arch/ia64/include/asm/processor.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_IA64_PROCESSOR_H
   3 #define _ASM_IA64_PROCESSOR_H
   4
   5 /*
   6  * Copyright (C) 1998-2004 Hewlett-Packard Co
   7  *      David Mosberger-Tang <davidm@hpl.hp.com>
   8  *      Stephane Eranian <eranian@hpl.hp.com>
   9  * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
  10  * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
  11  *
  12  * 11/24/98     S.Eranian       added ia64_set_iva()
  13  * 12/03/99     D. Mosberger    implement thread_saved_pc() via kernel unwind API
  14  * 06/16/00     A. Mallick      added csd/ssd/tssd for ia32 support
  15  */
  16
  17
  18 #include <asm/intrinsics.h>
  19 #include <asm/kregs.h>
  20 #include <asm/ptrace.h>
  21 #include <asm/ustack.h>
  22
  23 #define IA64_NUM_PHYS_STACK_REG 96
  24 #define IA64_NUM_DBG_REGS       8
  25
  26 #define DEFAULT_MAP_BASE        __IA64_UL_CONST(0x2000000000000000)
  27 #define DEFAULT_TASK_SIZE       __IA64_UL_CONST(0xa000000000000000)
  28
  29 /*
  30  * TASK_SIZE really is a mis-named.  It really is the maximum user
  31  * space address (plus one).  On IA-64, there are five regions of 2TB
  32  * each (assuming 8KB page size), for a total of 8TB of user virtual
  33  * address space.
  34  */
  35 #define TASK_SIZE               DEFAULT_TASK_SIZE
  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 #include <linux/bitops.h>
  73
  74 #include <asm/fpu.h>
  75 #include <asm/page.h>
  76 #include <asm/percpu.h>
  77 #include <asm/rse.h>
  78 #include <asm/unwind.h>
  79 #include <linux/atomic.h>
  80 #ifdef CONFIG_NUMA
  81 #include <asm/nodedata.h>
  82 #endif
  83
  84 /* like above but expressed as bitfields for more efficient access: */
  85 struct ia64_psr {
  86         __u64 reserved0 : 1;
  87         __u64 be : 1;
  88         __u64 up : 1;
  89         __u64 ac : 1;
  90         __u64 mfl : 1;
  91         __u64 mfh : 1;
  92         __u64 reserved1 : 7;
  93         __u64 ic : 1;
  94         __u64 i : 1;
  95         __u64 pk : 1;
  96         __u64 reserved2 : 1;
  97         __u64 dt : 1;
  98         __u64 dfl : 1;
  99         __u64 dfh : 1;
 100         __u64 sp : 1;
 101         __u64 pp : 1;
 102         __u64 di : 1;
 103         __u64 si : 1;
 104         __u64 db : 1;
 105         __u64 lp : 1;
 106         __u64 tb : 1;
 107         __u64 rt : 1;
 108         __u64 reserved3 : 4;
 109         __u64 cpl : 2;
 110         __u64 is : 1;
 111         __u64 mc : 1;
 112         __u64 it : 1;
 113         __u64 id : 1;
 114         __u64 da : 1;
 115         __u64 dd : 1;
 116         __u64 ss : 1;
 117         __u64 ri : 2;
 118         __u64 ed : 1;
 119         __u64 bn : 1;
 120         __u64 reserved4 : 19;
 121 };
 122
 123 union ia64_isr {
 124         __u64  val;
 125         struct {
 126                 __u64 code : 16;
 127                 __u64 vector : 8;
 128                 __u64 reserved1 : 8;
 129                 __u64 x : 1;
 130                 __u64 w : 1;
 131                 __u64 r : 1;
 132                 __u64 na : 1;
 133                 __u64 sp : 1;
 134                 __u64 rs : 1;
 135                 __u64 ir : 1;
 136                 __u64 ni : 1;
 137                 __u64 so : 1;
 138                 __u64 ei : 2;
 139                 __u64 ed : 1;
 140                 __u64 reserved2 : 20;
 141         };
 142 };
 143
 144 union ia64_lid {
 145         __u64 val;
 146         struct {
 147                 __u64  rv  : 16;
 148                 __u64  eid : 8;
 149                 __u64  id  : 8;
