1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * S390 version 4 * Copyright IBM Corp. 1999 5 * Author(s): Hartmut Penner (hp@de.ibm.com), 6 * Martin Schwidefsky (schwidefsky@de.ibm.com) 7 * 8 * Derived from "include/asm-i386/processor.h" 9 * Copyright (C) 1994, Linus Torvalds 10 */ 11 12 #ifndef __ASM_S390_PROCESSOR_H 13 #define __ASM_S390_PROCESSOR_H 14 15 #include <linux/bits.h> 16 17 #define CIF_NOHZ_DELAY 2 /* delay HZ disable for a tick */ 18 #define CIF_ENABLED_WAIT 5 /* in enabled wait state */ 19 #define CIF_MCCK_GUEST 6 /* machine check happening in guest */ 20 #define CIF_DEDICATED_CPU 7 /* this CPU is dedicated */ 21 22 #define _CIF_NOHZ_DELAY BIT(CIF_NOHZ_DELAY) 23 #define _CIF_ENABLED_WAIT BIT(CIF_ENABLED_WAIT) 24 #define _CIF_MCCK_GUEST BIT(CIF_MCCK_GUEST) 25 #define _CIF_DEDICATED_CPU BIT(CIF_DEDICATED_CPU) 26 27 #define RESTART_FLAG_CTLREGS _AC(1 << 0, U) 28 29 #ifndef __ASSEMBLER__ 30 31 #include <linux/cpumask.h> 32 #include <linux/linkage.h> 33 #include <linux/irqflags.h> 34 #include <linux/instruction_pointer.h> 35 #include <linux/bitops.h> 36 #include <asm/vdso/processor.h> 37 #include <asm/fpu-types.h> 38 #include <asm/cpu.h> 39 #include <asm/page.h> 40 #include <asm/ptrace.h> 41 #include <asm/setup.h> 42 #include <asm/runtime_instr.h> 43 #include <asm/irqflags.h> 44 #include <asm/alternative.h> 45 #include <asm/fault.h> 46 47 struct pcpu { 48 unsigned long ec_mask; /* bit mask for ec_xxx functions */ 49 unsigned long ec_clk; /* sigp timestamp for ec_xxx */ 50 unsigned long flags; /* per CPU flags */ 51 unsigned long capacity; /* cpu capacity for scheduler */ 52 signed char state; /* physical cpu state */ 53 signed char polarization; /* physical polarization */ 54 u16 address; /* physical cpu address */ 55 }; 56 57 DECLARE_PER_CPU(struct pcpu, pcpu_devices); 58 59 typedef long (*sys_call_ptr_t)(struct pt_regs *regs); 60 61 static __always_inline struct pcpu *this_pcpu(void) 62 { 63 return (struct pcpu *)(get_lowcore()->pcpu); 64 } 65 66 static __always_inline void set_cpu_flag(int flag) 67 { 68 set_bit(flag, &this_pcpu()->flags); 69 } 70 71 static __always_inline void clear_cpu_flag(int flag) 72 { 73 clear_bit(flag, &this_pcpu()->flags); 74 } 75 76 static __always_inline bool test_cpu_flag(int flag) 77 { 78 return test_bit(flag, &this_pcpu()->flags); 79 } 80 81 static __always_inline bool test_and_set_cpu_flag(int flag) 82 { 83 return test_and_set_bit(flag, &this_pcpu()->flags); 84 } 85 86 static __always_inline bool test_and_clear_cpu_flag(int flag) 87 { 88 return test_and_clear_bit(flag, &this_pcpu()->flags); 89 } 90 91 /* 92 * Test CIF flag of another CPU. The caller needs to ensure that 93 * CPU hotplug can not happen, e.g. by disabling preemption. 