CTAOS v4

SysCore/memory/lib/pde.c

@@ -0,0 +1,36 @@
+#include "pde.h"
+
+void pd_entry_add_attrib (pd_entry* entry, unsigned mask) {
+      *entry |= mask;
+}
+
+void pd_entry_del_attrib (pd_entry* entry, unsigned mask) {
+      *entry &= ~mask;
+}
+
+void pd_entry_set_frame (pd_entry* entry, unsigned address) {
+      *entry = (*entry & ~_I86_PDE_FRAME) | address;
+}
+ 
+unsigned pd_entry_get_frame (pd_entry entry) {
+      return entry&_I86_PDE_FRAME;
+}
+
+unsigned char pd_entry_is_present (pd_entry entry) {
+      return (entry & _I86_PDE_PRESENT);
+}
+
+unsigned char pd_entry_is_user (pd_entry entry) {
+      return (entry & _I86_PDE_USER);
+}
+ 
+unsigned char pd_entry_is_4mb (pd_entry entry) {
+      return (entry & _I86_PDE_4MB);
+}
+ 
+unsigned char pd_entry_is_writable (pd_entry entry) {
+      return (entry & _I86_PDE_WRITABLE);
+}
+
+void pd_entry_enable_global (pd_entry entry) {
+}