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
  49 static inline void set_cpu_flag(int flag)
  50 {
  51         S390_lowcore.cpu_flags |= (1UL << flag);
  52 }
  53
  54 static inline void clear_cpu_flag(int flag)
  55 {
  56         S390_lowcore.cpu_flags &= ~(1UL << flag);
  57 }
  58
  59 static 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  */
  68 static 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
  76 static inline void get_cpu_id(struct cpuid *ptr)
  77 {
  78         asm volatile("stidp %0" : "=Q" (*ptr));
  79 }
  80
  81 void s390_adjust_jiffies(void);
  82 void s390_update_cpu_mhz(void);
  83 void cpu_detect_mhz_feature(void);
  84
  85 extern const struct seq_operations cpuinfo_op;
  86 extern int sysctl_ieee_emulation_warnings;
  87 extern void execve_tail(void);
  88 extern 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
 107 typedef unsigned int mm_segment_t;
 108
 109 /*
 110  * Thread structure
 111  */
 112 struct 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
 157 typedef struct thread_struct thread_struct;
 158
 159 #define ARCH_MIN_TASKALIGN      8
 160
 161 #define INIT_THREAD {                                                   \
 162         .ksp = sizeof(init_stack) + (unsigned long) &init_stack,        \
 163         .fpu.regs = (void *) init_task.thread.fpu.fprs,                 \
 164 }
 165
 166 /*
 167  * Do necessary setup to start up a new thread.
 168  */
 169 #define start_thread(regs, new_psw, new_stackp) do {                    \
 170         regs->psw.mask  = PSW_USER_BITS | PSW_MASK_EA | PSW_MASK_BA;    \
 171         regs->psw.addr  = new_psw;                                      \
 172         regs->gprs[15]  = new_stackp;                                   \
 173         execve_tail();                                                  \
 174 } while (0)
 175
 176 #define start_thread31(regs, new_psw, new_stackp) do {                  \
 177         regs->psw.mask  = PSW_USER_BITS | PSW_MASK_BA;                  \
 178         regs->psw.addr  = new_psw;                                      \
 179         regs->gprs[15]  = new_stackp;                                   \
 180         crst_table_downgrade(current->mm);                              \
 181         execve_tail();                                                  \
 182 } while (0)
 183
 184 /* Forward declaration, a strange C thing */
 185 struct task_struct;
 186 struct mm_struct;
 187 struct seq_file;
 188 struct pt_regs;
 189
 190 void show_registers(struct pt_regs *regs);
 191 void show_cacheinfo(struct seq_file *m);
 192
 193 /* Free all resources held by a thread. */
 194 static inline void release_thread(struct task_struct *tsk) { }
 195
 196 /* Free guarded storage control block */
 197 void guarded_storage_release(struct task_struct *tsk);
 198
 199 unsigned long get_wchan(struct task_struct *p);
 200 #define task_pt_regs(tsk) ((struct pt_regs *) \
 201         (task_stack_page(tsk) + THREAD_SIZE) - 1)
 202 #define KSTK_EIP(tsk)   (task_pt_regs(tsk)->psw.addr)
 203 #define KSTK_ESP(tsk)   (task_pt_regs(tsk)->gprs[15])
 204
 205 /* Has task runtime instrumentation enabled ? */
 206 #define is_ri_task(tsk) (!!(tsk)->thread.ri_cb)
 207
 208 static inline unsigned long current_stack_pointer(void)
 209 {
 210         unsigned long sp;
 211
 212         asm volatile("la %0,0(15)" : "=a" (sp));
 213         return sp;
 214 }
 215
 216 static __no_kasan_or_inline unsigned short stap(void)
 217 {
 218         unsigned short cpu_address;
 219
 220         asm volatile("stap %0" : "=Q" (cpu_address));
 221         return cpu_address;
 222 }
 223
 224 /*
 225  * Give up the time slice of the virtual PU.