 150                 __u64  ig  : 32;
 151         };
 152 };
 153
 154 union ia64_tpr {
 155         __u64 val;
 156         struct {
 157                 __u64 ig0 : 4;
 158                 __u64 mic : 4;
 159                 __u64 rsv : 8;
 160                 __u64 mmi : 1;
 161                 __u64 ig1 : 47;
 162         };
 163 };
 164
 165 union ia64_itir {
 166         __u64 val;
 167         struct {
 168                 __u64 rv3  :  2; /* 0-1 */
 169                 __u64 ps   :  6; /* 2-7 */
 170                 __u64 key  : 24; /* 8-31 */
 171                 __u64 rv4  : 32; /* 32-63 */
 172         };
 173 };
 174
 175 union  ia64_rr {
 176         __u64 val;
 177         struct {
 178                 __u64  ve       :  1;  /* enable hw walker */
 179                 __u64  reserved0:  1;  /* reserved */
 180                 __u64  ps       :  6;  /* log page size */
 181                 __u64  rid      : 24;  /* region id */
 182                 __u64  reserved1: 32;  /* reserved */
 183         };
 184 };
 185
 186 /*
 187  * CPU type, hardware bug flags, and per-CPU state.  Frequently used
 188  * state comes earlier:
 189  */
 190 struct cpuinfo_ia64 {
 191         unsigned int softirq_pending;
 192         unsigned long itm_delta;        /* # of clock cycles between clock ticks */
 193         unsigned long itm_next;         /* interval timer mask value to use for next clock tick */
 194         unsigned long nsec_per_cyc;     /* (1000000000<<IA64_NSEC_PER_CYC_SHIFT)/itc_freq */
 195         unsigned long unimpl_va_mask;   /* mask of unimplemented virtual address bits (from PAL) */
 196         unsigned long unimpl_pa_mask;   /* mask of unimplemented physical address bits (from PAL) */
 197         unsigned long itc_freq;         /* frequency of ITC counter */
 198         unsigned long proc_freq;        /* frequency of processor */
 199         unsigned long cyc_per_usec;     /* itc_freq/1000000 */
 200         unsigned long ptce_base;
 201         unsigned int ptce_count[2];
 202         unsigned int ptce_stride[2];
 203         struct task_struct *ksoftirqd;  /* kernel softirq daemon for this CPU */
 204
 205 #ifdef CONFIG_SMP
 206         unsigned long loops_per_jiffy;
 207         int cpu;
 208         unsigned int socket_id; /* physical processor socket id */
 209         unsigned short core_id; /* core id */
 210         unsigned short thread_id; /* thread id */
 211         unsigned short num_log; /* Total number of logical processors on
 212                                  * this socket that were successfully booted */
 213         unsigned char cores_per_socket; /* Cores per processor socket */
 214         unsigned char threads_per_core; /* Threads per core */
 215 #endif
 216
 217         /* CPUID-derived information: */
 218         unsigned long ppn;
 219         unsigned long features;
 220         unsigned char number;
 221         unsigned char revision;
 222         unsigned char model;
 223         unsigned char family;
 224         unsigned char archrev;
 225         char vendor[16];
 226         char *model_name;
 227
 228 #ifdef CONFIG_NUMA
 229         struct ia64_node_data *node_data;
 230 #endif
 231 };
 232
 233 DECLARE_PER_CPU(struct cpuinfo_ia64, ia64_cpu_info);
 234
 235 /*
 236  * The "local" data variable.  It refers to the per-CPU data of the currently executing
 237  * CPU, much like "current" points to the per-task data of the currently executing task.
 238  * Do not use the address of local_cpu_data, since it will be different from
 239  * cpu_data(smp_processor_id())!
