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 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 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 sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", 127 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1, 128 eshared_pfn, end_pfn); 129 130 #ifdef CONFIG_BLK_DEV_INITRD 131 if (INITRD_START && INITRD_SIZE) { 132 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); 133 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); 134 min_size = einitrd_pfn << 2; 135 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd, 136 sinitrd_pfn, einitrd_pfn); 137 } 138 #endif 139 140 sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13", 141 defsys_cmd, min_size); 142 sprintf(savesys_cmd, "SAVESYS %s \n IPL %s", 143 kernel_nss_name, kernel_nss_name); 144 145 __cpcmd(defsys_cmd, NULL, 0, &response); 146 147 if (response != 0) { 148 pr_err("Defining the Linux kernel NSS failed with rc=%d\n", 149 response); 150 kernel_nss_name[0] = '\0'; 151 return; 152 } 153 154 len = strlen(savesys_cmd); 155 ASCEBC(savesys_cmd, len); 156 response = savesys_ipl_nss(savesys_cmd, len); 157 158 /* On success: response is equal to the command size, 159 * max SAVESYS_CMD_SIZE 160 * On error: response contains the numeric portion of cp error message. 161 * for SAVESYS it will be >= 263 162 * for missing privilege class, it will be 1 163 */ 164 if (response > SAVESYS_CMD_SIZE || response == 1) { 165 pr_err("Saving the Linux kernel NSS failed with rc=%d\n", 166 response); 167 kernel_nss_name[0] = '\0'; 168 return; 169 } 170 171 /* re-initialize cputime accounting. */ 172 sched_clock_base_cc = get_clock(); 173 S390_lowcore.last_update_clock = sched_clock_base_cc; 174 S390_lowcore.last_update_timer = 0x7fffffffffffffffULL; 175 S390_lowcore.user_timer = 0; 176 S390_lowcore.system_timer = 0; 177 asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer)); 178 179 /* re-setup boot command line with new ipl vm parms */ 180 ipl_update_parameters(); 181 setup_boot_command_line(); 182 183 ipl_flags = IPL_NSS_VALID; 184 } 185 186 #else /* CONFIG_SHARED_KERNEL */ 187 188 static inline void create_kernel_nss(void) { } 189 190 #endif /* CONFIG_SHARED_KERNEL */ 191 192 /* 193 * Clear bss memory 194 */ 195 static noinline __init void clear_bss_section(void) 196 { 197 memset(__bss_start, 0, __bss_stop - __bss_start); 198 } 199 200 /* 201 * Initialize storage key for kernel pages 202 */ 203 static noinline __init void init_kernel_storage_key(void) 204 { 205 unsigned long end_pfn, init_pfn; 206 207 end_pfn = PFN_UP(__pa(&_end)); 208 209 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 210 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY); 211 } 212 213 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); 214 215 static noinline __init void detect_machine_type(void) 216 { 217 /* Check current-configuration-level */ 218 if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) { 219 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 220 return; 221 } 222 /* Get virtual-machine cpu information. */ 223 if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count) 224 return; 225 226 /* Running under KVM? If not we assume z/VM */ 227 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) 228 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 229 else 230 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 231 } 232 233 static __init void early_pgm_check_handler(void) 234 { 235 unsigned long addr; 236 const struct exception_table_entry *fixup; 237 238 addr = S390_lowcore.program_old_psw.addr; 239 fixup = search_exception_tables(addr & PSW_ADDR_INSN); 240 if (!fixup) 241 disabled_wait(0); 242 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; 243 } 244 245 static noinline __init void setup_lowcore_early(void) 246 { 247 psw_t psw; 248 249 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 250 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 251 S390_lowcore.external_new_psw = psw; 252 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 253 S390_lowcore.program_new_psw = psw; 254 s390_base_pgm_handler_fn = early_pgm_check_handler; 255 } 256 257 static noinline __init void setup_hpage(void) 258 { 259 #ifndef CONFIG_DEBUG_PAGEALLOC 260 unsigned int facilities; 261 262 facilities = stfl(); 263 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29))) 264 return; 265 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE; 266 __ctl_set_bit(0, 23); 267 #endif 268 } 269 270 static __init void detect_mvpg(void) 271 { 272 #ifndef CONFIG_64BIT 273 int rc; 274 275 asm volatile( 276 " la 0,0\n" 277 " mvpg %2,%2\n" 278 "0: la %0,0\n" 279 "1:\n" 280 EX_TABLE(0b,1b) 281 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 282 if (!rc) 283 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; 284 #endif 285 } 286 287 static __init void detect_ieee(void) 288 { 289 #ifndef CONFIG_64BIT 290 int rc, tmp; 291 292 asm volatile( 293 " efpc %1,0\n" 294 "0: la %0,0\n" 295 "1:\n" 296 EX_TABLE(0b,1b) 297 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 298 if (!rc) 299 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; 300 #endif 301 } 302 303 static __init void detect_csp(void) 304 { 305 #ifndef CONFIG_64BIT 306 int rc; 307 308 asm volatile( 309 " la 0,0\n" 310 " la 1,0\n" 311 " la 2,4\n" 312 " csp 0,2\n" 313 "0: la %0,0\n" 314 "1:\n" 315 EX_TABLE(0b,1b) 316 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 317 if (!rc) 318 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; 319 #endif 320 } 321 322 static __init void detect_diag9c(void) 323 { 324 unsigned int cpu_address; 325 int rc; 326 327 cpu_address = stap(); 328 asm volatile( 329 " diag %2,0,0x9c\n" 330 "0: la %0,0\n" 331 "1:\n" 332 EX_TABLE(0b,1b) 333 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 334 if (!rc) 335 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 336 } 337 338 static __init void detect_diag44(void) 339 { 340 #ifdef CONFIG_64BIT 341 int rc; 342 343 asm volatile( 344 " diag 0,0,0x44\n" 345 "0: la %0,0\n" 346 "1:\n" 347 EX_TABLE(0b,1b) 348 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 349 if (!rc) 350 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 351 #endif 352 } 353 354 static __init void detect_machine_facilities(void) 355 { 356 #ifdef CONFIG_64BIT 357 unsigned int facilities; 358 359 facilities = stfl(); 360 if (facilities & (1 << 28)) 361 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 362 if (facilities & (1 << 23)) 363 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF; 364 if (facilities & (1 << 4)) 365 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; 366 #endif 367 } 368 369 static __init void rescue_initrd(void) 370 { 371 #ifdef CONFIG_BLK_DEV_INITRD 372 /* 373 * Move the initrd right behind the bss section in case it starts 374 * within the bss section. So we don't overwrite it when the bss 375 * section gets cleared. 376 */ 377 if (!INITRD_START || !INITRD_SIZE) 378 return; 379 if (INITRD_START >= (unsigned long) __bss_stop) 380 return; 381 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE); 382 INITRD_START = (unsigned long) __bss_stop; 383 #endif 384 } 385 386 /* Set up boot command line */ 387 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 388 { 389 char *parm, *delim; 390 size_t rc, len; 391 392 len = strlen(boot_command_line); 393 394 delim = boot_command_line + len; /* '\0' character position */ 395 parm = boot_command_line + len + 1; /* append right after '\0' */ 396 397 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 398 if (rc) { 399 if (*parm == '=') 400 memmove(boot_command_line, parm + 1, rc); 401 else 402 *delim = ' '; /* replace '\0' with space */ 403 } 404 } 405 406 static void __init setup_boot_command_line(void) 407 { 408 int i; 409 410 /* convert arch command line to ascii */ 411 for (i = 0; i < ARCH_COMMAND_LINE_SIZE; i++) 412 if (COMMAND_LINE[i] & 0x80) 413 break; 414 if (i < ARCH_COMMAND_LINE_SIZE) 415 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 416 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE-1] = 0; 417 418 /* copy arch command line */ 419 strlcpy(boot_command_line, strstrip(COMMAND_LINE), 420 ARCH_COMMAND_LINE_SIZE); 421 422 /* append IPL PARM data to the boot command line */ 423 if (MACHINE_IS_VM) 424 append_to_cmdline(append_ipl_vmparm); 425 426 append_to_cmdline(append_ipl_scpdata); 427 } 428 429 430 /* 431 * Save ipl parameters, clear bss memory, initialize storage keys 432 * and create a kernel NSS at startup if the SAVESYS= parm is defined 433 */ 434 void __init startup_init(void) 435 { 436 reset_tod_clock(); 437 ipl_save_parameters(); 438 rescue_initrd(); 439 clear_bss_section(); 440 init_kernel_storage_key(); 441 lockdep_init(); 442 lockdep_off(); 443 sort_main_extable(); 444 setup_lowcore_early(); 445 detect_machine_type(); 446 ipl_update_parameters(); 447 setup_boot_command_line(); 448 create_kernel_nss(); 449 detect_mvpg(); 450 detect_ieee(); 451 detect_csp(); 452 detect_diag9c(); 453 detect_diag44(); 454 detect_machine_facilities(); 455 setup_hpage(); 456 sclp_facilities_detect(); 457 detect_memory_layout(memory_chunk); 458 #ifdef CONFIG_DYNAMIC_FTRACE 459 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; 460 #endif 461 lockdep_on(); 462 } 463