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Linux/arch/parisc/kernel/pci-dma.c

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  1 /*
  2 ** PARISC 1.1 Dynamic DMA mapping support.
  3 ** This implementation is for PA-RISC platforms that do not support
  4 ** I/O TLBs (aka DMA address translation hardware).
  5 ** See Documentation/DMA-API-HOWTO.txt for interface definitions.
  6 **
  7 **      (c) Copyright 1999,2000 Hewlett-Packard Company
  8 **      (c) Copyright 2000 Grant Grundler
  9 **      (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
 10 **      (c) Copyright 2000 John Marvin
 11 **
 12 ** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
 13 ** (I assume it's from David Mosberger-Tang but there was no Copyright)
 14 **
 15 ** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
 16 **
 17 ** - ggg
 18 */
 19 
 20 #include <linux/init.h>
 21 #include <linux/gfp.h>
 22 #include <linux/mm.h>
 23 #include <linux/pci.h>
 24 #include <linux/proc_fs.h>
 25 #include <linux/seq_file.h>
 26 #include <linux/string.h>
 27 #include <linux/types.h>
 28 #include <linux/scatterlist.h>
 29 #include <linux/export.h>
 30 
 31 #include <asm/cacheflush.h>
 32 #include <asm/dma.h>    /* for DMA_CHUNK_SIZE */
 33 #include <asm/io.h>
 34 #include <asm/page.h>   /* get_order */
 35 #include <asm/pgalloc.h>
 36 #include <linux/uaccess.h>
 37 #include <asm/tlbflush.h>       /* for purge_tlb_*() macros */
 38 
 39 static struct proc_dir_entry * proc_gsc_root __read_mostly = NULL;
 40 static unsigned long pcxl_used_bytes __read_mostly = 0;
 41 static unsigned long pcxl_used_pages __read_mostly = 0;
 42 
 43 extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
 44 static spinlock_t   pcxl_res_lock;
 45 static char    *pcxl_res_map;
 46 static int     pcxl_res_hint;
 47 static int     pcxl_res_size;
 48 
 49 #ifdef DEBUG_PCXL_RESOURCE
 50 #define DBG_RES(x...)   printk(x)
 51 #else
 52 #define DBG_RES(x...)
 53 #endif
 54 
 55 
 56 /*
 57 ** Dump a hex representation of the resource map.
 58 */
 59 
 60 #ifdef DUMP_RESMAP
 61 static
 62 void dump_resmap(void)
 63 {
 64         u_long *res_ptr = (unsigned long *)pcxl_res_map;
 65         u_long i = 0;
 66 
 67         printk("res_map: ");
 68         for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
 69                 printk("%08lx ", *res_ptr);
 70 
 71         printk("\n");
 72 }
 73 #else
 74 static inline void dump_resmap(void) {;}
 75 #endif
 76 
 77 static int pa11_dma_supported( struct device *dev, u64 mask)
 78 {
 79         return 1;
 80 }
 81 
 82 static inline int map_pte_uncached(pte_t * pte,
 83                 unsigned long vaddr,
 84                 unsigned long size, unsigned long *paddr_ptr)
 85 {
 86         unsigned long end;
 87         unsigned long orig_vaddr = vaddr;
 88 
 89         vaddr &= ~PMD_MASK;
 90         end = vaddr + size;
 91         if (end > PMD_SIZE)
 92                 end = PMD_SIZE;
 93         do {
 94                 unsigned long flags;
 95 
 96                 if (!pte_none(*pte))
 97                         printk(KERN_ERR "map_pte_uncached: page already exists\n");
 98                 purge_tlb_start(flags);
 99                 set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
100                 pdtlb_kernel(orig_vaddr);
101                 purge_tlb_end(flags);
102                 vaddr += PAGE_SIZE;
103                 orig_vaddr += PAGE_SIZE;
104                 (*paddr_ptr) += PAGE_SIZE;
105                 pte++;
106         } while (vaddr < end);
107         return 0;
108 }
109 
110 static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
111                 unsigned long size, unsigned long *paddr_ptr)
112 {
113         unsigned long end;
114         unsigned long orig_vaddr = vaddr;
115 
116         vaddr &= ~PGDIR_MASK;
117         end = vaddr + size;
118         if (end > PGDIR_SIZE)
119                 end = PGDIR_SIZE;
120         do {
121                 pte_t * pte = pte_alloc_kernel(pmd, vaddr);
122                 if (!pte)
123                         return -ENOMEM;
124                 if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
125                         return -ENOMEM;
126                 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
