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11#include <linux/kernel.h>
12#include <linux/sched.h>
13#include <linux/smp.h>
14#include <linux/mm.h>
15#include <linux/proc_fs.h>
16
17#include <asm/bugs.h>
18#include <asm/cacheops.h>
19#include <asm/cpu-type.h>
20#include <asm/inst.h>
21#include <asm/io.h>
22#include <asm/page.h>
23#include <asm/prefetch.h>
24#include <asm/bootinfo.h>
25#include <asm/mipsregs.h>
26#include <asm/mmu_context.h>
27#include <asm/cpu.h>
28#include <asm/war.h>
29
30#ifdef CONFIG_SIBYTE_DMA_PAGEOPS
31#include <asm/sibyte/sb1250.h>
32#include <asm/sibyte/sb1250_regs.h>
33#include <asm/sibyte/sb1250_dma.h>
34#endif
35
36#include <asm/uasm.h>
37
38
39#define ZERO 0
40#define AT 2
41#define A0 4
42#define A1 5
43#define A2 6
44#define T0 8
45#define T1 9
46#define T2 10
47#define T3 11
48#define T9 25
49#define RA 31
50
51
52enum label_id {
53 label_clear_nopref = 1,
54 label_clear_pref,
55 label_copy_nopref,
56 label_copy_pref_both,
57 label_copy_pref_store,
58};
59
60UASM_L_LA(_clear_nopref)
61UASM_L_LA(_clear_pref)
62UASM_L_LA(_copy_nopref)
63UASM_L_LA(_copy_pref_both)
64UASM_L_LA(_copy_pref_store)
65
66
67static struct uasm_label labels[5];
68static struct uasm_reloc relocs[5];
69
70#define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
71#define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
72
73
74
75
76
77#define _uasm_i_pref(a, b, c, d) \
78do { \
79 if (cpu_has_mips_r6) { \
80 if (c <= 0xff && c >= -0x100) \
81 uasm_i_pref(a, b, c, d);\
82 } else { \
83 uasm_i_pref(a, b, c, d); \
84 } \
85} while(0)
86
87static int pref_bias_clear_store;
88static int pref_bias_copy_load;
89static int pref_bias_copy_store;
90
91static u32 pref_src_mode;
92static u32 pref_dst_mode;
93
94static int clear_word_size;
95static int copy_word_size;
96
97static int half_clear_loop_size;
98static int half_copy_loop_size;
99
100static int cache_line_size;
101#define cache_line_mask() (cache_line_size - 1)
102
103static inline void
104pg_addiu(u32 **buf, unsigned int reg1, unsigned int reg2, unsigned int off)
105{
106 if (cpu_has_64bit_gp_regs && DADDI_WAR && r4k_daddiu_bug()) {
107 if (off > 0x7fff) {
108 uasm_i_lui(buf, T9, uasm_rel_hi(off));
109 uasm_i_addiu(buf, T9, T9, uasm_rel_lo(off));
110 } else
111 uasm_i_addiu(buf, T9, ZERO, off);
112 uasm_i_daddu(buf, reg1, reg2, T9);
113 } else {
114 if (off > 0x7fff) {
115 uasm_i_lui(buf, T9, uasm_rel_hi(off));
116 uasm_i_addiu(buf, T9, T9, uasm_rel_lo(off));
117 UASM_i_ADDU(buf, reg1, reg2, T9);
118 } else
119 UASM_i_ADDIU(buf, reg1, reg2, off);
120 }
121}
122
123static void set_prefetch_parameters(void)
124{
125 if (cpu_has_64bit_gp_regs || cpu_has_64bit_zero_reg)
126 clear_word_size = 8;
127 else
128 clear_word_size = 4;
129
130 if (cpu_has_64bit_gp_regs)
131 copy_word_size = 8;
132 else
133 copy_word_size = 4;
134
135
136
137
138
139
140
141
142 if (cpu_has_prefetch) {
143
144
145
146
147 cache_line_size = cpu_dcache_line_size();
148 switch (current_cpu_type()) {
149 case CPU_R5500:
150 case CPU_TX49XX:
151
152 pref_bias_copy_load = 256;
153 break;
