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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * TLB support routines. | |
3 | * | |
4 | * Copyright (C) 1998-2001, 2003 Hewlett-Packard Co | |
5 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
6 | * | |
7 | * 08/02/00 A. Mallick <asit.k.mallick@intel.com> | |
8 | * Modified RID allocation for SMP | |
9 | * Goutham Rao <goutham.rao@intel.com> | |
10 | * IPI based ptc implementation and A-step IPI implementation. | |
dcc17d1b PK |
11 | * Rohit Seth <rohit.seth@intel.com> |
12 | * Ken Chen <kenneth.w.chen@intel.com> | |
aec103bf | 13 | * Christophe de Dinechin <ddd@hp.com>: Avoid ptc.e on memory allocation |
2046b94e FY |
14 | * Copyright (C) 2007 Intel Corp |
15 | * Fenghua Yu <fenghua.yu@intel.com> | |
16 | * Add multiple ptc.g/ptc.ga instruction support in global tlb purge. | |
1da177e4 | 17 | */ |
1da177e4 LT |
18 | #include <linux/module.h> |
19 | #include <linux/init.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/smp.h> | |
23 | #include <linux/mm.h> | |
dcc17d1b | 24 | #include <linux/bootmem.h> |
1da177e4 LT |
25 | |
26 | #include <asm/delay.h> | |
27 | #include <asm/mmu_context.h> | |
28 | #include <asm/pgalloc.h> | |
29 | #include <asm/pal.h> | |
30 | #include <asm/tlbflush.h> | |
dcc17d1b | 31 | #include <asm/dma.h> |
96651896 | 32 | #include <asm/processor.h> |
2046b94e | 33 | #include <asm/sal.h> |
96651896 | 34 | #include <asm/tlb.h> |
1da177e4 LT |
35 | |
36 | static struct { | |
37 | unsigned long mask; /* mask of supported purge page-sizes */ | |
58cd9082 | 38 | unsigned long max_bits; /* log2 of largest supported purge page-size */ |
1da177e4 LT |
39 | } purge; |
40 | ||
41 | struct ia64_ctx ia64_ctx = { | |
8737d595 MAC |
42 | .lock = __SPIN_LOCK_UNLOCKED(ia64_ctx.lock), |
43 | .next = 1, | |
44 | .max_ctx = ~0U | |
1da177e4 LT |
45 | }; |
46 | ||
47 | DEFINE_PER_CPU(u8, ia64_need_tlb_flush); | |
96651896 XZ |
48 | DEFINE_PER_CPU(u8, ia64_tr_num); /*Number of TR slots in current processor*/ |
49 | DEFINE_PER_CPU(u8, ia64_tr_used); /*Max Slot number used by kernel*/ | |
50 | ||
51 | struct ia64_tr_entry __per_cpu_idtrs[NR_CPUS][2][IA64_TR_ALLOC_MAX]; | |
1da177e4 | 52 | |
dcc17d1b PK |
53 | /* |
54 | * Initializes the ia64_ctx.bitmap array based on max_ctx+1. | |
55 | * Called after cpu_init() has setup ia64_ctx.max_ctx based on | |
56 | * maximum RID that is supported by boot CPU. | |
57 | */ | |
58 | void __init | |
59 | mmu_context_init (void) | |
60 | { | |
61 | ia64_ctx.bitmap = alloc_bootmem((ia64_ctx.max_ctx+1)>>3); | |
62 | ia64_ctx.flushmap = alloc_bootmem((ia64_ctx.max_ctx+1)>>3); | |
63 | } | |
64 | ||
1da177e4 LT |
65 | /* |
66 | * Acquire the ia64_ctx.lock before calling this function! | |
67 | */ | |
68 | void | |
69 | wrap_mmu_context (struct mm_struct *mm) | |
70 | { | |
58cd9082 | 71 | int i, cpu; |
dcc17d1b | 72 | unsigned long flush_bit; |
1da177e4 | 73 | |
dcc17d1b PK |
74 | for (i=0; i <= ia64_ctx.max_ctx / BITS_PER_LONG; i++) { |
75 | flush_bit = xchg(&ia64_ctx.flushmap[i], 0); | |
76 | ia64_ctx.bitmap[i] ^= flush_bit; | |
