लिनक्स/linux-0.01.tar/include/asm/io.h
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#define outb(value,port) \ __asm__ ("outb %%al,%%dx"::"a" (value),"d" (port)) #define inb(port) ({ \ unsigned char _v; \ __asm__ volatile ("inb %%dx,%%al":"=a" (_v):"d" (port)); \ _v; \ }) #define outb_p(value,port) \ __asm__ ("outb %%al,%%dx\n" \ "\tjmp 1f\n" \ "1:\tjmp 1f\n" \ "1:"::"a" (value),"d" (port)) #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; \ })