arch/sparc64/kernel/iommu_common.h

   1 /* $Id: iommu_common.h,v 1.5 2001/12/11 09:41:01 davem 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 #include <linux/sched.h>
  10 #include <linux/mm.h>
  11
  12 #include <asm/iommu.h>
  13 #include <asm/scatterlist.h>
  14
  15 /*
  16  * These give mapping size of each iommu pte/tlb.
  17  */
  18 #define IO_PAGE_SHIFT                   13
  19 #define IO_PAGE_SIZE                    (1UL << IO_PAGE_SHIFT)
  20 #define IO_PAGE_MASK                    (~(IO_PAGE_SIZE-1))
  21 #define IO_PAGE_ALIGN(addr)             (((addr)+IO_PAGE_SIZE-1)&IO_PAGE_MASK)
  22
  23 #define IO_TSB_ENTRIES                  (128*1024)
  24 #define IO_TSB_SIZE                     (IO_TSB_ENTRIES * 8)
  25
  26 /*
  27  * This is the hardwired shift in the iotlb tag/data parts.
  28  */
  29 #define IOMMU_PAGE_SHIFT                13
  30
  31 /* You are _strongly_ advised to enable the following debugging code
  32  * any time you make changes to the sg code below, run it for a while
  33  * with filesystems mounted read-only before buying the farm... -DaveM
  34  */
  35 #undef VERIFY_SG
  36
  37 #ifdef VERIFY_SG
  38 extern void verify_sglist(struct scatterlist *sg, int nents, iopte_t *iopte, int npages);
  39 #endif
  40
  41 /* Two addresses are "virtually contiguous" if and only if:
  42  * 1) They are equal, or...
  43  * 2) They are both on a page boundary
  44  */
  45 #define VCONTIG(__X, __Y)       (((__X) == (__Y)) || \
  46                                  (((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL)
  47
  48 extern unsigned long prepare_sg(struct scatterlist *sg, int nents);