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 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 sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", 128 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1, 129 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 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd, 137 sinitrd_pfn, einitrd_pfn); 138 } 139 #endif 140 141 sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13", 142 defsys_cmd, min_size); 143 sprintf(savesys_cmd, "SAVESYS %s \n IPL %s", 144 kernel_nss_name, kernel_nss_name); 145 146 __cpcmd(defsys_cmd, NULL, 0, &response); 147 148 if (response != 0) { 149 pr_err("Defining the Linux kernel NSS failed with rc=%d\n", 150 response); 151 kernel_nss_name[0] = '\0'; 152 return; 153 } 154 155 len = strlen(savesys_cmd); 156 ASCEBC(savesys_cmd, len); 157 response = savesys_ipl_nss(savesys_cmd, len); 158 159 /* On success: response is equal to the command size, 160 * max SAVESYS_CMD_SIZE 161 * On error: response contains the numeric portion of cp error message. 162 * for SAVESYS it will be >= 263 163 * for missing privilege class, it will be 1 164 */ 165 if (response > SAVESYS_CMD_SIZE || response == 1) { 166 pr_err("Saving the Linux kernel NSS failed with rc=%d\n", 167 response); 168 kernel_nss_name[0] = '\0'; 169 return; 170 } 171 172 /* re-initialize cputime accounting. */ 173 sched_clock_base_cc = get_clock(); 174 S390_lowcore.last_update_clock = sched_clock_base_cc; 175 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL; 176 S390_lowcore.user_timer = 0; 177 S390_lowcore.system_timer = 0; 178 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer)); 179 180 /* re-setup boot command line with new ipl vm parms */ 181 ipl_update_parameters(); 182 setup_boot_command_line(); 183 184 ipl_flags = IPL_NSS_VALID; 185 } 186 187 #else /* CONFIG_SHARED_KERNEL */ 188 189 static inline void create_kernel_nss(void) { } 190 191 #endif /* CONFIG_SHARED_KERNEL */ 192 193 /* 194 * Clear bss memory 195 */ 196 static noinline __init void clear_bss_section(void) 197 { 198 memset(__bss_start, 0, __bss_stop - __bss_start); 199 } 200 201 /* 202 * Initialize storage key for kernel pages 203 */ 204 static noinline __init void init_kernel_storage_key(void) 205 { 206 unsigned long end_pfn, init_pfn; 207 208 end_pfn = PFN_UP(__pa(&_end)); 209 210 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 211 page_set_storage_key(init_pfn << PAGE_SHIFT, 212 PAGE_DEFAULT_KEY, 0); 213 } 214 215 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); 216 217 static noinline __init void detect_machine_type(void) 218 { 219 /* Check current-configuration-level */ 220 if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) { 221 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 222 return; 223 } 224 /* Get virtual-machine cpu information. */ 225 if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count) 226 return; 227 228 /* Running under KVM? If not we assume z/VM */ 229 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) 230 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 231 else 232 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 233 } 234 235 static __init void early_pgm_check_handler(void) 236 { 237 unsigned long addr; 238 const struct exception_table_entry *fixup; 239 240 addr = S390_lowcore.program_old_psw.addr; 241 fixup = search_exception_tables(addr & PSW_ADDR_INSN); 242 if (!fixup) 243 disabled_wait(0); 244 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; 245 } 246 247 static noinline __init void setup_lowcore_early(void) 248 { 249 psw_t psw; 250 251 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 252 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 253 S390_lowcore.external_new_psw = psw; 254 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 255 S390_lowcore.program_new_psw = psw; 256 s390_base_pgm_handler_fn = early_pgm_check_handler; 257 } 258 259 static noinline __init void setup_facility_list(void) 260 { 261 unsigned long nr; 262 263 S390_lowcore.stfl_fac_list = 0; 264 