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   1 /*
   2  *  include/asm-s390/system.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   7  *
   8  *  Derived from "include/asm-i386/system.h"
   9  */
  10
  11 #ifndef __ASM_SYSTEM_H
  12 #define __ASM_SYSTEM_H
  13
  14 #include <linux/config.h>
  15 #include <linux/kernel.h>
  16 #include <asm/types.h>
  17 #include <asm/ptrace.h>
  18 #include <asm/setup.h>
  19 #include <asm/processor.h>
  20
  21 #ifdef __KERNEL__
  22
  23 struct task_struct;
  24
  25 extern struct task_struct *__switch_to(void *, void *);
  26
  27 #ifdef __s390x__
  28 #define __FLAG_SHIFT 56
  29 #else /* ! __s390x__ */
  30 #define __FLAG_SHIFT 24
  31 #endif /* ! __s390x__ */
  32
  33 static inline void save_fp_regs(s390_fp_regs *fpregs)
  34 {
  35         asm volatile (
  36                 "   std   0,8(%1)\n"
  37                 "   std   2,24(%1)\n"
  38                 "   std   4,40(%1)\n"
  39                 "   std   6,56(%1)"
  40                 : "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory" );
  41         if (!MACHINE_HAS_IEEE)
  42                 return;
  43         asm volatile(
  44                 "   stfpc 0(%1)\n"
  45                 "   std   1,16(%1)\n"
  46                 "   std   3,32(%1)\n"
  47                 "   std   5,48(%1)\n"
  48                 "   std   7,64(%1)\n"
  49                 "   std   8,72(%1)\n"
  50                 "   std   9,80(%1)\n"
  51                 "   std   10,88(%1)\n"
  52                 "   std   11,96(%1)\n"
  53                 "   std   12,104(%1)\n"
  54                 "   std   13,112(%1)\n"
  55                 "   std   14,120(%1)\n"
  56                 "   std   15,128(%1)\n"
  57                 : "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory" );
  58 }
  59
  60 static inline void restore_fp_regs(s390_fp_regs *fpregs)
  61 {
  62         asm volatile (
  63                 "   ld    0,8(%0)\n"
  64                 "   ld    2,24(%0)\n"
  65                 "   ld    4,40(%0)\n"
  66                 "   ld    6,56(%0)"
  67                 : : "a" (fpregs), "m" (*fpregs) );
  68         if (!MACHINE_HAS_IEEE)
  69                 return;
  70         asm volatile(
  71                 "   lfpc  0(%0)\n"
  72                 "   ld    1,16(%0)\n"
  73                 "   ld    3,32(%0)\n"
  74                 "   ld    5,48(%0)\n"
  75                 "   ld    7,64(%0)\n"
  76                 "   ld    8,72(%0)\n"
  77                 "   ld    9,80(%0)\n"
  78                 "   ld    10,88(%0)\n"
  79                 "   ld    11,96(%0)\n"
  80                 "   ld    12,104(%0)\n"
  81                 "   ld    13,112(%0)\n"
  82                 "   ld    14,120(%0)\n"
  83                 "   ld    15,128(%0)\n"
  84                 : : "a" (fpregs), "m" (*fpregs) );
  85 }
  86
  87 static inline void save_access_regs(unsigned int *acrs)
  88 {
  89         asm volatile ("stam 0,15,0(%0)" : : "a" (acrs) : "memory" );
  90 }
  91
  92 static inline void restore_access_regs(unsigned int *acrs)
  93 {
  94         asm volatile ("lam 0,15,0(%0)" : : "a" (acrs) );
  95 }
  96
  97 #define switch_to(prev,next,last) do {                                       \
  98         if (prev == next)                                                    \
  99                 break;                                                       \
 100         save_fp_regs(&prev->thread.fp_regs);                                 \
 101         restore_fp_regs(&next->thread.fp_regs);                              \
 102         save_access_regs(&prev->thread.acrs[0]);                             \
