text: #ifndef _ASM_CRIS_IO_H
  #define _ASM_CRIS_IO_H
  
  #include <asm/page.h>   /* for __va, __pa */
  #include <asm/arch/io.h>
  #include <linux/kernel.h>
  
  struct cris_io_operations
  {
  	u32 (*read_mem)(void *addr, int size);
  	void (*write_mem)(u32 val, int size, void *addr);
  	u32 (*read_io)(u32 port, void *addr, int size, int count);
  	void (*write_io)(u32 port, void *addr, int size, int count);
  };
  
  #ifdef CONFIG_PCI
  extern struct cris_io_operations *cris_iops;
  #else
  #define cris_iops ((struct cris_io_operations*)NULL)
  #endif
  
  /*
   * Change virtual addresses to physical addresses and vv.
   */
  
  static inline unsigned long virt_to_phys(volatile void * address)
  {
  	return __pa(address);
  }
  
  static inline void * phys_to_virt(unsigned long address)
  {
  	return __va(address);
  }
  
  extern void __iomem * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
  extern void __iomem * __ioremap_prot(unsigned long phys_addr, unsigned long size, pgprot_t prot);
  
  static inline void __iomem * ioremap (unsigned long offset, unsigned long size)
  {
  	return __ioremap(offset, size, 0);
  }
  
  extern void iounmap(volatile void * __iomem addr);
  
  extern void __iomem * ioremap_nocache(unsigned long offset, unsigned long size);
  
  /*
   * IO bus memory addresses are also 1:1 with the physical address
   */
  #define virt_to_bus virt_to_phys
  #define bus_to_virt phys_to_virt
  
  /*
   * readX/writeX() are used to access memory mapped devices. On some
   * architectures the memory mapped IO stuff needs to be accessed
   * differently. On the CRIS architecture, we just read/write the
   * memory location directly.
   */
  #ifdef CONFIG_PCI
  #define PCI_SPACE(x) ((((unsigned)(x)) & 0x10000000) == 0x10000000)
  #else
  #define PCI_SPACE(x) 0
  #endif
  static inline unsigned char readb(const volatile void __iomem *addr)
  {
  	if (PCI_SPACE(addr) && cris_iops)
  		return cris_iops->read_mem((void*)addr, 1);
  	else
  		return *(volatile unsigned char __force *) addr;
  }
  static inline unsigned short readw(const volatile void __iomem *addr)
  {
  	if (PCI_SPACE(addr) && cris_iops)
  		return cris_iops->read_mem((void*)addr, 2);
  	else
  		return *(volatile unsigned short __force *) addr;
  }
  static inline unsigned int readl(const volatile void __iomem *addr)
  {
  	if (PCI_SPACE(addr) && cris_iops)
  		return cris_iops->read_mem((void*)addr, 4);
  	else
  		return *(volatile unsigned int __force *) addr;
  }
  #define readb_relaxed(addr) readb(addr)
  #define readw_relaxed(addr) readw(addr)
  #define readl_relaxed(addr) readl(addr)
  #define __raw_readb readb
  #define __raw_readw readw
  #define __raw_readl readl
  
  static inline void writeb(unsigned char b, volatile void __iomem *addr)
  {
  	if (PCI_SPACE(addr) && cris_iops)
  		cris_iops->write_mem(b, 1, (void*)addr);
  	else
  		*(volatile unsigned char __force *) addr = b;
  }
  static inline void writew(unsigned short b, volatile void __iomem *addr)
  {
  	if (PCI_SPACE(addr) && cris_iops)
  		cris_iops->write_mem(b, 2, (void*)addr);
  	else
  		*(volatile unsigned short __force *) addr = b;
  }
  static inline void writel(unsigned int b, volatile void __iomem *addr)
  {
  	if (PCI_SPACE(addr) && cris_iops)
  		cris_iops->write_mem(b, 4, (void*)addr);
  	else
  		*(volatile unsigned int __force *) addr = b;
  }
  #define __raw_writeb writeb
  #define __raw_writew writew
  #define __raw_writel writel
  
  #define mmiowb()
  
  #define memset_io(a,b,c)	memset((void *)(a),(b),(c))
  #define memcpy_fromio(a,b,c)	memcpy((a),(void *)(b),(c))
  #define memcpy_toio(a,b,c)	memcpy((void *)(a),(b),(c))
  
  
  /* The following is junk needed for the arch-independent code but which
   * we never use in the CRIS port
   */
  
  #define IO_SPACE_LIMIT 0xffff
  #define inb(port) (cris_iops ? cris_iops->read_io(port,NULL,1,1) : 0)
  #define inw(port) (cris_iops ? cris_iops->read_io(port,NULL,2,1) : 0)
  #define inl(port) (cris_iops ? cris_iops->read_io(port,NULL,4,1) : 0)
  #define insb(port,addr,count) (cris_iops ? cris_iops->read_io(port,addr,1,count) : 0)
  #define insw(port,addr,count) (cris_iops ? cris_iops->read_io(port,addr,2,count) : 0)
  #define insl(port,addr,count) (cris_iops ? cris_iops->read_io(port,addr,4,count) : 0)
  #define outb(data,port) if (cris_iops) cris_iops->write_io(port,(void*)(unsigned)data,1,1)
  #define outw(data,port) if (cris_iops) cris_iops->write_io(port,(void*)(unsigned)data,2,1)
  #define outl(data,port) if (cris_iops) cris_iops->write_io(port,(void*)(unsigned)data,4,1)
  #define outsb(port,addr,count) if(cris_iops) cris_iops->write_io(port,(void*)addr,1,count)
  #define outsw(port,addr,count) if(cris_iops) cris_iops->write_io(port,(void*)addr,2,count)
  #define outsl(port,addr,count) if(cris_iops) cris_iops->write_io(port,(void*)addr,3,count)
  
  /*
   * Convert a physical pointer to a virtual kernel pointer for /dev/mem
   * access
   */
  #define xlate_dev_mem_ptr(p)	__va(p)
  
  /*
   * Convert a virtual cached pointer to an uncached pointer
   */
  #define xlate_dev_kmem_ptr(p)	p
  
  #endif
  