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   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 IA64_NUM_DBG_REGS       8
  23
  24 #define DEFAULT_MAP_BASE        __IA64_UL_CONST(0x2000000000000000)
  25 #define DEFAULT_TASK_SIZE       __IA64_UL_CONST(0xa000000000000000)
  26
  27 /*
  28  * TASK_SIZE really is a mis-named.  It really is the maximum user
  29  * space address (plus one).  On IA-64, there are five regions of 2TB
  30  * each (assuming 8KB page size), for a total of 8TB of user virtual
  31  * address space.
  32  */
  33 #define TASK_SIZE               (current->thread.task_size)
  34
  35 /*
  36  * This decides where the kernel will search for a free chunk of vm
  37  * space during mmap's.
  38  */
  39 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
  40
  41 #define IA64_THREAD_FPH_VALID   (__IA64_UL(1) << 0)     /* floating-point high state valid? */
  42 #define IA64_THREAD_DBG_VALID   (__IA64_UL(1) << 1)     /* debug registers valid? */
  43 #define IA64_THREAD_PM_VALID    (__IA64_UL(1) << 2)     /* performance registers valid? */
  44 #define IA64_THREAD_UAC_NOPRINT (__IA64_UL(1) << 3)     /* don't log unaligned accesses */
  45 #define IA64_THREAD_UAC_SIGBUS  (__IA64_UL(1) << 4)     /* generate SIGBUS on unaligned acc. */
  46 #define IA64_THREAD_MIGRATION   (__IA64_UL(1) << 5)     /* require migration
  47                                                            sync at ctx sw */
  48 #define IA64_THREAD_FPEMU_NOPRINT (__IA64_UL(1) << 6)   /* don't log any fpswa faults */
  49 #define IA64_THREAD_FPEMU_SIGFPE  (__IA64_UL(1) << 7)   /* send a SIGFPE for fpswa faults */
  50
  51 #define IA64_THREAD_UAC_SHIFT   3
  52 #define IA64_THREAD_UAC_MASK    (IA64_THREAD_UAC_NOPRINT | IA64_THREAD_UAC_SIGBUS)
  53 #define IA64_THREAD_FPEMU_SHIFT 6
  54 #define IA64_THREAD_FPEMU_MASK  (IA64_THREAD_FPEMU_NOPRINT | IA64_THREAD_FPEMU_SIGFPE)
  55
  56
  57 /*
  58  * This shift should be large enough to be able to represent 1000000000/itc_freq with good
  59  * accuracy while being small enough to fit 10*1000000000<<IA64_NSEC_PER_CYC_SHIFT in 64 bits
  60  * (this will give enough slack to represent 10 seconds worth of time as a scaled number).
  61  */
  62 #define IA64_NSEC_PER_CYC_SHIFT 30
  63
  64 #ifndef __ASSEMBLY__
  65
  66 #include <linux/cache.h>
  67 #include <linux/compiler.h>
  68 #include <linux/threads.h>
  69 #include <linux/types.h>
  70
  71 #include <asm/fpu.h>
  72 #include <asm/page.h>
  73 #include <asm/percpu.h>
  74 #include <asm/rse.h>
  75 #include <asm/unwind.h>
  76 #include <asm/atomic.h>
  77 #ifdef CONFIG_NUMA
  78 #include <asm/nodedata.h>
  79 #endif
  80
  81 /* like above but expressed as bitfields for more efficient access: */
  82 struct ia64_psr {
  83         __u64 reserved0 : 1;
  84         __u64 be : 1;
  85         __u64 up : 1;
  86         __u64 ac : 1;
  87         __u64 mfl : 1;
  88         __u64 mfh : 1;
  89         __u64 reserved1 : 7;
  90         __u64 ic : 1;
  91         __u64 i : 1;
  92         __u64 pk : 1;
