bootstrap

用OpenWatcom编译通过

boot.asm:

DataSeg     EQU     07C0H
ExSeg       EQU     8000H
StackSeg    EQU     9000H

.8086
.MODEL SMALL

.CODE
ORG     0
JMP     Start

hello       DB      'Operating System Stating...', 13, 10, 0

Start:
MOV     AX, StackSeg
MOV     SS, AX
XOR     SP, SP

MOV     AX, ExSeg
MOV     ES, AX

MOV     AX, DataSeg
MOV     DS, AX

MOV     AX, OFFSET hello
PUSH    AX
CALL    _PrintStr
ADD     SP, 2

Hung:       NOP
JMP     Hung

_PrintStr   PROC    NEAR
PUSH    BP
MOV     BP, SP
MOV     AH, 0EH
MOV     BX, 0007H
MOV     SI, 04H[BP]
lp0_:       MOV     AL, [SI]
OR      AL, AL
JZ      end0_
INT     10H
INC     SI
JMP     lp0_
end0_:      POP     BP
RET
_PrintStr   ENDP

ORG     510
DW      0AA55H

END

makefile

ASM = wasm
CL = wcl

boot.bin: boot.asm
$(ASM) boot.asm
$(CL) boot.obj
exe2bin boot.exe boot.bin

clean:
del *.exe
del *.obj