CHAP 8 Hardware Management. ANT [email protected] 鄭伊騏 (JOE). Outline. 8.1 I/O port and I/O Memory 8.2 Using I/O port 8.3 Using Digital I/O Ports 8.4 Using I/O Memory. I/O port and I/O Memory. Every peripheral device is controlled by writing and reading its registers.
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CHAP 8 Hardware Management
void barrier (void);宣告一個 memory barrier
void rmb (void); 保證在barrier前的read動作都完成
void wmb (void);保證在barrier前的write動作都完成
void mb (void);保證讀、寫兩種動作都會被落實執行
P.S memory barrier會影響效率,真正需要才使用