text: #ifndef _M68KNOMMU_IO_H
  #define _M68KNOMMU_IO_H
  
  #ifdef __KERNEL__
  
  #include <asm/virtconvert.h>
  
  /*
   * These are for ISA/PCI shared memory _only_ and should never be used
   * on any other type of memory, including Zorro memory. They are meant to
   * access the bus in the bus byte order which is little-endian!.
   *
   * readX/writeX() are used to access memory mapped devices. On some
   * architectures the memory mapped IO stuff needs to be accessed
   * differently. On the m68k architecture, we just read/write the
   * memory location directly.
   */
  /* ++roman: The assignments to temp. vars avoid that gcc sometimes generates
   * two accesses to memory, which may be undesirable for some devices.
   */
  
  /*
   * swap functions are sometimes needed to interface little-endian hardware
   */
  static inline unsigned short _swapw(volatile unsigned short v)
  {
      return ((v << 8) | (v >> 8));
  }
  
  static inline unsigned int _swapl(volatile unsigned long v)
  {
      return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
  }
  
  #define readb(addr) \
      ({ unsigned char __v = (*(volatile unsigned char *) (addr)); __v; })
  #define readw(addr) \
      ({ unsigned short __v = (*(volatile unsigned short *) (addr)); __v; })
  #define readl(addr) \
      ({ unsigned int __v = (*(volatile unsigned int *) (addr)); __v; })
  
  #define readb_relaxed(addr) readb(addr)
  #define readw_relaxed(addr) readw(addr)
  #define readl_relaxed(addr) readl(addr)
  
  #define writeb(b,addr) (void)((*(volatile unsigned char *) (addr)) = (b))
  #define writew(b,addr) (void)((*(volatile unsigned short *) (addr)) = (b))
  #define writel(b,addr) (void)((*(volatile unsigned int *) (addr)) = (b))
  
  #define __raw_readb readb
  #define __raw_readw readw
  #define __raw_readl readl
  #define __raw_writeb writeb
  #define __raw_writew writew
  #define __raw_writel writel
  
  static inline void io_outsb(unsigned int addr, void *buf, int len)
  {
  	volatile unsigned char *ap = (volatile unsigned char *) addr;
  	unsigned char *bp = (unsigned char *) buf;
  	while (len--)
  		*ap = *bp++;
  }
  
  static inline void io_outsw(unsigned int addr, void *buf, int len)
  {
  	volatile unsigned short *ap = (volatile unsigned short *) addr;
  	unsigned short *bp = (unsigned short *) buf;
  	while (len--)
  		*ap = _swapw(*bp++);
  }
  
  static inline void io_outsl(unsigned int addr, void *buf, int len)
  {
  	volatile unsigned int *ap = (volatile unsigned int *) addr;
  	unsigned int *bp = (unsigned int *) buf;
  	while (len--)
  		*ap = _swapl(*bp++);
  }
  
  static inline void io_insb(unsigned int addr, void *buf, int len)
  {
  	volatile unsigned char *ap = (volatile unsigned char *) addr;
  	unsigned char *bp = (unsigned char *) buf;
  	while (len--)
  		*bp++ = *ap;
  }
  
  static inline void io_insw(unsigned int addr, void *buf, int len)
  {
  	volatile unsigned short *ap = (volatile unsigned short *) addr;
  	unsigned short *bp = (unsigned short *) buf;
  	while (len--)
  		*bp++ = _swapw(*ap);
  }
  
  static inline void io_insl(unsigned int addr, void *buf, int len)
  {
  	volatile unsigned int *ap = (volatile unsigned int *) addr;
  	unsigned int *bp = (unsigned int *) buf;
  	while (len--)
  		*bp++ = _swapl(*ap);
  }
  
  #define mmiowb()
  
  /*
   *	make the short names macros so specific devices
   *	can override them as required
   */
  
  #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))
  
  #define inb(addr)    readb(addr)
  #define inw(addr)    readw(addr)
  #define inl(addr)    readl(addr)
  #define outb(x,addr) ((void) writeb(x,addr))
  #define outw(x,addr) ((void) writew(x,addr))
  #define outl(x,addr) ((void) writel(x,addr))
  
  #define inb_p(addr)    inb(addr)
  #define inw_p(addr)    inw(addr)
  #define inl_p(addr)    inl(addr)
  #define outb_p(x,addr) outb(x,addr)
  #define outw_p(x,addr) outw(x,addr)
  #define outl_p(x,addr) outl(x,addr)
  
  #define outsb(a,b,l) io_outsb(a,b,l)
  #define outsw(a,b,l) io_outsw(a,b,l)
  #define outsl(a,b,l) io_outsl(a,b,l)
  
  #define insb(a,b,l) io_insb(a,b,l)
  #define insw(a,b,l) io_insw(a,b,l)
  #define insl(a,b,l) io_insl(a,b,l)
  
  #define IO_SPACE_LIMIT 0xffffffff
  
  
  /* Values for nocacheflag and cmode */
  #define IOMAP_FULL_CACHING		0
  #define IOMAP_NOCACHE_SER		1
  #define IOMAP_NOCACHE_NONSER		2
  #define IOMAP_WRITETHROUGH		3
  
  static inline void *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
  {
  	return (void *) physaddr;
  }
  static inline void *ioremap(unsigned long physaddr, unsigned long size)
  {
  	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
  }
  static inline void *ioremap_nocache(unsigned long physaddr, unsigned long size)
  {
  	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
  }
  static inline void *ioremap_writethrough(unsigned long physaddr, unsigned long size)
  {
  	return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
  }
  static inline void *ioremap_fullcache(unsigned long physaddr, unsigned long size)
  {
  	return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
  }
  
  #define	iounmap(addr)	do { } while(0)
  
  /*
   * 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 /* __KERNEL__ */
  
  #endif /* _M68KNOMMU_IO_H */
  