/* $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 <linux/scatterlist.h> #include <linux/device.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 #define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG)))) static inline unsigned long iommu_num_pages(unsigned long vaddr, unsigned long slen) { unsigned long npages; npages = IO_PAGE_ALIGN(vaddr + slen) - (vaddr & IO_PAGE_MASK); npages >>= IO_PAGE_SHIFT; return npages; } static inline unsigned long calc_npages(struct scatterlist *sglist, int nelems) { unsigned long i, npages = 0; struct scatterlist *sg; for_each_sg(sglist, sg, nelems, i) { unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg); npages += iommu_num_pages(paddr, sg->length); } return npages; } /* 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 device *dev, struct scatterlist *sg, int nents);