FORKgit add .git add .!

kernel/memory/mm.h

@@ -3,12 +3,24 @@
 
 #include <stdint.h>
 
-#define PAGE_PRESENT  0x1
-#define PAGE_WRITABLE 0x2
-#define PAGE_USER     0x4
+#define PAGE_PRESENT  (1 << 0)
+#define PAGE_WRITABLE (1 << 1)
+#define PAGE_USER     (1 << 2)
+#define PAGE_COW      (1 << 9)
+
+#define TEMP_KERNPD_VADDR   0xDFF90000
+#define TEMP_TASKPD_VADDR   0xDFFA0000
+#define TEMP_PT_SRC         0xDFFB0000
+#define TEMP_PT_DST         0xDFFC0000
 
 #define PAGE_SIZE 4096
 
+#define MAX_RAM   0xFFFFFFFF // 4GB
+#define BITMAP_SIZE ((MAX_RAM / PAGE_SIZE) / 8)
+
+#define CUR_PAGE_DIRECTORY  0xFFFFF000
+#define CUR_PAGE_TABLES  0xFFC00000
+
 typedef struct __attribute__((packed)) {
     uint32_t addr;
 } mem_page_t;
@@ -20,10 +32,13 @@ void* p_alloc_frame();
 
 uint32_t total_free_memory();
 
-void* create_task_pd();
-void* clone_task_pd();
+void* create_new_pd();
+void* clone_current_pd();
+
+int is_cow(uint32_t vaddr);
 
 void map_page(uint32_t vaddr, uint32_t paddr, uint32_t flags);
+void unmap_page(uint32_t vaddr);
 
 void load_pd(void* paddr);