2019-04-20 23:02:35 +02:00
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cpu 8086
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org 0x0000
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db 0x55, 0xAA, 0x00
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jmp optrom_init
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times (0x1A - ($-$$)) db 0
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dw pnp
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align 16
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pnp:
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db "$PnP"
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db 1 ; version 1
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db 2 ; 2 * 16 length
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dw 0 ; offset of next header
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db 0
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db 0 ; checksum (filled by fix-rom)
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dd 0 ; device identifier
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dw .vendor ; manufacturer string
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dw .product ; product name string
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db 0,0,0 ; device type string
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db 0x20 ; device indicator, bit for "read cacheable" set
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dw 0 ; boot connection vector
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dw 0 ; boot disconnect vector
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dw start ; bootstrap entry point
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dw 0 ; reserved
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dw 0
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.vendor:
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db "Nero", 0
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.product:
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db "2B", 0
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align 16
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optrom_init:
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push di
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push es
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xor ax, ax
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mov es, ax
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mov di, 0x0060 ; vector (0x18 * 4 bytes)
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mov ax, start
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stosw
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mov ax, cs
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stosw
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pop es
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pop di
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retf
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start:
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call intr_init
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sti
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mov si, 0x0000
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mov ds, si
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.loop:
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push bx
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mov dx, 0x0000
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mov ah, 0x02
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mov bx, 0x0000
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int 0x10
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pop bx
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call dump
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mov ah, 0x01
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int 0x21
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cmp al, 0x30
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jne .notup
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sub bx, 0x0100
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.notup:
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cmp al, 0x31
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jne .notdown
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add bx, 0x0100
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.notdown:
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jmp .loop
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.halt:
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hlt
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jmp .halt
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dump:
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mov si, bx
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mov cx, 0x10
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.nextline:
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mov ax, si
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call kprint16
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mov al, 0x3A
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call kputc
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mov al, 0x20
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call kputc
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push cx
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mov cx, 0x0020
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.bytes:
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lodsb
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call kprint8
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loop .bytes
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pop cx
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mov al,0x20
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call kputc
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mov al,0x0A
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call kputc
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mov al,0x0D
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call kputc
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loop .nextline
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ret
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%include "intr.asm"
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%include "debug.asm"
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%include "kprintf.asm"
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%include "dosapi.asm"
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_reloc_end:
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align 512
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