git.oblomov.eu Git - linux-2.6/blob - include/asm-alpha/system.h

   1 #ifndef __ALPHA_SYSTEM_H
   2 #define __ALPHA_SYSTEM_H
   3
   4 #include <asm/pal.h>
   5 #include <asm/page.h>
   6 #include <asm/barrier.h>
   7
   8 /*
   9  * System defines.. Note that this is included both from .c and .S
  10  * files, so it does only defines, not any C code.
  11  */
  12
  13 /*
  14  * We leave one page for the initial stack page, and one page for
  15  * the initial process structure. Also, the console eats 3 MB for
  16  * the initial bootloader (one of which we can reclaim later).
  17  */
  18 #define BOOT_PCB        0x20000000
  19 #define BOOT_ADDR       0x20000000
  20 /* Remove when official MILO sources have ELF support: */
  21 #define BOOT_SIZE       (16*1024)
  22
  23 #ifdef CONFIG_ALPHA_LEGACY_START_ADDRESS
  24 #define KERNEL_START_PHYS       0x300000 /* Old bootloaders hardcoded this.  */
  25 #else
  26 #define KERNEL_START_PHYS       0x1000000 /* required: Wildfire/Titan/Marvel */
  27 #endif
  28
  29 #define KERNEL_START    (PAGE_OFFSET+KERNEL_START_PHYS)
  30 #define SWAPPER_PGD     KERNEL_START
  31 #define INIT_STACK      (PAGE_OFFSET+KERNEL_START_PHYS+0x02000)
  32 #define EMPTY_PGT       (PAGE_OFFSET+KERNEL_START_PHYS+0x04000)
  33 #define EMPTY_PGE       (PAGE_OFFSET+KERNEL_START_PHYS+0x08000)
  34 #define ZERO_PGE        (PAGE_OFFSET+KERNEL_START_PHYS+0x0A000)
  35
  36 #define START_ADDR      (PAGE_OFFSET+KERNEL_START_PHYS+0x10000)
  37
  38 /*
  39  * This is setup by the secondary bootstrap loader.  Because
  40  * the zero page is zeroed out as soon as the vm system is
  41  * initialized, we need to copy things out into a more permanent
  42  * place.
  43  */
  44 #define PARAM                   ZERO_PGE
  45 #define COMMAND_LINE            ((char*)(PARAM + 0x0000))
  46 #define INITRD_START            (*(unsigned long *) (PARAM+0x100))
  47 #define INITRD_SIZE             (*(unsigned long *) (PARAM+0x108))
  48
  49 #ifndef __ASSEMBLY__
  50 #include <linux/kernel.h>
  51
  52 /*
  53  * This is the logout header that should be common to all platforms
  54  * (assuming they are running OSF/1 PALcode, I guess).
  55  */
  56 struct el_common {
  57         unsigned int    size;           /* size in bytes of logout area */
  58         unsigned int    sbz1    : 30;   /* should be zero */
  59         unsigned int    err2    :  1;   /* second error */
  60         unsigned int    retry   :  1;   /* retry flag */
  61         unsigned int    proc_offset;    /* processor-specific offset */
  62         unsigned int    sys_offset;     /* system-specific offset */
  63         unsigned int    code;           /* machine check code */
  64         unsigned int    frame_rev;      /* frame revision */
  65 };
  66
  67 /* Machine Check Frame for uncorrectable errors (Large format)
  68  *      --- This is used to log uncorrectable errors such as
  69  *          double bit ECC errors.
  70  *      --- These errors are detected by both processor and systems.
