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 /* No VM information? Looks like LPAR */ 218 if (stsi(&vmms, 3, 2, 2) == -ENOSYS) 219 return; 220 if (!vmms.count) 221 return; 222 223 /* Running under KVM? If not we assume z/VM */ 224 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) 225 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 226 else 227 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 228 } 229 230 static __init void early_pgm_check_handler(void) 231 { 232 unsigned long addr; 233 const struct exception_table_entry *fixup; 234 235 addr = S390_lowcore.program_old_psw.addr; 236 fixup = search_exception_tables(addr & PSW_ADDR_INSN); 237 if (!fixup) 238 disabled_wait(0); 239 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; 240 } 241 242 static noinline __init void setup_lowcore_early(void) 243 { 244 psw_t psw; 245 246 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 247 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 248 S390_lowcore.external_new_psw = psw; 249 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 250 S390_lowcore.program_new_psw = psw; 251 s390_base_pgm_handler_fn = early_pgm_check_handler; 252 } 253 254 static noinline __init void setup_hpage(void) 255 { 256 #ifndef CONFIG_DEBUG_PAGEALLOC 257 unsigned int facilities; 258 259 facilities = stfl(); 260 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29))) 261 return; 262 S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE; 263 __ctl_set_bit(0, 23); 264 #endif 265 } 266 267 static __init void detect_mvpg(void) 268 { 269 #ifndef CONFIG_64BIT 270 int rc; 271 272 asm volatile( 273 " la 0,0\n" 274 " mvpg %2,%2\n" 275 "0: la %0,0\n" 276 "1:\n" 277 EX_TABLE(0b,1b) 278 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 279 if (!rc) 280 S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG; 281 #endif 282 } 283 284 static __init void detect_ieee(void) 285 { 286 #ifndef CONFIG_64BIT 287 int rc, tmp; 288 289 asm volatile( 290 " efpc %1,0\n" 291 "0: la %0,0\n" 292 "1:\n" 293 EX_TABLE(0b,1b) 294 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 295 if (!rc) 296 S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE; 297 #endif 298 } 299 300 static __init void detect_csp(void) 301 { 302 #ifndef CONFIG_64BIT 303 int rc; 304 305 asm volatile( 306 " la 0,0\n" 307 " la 1,0\n" 308 " la 2,4\n" 309 " csp 0,2\n" 310 "0: la %0,0\n" 311 "1:\n" 312 EX_TABLE(0b,1b) 313 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 314 if (!rc) 315 S390_lowcore.machine_flags |= MACHINE_FLAG_CSP; 316 #endif 317 } 318 319 static __init void detect_diag9c(void) 320 { 321 unsigned int cpu_address; 322 int rc; 323 324 cpu_address = stap(); 325 asm volatile( 326 " diag %2,0,0x9c\n" 327 "0: la %0,0\n" 328 "1:\n" 329 EX_TABLE(0b,1b) 330 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 331 if (!rc) 332 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 333 } 334 335 static __init void detect_diag44(void) 336 { 337 #ifdef CONFIG_64BIT 338 int rc; 339 340 asm volatile( 341 " diag 0,0,0x44\n" 342 "0: la %0,0\n" 343 "1:\n" 344 EX_TABLE(0b,1b) 345 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 346 if (!rc) 347 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 348 #endif 349 } 350 351 static __init void detect_machine_facilities(void) 352 { 353 #ifdef CONFIG_64BIT 354 unsigned int facilities; 355 356 facilities = stfl(); 357 if (facilities & (1 << 28)) 358 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 359 if (facilities & (1 << 23)) 360 S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF; 361 if (facilities & (1 << 4)) 362 S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; 363 #endif 364 } 365 366 static __init void rescue_initrd(void) 367 { 368 #ifdef CONFIG_BLK_DEV_INITRD 369 /* 370 * Move the initrd right behind the bss section in case it starts 371 * within the bss section. So we don't overwrite it when the bss 372 * section gets cleared. 373 */ 374 if (!INITRD_START || !INITRD_SIZE) 375 return; 376 if (INITRD_START >= (unsigned long) __bss_stop) 377 return; 378 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE); 379 INITRD_START = (unsigned long) __bss_stop; 380 #endif 381 } 382 383 /* Set up boot command line */ 384 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 385 { 386 char *parm, *delim; 387 size_t rc, len; 388 389 len = strlen(boot_command_line); 390 391 delim = boot_command_line + len; /* '\0' character position */ 392 parm = boot_command_line + len + 1; /* append right after '\0' */ 393 394 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 395 if (rc) { 396 if (*parm == '=') 397 memmove(boot_command_line, parm + 1, rc); 398 else 399 *delim = ' '; /* replace '\0' with space */ 400 } 401 } 402 403 static void __init setup_boot_command_line(void) 404 { 405 /* copy arch command line */ 406 strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 407 408 /* append IPL PARM data to the boot command line */ 409 if (MACHINE_IS_VM) 410 append_to_cmdline(append_ipl_vmparm); 411 412 append_to_cmdline(append_ipl_scpdata); 413 } 414 415 416 /* 417 * Save ipl parameters, clear bss memory, initialize storage keys 418 * and create a kernel NSS at startup if the SAVESYS= parm is defined 419 */ 420 void __init startup_init(void) 421 { 422 reset_tod_clock(); 423 ipl_save_parameters(); 424 rescue_initrd(); 425 clear_bss_section(); 426 init_kernel_storage_key(); 427 lockdep_init(); 428 lockdep_off(); 429 sort_main_extable(); 430 setup_lowcore_early(); 431 detect_machine_type(); 432 ipl_update_parameters(); 433 setup_boot_command_line(); 434 create_kernel_nss(); 435 detect_mvpg(); 436 detect_ieee(); 437 detect_csp(); 438 detect_diag9c(); 439 detect_diag44(); 440 detect_machine_facilities(); 441 setup_hpage(); 442 sclp_facilities_detect(); 443 detect_memory_layout(memory_chunk); 444 #ifdef CONFIG_DYNAMIC_FTRACE 445 S390_lowcore.ftrace_func = (unsigned long)ftrace_caller; 446 #endif 447 lockdep_on(); 448 } 449