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/* $Id: iommu_common.h,v 1.5 2001/12/11 09:41:01 davem 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 boundary
*/
#define VCONTIG(__X, __Y) (((__X) == (__Y)) || \
(((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL)
extern unsigned long prepare_sg(struct scatterlist *sg, int nents);
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