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| author | Marvin Borner | 2021-07-12 18:14:44 +0200 |
|---|---|---|
| committer | Marvin Borner | 2021-07-12 18:15:29 +0200 |
| commit | 1b429c0fc28e5cd8b474ad5a1de1fa6f3d7c2e2a (patch) | |
| tree | 593af3e3ec78795bb47553f492db07fb7e87e373 /src/loader/jumper.asm | |
| parent | d414d2f6f46bd425d727af5baae3e2658d6e1384 (diff) | |
Renamed files to match presentation
Diffstat (limited to 'src/loader/jumper.asm')
| -rw-r--r-- | src/loader/jumper.asm | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/loader/jumper.asm b/src/loader/jumper.asm new file mode 100644 index 0000000..f591dda --- /dev/null +++ b/src/loader/jumper.asm @@ -0,0 +1,28 @@ +; MIT License, Copyright (c) 2021 Marvin Borner +; Exit the bootloader and clear registers + +bits 32 + +; Empty (invalid) idt +idt: + dd 0, 0 + +global jmp_kernel +jmp_kernel: + cli ; Disable interrupts because of invalid idt + lidt [idt] ; Load empty (invalid) idt + + xor eax, eax + lldt ax ; Clear LDT by pointing to nothing + + add esp, 4 + pop edi + add esp, 4 + + mov eax, 0x00000001 + mov cr0, eax ; Clear cr0 except protected mode + + xor eax, eax + mov cr4, eax ; Clear cr4 completely + + call edi ; Call custom (specified) jumper |