154
155 case CPU_R10000:
156 case CPU_R12000:
157 case CPU_R14000:
158 case CPU_R16000:
159
160
161
162
163 pref_bias_clear_store = 512;
164 pref_bias_copy_load = 256;
165 pref_bias_copy_store = 256;
166 pref_src_mode = Pref_LoadStreamed;
167 pref_dst_mode = Pref_StoreStreamed;
168 break;
169
170 case CPU_SB1:
171 case CPU_SB1A:
172 pref_bias_clear_store = 128;
173 pref_bias_copy_load = 128;
174 pref_bias_copy_store = 128;
175
176
177
178
179 if (current_cpu_type() == CPU_SB1 &&
180 (current_cpu_data.processor_id & 0xff) < 0x02) {
181 pref_src_mode = Pref_Load;
182 pref_dst_mode = Pref_Store;
183 } else {
184 pref_src_mode = Pref_LoadStreamed;
185 pref_dst_mode = Pref_StoreStreamed;
186 }
187 break;
188
189 case CPU_LOONGSON64:
190
191 pref_bias_clear_store = 128;
192 pref_bias_copy_load = 128;
193 pref_bias_copy_store = 128;
194 pref_src_mode = Pref_Load;
195 pref_dst_mode = Pref_Store;
196 break;
197
198 default:
199 pref_bias_clear_store = 128;
200 pref_bias_copy_load = 256;
201 pref_bias_copy_store = 128;
202 pref_src_mode = Pref_LoadStreamed;
203 if (cpu_has_mips_r6)
204
205
206
207
208
209 pref_dst_mode = Pref_StoreStreamed;
210 else
211 pref_dst_mode = Pref_PrepareForStore;
212 break;
213 }
214 } else {
215 if (cpu_has_cache_cdex_s)
216 cache_line_size = cpu_scache_line_size();
217 else if (cpu_has_cache_cdex_p)
218 cache_line_size = cpu_dcache_line_size();
219 }
220
221
222
223
224 half_clear_loop_size = min(16 * clear_word_size,
225 max(cache_line_size >> 1,
226 4 * clear_word_size));
227 half_copy_loop_size = min(16 * copy_word_size,
228 max(cache_line_size >> 1,
229 4 * copy_word_size));
230}
231
232static void build_clear_store(u32 **buf, int off)
233{
234 if (cpu_has_64bit_gp_regs || cpu_has_64bit_zero_reg) {
235 uasm_i_sd(buf, ZERO, off, A0);
236 } else {
237 uasm_i_sw(buf, ZERO, off, A0);
238 }
239}
240
241static inline void build_clear_pref(u32 **buf, int off)
242{
243 if (off & cache_line_mask())
244 return;
245
246 if (pref_bias_clear_store) {
247 _uasm_i_pref(buf, pref_dst_mode, pref_bias_clear_store + off,
248 A0);
249 } else if (cache_line_size == (half_clear_loop_size << 1)) {
250 if (cpu_has_cache_cdex_s) {
251 uasm_i_cache(buf, Create_Dirty_Excl_SD, off, A0);
252 } else if (cpu_has_cache_cdex_p) {
253 if (IS_ENABLED(CONFIG_WAR_R4600_V1_HIT_CACHEOP) &&
254 cpu_is_r4600_v1_x()) {
255 uasm_i_nop(buf);
256 uasm_i_nop(buf);
257 uasm_i_nop(buf);
258 uasm_i_nop(buf);
259 }
260
261 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) &&
262 cpu_is_r4600_v2_x())
263 uasm_i_lw(buf, ZERO, ZERO, AT);
264
265 uasm_i_cache(buf, Create_Dirty_Excl_D, off, A0);
266 }
267 }
268}
269
270extern u32 __clear_page_start;
271extern u32 __clear_page_end;
272extern u32 __copy_page_start;
273extern u32 __copy_page_end;
274
275void build_clear_page(void)
276{
277 int off;
278 u32 *buf = &__clear_page_start;
279 struct uasm_label *l = labels;
280 struct uasm_reloc *r = relocs;
281 int i;
282 static atomic_t run_once = ATOMIC_INIT(0);
283
284 if (atomic_xchg(&run_once, 1)) {
285 return;
286 }
287
288 memset(labels, 0, sizeof(labels));
