1 files changed, 37 insertions, 1 deletions
diff --git a/kernel/vmem.h b/kernel/vmem.h
index 5d35a30..7c7ffd0 100644
--- a/kernel/vmem.h
+++ b/kernel/vmem.h
@@ -1 +1,37 @@
-void vmem_init();
+//! i86 architecture defines 1024 entries per table--do not change
+#define PAGES_PER_TABLE 1024
+#define PAGES_PER_DIR	1024
+
+#define PAGE_DIRECTORY_INDEX(x) (((x) >> 22) & 0x3ff)
+#define PAGE_TABLE_INDEX(x) (((x) >> 12) & 0x3ff)
+#define PAGE_GET_PHYSICAL_ADDRESS(x) (*x & ~0xfff)
+
+//! page table represents 4mb address space
+#define PTABLE_ADDR_SPACE_SIZE 0x400000
+
+//! directory table represents 4gb address space
+#define DTABLE_ADDR_SPACE_SIZE 0x100000000
+
+//! page sizes are 4k
+#define PAGE_SIZE 4096
+ 
+//! page table entry
+typedef uint32_t pt_entry;
+
+//! a page directery entry
+typedef uint32_t pd_entry;
+
+
+//! page table
+typedef struct ptable_struct {
+ 
+    pt_entry m_entries[PAGES_PER_TABLE];
+}ptable ;
+ 
+//! page directory
+typedef struct pdirectory_struct {
+ 
+    pd_entry m_entries[PAGES_PER_DIR];
+}pdirectory;
+
+pdirectory* vmem_init();