Functions for reading/writing some special registers

src/kernel/cpu/interrupts.tt

@@ -6,7 +6,7 @@
 #include "interrupts.c"
 
 uintptr_t isr_table[] ={};
-void load_idt(struct idtr *_)
+void load_idt(void *_)
 {
   (void)_;
 }

src/kernel/cpu/isr_common.S

@@ -1,10 +1,5 @@
 .intel_syntax noprefix
 
-.global load_idt
-load_idt:
-  lidt [rdi]
-  ret
-
 .extern int_handler
 .global isr_common
 .global isr_return

src/kernel/cpu/registers.S

@@ -0,0 +1,23 @@
+.intel_syntax noprefix
+
+.global load_idt
+load_idt:
+  lidt [rdi]
+  ret
+
+.global read_cr0
+read_cr0:
+  mov rax, cr0
+  ret
+.global read_cr2
+read_cr2:
+  mov rax, cr2
+  ret
+.global read_cr3
+read_cr3:
+  mov rax, cr3
+  ret
+.global read_cr4
+read_cr4:
+  mov rax, cr4
+  ret