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[linux-2.6.git] / include / asm-ia64 / processor.h
1 #ifndef _ASM_IA64_PROCESSOR_H
2 #define _ASM_IA64_PROCESSOR_H
3
4 /*
5  * Copyright (C) 1998-2003 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 #include <linux/config.h>
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_DBG_REGS       8
24 /*
25  * Limits for PMC and PMD are set to less than maximum architected values
26  * but should be sufficient for a while
27  */
28 #define IA64_NUM_PMC_REGS       32
29 #define IA64_NUM_PMD_REGS       32
30
31 #define DEFAULT_MAP_BASE        0x2000000000000000
32 #define DEFAULT_TASK_SIZE       0xa000000000000000
33
34 /*
35  * TASK_SIZE really is a mis-named.  It really is the maximum user
36  * space address (plus one).  On IA-64, there are five regions of 2TB
37  * each (assuming 8KB page size), for a total of 8TB of user virtual
38  * address space.
39  */
40 #define TASK_SIZE               (current->thread.task_size)
41
42 /*
43  * MM_VM_SIZE(mm) gives the maximum address (plus 1) which may contain a mapping for
44  * address-space MM.  Note that with 32-bit tasks, this is still DEFAULT_TASK_SIZE,
45  * because the kernel may have installed helper-mappings above TASK_SIZE.  For example,
46  * for x86 emulation, the LDT and GDT are mapped above TASK_SIZE.
47  */
48 #define MM_VM_SIZE(mm)          DEFAULT_TASK_SIZE
49
50 /*
51  * This decides where the kernel will search for a free chunk of vm
52  * space during mmap's.
53  */
54 #define TASK_UNMAPPED_BASE      (current->thread.map_base)
55
56 #define IA64_THREAD_FPH_VALID   (__IA64_UL(1) << 0)     /* floating-point high state valid? */
57 #define IA64_THREAD_DBG_VALID   (__IA64_UL(1) << 1)     /* debug registers valid? */
58 #define IA64_THREAD_PM_VALID    (__IA64_UL(1) << 2)     /* performance registers valid? */
59 #define IA64_THREAD_UAC_NOPRINT (__IA64_UL(1) << 3)     /* don't log unaligned accesses */
60 #define IA64_THREAD_UAC_SIGBUS  (__IA64_UL(1) << 4)     /* generate SIGBUS on unaligned acc. */
61                                                         /* bit 5 is currently unused */
62 #define IA64_THREAD_FPEMU_NOPRINT (__IA64_UL(1) << 6)   /* don't log any fpswa faults */
63 #define IA64_THREAD_FPEMU_SIGFPE  (__IA64_UL(1) << 7)   /* send a SIGFPE for fpswa faults */
64 #define IA64_THREAD_XSTACK      (__IA64_UL(1) << 8)     /* stack executable by default? */
65
66 #define IA64_THREAD_UAC_SHIFT   3
67 #define IA64_THREAD_UAC_MASK    (IA64_THREAD_UAC_NOPRINT | IA64_THREAD_UAC_SIGBUS)
68 #define IA64_THREAD_FPEMU_SHIFT 6
69 #define IA64_THREAD_FPEMU_MASK  (IA64_THREAD_FPEMU_NOPRINT | IA64_THREAD_FPEMU_SIGFPE)
70
71
72 /*
73  * This shift should be large enough to be able to represent 1000000000/itc_freq with good
74  * accuracy while being small enough to fit 10*1000000000<<IA64_NSEC_PER_CYC_SHIFT in 64 bits
75  * (this will give enough slack to represent 10 seconds worth of time as a scaled number).
