Kernel: Move x86 IO instructions code into the x86 specific folder

Kernel/Arch/x86/IO.h

@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Assertions.h>
+#include <AK/String.h>
+#include <AK/Types.h>
+
+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)
+    {
+        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)
+    {
+        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==(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 };
+};
+
+template<>
+struct AK::Formatter<IOAddress> : AK::Formatter<FormatString> {
+    void format(FormatBuilder& builder, IOAddress value)
+    {
+        return Formatter<FormatString>::format(builder, "IO {:x}", value.get());
+    }
+};