34 lines
704 B
C
34 lines
704 B
C
/*
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* ports.c
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*
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* Created on: Aug 18, 2019
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* Author: rick
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*/
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#include "ports.h"
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/**
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* Read a byte from the specified port
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*/
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unsigned char port_byte_in(unsigned short port) {
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unsigned char result;
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__asm__("in %%dx, %%al" : "=a" (result) : "d" (port));
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return result;
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}
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void port_byte_out(unsigned short port, unsigned char data) {
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__asm__("out %%al, %%dx" : : "a" (data), "d" (port));
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}
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unsigned short port_word_in(unsigned short port) {
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unsigned short result;
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__asm__("in %%dx, %%ax" : "=a" (result) : "d" (port));
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return result;
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}
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void port_wordt_out(unsigned short port, unsigned short data) {
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__asm__("out %%ax, %%dx" : : "a" (data), "d" (port));
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}
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