arch/powerpc/boot/io.h

   1 #ifndef _IO_H
   2 #define __IO_H
   3 /*
   4  * Low-level I/O routines.
   5  *
   6  * Copied from <file:include/asm-powerpc/io.h> (which has no copyright)
   7  */
   8 static inline int in_8(const volatile unsigned char *addr)
   9 {
  10         int ret;
  11
  12         __asm__ __volatile__("lbz%U1%X1 %0,%1; twi 0,%0,0; isync"
  13                              : "=r" (ret) : "m" (*addr));
  14         return ret;
  15 }
  16
  17 static inline void out_8(volatile unsigned char *addr, int val)
  18 {
  19         __asm__ __volatile__("stb%U0%X0 %1,%0; sync"
  20                              : "=m" (*addr) : "r" (val));
  21 }
  22
  23 static inline unsigned in_le32(const volatile unsigned *addr)
  24 {
  25         unsigned ret;
  26
  27         __asm__ __volatile__("lwbrx %0,0,%1; twi 0,%0,0; isync"
  28                              : "=r" (ret) : "r" (addr), "m" (*addr));
  29         return ret;
  30 }
  31
  32 static inline unsigned in_be32(const volatile unsigned *addr)
  33 {
  34         unsigned ret;
  35
  36         __asm__ __volatile__("lwz%U1%X1 %0,%1; twi 0,%0,0; isync"
  37                              : "=r" (ret) : "m" (*addr));
  38         return ret;
  39 }
  40
  41 static inline void out_le32(volatile unsigned *addr, int val)
  42 {
  43         __asm__ __volatile__("stwbrx %1,0,%2; sync" : "=m" (*addr)
  44                              : "r" (val), "r" (addr));
  45 }
  46
  47 static inline void out_be32(volatile unsigned *addr, int val)
  48 {
  49         __asm__ __volatile__("stw%U0%X0 %1,%0; sync"
  50                              : "=m" (*addr) : "r" (val));
  51 }
  52
  53 #endif /* _IO_H */