289 memset(relocs, 0, sizeof(relocs));
290
291 set_prefetch_parameters();
292
293
294
295
296
297
298 BUG_ON(pref_bias_clear_store % (2 * clear_word_size));
299 BUG_ON(PAGE_SIZE < pref_bias_clear_store);
300
301 off = PAGE_SIZE - pref_bias_clear_store;
302 if (off > 0xffff || !pref_bias_clear_store)
303 pg_addiu(&buf, A2, A0, off);
304 else
305 uasm_i_ori(&buf, A2, A0, off);
306
307 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) && cpu_is_r4600_v2_x())
308 uasm_i_lui(&buf, AT, uasm_rel_hi(0xa0000000));
309
310 off = cache_line_size ? min(8, pref_bias_clear_store / cache_line_size)
311 * cache_line_size : 0;
312 while (off) {
313 build_clear_pref(&buf, -off);
314 off -= cache_line_size;
315 }
316 uasm_l_clear_pref(&l, buf);
317 do {
318 build_clear_pref(&buf, off);
319 build_clear_store(&buf, off);
320 off += clear_word_size;
321 } while (off < half_clear_loop_size);
322 pg_addiu(&buf, A0, A0, 2 * off);
323 off = -off;
324 do {
325 build_clear_pref(&buf, off);
326 if (off == -clear_word_size)
327 uasm_il_bne(&buf, &r, A0, A2, label_clear_pref);
328 build_clear_store(&buf, off);
329 off += clear_word_size;
330 } while (off < 0);
331
332 if (pref_bias_clear_store) {
333 pg_addiu(&buf, A2, A0, pref_bias_clear_store);
334 uasm_l_clear_nopref(&l, buf);
335 off = 0;
336 do {
337 build_clear_store(&buf, off);
338 off += clear_word_size;
339 } while (off < half_clear_loop_size);
340 pg_addiu(&buf, A0, A0, 2 * off);
341 off = -off;
342 do {
343 if (off == -clear_word_size)
344 uasm_il_bne(&buf, &r, A0, A2,
345 label_clear_nopref);
346 build_clear_store(&buf, off);
347 off += clear_word_size;
348 } while (off < 0);
349 }
350
351 uasm_i_jr(&buf, RA);
352 uasm_i_nop(&buf);
353
354 BUG_ON(buf > &__clear_page_end);
355
356 uasm_resolve_relocs(relocs, labels);
357
358 pr_debug("Synthesized clear page handler (%u instructions).\n",
359 (u32)(buf - &__clear_page_start));
360
361 pr_debug("\t.set push\n");
362 pr_debug("\t.set noreorder\n");
363 for (i = 0; i < (buf - &__clear_page_start); i++)
364 pr_debug("\t.word 0x%08x\n", (&__clear_page_start)[i]);
365 pr_debug("\t.set pop\n");
366}
367
368static void build_copy_load(u32 **buf, int reg, int off)
369{
370 if (cpu_has_64bit_gp_regs) {
371 uasm_i_ld(buf, reg, off, A1);
372 } else {
373 uasm_i_lw(buf, reg, off, A1);
374 }
375}
376
377static void build_copy_store(u32 **buf, int reg, int off)
378{
379 if (cpu_has_64bit_gp_regs) {
380 uasm_i_sd(buf, reg, off, A0);
381 } else {
382 uasm_i_sw(buf, reg, off, A0);
383 }
384}
385
386static inline void build_copy_load_pref(u32 **buf, int off)
387{
388 if (off & cache_line_mask())
389 return;
390
391 if (pref_bias_copy_load)
392 _uasm_i_pref(buf, pref_src_mode, pref_bias_copy_load + off, A1);
393}
394
395static inline void build_copy_store_pref(u32 **buf, int off)
396{
397 if (off & cache_line_mask())
398 return;
399
400 if (pref_bias_copy_store) {
401 _uasm_i_pref(buf, pref_dst_mode, pref_bias_copy_store + off,
402 A0);
403 } else if (cache_line_size == (half_copy_loop_size << 1)) {
404 if (cpu_has_cache_cdex_s) {
