arch/ia64/include/asm/processor.h

   1 #ifndef _ASM_IA64_PROCESSOR_H
   2 #define _ASM_IA64_PROCESSOR_H
   3
   4 /*
   5  * Copyright (C) 1998-2004 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  *      Stephane Eranian <eranian@hpl.hp.com>
   8  * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
   9  * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
  10  *
  11  * 11/24/98     S.Eranian       added ia64_set_iva()
  12  * 12/03/99     D. Mosberger    implement thread_saved_pc() via kernel unwind API
  13  * 06/16/00     A. Mallick      added csd/ssd/tssd for ia32 support
  14  */
  15
  16
  17 #include <asm/intrinsics.h>
  18 #include <asm/kregs.h>
  19 #include <asm/ptrace.h>
  20 #include <asm/ustack.h>
  21
  22 #define __ARCH_WANT_UNLOCKED_CTXSW
  23 #define ARCH_HAS_PREFETCH_SWITCH_STACK
  24
  25 #define IA64_NUM_PHYS_STACK_REG 96
  26 #define IA64_NUM_DBG_REGS       8
  27
  28 #define DEFAULT_MAP_BASE        __IA64_UL_CONST(0x2000000000000000)
  29 #define DEFAULT_TASK_SIZE       __IA64_UL_CONST(0xa000000000000000)
  30
  31 /*
  32  * TASK_SIZE really is a mis-named.  It really is the maximum user
  33  * space address (plus one).  On IA-64, there are five regions of 2TB
  34  * each (assuming 8KB page size), for a total of 8TB of user virtual
  35  * address space.
  36  */
  37 #define TASK_SIZE               DEFAULT_TASK_SIZE
  38
  39 /*
  40  * This decides where the kernel will search for a free chunk of vm
  41  * space during mmap's.
  42  */
  43 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
  44
  45 #define IA64_THREAD_FPH_VALID   (__IA64_UL(1) << 0)     /* floating-point high state valid? */
  46 #define IA64_THREAD_DBG_VALID   (__IA64_UL(1) << 1)     /* debug registers valid? */
  47 #define IA64_THREAD_PM_VALID    (__IA64_UL(1) << 2)     /* performance registers valid? */
  48 #define IA64_THREAD_UAC_NOPRINT (__IA64_UL(1) << 3)     /* don't log unaligned accesses */
  49 #define IA64_THREAD_UAC_SIGBUS  (__IA64_UL(1) << 4)     /* generate SIGBUS on unaligned acc. */
  50 #define IA64_THREAD_MIGRATION   (__IA64_UL(1) << 5)     /* require migration
  51                                                            sync at ctx sw */
  52 #define IA64_THREAD_FPEMU_NOPRINT (__IA64_UL(1) << 6)   /* don't log any fpswa faults */
  53 #define IA64_THREAD_FPEMU_SIGFPE  (__IA64_UL(1) << 7)   /* send a SIGFPE for fpswa faults */
  54
  55 #define IA64_THREAD_UAC_SHIFT   3
  56 #define IA64_THREAD_UAC_MASK    (IA64_THREAD_UAC_NOPRINT | IA64_THREAD_UAC_SIGBUS)
  57 #define IA64_THREAD_FPEMU_SHIFT 6
  58 #define IA64_THREAD_FPEMU_MASK  (IA64_THREAD_FPEMU_NOPRINT | IA64_THREAD_FPEMU_SIGFPE)
  59
  60
  61 /*
  62  * This shift should be large enough to be able to represent 1000000000/itc_freq with good
  63  * accuracy while being small enough to fit 10*1000000000<<IA64_NSEC_PER_CYC_SHIFT in 64 bits
  64  * (this will give enough slack to represent 10 seconds worth of time as a scaled number).
