1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 2007, 2009 4 * Author(s): Hongjie Yang <hongjie@us.ibm.com>, 5 * Heiko Carstens <heiko.carstens@de.ibm.com> 6 */ 7 8 #define KMSG_COMPONENT "setup" 9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 10 11 #include <linux/compiler.h> 12 #include <linux/init.h> 13 #include <linux/errno.h> 14 #include <linux/string.h> 15 #include <linux/ctype.h> 16 #include <linux/lockdep.h> 17 #include <linux/extable.h> 18 #include <linux/pfn.h> 19 #include <linux/uaccess.h> 20 #include <linux/kernel.h> 21 #include <asm/diag.h> 22 #include <asm/ebcdic.h> 23 #include <asm/ipl.h> 24 #include <asm/lowcore.h> 25 #include <asm/processor.h> 26 #include <asm/sections.h> 27 #include <asm/setup.h> 28 #include <asm/sysinfo.h> 29 #include <asm/cpcmd.h> 30 #include <asm/sclp.h> 31 #include <asm/facility.h> 32 #include "entry.h" 33 34 static void __init setup_boot_command_line(void); 35 36 /* 37 * Initialize storage key for kernel pages 38 */ 39 static noinline __init void init_kernel_storage_key(void) 40 { 41 #if PAGE_DEFAULT_KEY 42 unsigned long end_pfn, init_pfn; 43 44 end_pfn = PFN_UP(__pa(_end)); 45 46 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 47 page_set_storage_key(init_pfn << PAGE_SHIFT, 48 PAGE_DEFAULT_KEY, 0); 49 #endif 50 } 51 52 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 53 54 static noinline __init void detect_machine_type(void) 55 { 56 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; 57 58 /* Check current-configuration-level */ 59 if (stsi(NULL, 0, 0, 0) <= 2) { 60 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 61 return; 62 } 63 /* Get virtual-machine cpu information. */ 64 if (stsi(vmms, 3, 2, 2) || !vmms->count) 65 return; 66 67 /* Running under KVM? If not we assume z/VM */ 68 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) 69 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 70 else 71 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 72 } 73 74 /* Remove leading, trailing and double whitespace. */ 75 static inline void strim_all(char *str) 76 { 77 char *s; 78 79 s = strim(str); 80 if (s != str) 81 memmove(str, s, strlen(s)); 82 while (*str) { 83 if (!isspace(*str++)) 84 continue; 85 if (isspace(*str)) { 86 s = skip_spaces(str); 87 memmove(str, s, strlen(s) + 1); 88 } 89 } 90 } 91 92 static noinline __init void setup_arch_string(void) 93 { 94 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; 95 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; 96 char mstr[80], hvstr[17]; 97 98 if (stsi(mach, 1, 1, 1)) 99 return; 100 EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); 101 EBCASC(mach->type, sizeof(mach->type)); 102 EBCASC(mach->model, sizeof(mach->model)); 103 EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); 104 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", 105 mach->manufacturer, mach->type, 106 mach->model, mach->model_capacity); 107 strim_all(mstr); 108 if (stsi(vm, 3, 2, 2) == 0 && vm->count) { 109 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); 110 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); 111 strim_all(hvstr); 112 } else { 113 sprintf(hvstr, "%s", 114 MACHINE_IS_LPAR ? "LPAR" : 115 MACHINE_IS_VM ? "z/VM" : 116 MACHINE_IS_KVM ? "KVM" : "unknown"); 117 } 118 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); 119 } 120 121 static __init void setup_topology(void) 122 { 123 int max_mnest; 124 125 if (!test_facility(11)) 126 return; 127 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 128 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 129 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 130 break; 131 } 132 topology_max_mnest = max_mnest; 133 } 134 135 static void early_pgm_check_handler(void) 136 { 137 const struct exception_table_entry *fixup; 138 unsigned long cr0, cr0_new; 139 unsigned long addr; 140 141 addr = S390_lowcore.program_old_psw.addr; 142 fixup = search_exception_tables(addr); 143 if (!fixup) 144 disabled_wait(0); 145 /* Disable low address protection before storing into lowcore. */ 146 __ctl_store(cr0, 0, 0); 147 cr0_new = cr0 & ~(1UL << 28); 148 __ctl_load(cr0_new, 0, 0); 149 S390_lowcore.program_old_psw.addr = extable_fixup(fixup); 150 __ctl_load(cr0, 0, 0); 151 } 152 153 static noinline __init void setup_lowcore_early(void) 154 { 155 psw_t psw; 156 157 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; 158 psw.addr = (unsigned long) s390_base_ext_handler; 159 S390_lowcore.external_new_psw = psw; 160 psw.addr = (unsigned long) s390_base_pgm_handler; 161 S390_lowcore.program_new_psw = psw; 162 s390_base_pgm_handler_fn = early_pgm_check_handler; 163 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT; 164 } 165 166 static noinline __init void setup_facility_list(void) 167 { 168 stfle(S390_lowcore.stfle_fac_list, 169 ARRAY_SIZE(S390_lowcore.stfle_fac_list)); 170 