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Do a far jump to long mode and print OKAY

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Philipp Oppermann
2017-04-11 14:59:09 +02:00
parent e684bfd262
commit 415d27814f
2 changed files with 13 additions and 0 deletions
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4
src/arch/x86_64/boot.asm
View File

@@ -1,4 +1,5 @@
global start global start
extern long_mode_start
section .text section .text
bits 32 bits 32
@@ -15,6 +16,8 @@ start:
; load the 64-bit GDT ; load the 64-bit GDT
lgdt [gdt64.pointer] lgdt [gdt64.pointer]
jmp gdt64.code:long_mode_start
; print `OK` to screen ; print `OK` to screen
mov dword [0xb8000], 0x2f4b2f4f mov dword [0xb8000], 0x2f4b2f4f
hlt hlt
@@ -154,6 +157,7 @@ stack_top:
section .rodata section .rodata
gdt64: gdt64:
dq 0 ; zero entry dq 0 ; zero entry
.code: equ $ - gdt64 ; new
dq (1<<43) | (1<<44) | (1<<47) | (1<<53) ; code segment dq (1<<43) | (1<<44) | (1<<47) | (1<<53) ; code segment
.pointer: .pointer:
dw $ - gdt64 - 1 dw $ - gdt64 - 1

9
src/arch/x86_64/long_mode_init.asm Normal file
View File

@@ -0,0 +1,9 @@
global long_mode_start
section .text
bits 64
long_mode_start:
; print `OKAY` to screen
mov rax, 0x2f592f412f4b2f4f
mov qword [0xb8000], rax
hlt