76  */
77 #define IA64_NSEC_PER_CYC_SHIFT 30
78
79 #ifndef __ASSEMBLY__
80
81 #include <linux/cache.h>
82 #include <linux/compiler.h>
83 #include <linux/threads.h>
84 #include <linux/types.h>
85
86 #include <asm/fpu.h>
87 #include <asm/page.h>
88 #include <asm/percpu.h>
89 #include <asm/rse.h>
90 #include <asm/unwind.h>
91 #include <asm/atomic.h>
92 #ifdef CONFIG_NUMA
93 #include <asm/nodedata.h>
94 #endif
95
96 /* like above but expressed as bitfields for more efficient access: */
97 struct ia64_psr {
98         __u64 reserved0 : 1;
99         __u64 be : 1;
100         __u64 up : 1;
101         __u64 ac : 1;
102         __u64 mfl : 1;
103         __u64 mfh : 1;
104         __u64 reserved1 : 7;
105         __u64 ic : 1;
106         __u64 i : 1;
107         __u64 pk : 1;
108         __u64 reserved2 : 1;
109         __u64 dt : 1;
110         __u64 dfl : 1;
111         __u64 dfh : 1;
112         __u64 sp : 1;
113         __u64 pp : 1;
114         __u64 di : 1;
115         __u64 si : 1;
116         __u64 db : 1;
117         __u64 lp : 1;
118         __u64 tb : 1;
119         __u64 rt : 1;
120         __u64 reserved3 : 4;
121         __u64 cpl : 2;
122         __u64 is : 1;
123         __u64 mc : 1;
124         __u64 it : 1;
125         __u64 id : 1;
126         __u64 da : 1;
127         __u64 dd : 1;
128         __u64 ss : 1;
129         __u64 ri : 2;
130         __u64 ed : 1;
131         __u64 bn : 1;
132         __u64 reserved4 : 19;
133 };
134
135 /*
136  * CPU type, hardware bug flags, and per-CPU state.  Frequently used
137  * state comes earlier:
138  */
139 struct cpuinfo_ia64 {
140         __u32 softirq_pending;
141         __u64 itm_delta;        /* # of clock cycles between clock ticks */
142         __u64 itm_next;         /* interval timer mask value to use for next clock tick */
143         __u64 nsec_per_cyc;     /* (1000000000<<IA64_NSEC_PER_CYC_SHIFT)/itc_freq */
144         __u64 unimpl_va_mask;   /* mask of unimplemented virtual address bits (from PAL) */
145         __u64 unimpl_pa_mask;   /* mask of unimplemented physical address bits (from PAL) */
146         __u64 *pgd_quick;
147         __u64 *pmd_quick;
148         __u64 pgtable_cache_sz;
149         __u64 itc_freq;         /* frequency of ITC counter */
150         __u64 proc_freq;        /* frequency of processor */
151         __u64 cyc_per_usec;     /* itc_freq/1000000 */
152         __u64 ptce_base;
153         __u32 ptce_count[2];
154         __u32 ptce_stride[2];
155         struct task_struct *ksoftirqd;  /* kernel softirq daemon for this CPU */
156
157 #ifdef CONFIG_SMP
158         __u64 loops_per_jiffy;
159         int cpu;
160 #endif
161
162         /* CPUID-derived information: */
163         __u64 ppn;
164         __u64 features;
165         __u8 number;
166         __u8 revision;
167         __u8 model;
168         __u8 family;
169         __u8 archrev;
170         char vendor[16];
171
172 #ifdef CONFIG_NUMA
173         struct ia64_node_data *node_data;
174 #endif
175 };
176
177 DECLARE_PER_CPU(struct cpuinfo_ia64, cpu_info);
178
179 /*
180  * The "local" data variable.  It refers to the per-CPU data of the currently executing
181  * CPU, much like "current" points to the per-task data of the currently executing task.
182  * Do not use the address of local_cpu_data, since it will be different from
183  * cpu_data(smp_processor_id())!
