LXR linux/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 IA64_NUM_PHYS_STACK_REG 96
  23#define IA64_NUM_DBG_REGS       8
  24
  25#define DEFAULT_MAP_BASE        __IA64_UL_CONST(0x2000000000000000)
  26#define DEFAULT_TASK_SIZE       __IA64_UL_CONST(0xa000000000000000)
  27
  28/*
  29 * TASK_SIZE really is a mis-named.  It really is the maximum user
  30 * space address (plus one).  On IA-64, there are five regions of 2TB
  31 * each (assuming 8KB page size), for a total of 8TB of user virtual
  32 * address space.
  33 */
  34#define TASK_SIZE_OF(tsk)       ((tsk)->thread.task_size)
  35#define TASK_SIZE               TASK_SIZE_OF(current)
  36
  37/*
  38 * This decides where the kernel will search for a free chunk of vm
  39 * space during mmap's.
  40 */
  41#define TASK_UNMAPPED_BASE      (current->thread.map_base)
  42
  43#define IA64_THREAD_FPH_VALID   (__IA64_UL(1) << 0)     /* floating-point high state valid? */
  44#define IA64_THREAD_DBG_VALID   (__IA64_UL(1) << 1)     /* debug registers valid? */
  45#define IA64_THREAD_PM_VALID    (__IA64_UL(1) << 2)     /* performance registers valid? */
  46#define IA64_THREAD_UAC_NOPRINT (__IA64_UL(1) << 3)     /* don't log unaligned accesses */
  47#define IA64_THREAD_UAC_SIGBUS  (__IA64_UL(1) << 4)     /* generate SIGBUS on unaligned acc. */
  48#define IA64_THREAD_MIGRATION   (__IA64_UL(1) << 5)     /* require migration
  49                                                           sync at ctx sw */
  50#define IA64_THREAD_FPEMU_NOPRINT (__IA64_UL(1) << 6)   /* don't log any fpswa faults */
  51#define IA64_THREAD_FPEMU_SIGFPE  (__IA64_UL(1) << 7)   /* send a SIGFPE for fpswa faults */
  52
  53#define IA64_THREAD_UAC_SHIFT   3
  54#define IA64_THREAD_UAC_MASK    (IA64_THREAD_UAC_NOPRINT | IA64_THREAD_UAC_SIGBUS)
  55#define IA64_THREAD_FPEMU_SHIFT 6
  56#define IA64_THREAD_FPEMU_MASK  (IA64_THREAD_FPEMU_NOPRINT | IA64_THREAD_FPEMU_SIGFPE)
  57
  58
  59/*
  60 * This shift should be large enough to be able to represent 1000000000/itc_freq with good
  61 * accuracy while being small enough to fit 10*1000000000<<IA64_NSEC_PER_CYC_SHIFT in 64 bits
  62 * (this will give enough slack to represent 10 seconds worth of time as a scaled number).
  63 */
  64#define IA64_NSEC_PER_CYC_SHIFT 30
  65
  66#ifndef __ASSEMBLY__
  67
  68#include <linux/cache.h>
  69#include <linux/compiler.h>
  70#include <linux/threads.h>
  71#include <linux/types.h>
  72
  73#include <asm/fpu.h>
  74#include <asm/page.h>
  75#include <asm/percpu.h>
  76#include <asm/rse.h>
  77#include <asm/unwind.h>
  78#include <asm/atomic.h>
  79#ifdef CONFIG_NUMA
  80#include <asm/nodedata.h>
  81#endif
  82
  83/* like above but expressed as bitfields for more efficient access: */
  84struct ia64_psr {
  85        __u64 reserved0 : 1;
  86        __u64 be : 1;
  87        __u64 up : 1;
  88        __u64 ac : 1;
  89        __u64 mfl : 1;
  90        __u64 mfh : 1;
  91        __u64 reserved1 : 7;
  92        __u64 ic : 1;
  93        __u64 i : 1;
  94        __u64 pk : 1;
  95        __u64 reserved2 : 1;
  96        __u64 dt : 1;
  97        __u64 dfl : 1;
  98        __u64 dfh : 1;
  99        __u64 sp : 1;
 100        __u64 pp : 1;
 101        __u64 di : 1;
 102        __u64 si : 1;
 103        __u64 db : 1;
 104        __u64 lp : 1;
 105        __u64 tb : 1;
 106        __u64 rt : 1;
 107        __u64 reserved3 : 4;
 108        __u64 cpl : 2;
 109        __u64 is : 1;
 110        __u64 mc : 1;
 111        __u64 it : 1;
 112        __u64 id : 1;
 113        __u64 da : 1;
 114        __u64 dd : 1;
 115        __u64 ss : 1;
 116        __u64 ri : 2;
 117        __u64 ed : 1;
 118        __u64 bn : 1;
 119        __u64 reserved4 : 19;
 120};
 121
 122union ia64_isr {
 123        __u64  val;
 124        struct {
 125                __u64 code : 16;
 126                __u64 vector : 8;
 127                __u64 reserved1 : 8;
 128                __u64 x : 1;
