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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
29#ifdef CONFIG_SIBYTE_DMA_PAGEOPS
30#include <asm/sibyte/sb1250.h>
31#include <asm/sibyte/sb1250_regs.h>
32#include <asm/sibyte/sb1250_dma.h>
33#endif
34
35#include <asm/uasm.h>
36
37
38#define ZERO 0
39#define AT 2
40#define A0 4
41#define A1 5
42#define A2 6
43#define T0 8
44#define T1 9
45#define T2 10
46#define T3 11
47#define T9 25
48#define RA 31
49
50
51enum label_id {
52 label_clear_nopref = 1,
53 label_clear_pref,
54 label_copy_nopref,
55 label_copy_pref_both,
56 label_copy_pref_store,
57};
58
59UASM_L_LA(_clear_nopref)
60UASM_L_LA(_clear_pref)
61UASM_L_LA(_copy_nopref)
62UASM_L_LA(_copy_pref_both)
63UASM_L_LA(_copy_pref_store)
64
65
66static struct uasm_label labels[5];
67static struct uasm_reloc relocs[5];
68
69#define cpu_is_r4600_v1_x() ((read_c0_prid() & 0xfffffff0) == 0x00002010)
70#define cpu_is_r4600_v2_x() ((read_c0_prid() & 0xfffffff0) == 0x00002020)
71
72
73
74
75
76#define _uasm_i_pref(a, b, c, d) \
77do { \
78 if (cpu_has_mips_r6) { \
79 if (c <= 0xff && c >= -0x100) \
80 uasm_i_pref(a, b, c, d);\
81 } else { \
82 uasm_i_pref(a, b, c, d); \
83 } \
84} while(0)
85
86static int pref_bias_clear_store;
87static int pref_bias_copy_load;
88static int pref_bias_copy_store;
89
90static u32 pref_src_mode;
91static u32 pref_dst_mode;
92
93static int clear_word_size;
94static int copy_word_size;
95
96static int half_clear_loop_size;
97static int half_copy_loop_size;
98
99static int cache_line_size;
100#define cache_line_mask() (cache_line_size - 1)
101
102static inline void
103pg_addiu(u32 **buf, unsigned int reg1, unsigned int reg2, unsigned int off)
104{
105 if (cpu_has_64bit_gp_regs &&
106 IS_ENABLED(CONFIG_CPU_DADDI_WORKAROUNDS) &&
107 r4k_daddiu_bug()) {
108 if (off > 0x7fff) {
109 uasm_i_lui(buf, T9, uasm_rel_hi(off));
110 uasm_i_addiu(buf, T9, T9, uasm_rel_lo(off));
111 } else
112 uasm_i_addiu(buf, T9, ZERO, off);
113 uasm_i_daddu(buf, reg1, reg2, T9);
114 } else {
115 if (off > 0x7fff) {
116 uasm_i_lui(buf, T9, uasm_rel_hi(off));
117 uasm_i_addiu(buf, T9, T9, uasm_rel_lo(off));
118 UASM_i_ADDU(buf, reg1, reg2, T9);
119 } else
120 UASM_i_ADDIU(buf, reg1, reg2, off);
121 }
122}
123
124static void set_prefetch_parameters(void)
125{
126 if (cpu_has_64bit_gp_regs || cpu_has_64bit_zero_reg)
127 clear_word_size = 8;
128 else
129 clear_word_size = 4;
130
131 if (cpu_has_64bit_gp_regs)
132 copy_word_size = 8;
133 else
134 copy_word_size = 4;
135
136
137
138
139
140
141
142
143 if (cpu_has_prefetch) {
144
145
146
147
148 cache_line_size = cpu_dcache_line_size();
149 switch (current_cpu_type()) {
150 case CPU_R5500:
151 case CPU_TX49XX:
152
153 pref_bias_copy_load = 256;
154 break;
155
156 case CPU_R10000:
157 case CPU_R12000:
158 case CPU_R14000:
159 case CPU_R16000:
160
161
162
163
164 pref_bias_clear_store = 512;
165 pref_bias_copy_load = 256;
166 pref_bias_copy_store = 256;
167 pref_src_mode = Pref_LoadStreamed;
168 pref_dst_mode = Pref_StoreStreamed;
