| /* $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 <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 |
| |
| /* 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 scatterlist *sg, int nents); |