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/access-regs.h> 23 #include <asm/diag.h> 24 #include <asm/ebcdic.h> 25 #include <asm/fpu.h> 26 #include <asm/ipl.h> 27 #include <asm/lowcore.h> 28 #include <asm/processor.h> 29 #include <asm/sections.h> 30 #include <asm/setup.h> 31 #include <asm/sysinfo.h> 32 #include <asm/cpcmd.h> 33 #include <asm/sclp.h> 34 #include <asm/facility.h> 35 #include <asm/boot_data.h> 36 #include "entry.h" 37 38 #define decompressor_handled_param(param) \ 39 static int __init ignore_decompressor_param_##param(char *s) \ 40 { \ 41 return 0; \ 42 } \ 43 early_param(#param, ignore_decompressor_param_##param) 44 45 decompressor_handled_param(mem); 46 decompressor_handled_param(vmalloc); 47 decompressor_handled_param(dfltcc); 48 decompressor_handled_param(facilities); 49 decompressor_handled_param(nokaslr); 50 decompressor_handled_param(cmma); 51 #if IS_ENABLED(CONFIG_KVM) 52 decompressor_handled_param(prot_virt); 53 #endif 54 55 static void __init kasan_early_init(void) 56 { 57 #ifdef CONFIG_KASAN 58 init_task.kasan_depth = 0; 59 sclp_early_printk("KernelAddressSanitizer initialized\n"); 60 #endif 61 } 62 63 static void __init reset_tod_clock(void) 64 { 65 union tod_clock clk; 66 67 if (store_tod_clock_ext_cc(&clk) == 0) 68 return; 69 /* TOD clock not running. Set the clock to Unix Epoch. */ 70 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk)) 71 disabled_wait(); 72 73 memset(&tod_clock_base, 0, sizeof(tod_clock_base)); 74 tod_clock_base.tod = TOD_UNIX_EPOCH; 75 S390_lowcore.last_update_clock = TOD_UNIX_EPOCH; 76 } 77 78 /* 79 * Initialize storage key for kernel pages 80 */ 81 static noinline __init void init_kernel_storage_key(void) 82 { 83 #if PAGE_DEFAULT_KEY 84 unsigned long end_pfn, init_pfn; 85 86 end_pfn = PFN_UP(__pa(_end)); 87 88 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 89 page_set_storage_key(init_pfn << PAGE_SHIFT, 90 PAGE_DEFAULT_KEY, 0); 91 #endif 92 } 93 94 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 95 96 static noinline __init void detect_machine_type(void) 97 { 98 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; 99 100 /* Check current-configuration-level */ 101 if (stsi(NULL, 0, 0, 0) <= 2) { 102 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 103 return; 104 } 105 /* Get virtual-machine cpu information. */ 106 if (stsi(vmms, 3, 2, 2) || !vmms->count) 107 return; 108 109 /* Detect known hypervisors */ 110 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) 111 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 112 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4)) 113 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 114 } 115 116 /* Remove leading, trailing and double whitespace. */ 117 static inline void strim_all(char *str) 118 { 119 char *s; 120 121 s = strim(str); 122 if (s != str) 123 memmove(str, s, strlen(s)); 124 while (*str) { 125 if (!isspace(*str++)) 126 continue; 127 if (isspace(*str)) { 128 s = skip_spaces(str); 129 memmove(str, s, strlen(s) + 1); 130 } 131 } 132 } 133 134 static noinline __init void setup_arch_string(void) 135 { 136 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; 137 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; 138 char mstr[80], hvstr[17]; 139 140 if (stsi(mach, 1, 1, 1)) 141 return; 142 EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); 143 EBCASC(mach->type, sizeof(mach->type)); 144 EBCASC(mach->model, sizeof(mach->model)); 145 EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); 146 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", 147 mach->manufacturer, mach->type, 148 mach->model, mach->model_capacity); 149 strim_all(mstr); 150 if (stsi(vm, 3, 2, 2) == 0 && vm->count) { 151 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); 152 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); 153 strim_all(hvstr); 154 } else { 155 sprintf(hvstr, "%s", 156 MACHINE_IS_LPAR ? "LPAR" : 157 MACHINE_IS_VM ? "z/VM" : 158 MACHINE_IS_KVM ? "KVM" : "unknown"); 159 } 160 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); 161 } 162 163 static __init void setup_topology(void) 164 { 165 int max_mnest; 166 167 if (!test_facility(11)) 168 return; 169 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 170 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 171 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 172 break; 173 } 174 topology_max_mnest = max_mnest; 175 } 176 177 void __do_early_pgm_check(struct pt_regs *regs) 178 { 179 if (!fixup_exception(regs)) 180 disabled_wait(); 181 } 182 183 static noinline __init void setup_lowcore_early(void) 184 { 185 psw_t psw; 186 187 psw.addr = (unsigned long)early_pgm_check_handler; 188 psw.mask = PSW_KERNEL_BITS; 189 S390_lowcore.program_new_psw = psw; 190 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT; 191 } 192 193 static noinline __init void setup_facility_list(void) 194 { 195 memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list)); 196 if (!IS_ENABLED(CONFIG_KERNEL_NOBP)) 197 __clear_facility(82, alt_stfle_fac_list); 198 } 199 200 static __init void detect_diag9c(void) 201 { 202 unsigned int cpu_address; 203 int rc; 204 205 cpu_address = stap(); 206 diag_stat_inc(DIAG_STAT_X09C); 207 asm volatile( 208 " diag %2,0,0x9c\n" 209 "0: la %0,0\n" 210 "1:\n" 211 EX_TABLE(0b,1b) 212 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 213 if (!rc) 214 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 215 } 216 217 static __init void detect_machine_facilities(void) 218 { 219 if (test_facility(8)) { 220 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; 221 system_ctl_set_bit(0, CR0_EDAT_BIT); 222 } 223 if (test_facility(78)) 224 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; 225 if (test_facility(3)) 226 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 227 if (test_facility(50) && test_facility(73)) { 228 S390_lowcore.machine_flags |= MACHINE_FLAG_TE; 229 system_ctl_set_bit(0, CR0_TRANSACTIONAL_EXECUTION_BIT); 230 } 231 if (test_facility(51)) 232 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC; 233 if (test_facility(129)) 234 system_ctl_set_bit(0, CR0_VECTOR_BIT); 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 system_ctl_set_bit(0, CR0_CLOCK_COMPARATOR_SIGN_BIT); 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_low_address_protection(void) 262 { 263 system_ctl_set_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT); 264 } 265 266 static inline void setup_access_registers(void) 267 { 268 unsigned int acrs[NUM_ACRS] = { 0 }; 269 270 restore_access_regs(acrs); 271 } 272 273 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 274 static void __init setup_boot_command_line(void) 275 { 276 /* copy arch command line */ 277 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE); 278 } 279 280 static void __init sort_amode31_extable(void) 281 { 282 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table); 283 } 284 285 void __init startup_init(void) 286 { 287 kasan_early_init(); 288 reset_tod_clock(); 289 time_early_init(); 290 init_kernel_storage_key(); 291 lockdep_off(); 292 sort_amode31_extable(); 293 setup_lowcore_early(); 294 setup_facility_list(); 295 detect_machine_type(); 296 setup_arch_string(); 297 setup_boot_command_line(); 298 detect_diag9c(); 299 detect_machine_facilities(); 300 save_vector_registers(); 301 setup_topology(); 302 sclp_early_detect(); 303 setup_low_address_protection(); 304 setup_access_registers(); 305 lockdep_on(); 306 } 307