1da177e4 | 77 | } |
dcc17d1b PK |
78 | |
79 | /* use offset at 300 to skip daemons */ | |
80 | ia64_ctx.next = find_next_zero_bit(ia64_ctx.bitmap, | |
81 | ia64_ctx.max_ctx, 300); | |
82 | ia64_ctx.limit = find_next_bit(ia64_ctx.bitmap, | |
83 | ia64_ctx.max_ctx, ia64_ctx.next); | |
84 | ||
58cd9082 KC |
85 | /* |
86 | * can't call flush_tlb_all() here because of race condition | |
87 | * with O(1) scheduler [EF] | |
88 | */ | |
89 | cpu = get_cpu(); /* prevent preemption/migration */ | |
90 | for_each_online_cpu(i) | |
91 | if (i != cpu) | |
92 | per_cpu(ia64_need_tlb_flush, i) = 1; | |
93 | put_cpu(); | |
1da177e4 LT |
94 | local_flush_tlb_all(); |
95 | } | |
96 | ||
2046b94e FY |
97 | /* |
98 | * Implement "spinaphores" ... like counting semaphores, but they | |
99 | * spin instead of sleeping. If there are ever any other users for | |
100 | * this primitive it can be moved up to a spinaphore.h header. | |
101 | */ | |
102 | struct spinaphore { | |
103 | atomic_t cur; | |
104 | }; | |
105 | ||
106 | static inline void spinaphore_init(struct spinaphore *ss, int val) | |
107 | { | |
108 | atomic_set(&ss->cur, val); | |
109 | } | |
110 | ||
111 | static inline void down_spin(struct spinaphore *ss) | |
112 | { | |
113 | while (unlikely(!atomic_add_unless(&ss->cur, -1, 0))) | |
114 | while (atomic_read(&ss->cur) == 0) | |
115 | cpu_relax(); | |
116 | } | |
117 | ||
118 | static inline void up_spin(struct spinaphore *ss) | |
119 | { | |
120 | atomic_add(1, &ss->cur); | |
121 | } | |
122 | ||
123 | static struct spinaphore ptcg_sem; | |
124 | static u16 nptcg = 1; | |
125 | static int need_ptcg_sem = 1; | |
126 | static int toolatetochangeptcgsem = 0; | |
127 | ||
a6c75b86 FY |
128 | /* |
129 | * Kernel parameter "nptcg=" overrides max number of concurrent global TLB | |
130 | * purges which is reported from either PAL or SAL PALO. | |
131 | * | |
132 | * We don't have sanity checking for nptcg value. It's the user's responsibility | |
133 | * for valid nptcg value on the platform. Otherwise, kernel may hang in some | |
134 | * cases. | |
135 | */ | |
136 | static int __init | |
137 | set_nptcg(char *str) | |
138 | { | |
139 | int value = 0; | |
140 | ||
141 | get_option(&str, &value); | |
142 | setup_ptcg_sem(value, NPTCG_FROM_KERNEL_PARAMETER); | |
143 | ||
144 | return 1; | |
145 | } | |
146 | ||
147 | __setup("nptcg=", set_nptcg); | |
148 | ||
2046b94e FY |
149 | /* |
150 | * Maximum number of simultaneous ptc.g purges in the system can | |
151 | * be defined by PAL_VM_SUMMARY (in which case we should take | |
152 | * the smallest value for any cpu in the system) or by the PAL | |
153 | * override table (in which case we should ignore the value from | |
154 | * PAL_VM_SUMMARY). | |
155 | * | |
a6c75b86 FY |
156 | * Kernel parameter "nptcg=" overrides maximum number of simultanesous ptc.g |
157 | * purges defined in either PAL_VM_SUMMARY or PAL override table. In this case, | |
158 | * we should ignore the value from either PAL_VM_SUMMARY or PAL override table. | |
159 | * | |
2046b94e FY |