  65  */
  66 #define IA64_NSEC_PER_CYC_SHIFT 30
  67
  68 #ifndef __ASSEMBLY__
  69
  70 #include <linux/cache.h>
  71 #include <linux/compiler.h>
  72 #include <linux/threads.h>
  73 #include <linux/types.h>
  74
  75 #include <asm/fpu.h>
  76 #include <asm/page.h>
  77 #include <asm/percpu.h>
  78 #include <asm/rse.h>
  79 #include <asm/unwind.h>
  80 #include <linux/atomic.h>
  81 #ifdef CONFIG_NUMA
  82 #include <asm/nodedata.h>
  83 #endif
  84
  85 /* like above but expressed as bitfields for more efficient access: */
  86 struct ia64_psr {
  87         __u64 reserved0 : 1;
  88         __u64 be : 1;
  89         __u64 up : 1;
  90         __u64 ac : 1;
  91         __u64 mfl : 1;
  92         __u64 mfh : 1;
  93         __u64 reserved1 : 7;
  94         __u64 ic : 1;
  95         __u64 i : 1;
  96         __u64 pk : 1;
  97         __u64 reserved2 : 1;
  98         __u64 dt : 1;
  99         __u64 dfl : 1;
 100         __u64 dfh : 1;
 101         __u64 sp : 1;
 102         __u64 pp : 1;
 103         __u64 di : 1;
 104         __u64 si : 1;
 105         __u64 db : 1;
 106         __u64 lp : 1;
 107         __u64 tb : 1;
 108         __u64 rt : 1;
 109         __u64 reserved3 : 4;
 110         __u64 cpl : 2;
 111         __u64 is : 1;
 112         __u64 mc : 1;
 113         __u64 it : 1;
 114         __u64 id : 1;
 115         __u64 da : 1;
 116         __u64 dd : 1;
 117         __u64 ss : 1;
 118         __u64 ri : 2;
 119         __u64 ed : 1;
 120         __u64 bn : 1;
 121         __u64 reserved4 : 19;
 122 };
 123
 124 union ia64_isr {
 125         __u64  val;
 126         struct {
 127                 __u64 code : 16;
 128                 __u64 vector : 8;
 129                 __u64 reserved1 : 8;
 130                 __u64 x : 1;
 131                 __u64 w : 1;
 132                 __u64 r : 1;
 133                 __u64 na : 1;
 134                 __u64 sp : 1;
 135                 __u64 rs : 1;
 136                 __u64 ir : 1;
 137                 __u64 ni : 1;
 138                 __u64 so : 1;
 139                 __u64 ei : 2;
 140                 __u64 ed : 1;
 141                 __u64 reserved2 : 20;
 142         };
 143 };
 144
 145 union ia64_lid {
 146         __u64 val;
 147         struct {
 148                 __u64  rv  : 16;
 149                 __u64  eid : 8;
 150                 __u64  id  : 8;
 151                 __u64  ig  : 32;
 152         };
 153 };
 154
 155 union ia64_tpr {
 156         __u64 val;
 157         struct {
 158                 __u64 ig0 : 4;
 159                 __u64 mic : 4;
 160                 __u64 rsv : 8;
 161                 __u64 mmi : 1;
 162                 __u64 ig1 : 47;
 163         };
 164 };
 165
 166 union ia64_itir {
 167         __u64 val;
 168         struct {
 169                 __u64 rv3  :  2; /* 0-1 */
 170                 __u64 ps   :  6; /* 2-7 */
 171                 __u64 key  : 24; /* 8-31 */
 172                 __u64 rv4  : 32; /* 32-63 */
 173         };
 174 };
 175
 176 union  ia64_rr {
 177         __u64 val;
 178         struct {
 179                 __u64  ve       :  1;  /* enable hw walker */
 180                 __u64  reserved0:  1;  /* reserved */
 181                 __u64  ps       :  6;  /* log page size */
 182                 __u64  rid      : 24;  /* region id */
 183                 __u64  reserved1: 32;  /* reserved */
 184         };
 185 };
 186
 187 /*
 188  * CPU type, hardware bug flags, and per-CPU state.  Frequently used
 189  * state comes earlier:
 190  */
 191 struct cpuinfo_ia64 {
 192         unsigned int softirq_pending;
 193         unsigned long itm_delta;        /* # of clock cycles between clock ticks */
 194         unsigned long itm_next;         /* interval timer mask value to use for next clock tick */
 195         unsigned long nsec_per_cyc;     /* (1000000000<<IA64_NSEC_PER_CYC_SHIFT)/itc_freq */
 196         unsigned long unimpl_va_mask;   /* mask of unimplemented virtual address bits (from PAL) */
 197         unsigned long unimpl_pa_mask;   /* mask of unimplemented physical address bits (from PAL) */
 198         unsigned long itc_freq;         /* frequency of ITC counter */
 199         unsigned long proc_freq;        /* frequency of processor */
 200         unsigned long cyc_per_usec;     /* itc_freq/1000000 */
 201         unsigned long ptce_base;
 202         unsigned int ptce_count[2];
 203         unsigned int ptce_stride[2];
 204         struct task_struct *ksoftirqd;  /* kernel softirq daemon for this CPU */
 205
 206 #ifdef CONFIG_SMP