127                 orig_vaddr += PMD_SIZE;
128                 pmd++;
129         } while (vaddr < end);
130         return 0;
131 }
132 
133 static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
134                 unsigned long paddr)
135 {
136         pgd_t * dir;
137         unsigned long end = vaddr + size;
138 
139         dir = pgd_offset_k(vaddr);
140         do {
141                 pmd_t *pmd;
142                 
143                 pmd = pmd_alloc(NULL, dir, vaddr);
144                 if (!pmd)
145                         return -ENOMEM;
146                 if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
147                         return -ENOMEM;
148                 vaddr = vaddr + PGDIR_SIZE;
149                 dir++;
150         } while (vaddr && (vaddr < end));
151         return 0;
152 }
153 
154 static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
155                 unsigned long size)
156 {
157         pte_t * pte;
158         unsigned long end;
159         unsigned long orig_vaddr = vaddr;
160 
161         if (pmd_none(*pmd))
162                 return;
163         if (pmd_bad(*pmd)) {
164                 pmd_ERROR(*pmd);
165                 pmd_clear(pmd);
166                 return;
167         }
168         pte = pte_offset_map(pmd, vaddr);
169         vaddr &= ~PMD_MASK;
170         end = vaddr + size;
171         if (end > PMD_SIZE)
172                 end = PMD_SIZE;
173         do {
174                 unsigned long flags;
175                 pte_t page = *pte;
176 
177                 pte_clear(&init_mm, vaddr, pte);
178                 purge_tlb_start(flags);
179                 pdtlb_kernel(orig_vaddr);
180                 purge_tlb_end(flags);
181                 vaddr += PAGE_SIZE;
182                 orig_vaddr += PAGE_SIZE;
183                 pte++;
184                 if (pte_none(page) || pte_present(page))
185                         continue;
186                 printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
187         } while (vaddr < end);
188 }
189 
190 static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
191                 unsigned long size)
192 {
193         pmd_t * pmd;
194         unsigned long end;
195         unsigned long orig_vaddr = vaddr;
196 
197         if (pgd_none(*dir))
198                 return;
199         if (pgd_bad(*dir)) {
200                 pgd_ERROR(*dir);
201                 pgd_clear(dir);
202                 return;
203         }
204         pmd = pmd_offset(dir, vaddr);
205         vaddr &= ~PGDIR_MASK;
206         end = vaddr + size;
207         if (end > PGDIR_SIZE)
208                 end = PGDIR_SIZE;
209         do {
210                 unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
211                 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
212                 orig_vaddr += PMD_SIZE;
213                 pmd++;
214         } while (vaddr < end);
215 }
216 
217 static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
218 {
219         pgd_t * dir;
220         unsigned long end = vaddr + size;
221 
222         dir = pgd_offset_k(vaddr);
223         do {
224                 unmap_uncached_pmd(dir, vaddr, end - vaddr);
225                 vaddr = vaddr + PGDIR_SIZE;
226                 dir++;
227         } while (vaddr && (vaddr < end));
228 }
229 
230 #define PCXL_SEARCH_LOOP(idx, mask, size)  \
231        for(; res_ptr < res_end; ++res_ptr) \
232        { \
233                if(0 == ((*res_ptr) & mask)) { \
234                        *res_ptr |= mask; \
235                        idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
236                        pcxl_res_hint = idx + (size >> 3); \
237                        goto resource_found; \
238                } \
239        }
240 
241 #define PCXL_FIND_FREE_MAPPING(idx, mask, size)  { \
242        u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
243        u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
244        PCXL_SEARCH_LOOP(idx, mask, size); \
245        res_ptr = (u##size *)&pcxl_res_map[0]; \
246        PCXL_SEARCH_LOOP(idx, mask, size); \
247 }
248 
249 unsigned long
250 pcxl_alloc_range(size_t size)
251 {
252         int res_idx;
253         u_long mask, flags;