405 uasm_i_cache(buf, Create_Dirty_Excl_SD, off, A0);
406 } else if (cpu_has_cache_cdex_p) {
407 if (IS_ENABLED(CONFIG_WAR_R4600_V1_HIT_CACHEOP) &&
408 cpu_is_r4600_v1_x()) {
409 uasm_i_nop(buf);
410 uasm_i_nop(buf);
411 uasm_i_nop(buf);
412 uasm_i_nop(buf);
413 }
414
415 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) &&
416 cpu_is_r4600_v2_x())
417 uasm_i_lw(buf, ZERO, ZERO, AT);
418
419 uasm_i_cache(buf, Create_Dirty_Excl_D, off, A0);
420 }
421 }
422}
423
424void build_copy_page(void)
425{
426 int off;
427 u32 *buf = &__copy_page_start;
428 struct uasm_label *l = labels;
429 struct uasm_reloc *r = relocs;
430 int i;
431 static atomic_t run_once = ATOMIC_INIT(0);
432
433 if (atomic_xchg(&run_once, 1)) {
434 return;
435 }
436
437 memset(labels, 0, sizeof(labels));
438 memset(relocs, 0, sizeof(relocs));
439
440 set_prefetch_parameters();
441
442
443
444
445
446
447
448
449 BUG_ON(pref_bias_copy_load % (8 * copy_word_size));
450 BUG_ON(pref_bias_copy_store % (8 * copy_word_size));
451 BUG_ON(PAGE_SIZE < pref_bias_copy_load);
452 BUG_ON(pref_bias_copy_store > pref_bias_copy_load);
453
454 off = PAGE_SIZE - pref_bias_copy_load;
455 if (off > 0xffff || !pref_bias_copy_load)
456 pg_addiu(&buf, A2, A0, off);
457 else
458 uasm_i_ori(&buf, A2, A0, off);
459
460 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) && cpu_is_r4600_v2_x())
461 uasm_i_lui(&buf, AT, uasm_rel_hi(0xa0000000));
462
463 off = cache_line_size ? min(8, pref_bias_copy_load / cache_line_size) *
464 cache_line_size : 0;
465 while (off) {
466 build_copy_load_pref(&buf, -off);
467 off -= cache_line_size;
468 }
469 off = cache_line_size ? min(8, pref_bias_copy_store / cache_line_size) *
470 cache_line_size : 0;
471 while (off) {
472 build_copy_store_pref(&buf, -off);
473 off -= cache_line_size;
474 }
475 uasm_l_copy_pref_both(&l, buf);
476 do {
477 build_copy_load_pref(&buf, off);
478 build_copy_load(&buf, T0, off);
479 build_copy_load_pref(&buf, off + copy_word_size);
480 build_copy_load(&buf, T1, off + copy_word_size);
481 build_copy_load_pref(&buf, off + 2 * copy_word_size);
482 build_copy_load(&buf, T2, off + 2 * copy_word_size);
483 build_copy_load_pref(&buf, off + 3 * copy_word_size);
484 build_copy_load(&buf, T3, off + 3 * copy_word_size);
485 build_copy_store_pref(&buf, off);
486 build_copy_store(&buf, T0, off);
487 build_copy_store_pref(&buf, off + copy_word_size);
488 build_copy_store(&buf, T1, off + copy_word_size);
489 build_copy_store_pref(&buf, off + 2 * copy_word_size);
490 build_copy_store(&buf, T2, off + 2 * copy_word_size);
491 build_copy_store_pref(&buf, off + 3 * copy_word_size);
492 build_copy_store(&buf, T3, off + 3 * copy_word_size);
493 off += 4 * copy_word_size;
494 } while (off < half_copy_loop_size);
495 pg_addiu(&buf, A1, A1, 2 * off);
496 pg_addiu(&buf, A0, A0, 2 * off);
497 off = -off;
498 do {
499 build_copy_load_pref(&buf, off);
500 build_copy_load(&buf, T0, off);
501 build_copy_load_pref(&buf, off + copy_word_size);
502 build_copy_load(&buf, T1, off + copy_word_size);
503 build_copy_load_pref(&buf, off + 2 * copy_word_size);