asm volatile( 265 " .insn s,0xb2b10000,0(0)\n" /* stfl */ 266 "0:\n" 267 EX_TABLE(0b,0b) : "=m" (S390_lowcore.stfl_fac_list)); 268 memcpy(&S390_lowcore.stfle_fac_list, &S390_lowcore.stfl_fac_list, 4); 269 nr = 4; /* # bytes stored by stfl */ 270 if (test_facility(7)) { 271 /* More facility bits available with stfle */ 272 register unsigned long reg0 asm("0") = MAX_FACILITY_BIT/64 - 1; 273 asm volatile(".insn s,0xb2b00000,%0" /* stfle */ 274 : "=m" (S390_lowcore.stfle_fac_list), "+d" (reg0) 275 : : "cc"); 276 nr = (reg0 + 1) * 8; /* # bytes stored by stfle */ 277 } 278 memset((char *) S390_lowcore.stfle_fac_list + nr, 0, 279 MAX_FACILITY_BIT/8 - nr); 280 } 281 282 static noinline __init void setup_hpage(void) 283 { 284 #ifndef CONFIG_DEBUG_PAGEALLOC 285 unsigned int facilities; 286 287 if (!test_facility(2) || !test_facility(8)) 288 return; 289 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE; 290 __ctl_set_bit(0, 23); 291 #endif 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(3)) 382 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 383 if (test_facility(8)) 384 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF; 385 if (test_facility(11)) 386 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 387 if (test_facility(27)) 388 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; 389 if (test_facility(40)) 390 S390_lowcore.machine_flags |= MACHINE_FLAG_SPP; 391 #endif 392 } 393 394 static __init void rescue_initrd(void) 395 { 396 #ifdef CONFIG_BLK_DEV_INITRD 397 /* 398 * Move the initrd right behind the bss section in case it starts 399 * within the bss section. So we don't overwrite it when the bss 400 * section gets cleared. 401 */ 402 if (!INITRD_START || !INITRD_SIZE) 403 return; 404 if (INITRD_START >= (unsigned long) __bss_stop) 405 return; 406 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE); 407 INITRD_START = (unsigned long) __bss_stop; 408 #endif 409 } 410 411 /* Set up boot command line */ 412 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 413 { 414 char *parm, *delim; 415 size_t rc, len; 416 417 len = strlen(boot_command_line); 418 419 delim = boot_command_line + len; /* '\0' character position */ 420 parm = boot_command_line + len + 1; /* append right after '\0' */ 421 422 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 423 if (rc) { 424 if (*parm == '=') 425 memmove(boot_command_line, parm + 1, rc); 426 else 427 *delim = ' '; /* replace '\0' with space */ 428 } 429 } 430 431 static void __init setup_boot_command_line(void) 432 { 433 int i; 434 435 /* convert arch command line to ascii */ 436 for (i = 0; i < ARCH_COMMAND_LINE_SIZE; i++) 437 if (COMMAND_LINE[i] & 0x80) 438 break; 439 if (i < ARCH_COMMAND_LINE_SIZE) 440 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 441 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE-1] = 0; 442 443 /* copy arch command line */ 444 strlcpy(boot_command_line, strstrip(COMMAND_LINE), 445 ARCH_COMMAND_LINE_SIZE); 446 447 /* append IPL PARM data to the boot command line */ 448 if (MACHINE_IS_VM) 449 append_to_cmdline(append_ipl_vmparm); 450 451 append_to_cmdline(append_ipl_scpdata); 452 } 453 454 455 /* 456 * Save ipl parameters, clear bss memory, initialize storage keys 457 * and create a kernel NSS at startup if the SAVESYS= parm is defined 458 */ 459 void __init startup_init(void) 460 { 461 reset_tod_clock(); 462 ipl_save_parameters(); 463 rescue_initrd(); 464 clear_bss_section(); 465 init_kernel_storage_key(); 466 lockdep_init(); 467 lockdep_off(); 468 sort_main_extable(); 469 setup_lowcore_early(); 470 setup_facility_list(); 471 detect_machine_type(); 472 ipl_update_parameters(); 473 setup_boot_command_line(); 474 create_kernel_nss(); 475 detect_mvpg(); 476 detect_ieee(); 477 detect_csp(); 478 detect_diag9c(); 479 detect_diag44(); 480 detect_machine_facilities(); 481 setup_hpage(); 482 sclp_facilities_detect(); 483 detect_memory_layout(memory_chunk); 484 #ifdef CONFIG_DYNAMIC_FTRACE 485 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; 486 #endif 487 lockdep_on(); 488 } 489