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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/kernel.h>
  15 #include <asm/types.h>
  16 #include <asm/ptrace.h>
  17 #include <asm/setup.h>
  18 #include <asm/processor.h>
  19
  20 #ifdef __KERNEL__
  21
  22 struct task_struct;
  23
  24 extern struct task_struct *__switch_to(void *, void *);
  25
  26 static inline void save_fp_regs(s390_fp_regs *fpregs)
  27 {
  28         asm volatile(
  29                 "       std     0,8(%1)\n"
  30                 "       std     2,24(%1)\n"
  31                 "       std     4,40(%1)\n"
  32                 "       std     6,56(%1)"
  33                 : "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory");
  34         if (!MACHINE_HAS_IEEE)
  35                 return;
  36         asm volatile(
  37                 "       stfpc   0(%1)\n"
  38                 "       std     1,16(%1)\n"
  39                 "       std     3,32(%1)\n"
  40                 "       std     5,48(%1)\n"
  41                 "       std     7,64(%1)\n"
  42                 "       std     8,72(%1)\n"
  43                 "       std     9,80(%1)\n"
  44                 "       std     10,88(%1)\n"
  45                 "       std     11,96(%1)\n"
  46                 "       std     12,104(%1)\n"
  47                 "       std     13,112(%1)\n"
  48                 "       std     14,120(%1)\n"
  49                 "       std     15,128(%1)\n"
  50                 : "=m" (*fpregs) : "a" (fpregs), "m" (*fpregs) : "memory");
  51 }
  52
  53 static inline void restore_fp_regs(s390_fp_regs *fpregs)
  54 {
  55         asm volatile(
  56                 "       ld      0,8(%0)\n"
  57                 "       ld      2,24(%0)\n"
  58                 "       ld      4,40(%0)\n"
  59                 "       ld      6,56(%0)"
  60                 : : "a" (fpregs), "m" (*fpregs));
  61         if (!MACHINE_HAS_IEEE)
  62                 return;
  63         asm volatile(
  64                 "       lfpc    0(%0)\n"
  65                 "       ld      1,16(%0)\n"
  66                 "       ld      3,32(%0)\n"
  67                 "       ld      5,48(%0)\n"
  68                 "       ld      7,64(%0)\n"
  69                 "       ld      8,72(%0)\n"
  70                 "       ld      9,80(%0)\n"
  71                 "       ld      10,88(%0)\n"
  72                 "       ld      11,96(%0)\n"
  73                 "       ld      12,104(%0)\n"
  74                 "       ld      13,112(%0)\n"
  75                 "       ld      14,120(%0)\n"
  76                 "       ld      15,128(%0)\n"
  77                 : : "a" (fpregs), "m" (*fpregs));
  78 }
  79
  80 static inline void save_access_regs(unsigned int *acrs)
  81 {
  82         asm volatile("stam 0,15,0(%0)" : : "a" (acrs) : "memory");
  83 }
  84
  85 static inline void restore_access_regs(unsigned int *acrs)
  86 {
  87         asm volatile("lam 0,15,0(%0)" : : "a" (acrs));
  88 }
  89
  90 #define switch_to(prev,next,last) do {                                       \
  91         if (prev == next)                                                    \
  92                 break;                                                       \
  93         save_fp_regs(&prev->thread.fp_regs);                                 \
  94         restore_fp_regs(&next->thread.fp_regs);                              \
  95         save_access_regs(&prev->thread.acrs[0]);                             \
  96         restore_access_regs(&next->thread.acrs[0]);                          \
  97         prev = __switch_to(prev,next);                                       \
  98 } while (0)
  99
 100 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 101 extern void account_vtime(struct task_struct *);
 102 extern void account_tick_vtime(struct task_struct *);
 103 extern void account_system_vtime(struct task_struct *);
 104 #else
 105 #define account_vtime(x) do { /* empty */ } while (0)
 106 #endif
 107
 108 #ifdef CONFIG_PFAULT
 109 extern void pfault_irq_init(void);
 110 extern int pfault_init(void);
