1 /* 2 * arch/s390/kernel/early.c 3 * 4 * Copyright IBM Corp. 2007 5 * Author(s): Hongjie Yang <hongjie@us.ibm.com>, 6 * Heiko Carstens <heiko.carstens@de.ibm.com> 7 */ 8 9 #include <linux/init.h> 10 #include <linux/errno.h> 11 #include <linux/string.h> 12 #include <linux/ctype.h> 13 #include <linux/lockdep.h> 14 #include <linux/module.h> 15 #include <linux/pfn.h> 16 #include <linux/uaccess.h> 17 #include <asm/ebcdic.h> 18 #include <asm/ipl.h> 19 #include <asm/lowcore.h> 20 #include <asm/processor.h> 21 #include <asm/sections.h> 22 #include <asm/setup.h> 23 #include <asm/cpcmd.h> 24 #include <asm/sclp.h> 25 #include "entry.h" 26 27 /* 28 * Create a Kernel NSS if the SAVESYS= parameter is defined 29 */ 30 #define DEFSYS_CMD_SIZE 128 31 #define SAVESYS_CMD_SIZE 32 32 33 char kernel_nss_name[NSS_NAME_SIZE + 1]; 34 35 static void __init setup_boot_command_line(void); 36 37 38 #ifdef CONFIG_SHARED_KERNEL 39 int __init savesys_ipl_nss(char *cmd, const int cmdlen); 40 41 asm( 42 " .section .init.text,\"ax\",@progbits\n" 43 " .align 4\n" 44 " .type savesys_ipl_nss, @function\n" 45 "savesys_ipl_nss:\n" 46 #ifdef CONFIG_64BIT 47 " stmg 6,15,48(15)\n" 48 " lgr 14,3\n" 49 " sam31\n" 50 " diag 2,14,0x8\n" 51 " sam64\n" 52 " lgr 2,14\n" 53 " lmg 6,15,48(15)\n" 54 #else 55 " stm 6,15,24(15)\n" 56 " lr 14,3\n" 57 " diag 2,14,0x8\n" 58 " lr 2,14\n" 59 " lm 6,15,24(15)\n" 60 #endif 61 " br 14\n" 62 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"); 63 64 static noinline __init void create_kernel_nss(void) 65 { 66 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; 67 #ifdef CONFIG_BLK_DEV_INITRD 68 unsigned int sinitrd_pfn, einitrd_pfn; 69 #endif 70 int response; 71 size_t len; 72 char *savesys_ptr; 73 char upper_command_line[COMMAND_LINE_SIZE]; 74 char defsys_cmd[DEFSYS_CMD_SIZE]; 75 char savesys_cmd[SAVESYS_CMD_SIZE]; 76 77 /* Do nothing if we are not running under VM */ 78 if (!MACHINE_IS_VM) 79 return; 80 81 /* Convert COMMAND_LINE to upper case */ 82 for (i = 0; i < strlen(boot_command_line); i++) 83 upper_command_line[i] = toupper(boot_command_line[i]); 84 85 savesys_ptr = strstr(upper_command_line, "SAVESYS="); 86 87 if (!savesys_ptr) 88 return; 89 90 savesys_ptr += 8; /* Point to the beginning of the NSS name */ 91 for (i = 0; i < NSS_NAME_SIZE; i++) { 92 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') 93 break; 94 kernel_nss_name[i] = savesys_ptr[i]; 95 } 96 97 stext_pfn = PFN_DOWN(__pa(&_stext)); 98 eshared_pfn = PFN_DOWN(__pa(&_eshared)); 99 end_pfn = PFN_UP(__pa(&_end)); 100 min_size = end_pfn << 2; 101 102 sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", 103 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1, 104 eshared_pfn, end_pfn); 105 106 #ifdef CONFIG_BLK_DEV_INITRD 107 if (INITRD_START && INITRD_SIZE) { 108 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); 109 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); 110 min_size = einitrd_pfn << 2; 111 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd, 112 sinitrd_pfn, einitrd_pfn); 113 } 114 #endif 115 116 sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13", 117 defsys_cmd, min_size); 118 sprintf(savesys_cmd, "SAVESYS %s \n IPL %s", 119 kernel_nss_name, kernel_nss_name); 120 121 __cpcmd(defsys_cmd, NULL, 0, &response); 122 123 if (response != 0) { 124 kernel_nss_name[0] = '\0'; 125 return; 126 } 127 128 len = strlen(savesys_cmd); 129 ASCEBC(savesys_cmd, len); 130 response = savesys_ipl_nss(savesys_cmd, len); 131 132 /* On success: response is equal to the command size, 133 * max SAVESYS_CMD_SIZE 134 * On error: response contains the numeric portion of cp error message. 