102 lines
1.9 KiB
C
102 lines
1.9 KiB
C
/*
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Copyright (C) 2015-2019 The University of Notre Dame
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This software is distributed under the GNU General Public License.
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See the file LICENSE for details.
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*/
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#ifndef IOPORTS_H
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#define IOPORTS_H
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#include "kernel/types.h"
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/*
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These are C wrappers around the assembly instruction IN and OUT
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to move data to and from I/O ports. These variants are historically
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called inb/inw/inl outb/outw/outl for in/out of byte (8 bits),
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word (16 bits), and long (32 bits) respectively.
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Note that some devices requires the "slow" variants that do an
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extra dummy I/O in order to give the device more time to respond.
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*/
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static inline uint8_t inb(int port)
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{
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uint8_t result;
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asm("inb %w1, %b0": "=a"(result):"Nd"(port));
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return result;
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}
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static inline uint16_t inw(int port)
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{
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uint16_t result;
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asm("inw %w1, %w0": "=a"(result):"Nd"(port));
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return result;
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}
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static inline uint16_t inl(int port)
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{
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uint32_t result;
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asm("inl %w1, %0": "=a"(result):"Nd"(port));
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return result;
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}
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static inline void outb(uint8_t value, int port)
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{
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asm("outb %b0, %w1": :"a"(value), "Nd"(port));
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}
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static inline void outw(uint16_t value, int port)
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{
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asm("outw %w0, %w1": :"a"(value), "Nd"(port));
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}
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static inline void outl(uint32_t value, int port)
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{
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asm("outl %0, %w1": :"a"(value), "Nd"(port));
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}
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static inline void iowait()
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{
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outb(0, 0x80);
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}
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static inline uint8_t inb_slow(int port)
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{
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uint8_t result = inb(port);
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iowait();
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return result;
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}
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static inline uint16_t inw_slow(int port)
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{
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uint16_t result = inw(port);
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iowait();
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return result;
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}
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static inline uint32_t inl_slow(int port)
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{
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uint32_t result = inl(port);
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iowait();
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return result;
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}
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static inline void outb_slow(uint8_t value, int port)
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{
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outb(value, port);
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iowait();
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}
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static inline void outw_slow(uint16_t value, int port)
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{
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outw(value, port);
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iowait();
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}
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static inline void outl_slow(uint32_t value, int port)
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{
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outl(value, port);
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iowait();
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}
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#endif
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