  71  */
  72 struct el_common_EV5_uncorrectable_mcheck {
  73         unsigned long   shadow[8];        /* Shadow reg. 8-14, 25           */
  74         unsigned long   paltemp[24];      /* PAL TEMP REGS.                 */
  75         unsigned long   exc_addr;         /* Address of excepting instruction*/
  76         unsigned long   exc_sum;          /* Summary of arithmetic traps.   */
  77         unsigned long   exc_mask;         /* Exception mask (from exc_sum). */
  78         unsigned long   pal_base;         /* Base address for PALcode.      */
  79         unsigned long   isr;              /* Interrupt Status Reg.          */
  80         unsigned long   icsr;             /* CURRENT SETUP OF EV5 IBOX      */
  81         unsigned long   ic_perr_stat;     /* I-CACHE Reg. <11> set Data parity
  82                                                          <12> set TAG parity*/
  83         unsigned long   dc_perr_stat;     /* D-CACHE error Reg. Bits set to 1:
  84                                                      <2> Data error in bank 0
  85                                                      <3> Data error in bank 1
  86                                                      <4> Tag error in bank 0
  87                                                      <5> Tag error in bank 1 */
  88         unsigned long   va;               /* Effective VA of fault or miss. */
  89         unsigned long   mm_stat;          /* Holds the reason for D-stream
  90                                              fault or D-cache parity errors */
  91         unsigned long   sc_addr;          /* Address that was being accessed
  92                                              when EV5 detected Secondary cache
  93                                              failure.                 */
  94         unsigned long   sc_stat;          /* Helps determine if the error was
  95                                              TAG/Data parity(Secondary Cache)*/
  96         unsigned long   bc_tag_addr;      /* Contents of EV5 BC_TAG_ADDR    */
  97         unsigned long   ei_addr;          /* Physical address of any transfer
  98                                              that is logged in EV5 EI_STAT */
  99         unsigned long   fill_syndrome;    /* For correcting ECC errors.     */
 100         unsigned long   ei_stat;          /* Helps identify reason of any
 101                                              processor uncorrectable error
 102                                              at its external interface.     */
 103         unsigned long   ld_lock;          /* Contents of EV5 LD_LOCK register*/
 104 };
 105
 106 struct el_common_EV6_mcheck {
 107         unsigned int FrameSize;         /* Bytes, including this field */
 108         unsigned int FrameFlags;        /* <31> = Retry, <30> = Second Error */
 109         unsigned int CpuOffset;         /* Offset to CPU-specific info */
 110         unsigned int SystemOffset;      /* Offset to system-specific info */
 111         unsigned int MCHK_Code;
 112         unsigned int MCHK_Frame_Rev;
 113         unsigned long I_STAT;           /* EV6 Internal Processor Registers */
 114         unsigned long DC_STAT;          /* (See the 21264 Spec) */
 115         unsigned long C_ADDR;
 116         unsigned long DC1_SYNDROME;
 117         unsigned long DC0_SYNDROME;
 118         unsigned long C_STAT;
 119         unsigned long C_STS;
 120         unsigned long MM_STAT;
 121         unsigned long EXC_ADDR;
 122         unsigned long IER_CM;
 123         unsigned long ISUM;
 124         unsigned long RESERVED0;
 125         unsigned long PAL_BASE;
 126         unsigned long I_CTL;
 127         unsigned long PCTX;
 128 };
 129
 130 extern void halt(void) __attribute__((noreturn));
 131 #define __halt() __asm__ __volatile__ ("call_pal %0 #halt" : : "i" (PAL_halt))
 132
 133 #define switch_to(P,N,L)                                                 \
 134   do {                                                                   \
 135     (L) = alpha_switch_to(virt_to_phys(&task_thread_info(N)->pcb), (P)); \
