43 lines
701 B
NASM
43 lines
701 B
NASM
format PE DLL EFI at 10000000h
|
|
entry efimain
|
|
|
|
section '.text' code executable readable
|
|
|
|
include 'uefi.inc'
|
|
|
|
; ESP => return address
|
|
; ESP + 4 => Handle
|
|
; ESP + 8 => SysTable
|
|
efimain:
|
|
mov eax, [esp+4]
|
|
mov [handle], eax
|
|
mov eax, [esp+8]
|
|
mov [system_table], eax
|
|
|
|
mov ebx, [eax + EFI_SYSTEM_TABLE.ConOut]
|
|
|
|
mov eax, 1
|
|
push eax
|
|
push ebx
|
|
call [ebx + EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.Reset]
|
|
add esp, 8
|
|
|
|
push hello_msg
|
|
push ebx
|
|
call [ebx + EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.OutputString]
|
|
add esp, 8
|
|
|
|
jmp $
|
|
|
|
ret
|
|
|
|
|
|
section '.reloc' fixups data discardable
|
|
|
|
section '.data' data readable writeable
|
|
|
|
hello_msg du 'StupidOS EFI Bootloader', 13, 10, 0
|
|
|
|
handle dd ?
|
|
system_table dd ?
|