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[sfrench/cifs-2.6.git] / 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               DEFAULT_TASK_SIZE
35
36 /*
37  * This decides where the kernel will search for a free chunk of vm
38  * space during mmap's.
39  */
40 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
41
42 #define IA64_THREAD_FPH_VALID   (__IA64_UL(1) << 0)     /* floating-point high state valid? */
43 #define IA64_THREAD_DBG_VALID   (__IA64_UL(1) << 1)     /* debug registers valid? */
44 #define IA64_THREAD_PM_VALID    (__IA64_UL(1) << 2)     /* performance registers valid? */
45 #define IA64_THREAD_UAC_NOPRINT (__IA64_UL(1) << 3)     /* don't log unaligned accesses */
46 #define IA64_THREAD_UAC_SIGBUS  (__IA64_UL(1) << 4)     /* generate SIGBUS on unaligned acc. */
47 #define IA64_THREAD_MIGRATION   (__IA64_UL(1) << 5)     /* require migration
48                                                            sync at ctx sw */
49 #define IA64_THREAD_FPEMU_NOPRINT (__IA64_UL(1) << 6)   /* don't log any fpswa faults */
50 #define IA64_THREAD_FPEMU_SIGFPE  (__IA64_UL(1) << 7)   /* send a SIGFPE for fpswa faults */
51
52 #define IA64_THREAD_UAC_SHIFT   3
53 #define IA64_THREAD_UAC_MASK    (IA64_THREAD_UAC_NOPRINT | IA64_THREAD_UAC_SIGBUS)
54 #define IA64_THREAD_FPEMU_SHIFT 6
55 #define IA64_THREAD_FPEMU_MASK  (IA64_THREAD_FPEMU_NOPRINT | IA64_THREAD_FPEMU_SIGFPE)
56
57
58 /*
59  * This shift should be large enough to be able to represent 1000000000/itc_freq with good
60  * accuracy while being small enough to fit 10*1000000000<<IA64_NSEC_PER_CYC_SHIFT in 64 bits
61  * (this will give enough slack to represent 10 seconds worth of time as a scaled number).
62  */
63 #define IA64_NSEC_PER_CYC_SHIFT 30
64
65 #ifndef __ASSEMBLY__
66
67 #include <linux/cache.h>
68 #include <linux/compiler.h>
69 #include <linux/threads.h>
70 #include <linux/types.h>
71 #include <linux/bitops.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 <linux/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: */
84 struct 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
122 union 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
143 union 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
153 union 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
164 union 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
174 union  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  */
189 struct 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
232 DECLARE_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
243 extern void print_cpu_info (struct cpuinfo_ia64 *);
244
245 typedef 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
273 struct 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 rbs_bot;                  /* the base address for the RBS */
281         int last_fph_cpu;               /* CPU that may hold the contents of f32-f127 */
282
283 #ifdef CONFIG_PERFMON
284         void *pfm_context;                   /* pointer to detailed PMU context */
285         unsigned long pfm_needs_checking;    /* when >0, pending perfmon work on kernel exit */
286 # define INIT_THREAD_PM         .pfm_context =          NULL,     \
287                                 .pfm_needs_checking =   0UL,
288 #else
289 # define INIT_THREAD_PM
290 #endif
291         unsigned long dbr[IA64_NUM_DBG_REGS];
292         unsigned long ibr[IA64_NUM_DBG_REGS];
293         struct ia64_fpreg fph[96];      /* saved/loaded on demand */
294 };
295
296 #define INIT_THREAD {                                           \
297         .flags =        0,                                      \
298         .on_ustack =    0,                                      \
299         .ksp =          0,                                      \
300         .map_base =     DEFAULT_MAP_BASE,                       \
301         .rbs_bot =      STACK_TOP - DEFAULT_USER_STACK_SIZE,    \
302         .last_fph_cpu =  -1,                                    \
303         INIT_THREAD_PM                                          \
304         .dbr =          {0, },                                  \
305         .ibr =          {0, },                                  \
306         .fph =          {{{{0}}}, }                             \
307 }
308
309 #define start_thread(regs,new_ip,new_sp) do {                                                   \
310         regs->cr_ipsr = ((regs->cr_ipsr | (IA64_PSR_BITS_TO_SET | IA64_PSR_CPL))                \
311                          & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_RI | IA64_PSR_IS));              \
312         regs->cr_iip = new_ip;                                                                  \
313         regs->ar_rsc = 0xf;             /* eager mode, privilege level 3 */                     \
314         regs->ar_rnat = 0;                                                                      \
315         regs->ar_bspstore = current->thread.rbs_bot;                                            \
316         regs->ar_fpsr = FPSR_DEFAULT;                                                           \
317         regs->loadrs = 0;                                                                       \
318         regs->r8 = get_dumpable(current->mm);   /* set "don't zap registers" flag */            \
319         regs->r12 = new_sp - 16;        /* allocate 16 byte scratch area */                     \
320         if (unlikely(get_dumpable(current->mm) != SUID_DUMP_USER)) {    \
321                 /*                                                                              \
322                  * Zap scratch regs to avoid leaking bits between processes with different      \
323                  * uid/privileges.                                                              \
324                  */                                                                             \
325                 regs->ar_pfs = 0; regs->b0 = 0; regs->pr = 0;                                   \
326                 regs->r1 = 0; regs->r9  = 0; regs->r11 = 0; regs->r13 = 0; regs->r15 = 0;       \
327         }                                                                                       \
328 } while (0)
329
330 /* Forward declarations, a strange C thing... */
331 struct mm_struct;
332 struct task_struct;
333
334 /*
335  * Free all resources held by a thread. This is called after the
336  * parent of DEAD_TASK has collected the exit status of the task via
337  * wait().
