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 <asm/boot_data.h> 33 #include "entry.h" 34 35 /* 36 * Initialize storage key for kernel pages 37 */ 38 static noinline __init void init_kernel_storage_key(void) 39 { 40 #if PAGE_DEFAULT_KEY 41 unsigned long end_pfn, init_pfn; 42 43 end_pfn = PFN_UP(__pa(_end)); 44 45 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 46 page_set_storage_key(init_pfn << PAGE_SHIFT, 47 PAGE_DEFAULT_KEY, 0); 48 #endif 49 } 50 51 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 52 53 static noinline __init void detect_machine_type(void) 54 { 55 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; 56 57 /* Check current-configuration-level */ 58 if (stsi(NULL, 0, 0, 0) <= 2) { 59 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 60 return; 61 } 62 /* Get virtual-machine cpu information. */ 63 if (stsi(vmms, 3, 2, 2) || !vmms->count) 64 return; 65 66 /* Running under KVM? If not we assume z/VM */ 67 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) 68 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 69 else 70 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 71 } 72 73 /* Remove leading, trailing and double whitespace. */ 74 static inline void strim_all(char *str) 75 { 76 char *s; 77 78 s = strim(str); 79 if (s != str) 80 memmove(str, s, strlen(s)); 81 while (*str) { 82 if (!isspace(*str++)) 83 continue; 84 if (isspace(*str)) { 85 s = skip_spaces(str); 86 memmove(str, s, strlen(s) + 1); 87 } 88 } 89 } 90 91 static noinline __init void setup_arch_string(void) 92 { 93 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; 94 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; 95 char mstr[80], hvstr[17]; 96 97 if (stsi(mach, 1, 1, 1)) 98 return; 99 EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); 100 EBCASC(mach->type, sizeof(mach->type)); 101 EBCASC(mach->model, sizeof(mach->model)); 102 EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); 103 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", 104 mach->manufacturer, mach->type, 105 mach->model, mach->model_capacity); 106 strim_all(mstr); 107 if (stsi(vm, 3, 2, 2) == 0 && vm->count) { 108 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); 109 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); 110 strim_all(hvstr); 111 } else { 112 sprintf(hvstr, "%s", 113 MACHINE_IS_LPAR ? "LPAR" : 114 MACHINE_IS_VM ? "z/VM" : 115 MACHINE_IS_KVM ? "KVM" : "unknown"); 116 } 117 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); 118 } 119 120 static __init void setup_topology(void) 121 { 122 int max_mnest; 123 124 if (!test_facility(11)) 125 return; 126 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 127 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 128 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 129 break; 130 } 131 topology_max_mnest = max_mnest; 132 } 133 134 static void early_pgm_check_handler(void) 135 { 136 const struct exception_table_entry *fixup; 137 unsigned long cr0, cr0_new; 138 unsigned long addr; 139 140 addr = S390_lowcore.program_old_psw.addr; 141 fixup = search_exception_tables(addr); 142 if (!fixup) 143 disabled_wait(0); 144 /* Disable low address protection before storing into lowcore. */ 145 __ctl_store(cr0, 0, 0); 146 cr0_new = cr0 & ~(1UL << 28); 147 __ctl_load(cr0_new, 0, 0); 148 S390_lowcore.program_old_psw.addr = extable_fixup(fixup); 149 __ctl_load(cr0, 0, 0); 150 } 151 152 static noinline __init void setup_lowcore_early(void) 153 { 154 psw_t psw; 155 156 psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; 157 psw.addr = (unsigned long) s390_base_ext_handler; 158 S390_lowcore.external_new_psw = psw; 159 psw.addr = (unsigned long) s390_base_pgm_handler; 160 S390_lowcore.program_new_psw = psw; 161 s390_base_pgm_handler_fn = early_pgm_check_handler; 162 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT; 163 } 164 165 static noinline __init void setup_facility_list(void) 166 { 167 stfle(S390_lowcore.stfle_fac_list, 168 ARRAY_SIZE(S390_lowcore.stfle_fac_list)); 169 memcpy(S390_lowcore.alt_stfle_fac_list, 170 S390_lowcore.stfle_fac_list, 171 