254         unsigned int pages_needed = size >> PAGE_SHIFT;
255 
256         mask = (u_long) -1L;
257         mask >>= BITS_PER_LONG - pages_needed;
258 
259         DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n", 
260                 size, pages_needed, mask);
261 
262         spin_lock_irqsave(&pcxl_res_lock, flags);
263 
264         if(pages_needed <= 8) {
265                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
266         } else if(pages_needed <= 16) {
267                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
268         } else if(pages_needed <= 32) {
269                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
270         } else {
271                 panic("%s: pcxl_alloc_range() Too many pages to map.\n",
272                       __FILE__);
273         }
274 
275         dump_resmap();
276         panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
277               __FILE__);
278         
279 resource_found:
280         
281         DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
282                 res_idx, mask, pcxl_res_hint);
283 
284         pcxl_used_pages += pages_needed;
285         pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
286 
287         spin_unlock_irqrestore(&pcxl_res_lock, flags);
288 
289         dump_resmap();
290 
291         /* 
292         ** return the corresponding vaddr in the pcxl dma map
293         */
294         return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
295 }
296 
297 #define PCXL_FREE_MAPPINGS(idx, m, size) \
298                 u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
299                 /* BUG_ON((*res_ptr & m) != m); */ \
300                 *res_ptr &= ~m;
301 
302 /*
303 ** clear bits in the pcxl resource map
304 */
305 static void
306 pcxl_free_range(unsigned long vaddr, size_t size)
307 {
308         u_long mask, flags;
309         unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
310         unsigned int pages_mapped = size >> PAGE_SHIFT;
311 
312         mask = (u_long) -1L;
313         mask >>= BITS_PER_LONG - pages_mapped;
314 
315         DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n", 
316                 res_idx, size, pages_mapped, mask);
317 
318         spin_lock_irqsave(&pcxl_res_lock, flags);
319 
320         if(pages_mapped <= 8) {
321                 PCXL_FREE_MAPPINGS(res_idx, mask, 8);
322         } else if(pages_mapped <= 16) {
323                 PCXL_FREE_MAPPINGS(res_idx, mask, 16);
324         } else if(pages_mapped <= 32) {
325                 PCXL_FREE_MAPPINGS(res_idx, mask, 32);
326         } else {
327                 panic("%s: pcxl_free_range() Too many pages to unmap.\n",
328                       __FILE__);
329         }
330         
331         pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
332         pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
333 
334         spin_unlock_irqrestore(&pcxl_res_lock, flags);
335 
336         dump_resmap();
337 }
338 
339 static int proc_pcxl_dma_show(struct seq_file *m, void *v)
340 {
341 #if 0
342         u_long i = 0;
343         unsigned long *res_ptr = (u_long *)pcxl_res_map;
344 #endif
345         unsigned long total_pages = pcxl_res_size << 3;   /* 8 bits per byte */
346 
347         seq_printf(m, "\nDMA Mapping Area size    : %d bytes (%ld pages)\n",
348                 PCXL_DMA_MAP_SIZE, total_pages);
349 
350         seq_printf(m, "Resource bitmap : %d bytes\n", pcxl_res_size);
351 
352         seq_puts(m,  "            total:    free:    used:   % used:\n");
353         seq_printf(m, "blocks  %8d %8ld %8ld %8ld%%\n", pcxl_res_size,
354                 pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
355                 (pcxl_used_bytes * 100) / pcxl_res_size);
356 
357         seq_printf(m, "pages   %8ld %8ld %8ld %8ld%%\n", total_pages,
358                 total_pages - pcxl_used_pages, pcxl_used_pages,
359                 (pcxl_used_pages * 100 / total_pages));
360 
361 #if 0
362         seq_puts(m, "\nResource bitmap:");
363 
364         for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
365                 if ((i & 7) == 0)
366                     seq_puts(m,"\n   ");