 103         restore_access_regs(&next->thread.acrs[0]);                          \
 104         prev = __switch_to(prev,next);                                       \
 105 } while (0)
 106
 107 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 108 extern void account_user_vtime(struct task_struct *);
 109 extern void account_system_vtime(struct task_struct *);
 110 #endif
 111
 112 #define finish_arch_switch(prev) do {                                        \
 113         set_fs(current->thread.mm_segment);                                  \
 114         account_system_vtime(prev);                                          \
 115 } while (0)
 116
 117 #define nop() __asm__ __volatile__ ("nop")
 118
 119 #define xchg(ptr,x) \
 120   ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(void *)(ptr),sizeof(*(ptr))))
 121
 122 static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
 123 {
 124         unsigned long addr, old;
 125         int shift;
 126
 127         switch (size) {
 128         case 1:
 129                 addr = (unsigned long) ptr;
 130                 shift = (3 ^ (addr & 3)) << 3;
 131                 addr ^= addr & 3;
 132                 asm volatile(
 133                         "    l   %0,0(%4)\n"
 134                         "0:  lr  0,%0\n"
 135                         "    nr  0,%3\n"
 136                         "    or  0,%2\n"
 137                         "    cs  %0,0,0(%4)\n"
 138                         "    jl  0b\n"
 139                         : "=&d" (old), "=m" (*(int *) addr)
 140                         : "d" (x << shift), "d" (~(255 << shift)), "a" (addr),
 141                           "m" (*(int *) addr) : "memory", "cc", "0" );
 142                 x = old >> shift;
 143                 break;
 144         case 2:
 145                 addr = (unsigned long) ptr;
 146                 shift = (2 ^ (addr & 2)) << 3;
 147                 addr ^= addr & 2;
 148                 asm volatile(
 149                         "    l   %0,0(%4)\n"
 150                         "0:  lr  0,%0\n"
 151                         "    nr  0,%3\n"
 152                         "    or  0,%2\n"
 153                         "    cs  %0,0,0(%4)\n"
 154                         "    jl  0b\n"
 155                         : "=&d" (old), "=m" (*(int *) addr)
 156                         : "d" (x << shift), "d" (~(65535 << shift)), "a" (addr),
 157                           "m" (*(int *) addr) : "memory", "cc", "0" );
 158                 x = old >> shift;
 159                 break;
 160         case 4:
 161                 asm volatile (
 162                         "    l   %0,0(%3)\n"
 163                         "0:  cs  %0,%2,0(%3)\n"
 164                         "    jl  0b\n"
 165                         : "=&d" (old), "=m" (*(int *) ptr)
 166                         : "d" (x), "a" (ptr), "m" (*(int *) ptr)
 167                         : "memory", "cc" );
 168                 x = old;
 169                 break;
 170 #ifdef __s390x__
 171         case 8:
 172                 asm volatile (
 173                         "    lg  %0,0(%3)\n"
 174                         "0:  csg %0,%2,0(%3)\n"
 175                         "    jl  0b\n"
 176                         : "=&d" (old), "=m" (*(long *) ptr)
 177                         : "d" (x), "a" (ptr), "m" (*(long *) ptr)
 178                         : "memory", "cc" );
 179                 x = old;
 180                 break;
 181 #endif /* __s390x__ */
 182         }
 183         return x;
 184 }
 185
 186 /*
 187  * Atomic compare and exchange.  Compare OLD with MEM, if identical,
 188  * store NEW in MEM.  Return the initial value in MEM.  Success is
 189  * indicated by comparing RETURN with OLD.