160 | * Complicating the logic here is the fact that num_possible_cpus() |
161 | * isn't fully setup until we start bringing cpus online. | |
162 | */ | |
163 | void | |
a6c75b86 | 164 | setup_ptcg_sem(int max_purges, int nptcg_from) |
2046b94e | 165 | { |
a6c75b86 FY |
166 | static int kp_override; |
167 | static int palo_override; | |
2046b94e FY |
168 | static int firstcpu = 1; |
169 | ||
170 | if (toolatetochangeptcgsem) { | |
171 | BUG_ON(max_purges < nptcg); | |
172 | return; | |
173 | } | |
174 | ||
a6c75b86 FY |
175 | if (nptcg_from == NPTCG_FROM_KERNEL_PARAMETER) { |
176 | kp_override = 1; | |
177 | nptcg = max_purges; | |
178 | goto resetsema; | |
179 | } | |
180 | if (kp_override) { | |
181 | need_ptcg_sem = num_possible_cpus() > nptcg; | |
182 | return; | |
183 | } | |
184 | ||
185 | if (nptcg_from == NPTCG_FROM_PALO) { | |
186 | palo_override = 1; | |
2046b94e FY |
187 | |
188 | /* In PALO max_purges == 0 really means it! */ | |
189 | if (max_purges == 0) | |
190 | panic("Whoa! Platform does not support global TLB purges.\n"); | |
191 | nptcg = max_purges; | |
192 | if (nptcg == PALO_MAX_TLB_PURGES) { | |
193 | need_ptcg_sem = 0; | |
194 | return; | |
195 | } | |
196 | goto resetsema; | |
197 | } | |
a6c75b86 | 198 | if (palo_override) { |
2046b94e FY |
199 | if (nptcg != PALO_MAX_TLB_PURGES) |
200 | need_ptcg_sem = (num_possible_cpus() > nptcg); | |
201 | return; | |
202 | } | |
203 | ||
204 | /* In PAL_VM_SUMMARY max_purges == 0 actually means 1 */ | |
205 | if (max_purges == 0) max_purges = 1; | |
206 | ||
207 | if (firstcpu) { | |
208 | nptcg = max_purges; | |
209 | firstcpu = 0; | |
210 | } | |
211 | if (max_purges < nptcg) | |
212 | nptcg = max_purges; | |
213 | if (nptcg == PAL_MAX_PURGES) { | |
214 | need_ptcg_sem = 0; | |
215 | return; | |
216 | } else | |
217 | need_ptcg_sem = (num_possible_cpus() > nptcg); | |
218 | ||
219 | resetsema: | |
220 | spinaphore_init(&ptcg_sem, max_purges); | |
221 | } | |
222 | ||
1da177e4 | 223 | void |
58cd9082 KC |
224 | ia64_global_tlb_purge (struct mm_struct *mm, unsigned long start, |
225 | unsigned long end, unsigned long nbits) | |
1da177e4 | 226 | { |
aec103bf DCIV |
227 | struct mm_struct *active_mm = current->active_mm; |
228 | ||
2046b94e FY |
229 | toolatetochangeptcgsem = 1; |
230 | ||
aec103bf DCIV |
231 | if (mm != active_mm) { |
232 | /* Restore region IDs for mm */ | |
233 | if (mm && active_mm) { | |
234 | activate_context(mm); | |
235 | } else { | |
236 | flush_tlb_all(); | |
237 | return; | |
238 | } | |
c1902aae DR |
239 | } |
240 | ||
2046b94e FY |
241 | if (need_ptcg_sem) |
242 | down_spin(&ptcg_sem); | |
243 | ||
244 | do { | |
245 | /* | |
246 | * Flush ALAT entries also. | |
247 | */ | |
248 | ia64_ptcga(start, (nbits << 2)); | |
249 | ia64_srlz_i(); | |
250 | start += (1UL << nbits); | |
251 | } while (start < end); | |
252 | ||
253 | if (need_ptcg_sem) | |
254 | up_spin(&ptcg_sem); | |
aec103bf DCIV |
255 | |
256 | if (mm != active_mm) { | |
257 | activate_context(active_mm); | |
258 | } | |
1da177e4 LT |
259 | } |
260 | ||
261 | void | |
262 | local_flush_tlb_all (void) | |
