Messages in this thread | | | Date | Mon, 17 Nov 2008 12:48:53 +0900 | Subject | Re: [PATCH 18 of 38] x86: unify pci iommu setup and allow swiotlb to compile for 32 bit | From | FUJITA Tomonori <> |
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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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