 136     check_mmu_context();                                                 \
 137   } while (0)
 138
 139 struct task_struct;
 140 extern struct task_struct *alpha_switch_to(unsigned long, struct task_struct*);
 141
 142 #define imb() \
 143 __asm__ __volatile__ ("call_pal %0 #imb" : : "i" (PAL_imb) : "memory")
 144
 145 #define draina() \
 146 __asm__ __volatile__ ("call_pal %0 #draina" : : "i" (PAL_draina) : "memory")
 147
 148 enum implver_enum {
 149         IMPLVER_EV4,
 150         IMPLVER_EV5,
 151         IMPLVER_EV6
 152 };
 153
 154 #ifdef CONFIG_ALPHA_GENERIC
 155 #define implver()                               \
 156 ({ unsigned long __implver;                     \
 157    __asm__ ("implver %0" : "=r"(__implver));    \
 158    (enum implver_enum) __implver; })
 159 #else
 160 /* Try to eliminate some dead code.  */
 161 #ifdef CONFIG_ALPHA_EV4
 162 #define implver() IMPLVER_EV4
 163 #endif
 164 #ifdef CONFIG_ALPHA_EV5
 165 #define implver() IMPLVER_EV5
 166 #endif
 167 #if defined(CONFIG_ALPHA_EV6)
 168 #define implver() IMPLVER_EV6
 169 #endif
 170 #endif
 171
 172 enum amask_enum {
 173         AMASK_BWX = (1UL << 0),
 174         AMASK_FIX = (1UL << 1),
 175         AMASK_CIX = (1UL << 2),
 176         AMASK_MAX = (1UL << 8),
 177         AMASK_PRECISE_TRAP = (1UL << 9),
 178 };
 179
 180 #define amask(mask)                                             \
 181 ({ unsigned long __amask, __input = (mask);                     \
 182    __asm__ ("amask %1,%0" : "=r"(__amask) : "rI"(__input));     \
 183    __amask; })
 184
 185 #define __CALL_PAL_R0(NAME, TYPE)                               \
 186 static inline TYPE NAME(void)                                   \
 187 {                                                               \
 188         register TYPE __r0 __asm__("$0");                       \
 189         __asm__ __volatile__(                                   \
 190                 "call_pal %1 # " #NAME                          \
 191                 :"=r" (__r0)                                    \
 192                 :"i" (PAL_ ## NAME)                             \
 193                 :"$1", "$16", "$22", "$23", "$24", "$25");      \
 194         return __r0;                                            \
 195 }
 196
 197 #define __CALL_PAL_W1(NAME, TYPE0)                              \
 198 static inline void NAME(TYPE0 arg0)                             \
 199 {                                                               \
 200         register TYPE0 __r16 __asm__("$16") = arg0;             \
 201         __asm__ __volatile__(                                   \
 202                 "call_pal %1 # "#NAME                           \
 203                 : "=r"(__r16)                                   \
 204                 : "i"(PAL_ ## NAME), "0"(__r16)                 \
 205                 : "$1", "$22", "$23", "$24", "$25");            \
 206 }
 207
 208 #define __CALL_PAL_W2(NAME, TYPE0, TYPE1)                       \
 209 static inline void NAME(TYPE0 arg0, TYPE1 arg1)                 \
 210 {                                                               \
 211         register TYPE0 __r16 __asm__("$16") = arg0;             \
 212         register TYPE1 __r17 __asm__("$17") = arg1;             \
 213         __asm__ __volatile__(                                   \
 214                 "call_pal %2 # "#NAME                           \
 215                 : "=r"(__r16), "=r"(__r17)                      \
 216                 : "i"(PAL_ ## NAME), "0"(__r16), "1"(__r17)     \
 217                 : "$1", "$22", "$23", "$24", "$25");            \
 218 }
 219
 220 #define __CALL_PAL_RW1(NAME, RTYPE, TYPE0)                      \
 221 static inline RTYPE NAME(TYPE0 arg0)                            \
 222 {                                                               \
 223         register RTYPE __r0 __asm__("$0");                      \
 224         register TYPE0 __r16 __asm__("$16") = arg0;             \
 225         __asm__ __volatile__(                                   \
