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 <asm/facility.h> 33 #include "entry.h" 34 35 /* 36 * Create a Kernel NSS if the SAVESYS= parameter is defined 37 */ 38 #define DEFSYS_CMD_SIZE 128 39 #define SAVESYS_CMD_SIZE 32 40 41 char kernel_nss_name[NSS_NAME_SIZE + 1]; 42 43 static void __init setup_boot_command_line(void); 44 45 /* 46 * Get the TOD clock running. 47 */ 48 static void __init reset_tod_clock(void) 49 { 50 u64 time; 51 52 if (store_clock(&time) == 0) 53 return; 54 /* TOD clock not running. Set the clock to Unix Epoch. */ 55 if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0) 56 disabled_wait(0); 57 58 sched_clock_base_cc = TOD_UNIX_EPOCH; 59 S390_lowcore.last_update_clock = sched_clock_base_cc; 60 } 61 62 #ifdef CONFIG_SHARED_KERNEL 63 int __init savesys_ipl_nss(char *cmd, const int cmdlen); 64 65 asm( 66 " .section .init.text,\"ax\",@progbits\n" 67 " .align 4\n" 68 " .type savesys_ipl_nss, @function\n" 69 "savesys_ipl_nss:\n" 70 #ifdef CONFIG_64BIT 71 " stmg 6,15,48(15)\n" 72 " lgr 14,3\n" 73 " sam31\n" 74 " diag 2,14,0x8\n" 75 " sam64\n" 76 " lgr 2,14\n" 77 " lmg 6,15,48(15)\n" 78 #else 79 " stm 6,15,24(15)\n" 80 " lr 14,3\n" 81 " diag 2,14,0x8\n" 82 " lr 2,14\n" 83 " lm 6,15,24(15)\n" 84 #endif 85 " br 14\n" 86 " .size savesys_ipl_nss, .-savesys_ipl_nss\n" 87 " .previous\n"); 88 89 static __initdata char upper_command_line[COMMAND_LINE_SIZE]; 90 91 static noinline __init void create_kernel_nss(void) 92 { 93 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; 94 #ifdef CONFIG_BLK_DEV_INITRD 95 unsigned int sinitrd_pfn, einitrd_pfn; 96 #endif 97 int response; 98 int hlen; 99 size_t len; 100 char *savesys_ptr; 101 char defsys_cmd[DEFSYS_CMD_SIZE]; 102 char savesys_cmd[SAVESYS_CMD_SIZE]; 103 104 /* Do nothing if we are not running under VM */ 105 if (!MACHINE_IS_VM) 106 return; 107 108 /* Convert COMMAND_LINE to upper case */ 109 for (i = 0; i < strlen(boot_command_line); i++) 110 upper_command_line[i] = toupper(boot_command_line[i]); 111 112 savesys_ptr = strstr(upper_command_line, "SAVESYS="); 113 114 if (!savesys_ptr) 115 return; 116 117 savesys_ptr += 8; /* Point to the beginning of the NSS name */ 118 for (i = 0; i < NSS_NAME_SIZE; i++) { 119 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') 120 break; 121 kernel_nss_name[i] = savesys_ptr[i]; 122 } 123 124 stext_pfn = PFN_DOWN(__pa(&_stext)); 125 eshared_pfn = PFN_DOWN(__pa(&_eshared)); 126 end_pfn = PFN_UP(__pa(&_end)); 127 min_size = end_pfn << 2; 128 129 hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE, 130 "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", 131 kernel_nss_name, stext_pfn - 1, stext_pfn, 132 eshared_pfn - 1, eshared_pfn, end_pfn); 133 134 #ifdef CONFIG_BLK_DEV_INITRD 135 if (INITRD_START && INITRD_SIZE) { 136 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); 137 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); 138 min_size = einitrd_pfn << 2; 139 hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 140 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn); 141 } 142 #endif 143 144 snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen, 145 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size); 146 defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0'; 147 snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s", 148 kernel_nss_name, kernel_nss_name); 149 savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0'; 150 151 __cpcmd(defsys_cmd, NULL, 0, &response); 152 153 if (response != 0) { 154 pr_err("Defining the Linux kernel NSS failed with rc=%d\n", 155 response); 156 kernel_nss_name[0] = '\0'; 157 return; 158 } 159 160 len = strlen(savesys_cmd); 161 ASCEBC(savesys_cmd, len); 162 response = savesys_ipl_nss(savesys_cmd, len); 163 164 /* On success: response is equal to the command size, 165 * max SAVESYS_CMD_SIZE 166 * On error: response contains the numeric portion of cp error message. 