 129                __u64 w : 1;
 130                __u64 r : 1;
 131                __u64 na : 1;
 132                __u64 sp : 1;
 133                __u64 rs : 1;
 134                __u64 ir : 1;
 135                __u64 ni : 1;
 136                __u64 so : 1;
 137                __u64 ei : 2;
 138                __u64 ed : 1;
 139                __u64 reserved2 : 20;
 140        };
 141};
 142
 143union ia64_lid {
 144        __u64 val;
 145        struct {
 146                __u64  rv  : 16;
 147                __u64  eid : 8;
 148                __u64  id  : 8;
 149                __u64  ig  : 32;
 150        };
 151};
 152
 153union ia64_tpr {
 154        __u64 val;
 155        struct {
 156                __u64 ig0 : 4;
 157                __u64 mic : 4;
 158                __u64 rsv : 8;
 159                __u64 mmi : 1;
 160                __u64 ig1 : 47;
 161        };
 162};
 163
 164union ia64_itir {
 165        __u64 val;
 166        struct {
 167                __u64 rv3  :  2; /* 0-1 */
 168                __u64 ps   :  6; /* 2-7 */
 169                __u64 key  : 24; /* 8-31 */
 170                __u64 rv4  : 32; /* 32-63 */
 171        };
 172};
 173
 174union  ia64_rr {
 175        __u64 val;
 176        struct {
 177                __u64  ve       :  1;  /* enable hw walker */
 178                __u64  reserved0:  1;  /* reserved */
 179                __u64  ps       :  6;  /* log page size */
 180                __u64  rid      : 24;  /* region id */
 181                __u64  reserved1: 32;  /* reserved */
 182        };
 183};
 184
 185/*
 186 * CPU type, hardware bug flags, and per-CPU state.  Frequently used
 187 * state comes earlier:
 188 */
 189struct cpuinfo_ia64 {
 190        unsigned int softirq_pending;
 191        unsigned long itm_delta;        /* # of clock cycles between clock ticks */
 192        unsigned long itm_next;         /* interval timer mask value to use for next clock tick */
 193        unsigned long nsec_per_cyc;     /* (1000000000<<IA64_NSEC_PER_CYC_SHIFT)/itc_freq */
 194        unsigned long unimpl_va_mask;   /* mask of unimplemented virtual address bits (from PAL) */
 195        unsigned long unimpl_pa_mask;   /* mask of unimplemented physical address bits (from PAL) */
 196        unsigned long itc_freq;         /* frequency of ITC counter */
 197        unsigned long proc_freq;        /* frequency of processor */
 198        unsigned long cyc_per_usec;     /* itc_freq/1000000 */
 199        unsigned long ptce_base;
 200        unsigned int ptce_count[2];
 201        unsigned int ptce_stride[2];
 202        struct task_struct *ksoftirqd;  /* kernel softirq daemon for this CPU */
 203
 204#ifdef CONFIG_SMP
 205        unsigned long loops_per_jiffy;
 206        int cpu;
 207        unsigned int socket_id; /* physical processor socket id */
 208        unsigned short core_id; /* core id */
 209        unsigned short thread_id; /* thread id */
 210        unsigned short num_log; /* Total number of logical processors on
 211                                 * this socket that were successfully booted */
 212        unsigned char cores_per_socket; /* Cores per processor socket */
 213        unsigned char threads_per_core; /* Threads per core */
 214#endif
 215
 216        /* CPUID-derived information: */
 217        unsigned long ppn;
 218        unsigned long features;
 219        unsigned char number;
 220        unsigned char revision;
 221        unsigned char model;
 222        unsigned char family;
 223        unsigned char archrev;
 224        char vendor[16];
 225        char *model_name;
 226
 227#ifdef CONFIG_NUMA
 228        struct ia64_node_data *node_data;
 229#endif
 230};
 231
 232DECLARE_PER_CPU(struct cpuinfo_ia64, ia64_cpu_info);
 233
 234/*
 235 * The "local" data variable.  It refers to the per-CPU data of the currently executing
 236 * CPU, much like "current" points to the per-task data of the currently executing task.