263 | { | |
264 | unsigned long i, j, flags, count0, count1, stride0, stride1, addr; | |
265 | ||
266 | addr = local_cpu_data->ptce_base; | |
267 | count0 = local_cpu_data->ptce_count[0]; | |
268 | count1 = local_cpu_data->ptce_count[1]; | |
269 | stride0 = local_cpu_data->ptce_stride[0]; | |
270 | stride1 = local_cpu_data->ptce_stride[1]; | |
271 | ||
272 | local_irq_save(flags); | |
273 | for (i = 0; i < count0; ++i) { | |
274 | for (j = 0; j < count1; ++j) { | |
275 | ia64_ptce(addr); | |
276 | addr += stride1; | |
277 | } | |
278 | addr += stride0; | |
279 | } | |
280 | local_irq_restore(flags); | |
281 | ia64_srlz_i(); /* srlz.i implies srlz.d */ | |
282 | } | |
283 | ||
284 | void | |
58cd9082 KC |
285 | flush_tlb_range (struct vm_area_struct *vma, unsigned long start, |
286 | unsigned long end) | |
1da177e4 LT |
287 | { |
288 | struct mm_struct *mm = vma->vm_mm; | |
289 | unsigned long size = end - start; | |
290 | unsigned long nbits; | |
291 | ||
c1902aae | 292 | #ifndef CONFIG_SMP |
1da177e4 | 293 | if (mm != current->active_mm) { |
1da177e4 | 294 | mm->context = 0; |
1da177e4 LT |
295 | return; |
296 | } | |
c1902aae | 297 | #endif |
1da177e4 LT |
298 | |
299 | nbits = ia64_fls(size + 0xfff); | |
58cd9082 KC |
300 | while (unlikely (((1UL << nbits) & purge.mask) == 0) && |
301 | (nbits < purge.max_bits)) | |
1da177e4 LT |
302 | ++nbits; |
303 | if (nbits > purge.max_bits) | |
304 | nbits = purge.max_bits; | |
305 | start &= ~((1UL << nbits) - 1); | |
306 | ||
663b97f7 | 307 | preempt_disable(); |
ce9eed5a KC |
308 | #ifdef CONFIG_SMP |
309 | if (mm != current->active_mm || cpus_weight(mm->cpu_vm_mask) != 1) { | |
310 | platform_global_tlb_purge(mm, start, end, nbits); | |
311 | preempt_enable(); | |
312 | return; | |
313 | } | |
314 | #endif | |
1da177e4 LT |
315 | do { |
316 | ia64_ptcl(start, (nbits<<2)); | |
317 | start += (1UL << nbits); | |
318 | } while (start < end); | |
663b97f7 | 319 | preempt_enable(); |
1da177e4 LT |
320 | ia64_srlz_i(); /* srlz.i implies srlz.d */ |
321 | } | |
322 | EXPORT_SYMBOL(flush_tlb_range); | |
323 | ||
324 | void __devinit | |
325 | ia64_tlb_init (void) | |
326 | { | |
256a7e09 | 327 | ia64_ptce_info_t uninitialized_var(ptce_info); /* GCC be quiet */ |
1da177e4 LT |
328 | unsigned long tr_pgbits; |
329 | long status; | |
96651896 XZ |
330 | pal_vm_info_1_u_t vm_info_1; |
331 | pal_vm_info_2_u_t vm_info_2; | |
332 | int cpu = smp_processor_id(); | |
1da177e4 LT |
333 | |
334 | if ((status = ia64_pal_vm_page_size(&tr_pgbits, &purge.mask)) != 0) { | |
c2eeb321 | 335 | printk(KERN_ERR "PAL_VM_PAGE_SIZE failed with status=%ld; " |
1da177e4 LT |
336 | "defaulting to architected purge page-sizes.\n", status); |
337 | purge.mask = 0x115557000UL; | |
338 | } | |
339 | purge.max_bits = ia64_fls(purge.mask); | |
340 | ||
341 | ia64_get_ptce(&ptce_info); | |
342 | local_cpu_data->ptce_base = ptce_info.base; | |
343 | local_cpu_data->ptce_count[0] = ptce_info.count[0]; | |
344 | local_cpu_data->ptce_count[1] = ptce_info.count[1]; | |
345 | local_cpu_data->ptce_stride[0] = ptce_info.stride[0]; | |
