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 */ 54