 237 * Do not use the address of local_cpu_data, since it will be different from
 238 * cpu_data(smp_processor_id())!
 239 */
 240#define local_cpu_data          (&__ia64_per_cpu_var(ia64_cpu_info))
 241#define cpu_data(cpu)           (&per_cpu(ia64_cpu_info, cpu))
 242
 243extern void print_cpu_info (struct cpuinfo_ia64 *);
 244
 245typedef struct {
 246        unsigned long seg;
 247} mm_segment_t;
 248
 249#define SET_UNALIGN_CTL(task,value)                                                             \
 250({                                                                                              \
 251        (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_UAC_MASK)                  \
 252                                | (((value) << IA64_THREAD_UAC_SHIFT) & IA64_THREAD_UAC_MASK)); \
 253        0;                                                                                      \
 254})
 255#define GET_UNALIGN_CTL(task,addr)                                                              \
 256({                                                                                              \
 257        put_user(((task)->thread.flags & IA64_THREAD_UAC_MASK) >> IA64_THREAD_UAC_SHIFT,        \
 258                 (int __user *) (addr));                                                        \
 259})
 260
 261#define SET_FPEMU_CTL(task,value)                                                               \
 262({                                                                                              \
 263        (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_FPEMU_MASK)                \
 264                          | (((value) << IA64_THREAD_FPEMU_SHIFT) & IA64_THREAD_FPEMU_MASK));   \
 265        0;                                                                                      \
 266})
 267#define GET_FPEMU_CTL(task,addr)                                                                \
 268({                                                                                              \
 269        put_user(((task)->thread.flags & IA64_THREAD_FPEMU_MASK) >> IA64_THREAD_FPEMU_SHIFT,    \
 270                 (int __user *) (addr));                                                        \
 271})
 272
 273struct thread_struct {
 274        __u32 flags;                    /* various thread flags (see IA64_THREAD_*) */
 275        /* writing on_ustack is performance-critical, so it's worth spending 8 bits on it... */
 276        __u8 on_ustack;                 /* executing on user-stacks? */
 277        __u8 pad[3];
 278        __u64 ksp;                      /* kernel stack pointer */
 279        __u64 map_base;                 /* base address for get_unmapped_area() */
 280        __u64 task_size;                /* limit for task size */
 281        __u64 rbs_bot;                  /* the base address for the RBS */
 282        int last_fph_cpu;               /* CPU that may hold the contents of f32-f127 */
 283
 284#ifdef CONFIG_PERFMON
 285        void *pfm_context;                   /* pointer to detailed PMU context */
 286        unsigned long pfm_needs_checking;    /* when >0, pending perfmon work on kernel exit */
 287# define INIT_THREAD_PM         .pfm_context =          NULL,     \
 288                                .pfm_needs_checking =   0UL,
 289#else
 290# define INIT_THREAD_PM
 291#endif
 292        unsigned long dbr[IA64_NUM_DBG_REGS];
 293        unsigned long ibr[IA64_NUM_DBG_REGS];
 294        struct ia64_fpreg fph[96];      /* saved/loaded on demand */
 295};
 296
 297#define INIT_THREAD {                                           \
 298        .flags =        0,                                      \
 299        .on_ustack =    0,                                      \
 300        .ksp =          0,                                      \
 301        .map_base =     DEFAULT_MAP_BASE,                       \
 302        .rbs_bot =      STACK_TOP - DEFAULT_USER_STACK_SIZE,    \
 303        .task_size =    DEFAULT_TASK_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        set_fs(USER_DS);                                                                        \
 313        regs->cr_ipsr = ((regs->cr_ipsr | (IA64_PSR_BITS_TO_SET | IA64_PSR_CPL))                \