184  */
185 #define local_cpu_data          (&__ia64_per_cpu_var(cpu_info))
186 #define cpu_data(cpu)           (&per_cpu(cpu_info, cpu))
187
188 extern void identify_cpu (struct cpuinfo_ia64 *);
189 extern void print_cpu_info (struct cpuinfo_ia64 *);
190
191 typedef struct {
192         unsigned long seg;
193 } mm_segment_t;
194
195 #define SET_UNALIGN_CTL(task,value)                                                             \
196 ({                                                                                              \
197         (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_UAC_MASK)                  \
198                                 | (((value) << IA64_THREAD_UAC_SHIFT) & IA64_THREAD_UAC_MASK)); \
199         0;                                                                                      \
200 })
201 #define GET_UNALIGN_CTL(task,addr)                                                              \
202 ({                                                                                              \
203         put_user(((task)->thread.flags & IA64_THREAD_UAC_MASK) >> IA64_THREAD_UAC_SHIFT,        \
204                  (int *) (addr));                                                               \
205 })
206
207 #define SET_FPEMU_CTL(task,value)                                                               \
208 ({                                                                                              \
209         (task)->thread.flags = (((task)->thread.flags & ~IA64_THREAD_FPEMU_MASK)                \
210                           | (((value) << IA64_THREAD_FPEMU_SHIFT) & IA64_THREAD_FPEMU_MASK));   \
211         0;                                                                                      \
212 })
213 #define GET_FPEMU_CTL(task,addr)                                                                \
214 ({                                                                                              \
215         put_user(((task)->thread.flags & IA64_THREAD_FPEMU_MASK) >> IA64_THREAD_FPEMU_SHIFT,    \
216                  (int *) (addr));                                                               \
217 })
218
219 #ifdef CONFIG_IA32_SUPPORT
220 struct desc_struct {
221         unsigned int a, b;
222 };
223
224 #define desc_empty(desc)                (!((desc)->a + (desc)->b))
225 #define desc_equal(desc1, desc2)        (((desc1)->a == (desc2)->a) && ((desc1)->b == (desc2)->b))
226
227 #define GDT_ENTRY_TLS_ENTRIES   3
228 #define GDT_ENTRY_TLS_MIN       6
229 #define GDT_ENTRY_TLS_MAX       (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1)
230
231 #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
232
233 struct partial_page_list;
234 #endif
235
236 struct thread_struct {
237         __u32 flags;                    /* various thread flags (see IA64_THREAD_*) */
238         /* writing on_ustack is performance-critical, so it's worth spending 8 bits on it... */
239         __u8 on_ustack;                 /* executing on user-stacks? */
240         __u8 pad[3];
241         __u64 ksp;                      /* kernel stack pointer */
242         __u64 map_base;                 /* base address for get_unmapped_area() */
243         __u64 task_size;                /* limit for task size */
244         __u64 rbs_bot;                  /* the base address for the RBS */
245         int last_fph_cpu;               /* CPU that may hold the contents of f32-f127 */
246
247 #ifdef CONFIG_IA32_SUPPORT
248         __u64 eflag;                    /* IA32 EFLAGS reg */
249         __u64 fsr;                      /* IA32 floating pt status reg */
250         __u64 fcr;                      /* IA32 floating pt control reg */
251         __u64 fir;                      /* IA32 fp except. instr. reg */
252         __u64 fdr;                      /* IA32 fp except. data reg */
253         __u64 old_k1;                   /* old value of ar.k1 */
254         __u64 old_iob;                  /* old IOBase value */
255         struct partial_page_list *ppl;  /* partial page list for 4K page size issue */
256         /* cached TLS descriptors. */
257         struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
258
259 # define INIT_THREAD_IA32       .eflag =        0,                      \
260                                 .fsr =          0,                      \
261                                 .fcr =          0x17800000037fULL,      \
262                                 .fir =          0,                      \
263                                 .fdr =          0,                      \
264                                 .old_k1 =       0,                      \
265                                 .old_iob =      0,                      \
266                                 .ppl =          0,
267 #else
268 # define INIT_THREAD_IA32
