1 #ifndef _PPC_BYTEORDER_H 2 #define _PPC_BYTEORDER_H 3 4 #include <asm/types.h> 5 6 #ifdef __GNUC__ 7 8 extern __inline__ unsigned ld_le16(const volatile unsigned short *addr) 9 { 10 unsigned val; 11 12 __asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr)); 13 return val; 14 } 15 16 extern __inline__ void st_le16(volatile unsigned short *addr, const unsigned val) 17 { 18 __asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr)); 19 } 20 21 extern __inline__ unsigned ld_le32(const volatile unsigned *addr) 22 { 23 unsigned val; 24 25 __asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr)); 26 return val; 27 } 28 29 extern __inline__ void st_le32(volatile unsigned *addr, const unsigned val) 30 { 31 __asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr)); 32 } 33 34 /* alas, egcs sounds like it has a bug in this code that doesn't use the 35 inline asm correctly, and can cause file corruption. Until I hear that 36 it's fixed, I can live without the extra speed. I hope. */ 37 #if !(__GNUC__ >= 2 && __GNUC_MINOR__ >= 90) 38 #if 0 39 # define __arch_swab16(x) ld_le16(&x) 40 # define __arch_swab32(x) ld_le32(&x) 41 #else 42 static __inline__ __attribute__((const)) __u16 ___arch__swab16(__u16 value) 43 { 44 __u16 result; 45 46 __asm__("rlwimi %0,%1,8,16,23" 47 : "=r" (result) 48 : "r" (value), "0" (value >> 8)); 49 return result; 50 } 51 52 static __inline__ __attribute__((const)) __u32 ___arch__swab32(__u32 value) 53 { 54 __u32 result; 55 56 __asm__("rlwimi %0,%1,24,16,23\n\t" 57 "rlwimi %0,%1,8,8,15\n\t" 58 "rlwimi %0,%1,24,0,7" 59 : "=r" (result) 60 : "r" (value), "0" (value >> 24)); 61 return result; 62 } 63 #define __arch__swab32(x) ___arch__swab32(x) 64 #define __arch__swab16(x) ___arch__swab16(x) 65 #endif /* 0 */ 66 67 #endif 68 69 /* The same, but returns converted value from the location pointer by addr. */ 70 #define __arch__swab16p(addr) ld_le16(addr) 71 #define __arch__swab32p(addr) ld_le32(addr) 72 73 /* The same, but do the conversion in situ, ie. put the value back to addr. */ 74 #define __arch__swab16s(addr) st_le16(addr,*addr) 75 #define __arch__swab32s(addr) st_le32(addr,*addr) 76 77 #endif /* __GNUC__ */ 78 79 #if defined(__GNUC__) && !defined(__STRICT_ANSI__) 80 #define __BYTEORDER_HAS_U64__ 81 #endif 82 #include <linux/byteorder/big_endian.h> 83 84 #endif /* _PPC_BYTEORDER_H */ 85