1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 2007, 2009 4 * Author(s): Hongjie Yang <hongjie@us.ibm.com>, 5 */ 6 7 #define KMSG_COMPONENT "setup" 8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 9 10 #include <linux/compiler.h> 11 #include <linux/init.h> 12 #include <linux/errno.h> 13 #include <linux/string.h> 14 #include <linux/ctype.h> 15 #include <linux/lockdep.h> 16 #include <linux/extable.h> 17 #include <linux/pfn.h> 18 #include <linux/uaccess.h> 19 #include <linux/kernel.h> 20 #include <asm/asm-extable.h> 21 #include <linux/memblock.h> 22 #include <asm/diag.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 <asm/facility.h> 33 #include <asm/boot_data.h> 34 #include <asm/switch_to.h> 35 #include "entry.h" 36 37 #define decompressor_handled_param(param) \ 38 static int __init ignore_decompressor_param_##param(char *s) \ 39 { \ 40 return 0; \ 41 } \ 42 early_param(#param, ignore_decompressor_param_##param) 43 44 decompressor_handled_param(mem); 45 decompressor_handled_param(vmalloc); 46 decompressor_handled_param(dfltcc); 47 decompressor_handled_param(facilities); 48 decompressor_handled_param(nokaslr); 49 #if IS_ENABLED(CONFIG_KVM) 50 decompressor_handled_param(prot_virt); 51 #endif 52 53 static void __init kasan_early_init(void) 54 { 55 #ifdef CONFIG_KASAN 56 init_task.kasan_depth = 0; 57 sclp_early_printk("KernelAddressSanitizer initialized\n"); 58 #endif 59 } 60 61 static void __init reset_tod_clock(void) 62 { 63 union tod_clock clk; 64 65 if (store_tod_clock_ext_cc(&clk) == 0) 66 return; 67 /* TOD clock not running. Set the clock to Unix Epoch. */ 68 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk)) 69 disabled_wait(); 70 71 memset(&tod_clock_base, 0, sizeof(tod_clock_base)); 72 tod_clock_base.tod = TOD_UNIX_EPOCH; 73 S390_lowcore.last_update_clock = TOD_UNIX_EPOCH; 74 } 75 76 /* 77 * Initialize storage key for kernel pages 78 */ 79 static noinline __init void init_kernel_storage_key(void) 80 { 81 #if PAGE_DEFAULT_KEY 82 unsigned long end_pfn, init_pfn; 83 84 end_pfn = PFN_UP(__pa(_end)); 85 86 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 87 page_set_storage_key(init_pfn << PAGE_SHIFT, 88 PAGE_DEFAULT_KEY, 0); 89 #endif 90 } 91 92 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 93 94 static noinline __init void detect_machine_type(void) 95 { 96 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; 97 98 /* Check current-configuration-level */ 99 if (stsi(NULL, 0, 0, 0) <= 2) { 100 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 101 return; 102 } 103 /* Get virtual-machine cpu information. */ 104 if (stsi(vmms, 3, 2, 2) || !vmms->count) 105 return; 106 107 /* Detect known hypervisors */ 108 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) 109 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 110 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4)) 111 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 112 } 113 114 /* Remove leading, trailing and double whitespace. */ 115 static inline void strim_all(char *str) 116 { 117 char *s; 118 119 s = strim(str); 120 if (s != str) 121 memmove(str, s, strlen(s)); 122 while (*str) { 123 if (!isspace(*str++)) 124 continue; 125 if (isspace(*str)) { 126 s = skip_spaces(str); 127 memmove(str, s, strlen(s) + 1); 128 } 129 } 130 } 131 132 static noinline __init void setup_arch_string(void) 133 { 134 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; 135 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; 136 char mstr[80], hvstr[17]; 137 138 if (stsi(mach, 1, 1, 1)) 139 return; 140 EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); 141 EBCASC(mach->type, sizeof(mach->type)); 142 EBCASC(mach->model, sizeof(mach->model)); 143 EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); 144 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", 145 mach->manufacturer, mach->type, 146 mach->model, mach->model_capacity); 147 strim_all(mstr); 148 if (stsi(vm, 3, 2, 2) == 0 && vm->count) { 149 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); 150 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); 151 strim_all(hvstr); 152 } else { 153 sprintf(hvstr, "%s", 154 MACHINE_IS_LPAR ? "LPAR" : 155 MACHINE_IS_VM ? "z/VM" : 156 MACHINE_IS_KVM ? "KVM" : "unknown"); 157 } 158 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); 159 } 160 161 static __init void setup_topology(void) 162 { 163 int