338  */
339 #define release_thread(dead_task)
340
341 /* Get wait channel for task P.  */
342 extern unsigned long get_wchan (struct task_struct *p);
343
344 /* Return instruction pointer of blocked task TSK.  */
345 #define KSTK_EIP(tsk)                                   \
346   ({                                                    \
347         struct pt_regs *_regs = task_pt_regs(tsk);      \
348         _regs->cr_iip + ia64_psr(_regs)->ri;            \
349   })
350
351 /* Return stack pointer of blocked task TSK.  */
352 #define KSTK_ESP(tsk)  ((tsk)->thread.ksp)
353
354 extern void ia64_getreg_unknown_kr (void);
355 extern void ia64_setreg_unknown_kr (void);
356
357 #define ia64_get_kr(regnum)                                     \
358 ({                                                              \
359         unsigned long r = 0;                                    \
360                                                                 \
361         switch (regnum) {                                       \
362             case 0: r = ia64_getreg(_IA64_REG_AR_KR0); break;   \
363             case 1: r = ia64_getreg(_IA64_REG_AR_KR1); break;   \
364             case 2: r = ia64_getreg(_IA64_REG_AR_KR2); break;   \
365             case 3: r = ia64_getreg(_IA64_REG_AR_KR3); break;   \
366             case 4: r = ia64_getreg(_IA64_REG_AR_KR4); break;   \
367             case 5: r = ia64_getreg(_IA64_REG_AR_KR5); break;   \
368             case 6: r = ia64_getreg(_IA64_REG_AR_KR6); break;   \
369             case 7: r = ia64_getreg(_IA64_REG_AR_KR7); break;   \
370             default: ia64_getreg_unknown_kr(); break;           \
371         }                                                       \
372         r;                                                      \
373 })
374
375 #define ia64_set_kr(regnum, r)                                  \
376 ({                                                              \
377         switch (regnum) {                                       \
378             case 0: ia64_setreg(_IA64_REG_AR_KR0, r); break;    \
379             case 1: ia64_setreg(_IA64_REG_AR_KR1, r); break;    \
380             case 2: ia64_setreg(_IA64_REG_AR_KR2, r); break;    \
381             case 3: ia64_setreg(_IA64_REG_AR_KR3, r); break;    \
382             case 4: ia64_setreg(_IA64_REG_AR_KR4, r); break;    \
383             case 5: ia64_setreg(_IA64_REG_AR_KR5, r); break;    \
384             case 6: ia64_setreg(_IA64_REG_AR_KR6, r); break;    \
385             case 7: ia64_setreg(_IA64_REG_AR_KR7, r); break;    \
386             default: ia64_setreg_unknown_kr(); break;           \
387         }                                                       \
388 })
389
390 /*
391  * The following three macros can't be inline functions because we don't have struct
392  * task_struct at this point.
393  */
394
395 /*
396  * Return TRUE if task T owns the fph partition of the CPU we're running on.
397  * Must be called from code that has preemption disabled.
398  */
399 #define ia64_is_local_fpu_owner(t)                                                              \
400 ({                                                                                              \
401         struct task_struct *__ia64_islfo_task = (t);                                            \
402         (__ia64_islfo_task->thread.last_fph_cpu == smp_processor_id()                           \
403          && __ia64_islfo_task == (struct task_struct *) ia64_get_kr(IA64_KR_FPU_OWNER));        \
404 })
405
406 /*
407  * Mark task T as owning the fph partition of the CPU we're running on.
