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1da177e4 LT |
1 | /* |
2 | * Copyright (c) by Jaroslav Kysela <perex@suse.cz> | |
3 | * Copyright (c) by Takashi Iwai <tiwai@suse.de> | |
4 | * | |
5 | * EMU10K1 memory page allocation (PTB area) | |
6 | * | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <sound/driver.h> | |
25 | #include <linux/pci.h> | |
26 | #include <linux/time.h> | |
27 | #include <sound/core.h> | |
28 | #include <sound/emu10k1.h> | |
29 | ||
30 | /* page arguments of these two macros are Emu page (4096 bytes), not like | |
31 | * aligned pages in others | |
32 | */ | |
33 | #define __set_ptb_entry(emu,page,addr) \ | |
34 | (((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << 1) | (page))) | |
35 | ||
36 | #define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE) | |
37 | #define MAX_ALIGN_PAGES (MAXPAGES / UNIT_PAGES) | |
38 | /* get aligned page from offset address */ | |
39 | #define get_aligned_page(offset) ((offset) >> PAGE_SHIFT) | |
40 | /* get offset address from aligned page */ | |
41 | #define aligned_page_offset(page) ((page) << PAGE_SHIFT) | |
42 | ||
43 | #if PAGE_SIZE == 4096 | |
44 | /* page size == EMUPAGESIZE */ | |
45 | /* fill PTB entrie(s) corresponding to page with addr */ | |
46 | #define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr) | |
47 | /* fill PTB entrie(s) corresponding to page with silence pointer */ | |
48 | #define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr) | |
49 | #else | |
50 | /* fill PTB entries -- we need to fill UNIT_PAGES entries */ | |
51 | static inline void set_ptb_entry(emu10k1_t *emu, int page, dma_addr_t addr) | |
52 | { | |
53 | int i; | |
54 | page *= UNIT_PAGES; | |
55 | for (i = 0; i < UNIT_PAGES; i++, page++) { | |
56 | __set_ptb_entry(emu, page, addr); | |
57 | addr += EMUPAGESIZE; | |
58 | } | |
59 | } | |
60 | static inline void set_silent_ptb(emu10k1_t *emu, int page) | |
61 | { | |
62 | int i; | |
63 | page *= UNIT_PAGES; | |
64 | for (i = 0; i < UNIT_PAGES; i++, page++) | |
65 | /* do not increment ptr */ | |
66 | __set_ptb_entry(emu, page, emu->silent_page.addr); | |
67 | } | |
68 | #endif /* PAGE_SIZE */ | |
69 | ||
70 | ||
71 | /* | |
72 | */ | |
73 | static int synth_alloc_pages(emu10k1_t *hw, emu10k1_memblk_t *blk); | |
74 | static int synth_free_pages(emu10k1_t *hw, emu10k1_memblk_t *blk); | |
75 | ||
76 | #define get_emu10k1_memblk(l,member) list_entry(l, emu10k1_memblk_t, member) | |
77 | ||
78 | ||
79 | /* initialize emu10k1 part */ | |
80 | static void emu10k1_memblk_init(emu10k1_memblk_t *blk) | |
81 | { | |
82 | blk->mapped_page = -1; | |
83 | INIT_LIST_HEAD(&blk->mapped_link); | |
84 | INIT_LIST_HEAD(&blk->mapped_order_link); | |
85 | blk->map_locked = 0; | |
86 | ||
87 | blk->first_page = get_aligned_page(blk->mem.offset); | |
88 | blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1); | |
89 | blk->pages = blk->last_page - blk->first_page + 1; | |
90 | } | |
91 | ||
92 | /* | |
93 | * search empty region on PTB with the given size | |
94 | * | |
95 | * if an empty region is found, return the page and store the next mapped block | |
96 | * in nextp | |
97 | * if not found, return a negative error code. | |
98 | */ | |
