53 lines
890 B
NASM
53 lines
890 B
NASM
SECTION .text
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USE16
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stage2.entry:
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mov si, stage_msg
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call print
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mov al, '3'
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call print_char
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call print_line
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; check for required features
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call cpuid_check
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; enable A20-Line via IO-Port 92, might not work on all motherboards
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in al, 0x92
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or al, 2
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out 0x92, al
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mov dword [protected_mode.func], stage3.entry
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jmp protected_mode.entry
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%include "cpuid.asm"
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%include "gdt.asm"
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%include "protected_mode.asm"
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%include "thunk.asm"
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USE32
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stage3.entry:
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; stage3 stack at 448 KiB (512KiB minus 64KiB disk buffer)
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mov esp, 0x70000
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; push arguments
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mov eax, thunk.int16
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push eax
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mov eax, thunk.int15
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push eax
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mov eax, thunk.int13
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push eax
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mov eax, thunk.int10
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push eax
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xor eax, eax
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mov al, [disk]
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push eax
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mov eax, [stage3 + 0x18]
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call eax
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.halt:
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cli
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hlt
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jmp .halt
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