  93         __u64 reserved2 : 1;
  94         __u64 dt : 1;
  95         __u64 dfl : 1;
  96         __u64 dfh : 1;
  97         __u64 sp : 1;
  98         __u64 pp : 1;
  99         __u64 di : 1;
 100         __u64 si : 1;
 101         __u64 db : 1;
 102         __u64 lp : 1;
 103         __u64 tb : 1;
 104         __u64 rt : 1;
 105         __u64 reserved3 : 4;
 106         __u64 cpl : 2;
 107         __u64 is : 1;
 108         __u64 mc : 1;
 109         __u64 it : 1;
 110         __u64 id : 1;
 111         __u64 da : 1;
 112         __u64 dd : 1;
 113         __u64 ss : 1;
 114         __u64 ri : 2;
 115         __u64 ed : 1;
 116         __u64 bn : 1;
 117         __u64 reserved4 : 19;
 118 };
 119
 120 /*
 121  * CPU type, hardware bug flags, and per-CPU state.  Frequently used
 122  * state comes earlier:
 123  */
 124 struct cpuinfo_ia64 {
 125         __u32 softirq_pending;
 126         __u64 itm_delta;        /* # of clock cycles between clock ticks */
 127         __u64 itm_next;         /* interval timer mask value to use for next clock tick */
 128         __u64 nsec_per_cyc;     /* (1000000000<<IA64_NSEC_PER_CYC_SHIFT)/itc_freq */
 129         __u64 unimpl_va_mask;   /* mask of unimplemented virtual address bits (from PAL) */
 130         __u64 unimpl_pa_mask;   /* mask of unimplemented physical address bits (from PAL) */
 131         __u64 itc_freq;         /* frequency of ITC counter */
 132         __u64 proc_freq;        /* frequency of processor */
 133         __u64 cyc_per_usec;     /* itc_freq/1000000 */
 134         __u64 ptce_base;
 135         __u32 ptce_count[2];
 136         __u32 ptce_stride[2];
 137         struct task_struct *ksoftirqd;  /* kernel softirq daemon for this CPU */
 138
 139 #ifdef CONFIG_SMP
 140         __u64 loops_per_jiffy;
 141         int cpu;
 142         __u32 socket_id;        /* physical processor socket id */
 143         __u16 core_id;          /* core id */
 144         __u16 thread_id;        /* thread id */
 145         __u16 num_log;          /* Total number of logical processors on
 146                                  * this socket that were successfully booted */
 147         __u8  cores_per_socket; /* Cores per processor socket */
 148         __u8  threads_per_core; /* Threads per core */
 149 #endif
 150
 151         /* CPUID-derived information: */
 152         __u64 ppn;
 153         __u64 features;
 154         __u8 number;
 155         __u8 revision;
 156         __u8 model;
 157         __u8 family;
 158         __u8 archrev;
 159         char vendor[16];
 160         char *model_name;
 161
 162 #ifdef CONFIG_NUMA
 163         struct ia64_node_data *node_data;
 164 #endif
 165 };
 166
 167 DECLARE_PER_CPU(struct cpuinfo_ia64, cpu_info);
 168
 169 /*
 170  * The "local" data variable.  It refers to the per-CPU data of the currently executing
 171  * CPU, much like "current" points to the per-task data of the currently executing task.
 172  * Do not use the address of local_cpu_data, since it will be different from
 173  * cpu_data(smp_processor_id())!