 226                 "call_pal %2 # "#NAME                           \
 227                 : "=r"(__r16), "=r"(__r0)                       \
 228                 : "i"(PAL_ ## NAME), "0"(__r16)                 \
 229                 : "$1", "$22", "$23", "$24", "$25");            \
 230         return __r0;                                            \
 231 }
 232
 233 #define __CALL_PAL_RW2(NAME, RTYPE, TYPE0, TYPE1)               \
 234 static inline RTYPE NAME(TYPE0 arg0, TYPE1 arg1)                \
 235 {                                                               \
 236         register RTYPE __r0 __asm__("$0");                      \
 237         register TYPE0 __r16 __asm__("$16") = arg0;             \
 238         register TYPE1 __r17 __asm__("$17") = arg1;             \
 239         __asm__ __volatile__(                                   \
 240                 "call_pal %3 # "#NAME                           \
 241                 : "=r"(__r16), "=r"(__r17), "=r"(__r0)          \
 242                 : "i"(PAL_ ## NAME), "0"(__r16), "1"(__r17)     \
 243                 : "$1", "$22", "$23", "$24", "$25");            \
 244         return __r0;                                            \
 245 }
 246
 247 __CALL_PAL_W1(cflush, unsigned long);
 248 __CALL_PAL_R0(rdmces, unsigned long);
 249 __CALL_PAL_R0(rdps, unsigned long);
 250 __CALL_PAL_R0(rdusp, unsigned long);
 251 __CALL_PAL_RW1(swpipl, unsigned long, unsigned long);
 252 __CALL_PAL_R0(whami, unsigned long);
 253 __CALL_PAL_W2(wrent, void*, unsigned long);
 254 __CALL_PAL_W1(wripir, unsigned long);
 255 __CALL_PAL_W1(wrkgp, unsigned long);
 256 __CALL_PAL_W1(wrmces, unsigned long);
 257 __CALL_PAL_RW2(wrperfmon, unsigned long, unsigned long, unsigned long);
 258 __CALL_PAL_W1(wrusp, unsigned long);
 259 __CALL_PAL_W1(wrvptptr, unsigned long);
 260
 261 #define IPL_MIN         0
 262 #define IPL_SW0         1
 263 #define IPL_SW1         2
 264 #define IPL_DEV0        3
 265 #define IPL_DEV1        4
 266 #define IPL_TIMER       5
 267 #define IPL_PERF        6
 268 #define IPL_POWERFAIL   6
 269 #define IPL_MCHECK      7
 270 #define IPL_MAX         7
 271
 272 #ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
 273 #undef IPL_MIN
 274 #define IPL_MIN         __min_ipl
 275 extern int __min_ipl;
 276 #endif
 277
 278 #define getipl()                (rdps() & 7)
 279 #define setipl(ipl)             ((void) swpipl(ipl))
 280
 281 #define local_irq_disable()                     do { setipl(IPL_MAX); barrier(); } while(0)
 282 #define local_irq_enable()                      do { barrier(); setipl(IPL_MIN); } while(0)
 283 #define local_save_flags(flags) ((flags) = rdps())
 284 #define local_irq_save(flags)   do { (flags) = swpipl(IPL_MAX); barrier(); } while(0)
 285 #define local_irq_restore(flags)        do { barrier(); setipl(flags); barrier(); } while(0)
 286
 287 #define irqs_disabled() (getipl() == IPL_MAX)
 288
 289 /*
 290  * TB routines..
 291  */
 292 #define __tbi(nr,arg,arg1...)                                   \
 293 ({                                                              \
 294         register unsigned long __r16 __asm__("$16") = (nr);     \
 295         register unsigned long __r17 __asm__("$17"); arg;       \
 296         __asm__ __volatile__(                                   \
 297                 "call_pal %3 #__tbi"                            \
 298                 :"=r" (__r16),"=r" (__r17)                      \
 299                 :"0" (__r16),"i" (PAL_tbi) ,##arg1              \
 300                 :"$0", "$1", "$22", "$23", "$24", "$25");       \
 301 })
 302
 303 #define tbi(x,y)        __tbi(x,__r17=(y),"1" (__r17))
 304 #define tbisi(x)        __tbi(1,__r17=(x),"1" (__r17))
 305 #define tbisd(x)        __tbi(2,__r17=(x),"1" (__r17))
 306 #define tbis(x)         __tbi(3,__r17=(x),"1" (__r17))
 307 #define tbiap()         __tbi(-1, /* no second argument */)
 308 #define tbia()          __tbi(-2, /* no second argument */)
 309
 310 /*
 311  * Atomic exchange.
 312  * Since it can be used to implement critical sections
 313  * it must clobber "memory" (also for interrupts in UP).