99 | static int search_empty_map_area(emu10k1_t *emu, int npages, struct list_head **nextp) | |
100 | { | |
101 | int page = 0, found_page = -ENOMEM; | |
102 | int max_size = npages; | |
103 | int size; | |
104 | struct list_head *candidate = &emu->mapped_link_head; | |
105 | struct list_head *pos; | |
106 | ||
107 | list_for_each (pos, &emu->mapped_link_head) { | |
108 | emu10k1_memblk_t *blk = get_emu10k1_memblk(pos, mapped_link); | |
109 | snd_assert(blk->mapped_page >= 0, continue); | |
110 | size = blk->mapped_page - page; | |
111 | if (size == npages) { | |
112 | *nextp = pos; | |
113 | return page; | |
114 | } | |
115 | else if (size > max_size) { | |
116 | /* we look for the maximum empty hole */ | |
117 | max_size = size; | |
118 | candidate = pos; | |
119 | found_page = page; | |
120 | } | |
121 | page = blk->mapped_page + blk->pages; | |
122 | } | |
123 | size = MAX_ALIGN_PAGES - page; | |
124 | if (size >= max_size) { | |
125 | *nextp = pos; | |
126 | return page; | |
127 | } | |
128 | *nextp = candidate; | |
129 | return found_page; | |
130 | } | |
131 | ||
132 | /* | |
133 | * map a memory block onto emu10k1's PTB | |
134 | * | |
135 | * call with memblk_lock held | |
136 | */ | |
137 | static int map_memblk(emu10k1_t *emu, emu10k1_memblk_t *blk) | |
138 | { | |
139 | int page, pg; | |
140 | struct list_head *next; | |
141 | ||
142 | page = search_empty_map_area(emu, blk->pages, &next); | |
143 | if (page < 0) /* not found */ | |
144 | return page; | |
145 | /* insert this block in the proper position of mapped list */ | |
146 | list_add_tail(&blk->mapped_link, next); | |
147 | /* append this as a newest block in order list */ | |
148 | list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head); | |
149 | blk->mapped_page = page; | |
150 | /* fill PTB */ | |
151 | for (pg = blk->first_page; pg <= blk->last_page; pg++) { | |
152 | set_ptb_entry(emu, page, emu->page_addr_table[pg]); | |
153 | page++; | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | ||
158 | /* | |
159 | * unmap the block | |
160 | * return the size of resultant empty pages | |
161 | * | |
162 | * call with memblk_lock held | |
163 | */ | |
164 | static int unmap_memblk(emu10k1_t *emu, emu10k1_memblk_t *blk) | |
165 | { | |
166 | int start_page, end_page, mpage, pg; | |
167 | struct list_head *p; | |
168 | emu10k1_memblk_t *q; | |
169 | ||
170 | /* calculate the expected size of empty region */ | |
171 | if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) { | |
172 | q = get_emu10k1_memblk(p, mapped_link); | |
173 | start_page = q->mapped_page + q->pages; | |
174 | } else | |
175 | start_page = 0; | |
176 | if ((p = blk->mapped_link.next) != &emu->mapped_link_head) { | |
177 | q = get_emu10k1_memblk(p, mapped_link); | |
178 | end_page = q->mapped_page; | |
179 | } else | |
180 | end_page = MAX_ALIGN_PAGES; | |
181 | ||
182 | /* remove links */ | |
183 | list_del(&blk->mapped_link); | |
184 | list_del(&blk->mapped_order_link); | |
185 | /* clear PTB */ | |
186 | mpage = blk->mapped_page; | |
187 | for (pg = blk->first_page; pg <= blk->last_page; pg++) { | |
188 | set_silent_ptb(emu, mpage); | |
189 | mpage++; | |
190 | } | |
191 | blk->mapped_page = -1; | |
