58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/* $Id: iommu_common.h,v 1.5 2001/12/11 09:41:01 davem Exp $
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* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
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*
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* Copyright (C) 1999 David S. Miller (davem@redhat.com)
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <linux/device.h>
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#include <asm/iommu.h>
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#include <asm/scatterlist.h>
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/*
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* These give mapping size of each iommu pte/tlb.
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*/
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#define IO_PAGE_SHIFT 13
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#define IO_PAGE_SIZE (1UL << IO_PAGE_SHIFT)
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#define IO_PAGE_MASK (~(IO_PAGE_SIZE-1))
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#define IO_PAGE_ALIGN(addr) (((addr)+IO_PAGE_SIZE-1)&IO_PAGE_MASK)
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#define IO_TSB_ENTRIES (128*1024)
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#define IO_TSB_SIZE (IO_TSB_ENTRIES * 8)
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/*
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* This is the hardwired shift in the iotlb tag/data parts.
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*/
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#define IOMMU_PAGE_SHIFT 13
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#define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG))))
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static inline unsigned long iommu_num_pages(unsigned long vaddr,
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unsigned long slen)
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{
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unsigned long npages;
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npages = IO_PAGE_ALIGN(vaddr + slen) - (vaddr & IO_PAGE_MASK);
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npages >>= IO_PAGE_SHIFT;
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return npages;
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}
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static inline unsigned long calc_npages(struct scatterlist *sglist, int nelems)
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{
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unsigned long i, npages = 0;
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struct scatterlist *sg;
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for_each_sg(sglist, sg, nelems, i) {
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unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg);
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npages += iommu_num_pages(paddr, sg->length);
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}
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return npages;
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}
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