From 86cb117509903b74c34697b079180cc1ad74f6db Mon Sep 17 00:00:00 2001
From: Ruslan Isaev <ubijca16@gmail.com>
Date: Sun, 6 Apr 2025 17:13:48 +0300
Subject: [PATCH] gdt: add ring3 code and data segments

---
 src/gdt.asm | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/gdt.asm b/src/gdt.asm
index e2ffbb9..fea63ae 100644
--- a/src/gdt.asm
+++ b/src/gdt.asm
@@ -19,6 +19,22 @@ gdt_data:
   db 11001111b ; 48-55 limit (48-51) and flags (52-55)
   db 0         ; 56-63 base
 
+gdt_code_ring3:
+  dw 0xffff
+  dw 0
+  db 0
+  db 11111010b
+  db 11001111b
+  db 0
+
+gdt_data_ring3:
+  dw 0xffff
+  dw 0
+  db 0
+  db 11110010b
+  db 11001111b
+  db 0
+
 gdt_end:
 
 
@@ -28,3 +44,5 @@ gdt:
 
 CODE_SEG equ gdt_code - gdt_start
 DATA_SEG equ gdt_data - gdt_start
+CODE_SEG_RING3 equ gdt_code_ring3 - gdt_start  ; 24
+DATA_SEG_RING3 equ gdt_data_ring3 - gdt_start  ; 32