192 | return end_page - start_page; /* return the new empty size */ | |
193 | } | |
194 | ||
195 | /* | |
196 | * search empty pages with the given size, and create a memory block | |
197 | * | |
198 | * unlike synth_alloc the memory block is aligned to the page start | |
199 | */ | |
200 | static emu10k1_memblk_t * | |
201 | search_empty(emu10k1_t *emu, int size) | |
202 | { | |
203 | struct list_head *p; | |
204 | emu10k1_memblk_t *blk; | |
205 | int page, psize; | |
206 | ||
207 | psize = get_aligned_page(size + PAGE_SIZE -1); | |
208 | page = 0; | |
209 | list_for_each(p, &emu->memhdr->block) { | |
210 | blk = get_emu10k1_memblk(p, mem.list); | |
211 | if (page + psize <= blk->first_page) | |
212 | goto __found_pages; | |
213 | page = blk->last_page + 1; | |
214 | } | |
215 | if (page + psize > emu->max_cache_pages) | |
216 | return NULL; | |
217 | ||
218 | __found_pages: | |
219 | /* create a new memory block */ | |
220 | blk = (emu10k1_memblk_t *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev); | |
221 | if (blk == NULL) | |
222 | return NULL; | |
223 | blk->mem.offset = aligned_page_offset(page); /* set aligned offset */ | |
224 | emu10k1_memblk_init(blk); | |
225 | return blk; | |
226 | } | |
227 | ||
228 | ||
229 | /* | |
230 | * check if the given pointer is valid for pages | |
231 | */ | |
232 | static int is_valid_page(emu10k1_t *emu, dma_addr_t addr) | |
233 | { | |
234 | if (addr & ~emu->dma_mask) { | |
99b359ba | 235 | snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr); |
1da177e4 LT |
236 | return 0; |
237 | } | |
238 | if (addr & (EMUPAGESIZE-1)) { | |
99b359ba | 239 | snd_printk(KERN_ERR "page is not aligned\n"); |
1da177e4 LT |
240 | return 0; |
241 | } | |
242 | return 1; | |
243 | } | |
244 | ||
245 | /* | |
246 | * map the given memory block on PTB. | |
247 | * if the block is already mapped, update the link order. | |
248 | * if no empty pages are found, tries to release unsed memory blocks | |
249 | * and retry the mapping. | |
250 | */ | |
251 | int snd_emu10k1_memblk_map(emu10k1_t *emu, emu10k1_memblk_t *blk) | |
252 | { | |
253 | int err; | |
254 | int size; | |
255 | struct list_head *p, *nextp; | |
256 | emu10k1_memblk_t *deleted; | |
257 | unsigned long flags; | |
258 | ||
259 | spin_lock_irqsave(&emu->memblk_lock, flags); | |
260 | if (blk->mapped_page >= 0) { | |
261 | /* update order link */ | |
262 | list_del(&blk->mapped_order_link); | |
263 | list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head); | |
264 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
265 | return 0; | |
266 | } | |
267 | if ((err = map_memblk(emu, blk)) < 0) { | |
268 | /* no enough page - try to unmap some blocks */ | |
269 | /* starting from the oldest block */ | |
270 | p = emu->mapped_order_link_head.next; | |
271 | for (; p != &emu->mapped_order_link_head; p = nextp) { | |
272 | nextp = p->next; | |
273 | deleted = get_emu10k1_memblk(p, mapped_order_link); | |
274 | if (deleted->map_locked) | |
275 | continue; | |
276 | size = unmap_memblk(emu, deleted); | |
277 | if (size >= blk->pages) { | |
278 | /* ok the empty region is enough large */ | |
279 | err = map_memblk(emu, blk); | |
280 | break; | |
281 | } | |
282 | } | |
283 | } | |
