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 decompressor_handled_param(cmma); 50 #if IS_ENABLED(CONFIG_KVM) 51 decompressor_handled_param(prot_virt); 52 #endif 53 54 static void __init kasan_early_init(void) 55 { 56 #ifdef CONFIG_KASAN 57 init_task.kasan_depth = 0; 58 sclp_early_printk("KernelAddressSanitizer initialized\n"); 59 #endif 60 } 61 62 static void __init reset_tod_clock(void) 63 { 64 union tod_clock clk; 65 66 if (store_tod_clock_ext_cc(&clk) == 0) 67 return; 68 /* TOD clock not running. Set the clock to Unix Epoch. */ 69 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk)) 70 disabled_wait(); 71 72 memset(&tod_clock_base, 0, sizeof(tod_clock_base)); 73 tod_clock_base.tod = TOD_UNIX_EPOCH; 74 S390_lowcore.last_update_clock = TOD_UNIX_EPOCH; 75 } 76 77 /* 78 * Initialize storage key for kernel pages 79 */ 80 static noinline __init void init_kernel_storage_key(void) 81 { 82 #if PAGE_DEFAULT_KEY 83 unsigned long end_pfn, init_pfn; 84 85 end_pfn = PFN_UP(__pa(_end)); 86 87 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 88 page_set_storage_key(init_pfn << PAGE_SHIFT, 89 PAGE_DEFAULT_KEY, 0); 90 #endif 91 } 92 93 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 94 95 static noinline __init void detect_machine_type(void) 96 { 97 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; 98 99 /* Check current-configuration-level */ 100 if (stsi(NULL, 0, 0, 0) <= 2) { 101 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 102 return; 103 } 104 /* Get virtual-machine cpu information. */ 105 if (stsi(vmms, 3, 2, 2) || !vmms->count) 106 return; 107 108 /* Detect known hypervisors */ 109 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) 110 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 111 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4)) 112 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 113 } 114 115 /* Remove leading, trailing and double whitespace. */ 116 static inline void strim_all(char *str) 117 { 118 char *s; 119 120 s = strim(str); 121 if (s != str) 122 memmove(str, s, strlen(s)); 123 while (*str) { 124 if (!isspace(*str++)) 125 continue; 126 if (isspace(*str)) { 127 s = skip_spaces(str); 128 memmove(str, s, strlen(s) + 1); 129 } 130 } 131 } 132 133 static noinline __init void setup_arch_string(void) 134 { 135 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; 136 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; 137 char mstr[80], hvstr[17]; 138 139 if (stsi(mach, 1, 1, 1)) 140 return; 141 EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); 142 EBCASC(mach->type, sizeof(mach->type)); 143 EBCASC(mach->model, sizeof(mach->model)); 144 EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); 145 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", 146 mach->manufacturer, mach->type, 147 mach->model, mach->model_capacity); 148 strim_all(mstr); 149 if (stsi(vm, 3, 2, 2) == 0 && vm->count) { 150 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); 151 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); 152 strim_all(hvstr); 153 } else { 154 sprintf(hvstr, "%s", 155 MACHINE_IS_LPAR ? "LPAR" : 156 MACHINE_IS_VM ? "z/VM" : 157 MACHINE_IS_KVM ? "KVM" : "unknown"); 158 } 159 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); 160 } 161 162 static __init void setup_topology(void) 163 { 164 int max_mnest; 165 166 if (!test_facility(11)) 167 return; 168 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 169 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 170 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 171 break; 172 } 173 topology_max_mnest = max_mnest; 174 } 175 176 void __do_early_pgm_check(struct pt_regs *regs) 177 { 178 if (!fixup_exception(regs)) 179 disabled_wait(); 180 } 181 182 static noinline __init void setup_lowcore_early(void) 183 { 184 psw_t psw; 185 186 psw.addr = (unsigned long)early_pgm_check_handler; 187 psw.mask = PSW_KERNEL_BITS; 188 S390_lowcore.program_new_psw = psw; 189 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT; 190 } 191 192 static noinline __init void setup_facility_list(void) 193 { 194 memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list)); 195 if (!IS_ENABLED(CONFIG_KERNEL_NOBP)) 196 __clear_facility(82, alt_stfle_fac_list); 197 } 198 199 static __init void detect_diag9c(void) 200 { 201 unsigned int cpu_address; 202 int rc; 203 204 cpu_address = stap(); 205 diag_stat_inc(DIAG_STAT_X09C); 206 asm volatile( 207 " diag %2,0,0x9c\n" 208 "0: la %0,0\n" 209 "1:\n" 210 EX_TABLE(0b,1b) 211 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 212 if (!rc) 213 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 214 } 215 216 static __init void detect_machine_facilities(void) 217 { 218 if (test_facility(8)) { 219 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; 220 system_ctl_set_bit(0, CR0_EDAT_BIT); 221 } 222 if (test_facility(78)) 223 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; 224 if (test_facility(3)) 225 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 226 if (test_facility(50) && test_facility(73)) { 227 S390_lowcore.machine_flags |= MACHINE_FLAG_TE; 228 system_ctl_set_bit(0, CR0_TRANSACTIONAL_EXECUTION_BIT); 229 } 230 if (test_facility(51)) 231 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC; 232 if (test_facility(129)) 233 system_ctl_set_bit(0, CR0_VECTOR_BIT); 234 if (test_facility(130)) 235 S390_lowcore.machine_flags |= MACHINE_FLAG_NX; 236 if (test_facility(133)) 237 S390_lowcore.machine_flags |= MACHINE_FLAG_GS; 238 if (test_facility(139) && (tod_clock_base.tod >> 63)) { 239 /* Enabled signed clock comparator comparisons */ 240 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC; 241 clock_comparator_max = -1ULL >> 1; 242 system_ctl_set_bit(0, CR0_CLOCK_COMPARATOR_SIGN_BIT); 243 } 244 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) { 245 S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO; 246 /* the control bit is set during PCI initialization */ 247 } 248 if (test_facility(194)) 249 S390_lowcore.machine_flags |= MACHINE_FLAG_RDP; 250 } 251 252 static inline void save_vector_registers(void) 253 { 254 #ifdef CONFIG_CRASH_DUMP 255 if (test_facility(129)) 256 save_vx_regs(boot_cpu_vector_save_area); 257 #endif 258 } 259 260 static inline void setup_low_address_protection(void) 261 { 262 system_ctl_set_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT); 263 } 264 265 static inline void setup_access_registers(void) 266 { 267 unsigned int acrs[NUM_ACRS] = { 0 }; 268 269 restore_access_regs(acrs); 270 } 271 272 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 273 static void __init setup_boot_command_line(void) 274 { 275 /* copy arch command line */ 276 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE); 277 } 278 279 static void __init sort_amode31_extable(void) 280 { 281 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table); 282 } 283 284 void __init startup_init(void) 285 { 286 kasan_early_init(); 287 reset_tod_clock(); 288 time_early_init(); 289 init_kernel_storage_key(); 290 lockdep_off(); 291 sort_amode31_extable(); 292 setup_lowcore_early(); 293 setup_facility_list(); 294 detect_machine_type(); 295 setup_arch_string(); 296 setup_boot_command_line(); 297 detect_diag9c(); 298 detect_machine_facilities(); 299 save_vector_registers(); 300 setup_topology(); 301 sclp_early_detect(); 302 setup_low_address_protection(); 303 setup_access_registers(); 304 lockdep_on(); 305 } 306