 111 extern void pfault_fini(void);
 112 #else /* CONFIG_PFAULT */
 113 #define pfault_irq_init()       do { } while (0)
 114 #define pfault_init()           ({-1;})
 115 #define pfault_fini()           do { } while (0)
 116 #endif /* CONFIG_PFAULT */
 117
 118 #define finish_arch_switch(prev) do {                                        \
 119         set_fs(current->thread.mm_segment);                                  \
 120         account_vtime(prev);                                                 \
 121 } while (0)
 122
 123 #define nop() asm volatile("nop")
 124
 125 #define xchg(ptr,x)                                                       \
 126 ({                                                                        \
 127         __typeof__(*(ptr)) __ret;                                         \
 128         __ret = (__typeof__(*(ptr)))                                      \
 129                 __xchg((unsigned long)(x), (void *)(ptr),sizeof(*(ptr))); \
 130         __ret;                                                            \
 131 })
 132
 133 static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
 134 {
 135         unsigned long addr, old;
 136         int shift;
 137
 138         switch (size) {
 139         case 1:
 140                 addr = (unsigned long) ptr;
 141                 shift = (3 ^ (addr & 3)) << 3;
 142                 addr ^= addr & 3;
 143                 asm volatile(
 144                         "       l       %0,0(%4)\n"
 145                         "0:     lr      0,%0\n"
 146                         "       nr      0,%3\n"
 147                         "       or      0,%2\n"
 148                         "       cs      %0,0,0(%4)\n"
 149                         "       jl      0b\n"
 150                         : "=&d" (old), "=m" (*(int *) addr)
 151                         : "d" (x << shift), "d" (~(255 << shift)), "a" (addr),
 152                           "m" (*(int *) addr) : "memory", "cc", "0");
 153                 x = old >> shift;
 154                 break;
 155         case 2:
 156                 addr = (unsigned long) ptr;
 157                 shift = (2 ^ (addr & 2)) << 3;
 158                 addr ^= addr & 2;
 159                 asm volatile(
 160                         "       l       %0,0(%4)\n"
 161                         "0:     lr      0,%0\n"
 162                         "       nr      0,%3\n"
 163                         "       or      0,%2\n"
 164                         "       cs      %0,0,0(%4)\n"
 165                         "       jl      0b\n"
 166                         : "=&d" (old), "=m" (*(int *) addr)
 167                         : "d" (x << shift), "d" (~(65535 << shift)), "a" (addr),
 168                           "m" (*(int *) addr) : "memory", "cc", "0");
 169                 x = old >> shift;
 170                 break;
 171         case 4:
 172                 asm volatile(
 173                         "       l       %0,0(%3)\n"
 174                         "0:     cs      %0,%2,0(%3)\n"
 175                         "       jl      0b\n"
 176                         : "=&d" (old), "=m" (*(int *) ptr)
 177                         : "d" (x), "a" (ptr), "m" (*(int *) ptr)
 178                         : "memory", "cc");
 179                 x = old;
 180                 break;
 181 #ifdef __s390x__
 182         case 8:
 183                 asm volatile(
 184                         "       lg      %0,0(%3)\n"
 185                         "0:     csg     %0,%2,0(%3)\n"
 186                         "       jl      0b\n"
 187                         : "=&d" (old), "=m" (*(long *) ptr)
 188                         : "d" (x), "a" (ptr), "m" (*(long *) ptr)
 189                         : "memory", "cc");
 190                 x = old;
 191                 break;
 192 #endif /* __s390x__ */
 193         }
 194         return x;
 195 }
 196
 197 /*
 198  * Atomic compare and exchange.  Compare OLD with MEM, if identical,
 199  * store NEW in MEM.  Return the initial value in MEM.  Success is
 200  * indicated by comparing RETURN with OLD.