135 * for SAVESYS it will be >= 263 136 */ 137 if (response > SAVESYS_CMD_SIZE) { 138 kernel_nss_name[0] = '\0'; 139 return; 140 } 141 142 /* re-setup boot command line with new ipl vm parms */ 143 ipl_update_parameters(); 144 setup_boot_command_line(); 145 146 ipl_flags = IPL_NSS_VALID; 147 } 148 149 #else /* CONFIG_SHARED_KERNEL */ 150 151 static inline void create_kernel_nss(void) { } 152 153 #endif /* CONFIG_SHARED_KERNEL */ 154 155 /* 156 * Clear bss memory 157 */ 158 static noinline __init void clear_bss_section(void) 159 { 160 memset(__bss_start, 0, __bss_stop - __bss_start); 161 } 162 163 /* 164 * Initialize storage key for kernel pages 165 */ 166 static noinline __init void init_kernel_storage_key(void) 167 { 168 unsigned long end_pfn, init_pfn; 169 170 end_pfn = PFN_UP(__pa(&_end)); 171 172 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 173 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY); 174 } 175 176 static noinline __init void detect_machine_type(void) 177 { 178 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data; 179 180 get_cpu_id(&S390_lowcore.cpu_data.cpu_id); 181 182 /* Running under z/VM ? */ 183 if (cpuinfo->cpu_id.version == 0xff) 184 machine_flags |= MACHINE_FLAG_VM; 185 186 /* Running under KVM ? */ 187 if (cpuinfo->cpu_id.version == 0xfe) 188 machine_flags |= MACHINE_FLAG_KVM; 189 } 190 191 static __init void early_pgm_check_handler(void) 192 { 193 unsigned long addr; 194 const struct exception_table_entry *fixup; 195 196 addr = S390_lowcore.program_old_psw.addr; 197 fixup = search_exception_tables(addr & PSW_ADDR_INSN); 198 if (!fixup) 199 disabled_wait(0); 200 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; 201 } 202 203 static noinline __init void setup_lowcore_early(void) 204 { 205 psw_t psw; 206 207 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 208 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 209 S390_lowcore.external_new_psw = psw; 210 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 211 S390_lowcore.program_new_psw = psw; 212 s390_base_pgm_handler_fn = early_pgm_check_handler; 213 } 214 215 static noinline __init void setup_hpage(void) 216 { 217 #ifndef CONFIG_DEBUG_PAGEALLOC 218 unsigned int facilities; 219 220 facilities = stfl(); 221 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29))) 222 return; 223 machine_flags |= MACHINE_FLAG_HPAGE; 224 __ctl_set_bit(0, 23); 225 #endif 226 } 227 228 static __init void detect_mvpg(void) 229 { 230 #ifndef CONFIG_64BIT 231 int rc; 232 233 asm volatile( 234 " la 0,0\n" 235 " mvpg %2,%2\n" 236 "0: la %0,0\n" 237 "1:\n" 238 EX_TABLE(0b,1b) 239 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 240 if (!rc) 241 machine_flags |= MACHINE_FLAG_MVPG; 242 #endif 243 } 244 245 static __init void detect_ieee(void) 246 { 247 #ifndef CONFIG_64BIT 248 int rc, tmp; 249 250 asm volatile( 251 " efpc %1,0\n" 252 "0: la %0,0\n" 253 "1:\n" 254 EX_TABLE(0b,1b) 255 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 