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ioport.c
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1 /*
2  * ioport.c: Simple io mapping allocator.
3  *
4  * Copyright (C) 1995 David S. Miller ([email protected])
5  * Copyright (C) 1995 Miguel de Icaza ([email protected])
6  *
7  * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
8  *
9  * 2000/01/29
10  * <rth> zait: as long as pci_alloc_consistent produces something addressable,
11  * things are ok.
12  * <zaitcev> rth: no, it is relevant, because get_free_pages returns you a
13  * pointer into the big page mapping
14  * <rth> zait: so what?
15  * <rth> zait: remap_it_my_way(virt_to_phys(get_free_page()))
16  * <zaitcev> Hmm
17  * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
18  * So far so good.
19  * <zaitcev> Now, driver calls pci_free_consistent(with result of
20  * remap_it_my_way()).
21  * <zaitcev> How do you find the address to pass to free_pages()?
22  * <rth> zait: walk the page tables? It's only two or three level after all.
23  * <rth> zait: you have to walk them anyway to remove the mapping.
24  * <zaitcev> Hmm
25  * <zaitcev> Sounds reasonable
26  */
27 
28 #include <linux/module.h>
29 #include <linux/sched.h>
30 #include <linux/kernel.h>
31 #include <linux/errno.h>
32 #include <linux/types.h>
33 #include <linux/ioport.h>
34 #include <linux/mm.h>
35 #include <linux/slab.h>
36 #include <linux/pci.h> /* struct pci_dev */
37 #include <linux/proc_fs.h>
38 #include <linux/seq_file.h>
39 #include <linux/scatterlist.h>
40 #include <linux/of_device.h>
41 
42 #include <asm/io.h>
43 #include <asm/vaddrs.h>
44 #include <asm/oplib.h>
45 #include <asm/prom.h>
46 #include <asm/page.h>
47 #include <asm/pgalloc.h>
48 #include <asm/dma.h>
49 #include <asm/iommu.h>
50 #include <asm/io-unit.h>
51 #include <asm/leon.h>
52 
54 
55 /* This function must make sure that caches and memory are coherent after DMA
56  * On LEON systems without cache snooping it flushes the entire D-CACHE.
57  */
58 static inline void dma_make_coherent(unsigned long pa, unsigned long len)
59 {
60  if (sparc_cpu_model == sparc_leon) {
61  if (!sparc_leon3_snooping_enabled())
63  }
64 }
65 
66 static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
67 static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
68  unsigned long size, char *name);
69 static void _sparc_free_io(struct resource *res);
70 
71 static void register_proc_sparc_ioport(void);
72 
73 /* This points to the next to use virtual memory for DVMA mappings */
74 static struct resource _sparc_dvma = {
75  .name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
76 };
77 /* This points to the start of I/O mappings, cluable from outside. */
78 /*ext*/ struct resource sparc_iomap = {
79  .name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
80 };
81 
82 /*
83  * Our mini-allocator...
84  * Boy this is gross! We need it because we must map I/O for
85  * timers and interrupt controller before the kmalloc is available.
86  */
87 
88 #define XNMLN 15
89 #define XNRES 10 /* SS-10 uses 8 */
90 
91 struct xresource {
92  struct resource xres; /* Must be first */
93  int xflag; /* 1 == used */
94  char xname[XNMLN+1];
95 };
96 
97 static struct xresource xresv[XNRES];
98 
99 static struct xresource *xres_alloc(void) {
100  struct xresource *xrp;
101  int n;
102 
103  xrp = xresv;
104  for (n = 0; n < XNRES; n++) {
105  if (xrp->xflag == 0) {
106  xrp->xflag = 1;
107  return xrp;
108  }
109  xrp++;
110  }
111  return NULL;
112 }
113 
114 static void xres_free(struct xresource *xrp) {
115  xrp->xflag = 0;
116 }
117 
118 /*
119  * These are typically used in PCI drivers
120  * which are trying to be cross-platform.