346 | local_cpu_data->ptce_stride[1] = ptce_info.stride[1]; | |
347 | ||
58cd9082 | 348 | local_flush_tlb_all(); /* nuke left overs from bootstrapping... */ |
96651896 XZ |
349 | status = ia64_pal_vm_summary(&vm_info_1, &vm_info_2); |
350 | ||
351 | if (status) { | |
352 | printk(KERN_ERR "ia64_pal_vm_summary=%ld\n", status); | |
353 | per_cpu(ia64_tr_num, cpu) = 8; | |
354 | return; | |
355 | } | |
356 | per_cpu(ia64_tr_num, cpu) = vm_info_1.pal_vm_info_1_s.max_itr_entry+1; | |
357 | if (per_cpu(ia64_tr_num, cpu) > | |
358 | (vm_info_1.pal_vm_info_1_s.max_dtr_entry+1)) | |
359 | per_cpu(ia64_tr_num, cpu) = | |
360 | vm_info_1.pal_vm_info_1_s.max_dtr_entry+1; | |
361 | if (per_cpu(ia64_tr_num, cpu) > IA64_TR_ALLOC_MAX) { | |
362 | per_cpu(ia64_tr_num, cpu) = IA64_TR_ALLOC_MAX; | |
363 | printk(KERN_DEBUG "TR register number exceeds IA64_TR_ALLOC_MAX!" | |
364 | "IA64_TR_ALLOC_MAX should be extended\n"); | |
365 | } | |
366 | } | |
367 | ||
368 | /* | |
369 | * is_tr_overlap | |
370 | * | |
371 | * Check overlap with inserted TRs. | |
372 | */ | |
373 | static int is_tr_overlap(struct ia64_tr_entry *p, u64 va, u64 log_size) | |
374 | { | |
375 | u64 tr_log_size; | |
376 | u64 tr_end; | |
377 | u64 va_rr = ia64_get_rr(va); | |
378 | u64 va_rid = RR_TO_RID(va_rr); | |
379 | u64 va_end = va + (1<<log_size) - 1; | |
380 | ||
381 | if (va_rid != RR_TO_RID(p->rr)) | |
382 | return 0; | |
383 | tr_log_size = (p->itir & 0xff) >> 2; | |
384 | tr_end = p->ifa + (1<<tr_log_size) - 1; | |
385 | ||
386 | if (va > tr_end || p->ifa > va_end) | |
387 | return 0; | |
388 | return 1; | |
389 | ||
390 | } | |
391 | ||
392 | /* | |
393 | * ia64_insert_tr in virtual mode. Allocate a TR slot | |
394 | * | |
395 | * target_mask : 0x1 : itr, 0x2 : dtr, 0x3 : idtr | |
396 | * | |
397 | * va : virtual address. | |
398 | * pte : pte entries inserted. | |
399 | * log_size: range to be covered. | |
400 | * | |
401 | * Return value: <0 : error No. | |
402 | * | |
403 | * >=0 : slot number allocated for TR. | |
404 | * Must be called with preemption disabled. | |
405 | */ | |
406 | int ia64_itr_entry(u64 target_mask, u64 va, u64 pte, u64 log_size) | |
407 | { | |
408 | int i, r; | |
409 | unsigned long psr; | |
410 | struct ia64_tr_entry *p; | |
411 | int cpu = smp_processor_id(); | |
412 | ||
413 | r = -EINVAL; | |
414 | /*Check overlap with existing TR entries*/ | |
415 | if (target_mask & 0x1) { | |
416 | p = &__per_cpu_idtrs[cpu][0][0]; | |
417 | for (i = IA64_TR_ALLOC_BASE; i <= per_cpu(ia64_tr_used, cpu); | |
418 | i++, p++) { | |
419 | if (p->pte & 0x1) | |
420 | if (is_tr_overlap(p, va, log_size)) { | |
421 | printk(KERN_DEBUG "Overlapped Entry" | |
422 | "Inserted for TR Reigster!!\n"); | |
423 | goto out; | |
424 | } | |
425 | } | |
426 | } | |
427 | if (target_mask & 0x2) { | |
428 | p = &__per_cpu_idtrs[cpu][1][0]; | |
429 | for (i = IA64_TR_ALLOC_BASE; i <= per_cpu(ia64_tr_used, cpu); | |
430 | i++, p++) { | |
431 | if (p->pte & 0x1) | |
432 | if (is_tr_overlap(p, va, log_size)) { | |
433 | printk(KERN_DEBUG "Overlapped Entry" | |