504 build_copy_load(&buf, T2, off + 2 * copy_word_size);
505 build_copy_load_pref(&buf, off + 3 * copy_word_size);
506 build_copy_load(&buf, T3, off + 3 * copy_word_size);
507 build_copy_store_pref(&buf, off);
508 build_copy_store(&buf, T0, off);
509 build_copy_store_pref(&buf, off + copy_word_size);
510 build_copy_store(&buf, T1, off + copy_word_size);
511 build_copy_store_pref(&buf, off + 2 * copy_word_size);
512 build_copy_store(&buf, T2, off + 2 * copy_word_size);
513 build_copy_store_pref(&buf, off + 3 * copy_word_size);
514 if (off == -(4 * copy_word_size))
515 uasm_il_bne(&buf, &r, A2, A0, label_copy_pref_both);
516 build_copy_store(&buf, T3, off + 3 * copy_word_size);
517 off += 4 * copy_word_size;
518 } while (off < 0);
519
520 if (pref_bias_copy_load - pref_bias_copy_store) {
521 pg_addiu(&buf, A2, A0,
522 pref_bias_copy_load - pref_bias_copy_store);
523 uasm_l_copy_pref_store(&l, buf);
524 off = 0;
525 do {
526 build_copy_load(&buf, T0, off);
527 build_copy_load(&buf, T1, off + copy_word_size);
528 build_copy_load(&buf, T2, off + 2 * copy_word_size);
529 build_copy_load(&buf, T3, off + 3 * copy_word_size);
530 build_copy_store_pref(&buf, off);
531 build_copy_store(&buf, T0, off);
532 build_copy_store_pref(&buf, off + copy_word_size);
533 build_copy_store(&buf, T1, off + copy_word_size);
534 build_copy_store_pref(&buf, off + 2 * copy_word_size);
535 build_copy_store(&buf, T2, off + 2 * copy_word_size);
536 build_copy_store_pref(&buf, off + 3 * copy_word_size);
537 build_copy_store(&buf, T3, off + 3 * copy_word_size);
538 off += 4 * copy_word_size;
539 } while (off < half_copy_loop_size);
540 pg_addiu(&buf, A1, A1, 2 * off);
541 pg_addiu(&buf, A0, A0, 2 * off);
542 off = -off;
543 do {
544 build_copy_load(&buf, T0, off);
545 build_copy_load(&buf, T1, off + copy_word_size);
546 build_copy_load(&buf, T2, off + 2 * copy_word_size);
547 build_copy_load(&buf, T3, off + 3 * copy_word_size);
548 build_copy_store_pref(&buf, off);
549 build_copy_store(&buf, T0, off);
550 build_copy_store_pref(&buf, off + copy_word_size);
551 build_copy_store(&buf, T1, off + copy_word_size);
552 build_copy_store_pref(&buf, off + 2 * copy_word_size);
553 build_copy_store(&buf, T2, off + 2 * copy_word_size);
554 build_copy_store_pref(&buf, off + 3 * copy_word_size);
555 if (off == -(4 * copy_word_size))
556 uasm_il_bne(&buf, &r, A2, A0,
557 label_copy_pref_store);
558 build_copy_store(&buf, T3, off + 3 * copy_word_size);
559 off += 4 * copy_word_size;
560 } while (off < 0);
561 }
562
563 if (pref_bias_copy_store) {
564 pg_addiu(&buf, A2, A0, pref_bias_copy_store);
565 uasm_l_copy_nopref(&l, buf);
566 off = 0;
567 do {
568 build_copy_load(&buf, T0, off);
569 build_copy_load(&buf, T1, off + copy_word_size);
570 build_copy_load(&buf, T2, off + 2 * copy_word_size);
571 build_copy_load(&buf, T3, off + 3 * copy_word_size);
572 build_copy_store(&buf, T0, off);
573 build_copy_store(&buf, T1, off + copy_word_size);
574 build_copy_store(&buf, T2, off + 2 * copy_word_size);
575 build_copy_store(&buf, T3, off + 3 * copy_word_size);
576 off += 4 * copy_word_size;
