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