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[~andy/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 __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 #include <linux/bitops.h>
75
76 #include <asm/fpu.h>
77 #include <asm/page.h>
78 #include <asm/percpu.h>
79 #include <asm/rse.h>
80 #include <asm/unwind.h>
81 #include <linux/atomic.h>
82 #ifdef CONFIG_NUMA
83 #include <asm/nodedata.h>
84 #endif
85
86 /* like above but expressed as bitfields for more efficient access: */
87 struct ia64_psr {
88         __u64 reserved0 : 1;
89         __u64 be : 1;
90         __u64 up : 1;
91         __u64 ac : 1;
92         __u64 mfl : 1;
93         __u64 mfh : 1;
94         __u64 reserved1 : 7;
95         __u64 ic : 1;
96         __u64 i : 1;
97         __u64 pk : 1;
98         __u64 reserved2 : 1;
99         __u64 dt : 1;
100         __u64 dfl : 1;
101         __u64 dfh : 1;
102         __u64 sp : 1;
103         __u64 pp : 1;
104         __u64 di : 1;
105         __u64 si : 1;
106         __u64 db : 1;
107         __u64 lp : 1;
108         __u64 tb : 1;
109         __u64 rt : 1;
110         __u64 reserved3 : 4;
111         __u64 cpl : 2;
112         __u64 is : 1;
113         __u64 mc : 1;
114         __u64 it : 1;
115         __u64 id : 1;
116         __u64 da : 1;
117         __u64 dd : 1;
118         __u64 ss : 1;
119         __u64 ri : 2;
120         __u64 ed : 1;
121         __u64 bn : 1;
122         __u64 reserved4 : 19;
123 };
124
125 union ia64_isr {
126         __u64  val;
127         struct {
128                 __u64 code : 16;
129                 __u64 vector : 8;
130                 __u64 reserved1 : 8;
131                 __u64 x : 1;
132                 __u64 w : 1;
133                 __u64 r : 1;
134                 __u64 na : 1;
135                 __u64 sp : 1;
136                 __u64 rs : 1;
137                 __u64 ir : 1;
138                 __u64 ni : 1;
139                 __u64 so : 1;
140                 __u64 ei : 2;
141                 __u64 ed : 1;
142                 __u64 reserved2 : 20;
143         };
144 };
145
146 union ia64_lid {
147         __u64 val;
148         struct {
149                 __u64  rv  : 16;
150                 __u64  eid : 8;
151                 __u64  id  : 8;
152                 __u64  ig  : 32;
153         };
154 };
155
156 union ia64_tpr {
157         __u64 val;
158         struct {
159                 __u64 ig0 : 4;
160                 __u64 mic : 4;
161                 __u64 rsv : 8;
162                 __u64 mmi : 1;
163                 __u64 ig1 : 47;
164         };
165 };
166
167 union ia64_itir {
168         __u64 val;
169         struct {
170                 __u64 rv3  :  2; /* 0-1 */
171                 __u64 ps   :  6; /* 2-7 */
172                 __u64 key  : 24; /* 8-31 */
173                 __u64 rv4  : 32; /* 32-63 */
174         };
175 };
176
177 union  ia64_rr {
178         __u64 val;
179         struct {
180                 __u64  ve       :  1;  /* enable hw walker */
181                 __u64  reserved0:  1;  /* reserved */
182                 __u64  ps       :  6;  /* log page size */
183                 __u64  rid      : 24;  /* region id */
184                 __u64  reserved1: 32;  /* reserved */
185         };
186 };
187
188 /*
189  * CPU type, hardware bug flags, and per-CPU state.  Frequently used
190  * state comes earlier:
191  */
192 struct cpuinfo_ia64 {
193         unsigned int softirq_pending;
194         unsigned long itm_delta;        /* # of clock cycles between clock ticks */
195         unsigned long itm_next;         /* interval timer mask value to use for next clock tick */
196         unsigned long nsec_per_cyc;     /* (1000000000<<IA64_NSEC_PER_CYC_SHIFT)/itc_freq */
197         unsigned long unimpl_va_mask;   /* mask of unimplemented virtual address bits (from PAL) */
198         unsigned long unimpl_pa_mask;   /* mask of unimplemented physical address bits (from PAL) */
199         unsigned long itc_freq;         /* frequency of ITC counter */
200         unsigned long proc_freq;        /* frequency of processor */
201         unsigned long cyc_per_usec;     /* itc_freq/1000000 */
202         unsigned long ptce_base;
203         unsigned int ptce_count[2];
204         unsigned int ptce_stride[2];
205         struct task_struct *ksoftirqd;  /* kernel softirq daemon for this CPU */
206
207 #ifdef CONFIG_SMP
208         unsigned long loops_per_jiffy;
209         int cpu;
210         unsigned int socket_id; /* physical processor socket id */
211         unsigned short core_id; /* core id */
212         unsigned short thread_id; /* thread id */
213         unsigned short num_log; /* Total number of logical processors on
214                                  * this socket that were successfully booted */
215         unsigned char cores_per_socket; /* Cores per processor socket */
216         unsigned char threads_per_core; /* Threads per core */
217 #endif
218
219         /* CPUID-derived information: */
220         unsigned long ppn;
221         unsigned long features;
222         unsigned char number;
223         unsigned char revision;
224         unsigned char model;
225         unsigned char family;
226         unsigned char archrev;
227         char vendor[16];
228         char *model_name;
229
230 #ifdef CONFIG_NUMA
231         struct ia64_node_data *node_data;
232 #endif
233 };
234
235 DECLARE_PER_CPU(struct cpuinfo_ia64, ia64_cpu_info);
236
237 /*
238  * The "local" data variable.  It refers to the per-CPU data of the currently executing
239  * CPU, much like "current" points to the per-task data of the currently executing task.
