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