LXR linux/arch/s390/include/asm/processor.h

   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/const.h>
  16
  17#define CIF_MCCK_PENDING        0       /* machine check handling is pending */
  18#define CIF_ASCE_PRIMARY        1       /* primary asce needs fixup / uaccess */
  19#define CIF_ASCE_SECONDARY      2       /* secondary asce needs fixup / uaccess */
  20#define CIF_NOHZ_DELAY          3       /* delay HZ disable for a tick */
  21#define CIF_FPU                 4       /* restore FPU registers */
  22#define CIF_IGNORE_IRQ          5       /* ignore interrupt (for udelay) */
  23#define CIF_ENABLED_WAIT        6       /* in enabled wait state */
  24#define CIF_MCCK_GUEST          7       /* machine check happening in guest */
  25#define CIF_DEDICATED_CPU       8       /* this CPU is dedicated */
  26
  27#define _CIF_MCCK_PENDING       _BITUL(CIF_MCCK_PENDING)
  28#define _CIF_ASCE_PRIMARY       _BITUL(CIF_ASCE_PRIMARY)
  29#define _CIF_ASCE_SECONDARY     _BITUL(CIF_ASCE_SECONDARY)
  30#define _CIF_NOHZ_DELAY         _BITUL(CIF_NOHZ_DELAY)
  31#define _CIF_FPU                _BITUL(CIF_FPU)
  32#define _CIF_IGNORE_IRQ         _BITUL(CIF_IGNORE_IRQ)
  33#define _CIF_ENABLED_WAIT       _BITUL(CIF_ENABLED_WAIT)
  34#define _CIF_MCCK_GUEST         _BITUL(CIF_MCCK_GUEST)
  35#define _CIF_DEDICATED_CPU      _BITUL(CIF_DEDICATED_CPU)
  36
  37#ifndef __ASSEMBLY__
  38
  39#include <linux/linkage.h>
  40#include <linux/irqflags.h>
  41#include <asm/cpu.h>
  42#include <asm/page.h>
  43#include <asm/ptrace.h>
  44#include <asm/setup.h>
  45#include <asm/runtime_instr.h>
  46#include <asm/fpu/types.h>
  47#include <asm/fpu/internal.h>
  48
  49static inline void set_cpu_flag(int flag)
  50{
  51        S390_lowcore.cpu_flags |= (1UL << flag);
  52}
  53
  54static inline void clear_cpu_flag(int flag)
  55{
  56        S390_lowcore.cpu_flags &= ~(1UL << flag);
  57}
  58
  59static inline int test_cpu_flag(int flag)
  60{
  61        return !!(S390_lowcore.cpu_flags & (1UL << flag));
  62}
  63
  64/*
  65 * Test CIF flag of another CPU. The caller needs to ensure that
  66 * CPU hotplug can not happen, e.g. by disabling preemption.
  67 */
  68static inline int test_cpu_flag_of(int flag, int cpu)
  69{
  70        struct lowcore *lc = lowcore_ptr[cpu];
  71        return !!(lc->cpu_flags & (1UL << flag));
  72}
  73
  74#define arch_needs_cpu() test_cpu_flag(CIF_NOHZ_DELAY)
  75
  76static inline void get_cpu_id(struct cpuid *ptr)
  77{
  78        asm volatile("stidp %0" : "=Q" (*ptr));
  79}
  80
  81void s390_adjust_jiffies(void);
  82void s390_update_cpu_mhz(void);
  83void cpu_detect_mhz_feature(void);
  84
  85extern const struct seq_operations cpuinfo_op;
  86extern int sysctl_ieee_emulation_warnings;
  87extern void execve_tail(void);
  88extern void __bpon(void);
  89
  90/*
  91 * User space process size: 2GB for 31 bit, 4TB or 8PT for 64 bit.