240  * Do not use the address of local_cpu_data, since it will be different from
241  * cpu_data(smp_processor_id())!
242  */
243 #define local_cpu_data          (&__ia64_per_cpu_var(ia64_cpu_info))
244 #define cpu_data(cpu)           (&per_cpu(ia64_cpu_info, cpu))
245
246 extern void print_cpu_info (struct cpuinfo_ia64 *);
247
248 typedef struct {
249         unsigned long seg;
250 } mm_segment_t;
251
252 #define SET_UNALIGN_CTL(task,value)                                                             \
253 ({                                                                                              \
254         (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_UAC_MASK)                  \
255                                 | (((value) << IA64_THREAD_UAC_SHIFT) & IA64_THREAD_UAC_MASK)); \
256         0;                                                                                      \
257 })
258 #define GET_UNALIGN_CTL(task,addr)                                                              \
259 ({                                                                                              \
260         put_user(((task)->thread.flags & IA64_THREAD_UAC_MASK) >> IA64_THREAD_UAC_SHIFT,        \
261                  (int __user *) (addr));                                                        \
262 })
263
264 #define SET_FPEMU_CTL(task,value)                                                               \
265 ({                                                                                              \
266         (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_FPEMU_MASK)                \
267                           | (((value) << IA64_THREAD_FPEMU_SHIFT) & IA64_THREAD_FPEMU_MASK));   \
268         0;                                                                                      \
269 })
270 #define GET_FPEMU_CTL(task,addr)                                                                \
271 ({                                                                                              \
272         put_user(((task)->thread.flags & IA64_THREAD_FPEMU_MASK) >> IA64_THREAD_FPEMU_SHIFT,    \
273                  (int __user *) (addr));                                                        \
274 })
275
276 struct thread_struct {
277         __u32 flags;                    /* various thread flags (see IA64_THREAD_*) */
278         /* writing on_ustack is performance-critical, so it's worth spending 8 bits on it... */
279         __u8 on_ustack;                 /* executing on user-stacks? */
280         __u8 pad[3];
281         __u64 ksp;                      /* kernel stack pointer */
282         __u64 map_base;                 /* base address for get_unmapped_area() */
283         __u64 rbs_bot;                  /* the base address for the RBS */
284         int last_fph_cpu;               /* CPU that may hold the contents of f32-f127 */
285
286 #ifdef CONFIG_PERFMON
287         void *pfm_context;                   /* pointer to detailed PMU context */
288         unsigned long pfm_needs_checking;    /* when >0, pending perfmon work on kernel exit */
289 # define INIT_THREAD_PM         .pfm_context =          NULL,     \
290                                 .pfm_needs_checking =   0UL,
291 #else
292 # define INIT_THREAD_PM
293 #endif
294         unsigned long dbr[IA64_NUM_DBG_REGS];
295         unsigned long ibr[IA64_NUM_DBG_REGS];
296         struct ia64_fpreg fph[96];      /* saved/loaded on demand */
297 };
298
299 #define INIT_THREAD {                                           \
300         .flags =        0,                                      \
301         .on_ustack =    0,                                      \
302         .ksp =          0,                                      \
303         .map_base =     DEFAULT_MAP_BASE,                       \
304         .rbs_bot =      STACK_TOP - DEFAULT_USER_STACK_SIZE,    \
305         .last_fph_cpu =  -1,                                    \
306         INIT_THREAD_PM                                          \
307         .dbr =          {0, },                                  \
308         .ibr =          {0, },                                  \
309         .fph =          {{{{0}}}, }                             \
310 }
311
312 #define start_thread(regs,new_ip,new_sp) do {                                                   \
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) != SUID_DUMP_USER)) {    \
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... */
334 struct mm_struct;
335 struct 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 /* Get wait channel for task P.  */
345 extern unsigned long get_wchan (struct task_struct *p);
346
347 /* Return instruction pointer of blocked task TSK.  */
