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Commit 98fd433a authored by Cédric Le Goater's avatar Cédric Le Goater Committed by Benjamin Herrenschmidt
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powerpc/boot: Define byteswapping routines for little endian 



These are not the most efficient versions of swab but the wrapper does
not do much byte swapping. On a big endian cpu, these routines are
a no-op.

Signed-off-by: default avatarCédric Le Goater <clg@fr.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent b636031a

arch/powerpc/boot/of.h

+7 −0
Original line number Diff line number Diff line 
#ifndef _PPC_BOOT_OF_H_

#define _PPC_BOOT_OF_H_



#include "swab.h"



typedef void *phandle;

typedef u32 ihandle;
@@ -21,8 +23,13 @@ void of_console_init(void); 


typedef u32			__be32;



#ifdef __LITTLE_ENDIAN__

#define cpu_to_be32(x) swab32(x)

#define be32_to_cpu(x) swab32(x)

#else

#define cpu_to_be32(x) (x)

#define be32_to_cpu(x) (x)

#endif



#define PROM_ERROR (-1u)

arch/powerpc/boot/swab.h

0 → 100644
+29 −0
Original line number Diff line number Diff line 
#ifndef _PPC_BOOT_SWAB_H_

#define _PPC_BOOT_SWAB_H_



static inline u16 swab16(u16 x)

{

	return  ((x & (u16)0x00ffU) << 8) |

		((x & (u16)0xff00U) >> 8);

}



static inline u32 swab32(u32 x)

{

	return  ((x & (u32)0x000000ffUL) << 24) |

		((x & (u32)0x0000ff00UL) <<  8) |

		((x & (u32)0x00ff0000UL) >>  8) |

		((x & (u32)0xff000000UL) >> 24);

}



static inline u64 swab64(u64 x)

{

	return  (u64)((x & (u64)0x00000000000000ffULL) << 56) |

		(u64)((x & (u64)0x000000000000ff00ULL) << 40) |

		(u64)((x & (u64)0x0000000000ff0000ULL) << 24) |

		(u64)((x & (u64)0x00000000ff000000ULL) <<  8) |

		(u64)((x & (u64)0x000000ff00000000ULL) >>  8) |

		(u64)((x & (u64)0x0000ff0000000000ULL) >> 24) |

		(u64)((x & (u64)0x00ff000000000000ULL) >> 40) |

		(u64)((x & (u64)0xff00000000000000ULL) >> 56);

}

#endif /* _PPC_BOOT_SWAB_H_ */