On Tue, 19 Jun 2007 14:37:06 -0700 "Keshavamurthy, Anil S" <[email protected]> wrote:
> Actual intel IOMMU driver. Hardware spec can be found at:
> http://www.intel.com/technology/virtualization
>
> This driver sets X86_64 'dma_ops', so hook into standard DMA APIs. In this way,
> PCI driver will get virtual DMA address. This change is transparent to PCI
> drivers.
>
> Changes from previous postings:
> 1) Fixed all the coding style errors - checkpatches.pl passes this patch
> 2) Addressed all Andrew's comments
> 3) Removed resource pool ( a.k.a pre-allocate pool)
> 4) Now uses the standard kmem_cache_alloc functions to allocate memory
> during dma map api calls.
>
>
> ...
> +#define context_set_translation_type(c, val) \
> + do { \
> + (c).lo &= (((u64)-1) << 4) | 3; \
> + (c).lo |= ((val) & 3) << 2; \
> + } while (0)
That evaluates `c' twice. It's a little handgrenade waiting to go off.
> +#define context_clear_entry(c) do {(c).lo = 0; (c).hi = 0;} while (0)
Ditto
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