577 } while (off < half_copy_loop_size);
578 pg_addiu(&buf, A1, A1, 2 * off);
579 pg_addiu(&buf, A0, A0, 2 * off);
580 off = -off;
581 do {
582 build_copy_load(&buf, T0, off);
583 build_copy_load(&buf, T1, off + copy_word_size);
584 build_copy_load(&buf, T2, off + 2 * copy_word_size);
585 build_copy_load(&buf, T3, off + 3 * copy_word_size);
586 build_copy_store(&buf, T0, off);
587 build_copy_store(&buf, T1, off + copy_word_size);
588 build_copy_store(&buf, T2, off + 2 * copy_word_size);
589 if (off == -(4 * copy_word_size))
590 uasm_il_bne(&buf, &r, A2, A0,
591 label_copy_nopref);
592 build_copy_store(&buf, T3, off + 3 * copy_word_size);
593 off += 4 * copy_word_size;
594 } while (off < 0);
595 }
596
597 uasm_i_jr(&buf, RA);
598 uasm_i_nop(&buf);
599
600 BUG_ON(buf > &__copy_page_end);
601
602 uasm_resolve_relocs(relocs, labels);
603
604 pr_debug("Synthesized copy page handler (%u instructions).\n",
605 (u32)(buf - &__copy_page_start));
606
607 pr_debug("\t.set push\n");
608 pr_debug("\t.set noreorder\n");
609 for (i = 0; i < (buf - &__copy_page_start); i++)
610 pr_debug("\t.word 0x%08x\n", (&__copy_page_start)[i]);
611 pr_debug("\t.set pop\n");
612}
613
614#ifdef CONFIG_SIBYTE_DMA_PAGEOPS
615extern void clear_page_cpu(void *page);
616extern void copy_page_cpu(void *to, void *from);
617
618
619
620
621
622struct dmadscr {
623 u64 dscr_a;
624 u64 dscr_b;
625 u64 pad_a;
626 u64 pad_b;
627} ____cacheline_aligned_in_smp page_descr[DM_NUM_CHANNELS];
628
629void clear_page(void *page)
630{
631 u64 to_phys = CPHYSADDR((unsigned long)page);
632 unsigned int cpu = smp_processor_id();
633
634
635 if ((long)KSEGX((unsigned long)page) != (long)CKSEG0)
636 return clear_page_cpu(page);
637
638 page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_ZERO_MEM |
639 M_DM_DSCRA_L2C_DEST | M_DM_DSCRA_INTERRUPT;
640 page_descr[cpu].dscr_b = V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE);
641 __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT)));
642
643
644
645
646
647 while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG)))
648 & M_DM_DSCR_BASE_INTERRUPT))
649 ;
650 __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE)));
651}
652EXPORT_SYMBOL(clear_page);
653
654void copy_page(void *to, void *from)
655{
656 u64 from_phys = CPHYSADDR((unsigned long)from);
657 u64 to_phys = CPHYSADDR((unsigned long)to);
658 unsigned int cpu = smp_processor_id();
659
660
661 if ((long)KSEGX((unsigned long)to) != (long)CKSEG0
662 || (long)KSEGX((unsigned long)from) != (long)CKSEG0)
663 return copy_page_cpu(to, from);
664
665 page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_L2C_DEST |
666 M_DM_DSCRA_INTERRUPT;
667 page_descr[cpu].dscr_b = from_phys | V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE);
668 __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT)));
669
670
671
672
673
674 while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG)))
675 & M_DM_DSCR_BASE_INTERRUPT))
676 ;
677 __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE)));
678}
679EXPORT_SYMBOL(copy_page);
680
681#endif
682