269 #endif /* CONFIG_IA32_SUPPORT */
270 #ifdef CONFIG_PERFMON
271         __u64 pmcs[IA64_NUM_PMC_REGS];
272         __u64 pmds[IA64_NUM_PMD_REGS];
273         void *pfm_context;                   /* pointer to detailed PMU context */
274         unsigned long pfm_needs_checking;    /* when >0, pending perfmon work on kernel exit */
275 # define INIT_THREAD_PM         .pmcs =                 {0UL, },  \
276                                 .pmds =                 {0UL, },  \
277                                 .pfm_context =          NULL,     \
278                                 .pfm_needs_checking =   0UL,
279 #else
280 # define INIT_THREAD_PM
281 #endif
282         __u64 dbr[IA64_NUM_DBG_REGS];
283         __u64 ibr[IA64_NUM_DBG_REGS];
284         struct ia64_fpreg fph[96];      /* saved/loaded on demand */
285 };
286
287 #define INIT_THREAD {                                           \
288         .flags =        0,                                      \
289         .on_ustack =    0,                                      \
290         .ksp =          0,                                      \
291         .map_base =     DEFAULT_MAP_BASE,                       \
292         .rbs_bot =      STACK_TOP - DEFAULT_USER_STACK_SIZE,    \
293         .task_size =    DEFAULT_TASK_SIZE,                      \
294         .last_fph_cpu =  -1,                                    \
295         INIT_THREAD_IA32                                        \
296         INIT_THREAD_PM                                          \
297         .dbr =          {0, },                                  \
298         .ibr =          {0, },                                  \
299         .fph =          {{{{0}}}, }                             \
300 }
301
302 #define start_thread(regs,new_ip,new_sp) do {                                                   \
303         set_fs(USER_DS);                                                                        \
304         regs->cr_ipsr = ((regs->cr_ipsr | (IA64_PSR_BITS_TO_SET | IA64_PSR_CPL))                \
305                          & ~(IA64_PSR_BITS_TO_CLEAR | IA64_PSR_RI | IA64_PSR_IS));              \
306         regs->cr_iip = new_ip;                                                                  \
307         regs->ar_rsc = 0xf;             /* eager mode, privilege level 3 */                     \
308         regs->ar_rnat = 0;                                                                      \
309         regs->ar_bspstore = current->thread.rbs_bot;                                            \
310         regs->ar_fpsr = FPSR_DEFAULT;                                                           \
311         regs->loadrs = 0;                                                                       \
312         regs->r8 = current->mm->dumpable;       /* set "don't zap registers" flag */            \
313         regs->r12 = new_sp - 16;        /* allocate 16 byte scratch area */                     \
314         if (unlikely(!current->mm->dumpable)) {                                                 \
315                 /*                                                                              \
316                  * Zap scratch regs to avoid leaking bits between processes with different      \
317                  * uid/privileges.                                                              \
318                  */                                                                             \
319                 regs->ar_pfs = 0; regs->b0 = 0; regs->pr = 0;                                   \
320                 regs->r1 = 0; regs->r9  = 0; regs->r11 = 0; regs->r13 = 0; regs->r15 = 0;       \
321         }                                                                                       \
322 } while (0)
323
324 /* Forward declarations, a strange C thing... */
325 struct mm_struct;
326 struct task_struct;
327
328 /*
329  * Free all resources held by a thread. This is called after the
330  * parent of DEAD_TASK has collected the exit status of the task via
331  * wait().
332  */
333 #define release_thread(dead_task)
334
335 /* Prepare to copy thread state - unlazy all lazy status */
336 #define prepare_to_copy(tsk)    do { } while (0)
337
338 /*
339  * This is the mechanism for creating a new kernel thread.
340  *
341  * NOTE 1: Only a kernel-only process (ie the swapper or direct
342  * descendants who haven't done an "execve()") should use this: it
343  * will work within a system call from a "real" process, but the
344  * process memory space will not be free'd until both the parent and
345  * the child have exited.
346  *
347  * NOTE 2: This MUST NOT be an inlined function.  Otherwise, we get
348  * into trouble in init/main.c when the child thread returns to
349  * do_basic_setup() and the timing is such that free_initmem() has
350  * been called already.
