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io.h：源码内容

							/*
 * linux/include/asm-arm/arch-sa1100/io.h
 *
 * Copyright (C) 1997-1999 Russell King
 *
 * Modifications:
 *  06-12-1997	RMK	Created.
 *  07-04-1999	RMK	Major cleanup
 */
#ifndef __ASM_ARM_ARCH_IO_H
#define __ASM_ARM_ARCH_IO_H
#define IO_SPACE_LIMIT 0xffffffff
/*
 * We don't actually have real ISA nor PCI buses, but there is so many 
 * drivers out there that might just work if we fake them...
 */
#define __io(a)			(PCIO_BASE + (a))
#define __mem_pci(a)		((unsigned long)(a))
#define __mem_isa(a)		((unsigned long)(a))
/*
 * Generic virtual read/write
 */
#define __arch_getw(a)		(*(volatile unsigned short *)(a))
#define __arch_putw(v,a)	(*(volatile unsigned short *)(a) = (v))
#define iomem_valid_addr(iomem,sz)	(1)
#define iomem_to_phys(iomem)		(iomem)
#endif

						