121  *
122  * Bus type is always zero on IIep.
123  */
124 void __iomem *ioremap(unsigned long offset, unsigned long size)
125 {
126  char name[14];
127 
128  sprintf(name, "phys_%08x", (u32)offset);
129  return _sparc_alloc_io(0, offset, size, name);
130 }
132 
133 /*
134  * Comlimentary to ioremap().
135  */
136 void iounmap(volatile void __iomem *virtual)
137 {
138  unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
139  struct resource *res;
140 
141  /*
142  * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
143  * This probably warrants some sort of hashing.
144  */
145  if ((res = lookup_resource(&sparc_iomap, vaddr)) == NULL) {
146  printk("free_io/iounmap: cannot free %lx\n", vaddr);
147  return;
148  }
149  _sparc_free_io(res);
150 
151  if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
152  xres_free((struct xresource *)res);
153  } else {
154  kfree(res);
155  }
156 }
158 
159 void __iomem *of_ioremap(struct resource *res, unsigned long offset,
160  unsigned long size, char *name)
161 {
162  return _sparc_alloc_io(res->flags & 0xF,
163  res->start + offset,
164  size, name);
165 }
167 
168 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
169 {
170  iounmap(base);
171 }
173 
174 /*
175  * Meat of mapping
176  */
177 static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
178  unsigned long size, char *name)
179 {
180  static int printed_full;
181  struct xresource *xres;
182  struct resource *res;
183  char *tack;
184  int tlen;
185  void __iomem *va; /* P3 diag */
186 
187  if (name == NULL) name = "???";
188 
189  if ((xres = xres_alloc()) != 0) {
190  tack = xres->xname;
191  res = &xres->xres;
192  } else {
193  if (!printed_full) {
194  printk("ioremap: done with statics, switching to malloc\n");
195  printed_full = 1;
196  }
197  tlen = strlen(name);
198  tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
199  if (tack == NULL) return NULL;
200  memset(tack, 0, sizeof(struct resource));
201  res = (struct resource *) tack;
202  tack += sizeof (struct resource);
203  }
204 
205  strlcpy(tack, name, XNMLN+1);
206  res->name = tack;
207 
208  va = _sparc_ioremap(res, busno, phys, size);
209  /* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
210  return va;
211 }
212 
213 /*
214  */
215 static void __iomem *
216 _sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
217 {
218  unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
219 
220  if (allocate_resource(&sparc_iomap, res,
221  (offset + sz + PAGE_SIZE-1) & PAGE_MASK,
222  sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
223  /* Usually we cannot see printks in this case. */
224  prom_printf("alloc_io_res(%s): cannot occupy\n",
225  (res->name != NULL)? res->name: "???");
226  prom_halt();
227  }
228 
229  pa &= PAGE_MASK;
230  srmmu_mapiorange(bus, pa, res->start, resource_size(res));
231 
232  return (void __iomem *)(unsigned long)(res->start + offset);
233 }
234 
235 /*
236  * Comlimentary to _sparc_ioremap().
237  */
238 static void _sparc_free_io(struct resource *res)
239 {
240  unsigned long plen;
241 
242  plen = resource_size(res);
243  BUG_ON((plen & (PAGE_SIZE-1)) != 0);
244  srmmu_unmapiorange(res->start, plen);
245  release_resource(res);
246 }
247 
248 #ifdef CONFIG_SBUS
249 
250 void sbus_set_sbus64(struct device *dev, int x)
251 {
252  printk("sbus_set_sbus64: unsupported\n");
253 }
255 
256 /*
257  * Allocate a chunk of memory suitable for DMA.
258  * Typically devices use them for control blocks.
259  * CPU may access them without any explicit flushing.