284 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
285 | return err; | |
286 | } | |
287 | ||
288 | /* | |
289 | * page allocation for DMA | |
290 | */ | |
291 | snd_util_memblk_t * | |
292 | snd_emu10k1_alloc_pages(emu10k1_t *emu, snd_pcm_substream_t *substream) | |
293 | { | |
294 | snd_pcm_runtime_t *runtime = substream->runtime; | |
295 | struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream); | |
296 | snd_util_memhdr_t *hdr; | |
297 | emu10k1_memblk_t *blk; | |
298 | int page, err, idx; | |
299 | ||
300 | snd_assert(emu, return NULL); | |
301 | snd_assert(runtime->dma_bytes > 0 && runtime->dma_bytes < MAXPAGES * EMUPAGESIZE, return NULL); | |
302 | hdr = emu->memhdr; | |
303 | snd_assert(hdr, return NULL); | |
304 | ||
305 | down(&hdr->block_mutex); | |
306 | blk = search_empty(emu, runtime->dma_bytes); | |
307 | if (blk == NULL) { | |
308 | up(&hdr->block_mutex); | |
309 | return NULL; | |
310 | } | |
311 | /* fill buffer addresses but pointers are not stored so that | |
312 | * snd_free_pci_page() is not called in in synth_free() | |
313 | */ | |
314 | idx = 0; | |
315 | for (page = blk->first_page; page <= blk->last_page; page++, idx++) { | |
316 | dma_addr_t addr; | |
317 | #ifdef CONFIG_SND_DEBUG | |
318 | if (idx >= sgbuf->pages) { | |
319 | printk(KERN_ERR "emu: pages overflow! (%d-%d) for %d\n", | |
320 | blk->first_page, blk->last_page, sgbuf->pages); | |
321 | up(&hdr->block_mutex); | |
322 | return NULL; | |
323 | } | |
324 | #endif | |
325 | addr = sgbuf->table[idx].addr; | |
326 | if (! is_valid_page(emu, addr)) { | |
327 | printk(KERN_ERR "emu: failure page = %d\n", idx); | |
328 | up(&hdr->block_mutex); | |
329 | return NULL; | |
330 | } | |
331 | emu->page_addr_table[page] = addr; | |
332 | emu->page_ptr_table[page] = NULL; | |
333 | } | |
334 | ||
335 | /* set PTB entries */ | |
336 | blk->map_locked = 1; /* do not unmap this block! */ | |
337 | err = snd_emu10k1_memblk_map(emu, blk); | |
338 | if (err < 0) { | |
339 | __snd_util_mem_free(hdr, (snd_util_memblk_t *)blk); | |
340 | up(&hdr->block_mutex); | |
341 | return NULL; | |
342 | } | |
343 | up(&hdr->block_mutex); | |
344 | return (snd_util_memblk_t *)blk; | |
345 | } | |
346 | ||
347 | ||
348 | /* | |
349 | * release DMA buffer from page table | |
350 | */ | |
351 | int snd_emu10k1_free_pages(emu10k1_t *emu, snd_util_memblk_t *blk) | |
352 | { | |
353 | snd_assert(emu && blk, return -EINVAL); | |
354 | return snd_emu10k1_synth_free(emu, blk); | |
355 | } | |
356 | ||
357 | ||
358 | /* | |
359 | * memory allocation using multiple pages (for synth) | |
360 | * Unlike the DMA allocation above, non-contiguous pages are assined. | |
361 | */ | |
362 | ||
363 | /* | |
364 | * allocate a synth sample area | |
365 | */ | |
366 | snd_util_memblk_t * | |
367 | snd_emu10k1_synth_alloc(emu10k1_t *hw, unsigned int size) | |
368 | { | |
369 | emu10k1_memblk_t *blk; | |
370 | snd_util_memhdr_t *hdr = hw->memhdr; | |
371 | ||
372 | down(&hdr->block_mutex); | |
373 | blk = (emu10k1_memblk_t *)__snd_util_mem_alloc(hdr, size); | |
374 | if (blk == NULL) { | |
375 | up(&hdr->block_mutex); | |
376 | return NULL; | |
377 | } | |
378 | if (synth_alloc_pages(hw, blk)) { | |
379 | __snd_util_mem_free(hdr, (snd_util_memblk_t *)blk); | |
