add more comments in toy.S
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@ -26,5 +26,5 @@ dispstr:
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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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.org 0x1fe, 0x90
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.word 0xaa55
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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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