169 break;
170
171 case CPU_SB1:
172 case CPU_SB1A:
173 pref_bias_clear_store = 128;
174 pref_bias_copy_load = 128;
175 pref_bias_copy_store = 128;
176
177
178
179
180 if (current_cpu_type() == CPU_SB1 &&
181 (current_cpu_data.processor_id & 0xff) < 0x02) {
182 pref_src_mode = Pref_Load;
183 pref_dst_mode = Pref_Store;
184 } else {
185 pref_src_mode = Pref_LoadStreamed;
186 pref_dst_mode = Pref_StoreStreamed;
187 }
188 break;
189
190 case CPU_LOONGSON64:
191
192 pref_bias_clear_store = 128;
193 pref_bias_copy_load = 128;
194 pref_bias_copy_store = 128;
195 pref_src_mode = Pref_Load;
196 pref_dst_mode = Pref_Store;
197 break;
198
199 default:
200 pref_bias_clear_store = 128;
201 pref_bias_copy_load = 256;
202 pref_bias_copy_store = 128;
203 pref_src_mode = Pref_LoadStreamed;
204 if (cpu_has_mips_r6)
205
206
207
208
209
210 pref_dst_mode = Pref_StoreStreamed;
211 else
212 pref_dst_mode = Pref_PrepareForStore;
213 break;
214 }
215 } else {
216 if (cpu_has_cache_cdex_s)
217 cache_line_size = cpu_scache_line_size();
218 else if (cpu_has_cache_cdex_p)
219 cache_line_size = cpu_dcache_line_size();
220 }
221
222
223
224
225 half_clear_loop_size = min(16 * clear_word_size,
226 max(cache_line_size >> 1,
227 4 * clear_word_size));
228 half_copy_loop_size = min(16 * copy_word_size,
229 max(cache_line_size >> 1,
230 4 * copy_word_size));
231}
232
233static void build_clear_store(u32 **buf, int off)
234{
235 if (cpu_has_64bit_gp_regs || cpu_has_64bit_zero_reg) {
236 uasm_i_sd(buf, ZERO, off, A0);
237 } else {
238 uasm_i_sw(buf, ZERO, off, A0);
239 }
240}
241
242static inline void build_clear_pref(u32 **buf, int off)
243{
244 if (off & cache_line_mask())
245 return;
246
247 if (pref_bias_clear_store) {
248 _uasm_i_pref(buf, pref_dst_mode, pref_bias_clear_store + off,
249 A0);
250 } else if (cache_line_size == (half_clear_loop_size << 1)) {
251 if (cpu_has_cache_cdex_s) {
252 uasm_i_cache(buf, Create_Dirty_Excl_SD, off, A0);
253 } else if (cpu_has_cache_cdex_p) {
254 if (IS_ENABLED(CONFIG_WAR_R4600_V1_HIT_CACHEOP) &&
255 cpu_is_r4600_v1_x()) {
256 uasm_i_nop(buf);
257 uasm_i_nop(buf);
258 uasm_i_nop(buf);
259 uasm_i_nop(buf);
260 }
261
262 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) &&
263 cpu_is_r4600_v2_x())
264 uasm_i_lw(buf, ZERO, ZERO, AT);
265
266 uasm_i_cache(buf, Create_Dirty_Excl_D, off, A0);
267 }
268 }
269}
270
271extern u32 __clear_page_start;
272extern u32 __clear_page_end;
273extern u32 __copy_page_start;
274extern u32 __copy_page_end;
275
276void build_clear_page(void)
277{
278 int off;
279 u32 *buf = &__clear_page_start;
280 struct uasm_label *l = labels;
281 struct uasm_reloc *r = relocs;
282 int i;
283 static atomic_t run_once = ATOMIC_INIT(0);
284
285 if (atomic_xchg(&run_once, 1)) {
286 return;
287 }
288
289 memset(labels, 0, sizeof(labels));
290 memset(relocs, 0, sizeof(relocs));
291
292 set_prefetch_parameters();
293
294
295
296
297
298
299 BUG_ON(pref_bias_clear_store % (2 * clear_word_size));
300 BUG_ON(PAGE_SIZE < pref_bias_clear_store);
