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Create and load a 64-bit GDT

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Philipp Oppermann
2017-04-11 14:56:58 +02:00
parent 936e2073a9
commit e684bfd262
1 changed files with 11 additions and 0 deletions
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11
src/arch/x86_64/boot.asm
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@@ -12,6 +12,9 @@ start:
call set_up_page_tables call set_up_page_tables
call enable_paging call enable_paging
; load the 64-bit GDT
lgdt [gdt64.pointer]
; print `OK` to screen ; print `OK` to screen
mov dword [0xb8000], 0x2f4b2f4f mov dword [0xb8000], 0x2f4b2f4f
hlt hlt
@@ -147,3 +150,11 @@ p2_table:
stack_bottom: stack_bottom:
resb 64 resb 64
stack_top: stack_top:
section .rodata
gdt64:
dq 0 ; zero entry
dq (1<<43) | (1<<44) | (1<<47) | (1<<53) ; code segment
.pointer:
dw $ - gdt64 - 1
dq gdt64