memcpy(S390_lowcore.alt_stfle_fac_list, 171 S390_lowcore.stfle_fac_list, 172 sizeof(S390_lowcore.alt_stfle_fac_list)); 173 if (!IS_ENABLED(CONFIG_KERNEL_NOBP)) 174 __clear_facility(82, S390_lowcore.alt_stfle_fac_list); 175 } 176 177 static __init void detect_diag9c(void) 178 { 179 unsigned int cpu_address; 180 int rc; 181 182 cpu_address = stap(); 183 diag_stat_inc(DIAG_STAT_X09C); 184 asm volatile( 185 " diag %2,0,0x9c\n" 186 "0: la %0,0\n" 187 "1:\n" 188 EX_TABLE(0b,1b) 189 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 190 if (!rc) 191 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 192 } 193 194 static __init void detect_diag44(void) 195 { 196 int rc; 197 198 diag_stat_inc(DIAG_STAT_X044); 199 asm volatile( 200 " diag 0,0,0x44\n" 201 "0: la %0,0\n" 202 "1:\n" 203 EX_TABLE(0b,1b) 204 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 205 if (!rc) 206 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 207 } 208 209 static __init void detect_machine_facilities(void) 210 { 211 if (test_facility(8)) { 212 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; 213 __ctl_set_bit(0, 23); 214 } 215 if (test_facility(78)) 216 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; 217 if (test_facility(3)) 218 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 219 if (test_facility(50) && test_facility(73)) { 220 S390_lowcore.machine_flags |= MACHINE_FLAG_TE; 221 __ctl_set_bit(0, 55); 222 } 223 if (test_facility(51)) 224 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC; 225 if (test_facility(129)) { 226 S390_lowcore.machine_flags |= MACHINE_FLAG_VX; 227 __ctl_set_bit(0, 17); 228 } 229 if (test_facility(130)) { 230 S390_lowcore.machine_flags |= MACHINE_FLAG_NX; 231 __ctl_set_bit(0, 20); 232 } 233 if (test_facility(133)) 234 S390_lowcore.machine_flags |= MACHINE_FLAG_GS; 235 if (test_facility(139) && (tod_clock_base[1] & 0x80)) { 236 /* Enabled signed clock comparator comparisons */ 237 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC; 238 clock_comparator_max = -1ULL >> 1; 239 __ctl_set_bit(0, 53); 240 } 241 } 242 243 static inline void save_vector_registers(void) 244 { 245 #ifdef CONFIG_CRASH_DUMP 246 if (test_facility(129)) 247 save_vx_regs(boot_cpu_vector_save_area); 248 #endif 249 } 250 251 static int __init disable_vector_extension(char *str) 252 { 253 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX; 254 __ctl_clear_bit(0, 17); 255 return 0; 256 } 257 early_param("novx", disable_vector_extension); 258 259 static int __init noexec_setup(char *str) 260 { 261 bool enabled; 262 int rc; 263 264 rc = kstrtobool(str, &enabled); 265 if (!rc && !enabled) { 266 /* Disable no-execute support */ 267 S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX; 268 __ctl_clear_bit(0, 20); 269 } 270 return rc; 271 } 272 early_param("noexec", noexec_setup); 273 274 static int __init cad_setup(char *str) 275 { 276 bool enabled; 277 int rc; 278 279 rc = kstrtobool(str, &enabled); 280 if (!rc && enabled && test_facility(128)) 281 /* Enable problem state CAD. */ 282 __ctl_set_bit(2, 3); 283 return rc; 284 } 285 early_param("cad", cad_setup); 286 287 /* Set up boot command line */ 288 static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t)) 289 { 290 char *parm, *delim; 291 size_t rc, len; 292 293 len = strlen(boot_command_line); 294 295 delim = boot_command_line + len; /* '\0' character position */ 296 parm = boot_command_line + len + 1; /* append right after '\0' */ 297 298 rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1); 299 if (rc) { 300 if (*parm == '=') 301 memmove(boot_command_line, parm + 1, rc); 302 else 303 *delim = ' '; /* replace '\0' with space */ 304 } 305 } 306 307 static inline int has_ebcdic_char(const char *str) 308 { 309 int i; 310 311 for (i = 0; str[i]; i++) 312 if (str[i] & 0x80) 313 return 1; 314 return 0; 315 } 316 317 static void __init setup_boot_command_line(void) 318 { 319 COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0; 320 /* convert arch command line to ascii if necessary */ 321 if (has_ebcdic_char(COMMAND_LINE)) 322 EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE); 323 /* copy arch command line */ 324 strlcpy(boot_command_line, strstrip(COMMAND_LINE), 325 ARCH_COMMAND_LINE_SIZE); 326 327 /* append IPL PARM data to the boot command line */ 328 if (MACHINE_IS_VM) 329 append_to_cmdline(append_ipl_vmparm); 330 331 append_to_cmdline(append_ipl_scpdata); 332 } 333 334 void __init startup_init(void) 335 { 336 time_early_init(); 337 init_kernel_storage_key(); 338 lockdep_off(); 339 setup_lowcore_early(); 340 setup_facility_list(); 341 detect_machine_type(); 342 setup_arch_string(); 343 ipl_store_parameters(); 344 setup_boot_command_line(); 345 detect_diag9c(); 346 detect_diag44(); 347 detect_machine_facilities(); 348 save_vector_registers(); 349 setup_topology(); 350 sclp_early_detect(); 351 lockdep_on(); 352 } 353