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_clock(&time) == 0) 51 return; 52 /* TOD clock not running. Set the clock to Unix Epoch. */ 53 if (set_clock(TOD_UNIX_EPOCH) != 0 || store_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_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 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 } 217 218 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); 219 220 static noinline __init void detect_machine_type(void) 221 { 222 /* Check current-configuration-level */ 223 if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) { 224 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 225 return; 226 } 227 /* Get virtual-machine cpu information. */ 228 if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count) 229 return; 230 231 /* Running under KVM? If not we assume z/VM */ 232 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) 233 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 234 else 235 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 236 } 237 238 static void early_pgm_check_handler(void) 239 { 240 unsigned long addr; 241 const struct exception_table_entry *fixup; 242 243 addr = S390_lowcore.program_old_psw.addr; 244 fixup = search_exception_tables(addr & PSW_ADDR_INSN); 245 if (!fixup) 246 disabled_wait(0); 247 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; 248 } 249 250 static noinline __init void setup_lowcore_early(void) 251 { 252 psw_t psw; 253 254 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; 255 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 256 S390_lowcore.external_new_psw = psw; 257 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 258 S390_lowcore.program_new_psw = psw; 259 s390_base_pgm_handler_fn = early_pgm_check_handler; 260 } 261 262 static noinline __init void setup_facility_list(void) 263 { 264 stfle(S390_lowcore.stfle_fac_list, 265 ARRAY_SIZE(S390_lowcore.stfle_fac_list)); 266 } 267 268 static noinline __init void setup_hpage(void) 269 { 270 #ifndef CONFIG_DEBUG_PAGEALLOC 271 if (!test_facility(2) || !test_facility(8)) 272 return; 273 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE; 274 __ctl_set_bit(0, 23); 275 #endif 276 } 277 278 static __init void detect_mvpg(void) 279 { 280 #ifndef CONFIG_64BIT 281 int rc; 282 283 asm volatile( 284 " la 0,0\n" 285 " mvpg %2,%2\n" 286 "0: la %0,0\n" 287 "1:\n" 288 EX_TABLE(0b,1b) 289 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 290 if (!rc) 291 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; 292 #endif 293 } 294 295 static __init void detect_ieee(void) 296 { 297 #ifndef CONFIG_64BIT 298 int rc, tmp; 299 300 asm volatile( 301 " efpc %1,0\n" 302 "0: la %0,0\n" 303 "1:\n" 304 EX_TABLE(0b,1b) 305 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 306 if (!rc) 307 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; 308 #endif 309 } 310 311 static __init void detect_csp(void) 312 { 313 #ifndef CONFIG_64BIT 314 int rc; 315 316 asm volatile( 317 " la 0,0\n" 318 " la 1,0\n" 319 " la 2,4\n" 320 " csp 0,2\n" 321 "0: la %0,0\n" 322 "1:\n" 323 EX_TABLE(0b,1b) 324 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 325 if (!rc) 326 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; 327 #endif 328 } 329 330 static __init void detect_diag9c(void) 331 { 332 unsigned int cpu_address; 333 int rc; 334 335 cpu_address = stap(); 336 asm volatile( 337 " diag %2,0,0x9c\n" 338 "0: la %0,0\n" 339 "1:\n" 340 EX_TABLE(0b,1b) 341 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 342 if (!rc) 343 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 344 } 345 346 static __init void detect_diag44(void) 347 { 348 #ifdef CONFIG_64BIT 349 int rc; 350 351 asm volatile( 352 " diag 0,0,0x44\n" 353 "0: la %0,0\n" 354 "1:\n" 355 EX_TABLE(0b,1b) 356 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 357 if (!rc) 358 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 359 #endif 360 } 361 362 static __init void detect_machine_facilities(void) 363 { 364 #ifdef CONFIG_64BIT 365 if (test_facility(3)) 366 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 367 if (test_facility(8)) 368 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF; 369 if (test_facility(11)) 370 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 371 if (test_facility(27)) 372 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; 373 if (test_facility(40)) 374 S390_lowcore.machine_flags |= MACHINE_FLAG_SPP; 375 #endif 376 } 377 378 static __init void rescue_initrd(void) 379 { 380 #ifdef CONFIG_BLK_DEV_INITRD 381 unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20); 382 /* 383 * Just like in case of IPL from VM reader we make sure there is a 384 * gap of 4MB between end of kernel and start of initrd. 385 * That way we can also be sure that saving an NSS will succeed, 386 * which however only requires different segments. 387 */ 388 if (!INITRD_START || !INITRD_SIZE) 389 return; 390 if (INITRD_START >= min_initrd_addr) 391 return; 392 memmove((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE); 393 INITRD_START = min_initrd_addr; 394 #endif 395 } 396 397 /* Set up boot command line */ 398 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 399 { 400 char *parm, *delim; 401 size_t rc, len; 402 403 len = strlen(boot_command_line); 404 405 delim = boot_command_line + len; /* '\0' character position */ 406 parm = boot_command_line + len + 1; /* append right after '\0' */ 407 408 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 409 if (rc) { 410 if (*parm == '=') 411 memmove(boot_command_line, parm + 1, rc); 412 else 413 *delim = ' '; /* replace '\0' with space */ 414 } 415 } 416 417 static inline int has_ebcdic_char(const char *str) 418 { 419 int i; 420 421 for (i = 0; str[i]; i++) 422 if (str[i] & 0x80) 423 return 1; 424 return 0; 425 } 426 427 static void __init setup_boot_command_line(void) 428 { 429 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; 430 /* convert arch command line to ascii if necessary */ 431 if (has_ebcdic_char(COMMAND_LINE)) 432 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 433 /* copy arch command line */ 434 strlcpy(boot_command_line, strstrip(COMMAND_LINE), 435 ARCH_COMMAND_LINE_SIZE); 436 437 /* append IPL PARM data to the boot command line */ 438 if (MACHINE_IS_VM) 439 append_to_cmdline(append_ipl_vmparm); 440 441 append_to_cmdline(append_ipl_scpdata); 442 } 443 444 445 /* 446 * Save ipl parameters, clear bss memory, initialize storage keys 447 * and create a kernel NSS at startup if the SAVESYS= parm is defined 448 */ 449 void __init startup_init(void) 450 { 451 reset_tod_clock(); 452 ipl_save_parameters(); 453 rescue_initrd(); 454 clear_bss_section(); 455 init_kernel_storage_key(); 456 lockdep_init(); 457 lockdep_off(); 458 setup_lowcore_early(); 459 setup_facility_list(); 460 detect_machine_type(); 461 ipl_update_parameters(); 462 setup_boot_command_line(); 463 create_kernel_nss(); 464 detect_mvpg(); 465 detect_ieee(); 466 detect_csp(); 467 detect_diag9c(); 468 detect_diag44(); 469 detect_machine_facilities(); 470 setup_hpage(); 471 sclp_facilities_detect(); 472 detect_memory_layout(memory_chunk); 473 #ifdef CONFIG_DYNAMIC_FTRACE 474 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; 475 #endif 476 lockdep_on(); 477 } 478