Started abstract memory manager class

src/memorymanager.hpp

@@ -0,0 +1,50 @@
+#ifndef MEMORYMANAGER_H
+#define MEMORYMANAGER_H
+
+#include "systypes.h"
+
+class MemoryManager
+{
+public:
+
+    /**
+     * Allocates space for a new top-level page table, and initializes it to
+     * point only to the kernel's page tables.
+     * 
+     * @returns the physical address of the new top-level page table
+     */
+    virtual physaddr_t createAddressSpace() = 0;
+
+    /**
+     * Loads the given top-level page table(s).
+     *
+     * @param table the top-level page table to load
+     */
+    virtual void loadAddressSpace(physaddr_t table) = 0;
+
+    /**
+     * Maps a single page to a single frame. Allocates a new page table if one
+     * does not exist for that frame.
+     * 
+     * @param page the virtual address of the page to map
+     * @param frame the physical address of the frame to map to
+     * @param flags flags to apply to the entry
+     * 
+     * @returns zero upon success, nonzero on failure
+     */
+    virtual int mapPage(void* page, physaddr_t frame, int flags) = 0;
+
+    /**
+     * Deletes the page table entry for the specified page. Does not deallocate
+     * redundant page tables or modify higher level tables; these are cleaned up
+     * after the owning process ends.
+     *
+     * @param page the virtual address of the page to unmap
+     *
+     * @returns zero upon success, nonzero on failure
+     */
+    virtual int unmapPage(void* page) = 0;
+
+};
+
+#endif