367                 seq_printf(m, "%s %08lx", buf, *res_ptr);
368         }
369 #endif
370         seq_putc(m, '\n');
371         return 0;
372 }
373 
374 static int proc_pcxl_dma_open(struct inode *inode, struct file *file)
375 {
376         return single_open(file, proc_pcxl_dma_show, NULL);
377 }
378 
379 static const struct file_operations proc_pcxl_dma_ops = {
380         .owner          = THIS_MODULE,
381         .open           = proc_pcxl_dma_open,
382         .read           = seq_read,
383         .llseek         = seq_lseek,
384         .release        = single_release,
385 };
386 
387 static int __init
388 pcxl_dma_init(void)
389 {
390         if (pcxl_dma_start == 0)
391                 return 0;
392 
393         spin_lock_init(&pcxl_res_lock);
394         pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
395         pcxl_res_hint = 0;
396         pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
397                                             get_order(pcxl_res_size));
398         memset(pcxl_res_map, 0, pcxl_res_size);
399         proc_gsc_root = proc_mkdir("gsc", NULL);
400         if (!proc_gsc_root)
401                 printk(KERN_WARNING
402                         "pcxl_dma_init: Unable to create gsc /proc dir entry\n");
403         else {
404                 struct proc_dir_entry* ent;
405                 ent = proc_create("pcxl_dma", 0, proc_gsc_root,
406                                   &proc_pcxl_dma_ops);
407                 if (!ent)
408                         printk(KERN_WARNING
409                                 "pci-dma.c: Unable to create pcxl_dma /proc entry.\n");
410         }
411         return 0;
412 }
413 
414 __initcall(pcxl_dma_init);
415 
416 static void *pa11_dma_alloc(struct device *dev, size_t size,
417                 dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
418 {
419         unsigned long vaddr;
420         unsigned long paddr;
421         int order;
422 
423         order = get_order(size);
424         size = 1 << (order + PAGE_SHIFT);
425         vaddr = pcxl_alloc_range(size);
426         paddr = __get_free_pages(flag, order);
427         flush_kernel_dcache_range(paddr, size);
428         paddr = __pa(paddr);
429         map_uncached_pages(vaddr, size, paddr);
430         *dma_handle = (dma_addr_t) paddr;
431 
432 #if 0
433 /* This probably isn't needed to support EISA cards.
434 ** ISA cards will certainly only support 24-bit DMA addressing.
435 ** Not clear if we can, want, or need to support ISA.
436 */
437         if (!dev || *dev->coherent_dma_mask < 0xffffffff)
438                 gfp |= GFP_DMA;
439 #endif
440         return (void *)vaddr;
441 }
442 
443 static void pa11_dma_free(struct device *dev, size_t size, void *vaddr,
444                 dma_addr_t dma_handle, unsigned long attrs)
445 {
446         int order;
447 
448         order = get_order(size);
449         size = 1 << (order + PAGE_SHIFT);
450         unmap_uncached_pages((unsigned long)vaddr, size);
451         pcxl_free_range((unsigned long)vaddr, size);
452         free_pages((unsigned long)__va(dma_handle), order);
453 }
454 
455 static dma_addr_t pa11_dma_map_page(struct device *dev, struct page *page,
456                 unsigned long offset, size_t size,
457                 enum dma_data_direction direction, unsigned long attrs)
458 {
459         void *addr = page_address(page) + offset;
460         BUG_ON(direction == DMA_NONE);
461 
462         if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
463                 flush_kernel_dcache_range((unsigned long) addr, size);
464 
465         return virt_to_phys(addr);
466 }
467 
468 static void pa11_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
469                 size_t size, enum dma_data_direction direction,
470                 unsigned long attrs)
471 {
472         BUG_ON(direction == DMA_NONE);
473 
474         if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
475                 return;
476 
477         if (direction == DMA_TO_DEVICE)
478                 return;
479 
480         /*
481          * For PCI_DMA_FROMDEVICE this flush is not necessary for the
482          * simple map/unmap case. However, it IS necessary if if
483          * pci_dma_sync_single_* has been called and the buffer reused.