256 if (!rc) 257 machine_flags |= MACHINE_FLAG_IEEE; 258 #endif 259 } 260 261 static __init void detect_csp(void) 262 { 263 #ifndef CONFIG_64BIT 264 int rc; 265 266 asm volatile( 267 " la 0,0\n" 268 " la 1,0\n" 269 " la 2,4\n" 270 " csp 0,2\n" 271 "0: la %0,0\n" 272 "1:\n" 273 EX_TABLE(0b,1b) 274 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 275 if (!rc) 276 machine_flags |= MACHINE_FLAG_CSP; 277 #endif 278 } 279 280 static __init void detect_diag9c(void) 281 { 282 unsigned int cpu_address; 283 int rc; 284 285 cpu_address = stap(); 286 asm volatile( 287 " diag %2,0,0x9c\n" 288 "0: la %0,0\n" 289 "1:\n" 290 EX_TABLE(0b,1b) 291 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 292 if (!rc) 293 machine_flags |= MACHINE_FLAG_DIAG9C; 294 } 295 296 static __init void detect_diag44(void) 297 { 298 #ifdef CONFIG_64BIT 299 int rc; 300 301 asm volatile( 302 " diag 0,0,0x44\n" 303 "0: la %0,0\n" 304 "1:\n" 305 EX_TABLE(0b,1b) 306 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 307 if (!rc) 308 machine_flags |= MACHINE_FLAG_DIAG44; 309 #endif 310 } 311 312 static __init void detect_machine_facilities(void) 313 { 314 #ifdef CONFIG_64BIT 315 unsigned int facilities; 316 317 facilities = stfl(); 318 if (facilities & (1 << 28)) 319 machine_flags |= MACHINE_FLAG_IDTE; 320 if (facilities & (1 << 23)) 321 machine_flags |= MACHINE_FLAG_PFMF; 322 if (facilities & (1 << 4)) 323 machine_flags |= MACHINE_FLAG_MVCOS; 324 #endif 325 } 326 327 static __init void rescue_initrd(void) 328 { 329 #ifdef CONFIG_BLK_DEV_INITRD 330 /* 331 * Move the initrd right behind the bss section in case it starts 332 * within the bss section. So we don't overwrite it when the bss 333 * section gets cleared. 334 */ 335 if (!INITRD_START || !INITRD_SIZE) 336 return; 337 if (INITRD_START >= (unsigned long) __bss_stop) 338 return; 339 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE); 340 INITRD_START = (unsigned long) __bss_stop; 341 #endif 342 } 343 344 /* Set up boot command line */ 345 static void __init setup_boot_command_line(void) 346 { 347 char *parm = NULL; 348 349 /* copy arch command line */ 350 strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 351 boot_command_line[ARCH_COMMAND_LINE_SIZE - 1] = 0; 352 353 /* append IPL PARM data to the boot command line */ 354 if (MACHINE_IS_VM) { 355 parm = boot_command_line + strlen(boot_command_line); 356 *parm++ = ' '; 357 get_ipl_vmparm(parm); 358 if (parm[0] == '=') 359 memmove(boot_command_line, parm + 1, strlen(parm)); 360 } 361 } 362 363 364 /* 365 * Save ipl parameters, clear bss memory, initialize storage keys 366 * and create a kernel NSS at startup if the SAVESYS= parm is defined 367 */ 368 void __init startup_init(void) 369 { 370 ipl_save_parameters(); 371 rescue_initrd(); 372 clear_bss_section(); 373 init_kernel_storage_key(); 374 lockdep_init(); 375 lockdep_off(); 376 sort_main_extable(); 377 setup_lowcore_early(); 378 detect_machine_type(); 379 ipl_update_parameters(); 380 setup_boot_command_line(); 381 create_kernel_nss(); 382 detect_mvpg(); 383 detect_ieee(); 384 detect_csp(); 385 detect_diag9c(); 386 detect_diag44(); 387 detect_machine_facilities(); 388 setup_hpage(); 389 sclp_facilities_detect(); 390 detect_memory_layout(memory_chunk); 391 lockdep_on(); 392 } 393