351  */
352 extern pid_t kernel_thread (int (*fn)(void *), void *arg, unsigned long flags);
353
354 /* Get wait channel for task P.  */
355 extern unsigned long get_wchan (struct task_struct *p);
356
357 /* Return instruction pointer of blocked task TSK.  */
358 #define KSTK_EIP(tsk)                                   \
359   ({                                                    \
360         struct pt_regs *_regs = ia64_task_regs(tsk);    \
361         _regs->cr_iip + ia64_psr(_regs)->ri;            \
362   })
363
364 /* Return stack pointer of blocked task TSK.  */
365 #define KSTK_ESP(tsk)  ((tsk)->thread.ksp)
366
367 extern void ia64_getreg_unknown_kr (void);
368 extern void ia64_setreg_unknown_kr (void);
369
370 #define ia64_get_kr(regnum)                                     \
371 ({                                                              \
372         unsigned long r = 0;                                    \
373                                                                 \
374         switch (regnum) {                                       \
375             case 0: r = ia64_getreg(_IA64_REG_AR_KR0); break;   \
376             case 1: r = ia64_getreg(_IA64_REG_AR_KR1); break;   \
377             case 2: r = ia64_getreg(_IA64_REG_AR_KR2); break;   \
378             case 3: r = ia64_getreg(_IA64_REG_AR_KR3); break;   \
379             case 4: r = ia64_getreg(_IA64_REG_AR_KR4); break;   \
380             case 5: r = ia64_getreg(_IA64_REG_AR_KR5); break;   \
381             case 6: r = ia64_getreg(_IA64_REG_AR_KR6); break;   \
382             case 7: r = ia64_getreg(_IA64_REG_AR_KR7); break;   \
383             default: ia64_getreg_unknown_kr(); break;           \
384         }                                                       \
385         r;                                                      \
386 })
387
388 #define ia64_set_kr(regnum, r)                                  \
389 ({                                                              \
390         switch (regnum) {                                       \
391             case 0: ia64_setreg(_IA64_REG_AR_KR0, r); break;    \
392             case 1: ia64_setreg(_IA64_REG_AR_KR1, r); break;    \
393             case 2: ia64_setreg(_IA64_REG_AR_KR2, r); break;    \
394             case 3: ia64_setreg(_IA64_REG_AR_KR3, r); break;    \
395             case 4: ia64_setreg(_IA64_REG_AR_KR4, r); break;    \
396             case 5: ia64_setreg(_IA64_REG_AR_KR5, r); break;    \
397             case 6: ia64_setreg(_IA64_REG_AR_KR6, r); break;    \
398             case 7: ia64_setreg(_IA64_REG_AR_KR7, r); break;    \
399             default: ia64_setreg_unknown_kr(); break;           \
400         }                                                       \
401 })
402
403 /*
404  * The following three macros can't be inline functions because we don't have struct
405  * task_struct at this point.
406  */
407
408 /* Return TRUE if task T owns the fph partition of the CPU we're running on. */
409 #define ia64_is_local_fpu_owner(t)                                                              \
410 ({                                                                                              \
411         struct task_struct *__ia64_islfo_task = (t);                                            \
412         (__ia64_islfo_task->thread.last_fph_cpu == smp_processor_id()                           \
413          && __ia64_islfo_task == (struct task_struct *) ia64_get_kr(IA64_KR_FPU_OWNER));        \
414 })
415
416 /* Mark task T as owning the fph partition of the CPU we're running on. */
417 #define ia64_set_local_fpu_owner(t) do {                                                \
418         struct task_struct *__ia64_slfo_task = (t);                                     \
419         __ia64_slfo_task->thread.last_fph_cpu = smp_processor_id();                     \
420         ia64_set_kr(IA64_KR_FPU_OWNER, (unsigned long) __ia64_slfo_task);               \
421 } while (0)
422
423 /* Mark the fph partition of task T as being invalid on all CPUs.  */
424 #define ia64_drop_fpu(t)        ((t)->thread.last_fph_cpu = -1)
425
426 extern void __ia64_init_fpu (void);
427 extern void __ia64_save_fpu (struct ia64_fpreg *fph);
428 extern void __ia64_load_fpu (struct ia64_fpreg *fph);
