?? io.h
字號:
//// 硬件端口字節輸出函數。// 參數：value - 欲輸出字節；port - 端口。#define outb(value,port) \__asm__ ( "outb %%al,%%dx":: "a" (value), "d" (port))//// 硬件端口字節輸入函數。// 參數：port - 端口。返回讀取的字節。#define inb(port) ({ \unsigned char _v; \__asm__ volatile ( "inb %%dx,%%al": "=a" (_v): "d" (port)); \_v; \})//// 帶延遲的硬件端口字節輸出函數。// 參數：value - 欲輸出字節；port - 端口。#define outb_p(value,port) \__asm__ ( "outb %%al,%%dx\n" \"\tjmp 1f\n" \"1:\tjmp 1f\n" \"1:":: "a" (value), "d" (port))//// 帶延遲的硬件端口字節輸入函數。// 參數：port - 端口。返回讀取的字節。#define inb_p(port) ({ \unsigned char _v; \__asm__ volatile ( "inb %%dx,%%al\n" \"\tjmp 1f\n" \"1:\tjmp 1f\n" \"1:": "=a" (_v): "d" (port)); \_v; \})?? 快捷鍵說明
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