 174  */
 175 #define local_cpu_data          (&__ia64_per_cpu_var(cpu_info))
 176 #define cpu_data(cpu)           (&per_cpu(cpu_info, cpu))
 177
 178 extern void print_cpu_info (struct cpuinfo_ia64 *);
 179
 180 typedef struct {
 181         unsigned long seg;
 182 } mm_segment_t;
 183
 184 #define SET_UNALIGN_CTL(task,value)                                                             \
 185 ({                                                                                              \
 186         (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_UAC_MASK)                  \
 187                                 | (((value) << IA64_THREAD_UAC_SHIFT) & IA64_THREAD_UAC_MASK)); \
 188         0;                                                                                      \
 189 })
 190 #define GET_UNALIGN_CTL(task,addr)                                                              \
 191 ({                                                                                              \
 192         put_user(((task)->thread.flags & IA64_THREAD_UAC_MASK) >> IA64_THREAD_UAC_SHIFT,        \
 193                  (int __user *) (addr));                                                        \
 194 })
 195
 196 #define SET_FPEMU_CTL(task,value)                                                               \
 197 ({                                                                                              \
 198         (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_FPEMU_MASK)                \
 199                           | (((value) << IA64_THREAD_FPEMU_SHIFT) & IA64_THREAD_FPEMU_MASK));   \
 200         0;                                                                                      \
 201 })
 202 #define GET_FPEMU_CTL(task,addr)                                                                \
 203 ({                                                                                              \
 204         put_user(((task)->thread.flags & IA64_THREAD_FPEMU_MASK) >> IA64_THREAD_FPEMU_SHIFT,    \
 205                  (int __user *) (addr));                                                        \
 206 })
 207
 208 #ifdef CONFIG_IA32_SUPPORT
 209 struct desc_struct {
 210         unsigned int a, b;
 211 };
 212
 213 #define desc_empty(desc)                (!((desc)->a + (desc)->b))
 214 #define desc_equal(desc1, desc2)        (((desc1)->a == (desc2)->a) && ((desc1)->b == (desc2)->b))
 215
 216 #define GDT_ENTRY_TLS_ENTRIES   3
 217 #define GDT_ENTRY_TLS_MIN       6
 218 #define GDT_ENTRY_TLS_MAX       (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1)
 219
 220 #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
 221
 222 struct partial_page_list;
 223 #endif
 224
 225 struct thread_struct {
 226         __u32 flags;                    /* various thread flags (see IA64_THREAD_*) */
 227         /* writing on_ustack is performance-critical, so it's worth spending 8 bits on it... */
 228         __u8 on_ustack;                 /* executing on user-stacks? */
 229         __u8 pad[3];
 230         __u64 ksp;                      /* kernel stack pointer */
 231         __u64 map_base;                 /* base address for get_unmapped_area() */
 232         __u64 task_size;                /* limit for task size */
 233         __u64 rbs_bot;                  /* the base address for the RBS */
 234         int last_fph_cpu;               /* CPU that may hold the contents of f32-f127 */
 235
 236 #ifdef CONFIG_IA32_SUPPORT
 237         __u64 eflag;                    /* IA32 EFLAGS reg */
 238         __u64 fsr;                      /* IA32 floating pt status reg */
 239         __u64 fcr;                      /* IA32 floating pt control reg */
 240         __u64 fir;                      /* IA32 fp except. instr. reg */
 241         __u64 fdr;                      /* IA32 fp except. data reg */
 242         __u64 old_k1;                   /* old value of ar.k1 */
 243         __u64 old_iob;                  /* old IOBase value */
 244         struct partial_page_list *ppl;  /* partial page list for 4K page size issue */
 245         /* cached TLS descriptors. */
 246         struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
 247
 248 # define INIT_THREAD_IA32       .eflag =        0,                      \
 249                                 .fsr =          0,                      \
 250                                 .fcr =          0x17800000037fULL,      \
 251                                 .fir =          0,                      \
 252                                 .fdr =          0,                      \
 253                                 .old_k1 =       0,                      \
 254                                 .old_iob =      0,                      \
 255                                 .ppl =          NULL,
 256 #else
 257 # define INIT_THREAD_IA32
 258 #endif /* CONFIG_IA32_SUPPORT */
 259 #ifdef CONFIG_PERFMON
 260         void *pfm_context;                   /* pointer to detailed PMU context */
 261         unsigned long pfm_needs_checking;    /* when >0, pending perfmon work on kernel exit */
 262 # define INIT_THREAD_PM         .pfm_context =          NULL,     \