429 extern void ia64_save_debug_regs (unsigned long *save_area);
430 extern void ia64_load_debug_regs (unsigned long *save_area);
431
432 #ifdef CONFIG_IA32_SUPPORT
433 extern void ia32_save_state (struct task_struct *task);
434 extern void ia32_load_state (struct task_struct *task);
435 #endif
436
437 #define ia64_fph_enable()       do { ia64_rsm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
438 #define ia64_fph_disable()      do { ia64_ssm(IA64_PSR_DFH); ia64_srlz_d(); } while (0)
439
440 /* load fp 0.0 into fph */
441 static inline void
442 ia64_init_fpu (void) {
443         ia64_fph_enable();
444         __ia64_init_fpu();
445         ia64_fph_disable();
446 }
447
448 /* save f32-f127 at FPH */
449 static inline void
450 ia64_save_fpu (struct ia64_fpreg *fph) {
451         ia64_fph_enable();
452         __ia64_save_fpu(fph);
453         ia64_fph_disable();
454 }
455
456 /* load f32-f127 from FPH */
457 static inline void
458 ia64_load_fpu (struct ia64_fpreg *fph) {
459         ia64_fph_enable();
460         __ia64_load_fpu(fph);
461         ia64_fph_disable();
462 }
463
464 static inline __u64
465 ia64_clear_ic (void)
466 {
467         __u64 psr;
468         psr = ia64_getreg(_IA64_REG_PSR);
469         ia64_stop();
470         ia64_rsm(IA64_PSR_I | IA64_PSR_IC);
471         ia64_srlz_i();
472         return psr;
473 }
474
475 /*
476  * Restore the psr.
477  */
478 static inline void
479 ia64_set_psr (__u64 psr)
480 {
481         ia64_stop();
482         ia64_setreg(_IA64_REG_PSR_L, psr);
483         ia64_srlz_d();
484 }
485
486 /*
487  * Insert a translation into an instruction and/or data translation
488  * register.
489  */
490 static inline void
491 ia64_itr (__u64 target_mask, __u64 tr_num,
492           __u64 vmaddr, __u64 pte,
493           __u64 log_page_size)
494 {
495         ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
496         ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
497         ia64_stop();
498         if (target_mask & 0x1)
499                 ia64_itri(tr_num, pte);
500         if (target_mask & 0x2)
501                 ia64_itrd(tr_num, pte);
502 }
503
504 /*
505  * Insert a translation into the instruction and/or data translation
506  * cache.
507  */
508 static inline void
509 ia64_itc (__u64 target_mask, __u64 vmaddr, __u64 pte,
510           __u64 log_page_size)
511 {
512         ia64_setreg(_IA64_REG_CR_ITIR, (log_page_size << 2));
513         ia64_setreg(_IA64_REG_CR_IFA, vmaddr);
514         ia64_stop();
515         /* as per EAS2.6, itc must be the last instruction in an instruction group */
516         if (target_mask & 0x1)
517                 ia64_itci(pte);
518         if (target_mask & 0x2)
519                 ia64_itcd(pte);
520 }
521
522 /*
523  * Purge a range of addresses from instruction and/or data translation
524  * register(s).
525  */
526 static inline void
527 ia64_ptr (__u64 target_mask, __u64 vmaddr, __u64 log_size)
528 {
529         if (target_mask & 0x1)
530                 ia64_ptri(vmaddr, (log_size << 2));
531         if (target_mask & 0x2)
532                 ia64_ptrd(vmaddr, (log_size << 2));
533 }
534
535 /* Set the interrupt vector address.  The address must be suitably aligned (32KB).  */
536 static inline void
537 ia64_set_iva (void *ivt_addr)
538 {
539         ia64_setreg(_IA64_REG_CR_IVA, (__u64) ivt_addr);
540         ia64_srlz_i();
541 }
542
543 /* Set the page table address and control bits.  */
544 static inline void
545 ia64_set_pta (__u64 pta)
546 {
547         /* Note: srlz.i implies srlz.d */
548         ia64_setreg(_IA64_REG_CR_PTA, pta);
549         ia64_srlz_i();
550 }
551
552 static inline void
553 ia64_eoi (void)
554 {
555         ia64_setreg(_IA64_REG_CR_EOI, 0);
556         ia64_srlz_d();
557 }
558
559 #define cpu_relax()     ia64_hint(ia64_hint_pause)
560
561 static inline void
562 ia64_set_lrr0 (unsigned long val)
563 {
564         ia64_setreg(_IA64_REG_CR_LRR0, val);
565         ia64_srlz_d();
566 }
567
568 static inline void
569 ia64_set_lrr1 (unsigned long val)
570 {
571         ia64_setreg(_IA64_REG_CR_LRR1, val);
572         ia64_srlz_d();
573 }
574
575
576 /*
577  * Given the address to which a spill occurred, return the unat bit
578  * number that corresponds to this address.
