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103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Types.h>
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#if defined(KERNEL)
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# include <Kernel/Arch/i386/CPU.h>
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# include <Kernel/Devices/VMWareBackdoor.h>
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#endif
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namespace IO {
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inline u8 in8(u16 port)
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{
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u8 value;
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asm volatile("inb %1, %0"
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: "=a"(value)
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: "Nd"(port));
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return value;
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}
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inline u16 in16(u16 port)
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{
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u16 value;
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asm volatile("inw %1, %0"
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: "=a"(value)
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: "Nd"(port));
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return value;
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}
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inline u32 in32(u16 port)
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{
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u32 value;
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asm volatile("inl %1, %0"
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: "=a"(value)
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: "Nd"(port));
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return value;
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}
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inline void repeated_in16(u16 port, u8* buffer, int buffer_size)
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{
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asm volatile("rep insw"
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: "+D"(buffer), "+c"(buffer_size)
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: "d"(port)
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: "memory");
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}
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inline void out8(u16 port, u8 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 out16(u16 port, u16 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 out32(u16 port, u32 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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inline void repeated_out16(u16 port, const u8* data, int data_size)
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{
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asm volatile("rep outsw"
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: "+S"(data), "+c"(data_size)
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: "d"(port));
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}
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inline void delay()
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{
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// ~3 microsecs
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for (auto i = 0; i < 32; i++) {
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IO::in8(0x80);
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}
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}
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}
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