diff options
Diffstat (limited to 'arch/sparc64/kernel/iommu_common.h')
| -rw-r--r-- | arch/sparc64/kernel/iommu_common.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/iommu_common.h b/arch/sparc64/kernel/iommu_common.h new file mode 100644 index 000000000..30cbd4385 --- /dev/null +++ b/arch/sparc64/kernel/iommu_common.h @@ -0,0 +1,34 @@ +/* $Id: iommu_common.h,v 1.1 1999/12/17 12:31:54 jj 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 <asm/page.h> +#include <asm/iommu.h> +#include <asm/scatterlist.h> + +/* 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 +int verify_lengths(struct scatterlist *sg, int nents, int npages); +int verify_one_map(struct scatterlist *dma_sg, struct scatterlist **__sg, int nents, iopte_t **__iopte); +int verify_maps(struct scatterlist *sg, int nents, iopte_t *iopte); +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 boundry + */ +#define VCONTIG(__X, __Y) (((__X) == (__Y)) || \ + (((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL) + +unsigned long prepare_sg(struct scatterlist *sg, int nents); |