 263                                 .pfm_needs_checking =   0UL,
 264 #else
 265 # define INIT_THREAD_PM
 266 #endif
 267         __u64 dbr[IA64_NUM_DBG_REGS];
 268         __u64 ibr[IA64_NUM_DBG_REGS];
 269         struct ia64_fpreg fph[96];      /* saved/loaded on demand */
 270 };
 271
 272 #define INIT_THREAD {                                           \
 273         .flags =        0,                                      \
 274         .on_ustack =    0,                                      \
 275         .ksp =          0,                                      \
 276         .map_base =     DEFAULT_MAP_BASE,                       \
 277         .rbs_bot =      STACK_TOP - DEFAULT_USER_STACK_SIZE,    \
 278         .task_size =    DEFAULT_TASK_SIZE,                      \
 279         .last_fph_cpu =  -1,                                    \
 280         INIT_THREAD_IA32                                        \
 281         INIT_THREAD_PM                                          \
 282         .dbr =          {0, },                                  \
 283         .ibr =          {0, },                                  \
 284         .fph =          {{{{0}}}, }                             \
 285 }
 286
 287 #define start_thread(regs,new_ip,new_sp) do {                                                   \
 288         set_fs(USER_DS);                                                                        \
 289         regs->cr_ipsr = ((regs->cr_ipsr | (IA64_PSR_BITS_TO_SET | IA64_PSR_CPL))                \
 290                          & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_RI | IA64_PSR_IS));              \
 291         regs->cr_iip = new_ip;                                                                  \
 292         regs->ar_rsc = 0xf;             /* eager mode, privilege level 3 */                     \
 293         regs->ar_rnat = 0;                                                                      \
 294         regs->ar_bspstore = current->thread.rbs_bot;                                            \
 295         regs->ar_fpsr = FPSR_DEFAULT;                                                           \
 296         regs->loadrs = 0;                                                                       \
 297         regs->r8 = current->mm->dumpable;       /* set "don't zap registers" flag */            \
 298         regs->r12 = new_sp - 16;        /* allocate 16 byte scratch area */                     \
 299         if (unlikely(!current->mm->dumpable)) {                                                 \
 300                 /*                                                                              \
 301                  * Zap scratch regs to avoid leaking bits between processes with different      \
 302                  * uid/privileges.                                                              \
 303                  */                                                                             \
 304                 regs->ar_pfs = 0; regs->b0 = 0; regs->pr = 0;                                   \
 305                 regs->r1 = 0; regs->r9  = 0; regs->r11 = 0; regs->r13 = 0; regs->r15 = 0;       \
 306         }                                                                                       \
 307 } while (0)
 308
 309 /* Forward declarations, a strange C thing... */
 310 struct mm_struct;
 311 struct task_struct;
 312
 313 /*
 314  * Free all resources held by a thread. This is called after the
 315  * parent of DEAD_TASK has collected the exit status of the task via
 316  * wait().
 317  */
 318 #define release_thread(dead_task)
 319
 320 /* Prepare to copy thread state - unlazy all lazy status */
 321 #define prepare_to_copy(tsk)    do { } while (0)
 322
 323 /*
 324  * This is the mechanism for creating a new kernel thread.
 325  *
 326  * NOTE 1: Only a kernel-only process (ie the swapper or direct
 327  * descendants who haven't done an "execve()") should use this: it
 328  * will work within a system call from a "real" process, but the
 329  * process memory space will not be free'd until both the parent and
 330  * the child have exited.
 331  *
 332  * NOTE 2: This MUST NOT be an inlined function.  Otherwise, we get
 333  * into trouble in init/main.c when the child thread returns to
 334  * do_basic_setup() and the timing is such that free_initmem() has
 335  * been called already.
 336  */
 337 extern pid_t kernel_thread (int (*fn)(void *), void *arg, unsigned long flags);
 338
 339 /* Get wait channel for task P.  */
 340 extern unsigned long get_wchan (struct task_struct *p);
 341
 342 /* Return instruction pointer of blocked task TSK.  */
 343 #define KSTK_EIP(tsk)                                   \
 344   ({                                                    \
 345         struct pt_regs *_regs = task_pt_regs(tsk);      \
 346         _regs->cr_iip + ia64_psr(_regs)->ri;            \
 347   })
 348
 349 /* Return stack pointer of blocked task TSK.  */
 350 #define KSTK_ESP(tsk)  ((tsk)->thread.ksp)
 351
 352 extern void ia64_getreg_unknown_kr (void);
 353 extern void ia64_setreg_unknown_kr (void);
 354
