include/asm-ppc/byteorder.h

   1 #ifndef _PPC_BYTEORDER_H
   2 #define _PPC_BYTEORDER_H
   3
   4 #include <asm/types.h>
   5 #include <linux/compiler.h>
   6
   7 #ifdef __GNUC__
   8 #ifdef __KERNEL__
   9
  10 extern __inline__ unsigned ld_le16(const volatile unsigned short *addr)
  11 {
  12         unsigned val;
  13
  14         __asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
  15         return val;
  16 }
  17
  18 extern __inline__ void st_le16(volatile unsigned short *addr, const unsigned val)
  19 {
  20         __asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
  21 }
  22
  23 extern __inline__ unsigned ld_le32(const volatile unsigned *addr)
  24 {
  25         unsigned val;
  26
  27         __asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
  28         return val;
  29 }
  30
  31 extern __inline__ void st_le32(volatile unsigned *addr, const unsigned val)
  32 {
  33         __asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
  34 }
  35
  36 static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 value)
  37 {
  38         __u16 result;
  39
  40         __asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (value >> 8), "r" (value));
  41         return result;
  42 }
  43
  44 static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 value)
  45 {
  46         __u32 result;
  47
  48         __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (value>>24), "r" (value));
  49         __asm__("rlwimi %0,%2,8,8,15"   : "=&r" (result) : "0" (result),    "r" (value));
  50         __asm__("rlwimi %0,%2,24,0,7"   : "=&r" (result) : "0" (result),    "r" (value));
  51
  52         return result;
  53 }
  54 #define __arch__swab32(x) ___arch__swab32(x)
  55 #define __arch__swab16(x) ___arch__swab16(x)
  56
  57 /* The same, but returns converted value from the location pointer by addr. */
  58 #define __arch__swab16p(addr) ld_le16(addr)
  59 #define __arch__swab32p(addr) ld_le32(addr)
  60
  61 /* The same, but do the conversion in situ, ie. put the value back to addr. */
  62 #define __arch__swab16s(addr) st_le16(addr,*addr)
  63 #define __arch__swab32s(addr) st_le32(addr,*addr)
  64
  65 #endif /* __KERNEL__ */
  66
  67 #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
  68 #  define __BYTEORDER_HAS_U64__
  69 #  define __SWAB_64_THRU_32__
  70 #endif
  71
  72 #endif /* __GNUC__ */
  73
  74 #include <linux/byteorder/big_endian.h>
  75
  76 #endif /* _PPC_BYTEORDER_H */