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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/Format.h>
#include <AK/Types.h>
#include <AK/Platform.h>
VALIDATE_IS_X86()
namespace IO {
// Every character written to this IO port is written to the Bochs console
// (e.g. the console where Qemu is running).
static constexpr u16 BOCHS_DEBUG_PORT = 0xE9;
inline u8 in8(u16 port)
{
u8 value;
asm volatile("inb %1, %0"
: "=a"(value)
: "Nd"(port));
return value;
}
inline u16 in16(u16 port)
{
u16 value;
asm volatile("inw %1, %0"
: "=a"(value)
: "Nd"(port));
return value;
}
inline u32 in32(u16 port)
{
u32 value;
asm volatile("inl %1, %0"
: "=a"(value)
: "Nd"(port));
return value;
}
inline void out8(u16 port, u8 value)
{
asm volatile("outb %0, %1" ::"a"(value), "Nd"(port));
}
inline void out16(u16 port, u16 value)
{
asm volatile("outw %0, %1" ::"a"(value), "Nd"(port));
}
inline void out32(u16 port, u32 value)
{
asm volatile("outl %0, %1" ::"a"(value), "Nd"(port));
}
inline void delay(size_t microseconds)
{
for (size_t i = 0; i < microseconds; ++i)
IO::in8(0x80);
}
}
class IOAddress {
public:
IOAddress() = default;
explicit IOAddress(u16 address)
: m_address(address)
{
}
IOAddress offset(u16 o) const { return IOAddress(m_address + o); }
u16 get() const { return m_address; }
void set(u16 address) { m_address = address; }
void mask(u16 m) { m_address &= m; }
template<typename T>
ALWAYS_INLINE T in()
{
static_assert(sizeof(T) <= 4);
if constexpr (sizeof(T) == 4)
return IO::in32(get());
if constexpr (sizeof(T) == 2)
return IO::in16(get());
if constexpr (sizeof(T) == 1)
return IO::in8(get());
VERIFY_NOT_REACHED();
}
template<typename T>
ALWAYS_INLINE void out(T value) const
{
static_assert(sizeof(T) <= 4);
if constexpr (sizeof(T) == 4) {
IO::out32(get(), value);
return;
}
if constexpr (sizeof(T) == 2) {
IO::out16(get(), value);
return;
}
if constexpr (sizeof(T) == 1) {
IO::out8(get(), value);
return;
}
VERIFY_NOT_REACHED();
}
inline void out(u32 value, u8 bit_width) const
{
if (bit_width == 32) {
IO::out32(get(), value);
return;
}
if (bit_width == 16) {
IO::out16(get(), value);
return;
}
if (bit_width == 8) {
IO::out8(get(), value);
return;
}
VERIFY_NOT_REACHED();
}
bool is_null() const { return m_address == 0; }
bool operator==(IOAddress const& other) const { return m_address == other.m_address; }
bool operator!=(IOAddress const& other) const { return m_address != other.m_address; }
bool operator>(IOAddress const& other) const { return m_address > other.m_address; }
bool operator>=(IOAddress const& other) const { return m_address >= other.m_address; }
bool operator<(IOAddress const& other) const { return m_address < other.m_address; }
bool operator<=(IOAddress const& other) const { return m_address <= other.m_address; }
private:
u16 m_address { 0 };
};
template<>
struct AK::Formatter<IOAddress> : AK::Formatter<FormatString> {
ErrorOr<void> format(FormatBuilder& builder, IOAddress value)
{
return Formatter<FormatString>::format(builder, "IO {:x}", value.get());
}
};
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