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