1 /* $Id: iommu_common.h,v 1.5 2001/12/11 09:41:01 davem Exp $
2 * iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
4 * Copyright (C) 1999 David S. Miller (davem@redhat.com)
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/sched.h>
11 #include <linux/scatterlist.h>
12 #include <linux/device.h>
14 #include <asm/iommu.h>
15 #include <asm/scatterlist.h>
18 * These give mapping size of each iommu pte/tlb.
20 #define IO_PAGE_SHIFT 13
21 #define IO_PAGE_SIZE (1UL << IO_PAGE_SHIFT)
22 #define IO_PAGE_MASK (~(IO_PAGE_SIZE-1))
23 #define IO_PAGE_ALIGN(addr) (((addr)+IO_PAGE_SIZE-1)&IO_PAGE_MASK)
25 #define IO_TSB_ENTRIES (128*1024)
26 #define IO_TSB_SIZE (IO_TSB_ENTRIES * 8)
29 * This is the hardwired shift in the iotlb tag/data parts.
31 #define IOMMU_PAGE_SHIFT 13
33 /* You are _strongly_ advised to enable the following debugging code
34 * any time you make changes to the sg code below, run it for a while
35 * with filesystems mounted read-only before buying the farm... -DaveM
40 extern void verify_sglist(struct scatterlist *sg, int nents, iopte_t *iopte, int npages);
43 /* Two addresses are "virtually contiguous" if and only if:
44 * 1) They are equal, or...
45 * 2) They are both on a page boundary
47 #define VCONTIG(__X, __Y) (((__X) == (__Y)) || \
48 (((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL)
50 extern unsigned long prepare_sg(struct device *dev, struct scatterlist *sg, int nents);