 240  */
 241 #define local_cpu_data          (&__ia64_per_cpu_var(ia64_cpu_info))
 242 #define cpu_data(cpu)           (&per_cpu(ia64_cpu_info, cpu))
 243
 244 extern void print_cpu_info (struct cpuinfo_ia64 *);
 245
 246 #define SET_UNALIGN_CTL(task,value)                                                             \
 247 ({                                                                                              \
 248         (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_UAC_MASK)                  \
 249                                 | (((value) << IA64_THREAD_UAC_SHIFT) & IA64_THREAD_UAC_MASK)); \
 250         0;                                                                                      \
 251 })
 252 #define GET_UNALIGN_CTL(task,addr)                                                              \
 253 ({                                                                                              \
 254         put_user(((task)->thread.flags & IA64_THREAD_UAC_MASK) >> IA64_THREAD_UAC_SHIFT,        \
 255                  (int __user *) (addr));                                                        \
 256 })
 257
 258 #define SET_FPEMU_CTL(task,value)                                                               \
 259 ({                                                                                              \
 260         (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_FPEMU_MASK)                \
 261                           | (((value) << IA64_THREAD_FPEMU_SHIFT) & IA64_THREAD_FPEMU_MASK));   \
 262         0;                                                                                      \
 263 })
 264 #define GET_FPEMU_CTL(task,addr)                                                                \
 265 ({                                                                                              \
 266         put_user(((task)->thread.flags & IA64_THREAD_FPEMU_MASK) >> IA64_THREAD_FPEMU_SHIFT,    \
 267                  (int __user *) (addr));                                                        \
 268 })
 269
 270 struct thread_struct {
 271         __u32 flags;                    /* various thread flags (see IA64_THREAD_*) */
 272         /* writing on_ustack is performance-critical, so it's worth spending 8 bits on it... */
 273         __u8 on_ustack;                 /* executing on user-stacks? */
 274         __u8 pad[3];
 275         __u64 ksp;                      /* kernel stack pointer */
 276         __u64 map_base;                 /* base address for get_unmapped_area() */
 277         __u64 rbs_bot;                  /* the base address for the RBS */
 278         int last_fph_cpu;               /* CPU that may hold the contents of f32-f127 */
 279         unsigned long dbr[IA64_NUM_DBG_REGS];
 280         unsigned long ibr[IA64_NUM_DBG_REGS];
 281         struct ia64_fpreg fph[96];      /* saved/loaded on demand */
 282 };
 283
 284 #define INIT_THREAD {                                           \
 285         .flags =        0,                                      \
 286         .on_ustack =    0,                                      \
 287         .ksp =          0,                                      \
 288         .map_base =     DEFAULT_MAP_BASE,                       \
 289         .rbs_bot =      STACK_TOP - DEFAULT_USER_STACK_SIZE,    \
 290         .last_fph_cpu =  -1,                                    \
 291         .dbr =          {0, },                                  \
 292         .ibr =          {0, },                                  \
 293         .fph =          {{{{0}}}, }                             \
 294 }
 295
 296 #define start_thread(regs,new_ip,new_sp) do {                                                   \
 297         regs->cr_ipsr = ((regs->cr_ipsr | (IA64_PSR_BITS_TO_SET | IA64_PSR_CPL))                \
 298                          & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_RI | IA64_PSR_IS));              \
 299         regs->cr_iip = new_ip;                                                                  \
 300         regs->ar_rsc = 0xf;             /* eager mode, privilege level 3 */                     \
 301         regs->ar_rnat = 0;                                                                      \
 302         regs->ar_bspstore = current->thread.rbs_bot;                                            \
 303         regs->ar_fpsr = FPSR_DEFAULT;                                                           \
 304         regs->loadrs = 0;                                                                       \
 305         regs->r8 = get_dumpable(current->mm);   /* set "don't zap registers" flag */            \
