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 <linux/kasan.h> 25 #include <asm/access-regs.h> 26 #include <asm/asm-offsets.h> 27 #include <asm/machine.h> 28 #include <asm/diag.h> 29 #include <asm/ebcdic.h> 30 #include <asm/fpu.h> 31 #include <asm/ipl.h> 32 #include <asm/lowcore.h> 33 #include <asm/processor.h> 34 #include <asm/sections.h> 35 #include <asm/setup.h> 36 #include <asm/sysinfo.h> 37 #include <asm/cpcmd.h> 38 #include <asm/sclp.h> 39 #include <asm/facility.h> 40 #include <asm/boot_data.h> 41 #include "entry.h" 42 43 #define __decompressor_handled_param(func, param) \ 44 static int __init ignore_decompressor_param_##func(char *s) \ 45 { \ 46 return 0; \ 47 } \ 48 early_param(#param, ignore_decompressor_param_##func) 49 50 #define decompressor_handled_param(param) __decompressor_handled_param(param, param) 51 52 decompressor_handled_param(mem); 53 decompressor_handled_param(vmalloc); 54 decompressor_handled_param(dfltcc); 55 decompressor_handled_param(facilities); 56 decompressor_handled_param(nokaslr); 57 decompressor_handled_param(cmma); 58 decompressor_handled_param(relocate_lowcore); 59 decompressor_handled_param(bootdebug); 60 __decompressor_handled_param(debug_alternative, debug-alternative); 61 #if IS_ENABLED(CONFIG_KVM) 62 decompressor_handled_param(prot_virt); 63 #endif 64 65 static void __init kasan_early_init(void) 66 { 67 #ifdef CONFIG_KASAN 68 init_task.kasan_depth = 0; 69 kasan_init_generic(); 70 #endif 71 } 72 73 /* 74 * Initialize storage key for kernel pages 75 */ 76 static noinline __init void init_kernel_storage_key(void) 77 { 78 #if PAGE_DEFAULT_KEY 79 unsigned long end_pfn, init_pfn; 80 81 end_pfn = PFN_UP(__pa(_end)); 82 83 for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++) 84 page_set_storage_key(init_pfn << PAGE_SHIFT, 85 PAGE_DEFAULT_KEY, 0); 86 #endif 87 } 88 89 static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); 90 91 /* Remove leading, trailing and double whitespace. */ 92 static inline void strim_all(char *str) 93 { 94 char *s; 95 96 s = strim(str); 97 if (s != str) 98 memmove(str, s, strlen(s)); 99 while (*str) { 100 if (!isspace(*str++)) 101 continue; 102 if (isspace(*str)) { 103 s = skip_spaces(str); 104 memmove(str, s, strlen(s) + 1); 105 } 106 } 107 } 108 109 char arch_hw_string[128]; 110 111 static noinline __init void setup_arch_string(void) 112 { 113 struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page; 114 struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page; 115 char mstr[80], hvstr[17]; 116 117 if (stsi(mach, 1, 1, 1)) 118 return; 119 EBCASC(mach->manufacturer, sizeof(mach->manufacturer)); 120 EBCASC(mach->type, sizeof(mach->type)); 121 EBCASC(mach->model, sizeof(mach->model)); 122 EBCASC(mach->model_capacity, sizeof(mach->model_capacity)); 123 sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s", 124 mach->manufacturer, mach->type, 125 mach->model, mach->model_capacity); 126 strim_all(mstr); 127 if (stsi(vm, 3, 2, 2) == 0 && vm->count) { 128 EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi)); 129 sprintf(hvstr, "%-16.16s", vm->vm[0].cpi); 130 strim_all(hvstr); 131 } else { 132 sprintf(hvstr, "%s", 133 machine_is_lpar() ? "LPAR" : 134 machine_is_vm() ? "z/VM" : 135 machine_is_kvm() ? "KVM" : "unknown"); 136 } 137 sprintf(arch_hw_string, "HW: %s (%s)", mstr, hvstr); 138 dump_stack_set_arch_desc("%s (%s)", mstr, hvstr); 139 } 140 141 static __init void setup_topology(void) 142 { 143 int max_mnest; 144 145 if (!cpu_has_topology()) 146 return; 147 for (max_mnest = 6; max_mnest > 1; max_mnest--) { 148 if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0) 149 break; 150 } 151 topology_max_mnest = max_mnest; 152 } 153 154 void __init __do_early_pgm_check(struct pt_regs *regs) 155 { 156 struct lowcore *lc = get_lowcore(); 157 unsigned long ip; 158 159 regs->int_code = lc->pgm_int_code; 160 regs->int_parm_long = lc->trans_exc_code; 161 regs->last_break = lc->pgm_last_break; 162 ip = __rewind_psw(regs->psw, regs->int_code >> 16); 163 164 /* Monitor Event? Might be a warning */ 165 if ((regs->int_code & PGM_INT_CODE_MASK) == 0x40) { 166 if (report_bug(ip, regs) == BUG_TRAP_TYPE_WARN) 167 return; 168 } 169 if (fixup_exception(regs)) 170 return; 171 /* 172 * Unhandled exception - system cannot continue but try to get some 173 * helpful messages to the console. Use early_printk() to print 174 * some basic information in case it is too early for printk(). 175 */ 176 register_early_console(); 177 early_printk("PANIC: early exception %04x PSW: %016lx %016lx\n", 178 regs->int_code & 0xffff, regs->psw.mask, regs->psw.addr); 179 show_regs(regs); 180 disabled_wait(); 181 } 182 183 static noinline __init void setup_lowcore_early(void) 184 { 185 struct lowcore *lc = get_lowcore(); 186 psw_t psw; 187 188 psw.addr = (unsigned long)early_pgm_check_handler; 189 psw.mask = PSW_KERNEL_BITS; 190 lc->program_new_psw = psw; 191 lc->preempt_count = INIT_PREEMPT_COUNT; 192 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); 193 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); 194 } 195 196 static inline void save_vector_registers(void) 197 { 198 #ifdef CONFIG_CRASH_DUMP 199 if (cpu_has_vx()) 200 save_vx_regs(boot_cpu_vector_save_area); 201 #endif 202 } 203 204 static inline void setup_low_address_protection(void) 205 { 206 system_ctl_set_bit(0, CR0_LOW_ADDRESS_PROTECTION_BIT); 207 } 208 209 static inline void setup_access_registers(void) 210 { 211 unsigned int acrs[NUM_ACRS] = { 0 }; 212 213 restore_access_regs(acrs); 214 } 215 216 char __bootdata(early_command_line)[COMMAND_LINE_SIZE]; 217 static void __init setup_boot_command_line(void) 218 { 219 /* copy arch command line */ 220 strscpy(boot_command_line, early_command_line, COMMAND_LINE_SIZE); 221 } 222 223 static void __init sort_amode31_extable(void) 224 { 225 sort_extable(__start_amode31_ex_table, __stop_amode31_ex_table); 226 } 227 228 void __init startup_init(void) 229 { 230 kasan_early_init(); 231 time_early_init(); 232 init_kernel_storage_key(); 233 lockdep_off(); 234 sort_amode31_extable(); 235 setup_lowcore_early(); 236 setup_arch_string(); 237 setup_boot_command_line(); 238 save_vector_registers(); 239 setup_topology(); 240 sclp_early_detect(); 241 setup_low_address_protection(); 242 setup_access_registers(); 243 lockdep_on(); 244 } 245