gdt: make gdt setup run before kmain

2025-03-18 15:45:51 +03:00
parent a899964fce
commit 086bac07ed
3 changed files with 47 additions and 1 deletions
@@ -0,0 +1,30 @@
+gdt_start:
+  ; null entry
+  dd 0
+  dd 0
+
+gdt_code:
+  dw 0xffff    ; 00-15 limit
+  dw 0         ; 16-31 base
+  db 0         ; 32-39 base
+  db 10011010b ; 40-47 access
+  db 11001111b ; 48-55 limit (48-51) and flags (52-55)
+  db 0         ; 56-63 base
+
+gdt_data:
+  dw 0xffff    ; 00-15 limit
+  dw 0         ; 16-31 base
+  db 0         ; 32-39 base
+  db 10010010b ; 40-47 access
+  db 11001111b ; 48-55 limit (48-51) and flags (52-55)
+  db 0         ; 56-63 base
+
+gdt_end:
+
+
+gdt:
+  dw gdt_end - gdt_start - 1 ; length
+  dd gdt_start               ; address
+
+CODE_SEG equ gdt_code - gdt_start
+DATA_SEG equ gdt_data - gdt_start