94 */ 95 static __always_inline bool test_cpu_flag_of(int flag, int cpu) 96 { 97 return test_bit(flag, &per_cpu(pcpu_devices, cpu).flags); 98 } 99 100 #define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY) 101 102 static inline void get_cpu_id(struct cpuid *ptr) 103 { 104 asm volatile("stidp %0" : "=Q" (*ptr)); 105 } 106 107 static __always_inline unsigned long get_cpu_timer(void) 108 { 109 unsigned long timer; 110 111 asm volatile("stpt %[timer]" : [timer] "=Q" (timer)); 112 return timer; 113 } 114 115 void s390_adjust_jiffies(void); 116 void s390_update_cpu_mhz(void); 117 void cpu_detect_mhz_feature(void); 118 119 extern const struct seq_operations cpuinfo_op; 120 extern void execve_tail(void); 121 unsigned long vdso_text_size(void); 122 unsigned long vdso_size(void); 123 124 #define TASK_SIZE (TASK_SIZE_MAX) 125 #define TASK_UNMAPPED_BASE (_REGION2_SIZE >> 1) 126 #define TASK_SIZE_MAX (-PAGE_SIZE) 127 128 #define VDSO_BASE (STACK_TOP + PAGE_SIZE) 129 #define VDSO_LIMIT (_REGION2_SIZE) 130 #define STACK_TOP (VDSO_LIMIT - vdso_size() - PAGE_SIZE) 131 #define STACK_TOP_MAX (_REGION2_SIZE - vdso_size() - PAGE_SIZE) 132 133 #define HAVE_ARCH_PICK_MMAP_LAYOUT 134 135 #define __stackleak_poison __stackleak_poison 136 static __always_inline void __stackleak_poison(unsigned long erase_low, 137 unsigned long erase_high, 138 unsigned long poison) 139 { 140 unsigned long tmp, count; 141 142 count = erase_high - erase_low; 143 if (!count) 144 return; 145 asm volatile( 146 " cghi %[count],8\n" 147 " je 2f\n" 148 " aghi %[count],-(8+1)\n" 149 " srlg %[tmp],%[count],8\n" 150 " ltgr %[tmp],%[tmp]\n" 151 " jz 1f\n" 152 "0: stg %[poison],0(%[addr])\n" 153 " mvc 8(256-8,%[addr]),0(%[addr])\n" 154 " la %[addr],256(%[addr])\n" 155 " brctg %[tmp],0b\n" 156 "1: stg %[poison],0(%[addr])\n" 157 " exrl %[count],3f\n" 158 " j 4f\n" 159 "2: stg %[poison],0(%[addr])\n" 160 " j 4f\n" 161 "3: mvc 8(1,%[addr]),0(%[addr])\n" 162 "4:" 163 : [addr] "+&a" (erase_low), [count] "+&a" (count), [tmp] "=&a" (tmp) 164 : [poison] "d" (poison) 165 : "memory", "cc" 166 ); 167 } 168 169 /* 170 * Thread structure 171 */ 172 struct thread_struct { 173 unsigned int acrs[NUM_ACRS]; 174 unsigned long ksp; /* kernel stack pointer */ 175 unsigned long user_timer; /* task cputime in user space */ 176 unsigned long guest_timer; /* task cputime in kvm guest */ 177 unsigned long system_timer; /* task cputime in kernel space */ 178 unsigned long hardirq_timer; /* task cputime in hardirq context */ 179 unsigned long softirq_timer; /* task cputime in softirq context */ 180 union teid gmap_teid; /* address and flags of last gmap fault */ 181 unsigned int gmap_int_code; /* int code of last gmap fault */ 182 int ufpu_flags; /* user fpu flags */ 183 int kfpu_flags; /* kernel fpu flags */ 184 185 /* Per-thread information related to debugging */ 186 struct per_regs per_user; /* User specified PER registers */ 187 struct per_event per_event; /* Cause of the last PER trap */ 188 unsigned long per_flags; /* Flags to control debug behavior */ 189 unsigned int system_call; /* system call number in signal */ 190 unsigned long last_break; /* last breaking-event-address. */ 191 /* pfault_wait is used to block the process on a pfault event */ 192 unsigned long pfault_wait; 193 struct list_head list; 194 /* cpu runtime instrumentation */ 195 struct runtime_instr_cb *ri_cb; 196 struct gs_cb *gs_cb; /* Current guarded storage cb */ 197 struct gs_cb *gs_bc_cb; /* Broadcast guarded storage cb */ 198 struct pgm_tdb trap_tdb; /* Transaction abort diagnose block */ 199 struct fpu ufpu; /* User FP and VX register save area */ 200 struct fpu kfpu; /* Kernel FP and VX register save area */ 201 }; 202 203 /* Flag to disable transactions. */ 204 #define PER_FLAG_NO_TE 1UL 205 /* Flag to enable random transaction aborts. */ 206 #define PER_FLAG_TE_ABORT_RAND 2UL 207 /* Flag to specify random transaction abort mode: 208 * - abort each transaction at a random instruction before TEND if set. 209 * - abort random transactions at a random instruction if cleared. 210 */ 211 #define PER_FLAG_TE_ABORT_RAND_TEND 4UL 212 213 typedef struct thread_struct thread_struct; 214 215 #define ARCH_MIN_TASKALIGN 8 216 217 #define INIT_THREAD { \ 218 .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ 219 .last_break = 1, \ 220 } 221 222 /* 223 * Do necessary setup to start up a new thread. 224 */ 225 #define start_thread(regs, new_psw, new_stackp) do { \ 226 regs->psw.mask = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA; \ 227 regs->psw.addr = new_psw; \ 228 regs->gprs[15] = new_stackp; \ 229 execve_tail(); \ 230 } while (0) 231 232 #define start_thread31(regs, new_psw, new_stackp) do { \ 233 regs->psw.mask = PSW_USER_BITS | PSW_MASK_BA; \ 234 regs->psw.addr = new_psw; \ 235 regs->gprs[15] = new_stackp; \ 236 execve_tail(); \ 237 } while (0) 238 239 struct task_struct; 240 struct mm_struct; 241 struct seq_file; 242 struct pt_regs; 243 244 void show_registers(struct pt_regs *regs); 245 void show_cacheinfo(struct seq_file *m); 246 247 /* Free guarded storage control block */ 248 void guarded_storage_release(struct task_struct *tsk); 249 void gs_load_bc_cb(struct pt_regs *regs); 250 251 unsigned long __get_wchan(struct task_struct *p); 252 #define task_pt_regs(tsk) ((struct pt_regs *) \ 253 (task_stack_page(tsk) + THREAD_SIZE) - 1) 254 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->psw.addr) 255 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->gprs[15]) 256 257 /* Has task runtime instrumentation enabled ? */ 258 #define is_ri_task(tsk) (!!(tsk)->thread.ri_cb) 259 260 /* avoid using global register due to gcc bug in versions < 8.4 */ 261 #define current_stack_pointer (__current_stack_pointer()) 262 263 static __always_inline unsigned long __current_stack_pointer(void) 264 { 265 unsigned long sp; 266 267 asm volatile("lgr %0,15" : "=d" (sp)); 268 return sp; 269 } 270 271 static __always_inline bool on_thread_stack(void) 272 { 273 unsigned long ksp = get_lowcore()->kernel_stack; 274 275 return !((ksp ^ current_stack_pointer) & ~(THREAD_SIZE - 1)); 276 } 277 278 static __always_inline unsigned short stap(void) 279 { 280 unsigned short cpu_address; 281 282 asm volatile("stap %0" : "=Q" (cpu_address)); 283 return cpu_address; 284 } 285 286 #define ECAG_CACHE_ATTRIBUTE 0 287 #define ECAG_CPU_ATTRIBUTE 1 288 289 static inline unsigned long __ecag(unsigned int asi, unsigned char parm) 290 { 291 unsigned long val; 292 293 asm volatile("ecag %0,0,0(%1)" : "=d" (val) : "a" (asi << 8 | parm)); 294 return val; 295 } 296 297 static inline void psw_set_key(unsigned int key) 298 { 299 asm volatile("spka 0(%0)" : : "d" (key)); 300 } 301 302 /* 303 * Set PSW to specified value. 