Massive backlog of changes

include/platform/paging.h

@@ -0,0 +1,96 @@
+#pragma once
+
+#include "types/physaddr.h"
+#include <stddef.h>
+
+enum page_flag_t
+{
+    PAGE_RW = 1,
+    PAGE_EXECUTABLE = 1 << 1,
+    PAGE_USERMODE = 1 << 2,
+    PAGE_PRESENT = 1 << 16,
+    PAGE_ANON = 1 << 17,
+    PAGE_COPY_ON_WRITE = 1 << 18
+};
+
+const size_t page_table_levels;
+
+/**
+ * @brief 
+ * 
+ * @param table 
+ * @return int 
+ */
+int paging_init_top_table(physaddr_t table);
+
+/**
+ * @brief Returns the physical address of the top-level page table currently in
+ * use.
+ * 
+ * @return physaddr_t 
+ */
+physaddr_t paging_current_address_space();
+
+/**
+ * @brief Load an existing top-level page table
+ * 
+ * @param table 
+ */
+void paging_load_address_space(physaddr_t table);
+
+/**
+ * @brief Get the pte type object
+ * 
+ * @param page 
+ * @param level 
+ * @return int 
+ */
+int get_pte_type(void *page, int level);
+
+/**
+ * @brief Set the pte type object
+ * 
+ * @param page 
+ * @param level 
+ * @param flags 
+ * @return int 
+ */
+int set_pte_type(void *page, int level, int flags);
+
+/**
+ * @brief Get the pte address object
+ * 
+ * @param page 
+ * @param level 
+ * @return physaddr_t 
+ */
+physaddr_t get_pte_address(void *page, int level);
+
+/**
+ * @brief Set the pte address object
+ * 
+ * @param page 
+ * @param level 
+ * @param addr 
+ * @return int 
+ */
+int set_pte_address(void *page, int level, physaddr_t addr);
+
+/**
+ * @brief Set the pte object
+ * 
+ * @param page 
+ * @param level 
+ * @param flags 
+ * @param addr 
+ * @return int 
+ */
+int set_pte(void *page, int level, int flags, physaddr_t addr);
+
+/**
+ * @brief Resets all entries in the same table as the specified entry
+ * 
+ * @param page 
+ * @param level 
+ */
+void wipe_page_table(void *page, int level);