 190  */
 191
 192 #define __HAVE_ARCH_CMPXCHG 1
 193
 194 #define cmpxchg(ptr,o,n)\
 195         ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
 196                                         (unsigned long)(n),sizeof(*(ptr))))
 197
 198 static inline unsigned long
 199 __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
 200 {
 201         unsigned long addr, prev, tmp;
 202         int shift;
 203
 204         switch (size) {
 205         case 1:
 206                 addr = (unsigned long) ptr;
 207                 shift = (3 ^ (addr & 3)) << 3;
 208                 addr ^= addr & 3;
 209                 asm volatile(
 210                         "    l   %0,0(%4)\n"
 211                         "0:  nr  %0,%5\n"
 212                         "    lr  %1,%0\n"
 213                         "    or  %0,%2\n"
 214                         "    or  %1,%3\n"
 215                         "    cs  %0,%1,0(%4)\n"
 216                         "    jnl 1f\n"
 217                         "    xr  %1,%0\n"
 218                         "    nr  %1,%5\n"
 219                         "    jnz 0b\n"
 220                         "1:"
 221                         : "=&d" (prev), "=&d" (tmp)
 222                         : "d" (old << shift), "d" (new << shift), "a" (ptr),
 223                           "d" (~(255 << shift))
 224                         : "memory", "cc" );
 225                 return prev >> shift;
 226         case 2:
 227                 addr = (unsigned long) ptr;
 228                 shift = (2 ^ (addr & 2)) << 3;
 229                 addr ^= addr & 2;
 230                 asm volatile(
 231                         "    l   %0,0(%4)\n"
 232                         "0:  nr  %0,%5\n"
 233                         "    lr  %1,%0\n"
 234                         "    or  %0,%2\n"
 235                         "    or  %1,%3\n"
 236                         "    cs  %0,%1,0(%4)\n"
 237                         "    jnl 1f\n"
 238                         "    xr  %1,%0\n"
 239                         "    nr  %1,%5\n"
 240                         "    jnz 0b\n"
 241                         "1:"
 242                         : "=&d" (prev), "=&d" (tmp)
 243                         : "d" (old << shift), "d" (new << shift), "a" (ptr),
 244                           "d" (~(65535 << shift))
 245                         : "memory", "cc" );
 246                 return prev >> shift;
 247         case 4:
 248                 asm volatile (
 249                         "    cs  %0,%2,0(%3)\n"
 250                         : "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
 251                         : "memory", "cc" );
 252                 return prev;
 253 #ifdef __s390x__
 254         case 8:
 255                 asm volatile (
 256                         "    csg %0,%2,0(%3)\n"
 257                         : "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
 258                         : "memory", "cc" );
 259                 return prev;
 260 #endif /* __s390x__ */
 261         }
 262         return old;
 263 }
 264
 265 /*
 266  * Force strict CPU ordering.
 267  * And yes, this is required on UP too when we're talking
 268  * to devices.
 269  *
 270  * This is very similar to the ppc eieio/sync instruction in that is
 271  * does a checkpoint syncronisation & makes sure that
 272  * all memory ops have completed wrt other CPU's ( see 7-15 POP  DJB ).