304 */ 305 static inline void __load_psw(psw_t psw) 306 { 307 asm volatile("lpswe %0" : : "Q" (psw) : "cc"); 308 } 309 310 /* 311 * Set PSW mask to specified value, while leaving the 312 * PSW addr pointing to the next instruction. 313 */ 314 static __always_inline void __load_psw_mask(unsigned long mask) 315 { 316 psw_t psw __uninitialized; 317 unsigned long addr; 318 319 psw.mask = mask; 320 321 asm volatile( 322 " larl %0,1f\n" 323 " stg %0,%1\n" 324 " lpswe %2\n" 325 "1:" 326 : "=&d" (addr), "=Q" (psw.addr) : "Q" (psw) : "memory", "cc"); 327 } 328 329 /* 330 * Extract current PSW mask 331 */ 332 static inline unsigned long __extract_psw(void) 333 { 334 unsigned int reg1, reg2; 335 336 asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2)); 337 return (((unsigned long) reg1) << 32) | ((unsigned long) reg2); 338 } 339 340 static inline unsigned long __local_mcck_save(void) 341 { 342 unsigned long mask = __extract_psw(); 343 344 __load_psw_mask(mask & ~PSW_MASK_MCHECK); 345 return mask & PSW_MASK_MCHECK; 346 } 347 348 #define local_mcck_save(mflags) \ 349 do { \ 350 typecheck(unsigned long, mflags); \ 351 mflags = __local_mcck_save(); \ 352 } while (0) 353 354 static inline void local_mcck_restore(unsigned long mflags) 355 { 356 unsigned long mask = __extract_psw(); 357 358 mask &= ~PSW_MASK_MCHECK; 359 __load_psw_mask(mask | mflags); 360 } 361 362 static inline void local_mcck_disable(void) 363 { 364 __local_mcck_save(); 365 } 366 367 static inline void local_mcck_enable(void) 368 { 369 __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK); 370 } 371 372 /* 373 * Rewind PSW instruction address by specified number of bytes. 374 */ 375 static inline unsigned long __rewind_psw(psw_t psw, long ilen) 376 { 377 unsigned long mask; 378 379 mask = (psw.mask & PSW_MASK_EA) ? -1UL : 380 (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 : 381 (1UL << 24) - 1; 382 return (psw.addr - ilen) & mask; 383 } 384 385 static inline unsigned long __forward_psw(psw_t psw, long ilen) 386 { 387 return __rewind_psw(psw, -ilen); 388 } 389 390 /* 391 * Function to drop a processor into disabled wait state 392 */ 393 static __always_inline void __noreturn disabled_wait(void) 394 { 395 psw_t psw; 396 397 psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA; 398 psw.addr = _THIS_IP_; 399 __load_psw(psw); 400 while (1); 401 } 402 403 #define ARCH_LOW_ADDRESS_LIMIT 0x7fffffffUL 404 405 static __always_inline bool regs_irqs_disabled(struct pt_regs *regs) 406 { 407 return arch_irqs_disabled_flags(regs->psw.mask); 408 } 409 410 static __always_inline void bpon(void) 411 { 412 asm_inline volatile( 413 ALTERNATIVE(" nop\n", 414 " .insn rrf,0xb2e80000,0,0,13,0\n", 415 ALT_SPEC(82)) 416 ); 417 } 418 419 #endif /* __ASSEMBLER__ */ 420 421 #endif /* __ASM_S390_PROCESSOR_H */ 422