diff options
Diffstat (limited to 'src/loader/ent.asm')
| -rw-r--r-- | src/loader/ent.asm | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/loader/ent.asm b/src/loader/ent.asm new file mode 100644 index 0000000..47cf49b --- /dev/null +++ b/src/loader/ent.asm @@ -0,0 +1,33 @@ +; MIT License, Copyright (c) 2021 Marvin Borner + +extern bss_begin +extern bss_end +extern start +extern gdt + +section .entry + +global _start +_start: + cld + + ; Clear bss section + xor al, al + mov edi, bss_begin + mov ecx, bss_end + sub ecx, bss_begin + rep stosb + + lgdt [gdt] + jmp 0x18:.reload_cs + +.reload_cs: + mov eax, 0x20 + mov ds, ax + mov es, ax + mov fs, ax + mov gs, ax + mov ss, ax + + cli + jmp start |