  92 */
  93
  94#define TASK_SIZE_OF(tsk)       (test_tsk_thread_flag(tsk, TIF_31BIT) ? \
  95                                        (1UL << 31) : -PAGE_SIZE)
  96#define TASK_UNMAPPED_BASE      (test_thread_flag(TIF_31BIT) ? \
  97                                        (1UL << 30) : (1UL << 41))
  98#define TASK_SIZE               TASK_SIZE_OF(current)
  99#define TASK_SIZE_MAX           (-PAGE_SIZE)
 100
 101#define STACK_TOP               (test_thread_flag(TIF_31BIT) ? \
 102                                        (1UL << 31) : (1UL << 42))
 103#define STACK_TOP_MAX           (1UL << 42)
 104
 105#define HAVE_ARCH_PICK_MMAP_LAYOUT
 106
 107typedef unsigned int mm_segment_t;
 108
 109/*
 110 * Thread structure
 111 */
 112struct thread_struct {
 113        unsigned int  acrs[NUM_ACRS];
 114        unsigned long ksp;              /* kernel stack pointer             */
 115        unsigned long user_timer;       /* task cputime in user space */
 116        unsigned long guest_timer;      /* task cputime in kvm guest */
 117        unsigned long system_timer;     /* task cputime in kernel space */
 118        unsigned long hardirq_timer;    /* task cputime in hardirq context */
 119        unsigned long softirq_timer;    /* task cputime in softirq context */
 120        unsigned long sys_call_table;   /* system call table address */
 121        mm_segment_t mm_segment;
 122        unsigned long gmap_addr;        /* address of last gmap fault. */
 123        unsigned int gmap_write_flag;   /* gmap fault write indication */
 124        unsigned int gmap_int_code;     /* int code of last gmap fault */
 125        unsigned int gmap_pfault;       /* signal of a pending guest pfault */
 126        /* Per-thread information related to debugging */
 127        struct per_regs per_user;       /* User specified PER registers */
 128        struct per_event per_event;     /* Cause of the last PER trap */
 129        unsigned long per_flags;        /* Flags to control debug behavior */
 130        unsigned int system_call;       /* system call number in signal */
 131        unsigned long last_break;       /* last breaking-event-address. */
 132        /* pfault_wait is used to block the process on a pfault event */
 133        unsigned long pfault_wait;
 134        struct list_head list;
 135        /* cpu runtime instrumentation */
 136        struct runtime_instr_cb *ri_cb;
 137        struct gs_cb *gs_cb;            /* Current guarded storage cb */
 138        struct gs_cb *gs_bc_cb;         /* Broadcast guarded storage cb */
 139        unsigned char trap_tdb[256];    /* Transaction abort diagnose block */
 140        /*
 141         * Warning: 'fpu' is dynamically-sized. It *MUST* be at
 142         * the end.
 143         */
 144        struct fpu fpu;                 /* FP and VX register save area */
 145};
 146
 147/* Flag to disable transactions. */
 148#define PER_FLAG_NO_TE                  1UL
 149/* Flag to enable random transaction aborts. */
 150#define PER_FLAG_TE_ABORT_RAND          2UL
 151/* Flag to specify random transaction abort mode:
 152 * - abort each transaction at a random instruction before TEND if set.
 153 * - abort random transactions at a random instruction if cleared.
 154 */
 155#define PER_FLAG_TE_ABORT_RAND_TEND     4UL
 156
 157typedef struct thread_struct thread_struct;
 158
 159/*
 160 * Stack layout of a C stack frame.
 161 */
 162#ifndef __PACK_STACK
 163struct stack_frame {
 164        unsigned long back_chain;
 165        unsigned long empty1[5];
 166        unsigned long gprs[10];
 167        unsigned int  empty2[8];
 168};
 169#else
 170struct stack_frame {
 171        unsigned long empty1[5];
 172        unsigned int  empty2[8];
 173        unsigned long gprs[10];
 174        unsigned long back_chain;
 175};
 176#endif
 177
 178#define ARCH_MIN_TASKALIGN      8
 179
 180#define INIT_THREAD {                                                   \
 181        .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 182        .fpu.regs = (void *) init_task.thread.fpu.fprs,                 \
 183}
 184
 185/*
 186 * Do necessary setup to start up a new thread.