 314  */
 315
 316 static inline unsigned long
 317 __xchg_u8(volatile char *m, unsigned long val)
 318 {
 319         unsigned long ret, tmp, addr64;
 320
 321         __asm__ __volatile__(
 322         "       andnot  %4,7,%3\n"
 323         "       insbl   %1,%4,%1\n"
 324         "1:     ldq_l   %2,0(%3)\n"
 325         "       extbl   %2,%4,%0\n"
 326         "       mskbl   %2,%4,%2\n"
 327         "       or      %1,%2,%2\n"
 328         "       stq_c   %2,0(%3)\n"
 329         "       beq     %2,2f\n"
 330 #ifdef CONFIG_SMP
 331         "       mb\n"
 332 #endif
 333         ".subsection 2\n"
 334         "2:     br      1b\n"
 335         ".previous"
 336         : "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
 337         : "r" ((long)m), "1" (val) : "memory");
 338
 339         return ret;
 340 }
 341
 342 static inline unsigned long
 343 __xchg_u16(volatile short *m, unsigned long val)
 344 {
 345         unsigned long ret, tmp, addr64;
 346
 347         __asm__ __volatile__(
 348         "       andnot  %4,7,%3\n"
 349         "       inswl   %1,%4,%1\n"
 350         "1:     ldq_l   %2,0(%3)\n"
 351         "       extwl   %2,%4,%0\n"
 352         "       mskwl   %2,%4,%2\n"
 353         "       or      %1,%2,%2\n"
 354         "       stq_c   %2,0(%3)\n"
 355         "       beq     %2,2f\n"
 356 #ifdef CONFIG_SMP
 357         "       mb\n"
 358 #endif
 359         ".subsection 2\n"
 360         "2:     br      1b\n"
 361         ".previous"
 362         : "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
 363         : "r" ((long)m), "1" (val) : "memory");
 364
 365         return ret;
 366 }
 367
 368 static inline unsigned long
 369 __xchg_u32(volatile int *m, unsigned long val)
 370 {
 371         unsigned long dummy;
 372
 373         __asm__ __volatile__(
 374         "1:     ldl_l %0,%4\n"
 375         "       bis $31,%3,%1\n"
 376         "       stl_c %1,%2\n"
 377         "       beq %1,2f\n"
 378 #ifdef CONFIG_SMP
 379         "       mb\n"
 380 #endif
 381         ".subsection 2\n"
 382         "2:     br 1b\n"
 383         ".previous"
 384         : "=&r" (val), "=&r" (dummy), "=m" (*m)
 385         : "rI" (val), "m" (*m) : "memory");
 386
 387         return val;
 388 }
 389
 390 static inline unsigned long
 391 __xchg_u64(volatile long *m, unsigned long val)
 392 {
 393         unsigned long dummy;
 394
 395         __asm__ __volatile__(
 396         "1:     ldq_l %0,%4\n"
 397         "       bis $31,%3,%1\n"
 398         "       stq_c %1,%2\n"
 399         "       beq %1,2f\n"
 400 #ifdef CONFIG_SMP
 401         "       mb\n"
 402 #endif
 403         ".subsection 2\n"
 404         "2:     br 1b\n"
 405         ".previous"
 406         : "=&r" (val), "=&r" (dummy), "=m" (*m)
 407         : "rI" (val), "m" (*m) : "memory");
 408
 409         return val;
 410 }
 411
 412 /* This function doesn't exist, so you'll get a linker error
 413    if something tries to do an invalid xchg().  */
 414 extern void __xchg_called_with_bad_pointer(void);
 415
 416 #define __xchg(ptr, x, size) \
 417 ({ \
 418         unsigned long __xchg__res; \
 419         volatile void *__xchg__ptr = (ptr); \
 420         switch (size) { \
 421                 case 1: __xchg__res = __xchg_u8(__xchg__ptr, x); break; \
 422                 case 2: __xchg__res = __xchg_u16(__xchg__ptr, x); break; \
 423                 case 4: __xchg__res = __xchg_u32(__xchg__ptr, x); break; \
 424                 case 8: __xchg__res = __xchg_u64(__xchg__ptr, x); break; \
 425                 default: __xchg_called_with_bad_pointer(); __xchg__res = x; \
 426         } \
 427         __xchg__res; \
 428 })
 429
 430 #define xchg(ptr,x)                                                          \
 431   ({                                                                         \
 432      __typeof__(*(ptr)) _x_ = (x);                                           \
 433      (__typeof__(*(ptr))) __xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
 434   })
 435
 436 static inline unsigned long
