Completed kheap and added some parts of paging.h

kernel/drivers/paging.h

@@ -0,0 +1,37 @@
+#ifndef PAGING_H
+#define PAGING_G
+
+#include <stdint.h>
+#include "isr.h"
+#include "kheap.h"
+
+typedef struct page {
+    uint32_t present : 1; // Presence in memory of single page
+    uint32_t fw : 1; // if set read write otherwise read only
+    uint32_t user : 1;  // Supervisored mode only if cleared
+    uint32_t accessed : 1; // true if page has been accessed since last refresh
+    uint32_t dirty : 1; // Same as above for write.
+    uint32_t unused : 7; // unused bits
+    uint32_t frame : 20; // Frame address (shifted to the right)
+} page_t;
+
+typedef struct page_table {
+    page_t pages[1024];
+} page_table_t;
+
+typedef struct page_directory {
+    page_table_t *tables[1024]; // array of pointers to page tables
+    uint32_t tables_physical[1024]; // address of tables physical. 
+    uint32_t physical_addr;
+} page_directory_t;
+
+// Setup the environment
+void init_paging();
+// Load specified page directory into CR3 register
+void switch_page_directory(page_directory_t *new);
+// Retrieve pointer to specified page address
+page_t *get_page(uint32_t addr, int32_t make, page_directory_t *dir);
+// Handle page faults
+void page_fault(registers_t regs);
+
+#endif