1 /* $Id: iommu_common.h,v 1.4.2.1 2001/12/11 22:47:27 davem Exp $
2  * iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
3  *
4  * Copyright (C) 1999 David S. Miller (davem@redhat.com)
5  */
6 
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/sched.h>
10 #include <linux/mm.h>
11 
12 #include <asm/iommu.h>
13 #include <asm/scatterlist.h>
14 
15 /*
16  * These give mapping size of each iommu pte/tlb.
17  */
18 #define IO_PAGE_SHIFT			13
19 #define IO_PAGE_SIZE			(1UL << IO_PAGE_SHIFT)
20 #define IO_PAGE_MASK			(~(IO_PAGE_SIZE-1))
21 #define IO_PAGE_ALIGN(addr)		(((addr)+IO_PAGE_SIZE-1)&IO_PAGE_MASK)
22 
23 #define IO_TSB_ENTRIES			(128*1024)
24 #define IO_TSB_SIZE			(IO_TSB_ENTRIES * 8)
25 
26 /*
27  * This is the hardwired shift in the iotlb tag/data parts.
28  */
29 #define IOMMU_PAGE_SHIFT		13
30 
31 /* You are _strongly_ advised to enable the following debugging code
32  * any time you make changes to the sg code below, run it for a while
33  * with filesystems mounted read-only before buying the farm... -DaveM
34  */
35 #undef VERIFY_SG
36 
37 #ifdef VERIFY_SG
38 extern void verify_sglist(struct scatterlist *sg, int nents, iopte_t *iopte, int npages);
39 #endif
40 
41 /* Two addresses are "virtually contiguous" if and only if:
42  * 1) They are equal, or...
43  * 2) They are both on a page boundry
44  */
45 #define VCONTIG(__X, __Y)	(((__X) == (__Y)) || \
46 				 (((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL)
47 
48 extern unsigned long prepare_sg(struct scatterlist *sg, int nents);
49