arch/sparc64/kernel/iommu_common.h

   1 /* $Id: iommu_common.h,v 1.1 1999/12/17 12:31:54 jj Exp $
   2  * iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
   3  *
   4  * Copyright (C) 1999 David S. Miller (davem@redhat.com)
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/types.h>
   9
  10 #include <asm/page.h>
  11 #include <asm/iommu.h>
  12 #include <asm/scatterlist.h>
  13
  14 /* You are _strongly_ advised to enable the following debugging code
  15  * any time you make changes to the sg code below, run it for a while
  16  * with filesystems mounted read-only before buying the farm... -DaveM
  17  */
  18 #undef VERIFY_SG
  19
  20 #ifdef VERIFY_SG
  21 int verify_lengths(struct scatterlist *sg, int nents, int npages);
  22 int verify_one_map(struct scatterlist *dma_sg, struct scatterlist **__sg, int nents, iopte_t **__iopte);
  23 int verify_maps(struct scatterlist *sg, int nents, iopte_t *iopte);
  24 void verify_sglist(struct scatterlist *sg, int nents, iopte_t *iopte, int npages);
  25 #endif
  26
  27 /* Two addresses are "virtually contiguous" if and only if:
  28  * 1) They are equal, or...
  29  * 2) They are both on a page boundry
  30  */
  31 #define VCONTIG(__X, __Y)       (((__X) == (__Y)) || \
  32                                  (((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL)
  33
  34 unsigned long prepare_sg(struct scatterlist *sg, int nents);