 201  */
 202
 203 #define __HAVE_ARCH_CMPXCHG 1
 204
 205 #define cmpxchg(ptr,o,n)\
 206         ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
 207                                         (unsigned long)(n),sizeof(*(ptr))))
 208
 209 static inline unsigned long
 210 __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
 211 {
 212         unsigned long addr, prev, tmp;
 213         int shift;
 214
 215         switch (size) {
 216         case 1:
 217                 addr = (unsigned long) ptr;
 218                 shift = (3 ^ (addr & 3)) << 3;
 219                 addr ^= addr & 3;
 220                 asm volatile(
 221                         "       l       %0,0(%4)\n"
 222                         "0:     nr      %0,%5\n"
 223                         "       lr      %1,%0\n"
 224                         "       or      %0,%2\n"
 225                         "       or      %1,%3\n"
 226                         "       cs      %0,%1,0(%4)\n"
 227                         "       jnl     1f\n"
 228                         "       xr      %1,%0\n"
 229                         "       nr      %1,%5\n"
 230                         "       jnz     0b\n"
 231                         "1:"
 232                         : "=&d" (prev), "=&d" (tmp)
 233                         : "d" (old << shift), "d" (new << shift), "a" (ptr),
 234                           "d" (~(255 << shift))
 235                         : "memory", "cc");
 236                 return prev >> shift;
 237         case 2:
 238                 addr = (unsigned long) ptr;
 239                 shift = (2 ^ (addr & 2)) << 3;
 240                 addr ^= addr & 2;
 241                 asm volatile(
 242                         "       l       %0,0(%4)\n"
 243                         "0:     nr      %0,%5\n"
 244                         "       lr      %1,%0\n"
 245                         "       or      %0,%2\n"
 246                         "       or      %1,%3\n"
 247                         "       cs      %0,%1,0(%4)\n"
 248                         "       jnl     1f\n"
 249                         "       xr      %1,%0\n"
 250                         "       nr      %1,%5\n"
 251                         "       jnz     0b\n"
 252                         "1:"
 253                         : "=&d" (prev), "=&d" (tmp)
 254                         : "d" (old << shift), "d" (new << shift), "a" (ptr),
 255                           "d" (~(65535 << shift))
 256                         : "memory", "cc");
 257                 return prev >> shift;
 258         case 4:
 259                 asm volatile(
 260                         "       cs      %0,%2,0(%3)\n"
 261                         : "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
 262                         : "memory", "cc");
 263                 return prev;
 264 #ifdef __s390x__
 265         case 8:
 266                 asm volatile(
 267                         "       csg     %0,%2,0(%3)\n"
 268                         : "=&d" (prev) : "0" (old), "d" (new), "a" (ptr)
 269                         : "memory", "cc");
 270                 return prev;
 271 #endif /* __s390x__ */
 272         }
 273         return old;
 274 }
 275
 276 /*
 277  * Force strict CPU ordering.
 278  * And yes, this is required on UP too when we're talking
 279  * to devices.
 280  *
 281  * This is very similar to the ppc eieio/sync instruction in that is
 282  * does a checkpoint syncronisation & makes sure that
 283  * all memory ops have completed wrt other CPU's ( see 7-15 POP  DJB ).