260  */
261 static void *sbus_alloc_coherent(struct device *dev, size_t len,
262  dma_addr_t *dma_addrp, gfp_t gfp,
263  struct dma_attrs *attrs)
264 {
265  struct platform_device *op = to_platform_device(dev);
266  unsigned long len_total = PAGE_ALIGN(len);
267  unsigned long va;
268  struct resource *res;
269  int order;
270 
271  /* XXX why are some lengths signed, others unsigned? */
272  if (len <= 0) {
273  return NULL;
274  }
275  /* XXX So what is maxphys for us and how do drivers know it? */
276  if (len > 256*1024) { /* __get_free_pages() limit */
277  return NULL;
278  }
279 
280  order = get_order(len_total);
281  if ((va = __get_free_pages(GFP_KERNEL|__GFP_COMP, order)) == 0)
282  goto err_nopages;
283 
284  if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL)
285  goto err_nomem;
286 
287  if (allocate_resource(&_sparc_dvma, res, len_total,
288  _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
289  printk("sbus_alloc_consistent: cannot occupy 0x%lx", len_total);
290  goto err_nova;
291  }
292 
293  // XXX The sbus_map_dma_area does this for us below, see comments.
294  // srmmu_mapiorange(0, virt_to_phys(va), res->start, len_total);
295  /*
296  * XXX That's where sdev would be used. Currently we load
297  * all iommu tables with the same translations.
298  */
299  if (sbus_map_dma_area(dev, dma_addrp, va, res->start, len_total) != 0)
300  goto err_noiommu;
301 
302  res->name = op->dev.of_node->name;
303 
304  return (void *)(unsigned long)res->start;
305 
306 err_noiommu:
307  release_resource(res);
308 err_nova:
309  kfree(res);
310 err_nomem:
311  free_pages(va, order);
312 err_nopages:
313  return NULL;
314 }
315 
316 static void sbus_free_coherent(struct device *dev, size_t n, void *p,
317  dma_addr_t ba, struct dma_attrs *attrs)
318 {
319  struct resource *res;
320  struct page *pgv;
321 
322  if ((res = lookup_resource(&_sparc_dvma,
323  (unsigned long)p)) == NULL) {
324  printk("sbus_free_consistent: cannot free %p\n", p);
325  return;
326  }
327 
328  if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
329  printk("sbus_free_consistent: unaligned va %p\n", p);
330  return;
331  }
332 
333  n = PAGE_ALIGN(n);
334  if (resource_size(res) != n) {
335  printk("sbus_free_consistent: region 0x%lx asked 0x%zx\n",
336  (long)resource_size(res), n);
337  return;
338  }
339 
340  release_resource(res);
341  kfree(res);
342 
343  pgv = virt_to_page(p);
344  sbus_unmap_dma_area(dev, ba, n);
345 
346  __free_pages(pgv, get_order(n));
347 }
348 
349 /*
350  * Map a chunk of memory so that devices can see it.
351  * CPU view of this memory may be inconsistent with
352  * a device view and explicit flushing is necessary.
