84 lines
1.5 KiB
Text
84 lines
1.5 KiB
Text
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.TH INB 9
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.SH NAME
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inb, ins, inl, outb, outs, outl, insb, inss, insl, outsb, outss, outsl \- programmed I/O
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.SH SYNOPSIS
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.ta \w'\fLushort 'u
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.B
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int inb(int port)
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.PP
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.B
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ushort ins(int port)
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.PP
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.B
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ulong inl(int port)
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.PP
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.B
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void outb(int port, int value)
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.PP
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.B
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void outs(int port, ushort value)
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.PP
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.B
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void outl(int port, ulong value)
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.PP
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.B
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void insb(int port, void *address, int count)
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.PP
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.B
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void inss(int port, void *address, int count)
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.PP
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.B
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void insl(int port, void *address, int count)
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.PP
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.B
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void outsb(int port, void *address, int count)
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.PP
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.B
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void outss(int port, void *address, int count)
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.PP
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.B
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void outsl(int port, void *address, int count)
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.SH DESCRIPTION
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The
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.I x86
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implementation provides functions to allow kernel code
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written in C to access the I/O address space.
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On several other architectures such as the PowerPC and Strongarm,
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the platform-dependent code provides similar functions to access
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devices with an I/O space interface, even when that is memory mapped, to encourage portability of device drivers.
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.PP
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.IR Inb ,
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.I ins
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and
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.I inl
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apply the corresponding hardware instruction to fetch the next byte, short or long
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from the I/O
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.IR port .
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.IR Outb ,
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.I outs
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and
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.I outl
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output a
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.I value
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to the I/O
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.IR port .
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.PP
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The remaining functions transfer
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.I count
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bytes, shorts, or longs using programmed I/O between a memory
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.I address
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and
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.IR port .
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Functions
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.B insX
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copy values into memory; functions
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.B outsX
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copy values from memory.
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The
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.I count
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is in elements, not bytes.
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.SH SOURCE
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.B /sys/src/9/pc/l.s
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.SH SEE ALSO
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.IR dma (9)
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