 437 __xchg_u8_local(volatile char *m, unsigned long val)
 438 {
 439         unsigned long ret, tmp, addr64;
 440
 441         __asm__ __volatile__(
 442         "       andnot  %4,7,%3\n"
 443         "       insbl   %1,%4,%1\n"
 444         "1:     ldq_l   %2,0(%3)\n"
 445         "       extbl   %2,%4,%0\n"
 446         "       mskbl   %2,%4,%2\n"
 447         "       or      %1,%2,%2\n"
 448         "       stq_c   %2,0(%3)\n"
 449         "       beq     %2,2f\n"
 450         ".subsection 2\n"
 451         "2:     br      1b\n"
 452         ".previous"
 453         : "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
 454         : "r" ((long)m), "1" (val) : "memory");
 455
 456         return ret;
 457 }
 458
 459 static inline unsigned long
 460 __xchg_u16_local(volatile short *m, unsigned long val)
 461 {
 462         unsigned long ret, tmp, addr64;
 463
 464         __asm__ __volatile__(
 465         "       andnot  %4,7,%3\n"
 466         "       inswl   %1,%4,%1\n"
 467         "1:     ldq_l   %2,0(%3)\n"
 468         "       extwl   %2,%4,%0\n"
 469         "       mskwl   %2,%4,%2\n"
 470         "       or      %1,%2,%2\n"
 471         "       stq_c   %2,0(%3)\n"
 472         "       beq     %2,2f\n"
 473         ".subsection 2\n"
 474         "2:     br      1b\n"
 475         ".previous"
 476         : "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
 477         : "r" ((long)m), "1" (val) : "memory");
 478
 479         return ret;
 480 }
 481
 482 static inline unsigned long
 483 __xchg_u32_local(volatile int *m, unsigned long val)
 484 {
 485         unsigned long dummy;
 486
 487         __asm__ __volatile__(
 488         "1:     ldl_l %0,%4\n"
 489         "       bis $31,%3,%1\n"
 490         "       stl_c %1,%2\n"
 491         "       beq %1,2f\n"
 492         ".subsection 2\n"
 493         "2:     br 1b\n"
 494         ".previous"
 495         : "=&r" (val), "=&r" (dummy), "=m" (*m)
 496         : "rI" (val), "m" (*m) : "memory");
 497
 498         return val;
 499 }
 500
 501 static inline unsigned long
 502 __xchg_u64_local(volatile long *m, unsigned long val)
 503 {
 504         unsigned long dummy;
 505
 506         __asm__ __volatile__(
 507         "1:     ldq_l %0,%4\n"
 508         "       bis $31,%3,%1\n"
 509         "       stq_c %1,%2\n"
 510         "       beq %1,2f\n"
 511         ".subsection 2\n"
 512         "2:     br 1b\n"
 513         ".previous"
 514         : "=&r" (val), "=&r" (dummy), "=m" (*m)
 515         : "rI" (val), "m" (*m) : "memory");
 516
 517         return val;
 518 }
 519
 520 #define __xchg_local(ptr, x, size) \
 521 ({ \
 522         unsigned long __xchg__res; \
 523         volatile void *__xchg__ptr = (ptr); \
 524         switch (size) { \
 525                 case 1: __xchg__res = __xchg_u8_local(__xchg__ptr, x); break; \
 526                 case 2: __xchg__res = __xchg_u16_local(__xchg__ptr, x); break; \
 527                 case 4: __xchg__res = __xchg_u32_local(__xchg__ptr, x); break; \
 528                 case 8: __xchg__res = __xchg_u64_local(__xchg__ptr, x); break; \
 529                 default: __xchg_called_with_bad_pointer(); __xchg__res = x; \
 530         } \
 531         __xchg__res; \
 532 })
 533
 534 #define xchg_local(ptr,x)                                                    \
 535   ({                                                                         \
 536      __typeof__(*(ptr)) _x_ = (x);                                           \
 537      (__typeof__(*(ptr))) __xchg_local((ptr), (unsigned long)_x_,            \
 538                 sizeof(*(ptr))); \
 539   })
 540
 541 /*
 542  * Atomic compare and exchange.  Compare OLD with MEM, if identical,
 543  * store NEW in MEM.  Return the initial value in MEM.  Success is
 544  * indicated by comparing RETURN with OLD.
 545  *
 546  * The memory barrier should be placed in SMP only when we actually
 547  * make the change. If we don't change anything (so if the returned
 548  * prev is equal to old) then we aren't acquiring anything new and
 549  * we don't need any memory barrier as far I can tell.