 355 #define ia64_get_kr(regnum)                                     \
 356 ({                                                              \
 357         unsigned long r = 0;                                    \
 358                                                                 \
 359         switch (regnum) {                                       \
 360             case 0: r = ia64_getreg(_IA64_REG_AR_KR0); break;   \
 361             case 1: r = ia64_getreg(_IA64_REG_AR_KR1); break;   \
 362             case 2: r = ia64_getreg(_IA64_REG_AR_KR2); break;   \
 363             case 3: r = ia64_getreg(_IA64_REG_AR_KR3); break;   \
 364             case 4: r = ia64_getreg(_IA64_REG_AR_KR4); break;   \
 365             case 5: r = ia64_getreg(_IA64_REG_AR_KR5); break;   \
 366             case 6: r = ia64_getreg(_IA64_REG_AR_KR6); break;   \
 367             case 7: r = ia64_getreg(_IA64_REG_AR_KR7); break;   \
 368             default: ia64_getreg_unknown_kr(); break;           \
 369         }                                                       \
 370         r;                                                      \
 371 })
 372
 373 #define ia64_set_kr(regnum, r)                                  \
 374 ({                                                              \
 375         switch (regnum) {                                       \
 376             case 0: ia64_setreg(_IA64_REG_AR_KR0, r); break;    \
 377             case 1: ia64_setreg(_IA64_REG_AR_KR1, r); break;    \
 378             case 2: ia64_setreg(_IA64_REG_AR_KR2, r); break;    \
 379             case 3: ia64_setreg(_IA64_REG_AR_KR3, r); break;    \
 380             case 4: ia64_setreg(_IA64_REG_AR_KR4, r); break;    \
 381             case 5: ia64_setreg(_IA64_REG_AR_KR5, r); break;    \
 382             case 6: ia64_setreg(_IA64_REG_AR_KR6, r); break;    \
 383             case 7: ia64_setreg(_IA64_REG_AR_KR7, r); break;    \
 384             default: ia64_setreg_unknown_kr(); break;           \
 385         }                                                       \
 386 })
 387
 388 /*
 389  * The following three macros can't be inline functions because we don't have struct
 390  * task_struct at this point.
 391  */
 392
 393 /*
 394  * Return TRUE if task T owns the fph partition of the CPU we're running on.
 395  * Must be called from code that has preemption disabled.
 396  */
 397 #define ia64_is_local_fpu_owner(t)                                                              \
 398 ({                                                                                              \
 399         struct task_struct *__ia64_islfo_task = (t);                                            \
 400         (__ia64_islfo_task->thread.last_fph_cpu == smp_processor_id()                           \
 401          && __ia64_islfo_task == (struct task_struct *) ia64_get_kr(IA64_KR_FPU_OWNER));        \
 402 })
 403
 404 /*
 405  * Mark task T as owning the fph partition of the CPU we're running on.
 406  * Must be called from code that has preemption disabled.
 407  */
 408 #define ia64_set_local_fpu_owner(t) do {                                                \
 409         struct task_struct *__ia64_slfo_task = (t);                                     \
 410         __ia64_slfo_task->thread.last_fph_cpu = smp_processor_id();                     \
 411         ia64_set_kr(IA64_KR_FPU_OWNER, (unsigned long) __ia64_slfo_task);               \
 412 } while (0)
 413
 414 /* Mark the fph partition of task T as being invalid on all CPUs.  */
 415 #define ia64_drop_fpu(t)        ((t)->thread.last_fph_cpu = -1)
 416
 417 extern void __ia64_init_fpu (void);
 418 extern void __ia64_save_fpu (struct ia64_fpreg *fph);
 419 extern void __ia64_load_fpu (struct ia64_fpreg *fph);
 420 extern void ia64_save_debug_regs (unsigned long *save_area);
 421 extern void ia64_load_debug_regs (unsigned long *save_area);
 422
 423 #ifdef CONFIG_IA32_SUPPORT
 424 extern void ia32_save_state (struct task_struct *task);
 425 extern void ia32_load_state (struct task_struct *task);
 426 #endif
 427
 428 #define ia64_fph_enable()       do { ia64_rsm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
 429 #define ia64_fph_disable()      do { ia64_ssm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
 430
 431 /* load fp 0.0 into fph */
 432 static inline void
 433 ia64_init_fpu (void) {
 434         ia64_fph_enable();
 435         __ia64_init_fpu();
 436         ia64_fph_disable();
 437 }
 438
 439 /* save f32-f127 at FPH */
 440 static inline void
 441 ia64_save_fpu (struct ia64_fpreg *fph) {
 442         ia64_fph_enable();
 443         __ia64_save_fpu(fph);
 444         ia64_fph_disable();
 445 }
 446
 447 /* load f32-f127 from FPH */
 448 static inline void
 449 ia64_load_fpu (struct ia64_fpreg *fph) {
 450         ia64_fph_enable();
 451         __ia64_load_fpu(fph);
 452         ia64_fph_disable();
 453 }
 454
 455 static inline __u64
 456 ia64_clear_ic (void)
 457 {
 458         __u64 psr;
 459         psr = ia64_getreg(_IA64_REG_PSR);
 460         ia64_stop();
 461         ia64_rsm(IA64_PSR_I | IA64_PSR_IC);
 462         ia64_srlz_i();
 463         return psr;
 464 }
 465
 466 /*
 467  * Restore the psr.