380 | up(&hdr->block_mutex); | |
381 | return NULL; | |
382 | } | |
383 | snd_emu10k1_memblk_map(hw, blk); | |
384 | up(&hdr->block_mutex); | |
385 | return (snd_util_memblk_t *)blk; | |
386 | } | |
387 | ||
388 | ||
389 | /* | |
390 | * free a synth sample area | |
391 | */ | |
392 | int | |
393 | snd_emu10k1_synth_free(emu10k1_t *emu, snd_util_memblk_t *memblk) | |
394 | { | |
395 | snd_util_memhdr_t *hdr = emu->memhdr; | |
396 | emu10k1_memblk_t *blk = (emu10k1_memblk_t *)memblk; | |
397 | unsigned long flags; | |
398 | ||
399 | down(&hdr->block_mutex); | |
400 | spin_lock_irqsave(&emu->memblk_lock, flags); | |
401 | if (blk->mapped_page >= 0) | |
402 | unmap_memblk(emu, blk); | |
403 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
404 | synth_free_pages(emu, blk); | |
405 | __snd_util_mem_free(hdr, memblk); | |
406 | up(&hdr->block_mutex); | |
407 | return 0; | |
408 | } | |
409 | ||
410 | ||
411 | /* check new allocation range */ | |
412 | static void get_single_page_range(snd_util_memhdr_t *hdr, emu10k1_memblk_t *blk, int *first_page_ret, int *last_page_ret) | |
413 | { | |
414 | struct list_head *p; | |
415 | emu10k1_memblk_t *q; | |
416 | int first_page, last_page; | |
417 | first_page = blk->first_page; | |
418 | if ((p = blk->mem.list.prev) != &hdr->block) { | |
419 | q = get_emu10k1_memblk(p, mem.list); | |
420 | if (q->last_page == first_page) | |
421 | first_page++; /* first page was already allocated */ | |
422 | } | |
423 | last_page = blk->last_page; | |
424 | if ((p = blk->mem.list.next) != &hdr->block) { | |
425 | q = get_emu10k1_memblk(p, mem.list); | |
426 | if (q->first_page == last_page) | |
427 | last_page--; /* last page was already allocated */ | |
428 | } | |
429 | *first_page_ret = first_page; | |
430 | *last_page_ret = last_page; | |
431 | } | |
432 | ||
433 | /* | |
434 | * allocate kernel pages | |
435 | */ | |
436 | static int synth_alloc_pages(emu10k1_t *emu, emu10k1_memblk_t *blk) | |
437 | { | |
438 | int page, first_page, last_page; | |
439 | struct snd_dma_buffer dmab; | |
440 | ||
441 | emu10k1_memblk_init(blk); | |
442 | get_single_page_range(emu->memhdr, blk, &first_page, &last_page); | |
443 | /* allocate kernel pages */ | |
444 | for (page = first_page; page <= last_page; page++) { | |
445 | if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(emu->pci), | |
446 | PAGE_SIZE, &dmab) < 0) | |
447 | goto __fail; | |
448 | if (! is_valid_page(emu, dmab.addr)) { | |
449 | snd_dma_free_pages(&dmab); | |
450 | goto __fail; | |
451 | } | |
452 | emu->page_addr_table[page] = dmab.addr; | |
453 | emu->page_ptr_table[page] = dmab.area; | |
454 | } | |
455 | return 0; | |
456 | ||
457 | __fail: | |
458 | /* release allocated pages */ | |
459 | last_page = page - 1; | |
460 | for (page = first_page; page <= last_page; page++) { | |
461 | dmab.area = emu->page_ptr_table[page]; | |
462 | dmab.addr = emu->page_addr_table[page]; | |
463 | dmab.bytes = PAGE_SIZE; | |
464 | snd_dma_free_pages(&dmab); | |
465 | emu->page_addr_table[page] = 0; | |
466 | emu->page_ptr_table[page] = NULL; | |
467 | } | |
468 | ||
469 | return -ENOMEM; | |
470 | } | |
471 | ||
472 | /* | |
473 | * free pages | |
474 | */ | |
