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/compiler.h> 10 #include <linux/init.h> 11 #include <linux/errno.h> 12 #include <linux/string.h> 13 #include <linux/ctype.h> 14 #include <linux/lockdep.h> 15 #include <linux/module.h> 16 #include <linux/pfn.h> 17 #include <linux/uaccess.h> 18 #include <asm/ebcdic.h> 19 #include <asm/ipl.h> 20 #include <asm/lowcore.h> 21 #include <asm/processor.h> 22 #include <asm/sections.h> 23 #include <asm/setup.h> 24 #include <asm/sysinfo.h> 25 #include <asm/cpcmd.h> 26 #include <asm/sclp.h> 27 #include "entry.h" 28 29 /* 30 * Create a Kernel NSS if the SAVESYS= parameter is defined 31 */ 32 #define DEFSYS_CMD_SIZE 128 33 #define SAVESYS_CMD_SIZE 32 34 35 char kernel_nss_name[NSS_NAME_SIZE + 1]; 36 37 static void __init setup_boot_command_line(void); 38 39 40 #ifdef CONFIG_SHARED_KERNEL 41 int __init savesys_ipl_nss(char *cmd, const int cmdlen); 42 43 asm( 44 " .section .init.text,\"ax\",@progbits\n" 45 " .align 4\n" 46 " .type savesys_ipl_nss, @function\n" 47 "savesys_ipl_nss:\n" 48 #ifdef CONFIG_64BIT 49 " stmg 6,15,48(15)\n" 50 " lgr 14,3\n" 51 " sam31\n" 52 " diag 2,14,0x8\n" 53 " sam64\n" 54 " lgr 2,14\n" 55 " lmg 6,15,48(15)\n" 56 #else 57 " stm 6,15,24(15)\n" 58 " lr 14,3\n" 59 " diag 2,14,0x8\n" 60 " lr 2,14\n" 61 " lm 6,15,24(15)\n" 62 #endif 63 " br 14\n" 64 " .size savesys_ipl_nss, .-savesys_ipl_nss\n"); 65 66 static noinline __init void create_kernel_nss(void) 67 { 68 unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size; 69 #ifdef CONFIG_BLK_DEV_INITRD 70 unsigned int sinitrd_pfn, einitrd_pfn; 71 #endif 72 int response; 73 size_t len; 74 char *savesys_ptr; 75 char upper_command_line[COMMAND_LINE_SIZE]; 76 char defsys_cmd[DEFSYS_CMD_SIZE]; 77 char savesys_cmd[SAVESYS_CMD_SIZE]; 78 79 /* Do nothing if we are not running under VM */ 80 if (!MACHINE_IS_VM) 81 return; 82 83 /* Convert COMMAND_LINE to upper case */ 84 for (i = 0; i < strlen(boot_command_line); i++) 85 upper_command_line[i] = toupper(boot_command_line[i]); 86 87 savesys_ptr = strstr(upper_command_line, "SAVESYS="); 88 89 if (!savesys_ptr) 90 return; 91 92 savesys_ptr += 8; /* Point to the beginning of the NSS name */ 93 for (i = 0; i < NSS_NAME_SIZE; i++) { 94 if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0') 95 break; 96 kernel_nss_name[i] = savesys_ptr[i]; 97 } 98 99 stext_pfn = PFN_DOWN(__pa(&_stext)); 100 eshared_pfn = PFN_DOWN(__pa(&_eshared)); 101 end_pfn = PFN_UP(__pa(&_end)); 102 min_size = end_pfn << 2; 103 104 sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X", 105 kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1, 106 eshared_pfn, end_pfn); 107 108 #ifdef CONFIG_BLK_DEV_INITRD 109 if (INITRD_START && INITRD_SIZE) { 110 sinitrd_pfn = PFN_DOWN(__pa(INITRD_START)); 111 einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE)); 112 min_size = einitrd_pfn << 2; 113 sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd, 114 sinitrd_pfn, einitrd_pfn); 115 } 116 #endif 117 118 sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13", 119 defsys_cmd, min_size); 120 sprintf(savesys_cmd, "SAVESYS %s \n IPL %s", 121 kernel_nss_name, kernel_nss_name); 122 123 __cpcmd(defsys_cmd, NULL, 0, &response); 124 125 if (response != 0) { 126 kernel_nss_name[0] = '\0'; 127 return; 128 } 129 130 len = strlen(savesys_cmd); 131 ASCEBC(savesys_cmd, len); 132 response = savesys_ipl_nss(savesys_cmd, len); 133 134 /* On success: response is equal to the command size, 135 * max SAVESYS_CMD_SIZE 136 * On error: response contains the numeric portion of cp error message. 