 314                         & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_RI | IA64_PSR_IS));              \
 315        regs->cr_iip = new_ip;                                                                  \
 316        regs->ar_rsc = 0xf;             /* eager mode, privilege level 3 */                     \
 317        regs->ar_rnat = 0;                                                                      \
 318        regs->ar_bspstore = current->thread.rbs_bot;                                            \
 319        regs->ar_fpsr = FPSR_DEFAULT;                                                           \
 320        regs->loadrs = 0;                                                                       \
 321        regs->r8 = get_dumpable(current->mm);   /* set "don't zap registers" flag */            \
 322        regs->r12 = new_sp - 16;        /* allocate 16 byte scratch area */                     \
 323        if (unlikely(!get_dumpable(current->mm))) {                                                     \
 324                /*                                                                              \
 325                 * Zap scratch regs to avoid leaking bits between processes with different      \
 326                 * uid/privileges.                                                              \
 327                 */                                                                             \
 328                regs->ar_pfs = 0; regs->b0 = 0; regs->pr = 0;                                   \
 329                regs->r1 = 0; regs->r9  = 0; regs->r11 = 0; regs->r13 = 0; regs->r15 = 0;       \
 330        }                                                                                       \
 331} while (0)
 332
 333/* Forward declarations, a strange C thing... */
 334struct mm_struct;
 335struct task_struct;
 336
 337/*
 338 * Free all resources held by a thread. This is called after the
 339 * parent of DEAD_TASK has collected the exit status of the task via
 340 * wait().
 341 */
 342#define release_thread(dead_task)
 343
 344/* Prepare to copy thread state - unlazy all lazy status */
 345#define prepare_to_copy(tsk)    do { } while (0)
 346
 347/*
 348 * This is the mechanism for creating a new kernel thread.
 349 *
 350 * NOTE 1: Only a kernel-only process (ie the swapper or direct
 351 * descendants who haven't done an "execve()") should use this: it
 352 * will work within a system call from a "real" process, but the
 353 * process memory space will not be free'd until both the parent and
 354 * the child have exited.
 355 *
 356 * NOTE 2: This MUST NOT be an inlined function.  Otherwise, we get
 357 * into trouble in init/main.c when the child thread returns to
 358 * do_basic_setup() and the timing is such that free_initmem() has
 359 * been called already.
 360 */
 361extern pid_t kernel_thread (int (*fn)(void *), void *arg, unsigned long flags);
 362
 363/* Get wait channel for task P.  */
 364extern unsigned long get_wchan (struct task_struct *p);
 365
 366/* Return instruction pointer of blocked task TSK.  */
 367#define KSTK_EIP(tsk)                                   \
 368  ({                                                    \
 369        struct pt_regs *_regs = task_pt_regs(tsk);      \
 370        _regs->cr_iip + ia64_psr(_regs)->ri;            \
 371  })
 372
 373/* Return stack pointer of blocked task TSK.  */
 374#define KSTK_ESP(tsk)  ((tsk)->thread.ksp)
 375
 376extern void ia64_getreg_unknown_kr (void);
 377extern void ia64_setreg_unknown_kr (void);
 378
 379#define ia64_get_kr(regnum)                                     \
 380({                                                              \
 381        unsigned long r = 0;                                    \
 382                                                                \
 383        switch (regnum) {                                       \
 384            case 0: r = ia64_getreg(_IA64_REG_AR_KR0); break;   \
 385            case 1: r = ia64_getreg(_IA64_REG_AR_KR1); break;   \
 386            case 2: r = ia64_getreg(_IA64_REG_AR_KR2); break;   \
 387            case 3: r = ia64_getreg(_IA64_REG_AR_KR3); break;   \
 388            case 4: r = ia64_getreg(_IA64_REG_AR_KR4); break;   \
