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/* $Id: iommu_common.h,v 1.1.1.1 2004-04-15 01:34:43 phoenix Exp $

 * iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.

 *

 * Copyright (C) 1999 David S. Miller (davem@redhat.com)

 */

#include <linux/kernel.h>

#include <linux/types.h>

#include <linux/sched.h>

#include <linux/mm.h>

#include <asm/iommu.h>

#include <asm/scatterlist.h>

/*

 * These give mapping size of each iommu pte/tlb.

 */

#define IO_PAGE_SHIFT                   13

#define IO_PAGE_SIZE                    (1UL << IO_PAGE_SHIFT)

#define IO_PAGE_MASK                    (~(IO_PAGE_SIZE-1))

#define IO_PAGE_ALIGN(addr)             (((addr)+IO_PAGE_SIZE-1)&IO_PAGE_MASK)

#define IO_TSB_ENTRIES                  (128*1024)

#define IO_TSB_SIZE                     (IO_TSB_ENTRIES * 8)

/*

 * This is the hardwired shift in the iotlb tag/data parts.

 */

#define IOMMU_PAGE_SHIFT                13

/* You are _strongly_ advised to enable the following debugging code

 * any time you make changes to the sg code below, run it for a while

 * with filesystems mounted read-only before buying the farm... -DaveM

 */

#undef VERIFY_SG

#ifdef VERIFY_SG

extern void verify_sglist(struct scatterlist *sg, int nents, iopte_t *iopte, int npages);

#endif

/* Two addresses are "virtually contiguous" if and only if:

 * 1) They are equal, or...

 * 2) They are both on a page boundry

 */

#define VCONTIG(__X, __Y)       (((__X) == (__Y)) || \

                                 (((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL)

extern unsigned long prepare_sg(struct scatterlist *sg, int nents);