sizeof(S390_lowcore.alt_stfle_fac_list)); 172 if (!IS_ENABLED(CONFIG_KERNEL_NOBP)) 173 __clear_facility(82, S390_lowcore.alt_stfle_fac_list); 174 } 175 176 static __init void detect_diag9c(void) 177 { 178 unsigned int cpu_address; 179 int rc; 180 181 cpu_address = stap(); 182 diag_stat_inc(DIAG_STAT_X09C); 183 asm volatile( 184 " diag %2,0,0x9c\n" 185 "0: la %0,0\n" 186 "1:\n" 187 EX_TABLE(0b,1b) 188 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 189 if (!rc) 190 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 191 } 192 193 static __init void detect_diag44(void) 194 { 195 int rc; 196 197 diag_stat_inc(DIAG_STAT_X044); 198 asm volatile( 199 " diag 0,0,0x44\n" 200 "0: la %0,0\n" 201 "1:\n" 202 EX_TABLE(0b,1b) 203 : "=d" (rc) : "0" (-EOPNOTSUPP) : "cc"); 204 if (!rc) 205 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44; 206 } 207 208 static __init void detect_machine_facilities(void) 209 { 210 if (test_facility(8)) { 211 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; 212 __ctl_set_bit(0, 23); 213 } 214 if (test_facility(78)) 215 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; 216 if (test_facility(3)) 217 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 218 if (test_facility(50) && test_facility(73)) { 219 S390_lowcore.machine_flags |= MACHINE_FLAG_TE; 220 __ctl_set_bit(0, 55); 221 } 222 if (test_facility(51)) 223 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC; 224 if (test_facility(129)) { 225 S390_lowcore.machine_flags |= MACHINE_FLAG_VX; 226 __ctl_set_bit(0, 17); 227 } 228 if (test_facility(130)) { 229 S390_lowcore.machine_flags |= MACHINE_FLAG_NX; 230 __ctl_set_bit(0, 20); 231 } 232 if (test_facility(133)) 233 S390_lowcore.machine_flags |= MACHINE_FLAG_GS; 234 if (test_facility(139) && (tod_clock_base[1] & 0x80)) { 235 /* Enabled signed clock comparator comparisons */ 236 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC; 237 clock_comparator_max = -1ULL >> 1; 238 __ctl_set_bit(0, 53); 239 } 240 } 241 242 static inline void save_vector_registers(void) 243 { 244 #ifdef CONFIG_CRASH_DUMP 245 if (test_facility(129)) 246 save_vx_regs(boot_cpu_vector_save_area); 247 #endif 248 } 249 250 static int __init disable_vector_extension(char *str) 251 { 252 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX; 253 __ctl_clear_bit(0, 17); 254 return 0; 255 } 256 early_param("novx", disable_vector_extension); 257 258 static int __init noexec_setup(char *str) 259 { 260 bool enabled; 261 int rc; 262 263 rc = kstrtobool(str, &enabled); 264 if (!rc && !enabled) { 265 /* Disable no-execute support */ 266 S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX; 267 __ctl_clear_bit(0, 20); 268 } 269 return rc; 270 } 271 early_param("noexec", noexec_setup); 272 273 static int __init cad_setup(char *str) 274 { 275 bool enabled; 276 int rc; 277 278 rc = kstrtobool(str, &enabled); 279 if (!rc && enabled && test_facility(128)) 280 /* Enable problem state CAD. */ 281 __ctl_set_bit(2, 3); 282 return rc; 283 } 284 early_param("cad", cad_setup); 285 286 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 287 static void __init setup_boot_command_line(void) 288 { 289 /* copy arch command line */ 290 strlcpy(boot_command_line, early_command_line, ARCH_COMMAND_LINE_SIZE); 291 } 292 293 static void __init check_image_bootable(void) 294 { 295 if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING))) 296 return; 297 298 sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n"); 299 sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n"); 300 sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n"); 301 disabled_wait(0xbadb007); 302 } 303 304 void __init startup_init(void) 305 { 306 check_image_bootable(); 307 time_early_init(); 308 init_kernel_storage_key(); 309 lockdep_off(); 310 setup_lowcore_early(); 311 setup_facility_list(); 312 detect_machine_type(); 313 setup_arch_string(); 314 ipl_store_parameters(); 315 setup_boot_command_line(); 316 detect_diag9c(); 317 detect_diag44(); 318 detect_machine_facilities(); 319 save_vector_registers(); 320 setup_topology(); 321 sclp_early_detect(); 322 lockdep_on(); 323 } 324