DNT MemoPen Data manuels

Dnt MemoPen Data Spécifications (52 pages)

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Table des matières

Memory Mapping

1

Address Types

2

Physical Addresses and Pages

4

High and Low Memory

4

Page Tables

7

Virtual Memory Areas

8

The vm_area_struct structure

9

Memory Management in Linux

10

The mmap Device Operation

11

Using remap_pfn_range

13

A Simple Implementation

14

Adding VMA Operations

15

Mapping Memory with nopage

16

Remapping Speciﬁc I/O Regions

18

Remapping RAM

19

0 when opened for

20

Performing Direct I/O

24

Asynchronous I/O

26

An asynchronous I/O example

28

Direct Memory Access

29

Allocating the DMA Buffer

31

Bus Addresses

32

The Generic DMA Layer

33

DMA mappings

34

DMA pools

36

Scatter/gather mappings

39

A simple PCI DMA example

42

DMA for ISA Devices

43

Registering DMA usage

44

Talking to the DMA controller

45

Quick Reference

48

Implementing mmap

49

Implementing Direct I/O

49

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