 389            case 5: r = ia64_getreg(_IA64_REG_AR_KR5); break;   \
 390            case 6: r = ia64_getreg(_IA64_REG_AR_KR6); break;   \
 391            case 7: r = ia64_getreg(_IA64_REG_AR_KR7); break;   \
 392            default: ia64_getreg_unknown_kr(); break;           \
 393        }                                                       \
 394        r;                                                      \
 395})
 396
 397#define ia64_set_kr(regnum, r)                                  \
 398({                                                              \
 399        switch (regnum) {                                       \
 400            case 0: ia64_setreg(_IA64_REG_AR_KR0, r); break;    \
 401            case 1: ia64_setreg(_IA64_REG_AR_KR1, r); break;    \
 402            case 2: ia64_setreg(_IA64_REG_AR_KR2, r); break;    \
 403            case 3: ia64_setreg(_IA64_REG_AR_KR3, r); break;    \
 404            case 4: ia64_setreg(_IA64_REG_AR_KR4, r); break;    \
 405            case 5: ia64_setreg(_IA64_REG_AR_KR5, r); break;    \
 406            case 6: ia64_setreg(_IA64_REG_AR_KR6, r); break;    \
 407            case 7: ia64_setreg(_IA64_REG_AR_KR7, r); break;    \
 408            default: ia64_setreg_unknown_kr(); break;           \
 409        }                                                       \
 410})
 411
 412/*
 413 * The following three macros can't be inline functions because we don't have struct
 414 * task_struct at this point.
 415 */
 416
 417/*
 418 * Return TRUE if task T owns the fph partition of the CPU we're running on.
 419 * Must be called from code that has preemption disabled.
 420 */
 421#define ia64_is_local_fpu_owner(t)                                                              \
 422({                                                                                              \
 423        struct task_struct *__ia64_islfo_task = (t);                                            \
 424        (__ia64_islfo_task->thread.last_fph_cpu == smp_processor_id()                           \
 425         && __ia64_islfo_task == (struct task_struct *) ia64_get_kr(IA64_KR_FPU_OWNER));        \
 426})
 427
 428/*
 429 * Mark task T as owning the fph partition of the CPU we're running on.
 430 * Must be called from code that has preemption disabled.
 431 */
 432#define ia64_set_local_fpu_owner(t) do {                                                \
 433        struct task_struct *__ia64_slfo_task = (t);                                     \
 434        __ia64_slfo_task->thread.last_fph_cpu = smp_processor_id();                     \
 435        ia64_set_kr(IA64_KR_FPU_OWNER, (unsigned long) __ia64_slfo_task);               \
 436} while (0)
 437
 438/* Mark the fph partition of task T as being invalid on all CPUs.  */
 439#define ia64_drop_fpu(t)        ((t)->thread.last_fph_cpu = -1)
 440
 441extern void __ia64_init_fpu (void);
 442extern void __ia64_save_fpu (struct ia64_fpreg *fph);
 443extern void __ia64_load_fpu (struct ia64_fpreg *fph);
 444extern void ia64_save_debug_regs (unsigned long *save_area);
 445extern void ia64_load_debug_regs (unsigned long *save_area);
 446
 447#define ia64_fph_enable()       do { ia64_rsm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
 448#define ia64_fph_disable()      do { ia64_ssm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
 449
 450/* load fp 0.0 into fph */
 451static inline void
 452ia64_init_fpu (void) {
 453        ia64_fph_enable();
 454        __ia64_init_fpu();
 455        ia64_fph_disable();
 456}
 457
 458/* save f32-f127 at FPH */
 459static inline void
 460ia64_save_fpu (struct ia64_fpreg *fph) {
 461        ia64_fph_enable();
 462        __ia64_save_fpu(fph);
 463        ia64_fph_disable();
 464}
 465
 466/* load f32-f127 from FPH */
 467static inline void
 468ia64_load_fpu (struct ia64_fpreg *fph) {
 469        ia64_fph_enable();
 470        __ia64_load_fpu(fph);
 471        ia64_fph_disable();
 472}
 473
 474static inline __u64
 475ia64_clear_ic (void)
 476{
 477        __u64 psr;
 478        psr = ia64_getreg(_IA64_REG_PSR);
 479        ia64_stop();
 480        ia64_rsm(IA64_PSR_I | IA64_PSR_IC);
 481        ia64_srlz_i();
 482        return psr;
 483}
 484
 485/*
 486 * Restore the psr.
