io.h

这是TFTP 协议的最新源代码 很辛苦的

#ifndef _IO_H_
#define _IO_H_

/*
 * readX/writeX() are used to access memory mapped io devices. 
 * On the m68k architecture, we just read/write the memory location directly.
 */

#define readb(addr) (*(volatile unsigned char *) (addr))
#define readw(addr) (*(volatile unsigned short *) (addr))
#define readl(addr) (*(volatile unsigned int *) (addr))

#define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b))
#define writew(w,addr) (void)((*(volatile unsigned short *) (addr)) = (w))
#define writel(l,addr) (void)((*(volatile unsigned int *) (addr)) = (l))

#define orb(b,addr) (void)((*(volatile unsigned char *) (addr)) |= (b))
#define orw(w,addr) (void)((*(volatile unsigned short *) (addr)) |= (w))
#define orl(l,addr) (void)((*(volatile unsigned int *) (addr)) |= (l))

#define andb(b,addr) (void)((*(volatile unsigned char *) (addr)) &= (b))
#define andw(w,addr) (void)((*(volatile unsigned short *) (addr)) &= (w))
#define andl(l,addr) (void)((*(volatile unsigned int *) (addr)) &= (l))

#define setb(b,addr) orb((b),(addr))
#define setw(w,addr) orw((w),(addr))
#define setl(l,addr) orl((l),(addr))

#define clrb(b,addr) andb(~(b),(addr))
#define clrw(w,addr) andw(~(w),(addr))
#define clrl(l,addr) andl(~(l),(addr))

#define bit(b) (1<<(b))

#endif /* _IO_H_ */