arch/ppc/include/asm/byteorder.h

   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 */