579  */
580 static inline __u64
581 ia64_unat_pos (void *spill_addr)
582 {
583         return ((__u64) spill_addr >> 3) & 0x3f;
584 }
585
586 /*
587  * Set the NaT bit of an integer register which was spilled at address
588  * SPILL_ADDR.  UNAT is the mask to be updated.
589  */
590 static inline void
591 ia64_set_unat (__u64 *unat, void *spill_addr, unsigned long nat)
592 {
593         __u64 bit = ia64_unat_pos(spill_addr);
594         __u64 mask = 1UL << bit;
595
596         *unat = (*unat & ~mask) | (nat << bit);
597 }
598
599 /*
600  * Return saved PC of a blocked thread.
601  * Note that the only way T can block is through a call to schedule() -> switch_to().
602  */
603 static inline unsigned long
604 thread_saved_pc (struct task_struct *t)
605 {
606         struct unw_frame_info info;
607         unsigned long ip;
608
609         unw_init_from_blocked_task(&info, t);
610         if (unw_unwind(&info) < 0)
611                 return 0;
612         unw_get_ip(&info, &ip);
613         return ip;
614 }
615
616 /*
617  * Get the current instruction/program counter value.
618  */
619 #define current_text_addr() \
620         ({ void *_pc; _pc = (void *)ia64_getreg(_IA64_REG_IP); _pc; })
621
622 static inline __u64
623 ia64_get_ivr (void)
624 {
625         __u64 r;
626         ia64_srlz_d();
627         r = ia64_getreg(_IA64_REG_CR_IVR);
628         ia64_srlz_d();
629         return r;
630 }
631
632 static inline void
633 ia64_set_dbr (__u64 regnum, __u64 value)
634 {
635         __ia64_set_dbr(regnum, value);
636 #ifdef CONFIG_ITANIUM
637         ia64_srlz_d();
638 #endif
639 }
640
641 static inline __u64
642 ia64_get_dbr (__u64 regnum)
643 {
644         __u64 retval;
645
646         retval = __ia64_get_dbr(regnum);
647 #ifdef CONFIG_ITANIUM
648         ia64_srlz_d();
649 #endif
650         return retval;
651 }
652
653 static inline __u64
654 ia64_rotr (__u64 w, __u64 n)
655 {
656         return (w >> n) | (w << (64 - n));
657 }
658
659 #define ia64_rotl(w,n)  ia64_rotr((w), (64) - (n))
660
661 /*
662  * Take a mapped kernel address and return the equivalent address
663  * in the region 7 identity mapped virtual area.
664  */
665 static inline void *
666 ia64_imva (void *addr)
667 {
668         void *result;
669         result = (void *) ia64_tpa(addr);
670         return __va(result);
671 }
672
673 #define ARCH_HAS_PREFETCH
674 #define ARCH_HAS_PREFETCHW
675 #define ARCH_HAS_SPINLOCK_PREFETCH
676 #define PREFETCH_STRIDE                 L1_CACHE_BYTES
677
678 static inline void
679 prefetch (const void *x)
680 {
681          ia64_lfetch(ia64_lfhint_none, x);
682 }
683
684 static inline void
685 prefetchw (const void *x)
686 {
687         ia64_lfetch_excl(ia64_lfhint_none, x);
688 }
689
690 #define spin_lock_prefetch(x)   prefetchw(x)
691
692 #endif /* !__ASSEMBLY__ */
693
694 #endif /* _ASM_IA64_PROCESSOR_H */