301
302 off = PAGE_SIZE - pref_bias_clear_store;
303 if (off > 0xffff || !pref_bias_clear_store)
304 pg_addiu(&buf, A2, A0, off);
305 else
306 uasm_i_ori(&buf, A2, A0, off);
307
308 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) && cpu_is_r4600_v2_x())
309 uasm_i_lui(&buf, AT, uasm_rel_hi(0xa0000000));
310
311 off = cache_line_size ? min(8, pref_bias_clear_store / cache_line_size)
312 * cache_line_size : 0;
313 while (off) {
314 build_clear_pref(&buf, -off);
315 off -= cache_line_size;
316 }
317 uasm_l_clear_pref(&l, buf);
318 do {
319 build_clear_pref(&buf, off);
320 build_clear_store(&buf, off);
321 off += clear_word_size;
322 } while (off < half_clear_loop_size);
323 pg_addiu(&buf, A0, A0, 2 * off);
324 off = -off;
325 do {
326 build_clear_pref(&buf, off);
327 if (off == -clear_word_size)
328 uasm_il_bne(&buf, &r, A0, A2, label_clear_pref);
329 build_clear_store(&buf, off);
330 off += clear_word_size;
331 } while (off < 0);
332
333 if (pref_bias_clear_store) {
334 pg_addiu(&buf, A2, A0, pref_bias_clear_store);
335 uasm_l_clear_nopref(&l, buf);
336 off = 0;
337 do {
338 build_clear_store(&buf, off);
339 off += clear_word_size;
340 } while (off < half_clear_loop_size);
341 pg_addiu(&buf, A0, A0, 2 * off);
342 off = -off;
343 do {
344 if (off == -clear_word_size)
345 uasm_il_bne(&buf, &r, A0, A2,
346 label_clear_nopref);
347 build_clear_store(&buf, off);
348 off += clear_word_size;
349 } while (off < 0);
350 }
351
352 uasm_i_jr(&buf, RA);
353 uasm_i_nop(&buf);
354
355 BUG_ON(buf > &__clear_page_end);
356
357 uasm_resolve_relocs(relocs, labels);
358
359 pr_debug("Synthesized clear page handler (%u instructions).\n",
360 (u32)(buf - &__clear_page_start));
361
362 pr_debug("\t.set push\n");
363 pr_debug("\t.set noreorder\n");
364 for (i = 0; i < (buf - &__clear_page_start); i++)
365 pr_debug("\t.word 0x%08x\n", (&__clear_page_start)[i]);
366 pr_debug("\t.set pop\n");
367}
368
369static void build_copy_load(u32 **buf, int reg, int off)
370{
371 if (cpu_has_64bit_gp_regs) {
372 uasm_i_ld(buf, reg, off, A1);
373 } else {
374 uasm_i_lw(buf, reg, off, A1);
375 }
376}
377
378static void build_copy_store(u32 **buf, int reg, int off)
379{
380 if (cpu_has_64bit_gp_regs) {
381 uasm_i_sd(buf, reg, off, A0);
382 } else {
383 uasm_i_sw(buf, reg, off, A0);
384 }
385}
386
387static inline void build_copy_load_pref(u32 **buf, int off)
388{
389 if (off & cache_line_mask())
390 return;
391
392 if (pref_bias_copy_load)
393 _uasm_i_pref(buf, pref_src_mode, pref_bias_copy_load + off, A1);
394}
395
396static inline void build_copy_store_pref(u32 **buf, int off)
397{
398 if (off & cache_line_mask())
399 return;
400
401 if (pref_bias_copy_store) {
402 _uasm_i_pref(buf, pref_dst_mode, pref_bias_copy_store + off,
403 A0);
404 } else if (cache_line_size == (half_copy_loop_size << 1)) {
405 if (cpu_has_cache_cdex_s) {
406 uasm_i_cache(buf, Create_Dirty_Excl_SD, off, A0);
407 } else if (cpu_has_cache_cdex_p) {
408 if (IS_ENABLED(CONFIG_WAR_R4600_V1_HIT_CACHEOP) &&
409 cpu_is_r4600_v1_x()) {