 487 */
 488static inline void
 489ia64_set_psr (__u64 psr)
 490{
 491        ia64_stop();
 492        ia64_setreg(_IA64_REG_PSR_L, psr);
 493        ia64_srlz_i();
 494}
 495
 496/*
 497 * Insert a translation into an instruction and/or data translation
 498 * register.
 499 */
 500static inline void
 501ia64_itr (__u64 target_mask, __u64 tr_num,
 502          __u64 vmaddr, __u64 pte,
 503          __u64 log_page_size)
 504{
 505        ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
 506        ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
 507        ia64_stop();
 508        if (target_mask & 0x1)
 509                ia64_itri(tr_num, pte);
 510        if (target_mask & 0x2)
 511                ia64_itrd(tr_num, pte);
 512}
 513
 514/*
 515 * Insert a translation into the instruction and/or data translation
 516 * cache.
 517 */
 518static inline void
 519ia64_itc (__u64 target_mask, __u64 vmaddr, __u64 pte,
 520          __u64 log_page_size)
 521{
 522        ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
 523        ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
 524        ia64_stop();
 525        /* as per EAS2.6, itc must be the last instruction in an instruction group */
 526        if (target_mask & 0x1)
 527                ia64_itci(pte);
 528        if (target_mask & 0x2)
 529                ia64_itcd(pte);
 530}
 531
 532/*
 533 * Purge a range of addresses from instruction and/or data translation
 534 * register(s).
 535 */
 536static inline void
 537ia64_ptr (__u64 target_mask, __u64 vmaddr, __u64 log_size)
 538{
 539        if (target_mask & 0x1)
 540                ia64_ptri(vmaddr, (log_size << 2));
 541        if (target_mask & 0x2)
 542                ia64_ptrd(vmaddr, (log_size << 2));
 543}
 544
 545/* Set the interrupt vector address.  The address must be suitably aligned (32KB).  */
 546static inline void
 547ia64_set_iva (void *ivt_addr)
 548{
 549        ia64_setreg(_IA64_REG_CR_IVA, (__u64) ivt_addr);
 550        ia64_srlz_i();
 551}
 552
 553/* Set the page table address and control bits.  */
 554static inline void
 555ia64_set_pta (__u64 pta)
 556{
 557        /* Note: srlz.i implies srlz.d */
 558        ia64_setreg(_IA64_REG_CR_PTA, pta);
 559        ia64_srlz_i();
 560}
 561
 562static inline void
 563ia64_eoi (void)
 564{
 565        ia64_setreg(_IA64_REG_CR_EOI, 0);
 566        ia64_srlz_d();
 567}
 568
 569#define cpu_relax()     ia64_hint(ia64_hint_pause)
 570
 571static inline int
 572ia64_get_irr(unsigned int vector)
 573{
 574        unsigned int reg = vector / 64;
 575        unsigned int bit = vector % 64;
 576        u64 irr;
 577
 578        switch (reg) {
 579        case 0: irr = ia64_getreg(_IA64_REG_CR_IRR0); break;
 580        case 1: irr = ia64_getreg(_IA64_REG_CR_IRR1); break;
 581        case 2: irr = ia64_getreg(_IA64_REG_CR_IRR2); break;
 582        case 3: irr = ia64_getreg(_IA64_REG_CR_IRR3); break;
 583        }
 584
 585        return test_bit(bit, &irr);
 586}
 587
 588static inline void
 589ia64_set_lrr0 (unsigned long val)
 590{
 591        ia64_setreg(_IA64_REG_CR_LRR0, val);
 592        ia64_srlz_d();
 593}
 594
 595static inline void
 596ia64_set_lrr1 (unsigned long val)
 597{
 598        ia64_setreg(_IA64_REG_CR_LRR1, val);
 599        ia64_srlz_d();
 600}
 601
 602
 603/*
 604 * Given the address to which a spill occurred, return the unat bit
 605 * number that corresponds to this address.
