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 int __bootdata(is_full_image); 38 39 static void __init reset_tod_clock(void) 40 { 41 union tod_clock clk; 42 43 if (store_tod_clock_ext_cc(&clk) == 0) 44 return; 45 /* TOD clock not running. Set the clock to Unix Epoch. */ 46 if (set_tod_clock(TOD_UNIX_EPOCH) || store_tod_clock_ext_cc(&clk)) 47 disabled_wait(); 48 49 memset(&tod_clock_base, 0, sizeof(tod_clock_base)); 50 tod_clock_base.tod = TOD_UNIX_EPOCH; 51 S390_lowcore.last_update_clock = TOD_UNIX_EPOCH; 52 } 53 54 /* 55 * Initialize storage key for kernel pages 56 */ 57 static noinline __init void init_kernel_storage_key(void) 58 { 59 #if PAGE_DEFAULT_KEY 60 unsigned long end_pfn, init_pfn; 61 62 end_pfn = PFN_UP(__pa(_end)); 63 64 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 65 page_set_storage_key(init_pfn << PAGE_SHIFT, 66 PAGE_DEFAULT_KEY, 0); 67 #endif 68 } 69 70 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 71 72 static noinline __init void detect_machine_type(void) 73 { 74 struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; 75 76 /* Check current-configuration-level */ 77 if (stsi(NULL, 0, 0, 0) <= 2) { 78 S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; 79 return; 80 } 81 /* Get virtual-machine cpu information. */ 82 if (stsi(vmms, 3, 2, 2) || !vmms->count) 83 return; 84 85 /* Detect known hypervisors */ 86 if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) 87 S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; 88 else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4)) 89 S390_lowcore.machine_flags |= MACHINE_FLAG_VM; 90 } 91 92 /* Remove leading, trailing and double whitespace. */ 93 static inline void strim_all(char *str) 94 { 95 char *s; 96 97 s = strim(str); 98 if (s != str) 99 memmove(str, s, strlen(s)); 100 while (*str) { 101 if (!isspace(*str++)) 102 continue; 103 if (isspace(*str)) { 104 s = skip_spaces(str); 105 memmove(str, s, strlen(s) + 1); 106 } 107 } 108 } 109 110 static noinline __init void setup_arch_string(void) 111 { 112 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; 113 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; 114 char mstr[80], hvstr[17]; 115 116 if (stsi(mach, 1, 1, 1)) 117 return; 118 EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); 119 EBCASC(mach->type, sizeof(mach->type)); 120 EBCASC(mach->model, sizeof(mach->model)); 121 EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); 122 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", 123 mach->manufacturer, mach->type, 124 mach->model, mach->model_capacity); 125 strim_all(mstr); 126 if (stsi(vm, 3, 2, 2) == 0 && vm->count) { 127 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); 128 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); 129 strim_all(hvstr); 130 } else { 131 sprintf(hvstr, "%s", 132 MACHINE_IS_LPAR ? "LPAR" : 133 MACHINE_IS_VM ? "z/VM" : 134 MACHINE_IS_KVM ? "KVM" : "unknown"); 135 } 136 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); 137 } 138 139 static __init void setup_topology(void) 140 { 141 int max_mnest; 142 143 if (!test_facility(11)) 144 return; 145 S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; 146 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 147 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 148 break; 149 } 150 topology_max_mnest = max_mnest; 151 } 152 153 void __do_early_pgm_check(struct pt_regs *regs) 154 { 155 if (!fixup_exception(regs)) 156 disabled_wait(); 157 } 158 159 static noinline __init void setup_lowcore_early(void) 160 { 161 psw_t psw; 162 163 psw.addr = (unsigned long)early_pgm_check_handler; 164 psw.mask = PSW_KERNEL_BITS; 165 S390_lowcore.program_new_psw = psw; 166 S390_lowcore.preempt_count = INIT_PREEMPT_COUNT; 167 } 168 169 static noinline __init void setup_facility_list(void) 170 { 171 