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#define SHUTDOWN_PORT 0x8900
.text
.globl _start
_start:
base:
.code16
jmp cont
portmsg:
xorw %ax, %ax
1:
movb 0(%si), %al
test %ax, %ax
jz 1f
outb %al, %dx
incw %si
jmp 1b
1:
ret
serialmsg:
1:
movb 0(%si), %bl
testb %bl, %bl
jz 1f
movw $0x3fd, %dx
2:
inb %dx, %al
testb $0x20, %al
jz 2b
movw $0x3f8, %dx
movb %bl, %al
outb %al, %dx
incw %si
jmp 1b
1:
ret
cont:
#ifdef TARGET_NTLDR
movw $0x2000, %ax
#elif defined (TARGET_CHAINLOADER)
xorw %ax, %ax
#else
#error unsupported target
#endif
movw %ax, %ds
lea message, %si
call serialmsg
lea shutdown, %si
movw $SHUTDOWN_PORT, %dx
call portmsg
1:
hlt
jmp 1b
shutdown:
.ascii "Shutdown"
.byte 0
message:
.ascii "Boot Test Passed Successfully\n" SUCCESSFUL_BOOT_STRING "\n"
.byte 0
. = base + 510
.short 0xaa55
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