 226  */
 227 #define cpu_relax_yield cpu_relax_yield
 228 void cpu_relax_yield(void);
 229
 230 #define cpu_relax() barrier()
 231
 232 #define ECAG_CACHE_ATTRIBUTE    0
 233 #define ECAG_CPU_ATTRIBUTE      1
 234
 235 static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
 236 {
 237         unsigned long val;
 238
 239         asm volatile(".insn     rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
 240                      : "=d" (val) : "a" (asi << 8 | parm));
 241         return val;
 242 }
 243
 244 static inline void psw_set_key(unsigned int key)
 245 {
 246         asm volatile("spka 0(%0)" : : "d" (key));
 247 }
 248
 249 /*
 250  * Set PSW to specified value.
 251  */
 252 static inline void __load_psw(psw_t psw)
 253 {
 254         asm volatile("lpswe %0" : : "Q" (psw) : "cc");
 255 }
 256
 257 /*
 258  * Set PSW mask to specified value, while leaving the
 259  * PSW addr pointing to the next instruction.
 260  */
 261 static __no_kasan_or_inline void __load_psw_mask(unsigned long mask)
 262 {
 263         unsigned long addr;
 264         psw_t psw;
 265
 266         psw.mask = mask;
 267
 268         asm volatile(
 269                 "       larl    %0,1f\n"
 270                 "       stg     %0,%1\n"
 271                 "       lpswe   %2\n"
 272                 "1:"
 273                 : "=&d" (addr), "=Q" (psw.addr) : "Q" (psw) : "memory", "cc");
 274 }
 275
 276 /*
 277  * Extract current PSW mask
 278  */
 279 static inline unsigned long __extract_psw(void)
 280 {
 281         unsigned int reg1, reg2;
 282
 283         asm volatile("epsw %0,%1" : "=d" (reg1), "=a" (reg2));
 284         return (((unsigned long) reg1) << 32) | ((unsigned long) reg2);
 285 }
 286
 287 static inline void local_mcck_enable(void)
 288 {
 289         __load_psw_mask(__extract_psw() | PSW_MASK_MCHECK);
 290 }
 291
 292 static inline void local_mcck_disable(void)
 293 {
 294         __load_psw_mask(__extract_psw() & ~PSW_MASK_MCHECK);
 295 }
 296
 297 /*
 298  * Rewind PSW instruction address by specified number of bytes.
 299  */
 300 static inline unsigned long __rewind_psw(psw_t psw, unsigned long ilc)
 301 {
 302         unsigned long mask;
 303
 304         mask = (psw.mask & PSW_MASK_EA) ? -1UL :
 305                (psw.mask & PSW_MASK_BA) ? (1UL << 31) - 1 :
 306                                           (1UL << 24) - 1;
 307         return (psw.addr - ilc) & mask;
 308 }
 309
 310 /*
 311  * Function to stop a processor until the next interrupt occurs
 312  */
 313 void enabled_wait(void);
 314
 315 /*
 316  * Function to drop a processor into disabled wait state
 317  */
 318 static inline void __noreturn disabled_wait(void)
 319 {
 320         psw_t psw;
 321
 322         psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
 323         psw.addr = _THIS_IP_;
 324         __load_psw(psw);
 325         while (1);
 326 }
 327
 328 /*
 329  * Basic Machine Check/Program Check Handler.
 330  */
 331
 332 extern void s390_base_mcck_handler(void);
 333 extern void s390_base_pgm_handler(void);
 334 extern void s390_base_ext_handler(void);
 335
 336 extern void (*s390_base_mcck_handler_fn)(void);
 337 extern void (*s390_base_pgm_handler_fn)(void);
 338 extern void (*s390_base_ext_handler_fn)(void);
 339
 340 #define ARCH_LOW_ADDRESS_LIMIT  0x7fffffffUL
 341
 342 extern int memcpy_real(void *, void *, size_t);
 343 extern void memcpy_absolute(void *, void *, size_t);
 344
 345 #define mem_assign_absolute(dest, val) do {                     \
 346         __typeof__(dest) __tmp = (val);                         \
 347                                                                 \
 348         BUILD_BUG_ON(sizeof(__tmp) != sizeof(val));             \
 349         memcpy_absolute(&(dest), &__tmp, sizeof(__tmp));        \
 350 } while (0)
 351
 352 extern int s390_isolate_bp(void);
 353 extern int s390_isolate_bp_guest(void);
 354
 355 #endif /* __ASSEMBLY__ */
 356
 357 #endif /* __ASM_S390_PROCESSOR_H */