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io.h

#ifndef _IO_H
#define __IO_H

#include "types.h"

/*
 * Low-level I/O routines.
 *
 * Copied from <file:arch/powerpc/include/asm/io.h> (which has no copyright)
 */
static inline int in_8(const volatile unsigned char *addr)
{
      int ret;

      __asm__ __volatile__("lbz%U1%X1 %0,%1; twi 0,%0,0; isync"
                       : "=r" (ret) : "m" (*addr));
      return ret;
}

static inline void out_8(volatile unsigned char *addr, int val)
{
      __asm__ __volatile__("stb%U0%X0 %1,%0; sync"
                       : "=m" (*addr) : "r" (val));
}

static inline unsigned in_le16(const volatile u16 *addr)
{
      unsigned ret;

      __asm__ __volatile__("lhbrx %0,0,%1; twi 0,%0,0; isync"
                       : "=r" (ret) : "r" (addr), "m" (*addr));

      return ret;
}

static inline unsigned in_be16(const volatile u16 *addr)
{
      unsigned ret;

      __asm__ __volatile__("lhz%U1%X1 %0,%1; twi 0,%0,0; isync"
                       : "=r" (ret) : "m" (*addr));
      return ret;
}

static inline void out_le16(volatile u16 *addr, int val)
{
      __asm__ __volatile__("sthbrx %1,0,%2; sync" : "=m" (*addr)
                       : "r" (val), "r" (addr));
}

static inline void out_be16(volatile u16 *addr, int val)
{
      __asm__ __volatile__("sth%U0%X0 %1,%0; sync"
                       : "=m" (*addr) : "r" (val));
}

static inline unsigned in_le32(const volatile unsigned *addr)
{
      unsigned ret;

      __asm__ __volatile__("lwbrx %0,0,%1; twi 0,%0,0; isync"
                       : "=r" (ret) : "r" (addr), "m" (*addr));
      return ret;
}

static inline unsigned in_be32(const volatile unsigned *addr)
{
      unsigned ret;

      __asm__ __volatile__("lwz%U1%X1 %0,%1; twi 0,%0,0; isync"
                       : "=r" (ret) : "m" (*addr));
      return ret;
}

static inline void out_le32(volatile unsigned *addr, int val)
{
      __asm__ __volatile__("stwbrx %1,0,%2; sync" : "=m" (*addr)
                       : "r" (val), "r" (addr));
}

static inline void out_be32(volatile unsigned *addr, int val)
{
      __asm__ __volatile__("stw%U0%X0 %1,%0; sync"
                       : "=m" (*addr) : "r" (val));
}

static inline void sync(void)
{
      asm volatile("sync" : : : "memory");
}

static inline void eieio(void)
{
      asm volatile("eieio" : : : "memory");
}

static inline void barrier(void)
{
      asm volatile("" : : : "memory");
}

#endif /* _IO_H */

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