 187 */
 188#define start_thread(regs, new_psw, new_stackp) do {                    \
 189        regs->psw.mask  = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA;    \
 190        regs->psw.addr  = new_psw;                                      \
 191        regs->gprs[15]  = new_stackp;                                   \
 192        execve_tail();                                                  \
 193} while (0)
 194
 195#define start_thread31(regs, new_psw, new_stackp) do {                  \
 196        regs->psw.mask  = PSW_USER_BITS | PSW_MASK_BA;                  \
 197        regs->psw.addr  = new_psw;                                      \
 198        regs->gprs[15]  = new_stackp;                                   \
 199        crst_table_downgrade(current->mm);                              \
 200        execve_tail();                                                  \
 201} while (0)
 202
 203/* Forward declaration, a strange C thing */
 204struct task_struct;
 205struct mm_struct;
 206struct seq_file;
 207struct pt_regs;
 208
 209typedef int (*dump_trace_func_t)(void *data, unsigned long address, int reliable);
 210void dump_trace(dump_trace_func_t func, void *data,
 211                struct task_struct *task, unsigned long sp);
 212void show_registers(struct pt_regs *regs);
 213
 214void show_cacheinfo(struct seq_file *m);
 215
 216/* Free all resources held by a thread. */
 217static inline void release_thread(struct task_struct *tsk) { }
 218
 219/* Free guarded storage control block */
 220void guarded_storage_release(struct task_struct *tsk);
 221
 222unsigned long get_wchan(struct task_struct *p);
 223#define task_pt_regs(tsk) ((struct pt_regs *) \
 224        (task_stack_page(tsk) + THREAD_SIZE) - 1)
 225#define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 226#define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 227
 228/* Has task runtime instrumentation enabled ? */
 229#define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
 230
 231static inline unsigned long current_stack_pointer(void)
 232{
 233        unsigned long sp;
 234
 235        asm volatile("la %0,0(15)" : "=a" (sp));
 236        return sp;
 237}
 238
 239static __no_kasan_or_inline unsigned short stap(void)
 240{
 241        unsigned short cpu_address;
 242
 243        asm volatile("stap %0" : "=Q" (cpu_address));
 244        return cpu_address;
 245}
 246
 247#define CALL_ARGS_0()                                                   \
 248        register unsigned long r2 asm("2")
 249#define CALL_ARGS_1(arg1)                                               \
 250        register unsigned long r2 asm("2") = (unsigned long)(arg1)
 251#define CALL_ARGS_2(arg1, arg2)                                         \
 252        CALL_ARGS_1(arg1);                                              \
 253        register unsigned long r3 asm("3") = (unsigned long)(arg2)
 254#define CALL_ARGS_3(arg1, arg2, arg3)                                   \
 255        CALL_ARGS_2(arg1, arg2);                                        \
 256        register unsigned long r4 asm("4") = (unsigned long)(arg3)
 257#define CALL_ARGS_4(arg1, arg2, arg3, arg4)                             \
 258        CALL_ARGS_3(arg1, arg2, arg3);                                  \
 259        register unsigned long r4 asm("5") = (unsigned long)(arg4)
 260#define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5)                       \
 261        CALL_ARGS_4(arg1, arg2, arg3, arg4);                            \
 262        register unsigned long r4 asm("6") = (unsigned long)(arg5)
 263
 264#define CALL_FMT_0
 265#define CALL_FMT_1 CALL_FMT_0, "0" (r2)
 266#define CALL_FMT_2 CALL_FMT_1, "d" (r3)
 267#define CALL_FMT_3 CALL_FMT_2, "d" (r4)
 268#define CALL_FMT_4 CALL_FMT_3, "d" (r5)
 269#define CALL_FMT_5 CALL_FMT_4, "d" (r6)
 270
 271#define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory"
 272#define CALL_CLOBBER_4 CALL_CLOBBER_5
 273#define CALL_CLOBBER_3 CALL_CLOBBER_4, "5"
 274#define CALL_CLOBBER_2 CALL_CLOBBER_3, "4"
 275#define CALL_CLOBBER_1 CALL_CLOBBER_2, "3"
 276#define CALL_CLOBBER_0 CALL_CLOBBER_1
 277
 278#define CALL_ON_STACK(fn, stack, nr, args...)                           \
 279({                                                                      \
 280        CALL_ARGS_##nr(args);                                           \
 281        unsigned long prev;                                             \
 282                                                                        \
 283        asm volatile(                                                   \
 284                "       la      %[_prev],0(15)\n"                       \
 285                "       la      15,0(%[_stack])\n"                      \
 286                "       stg     %[_prev],%[_bc](15)\n"                  \
 287                "       brasl   14,%[_fn]\n"                            \
 288                "       la      15,0(%[_prev])\n"                       \
 289                : "+&d" (r2), [_prev] "=&a" (prev)                      \
 290                : [_stack] "a" (stack),                                 \
 291                  [_bc] "i" (offsetof(struct stack_frame, back_chain)), \
 292                  [_fn] "X" (fn) CALL_FMT_##nr : CALL_CLOBBER_##nr);    \
 293        r2;                                                             \
 294})
 295
 296/*
 297 * Give up the time slice of the virtual PU.