 306         regs->r12 = new_sp - 16;        /* allocate 16 byte scratch area */                     \
 307         if (unlikely(get_dumpable(current->mm) != SUID_DUMP_USER)) {    \
 308                 /*                                                                              \
 309                  * Zap scratch regs to avoid leaking bits between processes with different      \
 310                  * uid/privileges.                                                              \
 311                  */                                                                             \
 312                 regs->ar_pfs = 0; regs->b0 = 0; regs->pr = 0;                                   \
 313                 regs->r1 = 0; regs->r9  = 0; regs->r11 = 0; regs->r13 = 0; regs->r15 = 0;       \
 314         }                                                                                       \
 315 } while (0)
 316
 317 /* Forward declarations, a strange C thing... */
 318 struct mm_struct;
 319 struct task_struct;
 320
 321 /* Get wait channel for task P.  */
 322 extern unsigned long __get_wchan (struct task_struct *p);
 323
 324 /* Return instruction pointer of blocked task TSK.  */
 325 #define KSTK_EIP(tsk)                                   \
 326   ({                                                    \
 327         struct pt_regs *_regs = task_pt_regs(tsk);      \
 328         _regs->cr_iip + ia64_psr(_regs)->ri;            \
 329   })
 330
 331 /* Return stack pointer of blocked task TSK.  */
 332 #define KSTK_ESP(tsk)  ((tsk)->thread.ksp)
 333
 334 extern void ia64_getreg_unknown_kr (void);
 335 extern void ia64_setreg_unknown_kr (void);
 336
 337 #define ia64_get_kr(regnum)                                     \
 338 ({                                                              \
 339         unsigned long r = 0;                                    \
 340                                                                 \
 341         switch (regnum) {                                       \
 342             case 0: r = ia64_getreg(_IA64_REG_AR_KR0); break;   \
 343             case 1: r = ia64_getreg(_IA64_REG_AR_KR1); break;   \
 344             case 2: r = ia64_getreg(_IA64_REG_AR_KR2); break;   \
 345             case 3: r = ia64_getreg(_IA64_REG_AR_KR3); break;   \
 346             case 4: r = ia64_getreg(_IA64_REG_AR_KR4); break;   \
 347             case 5: r = ia64_getreg(_IA64_REG_AR_KR5); break;   \
 348             case 6: r = ia64_getreg(_IA64_REG_AR_KR6); break;   \
 349             case 7: r = ia64_getreg(_IA64_REG_AR_KR7); break;   \
 350             default: ia64_getreg_unknown_kr(); break;           \
 351         }                                                       \
 352         r;                                                      \
 353 })
 354
 355 #define ia64_set_kr(regnum, r)                                  \
 356 ({                                                              \
 357         switch (regnum) {                                       \
 358             case 0: ia64_setreg(_IA64_REG_AR_KR0, r); break;    \
 359             case 1: ia64_setreg(_IA64_REG_AR_KR1, r); break;    \
 360             case 2: ia64_setreg(_IA64_REG_AR_KR2, r); break;    \
 361             case 3: ia64_setreg(_IA64_REG_AR_KR3, r); break;    \
 362             case 4: ia64_setreg(_IA64_REG_AR_KR4, r); break;    \
 363             case 5: ia64_setreg(_IA64_REG_AR_KR5, r); break;    \
 364             case 6: ia64_setreg(_IA64_REG_AR_KR6, r); break;    \
 365             case 7: ia64_setreg(_IA64_REG_AR_KR7, r); break;    \
 366             default: ia64_setreg_unknown_kr(); break;           \
 367         }                                                       \
 368 })
 369
 370 /*
 371  * The following three macros can't be inline functions because we don't have struct
 372  * task_struct at this point.
 373  */
 374
 375 /*
 376  * Return TRUE if task T owns the fph partition of the CPU we're running on.
 377  * Must be called from code that has preemption disabled.
 378  */
 379 #define ia64_is_local_fpu_owner(t)                                                              \
 380 ({                                                                                              \
 381         struct task_struct *__ia64_islfo_task = (t);                                            \
 382         (__ia64_islfo_task->thread.last_fph_cpu == smp_processor_id()                           \
 383          && __ia64_islfo_task == (struct task_struct *) ia64_get_kr(IA64_KR_FPU_OWNER));        \
 384 })
 385
 386 /*
 387  * Mark task T as owning the fph partition of the CPU we're running on.
 388  * Must be called from code that has preemption disabled.