408  * Must be called from code that has preemption disabled.
409  */
410 #define ia64_set_local_fpu_owner(t) do {                                                \
411         struct task_struct *__ia64_slfo_task = (t);                                     \
412         __ia64_slfo_task->thread.last_fph_cpu = smp_processor_id();                     \
413         ia64_set_kr(IA64_KR_FPU_OWNER, (unsigned long) __ia64_slfo_task);               \
414 } while (0)
415
416 /* Mark the fph partition of task T as being invalid on all CPUs.  */
417 #define ia64_drop_fpu(t)        ((t)->thread.last_fph_cpu = -1)
418
419 extern void __ia64_init_fpu (void);
420 extern void __ia64_save_fpu (struct ia64_fpreg *fph);
421 extern void __ia64_load_fpu (struct ia64_fpreg *fph);
422 extern void ia64_save_debug_regs (unsigned long *save_area);
423 extern void ia64_load_debug_regs (unsigned long *save_area);
424
425 #define ia64_fph_enable()       do { ia64_rsm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
426 #define ia64_fph_disable()      do { ia64_ssm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
427
428 /* load fp 0.0 into fph */
429 static inline void
430 ia64_init_fpu (void) {
431         ia64_fph_enable();
432         __ia64_init_fpu();
433         ia64_fph_disable();
434 }
435
436 /* save f32-f127 at FPH */
437 static inline void
438 ia64_save_fpu (struct ia64_fpreg *fph) {
439         ia64_fph_enable();
440         __ia64_save_fpu(fph);
441         ia64_fph_disable();
442 }
443
444 /* load f32-f127 from FPH */
445 static inline void
446 ia64_load_fpu (struct ia64_fpreg *fph) {
447         ia64_fph_enable();
448         __ia64_load_fpu(fph);
449         ia64_fph_disable();
450 }
451
452 static inline __u64
453 ia64_clear_ic (void)
454 {
455         __u64 psr;
456         psr = ia64_getreg(_IA64_REG_PSR);
457         ia64_stop();
458         ia64_rsm(IA64_PSR_I | IA64_PSR_IC);
459         ia64_srlz_i();
460         return psr;
461 }
462
463 /*
464  * Restore the psr.
465  */
466 static inline void
467 ia64_set_psr (__u64 psr)
468 {
469         ia64_stop();
470         ia64_setreg(_IA64_REG_PSR_L, psr);
471         ia64_srlz_i();
472 }
473
474 /*
475  * Insert a translation into an instruction and/or data translation
476  * register.
477  */
478 static inline void
479 ia64_itr (__u64 target_mask, __u64 tr_num,
480           __u64 vmaddr, __u64 pte,
481           __u64 log_page_size)
482 {
483         ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
484         ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
485         ia64_stop();
486         if (target_mask & 0x1)
487                 ia64_itri(tr_num, pte);
488         if (target_mask & 0x2)
489                 ia64_itrd(tr_num, pte);
490 }
491
492 /*
493  * Insert a translation into the instruction and/or data translation
494  * cache.
495  */
496 static inline void
497 ia64_itc (__u64 target_mask, __u64 vmaddr, __u64 pte,
498           __u64 log_page_size)
499 {
500         ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
501         ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
502         ia64_stop();
503         /* as per EAS2.6, itc must be the last instruction in an instruction group */
504         if (target_mask & 0x1)
505                 ia64_itci(pte);
506         if (target_mask & 0x2)
507                 ia64_itcd(pte);
508 }
509
510 /*
511  * Purge a range of addresses from instruction and/or data translation
512  * register(s).
