Fixed and optimized VMM

src/kernel/mm/pde.c

@@ -9,12 +9,11 @@ void pd_entry_del_attr(pd_entry_t *entry, uint32_t attr){
 }
 
 void pd_entry_set_frame(pd_entry_t *entry, phys_addr frame){
-    *entry &= ~PDE_FRAME;
-    *entry |= frame << 12;
+    *entry = (*entry & ~PDE_FRAME) | frame;
 }
 
 phys_addr pd_entry_get_frame(pd_entry_t entry){
-    return entry >> 12;
+    return entry & PDE_FRAME;
 }
 
 bool pd_entry_is_present(pd_entry_t entry){

src/kernel/mm/pte.c

@@ -9,12 +9,11 @@ void pt_entry_del_attr(pt_entry_t *entry, uint32_t attr){
 }
 
 void pt_entry_set_frame(pt_entry_t *entry, phys_addr frame){
-    *entry &= ~PTE_FRAME;
-    *entry |= frame << 12;
+    *entry = (*entry & ~PTE_FRAME) | frame;
 }
 
 phys_addr pt_entry_get_frame(pt_entry_t entry){
-    return entry >> 12;
+    return entry & PTE_FRAME;
 }
 
 bool pt_entry_is_present(pt_entry_t entry){

src/kernel/mm/vmm.c

@@ -92,7 +92,7 @@ void vmm_initialize(){
     // Clear default table
     memset(table, 0, sizeof(vmm_page_table_t));
 
-    // First 1MB are identity mapped
+    // First 4MB are identity mapped
     for(int i = 0, frame = 0x0, virt = 0x00000000; i<1024; i++, frame += 4096, virt += 4096){
         // Create a new page
         pt_entry_t page = 0;