167 * for SAVESYS it will be >= 263 168 * for missing privilege class, it will be 1 169 */ 170 if (response > SAVESYS_CMD_SIZE || response == 1) { 171 pr_err("Saving the Linux kernel NSS failed with rc=%d\n", 172 response); 173 kernel_nss_name[0] = '\0'; 174 return; 175 } 176 177 /* re-initialize cputime accounting. */ 178 sched_clock_base_cc = get_clock(); 179 S390_lowcore.last_update_clock = sched_clock_base_cc; 180 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL; 181 S390_lowcore.user_timer = 0; 182 S390_lowcore.system_timer = 0; 183 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer)); 184 185 /* re-setup boot command line with new ipl vm parms */ 186 ipl_update_parameters(); 187 setup_boot_command_line(); 188 189 ipl_flags = IPL_NSS_VALID; 190 } 191 192 #else /* CONFIG_SHARED_KERNEL */ 193 194 static inline void create_kernel_nss(void) { } 195 196 #endif /* CONFIG_SHARED_KERNEL */ 197 198 /* 199 * Clear bss memory 200 */ 201 static noinline __init void clear_bss_section(void) 202 { 203 memset(__bss_start, 0, __bss_stop - __bss_start); 204 } 205 206 /* 207 * Initialize storage key for kernel pages 208 */ 209 static noinline __init void init_kernel_storage_key(void) 210 { 211 unsigned long end_pfn, init_pfn; 212 213 end_pfn = PFN_UP(__pa(&_end)); 214 215 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 216 page_set_storage_key(init_pfn << PAGE_SHIFT, 217 PAGE_DEFAULT_KEY, 0); 218 } 219 220 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); 221 222 static noinline __init void detect_machine_type(void) 223 { 224 /* Check current-configuration-level */ 225 if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) { 226 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 227 return; 228 } 229 /* Get virtual-machine cpu information. */ 230 if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count) 231 return; 232 233 /* Running under KVM? If not we assume z/VM */ 234 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) 235 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 236 else 237 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 238 } 239 240 static __init void early_pgm_check_handler(void) 241 { 242 unsigned long addr; 243 const struct exception_table_entry *fixup; 244 245 addr = S390_lowcore.program_old_psw.addr; 246 fixup = search_exception_tables(addr & PSW_ADDR_INSN); 247 if (!fixup) 248 disabled_wait(0); 249 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; 250 } 251 252 static noinline __init void setup_lowcore_early(void) 253 { 254 psw_t psw; 255 256 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; 257 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 258 S390_lowcore.external_new_psw = psw; 259 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 260 S390_lowcore.program_new_psw = psw; 261 s390_base_pgm_handler_fn = early_pgm_check_handler; 262 } 263 264 static noinline __init void setup_facility_list(void) 265 { 266 stfle(S390_lowcore.stfle_fac_list, 267 ARRAY_SIZE(S390_lowcore.stfle_fac_list)); 268 } 269 270 static noinline __init void setup_hpage(void) 271 { 272 #ifndef CONFIG_DEBUG_PAGEALLOC 273 if (!test_facility(2) || !test_facility(8)) 274 return; 275 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE; 276 __ctl_set_bit(0, 23); 277 #endif 278 } 279 280 static __init void detect_mvpg(void) 281 { 282 #ifndef CONFIG_64BIT 283 int rc; 284 285 asm volatile( 286 " la 0,0\n" 287 " mvpg %2,%2\n" 288 "0: la %0,0\n" 289 "1:\n" 290 EX_TABLE(0b,1b) 291 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 292 if (!rc) 293 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; 294 #endif 295 } 296 297 static __init void detect_ieee(void) 298 { 299 #ifndef CONFIG_64BIT 300 int rc, tmp; 301 302 asm volatile( 303 " efpc %1,0\n" 304 "0: la %0,0\n" 305 "1:\n" 306 EX_TABLE(0b,1b) 307 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 308 if (!rc) 309 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; 310 #endif 311 } 312 313 static __init void detect_csp(void) 314 { 315 #ifndef CONFIG_64BIT 316 int rc; 317 318 asm volatile( 319 " la 0,0\n" 320 " la 1,0\n" 321 " la 2,4\n" 322 " csp 0,2\n" 323 "0: la %0,0\n" 324 "1:\n" 325 EX_TABLE(0b,1b) 326 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 327 if (!rc) 328 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; 329 #endif 