 207         unsigned long loops_per_jiffy;
 208         int cpu;
 209         unsigned int socket_id; /* physical processor socket id */
 210         unsigned short core_id; /* core id */
 211         unsigned short thread_id; /* thread id */
 212         unsigned short num_log; /* Total number of logical processors on
 213                                  * this socket that were successfully booted */
 214         unsigned char cores_per_socket; /* Cores per processor socket */
 215         unsigned char threads_per_core; /* Threads per core */
 216 #endif
 217
 218         /* CPUID-derived information: */
 219         unsigned long ppn;
 220         unsigned long features;
 221         unsigned char number;
 222         unsigned char revision;
 223         unsigned char model;
 224         unsigned char family;
 225         unsigned char archrev;
 226         char vendor[16];
 227         char *model_name;
 228
 229 #ifdef CONFIG_NUMA
 230         struct ia64_node_data *node_data;
 231 #endif
 232 };
 233
 234 DECLARE_PER_CPU(struct cpuinfo_ia64, ia64_cpu_info);
 235
 236 /*
 237  * The "local" data variable.  It refers to the per-CPU data of the currently executing
 238  * CPU, much like "current" points to the per-task data of the currently executing task.
 239  * Do not use the address of local_cpu_data, since it will be different from
 240  * cpu_data(smp_processor_id())!
 241  */
 242 #define local_cpu_data          (&__ia64_per_cpu_var(ia64_cpu_info))
 243 #define cpu_data(cpu)           (&per_cpu(ia64_cpu_info, cpu))
 244
 245 extern void print_cpu_info (struct cpuinfo_ia64 *);
 246
 247 typedef struct {
 248         unsigned long seg;
 249 } mm_segment_t;
 250
 251 #define SET_UNALIGN_CTL(task,value)                                                             \
 252 ({                                                                                              \
 253         (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_UAC_MASK)                  \
 254                                 | (((value) << IA64_THREAD_UAC_SHIFT) & IA64_THREAD_UAC_MASK)); \
 255         0;                                                                                      \
 256 })
 257 #define GET_UNALIGN_CTL(task,addr)                                                              \
 258 ({                                                                                              \
 259         put_user(((task)->thread.flags & IA64_THREAD_UAC_MASK) >> IA64_THREAD_UAC_SHIFT,        \
 260                  (int __user *) (addr));                                                        \
 261 })
 262
 263 #define SET_FPEMU_CTL(task,value)                                                               \
 264 ({                                                                                              \
 265         (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_FPEMU_MASK)                \
 266                           | (((value) << IA64_THREAD_FPEMU_SHIFT) & IA64_THREAD_FPEMU_MASK));   \
 267         0;                                                                                      \
 268 })
 269 #define GET_FPEMU_CTL(task,addr)                                                                \
 270 ({                                                                                              \
 271         put_user(((task)->thread.flags & IA64_THREAD_FPEMU_MASK) >> IA64_THREAD_FPEMU_SHIFT,    \
 272                  (int __user *) (addr));                                                        \
 273 })
 274
 275 struct thread_struct {
 276         __u32 flags;                    /* various thread flags (see IA64_THREAD_*) */
 277         /* writing on_ustack is performance-critical, so it's worth spending 8 bits on it... */
 278         __u8 on_ustack;                 /* executing on user-stacks? */
 279         __u8 pad[3];
 280         __u64 ksp;                      /* kernel stack pointer */
 281         __u64 map_base;                 /* base address for get_unmapped_area() */
 282         __u64 rbs_bot;                  /* the base address for the RBS */
 283         int last_fph_cpu;               /* CPU that may hold the contents of f32-f127 */
 284
 285 #ifdef CONFIG_PERFMON
 286         void *pfm_context;                   /* pointer to detailed PMU context */
 287         unsigned long pfm_needs_checking;    /* when >0, pending perfmon work on kernel exit */
 288 # define INIT_THREAD_PM         .pfm_context =          NULL,     \