434 | "Inserted for TR Reigster!!\n"); | |
435 | goto out; | |
436 | } | |
437 | } | |
438 | } | |
439 | ||
440 | for (i = IA64_TR_ALLOC_BASE; i < per_cpu(ia64_tr_num, cpu); i++) { | |
441 | switch (target_mask & 0x3) { | |
442 | case 1: | |
443 | if (!(__per_cpu_idtrs[cpu][0][i].pte & 0x1)) | |
444 | goto found; | |
445 | continue; | |
446 | case 2: | |
447 | if (!(__per_cpu_idtrs[cpu][1][i].pte & 0x1)) | |
448 | goto found; | |
449 | continue; | |
450 | case 3: | |
451 | if (!(__per_cpu_idtrs[cpu][0][i].pte & 0x1) && | |
452 | !(__per_cpu_idtrs[cpu][1][i].pte & 0x1)) | |
453 | goto found; | |
454 | continue; | |
455 | default: | |
456 | r = -EINVAL; | |
457 | goto out; | |
458 | } | |
459 | } | |
460 | found: | |
461 | if (i >= per_cpu(ia64_tr_num, cpu)) | |
462 | return -EBUSY; | |
463 | ||
464 | /*Record tr info for mca hander use!*/ | |
465 | if (i > per_cpu(ia64_tr_used, cpu)) | |
466 | per_cpu(ia64_tr_used, cpu) = i; | |
467 | ||
468 | psr = ia64_clear_ic(); | |
469 | if (target_mask & 0x1) { | |
470 | ia64_itr(0x1, i, va, pte, log_size); | |
471 | ia64_srlz_i(); | |
472 | p = &__per_cpu_idtrs[cpu][0][i]; | |
473 | p->ifa = va; | |
474 | p->pte = pte; | |
475 | p->itir = log_size << 2; | |
476 | p->rr = ia64_get_rr(va); | |
477 | } | |
478 | if (target_mask & 0x2) { | |
479 | ia64_itr(0x2, i, va, pte, log_size); | |
480 | ia64_srlz_i(); | |
481 | p = &__per_cpu_idtrs[cpu][1][i]; | |
482 | p->ifa = va; | |
483 | p->pte = pte; | |
484 | p->itir = log_size << 2; | |
485 | p->rr = ia64_get_rr(va); | |
486 | } | |
487 | ia64_set_psr(psr); | |
488 | r = i; | |
489 | out: | |
490 | return r; | |
491 | } | |
492 | EXPORT_SYMBOL_GPL(ia64_itr_entry); | |
493 | ||
494 | /* | |
495 | * ia64_purge_tr | |
496 | * | |
497 | * target_mask: 0x1: purge itr, 0x2 : purge dtr, 0x3 purge idtr. | |
498 | * slot: slot number to be freed. | |
499 | * | |
500 | * Must be called with preemption disabled. | |
501 | */ | |
502 | void ia64_ptr_entry(u64 target_mask, int slot) | |
503 | { | |
504 | int cpu = smp_processor_id(); | |
505 | int i; | |
506 | struct ia64_tr_entry *p; | |
507 | ||
508 | if (slot < IA64_TR_ALLOC_BASE || slot >= per_cpu(ia64_tr_num, cpu)) | |
509 | return; | |
510 | ||
511 | if (target_mask & 0x1) { | |
512 | p = &__per_cpu_idtrs[cpu][0][slot]; | |
513 | if ((p->pte&0x1) && is_tr_overlap(p, p->ifa, p->itir>>2)) { | |
514 | p->pte = 0; | |
515 | ia64_ptr(0x1, p->ifa, p->itir>>2); | |
516 | ia64_srlz_i(); | |
517 | } | |
518 | } | |
519 | ||
520 | if (target_mask & 0x2) { | |
521 | p = &__per_cpu_idtrs[cpu][1][slot]; | |
522 | if ((p->pte & 0x1) && is_tr_overlap(p, p->ifa, p->itir>>2)) { | |
523 | p->pte = 0; | |
524 | ia64_ptr(0x2, p->ifa, p->itir>>2); | |
525 | ia64_srlz_i(); | |
526 | } | |
527 | } | |
528 | ||
529 | for (i = per_cpu(ia64_tr_used, cpu); i >= IA64_TR_ALLOC_BASE; i--) { | |
530 | if ((__per_cpu_idtrs[cpu][0][i].pte & 0x1) || | |
531 | (__per_cpu_idtrs[cpu][1][i].pte & 0x1)) | |
532 | break; | |
533 | } | |
534 | per_cpu(ia64_tr_used, cpu) = i; | |
1da177e4 | 535 | } |
96651896 | 536 | EXPORT_SYMBOL_GPL(ia64_ptr_entry); |