?? romcard.s
字號:
/* romcard.s - PC-386 ROM initialization module *//* Copyright 1984-1991 Wind River Systems, Inc. *//*modification history--------------------01a,27apr94,hdn written*//*DESCRIPTIONThis module contains the loader for codes programmed into a 27020 or 27040EPROM on Blunk Microsystems's RomCard 1.0. The entry point romcard, is thefirst code executed on power-up.This code is intended to be position independent and executed in 16bit 8086real mode.*/ .globl _romcard .text_romcard: .byte 0x31,0xc9 /* xor cx,cx */ .byte 0x8e,0xd1 /* mov ss,cx */ .byte 0xbc,0x00,0x70 /* mov sp,$7000 */ .byte 0xe8,0x00,0x00 /* call label1 */ /* label1: */ .byte 0x5b /* pop bx */ .byte 0x81,0xe3,0x00,0xff /* and bx,$ff00 */ .byte 0x2e,0x89,0x0f /* mov cs:[bx],cx */ .byte 0xb8,0x00,0x08 /* mov ax,$800 */ .byte 0x8e,0xd8 /* mov ds,ax */ .byte 0x1e /* push ds */ .byte 0xb8,0x00,0x00 /* mov ax,$0000 */ .byte 0x50 /* push ax */ /* label2: */ .byte 0x31,0xff /* xor di,di */ /* label3: */ .byte 0x2e,0x8b,0x81,0x00,0x02 /* mov ax,cs:[bx+di+$200] */ .byte 0x89,0x05 /* mov [di],ax */ .byte 0x47 /* inc di */ .byte 0x47 /* inc di */ .byte 0x81,0xff,0x00,0x02 /* cmp di,$200 */ .byte 0x75,0xf1 /* jne label3 */ .byte 0x41 /* inc cx */ .byte 0x2e,0x89,0x0f /* mov cs:[bx],cx */ .byte 0x8c,0xd8 /* mov ax,ds */ .byte 0x05,0x20,0x00 /* add ax,$20 */ .byte 0x8e,0xd8 /* mov ds, ax */ .byte 0x81,0xf9,0x00,0x04 /* cmp cx, 1024 */ .byte 0x75,0xde /* jne label2 */ .byte 0xcb /* retf */
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