348 #define KSTK_EIP(tsk)                                   \
349   ({                                                    \
350         struct pt_regs *_regs = task_pt_regs(tsk);      \
351         _regs->cr_iip + ia64_psr(_regs)->ri;            \
352   })
353
354 /* Return stack pointer of blocked task TSK.  */
355 #define KSTK_ESP(tsk)  ((tsk)->thread.ksp)
356
357 extern void ia64_getreg_unknown_kr (void);
358 extern void ia64_setreg_unknown_kr (void);
359
360 #define ia64_get_kr(regnum)                                     \
361 ({                                                              \
362         unsigned long r = 0;                                    \
363                                                                 \
364         switch (regnum) {                                       \
365             case 0: r = ia64_getreg(_IA64_REG_AR_KR0); break;   \
366             case 1: r = ia64_getreg(_IA64_REG_AR_KR1); break;   \
367             case 2: r = ia64_getreg(_IA64_REG_AR_KR2); break;   \
368             case 3: r = ia64_getreg(_IA64_REG_AR_KR3); break;   \
369             case 4: r = ia64_getreg(_IA64_REG_AR_KR4); break;   \
370             case 5: r = ia64_getreg(_IA64_REG_AR_KR5); break;   \
371             case 6: r = ia64_getreg(_IA64_REG_AR_KR6); break;   \
372             case 7: r = ia64_getreg(_IA64_REG_AR_KR7); break;   \
373             default: ia64_getreg_unknown_kr(); break;           \
374         }                                                       \
375         r;                                                      \
376 })
377
378 #define ia64_set_kr(regnum, r)                                  \
379 ({                                                              \
380         switch (regnum) {                                       \
381             case 0: ia64_setreg(_IA64_REG_AR_KR0, r); break;    \
382             case 1: ia64_setreg(_IA64_REG_AR_KR1, r); break;    \
383             case 2: ia64_setreg(_IA64_REG_AR_KR2, r); break;    \
384             case 3: ia64_setreg(_IA64_REG_AR_KR3, r); break;    \
385             case 4: ia64_setreg(_IA64_REG_AR_KR4, r); break;    \
386             case 5: ia64_setreg(_IA64_REG_AR_KR5, r); break;    \
387             case 6: ia64_setreg(_IA64_REG_AR_KR6, r); break;    \
388             case 7: ia64_setreg(_IA64_REG_AR_KR7, r); break;    \
389             default: ia64_setreg_unknown_kr(); break;           \
390         }                                                       \
391 })
392
393 /*
394  * The following three macros can't be inline functions because we don't have struct
395  * task_struct at this point.
396  */
397
398 /*
399  * Return TRUE if task T owns the fph partition of the CPU we're running on.
400  * Must be called from code that has preemption disabled.
401  */
402 #define ia64_is_local_fpu_owner(t)                                                              \
403 ({                                                                                              \
404         struct task_struct *__ia64_islfo_task = (t);                                            \
405         (__ia64_islfo_task->thread.last_fph_cpu == smp_processor_id()                           \
406          && __ia64_islfo_task == (struct task_struct *) ia64_get_kr(IA64_KR_FPU_OWNER));        \
407 })
408
409 /*
410  * Mark task T as owning the fph partition of the CPU we're running on.
411  * Must be called from code that has preemption disabled.
412  */
413 #define ia64_set_local_fpu_owner(t) do {                                                \
414         struct task_struct *__ia64_slfo_task = (t);                                     \
415         __ia64_slfo_task->thread.last_fph_cpu = smp_processor_id();                     \
416         ia64_set_kr(IA64_KR_FPU_OWNER, (unsigned long) __ia64_slfo_task);               \
417 } while (0)
418
419 /* Mark the fph partition of task T as being invalid on all CPUs.  */
420 #define ia64_drop_fpu(t)        ((t)->thread.last_fph_cpu = -1)
421
422 extern void __ia64_init_fpu (void);
423 extern void __ia64_save_fpu (struct ia64_fpreg *fph);
424 extern void __ia64_load_fpu (struct ia64_fpreg *fph);
425 extern void ia64_save_debug_regs (unsigned long *save_area);
426 extern void ia64_load_debug_regs (unsigned long *save_area);
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_i();
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 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_FORCE_MWAIT,
703                          IDLE_NOMWAIT, IDLE_POLL};
704
705 void default_idle(void);
706
707 #define ia64_platform_is(x) (strcmp(x, ia64_platform_name) == 0)
708
709 #endif /* !__ASSEMBLY__ */
710
711 #endif /* _ASM_IA64_PROCESSOR_H */