 389  */
 390 #define ia64_set_local_fpu_owner(t) do {                                                \
 391         struct task_struct *__ia64_slfo_task = (t);                                     \
 392         __ia64_slfo_task->thread.last_fph_cpu = smp_processor_id();                     \
 393         ia64_set_kr(IA64_KR_FPU_OWNER, (unsigned long) __ia64_slfo_task);               \
 394 } while (0)
 395
 396 /* Mark the fph partition of task T as being invalid on all CPUs.  */
 397 #define ia64_drop_fpu(t)        ((t)->thread.last_fph_cpu = -1)
 398
 399 extern void __ia64_init_fpu (void);
 400 extern void __ia64_save_fpu (struct ia64_fpreg *fph);
 401 extern void __ia64_load_fpu (struct ia64_fpreg *fph);
 402 extern void ia64_save_debug_regs (unsigned long *save_area);
 403 extern void ia64_load_debug_regs (unsigned long *save_area);
 404
 405 #define ia64_fph_enable()       do { ia64_rsm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
 406 #define ia64_fph_disable()      do { ia64_ssm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
 407
 408 /* load fp 0.0 into fph */
 409 static inline void
 410 ia64_init_fpu (void) {
 411         ia64_fph_enable();
 412         __ia64_init_fpu();
 413         ia64_fph_disable();
 414 }
 415
 416 /* save f32-f127 at FPH */
 417 static inline void
 418 ia64_save_fpu (struct ia64_fpreg *fph) {
 419         ia64_fph_enable();
 420         __ia64_save_fpu(fph);
 421         ia64_fph_disable();
 422 }
 423
 424 /* load f32-f127 from FPH */
 425 static inline void
 426 ia64_load_fpu (struct ia64_fpreg *fph) {
 427         ia64_fph_enable();
 428         __ia64_load_fpu(fph);
 429         ia64_fph_disable();
 430 }
 431
 432 static inline __u64
 433 ia64_clear_ic (void)
 434 {
 435         __u64 psr;
 436         psr = ia64_getreg(_IA64_REG_PSR);
 437         ia64_stop();
 438         ia64_rsm(IA64_PSR_I | IA64_PSR_IC);
 439         ia64_srlz_i();
 440         return psr;
 441 }
 442
 443 /*
 444  * Restore the psr.
 445  */
 446 static inline void
 447 ia64_set_psr (__u64 psr)
 448 {
 449         ia64_stop();
 450         ia64_setreg(_IA64_REG_PSR_L, psr);
 451         ia64_srlz_i();
 452 }
 453
 454 /*
 455  * Insert a translation into an instruction and/or data translation
 456  * register.
 457  */
 458 static inline void
 459 ia64_itr (__u64 target_mask, __u64 tr_num,
 460           __u64 vmaddr, __u64 pte,
 461           __u64 log_page_size)
 462 {
 463         ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
 464         ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
 465         ia64_stop();
 466         if (target_mask & 0x1)
 467                 ia64_itri(tr_num, pte);
 468         if (target_mask & 0x2)
 469                 ia64_itrd(tr_num, pte);
 470 }
 471
 472 /*
 473  * Insert a translation into the instruction and/or data translation
 474  * cache.
 475  */
 476 static inline void
 477 ia64_itc (__u64 target_mask, __u64 vmaddr, __u64 pte,
 478           __u64 log_page_size)
 479 {
 480         ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
 481         ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
 482         ia64_stop();
 483         /* as per EAS2.6, itc must be the last instruction in an instruction group */
 484         if (target_mask & 0x1)
 485                 ia64_itci(pte);
 486         if (target_mask & 0x2)
 487                 ia64_itcd(pte);
 488 }
 489
 490 /*
 491  * Purge a range of addresses from instruction and/or data translation
 492  * register(s).
 493  */
 494 static inline void
 495 ia64_ptr (__u64 target_mask, __u64 vmaddr, __u64 log_size)
 496 {
 497         if (target_mask & 0x1)
 498                 ia64_ptri(vmaddr, (log_size << 2));
 499         if (target_mask & 0x2)
 500                 ia64_ptrd(vmaddr, (log_size << 2));
 501 }
 502
 503 /* Set the interrupt vector address.  The address must be suitably aligned (32KB).  */
 504 static inline void
 505 ia64_set_iva (void *ivt_addr)
 506 {
 507         ia64_setreg(_IA64_REG_CR_IVA, (__u64) ivt_addr);
 508         ia64_srlz_i();
 509 }
 510
 511 /* Set the page table address and control bits.  */
 512 static inline void
 513 ia64_set_pta (__u64 pta)
 514 {
 515         /* Note: srlz.i implies srlz.d */
 516         ia64_setreg(_IA64_REG_CR_PTA, pta);
 517         ia64_srlz_i();
 518 }
 519
 520 static inline void
 521 ia64_eoi (void)
 522 {
 523         ia64_setreg(_IA64_REG_CR_EOI, 0);
 524         ia64_srlz_d();
 525 }
 526
 527 #define cpu_relax()     ia64_hint(ia64_hint_pause)
 528
 529 static inline int
 530 ia64_get_irr(unsigned int vector)
 531 {
 532         unsigned int reg = vector / 64;
 533         unsigned int bit = vector % 64;
 534         unsigned long irr;
 535
 536         switch (reg) {
 537         case 0: irr = ia64_getreg(_IA64_REG_CR_IRR0); break;
 538         case 1: irr = ia64_getreg(_IA64_REG_CR_IRR1); break;
 539         case 2: irr = ia64_getreg(_IA64_REG_CR_IRR2); break;
 540         case 3: irr = ia64_getreg(_IA64_REG_CR_IRR3); break;
 541         }
 542
 543         return test_bit(bit, &irr);
 544 }
 545
 546 static inline void
 547 ia64_set_lrr0 (unsigned long val)
 548 {
 549         ia64_setreg(_IA64_REG_CR_LRR0, val);
 550         ia64_srlz_d();
 551 }
 552
 553 static inline void
 554 ia64_set_lrr1 (unsigned long val)
 555 {
 556         ia64_setreg(_IA64_REG_CR_LRR1, val);
 557         ia64_srlz_d();
 558 }
 559
 560
 561 /*
 562  * Given the address to which a spill occurred, return the unat bit
 563  * number that corresponds to this address.