 468  */
 469 static inline void
 470 ia64_set_psr (__u64 psr)
 471 {
 472         ia64_stop();
 473         ia64_setreg(_IA64_REG_PSR_L, psr);
 474         ia64_srlz_d();
 475 }
 476
 477 /*
 478  * Insert a translation into an instruction and/or data translation
 479  * register.
 480  */
 481 static inline void
 482 ia64_itr (__u64 target_mask, __u64 tr_num,
 483           __u64 vmaddr, __u64 pte,
 484           __u64 log_page_size)
 485 {
 486         ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
 487         ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
 488         ia64_stop();
 489         if (target_mask & 0x1)
 490                 ia64_itri(tr_num, pte);
 491         if (target_mask & 0x2)
 492                 ia64_itrd(tr_num, pte);
 493 }
 494
 495 /*
 496  * Insert a translation into the instruction and/or data translation
 497  * cache.
 498  */
 499 static inline void
 500 ia64_itc (__u64 target_mask, __u64 vmaddr, __u64 pte,
 501           __u64 log_page_size)
 502 {
 503         ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
 504         ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
 505         ia64_stop();
 506         /* as per EAS2.6, itc must be the last instruction in an instruction group */
 507         if (target_mask & 0x1)
 508                 ia64_itci(pte);
 509         if (target_mask & 0x2)
 510                 ia64_itcd(pte);
 511 }
 512
 513 /*
 514  * Purge a range of addresses from instruction and/or data translation
 515  * register(s).
 516  */
 517 static inline void
 518 ia64_ptr (__u64 target_mask, __u64 vmaddr, __u64 log_size)
 519 {
 520         if (target_mask & 0x1)
 521                 ia64_ptri(vmaddr, (log_size << 2));
 522         if (target_mask & 0x2)
 523                 ia64_ptrd(vmaddr, (log_size << 2));
 524 }
 525
 526 /* Set the interrupt vector address.  The address must be suitably aligned (32KB).  */
 527 static inline void
 528 ia64_set_iva (void *ivt_addr)
 529 {
 530         ia64_setreg(_IA64_REG_CR_IVA, (__u64) ivt_addr);
 531         ia64_srlz_i();
 532 }
 533
 534 /* Set the page table address and control bits.  */
 535 static inline void
 536 ia64_set_pta (__u64 pta)
 537 {
 538         /* Note: srlz.i implies srlz.d */
 539         ia64_setreg(_IA64_REG_CR_PTA, pta);
 540         ia64_srlz_i();
 541 }
 542
 543 static inline void
 544 ia64_eoi (void)
 545 {
 546         ia64_setreg(_IA64_REG_CR_EOI, 0);
 547         ia64_srlz_d();
 548 }
 549
 550 #define cpu_relax()     ia64_hint(ia64_hint_pause)
 551
 552 static inline int
 553 ia64_get_irr(unsigned int vector)
 554 {
 555         unsigned int reg = vector / 64;
 556         unsigned int bit = vector % 64;
 557         u64 irr;
 558
 559         switch (reg) {
 560         case 0: irr = ia64_getreg(_IA64_REG_CR_IRR0); break;
 561         case 1: irr = ia64_getreg(_IA64_REG_CR_IRR1); break;
 562         case 2: irr = ia64_getreg(_IA64_REG_CR_IRR2); break;
 563         case 3: irr = ia64_getreg(_IA64_REG_CR_IRR3); break;
 564         }
 565
 566         return test_bit(bit, &irr);
 567 }
 568
 569 static inline void
 570 ia64_set_lrr0 (unsigned long val)
 571 {
 572         ia64_setreg(_IA64_REG_CR_LRR0, val);
 573         ia64_srlz_d();
 574 }
 575
 576 static inline void
 577 ia64_set_lrr1 (unsigned long val)
 578 {
 579         ia64_setreg(_IA64_REG_CR_LRR1, val);
 580         ia64_srlz_d();
 581 }
 582
 583
 584 /*
 585  * Given the address to which a spill occurred, return the unat bit
 586  * number that corresponds to this address.