513  */
514 static inline void
515 ia64_ptr (__u64 target_mask, __u64 vmaddr, __u64 log_size)
516 {
517         if (target_mask & 0x1)
518                 ia64_ptri(vmaddr, (log_size << 2));
519         if (target_mask & 0x2)
520                 ia64_ptrd(vmaddr, (log_size << 2));
521 }
522
523 /* Set the interrupt vector address.  The address must be suitably aligned (32KB).  */
524 static inline void
525 ia64_set_iva (void *ivt_addr)
526 {
527         ia64_setreg(_IA64_REG_CR_IVA, (__u64) ivt_addr);
528         ia64_srlz_i();
529 }
530
531 /* Set the page table address and control bits.  */
532 static inline void
533 ia64_set_pta (__u64 pta)
534 {
535         /* Note: srlz.i implies srlz.d */
536         ia64_setreg(_IA64_REG_CR_PTA, pta);
537         ia64_srlz_i();
538 }
539
540 static inline void
541 ia64_eoi (void)
542 {
543         ia64_setreg(_IA64_REG_CR_EOI, 0);
544         ia64_srlz_d();
545 }
546
547 #define cpu_relax()     ia64_hint(ia64_hint_pause)
548
549 static inline int
550 ia64_get_irr(unsigned int vector)
551 {
552         unsigned int reg = vector / 64;
553         unsigned int bit = vector % 64;
554         u64 irr;
555
556         switch (reg) {
557         case 0: irr = ia64_getreg(_IA64_REG_CR_IRR0); break;
558         case 1: irr = ia64_getreg(_IA64_REG_CR_IRR1); break;
559         case 2: irr = ia64_getreg(_IA64_REG_CR_IRR2); break;
560         case 3: irr = ia64_getreg(_IA64_REG_CR_IRR3); break;
561         }
562
563         return test_bit(bit, &irr);
564 }
565
566 static inline void
567 ia64_set_lrr0 (unsigned long val)
568 {
569         ia64_setreg(_IA64_REG_CR_LRR0, val);
570         ia64_srlz_d();
571 }
572
573 static inline void
574 ia64_set_lrr1 (unsigned long val)
575 {
576         ia64_setreg(_IA64_REG_CR_LRR1, val);
577         ia64_srlz_d();
578 }
579
580
581 /*
582  * Given the address to which a spill occurred, return the unat bit
583  * number that corresponds to this address.
584  */
585 static inline __u64
586 ia64_unat_pos (void *spill_addr)
587 {
588         return ((__u64) spill_addr >> 3) & 0x3f;
589 }
590
591 /*
592  * Set the NaT bit of an integer register which was spilled at address
593  * SPILL_ADDR.  UNAT is the mask to be updated.
594  */
595 static inline void
596 ia64_set_unat (__u64 *unat, void *spill_addr, unsigned long nat)
597 {
598         __u64 bit = ia64_unat_pos(spill_addr);
599         __u64 mask = 1UL << bit;
600
601         *unat = (*unat & ~mask) | (nat << bit);
602 }
603
604 /*
605  * Get the current instruction/program counter value.
606  */
607 #define current_text_addr() \
608         ({ void *_pc; _pc = (void *)ia64_getreg(_IA64_REG_IP); _pc; })
609
610 static inline __u64
611 ia64_get_ivr (void)
612 {
613         __u64 r;
614         ia64_srlz_d();
615         r = ia64_getreg(_IA64_REG_CR_IVR);
616         ia64_srlz_d();
617         return r;
618 }
619
620 static inline void
621 ia64_set_dbr (__u64 regnum, __u64 value)
622 {
623         __ia64_set_dbr(regnum, value);
624 #ifdef CONFIG_ITANIUM
625         ia64_srlz_d();
626 #endif
627 }
628
629 static inline __u64
630 ia64_get_dbr (__u64 regnum)
631 {
632         __u64 retval;
633
634         retval = __ia64_get_dbr(regnum);
635 #ifdef CONFIG_ITANIUM
636         ia64_srlz_d();
637 #endif
638         return retval;
639 }
640
641 static inline __u64
642 ia64_rotr (__u64 w, __u64 n)
643 {
644         return (w >> n) | (w << (64 - n));
645 }
646
647 #define ia64_rotl(w,n)  ia64_rotr((w), (64) - (n))
648
649 /*
650  * Take a mapped kernel address and return the equivalent address
651  * in the region 7 identity mapped virtual area.
652  */
653 static inline void *
654 ia64_imva (void *addr)
655 {
656         void *result;
657         result = (void *) ia64_tpa(addr);
658         return __va(result);
659 }
660
661 #define ARCH_HAS_PREFETCH
662 #define ARCH_HAS_PREFETCHW
663 #define ARCH_HAS_SPINLOCK_PREFETCH
664 #define PREFETCH_STRIDE                 L1_CACHE_BYTES
665
666 static inline void
667 prefetch (const void *x)
668 {
669          ia64_lfetch(ia64_lfhint_none, x);
670 }
671
672 static inline void
673 prefetchw (const void *x)
674 {
675         ia64_lfetch_excl(ia64_lfhint_none, x);
676 }
677
678 #define spin_lock_prefetch(x)   prefetchw(x)
679
680 extern unsigned long boot_option_idle_override;
681
682 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_FORCE_MWAIT,
683                          IDLE_NOMWAIT, IDLE_POLL};
684
685 void default_idle(void);
686
687 #define ia64_platform_is(x) (strcmp(x, ia64_platform_name) == 0)
688
689 #endif /* !__ASSEMBLY__ */
690
691 #endif /* _ASM_IA64_PROCESSOR_H */