353  */
354 static dma_addr_t sbus_map_page(struct device *dev, struct page *page,
355  unsigned long offset, size_t len,
356  enum dma_data_direction dir,
357  struct dma_attrs *attrs)
358 {
359  void *va = page_address(page) + offset;
360 
361  /* XXX why are some lengths signed, others unsigned? */
362  if (len <= 0) {
363  return 0;
364  }
365  /* XXX So what is maxphys for us and how do drivers know it? */
366  if (len > 256*1024) { /* __get_free_pages() limit */
367  return 0;
368  }
369  return mmu_get_scsi_one(dev, va, len);
370 }
371 
372 static void sbus_unmap_page(struct device *dev, dma_addr_t ba, size_t n,
373  enum dma_data_direction dir, struct dma_attrs *attrs)
374 {
375  mmu_release_scsi_one(dev, ba, n);
376 }
377 
378 static int sbus_map_sg(struct device *dev, struct scatterlist *sg, int n,
379  enum dma_data_direction dir, struct dma_attrs *attrs)
380 {
381  mmu_get_scsi_sgl(dev, sg, n);
382  return n;
383 }
384 
385 static void sbus_unmap_sg(struct device *dev, struct scatterlist *sg, int n,
386  enum dma_data_direction dir, struct dma_attrs *attrs)
387 {
388  mmu_release_scsi_sgl(dev, sg, n);
389 }
390 
391 static void sbus_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
392  int n, enum dma_data_direction dir)
393 {
394  BUG();
395 }
396 
397 static void sbus_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
398  int n, enum dma_data_direction dir)
399 {
400  BUG();
401 }
402 
403 struct dma_map_ops sbus_dma_ops = {
404  .alloc = sbus_alloc_coherent,
405  .free = sbus_free_coherent,
406  .map_page = sbus_map_page,
407  .unmap_page = sbus_unmap_page,
408  .map_sg = sbus_map_sg,
409  .unmap_sg = sbus_unmap_sg,
410  .sync_sg_for_cpu = sbus_sync_sg_for_cpu,
411  .sync_sg_for_device = sbus_sync_sg_for_device,
412 };
413 
414 static int __init sparc_register_ioport(void)
415 {
416  register_proc_sparc_ioport();
417 
418  return 0;
419 }
420 
421 arch_initcall(sparc_register_ioport);
422 
423 #endif /* CONFIG_SBUS */
424 
425 
426 /* Allocate and map kernel buffer using consistent mode DMA for a device.
427  * hwdev should be valid struct pci_dev pointer for PCI devices.
428  */
429 static void *pci32_alloc_coherent(struct device *dev, size_t len,
430  dma_addr_t *pba, gfp_t gfp,
431  struct dma_attrs *attrs)
432 {
433  unsigned long len_total = PAGE_ALIGN(len);
434  void *va;
435  struct resource *res;
436  int order;
437 
438  if (len == 0) {
439  return NULL;
440  }
441  if (len > 256*1024) { /* __get_free_pages() limit */
442  return NULL;
443  }
444 
445  order = get_order(len_total);
446  va = (void *) __get_free_pages(GFP_KERNEL, order);
447  if (va == NULL) {
448  printk("pci_alloc_consistent: no %ld pages\n", len_total>>PAGE_SHIFT);
449  goto err_nopages;
450  }
451 
452  if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
453  printk("pci_alloc_consistent: no core\n");
454  goto err_nomem;
455  }
456 
457  if (allocate_resource(&_sparc_dvma, res, len_total,
458  _sparc_dvma.start, _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
459  printk("pci_alloc_consistent: cannot occupy 0x%lx", len_total);
460  goto err_nova;
461  }
462  srmmu_mapiorange(0, virt_to_phys(va), res->start, len_total);
463 
464  *pba = virt_to_phys(va); /* equals virt_to_bus (R.I.P.) for us. */
465  return (void *) res->start;
466 
467 err_nova:
468  kfree(res);
469 err_nomem:
470  free_pages((unsigned long)va, order);
471 err_nopages:
472  return NULL;
473 }
474 
475 /* Free and unmap a consistent DMA buffer.
476  * cpu_addr is what was returned from pci_alloc_consistent,
477  * size must be the same as what as passed into pci_alloc_consistent,
478  * and likewise dma_addr must be the same as what *dma_addrp was set to.
479  *
480  * References to the memory and mappings associated with cpu_addr/dma_addr
481  * past this call are illegal.
482  */
483 static void pci32_free_coherent(struct device *dev, size_t n, void *p,
484  dma_addr_t ba, struct dma_attrs *attrs)
485 {
486  struct resource *res;
487 
488  if ((res = lookup_resource(&_sparc_dvma,
489  (unsigned long)p)) == NULL) {
490  printk("pci_free_consistent: cannot free %p\n", p);
491  return;
492  }
493 
494  if (((unsigned long)p & (PAGE_SIZE-1)) != 0) {
495  printk("pci_free_consistent: unaligned va %p\n", p);
496  return;
497  }
498 
499  n = PAGE_ALIGN(n);
500  if (resource_size(res) != n) {
501  printk("pci_free_consistent: region 0x%lx asked 0x%lx\n",
502  (long)resource_size(res), (long)n);
503  return;
504  }
505 
506  dma_make_coherent(ba, n);
507  srmmu_unmapiorange((unsigned long)p, n);
508 
509  release_resource(res);
510  kfree(res);
511  free_pages((unsigned long)phys_to_virt(ba), get_order(n));
512 }
513 
514 /*
515  * Same as pci_map_single, but with pages.