137 * for SAVESYS it will be >= 263 138 */ 139 if (response > SAVESYS_CMD_SIZE) { 140 kernel_nss_name[0] = '\0'; 141 return; 142 } 143 144 /* re-setup boot command line with new ipl vm parms */ 145 ipl_update_parameters(); 146 setup_boot_command_line(); 147 148 ipl_flags = IPL_NSS_VALID; 149 } 150 151 #else /* CONFIG_SHARED_KERNEL */ 152 153 static inline void create_kernel_nss(void) { } 154 155 #endif /* CONFIG_SHARED_KERNEL */ 156 157 /* 158 * Clear bss memory 159 */ 160 static noinline __init void clear_bss_section(void) 161 { 162 memset(__bss_start, 0, __bss_stop - __bss_start); 163 } 164 165 /* 166 * Initialize storage key for kernel pages 167 */ 168 static noinline __init void init_kernel_storage_key(void) 169 { 170 unsigned long end_pfn, init_pfn; 171 172 end_pfn = PFN_UP(__pa(&_end)); 173 174 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 175 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY); 176 } 177 178 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); 179 180 static noinline __init void detect_machine_type(void) 181 { 182 /* No VM information? Looks like LPAR */ 183 if (stsi(&vmms, 3, 2, 2) == -ENOSYS) 184 return; 185 if (!vmms.count) 186 return; 187 188 /* Running under KVM? If not we assume z/VM */ 189 if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) 190 machine_flags |= MACHINE_FLAG_KVM; 191 else 192 machine_flags |= MACHINE_FLAG_VM; 193 } 194 195 static __init void early_pgm_check_handler(void) 196 { 197 unsigned long addr; 198 const struct exception_table_entry *fixup; 199 200 addr = S390_lowcore.program_old_psw.addr; 201 fixup = search_exception_tables(addr & PSW_ADDR_INSN); 202 if (!fixup) 203 disabled_wait(0); 204 S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE; 205 } 206 207 static noinline __init void setup_lowcore_early(void) 208 { 209 psw_t psw; 210 211 psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; 212 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler; 213 S390_lowcore.external_new_psw = psw; 214 psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler; 215 S390_lowcore.program_new_psw = psw; 216 s390_base_pgm_handler_fn = early_pgm_check_handler; 217 } 218 219 static noinline __init void setup_hpage(void) 220 { 221 #ifndef CONFIG_DEBUG_PAGEALLOC 222 unsigned int facilities; 223 224 facilities = stfl(); 225 if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29))) 226 return; 227 machine_flags |= MACHINE_FLAG_HPAGE; 228 __ctl_set_bit(0, 23); 229 #endif 230 } 231 232 static __init void detect_mvpg(void) 233 { 234 #ifndef CONFIG_64BIT 235 int rc; 236 237 asm volatile( 238 " la 0,0\n" 239 " mvpg %2,%2\n" 240 "0: la %0,0\n" 241 "1:\n" 242 EX_TABLE(0b,1b) 243 : "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0"); 244 if (!rc) 245 machine_flags |= MACHINE_FLAG_MVPG; 246 #endif 247 } 248 249 static __init void detect_ieee(void) 250 { 251 #ifndef CONFIG_64BIT 252 int rc, tmp; 253 254 asm volatile( 255 " efpc %1,0\n" 256 "0: la %0,0\n" 257 "1:\n" 258 EX_TABLE(0b,1b) 259 : "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc"); 260 if (!rc) 261 machine_flags |= MACHINE_FLAG_IEEE; 262 #endif 263 } 264 265 static __init void detect_csp(void) 266 { 267 #ifndef CONFIG_64BIT 268 int rc; 269 270 asm volatile( 271 " la 0,0\n" 272 " la 1,0\n" 273 " la 2,4\n" 274 " csp 0,2\n" 275 "0: la %0,0\n" 276 "1:\n" 277 EX_TABLE(0b,1b) 278 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2"); 279 if (!rc) 280 machine_flags |= MACHINE_FLAG_CSP; 281 #endif 282 } 283 284 static __init void detect_diag9c(void) 285 { 286 unsigned int cpu_address; 287 int rc; 288 289 cpu_address = stap(); 290 asm volatile( 291 " diag %2,0,0x9c\n" 292 "0: la %0,0\n" 293 "1:\n" 294 EX_TABLE(0b,1b) 295 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 296 if (!rc) 297 machine_flags |= MACHINE_FLAG_DIAG9C; 298 } 299 300 static __init void detect_diag44(void) 301 { 302 #ifdef CONFIG_64BIT 303 int rc; 304 305 asm volatile( 306 " diag 0,0,0x44\n" 307 "0: la %0,0\n" 308 "1:\n" 309 EX_TABLE(0b,1b) 310 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 311 if (!rc) 312 machine_flags |= MACHINE_FLAG_DIAG44; 313 #endif 314 } 315 316 static __init void detect_machine_facilities(void) 317 { 318 #ifdef CONFIG_64BIT 319 unsigned int facilities; 320 321 facilities = stfl(); 322 if (facilities & (1 << 28)) 323 machine_flags |= MACHINE_FLAG_IDTE; 324 if (facilities & (1 << 23)) 325 machine_flags |= MACHINE_FLAG_PFMF; 326 if (facilities & (1 << 4)) 327 machine_flags |= MACHINE_FLAG_MVCOS; 328 #endif 329 } 330 331 static __init void rescue_initrd(void) 332 { 333 #ifdef CONFIG_BLK_DEV_INITRD 334 /* 335 * Move the initrd right behind the bss section in case it starts 336 * within the bss section. So we don't overwrite it when the bss 337 * section gets cleared. 338 */ 339 if (!INITRD_START || !INITRD_SIZE) 340 return; 341 if (INITRD_START >= (unsigned long) __bss_stop) 342 return; 343 memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE); 344 INITRD_START = (unsigned long) __bss_stop; 345 #endif 346 } 347 348 /* Set up boot command line */ 349 static void __init setup_boot_command_line(void) 350 { 351 char *parm = NULL; 352 353 /* copy arch command line */ 354 strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 355 356 /* append IPL PARM data to the boot command line */ 357 if (MACHINE_IS_VM) { 358 parm = boot_command_line + strlen(boot_command_line); 359 *parm++ = ' '; 360 get_ipl_vmparm(parm); 361 if (parm[0] == '=') 362 memmove(boot_command_line, parm + 1, strlen(parm)); 363 } 364 } 365 366 367 /* 368 * Save ipl parameters, clear bss memory, initialize storage keys 369 * and create a kernel NSS at startup if the SAVESYS= parm is defined 370 */ 371 void __init startup_init(void) 372 { 373 ipl_save_parameters(); 374 rescue_initrd(); 375 clear_bss_section(); 376 init_kernel_storage_key(); 377 lockdep_init(); 378 lockdep_off(); 379 sort_main_extable(); 380 setup_lowcore_early(); 381 detect_machine_type(); 382 ipl_update_parameters(); 383 setup_boot_command_line(); 384 create_kernel_nss(); 385 detect_mvpg(); 386 detect_ieee(); 387 detect_csp(); 388 detect_diag9c(); 389 detect_diag44(); 390 detect_machine_facilities(); 391 setup_hpage(); 392 sclp_facilities_detect(); 393 detect_memory_layout(memory_chunk); 394 lockdep_on(); 395 } 396