 606 */
 607static inline __u64
 608ia64_unat_pos (void *spill_addr)
 609{
 610        return ((__u64) spill_addr >> 3) & 0x3f;
 611}
 612
 613/*
 614 * Set the NaT bit of an integer register which was spilled at address
 615 * SPILL_ADDR.  UNAT is the mask to be updated.
 616 */
 617static inline void
 618ia64_set_unat (__u64 *unat, void *spill_addr, unsigned long nat)
 619{
 620        __u64 bit = ia64_unat_pos(spill_addr);
 621        __u64 mask = 1UL << bit;
 622
 623        *unat = (*unat & ~mask) | (nat << bit);
 624}
 625
 626/*
 627 * Return saved PC of a blocked thread.
 628 * Note that the only way T can block is through a call to schedule() -> switch_to().
 629 */
 630static inline unsigned long
 631thread_saved_pc (struct task_struct *t)
 632{
 633        struct unw_frame_info info;
 634        unsigned long ip;
 635
 636        unw_init_from_blocked_task(&info, t);
 637        if (unw_unwind(&info) < 0)
 638                return 0;
 639        unw_get_ip(&info, &ip);
 640        return ip;
 641}
 642
 643/*
 644 * Get the current instruction/program counter value.
 645 */
 646#define current_text_addr() \
 647        ({ void *_pc; _pc = (void *)ia64_getreg(_IA64_REG_IP); _pc; })
 648
 649static inline __u64
 650ia64_get_ivr (void)
 651{
 652        __u64 r;
 653        ia64_srlz_d();
 654        r = ia64_getreg(_IA64_REG_CR_IVR);
 655        ia64_srlz_d();
 656        return r;
 657}
 658
 659static inline void
 660ia64_set_dbr (__u64 regnum, __u64 value)
 661{
 662        __ia64_set_dbr(regnum, value);
 663#ifdef CONFIG_ITANIUM
 664        ia64_srlz_d();
 665#endif
 666}
 667
 668static inline __u64
 669ia64_get_dbr (__u64 regnum)
 670{
 671        __u64 retval;
 672
 673        retval = __ia64_get_dbr(regnum);
 674#ifdef CONFIG_ITANIUM
 675        ia64_srlz_d();
 676#endif
 677        return retval;
 678}
 679
 680static inline __u64
 681ia64_rotr (__u64 w, __u64 n)
 682{
 683        return (w >> n) | (w << (64 - n));
 684}
 685
 686#define ia64_rotl(w,n)  ia64_rotr((w), (64) - (n))
 687
 688/*
 689 * Take a mapped kernel address and return the equivalent address
 690 * in the region 7 identity mapped virtual area.
 691 */
 692static inline void *
 693ia64_imva (void *addr)
 694{
 695        void *result;
 696        result = (void *) ia64_tpa(addr);
 697        return __va(result);
 698}
 699
 700#define ARCH_HAS_PREFETCH
 701#define ARCH_HAS_PREFETCHW
 702#define ARCH_HAS_SPINLOCK_PREFETCH
 703#define PREFETCH_STRIDE                 L1_CACHE_BYTES
 704
 705static inline void
 706prefetch (const void *x)
 707{
 708         ia64_lfetch(ia64_lfhint_none, x);
 709}
 710
 711static inline void
 712prefetchw (const void *x)
 713{
 714        ia64_lfetch_excl(ia64_lfhint_none, x);
 715}
 716
 717#define spin_lock_prefetch(x)   prefetchw(x)
 718
 719extern unsigned long boot_option_idle_override;
 720
 721enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_FORCE_MWAIT,
 722                         IDLE_NOMWAIT, IDLE_POLL};
 723
 724#endif /* !__ASSEMBLY__ */
 725
 726#endif /* _ASM_IA64_PROCESSOR_H */
 727