 564  */
 565 static inline __u64
 566 ia64_unat_pos (void *spill_addr)
 567 {
 568         return ((__u64) spill_addr >> 3) & 0x3f;
 569 }
 570
 571 /*
 572  * Set the NaT bit of an integer register which was spilled at address
 573  * SPILL_ADDR.  UNAT is the mask to be updated.
 574  */
 575 static inline void
 576 ia64_set_unat (__u64 *unat, void *spill_addr, unsigned long nat)
 577 {
 578         __u64 bit = ia64_unat_pos(spill_addr);
 579         __u64 mask = 1UL << bit;
 580
 581         *unat = (*unat & ~mask) | (nat << bit);
 582 }
 583
 584 static inline __u64
 585 ia64_get_ivr (void)
 586 {
 587         __u64 r;
 588         ia64_srlz_d();
 589         r = ia64_getreg(_IA64_REG_CR_IVR);
 590         ia64_srlz_d();
 591         return r;
 592 }
 593
 594 static inline void
 595 ia64_set_dbr (__u64 regnum, __u64 value)
 596 {
 597         __ia64_set_dbr(regnum, value);
 598 #ifdef CONFIG_ITANIUM
 599         ia64_srlz_d();
 600 #endif
 601 }
 602
 603 static inline __u64
 604 ia64_get_dbr (__u64 regnum)
 605 {
 606         __u64 retval;
 607
 608         retval = __ia64_get_dbr(regnum);
 609 #ifdef CONFIG_ITANIUM
 610         ia64_srlz_d();
 611 #endif
 612         return retval;
 613 }
 614
 615 static inline __u64
 616 ia64_rotr (__u64 w, __u64 n)
 617 {
 618         return (w >> n) | (w << (64 - n));
 619 }
 620
 621 #define ia64_rotl(w,n)  ia64_rotr((w), (64) - (n))
 622
 623 /*
 624  * Take a mapped kernel address and return the equivalent address
 625  * in the region 7 identity mapped virtual area.
 626  */
 627 static inline void *
 628 ia64_imva (void *addr)
 629 {
 630         void *result;
 631         result = (void *) ia64_tpa(addr);
 632         return __va(result);
 633 }
 634
 635 #define ARCH_HAS_PREFETCH
 636 #define ARCH_HAS_PREFETCHW
 637 #define PREFETCH_STRIDE                 L1_CACHE_BYTES
 638
 639 static inline void
 640 prefetch (const void *x)
 641 {
 642          ia64_lfetch(ia64_lfhint_none, x);
 643 }
 644
 645 static inline void
 646 prefetchw (const void *x)
 647 {
 648         ia64_lfetch_excl(ia64_lfhint_none, x);
 649 }
 650
 651 extern unsigned long boot_option_idle_override;
 652
 653 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_FORCE_MWAIT,
 654                          IDLE_NOMWAIT, IDLE_POLL};
 655
 656 void default_idle(void);
 657
 658 #endif /* !__ASSEMBLY__ */
 659
 660 #endif /* _ASM_IA64_PROCESSOR_H */