516  */
517 static dma_addr_t pci32_map_page(struct device *dev, struct page *page,
518  unsigned long offset, size_t size,
519  enum dma_data_direction dir,
520  struct dma_attrs *attrs)
521 {
522  /* IIep is write-through, not flushing. */
523  return page_to_phys(page) + offset;
524 }
525 
526 static void pci32_unmap_page(struct device *dev, dma_addr_t ba, size_t size,
527  enum dma_data_direction dir, struct dma_attrs *attrs)
528 {
529  if (dir != PCI_DMA_TODEVICE)
530  dma_make_coherent(ba, PAGE_ALIGN(size));
531 }
532 
533 /* Map a set of buffers described by scatterlist in streaming
534  * mode for DMA. This is the scather-gather version of the
535  * above pci_map_single interface. Here the scatter gather list
536  * elements are each tagged with the appropriate dma address
537  * and length. They are obtained via sg_dma_{address,length}(SG).
538  *
539  * NOTE: An implementation may be able to use a smaller number of
540  * DMA address/length pairs than there are SG table elements.
541  * (for example via virtual mapping capabilities)
542  * The routine returns the number of addr/length pairs actually
543  * used, at most nents.
544  *
545  * Device ownership issues as mentioned above for pci_map_single are
546  * the same here.
547  */
548 static int pci32_map_sg(struct device *device, struct scatterlist *sgl,
549  int nents, enum dma_data_direction dir,
550  struct dma_attrs *attrs)
551 {
552  struct scatterlist *sg;
553  int n;
554 
555  /* IIep is write-through, not flushing. */
556  for_each_sg(sgl, sg, nents, n) {
557  sg->dma_address = sg_phys(sg);
558  sg->dma_length = sg->length;
559  }
560  return nents;
561 }
562 
563 /* Unmap a set of streaming mode DMA translations.
564  * Again, cpu read rules concerning calls here are the same as for
565  * pci_unmap_single() above.
566  */
567 static void pci32_unmap_sg(struct device *dev, struct scatterlist *sgl,
568  int nents, enum dma_data_direction dir,
569  struct dma_attrs *attrs)
570 {
571  struct scatterlist *sg;
572  int n;
573 
574  if (dir != PCI_DMA_TODEVICE) {
575  for_each_sg(sgl, sg, nents, n) {
576  dma_make_coherent(sg_phys(sg), PAGE_ALIGN(sg->length));
577  }
578  }
579 }
580 
581 /* Make physical memory consistent for a single
582  * streaming mode DMA translation before or after a transfer.
583  *
584  * If you perform a pci_map_single() but wish to interrogate the
585  * buffer using the cpu, yet do not wish to teardown the PCI dma
586  * mapping, you must call this function before doing so. At the
587  * next point you give the PCI dma address back to the card, you
588  * must first perform a pci_dma_sync_for_device, and then the
589  * device again owns the buffer.
590  */
591 static void pci32_sync_single_for_cpu(struct device *dev, dma_addr_t ba,
592  size_t size, enum dma_data_direction dir)
593 {
594  if (dir != PCI_DMA_TODEVICE) {
595  dma_make_coherent(ba, PAGE_ALIGN(size));
596  }
597 }
598 
599 static void pci32_sync_single_for_device(struct device *dev, dma_addr_t ba,
600  size_t size, enum dma_data_direction dir)
601 {
602  if (dir != PCI_DMA_TODEVICE) {
603  dma_make_coherent(ba, PAGE_ALIGN(size));
604  }
605 }
606 
607 /* Make physical memory consistent for a set of streaming
608  * mode DMA translations after a transfer.
