mirror of
https://github.com/SerenityOS/serenity
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151 lines
3.6 KiB
C++
151 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/String.h>
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#include <AK/Types.h>
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namespace IO {
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// Every character written to this IO port is written to the Bochs console
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// (e.g. the console where Qemu is running).
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static constexpr u16 BOCHS_DEBUG_PORT = 0xE9;
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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 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 delay(size_t microseconds)
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{
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for (size_t i = 0; i < microseconds; ++i)
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IO::in8(0x80);
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}
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}
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class IOAddress {
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public:
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IOAddress() = default;
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explicit IOAddress(u16 address)
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: m_address(address)
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{
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}
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IOAddress offset(u16 o) const { return IOAddress(m_address + o); }
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u16 get() const { return m_address; }
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void set(u16 address) { m_address = address; }
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void mask(u16 m) { m_address &= m; }
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template<typename T>
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ALWAYS_INLINE T in()
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{
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static_assert(sizeof(T) <= 4);
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if constexpr (sizeof(T) == 4)
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return IO::in32(get());
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if constexpr (sizeof(T) == 2)
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return IO::in16(get());
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if constexpr (sizeof(T) == 1)
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return IO::in8(get());
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VERIFY_NOT_REACHED();
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}
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template<typename T>
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ALWAYS_INLINE void out(T value)
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{
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static_assert(sizeof(T) <= 4);
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if constexpr (sizeof(T) == 4) {
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IO::out32(get(), value);
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return;
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}
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if constexpr (sizeof(T) == 2) {
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IO::out16(get(), value);
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return;
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}
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if constexpr (sizeof(T) == 1) {
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IO::out8(get(), value);
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return;
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}
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VERIFY_NOT_REACHED();
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}
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inline void out(u32 value, u8 bit_width)
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{
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if (bit_width == 32) {
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IO::out32(get(), value);
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return;
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}
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if (bit_width == 16) {
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IO::out16(get(), value);
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return;
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}
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if (bit_width == 8) {
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IO::out8(get(), value);
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return;
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}
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VERIFY_NOT_REACHED();
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}
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bool is_null() const { return m_address == 0; }
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bool operator==(const IOAddress& other) const { return m_address == other.m_address; }
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bool operator!=(const IOAddress& other) const { return m_address != other.m_address; }
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bool operator>(const IOAddress& other) const { return m_address > other.m_address; }
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bool operator>=(const IOAddress& other) const { return m_address >= other.m_address; }
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bool operator<(const IOAddress& other) const { return m_address < other.m_address; }
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bool operator<=(const IOAddress& other) const { return m_address <= other.m_address; }
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private:
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u16 m_address { 0 };
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};
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template<>
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struct AK::Formatter<IOAddress> : AK::Formatter<FormatString> {
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void format(FormatBuilder& builder, IOAddress value)
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{
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return Formatter<FormatString>::format(builder, "IO {:x}", value.get());
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}
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};
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