL PARM data to the boot command line */ 459 if (MACHINE_IS_VM) 460 append_to_cmdline(append_ipl_vmparm); 461 462 append_to_cmdline(append_ipl_scpdata); 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 setup_lowcore_early(); 479 setup_facility_list(); 480 detect_machine_type(); 481 ipl_update_parameters(); 482 setup_boot_command_line(); 483 create_kernel_nss(); 484 detect_mvpg(); 485 detect_ieee(); 486 detect_csp(); 487 detect_diag9c(); 488 detect_diag44(); 489 detect_machine_facilities(); 490 setup_topology(); 491 sclp_early_detect(); 492 lockdep_on(); 493 } 494