2015-03-13 21:59:52 +08:00
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.text
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.globl start /* 程序从start处开始运行 */
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.code16
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start:
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jmpl $0x0, $code
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msg:
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.string "Hello world!"
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code:
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mov %cs,%ax
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mov %ax,%ds
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mov %ax,%es
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mov %ax,%ss
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mov $0x400,%sp
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call dispstr /* call dispstr函数显示字符串 */
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loop0: /* 无限循环 */
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jmp loop0
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dispstr:
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mov $msg ,%ax
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mov %ax ,%bp /* es:bp = 串地址 */
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mov $12 ,%cx /* cs = 串长度 */
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mov $0x1301 ,%ax /* ah=0x13：显示字符串 ,al=0x1：显示输出方式 */
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mov $0x000c ,%bx /* bh=0 ：第0页, bl=0xc ：高亮 黑底红字 */
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mov $0 ,%dl /* 在0行0列显示*/
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int $0x10 /* 调用BIOS提供的int服务0x10的0x13功能：显示字符串 */
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ret
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2015-03-13 22:08:13 +08:00
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.org 0x1fe, 0x90 /* 0x1fe=510，表示从ret后的位置开始，直到510处结束的代码/数据空间，填写0x90 */
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.word 0xaa55 /* 合法的主引导扇区标识 */
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