 284  */
 285
 286 #define eieio() asm volatile("bcr 15,0" : : : "memory")
 287 #define SYNC_OTHER_CORES(x)   eieio()
 288 #define mb()    eieio()
 289 #define rmb()   eieio()
 290 #define wmb()   eieio()
 291 #define read_barrier_depends() do { } while(0)
 292 #define smp_mb()       mb()
 293 #define smp_rmb()      rmb()
 294 #define smp_wmb()      wmb()
 295 #define smp_read_barrier_depends()    read_barrier_depends()
 296 #define smp_mb__before_clear_bit()     smp_mb()
 297 #define smp_mb__after_clear_bit()      smp_mb()
 298
 299
 300 #define set_mb(var, value)      do { var = value; mb(); } while (0)
 301
 302 #ifdef __s390x__
 303
 304 #define __ctl_load(array, low, high) ({                         \
 305         typedef struct { char _[sizeof(array)]; } addrtype;     \
 306         asm volatile(                                           \
 307                 "       lctlg   %1,%2,0(%0)\n"                  \
 308                 : : "a" (&array), "i" (low), "i" (high),        \
 309                     "m" (*(addrtype *)(array)));                \
 310         })
 311
 312 #define __ctl_store(array, low, high) ({                        \
 313         typedef struct { char _[sizeof(array)]; } addrtype;     \
 314         asm volatile(                                           \
 315                 "       stctg   %2,%3,0(%1)\n"                  \
 316                 : "=m" (*(addrtype *)(array))                   \
 317                 : "a" (&array), "i" (low), "i" (high));         \
 318         })
 319
 320 #else /* __s390x__ */
 321
 322 #define __ctl_load(array, low, high) ({                         \
 323         typedef struct { char _[sizeof(array)]; } addrtype;     \
 324         asm volatile(                                           \
 325                 "       lctl    %1,%2,0(%0)\n"                  \
 326                 : : "a" (&array), "i" (low), "i" (high),        \
 327                     "m" (*(addrtype *)(array)));                \
 328 })
 329
 330 #define __ctl_store(array, low, high) ({                        \
 331         typedef struct { char _[sizeof(array)]; } addrtype;     \
 332         asm volatile(                                           \
 333                 "       stctl   %2,%3,0(%1)\n"                  \
 334                 : "=m" (*(addrtype *)(array))                   \
 335                 : "a" (&array), "i" (low), "i" (high));         \
 336         })
 337
 338 #endif /* __s390x__ */
 339
 340 #define __ctl_set_bit(cr, bit) ({       \
 341         unsigned long __dummy;          \
 342         __ctl_store(__dummy, cr, cr);   \
 343         __dummy |= 1UL << (bit);        \
 344         __ctl_load(__dummy, cr, cr);    \
 345 })
 346
 347 #define __ctl_clear_bit(cr, bit) ({     \
 348         unsigned long __dummy;          \
 349         __ctl_store(__dummy, cr, cr);   \
 350         __dummy &= ~(1UL << (bit));     \
 351         __ctl_load(__dummy, cr, cr);    \
 352 })
 353
 354 #include <linux/irqflags.h>
 355
 356 /*
 357  * Use to set psw mask except for the first byte which
 358  * won't be changed by this function.
 359  */
 360 static inline void
 361 __set_psw_mask(unsigned long mask)
 362 {
 363         __load_psw_mask(mask | (__raw_local_irq_stosm(0x00) & ~(-1UL >> 8)));
 364 }
 365
 366 #define local_mcck_enable()  __set_psw_mask(psw_kernel_bits)
 367 #define local_mcck_disable() __set_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK)
 368
 369 #ifdef CONFIG_SMP
 370
 371 extern void smp_ctl_set_bit(int cr, int bit);
 372 extern void smp_ctl_clear_bit(int cr, int bit);
 373 #define ctl_set_bit(cr, bit) smp_ctl_set_bit(cr, bit)
 374 #define ctl_clear_bit(cr, bit) smp_ctl_clear_bit(cr, bit)
 375
 376 #else
 377
 378 #define ctl_set_bit(cr, bit) __ctl_set_bit(cr, bit)
 379 #define ctl_clear_bit(cr, bit) __ctl_clear_bit(cr, bit)
 380
 381 #endif /* CONFIG_SMP */
 382
 383 extern void (*_machine_restart)(char *command);
 384 extern void (*_machine_halt)(void);
 385 extern void (*_machine_power_off)(void);
 386
 387 #define arch_align_stack(x) (x)
 388
 389 #endif /* __KERNEL__ */
 390
 391 #endif