memcpy(alt_stfle_fac_list, stfle_fac_list, sizeof(alt_stfle_fac_list)); 172 if (!IS_ENABLED(CONFIG_KERNEL_NOBP)) 173 __clear_facility(82, alt_stfle_fac_list); 174 } 175 176 static __init void detect_diag9c(void) 177 { 178 unsigned int cpu_address; 179 int rc; 180 181 cpu_address = stap(); 182 diag_stat_inc(DIAG_STAT_X09C); 183 asm volatile( 184 " diag %2,0,0x9c\n" 185 "0: la %0,0\n" 186 "1:\n" 187 EX_TABLE(0b,1b) 188 : "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc"); 189 if (!rc) 190 S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C; 191 } 192 193 static __init void detect_machine_facilities(void) 194 { 195 if (test_facility(8)) { 196 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1; 197 __ctl_set_bit(0, 23); 198 } 199 if (test_facility(78)) 200 S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2; 201 if (test_facility(3)) 202 S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; 203 if (test_facility(50) && test_facility(73)) { 204 S390_lowcore.machine_flags |= MACHINE_FLAG_TE; 205 __ctl_set_bit(0, 55); 206 } 207 if (test_facility(51)) 208 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC; 209 if (test_facility(129)) { 210 S390_lowcore.machine_flags |= MACHINE_FLAG_VX; 211 __ctl_set_bit(0, 17); 212 } 213 if (test_facility(130) && !noexec_disabled) { 214 S390_lowcore.machine_flags |= MACHINE_FLAG_NX; 215 __ctl_set_bit(0, 20); 216 } 217 if (test_facility(133)) 218 S390_lowcore.machine_flags |= MACHINE_FLAG_GS; 219 if (test_facility(139) && (tod_clock_base.tod >> 63)) { 220 /* Enabled signed clock comparator comparisons */ 221 S390_lowcore.machine_flags |= MACHINE_FLAG_SCC; 222 clock_comparator_max = -1ULL >> 1; 223 __ctl_set_bit(0, 53); 224 } 225 if (IS_ENABLED(CONFIG_PCI) && test_facility(153)) { 226 S390_lowcore.machine_flags |= MACHINE_FLAG_PCI_MIO; 227 /* the control bit is set during PCI initialization */ 228 } 229 if (test_facility(194)) 230 S390_lowcore.machine_flags |= MACHINE_FLAG_RDP; 231 } 232 233 static inline void save_vector_registers(void) 234 { 235 #ifdef CONFIG_CRASH_DUMP 236 if (test_facility(129)) 237 save_vx_regs(boot_cpu_vector_save_area); 238 #endif 239 } 240 241 static inline void setup_control_registers(void) 242 { 243 unsigned long reg; 244 245 __ctl_store(reg, 0, 0); 246 reg |= CR0_LOW_ADDRESS_PROTECTION; 247 reg |= CR0_EMERGENCY_SIGNAL_SUBMASK; 248 reg |= CR0_EXTERNAL_CALL_SUBMASK; 249 __ctl_load(reg, 0, 0); 250 } 251 252 static inline void setup_access_registers(void) 253 { 254 unsigned int acrs[NUM_ACRS] = { 0 }; 255 256 restore_access_regs(acrs); 257 } 258 259 static int __init disable_vector_extension(char *str) 260 { 261 S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX; 262 __ctl_clear_bit(0, 17); 263 return 0; 264 } 265 early_param("novx", disable_vector_extension); 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 check_image_bootable(void) 275 { 276 if (is_full_image) 277 return; 278 279 sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n"); 280 sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n"); 281 sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n"); 282 disabled_wait(); 283 } 284 285 static void __init sort_amode31_extable(void) 286 { 287 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table); 288 } 289 290 void __init startup_init(void) 291 { 292 reset_tod_clock(); 293 check_image_bootable(); 294 time_early_init(); 295 init_kernel_storage_key(); 296 lockdep_off(); 297 sort_amode31_extable(); 298 setup_lowcore_early(); 299 setup_facility_list(); 300 detect_machine_type(); 301 setup_arch_string(); 302 setup_boot_command_line(); 303 detect_diag9c(); 304 detect_machine_facilities(); 305 save_vector_registers(); 306 setup_topology(); 307 sclp_early_detect(); 308 setup_control_registers(); 309 setup_access_registers(); 310 lockdep_on(); 311 } 312