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152 lines
2.6 KiB
C
152 lines
2.6 KiB
C
/* Copyright (C) 2021,2022 fef <owo@fef.moe>. All rights reserved. */
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#pragma once
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/** @brief I/O port number for the PIC1 command channel */
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#define X86_PORT_PIC1_CMD 0x20
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/** @brief I/O port number for the PIC1 data channel */
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#define X86_PORT_PIC1_DATA 0x21
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/** @brief I/O port number for the keyboard data channel */
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#define X86_PORT_KBD_DATA 0x60
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/** @brief I/O port number for the keyboard status channel */
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#define X86_PORT_KBD_STATUS 0x64
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/** @brief I/O port number for the PIC2 command channel */
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#define X86_PORT_PIC2_CMD 0xa0
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/** @brief I/O port number for the PIC2 data channel */
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#define X86_PORT_PIC2_DATA 0xa1
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#ifndef _ASM_SOURCE
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#include <gay/cdefs.h>
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#include <gay/types.h>
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/**
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* @brief Read a byte from the I/O bus.
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*
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* @param port Port number
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* @return The byte that was read
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*/
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static inline u8 x86_inb(u16 port)
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{
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u8 data;
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__asm__ volatile(
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" inb %w1, %b0 \n"
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: "=a"(data)
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: "Nd"(port)
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);
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return data;
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}
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/**
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* @brief Read a word from the I/O bus.
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*
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* @param port Port number
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* @return The word that was read
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*/
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static inline u16 x86_inw(u16 port)
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{
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u16 data;
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__asm__ volatile(
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" inw %w1, %w0 \n"
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: "=a"(data)
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: "Nd"(port)
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);
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return data;
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}
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/**
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* @brief Read a longword from the I/O bus.
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*
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* @param port Port number
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* @return The longword that was read
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*/
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static inline u32 x86_inl(u16 port)
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{
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u32 data;
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__asm__ volatile(
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" inl %w1, %l0 \n"
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: "=a"(data)
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: "Nd"(port)
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);
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return data;
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}
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/**
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* @brief Write a byte to the I/O bus.
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*
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* @param port Port number
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* @param data Byte to send through the port
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*/
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static inline void x86_outb(u16 port, u8 data)
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{
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__asm__ volatile(
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" outb %b0, %w1 \n"
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:
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: "a"(data), "Nd"(port)
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);
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}
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/**
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* @brief Write a word to the I/O bus.
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*
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* @param port Port number
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* @param data Word to send through the port
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*/
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static inline void x86_outw(u16 port, u16 data)
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{
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__asm__ volatile(
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" outw %w0, %w1 \n"
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:
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: "a"(data), "Nd"(port)
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);
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}
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/**
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* @brief Write a longword to the I/O bus.
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*
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* @param port Port number
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* @param data Longword to send through the port
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*/
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static inline void x86_outl(u16 port, u32 data)
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{
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__asm__ volatile(
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" outl %l0, %w1 \n"
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:
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: "a"(data), "Nd"(port)
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);
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}
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/** @brief Induce a brief CPU delay by writing zero to I/O port `0x80`. */
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static inline void x86_io_wait(void)
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{
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x86_outb(0x80, 0);
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}
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static __always_inline void x86_outb_wait(u16 port, u8 data)
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{
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x86_outb(port, data);
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x86_io_wait();
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}
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static __always_inline void x86_outw_wait(u16 port, u16 data)
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{
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x86_outw(port, data);
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x86_io_wait();
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}
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static __always_inline void x86_outl_wait(u16 port, u32 data)
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{
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x86_outl(port, data);
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x86_io_wait();
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}
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#endif /* not _ASM_SOURCE */
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