410 uasm_i_nop(buf);
411 uasm_i_nop(buf);
412 uasm_i_nop(buf);
413 uasm_i_nop(buf);
414 }
415
416 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) &&
417 cpu_is_r4600_v2_x())
418 uasm_i_lw(buf, ZERO, ZERO, AT);
419
420 uasm_i_cache(buf, Create_Dirty_Excl_D, off, A0);
421 }
422 }
423}
424
425void build_copy_page(void)
426{
427 int off;
428 u32 *buf = &__copy_page_start;
429 struct uasm_label *l = labels;
430 struct uasm_reloc *r = relocs;
431 int i;
432 static atomic_t run_once = ATOMIC_INIT(0);
433
434 if (atomic_xchg(&run_once, 1)) {
435 return;
436 }
437
438 memset(labels, 0, sizeof(labels));
439 memset(relocs, 0, sizeof(relocs));
440
441 set_prefetch_parameters();
442
443
444
445
446
447
448
449
450 BUG_ON(pref_bias_copy_load % (8 * copy_word_size));
451 BUG_ON(pref_bias_copy_store % (8 * copy_word_size));
452 BUG_ON(PAGE_SIZE < pref_bias_copy_load);
453 BUG_ON(pref_bias_copy_store > pref_bias_copy_load);
454
455 off = PAGE_SIZE - pref_bias_copy_load;
456 if (off > 0xffff || !pref_bias_copy_load)
457 pg_addiu(&buf, A2, A0, off);
458 else
459 uasm_i_ori(&buf, A2, A0, off);
460
461 if (IS_ENABLED(CONFIG_WAR_R4600_V2_HIT_CACHEOP) && cpu_is_r4600_v2_x())
462 uasm_i_lui(&buf, AT, uasm_rel_hi(0xa0000000));
463
464 off = cache_line_size ? min(8, pref_bias_copy_load / cache_line_size) *
465 cache_line_size : 0;
466 while (off) {
467 build_copy_load_pref(&buf, -off);
468 off -= cache_line_size;
469 }
470 off = cache_line_size ? min(8, pref_bias_copy_store / cache_line_size) *
471 cache_line_size : 0;
472 while (off) {
473 build_copy_store_pref(&buf, -off);
474 off -= cache_line_size;
475 }
476 uasm_l_copy_pref_both(&l, buf);
477 do {
478 build_copy_load_pref(&buf, off);
479 build_copy_load(&buf, T0, off);
480 build_copy_load_pref(&buf, off + copy_word_size);
481 build_copy_load(&buf, T1, off + copy_word_size);
482 build_copy_load_pref(&buf, off + 2 * copy_word_size);
483 build_copy_load(&buf, T2, off + 2 * copy_word_size);
484 build_copy_load_pref(&buf, off + 3 * copy_word_size);
485 build_copy_load(&buf, T3, off + 3 * copy_word_size);
486 build_copy_store_pref(&buf, off);
487 build_copy_store(&buf, T0, off);
488 build_copy_store_pref(&buf, off + copy_word_size);
489 build_copy_store(&buf, T1, off + copy_word_size);
490 build_copy_store_pref(&buf, off + 2 * copy_word_size);
491 build_copy_store(&buf, T2, off + 2 * copy_word_size);
492 build_copy_store_pref(&buf, off + 3 * copy_word_size);
493 build_copy_store(&buf, T3, off + 3 * copy_word_size);
494 off += 4 * copy_word_size;
495 } while (off < half_copy_loop_size);
496 pg_addiu(&buf, A1, A1, 2 * off);
497 pg_addiu(&buf, A0, A0, 2 * off);
498 off = -off;
499 do {
500 build_copy_load_pref(&buf, off);
501 build_copy_load(&buf, T0, off);
502 build_copy_load_pref(&buf, off + copy_word_size);
503 build_copy_load(&buf, T1, off + copy_word_size);
504 build_copy_load_pref(&buf, off + 2 * copy_word_size);
505 build_copy_load(&buf, T2, off + 2 * copy_word_size);
506 build_copy_load_pref(&buf, off + 3 * copy_word_size);