 289                                 .pfm_needs_checking =   0UL,
 290 #else
 291 # define INIT_THREAD_PM
 292 #endif
 293         unsigned long dbr[IA64_NUM_DBG_REGS];
 294         unsigned long ibr[IA64_NUM_DBG_REGS];
 295         struct ia64_fpreg fph[96];      /* saved/loaded on demand */
 296 };
 297
 298 #define INIT_THREAD {                                           \
 299         .flags =        0,                                      \
 300         .on_ustack =    0,                                      \
 301         .ksp =          0,                                      \
 302         .map_base =     DEFAULT_MAP_BASE,                       \
 303         .rbs_bot =      STACK_TOP - DEFAULT_USER_STACK_SIZE,    \
 304         .last_fph_cpu =  -1,                                    \
 305         INIT_THREAD_PM                                          \
 306         .dbr =          {0, },                                  \
 307         .ibr =          {0, },                                  \
 308         .fph =          {{{{0}}}, }                             \
 309 }
 310
 311 #define start_thread(regs,new_ip,new_sp) do {                                                   \
 312         regs->cr_ipsr = ((regs->cr_ipsr | (IA64_PSR_BITS_TO_SET | IA64_PSR_CPL))                \
 313                          & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_RI | IA64_PSR_IS));              \
 314         regs->cr_iip = new_ip;                                                                  \
 315         regs->ar_rsc = 0xf;             /* eager mode, privilege level 3 */                     \
 316         regs->ar_rnat = 0;                                                                      \
 317         regs->ar_bspstore = current->thread.rbs_bot;                                            \
 318         regs->ar_fpsr = FPSR_DEFAULT;                                                           \
 319         regs->loadrs = 0;                                                                       \
 320         regs->r8 = get_dumpable(current->mm);   /* set "don't zap registers" flag */            \
 321         regs->r12 = new_sp - 16;        /* allocate 16 byte scratch area */                     \
 322         if (unlikely(!get_dumpable(current->mm))) {                                                     \
 323                 /*                                                                              \
 324                  * Zap scratch regs to avoid leaking bits between processes with different      \
 325                  * uid/privileges.                                                              \
 326                  */                                                                             \
 327                 regs->ar_pfs = 0; regs->b0 = 0; regs->pr = 0;                                   \
 328                 regs->r1 = 0; regs->r9  = 0; regs->r11 = 0; regs->r13 = 0; regs->r15 = 0;       \
 329         }                                                                                       \
 330 } while (0)
 331
 332 /* Forward declarations, a strange C thing... */
 333 struct mm_struct;
 334 struct task_struct;
 335
 336 /*
 337  * Free all resources held by a thread. This is called after the
 338  * parent of DEAD_TASK has collected the exit status of the task via
 339  * wait().
 340  */
 341 #define release_thread(dead_task)
 342
 343 /* Get wait channel for task P.  */
 344 extern unsigned long get_wchan (struct task_struct *p);
 345
 346 /* Return instruction pointer of blocked task TSK.  */
 347 #define KSTK_EIP(tsk)                                   \
 348   ({                                                    \
 349         struct pt_regs *_regs = task_pt_regs(tsk);      \
 350         _regs->cr_iip + ia64_psr(_regs)->ri;            \
 351   })
 352
 353 /* Return stack pointer of blocked task TSK.  */
 354 #define KSTK_ESP(tsk)  ((tsk)->thread.ksp)
 355
 356 extern void ia64_getreg_unknown_kr (void);
 357 extern void ia64_setreg_unknown_kr (void);
 358
 359 #define ia64_get_kr(regnum)                                     \
 360 ({                                                              \
 361         unsigned long r = 0;                                    \
 362                                                                 \
 363         switch (regnum) {                                       \
 364             case 0: r = ia64_getreg(_IA64_REG_AR_KR0); break;   \
 365             case 1: r = ia64_getreg(_IA64_REG_AR_KR1); break;   \