475 | static int synth_free_pages(emu10k1_t *emu, emu10k1_memblk_t *blk) | |
476 | { | |
477 | int page, first_page, last_page; | |
478 | struct snd_dma_buffer dmab; | |
479 | ||
480 | get_single_page_range(emu->memhdr, blk, &first_page, &last_page); | |
481 | dmab.dev.type = SNDRV_DMA_TYPE_DEV; | |
482 | dmab.dev.dev = snd_dma_pci_data(emu->pci); | |
483 | for (page = first_page; page <= last_page; page++) { | |
484 | if (emu->page_ptr_table[page] == NULL) | |
485 | continue; | |
486 | dmab.area = emu->page_ptr_table[page]; | |
487 | dmab.addr = emu->page_addr_table[page]; | |
488 | dmab.bytes = PAGE_SIZE; | |
489 | snd_dma_free_pages(&dmab); | |
490 | emu->page_addr_table[page] = 0; | |
491 | emu->page_ptr_table[page] = NULL; | |
492 | } | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
497 | /* calculate buffer pointer from offset address */ | |
77933d72 | 498 | static inline void *offset_ptr(emu10k1_t *emu, int page, int offset) |
1da177e4 LT |
499 | { |
500 | char *ptr; | |
501 | snd_assert(page >= 0 && page < emu->max_cache_pages, return NULL); | |
502 | ptr = emu->page_ptr_table[page]; | |
503 | if (! ptr) { | |
99b359ba | 504 | printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page); |
1da177e4 LT |
505 | return NULL; |
506 | } | |
507 | ptr += offset & (PAGE_SIZE - 1); | |
508 | return (void*)ptr; | |
509 | } | |
510 | ||
511 | /* | |
512 | * bzero(blk + offset, size) | |
513 | */ | |
514 | int snd_emu10k1_synth_bzero(emu10k1_t *emu, snd_util_memblk_t *blk, int offset, int size) | |
515 | { | |
516 | int page, nextofs, end_offset, temp, temp1; | |
517 | void *ptr; | |
518 | emu10k1_memblk_t *p = (emu10k1_memblk_t *)blk; | |
519 | ||
520 | offset += blk->offset & (PAGE_SIZE - 1); | |
521 | end_offset = offset + size; | |
522 | page = get_aligned_page(offset); | |
523 | do { | |
524 | nextofs = aligned_page_offset(page + 1); | |
525 | temp = nextofs - offset; | |
526 | temp1 = end_offset - offset; | |
527 | if (temp1 < temp) | |
528 | temp = temp1; | |
529 | ptr = offset_ptr(emu, page + p->first_page, offset); | |
530 | if (ptr) | |
531 | memset(ptr, 0, temp); | |
532 | offset = nextofs; | |
533 | page++; | |
534 | } while (offset < end_offset); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | /* | |
539 | * copy_from_user(blk + offset, data, size) | |
540 | */ | |
541 | int snd_emu10k1_synth_copy_from_user(emu10k1_t *emu, snd_util_memblk_t *blk, int offset, const char __user *data, int size) | |
542 | { | |
543 | int page, nextofs, end_offset, temp, temp1; | |
544 | void *ptr; | |
545 | emu10k1_memblk_t *p = (emu10k1_memblk_t *)blk; | |
546 | ||
547 | offset += blk->offset & (PAGE_SIZE - 1); | |
548 | end_offset = offset + size; | |
549 | page = get_aligned_page(offset); | |
550 | do { | |
551 | nextofs = aligned_page_offset(page + 1); | |
552 | temp = nextofs - offset; | |
553 | temp1 = end_offset - offset; | |
554 | if (temp1 < temp) | |
555 | temp = temp1; | |
556 | ptr = offset_ptr(emu, page + p->first_page, offset); | |
557 | if (ptr && copy_from_user(ptr, data, temp)) | |
558 | return -EFAULT; | |
559 | offset = nextofs; | |
560 | data += temp; | |
561 | page++; | |
562 | } while (offset < end_offset); | |
563 | return 0; | |
564 | } |