projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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. | |
| 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 boundary | |
| 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); |