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Data segment descriptors are not needed in 64-bit mode

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Philipp Oppermann
2016-12-28 16:22:02 +01:00
parent 0b03c18b06
commit 58e7cc77d0
1 changed files with 1 additions and 9 deletions
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10
src/arch/x86_64/boot.asm
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@@ -29,12 +29,6 @@ start:
; load the 64-bit GDT ; load the 64-bit GDT
lgdt [gdt64.pointer] lgdt [gdt64.pointer]
; update selectors
mov ax, gdt64.data
mov ss, ax
mov ds, ax
mov es, ax
jmp gdt64.code:long_mode_start jmp gdt64.code:long_mode_start
set_up_page_tables: set_up_page_tables:
@@ -202,9 +196,7 @@ section .rodata
gdt64: gdt64:
dq 0 ; zero entry dq 0 ; zero entry
.code: equ $ - gdt64 ; new .code: equ $ - gdt64 ; new
dq (1<<44) | (1<<47) | (1<<41) | (1<<43) | (1<<53) ; code segment dq (1<<44) | (1<<47) | (1<<43) | (1<<53) ; code segment
.data: equ $ - gdt64 ; new
dq (1<<44) | (1<<47) | (1<<41) ; data segment
.pointer: .pointer:
dw $ - gdt64 - 1 dw $ - gdt64 - 1
dq gdt64 dq gdt64