More paging stuff.

The test userspace process now runs at linear address 0x300000 which is
mapped to a dynamically allocated page from the MemoryManager. Cool!

1 files changed, 41 insertions, 0 deletions

diff --git a/Kernel/types.h b/Kernel/types.h
index 5c1f35d66d..8469e5cd6f 100644
--- a/Kernel/types.h
+++ b/Kernel/types.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <AK/Types.h>
+
 #define PACKED __attribute__ ((packed))
 #define NORETURN __attribute__ ((noreturn))
 #define PURE __attribute__ ((pure))
@@ -26,3 +28,42 @@ struct FarPtr {
     DWORD offset { 0 };
     WORD selector { 0 };
 } PACKED;
+
+class PhysicalAddress {
+public:
+    PhysicalAddress() { }
+    explicit PhysicalAddress(dword address) : m_address(address) { }
+
+    dword get() const { return m_address; }
+    void set(dword address) { m_address = address; }
+    void mask(dword m) { m_address &= m; }
+
+    byte* asPtr() { return reinterpret_cast<byte*>(m_address); }
+    const byte* asPtr() const { return reinterpret_cast<const byte*>(m_address); }
+
+    dword pageBase() const { return m_address & 0xfffff000; }
+
+private:
+    dword m_address { 0 };
+};
+
+class LinearAddress {
+public:
+    LinearAddress() { }
+    explicit LinearAddress(dword address) : m_address(address) { }
+
+    LinearAddress offset(dword o) const { return LinearAddress(m_address + o); }
+    dword get() const { return m_address; }
+    void set(dword address) { m_address = address; }
+    void mask(dword m) { m_address &= m; }
+
+    bool operator==(const LinearAddress& other) const { return m_address == other.m_address; }
+
+    byte* asPtr() { return reinterpret_cast<byte*>(m_address); }
+    const byte* asPtr() const { return reinterpret_cast<const byte*>(m_address); }
+
+    dword pageBase() const { return m_address & 0xfffff000; }
+
+private:
+    dword m_address { 0 };
+};