84 lines
1.2 KiB
C++
84 lines
1.2 KiB
C++
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/* IO.hh
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* vim: set tw=80:
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* Eryn Wells <eryn@erynwells.me>
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*/
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/**
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* Low-level hardware I/O functions.
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*/
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#ifndef __IO_HH__
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#define __IO_HH__
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#include <stdint.h>
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namespace kernel {
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namespace io {
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/*
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* Input
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*/
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inline uint8_t
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inb(uint16_t port)
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{
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uint8_t ret;
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asm volatile("inb %[port], %[ret]",
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: [result] "=a"(ret)
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: [port] "Nd"(port));
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return ret;
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}
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inline uint16_t
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inw(uint16_t port)
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{
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uint16_t ret;
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asm volatile("inw %[port], %[ret]",
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: [result] "=a"(ret)
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: [port] "Nd"(port));
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return ret;
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}
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inline uint32_t
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inl(uint16_t port)
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{
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uint32_t ret;
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asm volatile("inl %[port], %[ret]",
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: [result] "=a"(ret)
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: [port] "Nd"(port));
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return ret;
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}
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/*
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* Output
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*/
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inline void
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outb(uint16_t port,
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uint8_t value)
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{
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asm volatile("outb %0, %1" : : "a"(value), "Nd"(port));
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}
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inline void
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outw(uint16_t port,
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uint16_t value)
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{
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asm volatile("outw %0, %1" : : "a"(value), "Nd"(port));
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}
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inline void
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outl(uint16_t port,
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uint32_t value)
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{
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asm volatile("outl %0, %1" : : "a"(value), "Nd"(port));
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}
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} /* namespace io */
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} /* namespace kernel */
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#endif /* __IO_HH__ */
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