 587  */
 588 static inline __u64
 589 ia64_unat_pos (void *spill_addr)
 590 {
 591         return ((__u64) spill_addr >> 3) & 0x3f;
 592 }
 593
 594 /*
 595  * Set the NaT bit of an integer register which was spilled at address
 596  * SPILL_ADDR.  UNAT is the mask to be updated.
 597  */
 598 static inline void
 599 ia64_set_unat (__u64 *unat, void *spill_addr, unsigned long nat)
 600 {
 601         __u64 bit = ia64_unat_pos(spill_addr);
 602         __u64 mask = 1UL << bit;
 603
 604         *unat = (*unat & ~mask) | (nat << bit);
 605 }
 606
 607 /*
 608  * Return saved PC of a blocked thread.
 609  * Note that the only way T can block is through a call to schedule() -> switch_to().
 610  */
 611 static inline unsigned long
 612 thread_saved_pc (struct task_struct *t)
 613 {
 614         struct unw_frame_info info;
 615         unsigned long ip;
 616
 617         unw_init_from_blocked_task(&info, t);
 618         if (unw_unwind(&info) < 0)
 619                 return 0;
 620         unw_get_ip(&info, &ip);
 621         return ip;
 622 }
 623
 624 /*
 625  * Get the current instruction/program counter value.
 626  */
 627 #define current_text_addr() \
 628         ({ void *_pc; _pc = (void *)ia64_getreg(_IA64_REG_IP); _pc; })
 629
 630 static inline __u64
 631 ia64_get_ivr (void)
 632 {
 633         __u64 r;
 634         ia64_srlz_d();
 635         r = ia64_getreg(_IA64_REG_CR_IVR);
 636         ia64_srlz_d();
 637         return r;
 638 }
 639
 640 static inline void
 641 ia64_set_dbr (__u64 regnum, __u64 value)
 642 {
 643         __ia64_set_dbr(regnum, value);
 644 #ifdef CONFIG_ITANIUM
 645         ia64_srlz_d();
 646 #endif
 647 }
 648
 649 static inline __u64
 650 ia64_get_dbr (__u64 regnum)
 651 {
 652         __u64 retval;
 653
 654         retval = __ia64_get_dbr(regnum);
 655 #ifdef CONFIG_ITANIUM
 656         ia64_srlz_d();
 657 #endif
 658         return retval;
 659 }
 660
 661 static inline __u64
 662 ia64_rotr (__u64 w, __u64 n)
 663 {
 664         return (w >> n) | (w << (64 - n));
 665 }
 666
 667 #define ia64_rotl(w,n)  ia64_rotr((w), (64) - (n))
 668
 669 /*
 670  * Take a mapped kernel address and return the equivalent address
 671  * in the region 7 identity mapped virtual area.
 672  */
 673 static inline void *
 674 ia64_imva (void *addr)
 675 {
 676         void *result;
 677         result = (void *) ia64_tpa(addr);
 678         return __va(result);
 679 }
 680
 681 #define ARCH_HAS_PREFETCH
 682 #define ARCH_HAS_PREFETCHW
 683 #define ARCH_HAS_SPINLOCK_PREFETCH
 684 #define PREFETCH_STRIDE                 L1_CACHE_BYTES
 685
 686 static inline void
 687 prefetch (const void *x)
 688 {
 689          ia64_lfetch(ia64_lfhint_none, x);
 690 }
 691
 692 static inline void
 693 prefetchw (const void *x)
 694 {
 695         ia64_lfetch_excl(ia64_lfhint_none, x);
 696 }
 697
 698 #define spin_lock_prefetch(x)   prefetchw(x)
 699
 700 extern unsigned long boot_option_idle_override;
 701
 702 #endif /* !__ASSEMBLY__ */
 703
 704 #endif /* _ASM_IA64_PROCESSOR_H */