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 */ 8static 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 17static 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 23static 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 32static 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 41static 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 47static 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 */ 54