 366             case 2: r = ia64_getreg(_IA64_REG_AR_KR2); break;   \
 367             case 3: r = ia64_getreg(_IA64_REG_AR_KR3); break;   \
 368             case 4: r = ia64_getreg(_IA64_REG_AR_KR4); break;   \
 369             case 5: r = ia64_getreg(_IA64_REG_AR_KR5); break;   \
 370             case 6: r = ia64_getreg(_IA64_REG_AR_KR6); break;   \
 371             case 7: r = ia64_getreg(_IA64_REG_AR_KR7); break;   \
 372             default: ia64_getreg_unknown_kr(); break;           \
 373         }                                                       \
 374         r;                                                      \
 375 })
 376
 377 #define ia64_set_kr(regnum, r)                                  \
 378 ({                                                              \
 379         switch (regnum) {                                       \
 380             case 0: ia64_setreg(_IA64_REG_AR_KR0, r); break;    \
 381             case 1: ia64_setreg(_IA64_REG_AR_KR1, r); break;    \
 382             case 2: ia64_setreg(_IA64_REG_AR_KR2, r); break;    \
 383             case 3: ia64_setreg(_IA64_REG_AR_KR3, r); break;    \
 384             case 4: ia64_setreg(_IA64_REG_AR_KR4, r); break;    \
 385             case 5: ia64_setreg(_IA64_REG_AR_KR5, r); break;    \
 386             case 6: ia64_setreg(_IA64_REG_AR_KR6, r); break;    \
 387             case 7: ia64_setreg(_IA64_REG_AR_KR7, r); break;    \
 388             default: ia64_setreg_unknown_kr(); break;           \
 389         }                                                       \
 390 })
 391
 392 /*
 393  * The following three macros can't be inline functions because we don't have struct
 394  * task_struct at this point.
 395  */
 396
 397 /*
 398  * Return TRUE if task T owns the fph partition of the CPU we're running on.
 399  * Must be called from code that has preemption disabled.
 400  */
 401 #define ia64_is_local_fpu_owner(t)                                                              \
 402 ({                                                                                              \
 403         struct task_struct *__ia64_islfo_task = (t);                                            \
 404         (__ia64_islfo_task->thread.last_fph_cpu == smp_processor_id()                           \
 405          && __ia64_islfo_task == (struct task_struct *) ia64_get_kr(IA64_KR_FPU_OWNER));        \
 406 })
 407
 408 /*
 409  * Mark task T as owning the fph partition of the CPU we're running on.
 410  * Must be called from code that has preemption disabled.
 411  */
 412 #define ia64_set_local_fpu_owner(t) do {                                                \
 413         struct task_struct *__ia64_slfo_task = (t);                                     \
 414         __ia64_slfo_task->thread.last_fph_cpu = smp_processor_id();                     \
 415         ia64_set_kr(IA64_KR_FPU_OWNER, (unsigned long) __ia64_slfo_task);               \
 416 } while (0)
 417
 418 /* Mark the fph partition of task T as being invalid on all CPUs.  */
 419 #define ia64_drop_fpu(t)        ((t)->thread.last_fph_cpu = -1)
 420
 421 extern void __ia64_init_fpu (void);
 422 extern void __ia64_save_fpu (struct ia64_fpreg *fph);
 423 extern void __ia64_load_fpu (struct ia64_fpreg *fph);
 424 extern void ia64_save_debug_regs (unsigned long *save_area);
 425 extern void ia64_load_debug_regs (unsigned long *save_area);
 426
 427 #define ia64_fph_enable()       do { ia64_rsm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
 428 #define ia64_fph_disable()      do { ia64_ssm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
 429
 430 /* load fp 0.0 into fph */
 431 static inline void
 432 ia64_init_fpu (void) {
 433         ia64_fph_enable();
 434         __ia64_init_fpu();
 435         ia64_fph_disable();
 436 }
 437
 438 /* save f32-f127 at FPH */
 439 static inline void
 440 ia64_save_fpu (struct ia64_fpreg *fph) {
 441         ia64_fph_enable();
 442         __ia64_save_fpu(fph);
 443         ia64_fph_disable();
 444 }
 445
 446 /* load f32-f127 from FPH */
 447 static inline void
 448 ia64_load_fpu (struct ia64_fpreg *fph) {
 449         ia64_fph_enable();
 450         __ia64_load_fpu(fph);
 451         ia64_fph_disable();
 452 }
 453
 454 static inline __u64
 455 ia64_clear_ic (void)
 456 {
 457         __u64 psr;
 458         psr = ia64_getreg(_IA64_REG_PSR);
 459         ia64_stop();
 460         ia64_rsm(IA64_PSR_I | IA64_PSR_IC);
 461         ia64_srlz_i();
 462         return psr;
 463 }
 464
 465 /*
 466  * Restore the psr.