 273  */
 274
 275 #define eieio()  __asm__ __volatile__ ( "bcr 15,0" : : : "memory" )
 276 # define SYNC_OTHER_CORES(x)   eieio()
 277 #define mb()    eieio()
 278 #define rmb()   eieio()
 279 #define wmb()   eieio()
 280 #define read_barrier_depends() do { } while(0)
 281 #define smp_mb()       mb()
 282 #define smp_rmb()      rmb()
 283 #define smp_wmb()      wmb()
 284 #define smp_read_barrier_depends()    read_barrier_depends()
 285 #define smp_mb__before_clear_bit()     smp_mb()
 286 #define smp_mb__after_clear_bit()      smp_mb()
 287
 288
 289 #define set_mb(var, value)      do { var = value; mb(); } while (0)
 290 #define set_wmb(var, value)     do { var = value; wmb(); } while (0)
 291
 292 /* interrupt control.. */
 293 #define local_irq_enable() ({ \
 294         unsigned long  __dummy; \
 295         __asm__ __volatile__ ( \
 296                 "stosm 0(%1),0x03" \
 297                 : "=m" (__dummy) : "a" (&__dummy) : "memory" ); \
 298         })
 299
 300 #define local_irq_disable() ({ \
 301         unsigned long __flags; \
 302         __asm__ __volatile__ ( \
 303                 "stnsm 0(%1),0xfc" : "=m" (__flags) : "a" (&__flags) ); \
 304         __flags; \
 305         })
 306
 307 #define local_save_flags(x) \
 308         __asm__ __volatile__("stosm 0(%1),0" : "=m" (x) : "a" (&x), "m" (x) )
 309
 310 #define local_irq_restore(x) \
 311         __asm__ __volatile__("ssm   0(%0)" : : "a" (&x), "m" (x) : "memory")
 312
 313 #define irqs_disabled()                 \
 314 ({                                      \
 315         unsigned long flags;            \
 316         local_save_flags(flags);        \
 317         !((flags >> __FLAG_SHIFT) & 3); \
 318 })
 319
 320 #ifdef __s390x__
 321
 322 #define __ctl_load(array, low, high) ({ \
 323         typedef struct { char _[sizeof(array)]; } addrtype; \
 324         __asm__ __volatile__ ( \
 325                 "   bras  1,0f\n" \
 326                 "   lctlg 0,0,0(%0)\n" \
 327                 "0: ex    %1,0(1)" \
 328                 : : "a" (&array), "a" (((low)<<4)+(high)), \
 329                     "m" (*(addrtype *)(array)) : "1" ); \
 330         })
 331
 332 #define __ctl_store(array, low, high) ({ \
 333         typedef struct { char _[sizeof(array)]; } addrtype; \
 334         __asm__ __volatile__ ( \
 335                 "   bras  1,0f\n" \
 336                 "   stctg 0,0,0(%1)\n" \
 337                 "0: ex    %2,0(1)" \
 338                 : "=m" (*(addrtype *)(array)) \
 339                 : "a" (&array), "a" (((low)<<4)+(high)) : "1" ); \
 340         })
 341
 342 #define __ctl_set_bit(cr, bit) ({ \
 343         __u8 __dummy[24]; \
 344         __asm__ __volatile__ ( \
 345                 "    bras  1,0f\n"       /* skip indirect insns */ \
 346                 "    stctg 0,0,0(%1)\n" \
 347                 "    lctlg 0,0,0(%1)\n" \
 348                 "0:  ex    %2,0(1)\n"    /* execute stctl */ \
 349                 "    lg    0,0(%1)\n" \
 350                 "    ogr   0,%3\n"       /* set the bit */ \
 351                 "    stg   0,0(%1)\n" \
 352                 "1:  ex    %2,6(1)"      /* execute lctl */ \
 353                 : "=m" (__dummy) \
 354                 : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \
 355                   "a" (cr*17), "a" (1L<<(bit)) \
 356                 : "cc", "0", "1" ); \
 357         })
 358
 359 #define __ctl_clear_bit(cr, bit) ({ \
 360         __u8 __dummy[16]; \
 361         __asm__ __volatile__ ( \
 362                 "    bras  1,0f\n"       /* skip indirect insns */ \
 363                 "    stctg 0,0,0(%1)\n" \
 364                 "    lctlg 0,0,0(%1)\n" \
 365                 "0:  ex    %2,0(1)\n"    /* execute stctl */ \
 366                 "    lg    0,0(%1)\n" \
 367                 "    ngr   0,%3\n"       /* set the bit */ \
 368                 "    stg   0,0(%1)\n" \
 369                 "1:  ex    %2,6(1)"      /* execute lctl */ \
