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/sched/debug.h> 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/asm-extable.h> 22 #include <linux/memblock.h> 23 #include <asm/access-regs.h> 24 #include <asm/diag.h> 25 #include <asm/ebcdic.h> 26 #include <asm/fpu.h> 27 #include <asm/ipl.h> 28 #include <asm/lowcore.h> 29 #include <asm/processor.h> 30 #include <asm/sections.h> 31 #include <asm/setup.h> 32 #include <asm/sysinfo.h> 33 #include <asm/cpcmd.h> 34 #include <asm/sclp.h> 35 #include <asm/facility.h> 36 #include <asm/boot_data.h> 37 #include "entry.h" 38 39 #define decompressor_handled_param(param) \ 40 static int __init ignore_decompressor_param_##param(char *s) \ 41 { \ 42 return 0; \ 43 } \ 44 early_param(#param, ignore_decompressor_param_##param) 45 46 decompressor_handled_param(mem); 47 decompressor_handled_param(vmalloc); 48 decompressor_handled_param(dfltcc); 49 decompressor_handled_param(facilities); 50 decompressor_handled_param(nokaslr); 51 decompressor_handled_param(cmma); 52 decompressor_handled_param(relocate_lowcore); 53 #if IS_ENABLED(CONFIG_KVM) 54 decompressor_handled_param(prot_virt); 55 #endif 56 57 static void __init kasan_early_init(void) 58 { 59 #ifdef CONFIG_KASAN 60 init_task.kasan_depth = 0; 61 sclp_early_printk("KernelAddressSanitizer initialized\n"); 62 #endif 63 } 64 65 static void __init reset_tod_clock(void) 66 { 67 union tod_clock clk; 68 69 if (store_tod_clock_ext_cc(&clk) == 0) 70 return; 71 /* TOD clock not running. Set the clock to Unix Epoch. */ 72 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk)) 73 disabled_wait(); 74 75 memset(&tod_clock_base, 0, sizeof(tod_clock_base)); 76 tod_clock_base.tod = TOD_UNIX_EPOCH; 77 get_lowcore()->last_update_clock = TOD_UNIX_EPOCH; 78 } 79 80 /* 81 * Initialize storage key for kernel pages 82 */ 83 static noinline __init void init_kernel_storage_key(void) 84 { 85 #if PAGE_DEFAULT_KEY 86 unsigned long end_pfn, init_pfn; 87 88 end_pfn = PFN_UP(__pa(_end)); 89 90 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 91 page_set_storage_key(init_pfn << PAGE_SHIFT, 92 PAGE_DEFAULT_KEY, 0); 93 #endif 94 } 95 96 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 97 98 static noinline __init void detect_machine_type(void) 99 { 100 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; 101 102 /* Check current-configuration-level */ 103 if (stsi(NULL, 0, 0, 0) <= 2) { 104 get_lowcore()->machine_flags |= MACHINE_FLAG_LPAR; 105 return; 106 } 107 /* Get virtual-machine cpu information. */ 108 if (stsi(vmms, 3, 2, 2) || !vmms->count) 109 return; 110 111 /* Detect known hypervisors */ 112 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) 113 get_lowcore()->machine_flags |= MACHINE_FLAG_KVM; 114 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4)) 115 get_lowcore()->machine_flags |= MACHINE_FLAG_VM; 116 } 117 118 /* Remove leading, trailing and double whitespace. */ 119 static inline void strim_all(char *str) 120 { 121 char *s; 122 123 s = strim(str); 124 if (s != str) 125 memmove(str, s, strlen(s)); 126 while (*str) { 127 if (!isspace(*str++)) 128 continue; 129 if (isspace(*str)) { 130 s = skip_spaces(str); 131 memmove(str, s, strlen(s) + 1); 132 } 133 } 134 } 135 136 static noinline __init void setup_arch_string(void) 137 { 138 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; 139 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; 140 char mstr[80], hvstr[17]; 141 142 if (stsi(mach, 1, 1, 1)) 143 return; 144 EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); 145 EBCASC(mach->type, sizeof(mach->type)); 146 EBCASC(mach->model, sizeof(mach->model)); 147 EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); 148 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", 149 mach->manufacturer, mach->type, 150 mach->model, mach->model_capacity); 151 strim_all(mstr); 152 if (stsi(vm, 3, 2, 2) == 0 && vm->count) { 153 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); 154 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); 155 strim_all(hvstr); 156 } else { 157 sprintf(hvstr, "%s", 158 MACHINE_IS_LPAR ? "LPAR" : 159 MACHINE_IS_VM ? "z/VM" : 160 MACHINE_IS_KVM ? "KVM" : "unknown"); 161 } 162 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); 163 } 164 165 static __init void setup_topology(void) 166 { 167 int max_mnest; 168 169 if (!test_facility(11)) 170 return; 171 get_lowcore()->machine_flags |= MACHINE_FLAG_TOPOLOGY; 172 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 173 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 174 break; 175 } 176 topology_max_mnest = max_mnest; 177 } 178 179 void __init __do_early_pgm_check(struct pt_regs *regs) 180 { 181 struct lowcore *lc = get_lowcore(); 182 unsigned long ip; 183 184 regs->int_code = lc->pgm_int_code; 185 regs->int_parm_long = lc->trans_exc_code; 186 ip = __rewind_psw(regs->psw, regs->int_code >> 16); 187 188 /* Monitor Event? Might be a warning */ 189 if ((regs->int_code & PGM_INT_CODE_MASK) == 0x40) { 190 if (report_bug(ip, regs) == BUG_TRAP_TYPE_WARN) 191 return; 192 } 193 if (fixup_exception(regs)) 194 return; 195 /* 196 * Unhandled exception - system cannot continue but try to get some 197 * helpful messages to the console. Use early_printk() to print 198 * some basic information in case it is too early for printk(). 199 */ 200 register_early_console(); 201 early_printk("PANIC: early exception %04x PSW: %016lx %016lx\n", 202 regs->int_code & 0xffff, regs->psw.mask, regs->psw.addr); 203 show_regs(regs); 204 disabled_wait(); 205 } 206 207 static noinline __init void setup_lowcore_early(void) 208 { 209 struct lowcore *lc = get_lowcore(); 210 psw_t psw; 211 212 psw.addr = (unsigned long)early_pgm_check_handler; 213 psw.mask = PSW_KERNEL_BITS; 214 lc->program_new_psw = psw; 215 lc->preempt_count = INIT_PREEMPT_COUNT; 216 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); 217 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); 218 } 219 220 static __init void detect_diag9c(void) 221 { 222 unsigned int cpu_address; 223 int rc; 224 225 cpu_address = stap(); 226 diag_stat_inc(DIAG_STAT_X09C); 227 asm volatile( 228 " diag %2,0,0x9c\n" 229 "0: la %0,0\n" 230 "1:\n" 231 EX_TABLE(0b,1b) 232 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 233 if (!rc) 234 get_lowcore()->machine_flags |= MACHINE_FLAG_DIAG9C; 235 } 236 237 static __init void detect_machine_facilities(void) 238 { 239 if (test_facility(8)) { 240 get_lowcore()->machine_flags |= MACHINE_FLAG_EDAT1; 241 system_ctl_set_bit(0, CR0_EDAT_BIT); 242 } 243 if (test_facility(78)) 244 get_lowcore()->machine_flags |= MACHINE_FLAG_EDAT2; 245 if (test_facility(3)) 246 get_lowcore()->machine_flags |= MACHINE_FLAG_IDTE; 247 if (test_facility(50) && test_facility(73)) { 248 get_lowcore()->machine_flags |= MACHINE_FLAG_TE; 249 system_ctl_set_bit(0, CR0_TRANSACTIONAL_EXECUTION_BIT); 250 } 251 if (test_facility(51)) 252 get_lowcore()->machine_flags |= MACHINE_FLAG_TLB_LC; 253 if (test_facility(129)) 254 system_ctl_set_bit(0, CR0_VECTOR_BIT); 255 if (test_facility(130)) 256 get_lowcore()->machine_flags |= MACHINE_FLAG_NX; 257 if (test_facility(133)) 258 get_lowcore()->machine_flags |= MACHINE_FLAG_GS; 259 if (test_facility(139) && (tod_clock_base.tod >> 63)) { 260 /* Enabled signed clock comparator comparisons */ 261 get_lowcore()->machine_flags |= MACHINE_FLAG_SCC; 262 clock_comparator_max = -1ULL >> 1; 263 system_ctl_set_bit(0, CR0_CLOCK_COMPARATOR_SIGN_BIT); 264 } 265 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) { 266 get_lowcore()->machine_flags |= MACHINE_FLAG_PCI_MIO; 267 /* the control bit is set during PCI initialization */ 268 } 269 if (test_facility(194)) 270 get_lowcore()->machine_flags |= MACHINE_FLAG_RDP; 271 if (test_facility(85)) 272 get_lowcore()->machine_flags |= MACHINE_FLAG_SEQ_INSN; 273 } 274 275 static inline void save_vector_registers(void) 276 { 277 #ifdef CONFIG_CRASH_DUMP 278 if (test_facility(129)) 279 save_vx_regs(boot_cpu_vector_save_area); 280 #endif 281 } 282 283 static inline void setup_low_address_protection(void) 284 { 285 system_ctl_set_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT); 286 } 287 288 static inline void setup_access_registers(void) 289 { 290 unsigned int acrs[NUM_ACRS] = { 0 }; 291 292 restore_access_regs(acrs); 293 } 294 295 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 296 static void __init setup_boot_command_line(void) 297 { 298 /* copy arch command line */ 299 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE); 300 } 301 302 static void __init sort_amode31_extable(void) 303 { 304 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table); 305 } 306 307 void __init startup_init(void) 308 { 309 kasan_early_init(); 310 reset_tod_clock(); 311 time_early_init(); 312 init_kernel_storage_key(); 313 lockdep_off(); 314 sort_amode31_extable(); 315 setup_lowcore_early(); 316 detect_machine_type(); 317 setup_arch_string(); 318 setup_boot_command_line(); 319 detect_diag9c(); 320 detect_machine_facilities(); 321 save_vector_registers(); 322 setup_topology(); 323 sclp_early_detect(); 324 setup_low_address_protection(); 325 setup_access_registers(); 326 lockdep_on(); 327 } 328