max_mnest; 164 165 if (!test_facility(11)) 166 return; 167 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 168 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 169 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 170 break; 171 } 172 topology_max_mnest = max_mnest; 173 } 174 175 void __do_early_pgm_check(struct pt_regs *regs) 176 { 177 if (!fixup_exception(regs)) 178 disabled_wait(); 179 } 180 181 static noinline __init void setup_lowcore_early(void) 182 { 183 psw_t psw; 184 185 psw.addr = (unsigned long)early_pgm_check_handler; 186 psw.mask = PSW_KERNEL_BITS; 187 S390_lowcore.program_new_psw = psw; 188 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT; 189 } 190 191 static noinline __init void setup_facility_list(void) 192 { 193 memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list)); 194 if (!IS_ENABLED(CONFIG_KERNEL_NOBP)) 195 __clear_facility(82, alt_stfle_fac_list); 196 } 197 198 static __init void detect_diag9c(void) 199 { 200 unsigned int cpu_address; 201 int rc; 202 203 cpu_address = stap(); 204 diag_stat_inc(DIAG_STAT_X09C); 205 asm volatile( 206 " diag %2,0,0x9c\n" 207 "0: la %0,0\n" 208 "1:\n" 209 EX_TABLE(0b,1b) 210 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 211 if (!rc) 212 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 213 } 214 215 static __init void detect_machine_facilities(void) 216 { 217 if (test_facility(8)) { 218 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; 219 __ctl_set_bit(0, 23); 220 } 221 if (test_facility(78)) 222 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; 223 if (test_facility(3)) 224 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 225 if (test_facility(50) && test_facility(73)) { 226 S390_lowcore.machine_flags |= MACHINE_FLAG_TE; 227 __ctl_set_bit(0, 55); 228 } 229 if (test_facility(51)) 230 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC; 231 if (test_facility(129)) { 232 S390_lowcore.machine_flags |= MACHINE_FLAG_VX; 233 __ctl_set_bit(0, 17); 234 } 235 if (test_facility(130)) 236 S390_lowcore.machine_flags |= MACHINE_FLAG_NX; 237 if (test_facility(133)) 238 S390_lowcore.machine_flags |= MACHINE_FLAG_GS; 239 if (test_facility(139) && (tod_clock_base.tod >> 63)) { 240 /* Enabled signed clock comparator comparisons */ 241 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC; 242 clock_comparator_max = -1ULL >> 1; 243 __ctl_set_bit(0, 53); 244 } 245 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) { 246 S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO; 247 /* the control bit is set during PCI initialization */ 248 } 249 if (test_facility(194)) 250 S390_lowcore.machine_flags |= MACHINE_FLAG_RDP; 251 } 252 253 static inline void save_vector_registers(void) 254 { 255 #ifdef CONFIG_CRASH_DUMP 256 if (test_facility(129)) 257 save_vx_regs(boot_cpu_vector_save_area); 258 #endif 259 } 260 261 static inline void setup_control_registers(void) 262 { 263 unsigned long reg; 264 265 __ctl_store(reg, 0, 0); 266 reg |= CR0_LOW_ADDRESS_PROTECTION; 267 reg |= CR0_EMERGENCY_SIGNAL_SUBMASK; 268 reg |= CR0_EXTERNAL_CALL_SUBMASK; 269 __ctl_load(reg, 0, 0); 270 } 271 272 static inline void setup_access_registers(void) 273 { 274 unsigned int acrs[NUM_ACRS] = { 0 }; 275 276 restore_access_regs(acrs); 277 } 278 279 static int __init disable_vector_extension(char *str) 280 { 281 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX; 282 __ctl_clear_bit(0, 17); 283 return 0; 284 } 285 early_param("novx", disable_vector_extension); 286 287 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 288 static void __init setup_boot_command_line(void) 289 { 290 /* copy arch command line */ 291 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE); 292 } 293 294 static void __init sort_amode31_extable(void) 295 { 296 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table); 297 } 298 299 void __init startup_init(void) 300 { 301 kasan_early_init(); 302 reset_tod_clock(); 303 time_early_init(); 304 init_kernel_storage_key(); 305 lockdep_off(); 306 sort_amode31_extable(); 307 setup_lowcore_early(); 308 setup_facility_list(); 309 detect_machine_type(); 310 setup_arch_string(); 311 setup_boot_command_line(); 312 detect_diag9c(); 313 detect_machine_facilities(); 314 save_vector_registers(); 315 setup_topology(); 316 sclp_early_detect(); 317 setup_control_registers(); 318 setup_access_registers(); 319 lockdep_on(); 320 } 321