 370                 : "=m" (__dummy) \
 371                 : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \
 372                   "a" (cr*17), "a" (~(1L<<(bit))) \
 373                 : "cc", "0", "1" ); \
 374         })
 375
 376 #else /* __s390x__ */
 377
 378 #define __ctl_load(array, low, high) ({ \
 379         typedef struct { char _[sizeof(array)]; } addrtype; \
 380         __asm__ __volatile__ ( \
 381                 "   bras  1,0f\n" \
 382                 "   lctl 0,0,0(%0)\n" \
 383                 "0: ex    %1,0(1)" \
 384                 : : "a" (&array), "a" (((low)<<4)+(high)), \
 385                     "m" (*(addrtype *)(array)) : "1" ); \
 386         })
 387
 388 #define __ctl_store(array, low, high) ({ \
 389         typedef struct { char _[sizeof(array)]; } addrtype; \
 390         __asm__ __volatile__ ( \
 391                 "   bras  1,0f\n" \
 392                 "   stctl 0,0,0(%1)\n" \
 393                 "0: ex    %2,0(1)" \
 394                 : "=m" (*(addrtype *)(array)) \
 395                 : "a" (&array), "a" (((low)<<4)+(high)): "1" ); \
 396         })
 397
 398 #define __ctl_set_bit(cr, bit) ({ \
 399         __u8 __dummy[16]; \
 400         __asm__ __volatile__ ( \
 401                 "    bras  1,0f\n"       /* skip indirect insns */ \
 402                 "    stctl 0,0,0(%1)\n" \
 403                 "    lctl  0,0,0(%1)\n" \
 404                 "0:  ex    %2,0(1)\n"    /* execute stctl */ \
 405                 "    l     0,0(%1)\n" \
 406                 "    or    0,%3\n"       /* set the bit */ \
 407                 "    st    0,0(%1)\n" \
 408                 "1:  ex    %2,4(1)"      /* execute lctl */ \
 409                 : "=m" (__dummy) \
 410                 : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \
 411                   "a" (cr*17), "a" (1<<(bit)) \
 412                 : "cc", "0", "1" ); \
 413         })
 414
 415 #define __ctl_clear_bit(cr, bit) ({ \
 416         __u8 __dummy[16]; \
 417         __asm__ __volatile__ ( \
 418                 "    bras  1,0f\n"       /* skip indirect insns */ \
 419                 "    stctl 0,0,0(%1)\n" \
 420                 "    lctl  0,0,0(%1)\n" \
 421                 "0:  ex    %2,0(1)\n"    /* execute stctl */ \
 422                 "    l     0,0(%1)\n" \
 423                 "    nr    0,%3\n"       /* set the bit */ \
 424                 "    st    0,0(%1)\n" \
 425                 "1:  ex    %2,4(1)"      /* execute lctl */ \
 426                 : "=m" (__dummy) \
 427                 : "a" ((((unsigned long) &__dummy) + 7) & ~7UL), \
 428                   "a" (cr*17), "a" (~(1<<(bit))) \
 429                 : "cc", "0", "1" ); \
 430         })
 431 #endif /* __s390x__ */
 432
 433 /* For spinlocks etc */
 434 #define local_irq_save(x)       ((x) = local_irq_disable())
 435
 436 /*
 437  * Use to set psw mask except for the first byte which
 438  * won't be changed by this function.
 439  */
 440 static inline void
 441 __set_psw_mask(unsigned long mask)
 442 {
 443         local_save_flags(mask);
 444         __load_psw_mask(mask);
 445 }
 446
 447 #define local_mcck_enable()  __set_psw_mask(PSW_KERNEL_BITS)
 448 #define local_mcck_disable() __set_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK)
 449
 450 #ifdef CONFIG_SMP
 451
 452 extern void smp_ctl_set_bit(int cr, int bit);
 453 extern void smp_ctl_clear_bit(int cr, int bit);
 454 #define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit)
 455 #define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit)
 456
 457 #else
 458
 459 #define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit)
 460 #define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit)
 461
 462 #endif /* CONFIG_SMP */
 463
 464 extern void (*_machine_restart)(char *command);
 465 extern void (*_machine_halt)(void);
 466 extern void (*_machine_power_off)(void);
 467
 468 #define arch_align_stack(x) (x)
 469
 470 #endif /* __KERNEL__ */
 471
 472 #endif
 473