330 } 331 332 static __init void detect_diag9c(void) 333 { 334 unsigned int cpu_address; 335 int rc; 336 337 cpu_address = stap(); 338 asm volatile( 339 " diag %2,0,0x9c\n" 340 "0: la %0,0\n" 341 "1:\n" 342 EX_TABLE(0b,1b) 343 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 344 if (!rc) 345 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 346 } 347 348 static __init void detect_diag44(void) 349 { 350 #ifdef CONFIG_64BIT 351 int rc; 352 353 asm volatile( 354 " diag 0,0,0x44\n" 355 "0: la %0,0\n" 356 "1:\n" 357 EX_TABLE(0b,1b) 358 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 359 if (!rc) 360 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 361 #endif 362 } 363 364 static __init void detect_machine_facilities(void) 365 { 366 #ifdef CONFIG_64BIT 367 if (test_facility(3)) 368 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 369 if (test_facility(8)) 370 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF; 371 if (test_facility(11)) 372 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 373 if (test_facility(27)) 374 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; 375 if (test_facility(40)) 376 S390_lowcore.machine_flags |= MACHINE_FLAG_SPP; 377 if (test_facility(25)) 378 S390_lowcore.machine_flags |= MACHINE_FLAG_STCKF; 379 #endif 380 } 381 382 static __init void rescue_initrd(void) 383 { 384 #ifdef CONFIG_BLK_DEV_INITRD 385 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20); 386 /* 387 * Just like in case of IPL from VM reader we make sure there is a 388 * gap of 4MB between end of kernel and start of initrd. 389 * That way we can also be sure that saving an NSS will succeed, 390 * which however only requires different segments. 391 */ 392 if (!INITRD_START || !INITRD_SIZE) 393 return; 394 if (INITRD_START >= min_initrd_addr) 395 return; 396 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE); 397 INITRD_START = min_initrd_addr; 398 #endif 399 } 400 401 /* Set up boot command line */ 402 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 403 { 404 char *parm, *delim; 405 size_t rc, len; 406 407 len = strlen(boot_command_line); 408 409 delim = boot_command_line + len; /* '\0' character position */ 410 parm = boot_command_line + len + 1; /* append right after '\0' */ 411 412 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 413 if (rc) { 414 if (*parm == '=') 415 memmove(boot_command_line, parm + 1, rc); 416 else 417 *delim = ' '; /* replace '\0' with space */ 418 } 419 } 420 421 static inline int has_ebcdic_char(const char *str) 422 { 423 int i; 424 425 for (i = 0; str[i]; i++) 426 if (str[i] & 0x80) 427 return 1; 428 return 0; 429 } 430 431 static void __init setup_boot_command_line(void) 432 { 433 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; 434 /* convert arch command line to ascii if necessary */ 435 if (has_ebcdic_char(COMMAND_LINE)) 436 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 437 /* copy arch command line */ 438 strlcpy(boot_command_line, strstrip(COMMAND_LINE), 439 ARCH_COMMAND_LINE_SIZE); 440 441 /* append IPL PARM data to the boot command line */ 442 if (MACHINE_IS_VM) 443 append_to_cmdline(append_ipl_vmparm); 444 445 append_to_cmdline(append_ipl_scpdata); 446 } 447 448 449 /* 450 * Save ipl parameters, clear bss memory, initialize storage keys 451 * and create a kernel NSS at startup if the SAVESYS= parm is defined 452 */ 453 void __init startup_init(void) 454 { 455 reset_tod_clock(); 456 ipl_save_parameters(); 457 rescue_initrd(); 458 clear_bss_section(); 459 init_kernel_storage_key(); 460 lockdep_init(); 461 lockdep_off(); 462 sort_main_extable(); 463 setup_lowcore_early(); 464 setup_facility_list(); 465 detect_machine_type(); 466 ipl_update_parameters(); 467 setup_boot_command_line(); 468 create_kernel_nss(); 469 detect_mvpg(); 470 detect_ieee(); 471 detect_csp(); 472 detect_diag9c(); 473 detect_diag44(); 474 detect_machine_facilities(); 475 setup_hpage(); 476 sclp_facilities_detect(); 477 detect_memory_layout(memory_chunk); 478 #ifdef CONFIG_DYNAMIC_FTRACE 479 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; 480 #endif 481 lockdep_on(); 482 } 483