507 build_copy_load(&buf, T3, off + 3 * copy_word_size);
508 build_copy_store_pref(&buf, off);
509 build_copy_store(&buf, T0, off);
510 build_copy_store_pref(&buf, off + copy_word_size);
511 build_copy_store(&buf, T1, off + copy_word_size);
512 build_copy_store_pref(&buf, off + 2 * copy_word_size);
513 build_copy_store(&buf, T2, off + 2 * copy_word_size);
514 build_copy_store_pref(&buf, off + 3 * copy_word_size);
515 if (off == -(4 * copy_word_size))
516 uasm_il_bne(&buf, &r, A2, A0, label_copy_pref_both);
517 build_copy_store(&buf, T3, off + 3 * copy_word_size);
518 off += 4 * copy_word_size;
519 } while (off < 0);
520
521 if (pref_bias_copy_load - pref_bias_copy_store) {
522 pg_addiu(&buf, A2, A0,
523 pref_bias_copy_load - pref_bias_copy_store);
524 uasm_l_copy_pref_store(&l, buf);
525 off = 0;
526 do {
527 build_copy_load(&buf, T0, off);
528 build_copy_load(&buf, T1, off + copy_word_size);
529 build_copy_load(&buf, T2, off + 2 * copy_word_size);
530 build_copy_load(&buf, T3, off + 3 * copy_word_size);
531 build_copy_store_pref(&buf, off);
532 build_copy_store(&buf, T0, off);
533 build_copy_store_pref(&buf, off + copy_word_size);
534 build_copy_store(&buf, T1, off + copy_word_size);
535 build_copy_store_pref(&buf, off + 2 * copy_word_size);
536 build_copy_store(&buf, T2, off + 2 * copy_word_size);
537 build_copy_store_pref(&buf, off + 3 * copy_word_size);
538 build_copy_store(&buf, T3, off + 3 * copy_word_size);
539 off += 4 * copy_word_size;
540 } while (off < half_copy_loop_size);
541 pg_addiu(&buf, A1, A1, 2 * off);
542 pg_addiu(&buf, A0, A0, 2 * off);
543 off = -off;
544 do {
545 build_copy_load(&buf, T0, off);
546 build_copy_load(&buf, T1, off + copy_word_size);
547 build_copy_load(&buf, T2, off + 2 * copy_word_size);
548 build_copy_load(&buf, T3, off + 3 * copy_word_size);
549 build_copy_store_pref(&buf, off);
550 build_copy_store(&buf, T0, off);
551 build_copy_store_pref(&buf, off + copy_word_size);
552 build_copy_store(&buf, T1, off + copy_word_size);
553 build_copy_store_pref(&buf, off + 2 * copy_word_size);
554 build_copy_store(&buf, T2, off + 2 * copy_word_size);
555 build_copy_store_pref(&buf, off + 3 * copy_word_size);
556 if (off == -(4 * copy_word_size))
557 uasm_il_bne(&buf, &r, A2, A0,
558 label_copy_pref_store);
559 build_copy_store(&buf, T3, off + 3 * copy_word_size);
560 off += 4 * copy_word_size;
561 } while (off < 0);
562 }
563
564 if (pref_bias_copy_store) {
565 pg_addiu(&buf, A2, A0, pref_bias_copy_store);
566 uasm_l_copy_nopref(&l, buf);
567 off = 0;
568 do {
569 build_copy_load(&buf, T0, off);
570 build_copy_load(&buf, T1, off + copy_word_size);
571 build_copy_load(&buf, T2, off + 2 * copy_word_size);
572 build_copy_load(&buf, T3, off + 3 * copy_word_size);
573 build_copy_store(&buf, T0, off);
574 build_copy_store(&buf, T1, off + copy_word_size);
575 build_copy_store(&buf, T2, off + 2 * copy_word_size);
576 build_copy_store(&buf, T3, off + 3 * copy_word_size);
577 off += 4 * copy_word_size;
578 } while (off < half_copy_loop_size);
