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/cpufeature.h> 12 #include <linux/compiler.h> 13 #include <linux/init.h> 14 #include <linux/errno.h> 15 #include <linux/string.h> 16 #include <linux/ctype.h> 17 #include <linux/lockdep.h> 18 #include <linux/extable.h> 19 #include <linux/pfn.h> 20 #include <linux/uaccess.h> 21 #include <linux/kernel.h> 22 #include <asm/asm-extable.h> 23 #include <linux/memblock.h> 24 #include <asm/access-regs.h> 25 #include <asm/asm-offsets.h> 26 #include <asm/machine.h> 27 #include <asm/diag.h> 28 #include <asm/ebcdic.h> 29 #include <asm/fpu.h> 30 #include <asm/ipl.h> 31 #include <asm/lowcore.h> 32 #include <asm/processor.h> 33 #include <asm/sections.h> 34 #include <asm/setup.h> 35 #include <asm/sysinfo.h> 36 #include <asm/cpcmd.h> 37 #include <asm/sclp.h> 38 #include <asm/facility.h> 39 #include <asm/boot_data.h> 40 #include "entry.h" 41 42 #define __decompressor_handled_param(func, param) \ 43 static int __init ignore_decompressor_param_##func(char *s) \ 44 { \ 45 return 0; \ 46 } \ 47 early_param(#param, ignore_decompressor_param_##func) 48 49 #define decompressor_handled_param(param) __decompressor_handled_param(param, param) 50 51 decompressor_handled_param(mem); 52 decompressor_handled_param(vmalloc); 53 decompressor_handled_param(dfltcc); 54 decompressor_handled_param(facilities); 55 decompressor_handled_param(nokaslr); 56 decompressor_handled_param(cmma); 57 decompressor_handled_param(relocate_lowcore); 58 decompressor_handled_param(bootdebug); 59 __decompressor_handled_param(debug_alternative, debug-alternative); 60 #if IS_ENABLED(CONFIG_KVM) 61 decompressor_handled_param(prot_virt); 62 #endif 63 64 static void __init kasan_early_init(void) 65 { 66 #ifdef CONFIG_KASAN 67 init_task.kasan_depth = 0; 68 pr_info("KernelAddressSanitizer initialized\n"); 69 #endif 70 } 71 72 /* 73 * Initialize storage key for kernel pages 74 */ 75 static noinline __init void init_kernel_storage_key(void) 76 { 77 #if PAGE_DEFAULT_KEY 78 unsigned long end_pfn, init_pfn; 79 80 end_pfn = PFN_UP(__pa(_end)); 81 82 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 83 page_set_storage_key(init_pfn << PAGE_SHIFT, 84 PAGE_DEFAULT_KEY, 0); 85 #endif 86 } 87 88 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 89 90 /* Remove leading, trailing and double whitespace. */ 91 static inline void strim_all(char *str) 92 { 93 char *s; 94 95 s = strim(str); 96 if (s != str) 97 memmove(str, s, strlen(s)); 98 while (*str) { 99 if (!isspace(*str++)) 100 continue; 101 if (isspace(*str)) { 102 s = skip_spaces(str); 103 memmove(str, s, strlen(s) + 1); 104 } 105 } 106 } 107 108 static noinline __init void setup_arch_string(void) 109 { 110 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; 111 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; 112 char mstr[80], hvstr[17]; 113 114 if (stsi(mach, 1, 1, 1)) 115 return; 116 EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); 117 EBCASC(mach->type, sizeof(mach->type)); 118 EBCASC(mach->model, sizeof(mach->model)); 119 EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); 120 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", 121 mach->manufacturer, mach->type, 122 mach->model, mach->model_capacity); 123 strim_all(mstr); 124 if (stsi(vm, 3, 2, 2) == 0 && vm->count) { 125 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); 126 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); 127 strim_all(hvstr); 128 } else { 129 sprintf(hvstr, "%s", 130 machine_is_lpar() ? "LPAR" : 131 machine_is_vm() ? "z/VM" : 132 machine_is_kvm() ? "KVM" : "unknown"); 133 } 134 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); 135 } 136 137 static __init void setup_topology(void) 138 { 139 int max_mnest; 140 141 if (!cpu_has_topology()) 142 return; 143 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 144 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 145 break; 146 } 147 topology_max_mnest = max_mnest; 148 } 149 150 void __init __do_early_pgm_check(struct pt_regs *regs) 151 { 152 struct lowcore *lc = get_lowcore(); 153 unsigned long ip; 154 155 regs->int_code = lc->pgm_int_code; 156 regs->int_parm_long = lc->trans_exc_code; 157 ip = __rewind_psw(regs->psw, regs->int_code >> 16); 158 159 /* Monitor Event? Might be a warning */ 160 if ((regs->int_code & PGM_INT_CODE_MASK) == 0x40) { 161 if (report_bug(ip, regs) == BUG_TRAP_TYPE_WARN) 162 return; 163 } 164 if (fixup_exception(regs)) 165 return; 166 /* 167 * Unhandled exception - system cannot continue but try to get some 168 * helpful messages to the console. Use early_printk() to print 169 * some basic information in case it is too early for printk(). 170 */ 171 register_early_console(); 172 early_printk("PANIC: early exception %04x PSW: %016lx %016lx\n", 173 regs->int_code & 0xffff, regs->psw.mask, regs->psw.addr); 174 show_regs(regs); 175 disabled_wait(); 176 } 177 178 static noinline __init void setup_lowcore_early(void) 179 { 180 struct lowcore *lc = get_lowcore(); 181 psw_t psw; 182 183 psw.addr = (unsigned long)early_pgm_check_handler; 184 psw.mask = PSW_KERNEL_BITS; 185 lc->program_new_psw = psw; 186 lc->preempt_count = INIT_PREEMPT_COUNT; 187 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); 188 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); 189 } 190 191 static inline void save_vector_registers(void) 192 { 193 #ifdef CONFIG_CRASH_DUMP 194 if (cpu_has_vx()) 195 save_vx_regs(boot_cpu_vector_save_area); 196 #endif 197 } 198 199 static inline void setup_low_address_protection(void) 200 { 201 system_ctl_set_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT); 202 } 203 204 static inline void setup_access_registers(void) 205 { 206 unsigned int acrs[NUM_ACRS] = { 0 }; 207 208 restore_access_regs(acrs); 209 } 210 211 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 212 static void __init setup_boot_command_line(void) 213 { 214 /* copy arch command line */ 215 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE); 216 } 217 218 static void __init sort_amode31_extable(void) 219 { 220 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table); 221 } 222 223 void __init startup_init(void) 224 { 225 kasan_early_init(); 226 time_early_init(); 227 init_kernel_storage_key(); 228 lockdep_off(); 229 sort_amode31_extable(); 230 setup_lowcore_early(); 231 setup_arch_string(); 232 setup_boot_command_line(); 233 save_vector_registers(); 234 setup_topology(); 235 sclp_early_detect(); 236 setup_low_address_protection(); 237 setup_access_registers(); 238 lockdep_on(); 239 } 240