//// 硬件端口字節(jié)輸出函數(shù)。// 參數(shù)：value - 欲輸出字節(jié)；port - 端口。#define outb(value,port) \__asm__ ( "outb %%al,%%dx":: "a" (value), "d" (port))//// 硬件端口字節(jié)輸入函數(shù)。// 參數(shù)：port - 端口。返回讀取的字節(jié)。#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(jié)輸出函數(shù)。// 參數(shù)：value - 欲輸出字節(jié)；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(jié)輸入函數(shù)。// 參數(shù)：port - 端口。返回讀取的字節(jié)。#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; \})