579 pg_addiu(&buf, A1, A1, 2 * off);
580 pg_addiu(&buf, A0, A0, 2 * off);
581 off = -off;
582 do {
583 build_copy_load(&buf, T0, off);
584 build_copy_load(&buf, T1, off + copy_word_size);
585 build_copy_load(&buf, T2, off + 2 * copy_word_size);
586 build_copy_load(&buf, T3, off + 3 * copy_word_size);
587 build_copy_store(&buf, T0, off);
588 build_copy_store(&buf, T1, off + copy_word_size);
589 build_copy_store(&buf, T2, off + 2 * copy_word_size);
590 if (off == -(4 * copy_word_size))
591 uasm_il_bne(&buf, &r, A2, A0,
592 label_copy_nopref);
593 build_copy_store(&buf, T3, off + 3 * copy_word_size);
594 off += 4 * copy_word_size;
595 } while (off < 0);
596 }
597
598 uasm_i_jr(&buf, RA);
599 uasm_i_nop(&buf);
600
601 BUG_ON(buf > &__copy_page_end);
602
603 uasm_resolve_relocs(relocs, labels);
604
605 pr_debug("Synthesized copy page handler (%u instructions).\n",
606 (u32)(buf - &__copy_page_start));
607
608 pr_debug("\t.set push\n");
609 pr_debug("\t.set noreorder\n");
610 for (i = 0; i < (buf - &__copy_page_start); i++)
611 pr_debug("\t.word 0x%08x\n", (&__copy_page_start)[i]);
612 pr_debug("\t.set pop\n");
613}
614
615#ifdef CONFIG_SIBYTE_DMA_PAGEOPS
616extern void clear_page_cpu(void *page);
617extern void copy_page_cpu(void *to, void *from);
618
619
620
621
622
623struct dmadscr {
624 u64 dscr_a;
625 u64 dscr_b;
626 u64 pad_a;
627 u64 pad_b;
628} ____cacheline_aligned_in_smp page_descr[DM_NUM_CHANNELS];
629
630void clear_page(void *page)
631{
632 u64 to_phys = CPHYSADDR((unsigned long)page);
633 unsigned int cpu = smp_processor_id();
634
635
636 if ((long)KSEGX((unsigned long)page) != (long)CKSEG0)
637 return clear_page_cpu(page);
638
639 page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_ZERO_MEM |
640 M_DM_DSCRA_L2C_DEST | M_DM_DSCRA_INTERRUPT;
641 page_descr[cpu].dscr_b = V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE);
642 __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT)));
643
644
645
646
647
648 while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG)))
649 & M_DM_DSCR_BASE_INTERRUPT))
650 ;
651 __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE)));
652}
653EXPORT_SYMBOL(clear_page);
654
655void copy_page(void *to, void *from)
656{
657 u64 from_phys = CPHYSADDR((unsigned long)from);
658 u64 to_phys = CPHYSADDR((unsigned long)to);
659 unsigned int cpu = smp_processor_id();
660
661
662 if ((long)KSEGX((unsigned long)to) != (long)CKSEG0
663 || (long)KSEGX((unsigned long)from) != (long)CKSEG0)
664 return copy_page_cpu(to, from);
665
666 page_descr[cpu].dscr_a = to_phys | M_DM_DSCRA_L2C_DEST |
667 M_DM_DSCRA_INTERRUPT;
668 page_descr[cpu].dscr_b = from_phys | V_DM_DSCRB_SRC_LENGTH(PAGE_SIZE);
669 __raw_writeq(1, IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_COUNT)));
670
671
672
673
674
675 while (!(__raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE_DEBUG)))
676 & M_DM_DSCR_BASE_INTERRUPT))
677 ;
678 __raw_readq(IOADDR(A_DM_REGISTER(cpu, R_DM_DSCR_BASE)));
679}
680EXPORT_SYMBOL(copy_page);
681
682#endif
683