609  *
610  * The same as pci_dma_sync_single_* but for a scatter-gather list,
611  * same rules and usage.
612  */
613 static void pci32_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl,
614  int nents, enum dma_data_direction dir)
615 {
616  struct scatterlist *sg;
617  int n;
618 
619  if (dir != PCI_DMA_TODEVICE) {
620  for_each_sg(sgl, sg, nents, n) {
621  dma_make_coherent(sg_phys(sg), PAGE_ALIGN(sg->length));
622  }
623  }
624 }
625 
626 static void pci32_sync_sg_for_device(struct device *device, struct scatterlist *sgl,
627  int nents, enum dma_data_direction dir)
628 {
629  struct scatterlist *sg;
630  int n;
631 
632  if (dir != PCI_DMA_TODEVICE) {
633  for_each_sg(sgl, sg, nents, n) {
634  dma_make_coherent(sg_phys(sg), PAGE_ALIGN(sg->length));
635  }
636  }
637 }
638 
640  .alloc = pci32_alloc_coherent,
641  .free = pci32_free_coherent,
642  .map_page = pci32_map_page,
643  .unmap_page = pci32_unmap_page,
644  .map_sg = pci32_map_sg,
645  .unmap_sg = pci32_unmap_sg,
646  .sync_single_for_cpu = pci32_sync_single_for_cpu,
647  .sync_single_for_device = pci32_sync_single_for_device,
648  .sync_sg_for_cpu = pci32_sync_sg_for_cpu,
649  .sync_sg_for_device = pci32_sync_sg_for_device,
650 };
651 EXPORT_SYMBOL(pci32_dma_ops);
652 
653 /* leon re-uses pci32_dma_ops */
655 EXPORT_SYMBOL(leon_dma_ops);
656 
657 struct dma_map_ops *dma_ops = &sbus_dma_ops;
658 EXPORT_SYMBOL(dma_ops);
659 
660 
661 /*
662  * Return whether the given PCI device DMA address mask can be
663  * supported properly. For example, if your device can only drive the
664  * low 24-bits during PCI bus mastering, then you would pass
665  * 0x00ffffff as the mask to this function.
666  */
667 int dma_supported(struct device *dev, u64 mask)
668 {
669 #ifdef CONFIG_PCI
670  if (dev->bus == &pci_bus_type)
671  return 1;
672 #endif
673  return 0;
674 }
676 
677 #ifdef CONFIG_PROC_FS
678 
679 static int sparc_io_proc_show(struct seq_file *m, void *v)
680 {
681  struct resource *root = m->private, *r;
682  const char *nm;
683 
684  for (r = root->child; r != NULL; r = r->sibling) {
685  if ((nm = r->name) == 0) nm = "???";
686  seq_printf(m, "%016llx-%016llx: %s\n",
687  (unsigned long long)r->start,
688  (unsigned long long)r->end, nm);
689  }
690 
691  return 0;
692 }
693 
694 static int sparc_io_proc_open(struct inode *inode, struct file *file)
695 {
696  return single_open(file, sparc_io_proc_show, PDE(inode)->data);
697 }
698 
699 static const struct file_operations sparc_io_proc_fops = {
700  .owner = THIS_MODULE,
701  .open = sparc_io_proc_open,
702  .read = seq_read,
703  .llseek = seq_lseek,
704  .release = single_release,
705 };
706 #endif /* CONFIG_PROC_FS */
707 
708 static void register_proc_sparc_ioport(void)
709 {
710 #ifdef CONFIG_PROC_FS
711  proc_create_data("io_map", 0, NULL, &sparc_io_proc_fops, &sparc_iomap);
712  proc_create_data("dvma_map", 0, NULL, &sparc_io_proc_fops, &_sparc_dvma);
713 #endif
714 }