 467  */
 468 static inline void
 469 ia64_set_psr (__u64 psr)
 470 {
 471         ia64_stop();
 472         ia64_setreg(_IA64_REG_PSR_L, psr);
 473         ia64_srlz_i();
 474 }
 475
 476 /*
 477  * Insert a translation into an instruction and/or data translation
 478  * register.
 479  */
 480 static inline void
 481 ia64_itr (__u64 target_mask, __u64 tr_num,
 482           __u64 vmaddr, __u64 pte,
 483           __u64 log_page_size)
 484 {
 485         ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
 486         ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
 487         ia64_stop();
 488         if (target_mask & 0x1)
 489                 ia64_itri(tr_num, pte);
 490         if (target_mask & 0x2)
 491                 ia64_itrd(tr_num, pte);
 492 }
 493
 494 /*
 495  * Insert a translation into the instruction and/or data translation
 496  * cache.
 497  */
 498 static inline void
 499 ia64_itc (__u64 target_mask, __u64 vmaddr, __u64 pte,
 500           __u64 log_page_size)
 501 {
 502         ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
 503         ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
 504         ia64_stop();
 505         /* as per EAS2.6, itc must be the last instruction in an instruction group */
 506         if (target_mask & 0x1)
 507                 ia64_itci(pte);
 508         if (target_mask & 0x2)
 509                 ia64_itcd(pte);
 510 }
 511
 512 /*
 513  * Purge a range of addresses from instruction and/or data translation
 514  * register(s).
 515  */
 516 static inline void
 517 ia64_ptr (__u64 target_mask, __u64 vmaddr, __u64 log_size)
 518 {
 519         if (target_mask & 0x1)
 520                 ia64_ptri(vmaddr, (log_size << 2));
 521         if (target_mask & 0x2)
 522                 ia64_ptrd(vmaddr, (log_size << 2));
 523 }
 524
 525 /* Set the interrupt vector address.  The address must be suitably aligned (32KB).  */
 526 static inline void
 527 ia64_set_iva (void *ivt_addr)
 528 {
 529         ia64_setreg(_IA64_REG_CR_IVA, (__u64) ivt_addr);
 530         ia64_srlz_i();
 531 }
 532
 533 /* Set the page table address and control bits.  */
 534 static inline void
 535 ia64_set_pta (__u64 pta)
 536 {
 537         /* Note: srlz.i implies srlz.d */
 538         ia64_setreg(_IA64_REG_CR_PTA, pta);
 539         ia64_srlz_i();
 540 }
 541
 542 static inline void
 543 ia64_eoi (void)
 544 {
 545         ia64_setreg(_IA64_REG_CR_EOI, 0);
 546         ia64_srlz_d();
 547 }
 548
 549 #define cpu_relax()     ia64_hint(ia64_hint_pause)
 550
 551 static inline int
 552 ia64_get_irr(unsigned int vector)
 553 {
 554         unsigned int reg = vector / 64;
 555         unsigned int bit = vector % 64;
 556         u64 irr;
 557
 558         switch (reg) {
 559         case 0: irr = ia64_getreg(_IA64_REG_CR_IRR0); break;
 560         case 1: irr = ia64_getreg(_IA64_REG_CR_IRR1); break;
 561         case 2: irr = ia64_getreg(_IA64_REG_CR_IRR2); break;
 562         case 3: irr = ia64_getreg(_IA64_REG_CR_IRR3); break;
 563         }
 564
 565         return test_bit(bit, &irr);
 566 }
 567
 568 static inline void
 569 ia64_set_lrr0 (unsigned long val)
 570 {
 571         ia64_setreg(_IA64_REG_CR_LRR0, val);
 572         ia64_srlz_d();
 573 }
 574
 575 static inline void
 576 ia64_set_lrr1 (unsigned long val)
 577 {
 578         ia64_setreg(_IA64_REG_CR_LRR1, val);
 579         ia64_srlz_d();
 580 }
 581
 582
 583 /*
 584  * Given the address to which a spill occurred, return the unat bit
 585  * number that corresponds to this address.
