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Define DMA address and direction types

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As a preliminary to adding more extensive DMA and IOMMU infrastructure
support into qemu, this patch defines a dma_addr_t for storing DMA bus
addresses and a DMADirection enum which describes whether a DMA is
from an external device to main memory or from main memory to an
external device.

For now dma_addr_t is just defined to be target_phys_addr_t, but in
future, we can change this to support machines where we have bus
addresses which don't necessarily have the same format as CPU physical
addresses.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
David Gibson 2011-10-31 17:06:45 +11:00 committed by Anthony Liguori
parent 7f540ab524
commit d9d1055ef1
1 changed files with 9 additions and 0 deletions
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9
dma.h
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@ -18,6 +18,15 @@
typedef struct ScatterGatherEntry ScatterGatherEntry;
#if defined(TARGET_PHYS_ADDR_BITS)
typedef target_phys_addr_t dma_addr_t;
#define DMA_ADDR_FMT TARGET_FMT_plx
typedef enum {
DMA_DIRECTION_TO_DEVICE = 0,
DMA_DIRECTION_FROM_DEVICE = 1,
} DMADirection;
struct ScatterGatherEntry {
target_phys_addr_t base;
target_phys_addr_t len;