Jeremy Soller
95 lines
1.5 KiB
NASM
95 lines
1.5 KiB
NASM
SECTION .text
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USE16
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stage2.entry:
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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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; load memory map
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;TODO: rewrite this in Rust
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call memory_map
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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 "long_mode.asm"
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%include "memory_map.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 256 KiB
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mov esp, 0x40000
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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, kernel.entry
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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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kernel:
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.stack: dq 0
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.func: dq 0
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.args: dq 0
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.entry:
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; page_table: usize
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mov eax, [esp + 4]
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mov [long_mode.page_table], eax
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; stack: u64
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mov eax, [esp + 8]
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mov [.stack], eax
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mov eax, [esp + 12]
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mov [.stack + 4], eax
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; func: u64
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mov eax, [esp + 16]
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mov [.func], eax
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mov eax, [esp + 20]
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mov [.func + 4], eax
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; args: *const KernelArgs
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mov eax, [esp + 24]
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mov [.args], eax
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mov eax, .inner
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mov [long_mode.func], eax
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jmp long_mode.entry
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USE64
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.inner:
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mov rsp, [.stack]
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mov rax, [.func]
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mov rdi, [.args]
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call rax
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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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