484          */
485 
486         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
487 }
488 
489 static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist,
490                 int nents, enum dma_data_direction direction,
491                 unsigned long attrs)
492 {
493         int i;
494         struct scatterlist *sg;
495 
496         BUG_ON(direction == DMA_NONE);
497 
498         for_each_sg(sglist, sg, nents, i) {
499                 unsigned long vaddr = (unsigned long)sg_virt(sg);
500 
501                 sg_dma_address(sg) = (dma_addr_t) virt_to_phys(vaddr);
502                 sg_dma_len(sg) = sg->length;
503 
504                 if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
505                         continue;
506 
507                 flush_kernel_dcache_range(vaddr, sg->length);
508         }
509         return nents;
510 }
511 
512 static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
513                 int nents, enum dma_data_direction direction,
514                 unsigned long attrs)
515 {
516         int i;
517         struct scatterlist *sg;
518 
519         BUG_ON(direction == DMA_NONE);
520 
521         if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
522                 return;
523 
524         if (direction == DMA_TO_DEVICE)
525                 return;
526 
527         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
528 
529         for_each_sg(sglist, sg, nents, i)
530                 flush_kernel_vmap_range(sg_virt(sg), sg->length);
531 }
532 
533 static void pa11_dma_sync_single_for_cpu(struct device *dev,
534                 dma_addr_t dma_handle, size_t size,
535                 enum dma_data_direction direction)
536 {
537         BUG_ON(direction == DMA_NONE);
538 
539         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle),
540                         size);
541 }
542 
543 static void pa11_dma_sync_single_for_device(struct device *dev,
544                 dma_addr_t dma_handle, size_t size,
545                 enum dma_data_direction direction)
546 {
547         BUG_ON(direction == DMA_NONE);
548 
549         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle),
550                         size);
551 }
552 
553 static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
554 {
555         int i;
556         struct scatterlist *sg;
557 
558         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
559 
560         for_each_sg(sglist, sg, nents, i)
561                 flush_kernel_vmap_range(sg_virt(sg), sg->length);
562 }
563 
564 static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
565 {
566         int i;
567         struct scatterlist *sg;
568 
569         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
570 
571         for_each_sg(sglist, sg, nents, i)
572                 flush_kernel_vmap_range(sg_virt(sg), sg->length);
573 }
574 
575 const struct dma_map_ops pcxl_dma_ops = {
576         .dma_supported =        pa11_dma_supported,
577         .alloc =                pa11_dma_alloc,
578         .free =                 pa11_dma_free,
579         .map_page =             pa11_dma_map_page,
580         .unmap_page =           pa11_dma_unmap_page,
581         .map_sg =               pa11_dma_map_sg,
582         .unmap_sg =             pa11_dma_unmap_sg,
583         .sync_single_for_cpu =  pa11_dma_sync_single_for_cpu,
584         .sync_single_for_device = pa11_dma_sync_single_for_device,
585         .sync_sg_for_cpu =      pa11_dma_sync_sg_for_cpu,
586         .sync_sg_for_device =   pa11_dma_sync_sg_for_device,
587 };
588 
589 static void *pcx_dma_alloc(struct device *dev, size_t size,
590                 dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)
591 {
592         void *addr;
593 
594         if ((attrs & DMA_ATTR_NON_CONSISTENT) == 0)
595                 return NULL;
596 
597         addr = (void *)__get_free_pages(flag, get_order(size));
598         if (addr)
599                 *dma_handle = (dma_addr_t)virt_to_phys(addr);
600 
601         return addr;
602 }
603 
604 static void pcx_dma_free(struct device *dev, size_t size, void *vaddr,
605                 dma_addr_t iova, unsigned long attrs)
606 {
607         free_pages((unsigned long)vaddr, get_order(size));
608         return;
609 }
610 
611 const struct dma_map_ops pcx_dma_ops = {
612         .dma_supported =        pa11_dma_supported,
613         .alloc =                pcx_dma_alloc,
614         .free =                 pcx_dma_free,
615         .map_page =             pa11_dma_map_page,
616         .unmap_page =           pa11_dma_unmap_page,
617         .map_sg =               pa11_dma_map_sg,
618         .unmap_sg =             pa11_dma_unmap_sg,
619         .sync_single_for_cpu =  pa11_dma_sync_single_for_cpu,
620         .sync_single_for_device = pa11_dma_sync_single_for_device,
621         .sync_sg_for_cpu =      pa11_dma_sync_sg_for_cpu,
622         .sync_sg_for_device =   pa11_dma_sync_sg_for_device,
623 };
624 

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