 298 */
 299#define cpu_relax_yield cpu_relax_yield
 300void cpu_relax_yield(void);
 301
 302#define cpu_relax() barrier()
 303
 304#define ECAG_CACHE_ATTRIBUTE    0
 305#define ECAG_CPU_ATTRIBUTE      1
 306
 307static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
 308{
 309        unsigned long val;
 310
 311        asm volatile(".insn     rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
 312                     : "=d" (val) : "a" (asi << 8 | parm));
 313        return val;
 314}
 315
 316static inline void psw_set_key(unsigned int key)
 317{
 318        asm volatile("spka 0(%0)" : : "d" (key));
 319}
 320
 321/*
 322 * Set PSW to specified value.
 323 */
 324static inline void __load_psw(psw_t psw)
 325{
 326        asm volatile("lpswe %0" : : "Q" (psw) : "cc");
 327}
 328
 329/*
 330 * Set PSW mask to specified value, while leaving the
 331 * PSW addr pointing to the next instruction.
 332 */
 333static __no_kasan_or_inline void __load_psw_mask(unsigned long mask)
 334{
 335        unsigned long addr;
 336        psw_t psw;
 337
 338        psw.mask = mask;
 339
 340        asm volatile(
 341                "       larl    %0,1f\n"
 342                "       stg     %0,%O1+8(%R1)\n"
 343                "       lpswe   %1\n"
 344                "1:"
 345                : "=&d" (addr), "=Q" (psw) : "Q" (psw) : "memory", "cc");
 346}
 347
 348/*
 349 * Extract current PSW mask
 350 */
 351static inline unsigned long __extract_psw(void)
 352{
 353        unsigned int reg1, reg2;
 354
 355        asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
 356        return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
 357}
 358
 359static inline void local_mcck_enable(void)
 360{
 361        __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
 362}
 363
 364static inline void local_mcck_disable(void)
 365{
 366        __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
 367}
 368
 369/*
 370 * Rewind PSW instruction address by specified number of bytes.
 371 */
 372static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
 373{
 374        unsigned long mask;
 375
 376        mask = (psw.mask & PSW_MASK_EA) ? -1UL :
 377               (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
 378                                          (1UL << 24) - 1;
 379        return (psw.addr - ilc) & mask;
 380}
 381
 382/*
 383 * Function to stop a processor until the next interrupt occurs
 384 */
 385void enabled_wait(void);
 386
 387/*
 388 * Function to drop a processor into disabled wait state
 389 */
 390static inline void __noreturn disabled_wait(unsigned long code)
 391{
 392        psw_t psw;
 393
 394        psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
 395        psw.addr = code;
 396        __load_psw(psw);
 397        while (1);
 398}
 399
 400/*
 401 * Basic Machine Check/Program Check Handler.
 402 */
 403
 404extern void s390_base_mcck_handler(void);
 405extern void s390_base_pgm_handler(void);
 406extern void s390_base_ext_handler(void);
 407
 408extern void (*s390_base_mcck_handler_fn)(void);
 409extern void (*s390_base_pgm_handler_fn)(void);
 410extern void (*s390_base_ext_handler_fn)(void);
 411
 412#define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 413
 414extern int memcpy_real(void *, void *, size_t);
 415extern void memcpy_absolute(void *, void *, size_t);
 416
 417#define mem_assign_absolute(dest, val) do {                     \
 418        __typeof__(dest) __tmp = (val);                         \
 419                                                                \
 420        BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));             \
 421        memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));        \
 422} while (0)
 423
 424extern int s390_isolate_bp(void);
 425extern int s390_isolate_bp_guest(void);
 426
 427#endif /* __ASSEMBLY__ */
 428
 429#endif /* __ASM_S390_PROCESSOR_H */
 430