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Add and load a 64-bit GDT

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Philipp Oppermann
2015-08-13 13:20:15 +02:00
parent 457a61341a
commit 9c4b8fef9d
1 changed files with 14 additions and 0 deletions
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14
src/arch/x86_64/boot.asm
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@@ -26,6 +26,9 @@ start:
call setup_page_tables call setup_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
@@ -126,3 +129,14 @@ p3_table:
stack_bottom: stack_bottom:
resb 64 resb 64
stack_top: stack_top:
section .rodata
gdt64:
dq 0 ; zero entry
.code: equ $ - gdt64 ; new
dq (1<<44) | (1<<47) | (1<<41) | (1<<43) | (1<<53) ; code segment
.data: equ $ - gdt64 ; new
dq (1<<44) | (1<<47) | (1<<41) ; data segment
.pointer:
dw $ - gdt64 - 1
dq gdt64