 550  */
 551
 552 #define __HAVE_ARCH_CMPXCHG 1
 553
 554 static inline unsigned long
 555 __cmpxchg_u8(volatile char *m, long old, long new)
 556 {
 557         unsigned long prev, tmp, cmp, addr64;
 558
 559         __asm__ __volatile__(
 560         "       andnot  %5,7,%4\n"
 561         "       insbl   %1,%5,%1\n"
 562         "1:     ldq_l   %2,0(%4)\n"
 563         "       extbl   %2,%5,%0\n"
 564         "       cmpeq   %0,%6,%3\n"
 565         "       beq     %3,2f\n"
 566         "       mskbl   %2,%5,%2\n"
 567         "       or      %1,%2,%2\n"
 568         "       stq_c   %2,0(%4)\n"
 569         "       beq     %2,3f\n"
 570 #ifdef CONFIG_SMP
 571         "       mb\n"
 572 #endif
 573         "2:\n"
 574         ".subsection 2\n"
 575         "3:     br      1b\n"
 576         ".previous"
 577         : "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
 578         : "r" ((long)m), "Ir" (old), "1" (new) : "memory");
 579
 580         return prev;
 581 }
 582
 583 static inline unsigned long
 584 __cmpxchg_u16(volatile short *m, long old, long new)
 585 {
 586         unsigned long prev, tmp, cmp, addr64;
 587
 588         __asm__ __volatile__(
 589         "       andnot  %5,7,%4\n"
 590         "       inswl   %1,%5,%1\n"
 591         "1:     ldq_l   %2,0(%4)\n"
 592         "       extwl   %2,%5,%0\n"
 593         "       cmpeq   %0,%6,%3\n"
 594         "       beq     %3,2f\n"
 595         "       mskwl   %2,%5,%2\n"
 596         "       or      %1,%2,%2\n"
 597         "       stq_c   %2,0(%4)\n"
 598         "       beq     %2,3f\n"
 599 #ifdef CONFIG_SMP
 600         "       mb\n"
 601 #endif
 602         "2:\n"
 603         ".subsection 2\n"
 604         "3:     br      1b\n"
 605         ".previous"
 606         : "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
 607         : "r" ((long)m), "Ir" (old), "1" (new) : "memory");
 608
 609         return prev;
 610 }
 611
 612 static inline unsigned long
 613 __cmpxchg_u32(volatile int *m, int old, int new)
 614 {
 615         unsigned long prev, cmp;
 616
 617         __asm__ __volatile__(
 618         "1:     ldl_l %0,%5\n"
 619         "       cmpeq %0,%3,%1\n"
 620         "       beq %1,2f\n"
 621         "       mov %4,%1\n"
 622         "       stl_c %1,%2\n"
 623         "       beq %1,3f\n"
 624 #ifdef CONFIG_SMP
 625         "       mb\n"
 626 #endif
 627         "2:\n"
 628         ".subsection 2\n"
 629         "3:     br 1b\n"
 630         ".previous"
 631         : "=&r"(prev), "=&r"(cmp), "=m"(*m)
 632         : "r"((long) old), "r"(new), "m"(*m) : "memory");
 633
 634         return prev;
 635 }
 636
 637 static inline unsigned long
 638 __cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new)
 639 {
 640         unsigned long prev, cmp;
 641
 642         __asm__ __volatile__(
 643         "1:     ldq_l %0,%5\n"
 644         "       cmpeq %0,%3,%1\n"
 645         "       beq %1,2f\n"
 646         "       mov %4,%1\n"
 647         "       stq_c %1,%2\n"
 648         "       beq %1,3f\n"
 649 #ifdef CONFIG_SMP
 650         "       mb\n"
 651 #endif
 652         "2:\n"
 653         ".subsection 2\n"
 654         "3:     br 1b\n"
 655         ".previous"
 656         : "=&r"(prev), "=&r"(cmp), "=m"(*m)
 657         : "r"((long) old), "r"(new), "m"(*m) : "memory");
 658
 659         return prev;
 660 }
 661
 662 /* This function doesn't exist, so you'll get a linker error
 663    if something tries to do an invalid cmpxchg().  */
 664 extern void __cmpxchg_called_with_bad_pointer(void);
 665
 666 static __always_inline unsigned long
 667 __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
 668 {
 669         switch (size) {
 670                 case 1:
 671                         return __cmpxchg_u8(ptr, old, new);
 672                 case 2:
 673                         return __cmpxchg_u16(ptr, old, new);
 674                 case 4:
 675                         return __cmpxchg_u32(ptr, old, new);
 676                 case 8:
 677                         return __cmpxchg_u64(ptr, old, new);
 678         }
 679         __cmpxchg_called_with_bad_pointer();
 680         return old;
 681 }
 682
 683 #define cmpxchg(ptr,o,n)                                                 \
 684   ({                                                                     \
 685      __typeof__(*(ptr)) _o_ = (o);                                       \
 686      __typeof__(*(ptr)) _n_ = (n);                                       \
