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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);