 586  */
 587 static inline __u64
 588 ia64_unat_pos (void *spill_addr)
 589 {
 590         return ((__u64) spill_addr >> 3) & 0x3f;
 591 }
 592
 593 /*
 594  * Set the NaT bit of an integer register which was spilled at address
 595  * SPILL_ADDR.  UNAT is the mask to be updated.
 596  */
 597 static inline void
 598 ia64_set_unat (__u64 *unat, void *spill_addr, unsigned long nat)
 599 {
 600         __u64 bit = ia64_unat_pos(spill_addr);
 601         __u64 mask = 1UL << bit;
 602
 603         *unat = (*unat & ~mask) | (nat << bit);
 604 }
 605
 606 /*
 607  * Return saved PC of a blocked thread.
 608  * Note that the only way T can block is through a call to schedule() -> switch_to().
 609  */
 610 static inline unsigned long
 611 thread_saved_pc (struct task_struct *t)
 612 {
 613         struct unw_frame_info info;
 614         unsigned long ip;
 615
 616         unw_init_from_blocked_task(&info, t);
 617         if (unw_unwind(&info) < 0)
 618                 return 0;
 619         unw_get_ip(&info, &ip);
 620         return ip;
 621 }
 622
 623 /*
 624  * Get the current instruction/program counter value.
 625  */
 626 #define current_text_addr() \
 627         ({ void *_pc; _pc = (void *)ia64_getreg(_IA64_REG_IP); _pc; })
 628
 629 static inline __u64
 630 ia64_get_ivr (void)
 631 {
 632         __u64 r;
 633         ia64_srlz_d();
 634         r = ia64_getreg(_IA64_REG_CR_IVR);
 635         ia64_srlz_d();
 636         return r;
 637 }
 638
 639 static inline void
 640 ia64_set_dbr (__u64 regnum, __u64 value)
 641 {
 642         __ia64_set_dbr(regnum, value);
 643 #ifdef CONFIG_ITANIUM
 644         ia64_srlz_d();
 645 #endif
 646 }
 647
 648 static inline __u64
 649 ia64_get_dbr (__u64 regnum)
 650 {
 651         __u64 retval;
 652
 653         retval = __ia64_get_dbr(regnum);
 654 #ifdef CONFIG_ITANIUM
 655         ia64_srlz_d();
 656 #endif
 657         return retval;
 658 }
 659
 660 static inline __u64
 661 ia64_rotr (__u64 w, __u64 n)
 662 {
 663         return (w >> n) | (w << (64 - n));
 664 }
 665
 666 #define ia64_rotl(w,n)  ia64_rotr((w), (64) - (n))
 667
 668 /*
 669  * Take a mapped kernel address and return the equivalent address
 670  * in the region 7 identity mapped virtual area.
 671  */
 672 static inline void *
 673 ia64_imva (void *addr)
 674 {
 675         void *result;
 676         result = (void *) ia64_tpa(addr);
 677         return __va(result);
 678 }
 679
 680 #define ARCH_HAS_PREFETCH
 681 #define ARCH_HAS_PREFETCHW
 682 #define ARCH_HAS_SPINLOCK_PREFETCH
 683 #define PREFETCH_STRIDE                 L1_CACHE_BYTES
 684
 685 static inline void
 686 prefetch (const void *x)
 687 {
 688          ia64_lfetch(ia64_lfhint_none, x);
 689 }
 690
 691 static inline void
 692 prefetchw (const void *x)
 693 {
 694         ia64_lfetch_excl(ia64_lfhint_none, x);
 695 }
 696
 697 #define spin_lock_prefetch(x)   prefetchw(x)
 698
 699 extern unsigned long boot_option_idle_override;
 700
 701 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_FORCE_MWAIT,
 702                          IDLE_NOMWAIT, IDLE_POLL};
 703
 704 void default_idle(void);
 705
 706 #define ia64_platform_is(x) (strcmp(x, ia64_platform_name) == 0)
 707
 708 #endif /* !__ASSEMBLY__ */
 709
 710 #endif /* _ASM_IA64_PROCESSOR_H */