mm: add get_page_dir & set_page_dir

2025-05-31 18:09:56 +03:00
parent d5f41b1ef9
commit 33aa97c6ec
2 changed files with 13 additions and 0 deletions
@@ -39,6 +39,8 @@ extern uint32_t *kpage_dir;

 //paging.c
 void grub_memory_map(unsigned int magic, struct multiboot_info* mbi);
+uint32_t* get_page_dir();
+void set_page_dir(uint32_t new_page_dir);
 void enablePaging();
 void loadPageDirectory(uint32_t* page_directory);

@@ -112,6 +112,17 @@ void grub_memory_map(unsigned int magic, struct multiboot_info* mbi)
    }
 }

+uint32_t* get_page_dir()
+{
+    uint32_t cr3_value;
+    asm volatile("mov %%cr3, %0" : "=r" (cr3_value));
+    return (uint32_t*) cr3_value;
+}
+
+void set_page_dir(uint32_t new_page_dir) {
+    asm volatile("mov %0, %%cr3" : : "r" (new_page_dir));
+}
+
 void enablePaging() {
    asm volatile (
        "mov %%cr0, %%eax\n"