load my own fking GDT woop

kernel/src/arch/x86_64/entry-stivale2.c

@@ -42,6 +42,8 @@ void stivale2_main(struct stivale2_struct *info) {
     );
     printf("PAGE TABLE AT: %x\n", cr3);
 
+    loadgdt();
+
     struct gdt_ptr pGDT;
     __asm__ __volatile__("sgdt %0" : : "m"(pGDT) : "memory");
     printf("GDT: %x (%d)\n", pGDT.base, pGDT.limit);

kernel/src/arch/x86_64/gdt.nasm

@@ -1,10 +1,15 @@
 section .rodata
+align 8
 gdt64:
     dq 0
-.code: equ $-gdt64
+.codesys: equ $-gdt64
     dq (1<<44) | (1<<47) | (1<<41) | (1<<43) | (1<<53)
-.data: equ $ - gdt64
+.datasys: equ $-gdt64
     dq (1<<44) | (1<<47) | (1<<41)
+.codeusr: equ $-gdt64
+    dq (1<<44) | (1<<47) | (1<<41) | (1<<43) | (1<<53) | (3<<45)
+.datausr: equ $-gdt64
+    dq (1<<44) | (1<<47) | (1<<41) | (3<<45)
 .pointer:
     dw .pointer - gdt64 - 1
     dq gdt64
@@ -13,4 +18,18 @@ section .text
 global loadgdt
 loadgdt:
     lgdt [gdt64.pointer]
-    
+    ; now what I tried unsuccessfully:
+
+    mov rax, gdt64.codesys;
+    push rax
+    mov rax, loadgdtdone
+    push rax   ; function to execute next
+    retfq               ; far return (pops address and code segment)
+loadgdtdone:
+    mov ax, gdt64.datasys
+    mov ss, ax
+    mov ds, ax
+    mov es, ax
+    mov fs, ax
+    mov gs, ax
+    ret