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کامپیوتر و شبکه::
دسترسی مستقیم به حافظه(DMA)
This mechanism supports two types of direct memory access (DMA) 2.
First, for premapped DMA, the SPM authorizes access to the device and the memory prior to the first request only.
Second, for mapped I/O, the I/O addresses for DMA are sent to the device.
2Direct memory access (DMA) enables devices to write into the system's physical memory without involving the system's CPU.
As a result, such systems are vulnerable to DMA devices.
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