Direct memory access (DMA) adalah suatu alat pengendali khusus disediakan untuk memungkinkan transfes blok data langsung antar perangkat eksternal dan memori utama, tanpa intervensi terus menerus dari prosesor. Sebagai hasil perbandingan, pada mode PIO arduous disk pengasuh membutuhkan resource CPU di atas 70% untuk membaca onerous disk, tapi pada mode DMA resource yang digunakan hanya 6% saja.
DMA Attacks require entry to bodily reminiscence, whereby the malicious code can entry the kernel deal with area, device deal about with area and registers and different vital constructions and information.
DMA controller yang ada pada sistem ISA memiliki kecepatan yang sangat rendah sehingga sangat riskan untuk digunakan bersama arduous disk keluaran baru, sedangkan DMA controller pada VLBUS hanya mendukung busmastering DMA.
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By using Map Registers, drivers are in a position to reference digital logic deal with space somewhat than reference physical address house, nonetheless, keep in mind that DMA nonetheless only uses bodily memory addresses to complete transfers.
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