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    SubjectRe: [PATCH 18 of 38] x86: unify pci iommu setup and allow swiotlb to compile for 32 bit
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    On Thu, 13 Nov 2008 11:10:16 -0800
    Jeremy Fitzhardinge <jeremy@goop.org> wrote:

    > swiotlb on 32 bit will be used by Xen domain 0 support.

    If you want swiotlb on 32 bit, you need more modifications, I think.

    For example, the following code assumes that the mask needs to be
    64 bits.

    static void *
    map_single(struct device *hwdev, char *buffer, size_t size, int dir)
    {
    unsigned long flags;
    char *dma_addr;
    unsigned int nslots, stride, index, wrap;
    int i;
    unsigned long start_dma_addr;
    unsigned long mask;
    unsigned long offset_slots;
    unsigned long max_slots;

    mask = dma_get_seg_boundary(hwdev);
    start_dma_addr = virt_to_bus(io_tlb_start) & mask;

    offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
    max_slots = mask + 1
    ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT
    : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);



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