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, PAGE_DEFAULT_KEY); 212 } 213 214 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); 215 216 static noinline __init void detect_machine_type(void) 217 { 218 /* Check current-configuration-level */ 219 if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) { 220 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 221 return; 222 } 223 /* Get virtual-machine cpu information. */ 224 if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count) 225 return; 226 227 /* Running under KVM? If not we assume z/VM */ 228 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) 229 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 230 else 231 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 232 } 233 234 static __init void early_pgm_check_handler(void) 235 { 236 unsigned long addr; 237 const struct exception_table_entry *fixup; 238 239 addr = S390_lowcore.program_old_psw.addr; 240 fixup = search_exception_tables(addr & PSW_ADDR_INSN); 241 if (!fixup) 242 disabled_wait(0); 243 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; 244 } 245 246 static noinline __init void setup_lowcore_early(void) 247 { 248 psw_t psw; 249 250 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 251 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 252 S390_lowcore.external_new_psw = psw; 253 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 254 S390_lowcore.program_new_psw = psw; 255 s390_base_pgm_handler_fn = early_pgm_check_handler; 256 } 257 258 static noinline __init void setup_hpage(void) 259 { 260 #ifndef CONFIG_DEBUG_PAGEALLOC 261 unsigned int facilities; 262 263 facilities = stfl(); 264 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29))) 265 return; 266 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE; 267 __ctl_set_bit(0, 23); 268 #endif 269 } 270 271 static __init void detect_mvpg(void) 272 { 273 #ifndef CONFIG_64BIT 274 int rc; 275 276 asm volatile( 277 " la 0,0\n" 278 " mvpg %2,%2\n" 279 "0: la %0,0\n" 280 "1:\n" 281 EX_TABLE(0b,1b) 282 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 283 if (!rc) 284 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; 285 #endif 286 } 287 288 static __init void detect_ieee(void) 289 { 290 #ifndef CONFIG_64BIT 291 int rc, tmp; 292 293 asm volatile( 294 " efpc %1,0\n" 295 "0: la %0,0\n" 296 "1:\n" 297 EX_TABLE(0b,1b) 298 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 299 if (!rc) 300 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; 301 #endif 302 } 303 304 static __init void detect_csp(void) 305 { 306 #ifndef CONFIG_64BIT 307 int rc; 308 309 asm volatile( 310 " la 0,0\n" 311 " la 1,0\n" 312 " la 2,4\n" 313 " csp 0,2\n" 314 "0: la %0,0\n" 315 "1:\n" 316 EX_TABLE(0b,1b) 317 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 318 if (!rc) 319 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; 320 #endif 321 } 322 323 static __init void detect_diag9c(void) 324 { 325 unsigned int cpu_address; 326 int rc; 327 328 cpu_address = stap(); 329 asm volatile( 330 " diag %2,0,0x9c\n" 331 "0: la %0,0\n" 332 "1:\n" 333 EX_TABLE(0b,1b) 334 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 335 if (!rc) 336 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 337 } 338 339 static __init void detect_diag44(void) 340 { 341 #ifdef CONFIG_64BIT 342 int rc; 343 344 asm volatile( 345 " diag 0,0,0x44\n" 346 "0: la %0,0\n" 347 "1:\n" 348 EX_TABLE(0b,1b) 349 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 350 if (!rc) 351 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 352 #endif 353 } 354 355 static __init void detect_machine_facilities(void) 356 { 357 #ifdef CONFIG_64BIT 358 unsigned int facilities; 359 unsigned long long facility_bits; 360 361 facilities = stfl(); 362 if (facilities & (1 << 28)) 363 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 364 if (facilities & (1 << 23)) 365 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF; 366 if (facilities & (1 << 4)) 367 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; 368 if ((stfle(&facility_bits, 1) > 0) && 369 (facility_bits & (1ULL << (63 - 40)))) 370 S390_lowcore.machine_flags |= MACHINE_FLAG_SPP; 371 #endif 372 } 373 374 static __init void rescue_initrd(void) 375 { 376 #ifdef CONFIG_BLK_DEV_INITRD 377 /* 378 * Move the initrd right behind the bss section in case it starts 379 * within the bss section. So we don't overwrite it when the bss 380 * section gets cleared. 381 */ 382 if (!INITRD_START || !INITRD_SIZE) 383 return; 384 if (INITRD_START >= (unsigned long) __bss_stop) 385 return; 386 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE); 387 INITRD_START = (unsigned long) __bss_stop; 388 #endif 389 } 390 391 /* Set up boot command line */ 392 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 393 { 394 char *parm, *delim; 395 size_t rc, len; 396 397 len = strlen(boot_command_line); 398 399 delim = boot_command_line + len; /* '\0' character position */ 400 parm = boot_command_line + len + 1; /* append right after '\0' */ 401 402 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 403 if (rc) { 404 if (*parm == '=') 405 memmove(boot_command_line, parm + 1, rc); 406 else 407 *delim = ' '; /* replace '\0' with space */ 408 } 409 } 410 411 static void __init setup_boot_command_line(void) 412 { 413 int i; 414 415 /* convert arch command line to ascii */ 416 for (i = 0; i < ARCH_COMMAND_LINE_SIZE; i++) 417 if (COMMAND_LINE[i] & 0x80) 418 break; 419 if (i < ARCH_COMMAND_LINE_SIZE) 420 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 421 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE-1] = 0; 422 423 /* copy arch command line */ 424 strlcpy(boot_command_line, strstrip(COMMAND_LINE), 425 ARCH_COMMAND_LINE_SIZE); 426 427 /* append IPL PARM data to the boot command line */ 428 if (MACHINE_IS_VM) 429 append_to_cmdline(append_ipl_vmparm); 430 431 append_to_cmdline(append_ipl_scpdata); 432 } 433 434 435 /* 436 * Save ipl parameters, clear bss memory, initialize storage keys 437 * and create a kernel NSS at startup if the SAVESYS= parm is defined 438 */ 439 void __init startup_init(void) 440 { 441 reset_tod_clock(); 442 ipl_save_parameters(); 443 rescue_initrd(); 444 clear_bss_section(); 445 init_kernel_storage_key(); 446 lockdep_init(); 447 lockdep_off(); 448 sort_main_extable(); 449 setup_lowcore_early(); 450 detect_machine_type(); 451 ipl_update_parameters(); 452 setup_boot_command_line(); 453 create_kernel_nss(); 454 detect_mvpg(); 455 detect_ieee(); 456 detect_csp(); 457 detect_diag9c(); 458 detect_diag44(); 459 detect_machine_facilities(); 460 setup_hpage(); 461 sclp_facilities_detect(); 462 detect_memory_layout(memory_chunk); 463 #ifdef CONFIG_DYNAMIC_FTRACE 464 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; 465 #endif 466 lockdep_on(); 467 } 468