 687      (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,           \
 688                                     (unsigned long)_n_, sizeof(*(ptr))); \
 689   })
 690
 691 static inline unsigned long
 692 __cmpxchg_u8_local(volatile char *m, long old, long new)
 693 {
 694         unsigned long prev, tmp, cmp, addr64;
 695
 696         __asm__ __volatile__(
 697         "       andnot  %5,7,%4\n"
 698         "       insbl   %1,%5,%1\n"
 699         "1:     ldq_l   %2,0(%4)\n"
 700         "       extbl   %2,%5,%0\n"
 701         "       cmpeq   %0,%6,%3\n"
 702         "       beq     %3,2f\n"
 703         "       mskbl   %2,%5,%2\n"
 704         "       or      %1,%2,%2\n"
 705         "       stq_c   %2,0(%4)\n"
 706         "       beq     %2,3f\n"
 707         "2:\n"
 708         ".subsection 2\n"
 709         "3:     br      1b\n"
 710         ".previous"
 711         : "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
 712         : "r" ((long)m), "Ir" (old), "1" (new) : "memory");
 713
 714         return prev;
 715 }
 716
 717 static inline unsigned long
 718 __cmpxchg_u16_local(volatile short *m, long old, long new)
 719 {
 720         unsigned long prev, tmp, cmp, addr64;
 721
 722         __asm__ __volatile__(
 723         "       andnot  %5,7,%4\n"
 724         "       inswl   %1,%5,%1\n"
 725         "1:     ldq_l   %2,0(%4)\n"
 726         "       extwl   %2,%5,%0\n"
 727         "       cmpeq   %0,%6,%3\n"
 728         "       beq     %3,2f\n"
 729         "       mskwl   %2,%5,%2\n"
 730         "       or      %1,%2,%2\n"
 731         "       stq_c   %2,0(%4)\n"
 732         "       beq     %2,3f\n"
 733         "2:\n"
 734         ".subsection 2\n"
 735         "3:     br      1b\n"
 736         ".previous"
 737         : "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
 738         : "r" ((long)m), "Ir" (old), "1" (new) : "memory");
 739
 740         return prev;
 741 }
 742
 743 static inline unsigned long
 744 __cmpxchg_u32_local(volatile int *m, int old, int new)
 745 {
 746         unsigned long prev, cmp;
 747
 748         __asm__ __volatile__(
 749         "1:     ldl_l %0,%5\n"
 750         "       cmpeq %0,%3,%1\n"
 751         "       beq %1,2f\n"
 752         "       mov %4,%1\n"
 753         "       stl_c %1,%2\n"
 754         "       beq %1,3f\n"
 755         "2:\n"
 756         ".subsection 2\n"
 757         "3:     br 1b\n"
 758         ".previous"
 759         : "=&r"(prev), "=&r"(cmp), "=m"(*m)
 760         : "r"((long) old), "r"(new), "m"(*m) : "memory");
 761
 762         return prev;
 763 }
 764
 765 static inline unsigned long
 766 __cmpxchg_u64_local(volatile long *m, unsigned long old, unsigned long new)
 767 {
 768         unsigned long prev, cmp;
 769
 770         __asm__ __volatile__(
 771         "1:     ldq_l %0,%5\n"
 772         "       cmpeq %0,%3,%1\n"
 773         "       beq %1,2f\n"
 774         "       mov %4,%1\n"
 775         "       stq_c %1,%2\n"
 776         "       beq %1,3f\n"
 777         "2:\n"
 778         ".subsection 2\n"
 779         "3:     br 1b\n"
 780         ".previous"
 781         : "=&r"(prev), "=&r"(cmp), "=m"(*m)
 782         : "r"((long) old), "r"(new), "m"(*m) : "memory");
 783
 784         return prev;
 785 }
 786
 787 static __always_inline unsigned long
 788 __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new,
 789                 int size)
 790 {
 791         switch (size) {
 792                 case 1:
 793                         return __cmpxchg_u8_local(ptr, old, new);
 794                 case 2:
 795                         return __cmpxchg_u16_local(ptr, old, new);
 796                 case 4:
 797                         return __cmpxchg_u32_local(ptr, old, new);
 798                 case 8:
 799                         return __cmpxchg_u64_local(ptr, old, new);
 800         }
 801         __cmpxchg_called_with_bad_pointer();
 802         return old;
 803 }
 804
 805 #define cmpxchg_local(ptr,o,n)                                           \
 806   ({                                                                     \
 807      __typeof__(*(ptr)) _o_ = (o);                                       \
 808      __typeof__(*(ptr)) _n_ = (n);                                       \
 809      (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_,     \
 810                                     (unsigned long)_n_, sizeof(*(ptr))); \
 811   })
 812
 813 #endif /* __ASSEMBLY__ */
 814
 815 #define arch_align_stack(x) (x)
 816
 817 #endif