1 | /* |
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2 | * byteorder.h |
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3 | * |
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4 | * This file contains inline implementation of function to |
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5 | * deal with endian conversion. |
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6 | * |
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7 | * It is a stripped down version of linux ppc file... |
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8 | * |
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9 | * Copyright (C) 1999 Eric Valette (valette@crf.canon.fr) |
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10 | * Canon Centre Recherche France. |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in found in the file LICENSE in this distribution or at |
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14 | * http://www.OARcorp.com/rtems/license.html. |
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15 | * |
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16 | * $Id$ |
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17 | */ |
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18 | |
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19 | #ifndef _PPC_BYTEORDER_H |
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20 | #define _PPC_BYTEORDER_H |
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21 | |
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22 | /* |
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23 | * $Id$ |
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24 | */ |
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25 | |
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26 | #ifdef __GNUC__ |
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27 | |
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28 | extern __inline__ unsigned ld_le16(volatile unsigned short *addr) |
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29 | { |
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30 | unsigned val; |
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31 | |
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32 | __asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr)); |
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33 | return val; |
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34 | } |
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35 | |
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36 | extern __inline__ void st_le16(volatile unsigned short *addr, unsigned val) |
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37 | { |
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38 | __asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr)); |
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39 | } |
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40 | |
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41 | extern __inline__ unsigned ld_le32(volatile unsigned *addr) |
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42 | { |
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43 | unsigned val; |
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44 | |
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45 | __asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr)); |
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46 | return val; |
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47 | } |
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48 | |
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49 | extern __inline__ void st_le32(volatile unsigned *addr, unsigned val) |
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50 | { |
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51 | __asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr)); |
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52 | } |
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53 | |
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54 | /* alas, egcs sounds like it has a bug in this code that doesn't use the |
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55 | inline asm correctly, and can cause file corruption. Until I hear that |
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56 | it's fixed, I can live without the extra speed. I hope. */ |
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57 | #if !(__GNUC__ >= 2 && __GNUC_MINOR__ >= 90) |
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58 | #if 0 |
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59 | # define __arch_swab16(x) ld_le16(&x) |
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60 | # define __arch_swab32(x) ld_le32(&x) |
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61 | #else |
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62 | static __inline__ __const__ __unsigned short ___arch__swab16(__unsigned short value) |
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63 | { |
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64 | __unsigned int tmp; |
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65 | |
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66 | __asm__("rlwimi %0,%0,8,0xff0000" |
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67 | : "=r" (tmp) |
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68 | : "0" (value)); |
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69 | return (tmp&0x00ffff00)>>8; |
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70 | } |
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71 | |
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72 | static __inline__ __const__ __unsigned int ___arch__swab32(__unsigned int value) |
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73 | { |
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74 | __unsigned int result; |
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75 | |
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76 | __asm__("rotlwi %0,%1,24\n\t" |
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77 | "rlwimi %0,%1,8,0xff\n\t" |
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78 | "rlwimi %0,%1,8,0xff0000" |
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79 | : "=&r" (result) |
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80 | : "r" (value)); |
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81 | return result; |
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82 | } |
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83 | #define __arch__swab32(x) ___arch__swab32(x) |
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84 | #define __arch__swab16(x) ___arch__swab16(x) |
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85 | #endif /* 0 */ |
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86 | |
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87 | #endif |
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88 | |
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89 | /* The same, but returns converted value from the location pointer by addr. */ |
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90 | #define __arch__swab16p(addr) ld_le16(addr) |
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91 | #define __arch__swab32p(addr) ld_le32(addr) |
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92 | |
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93 | /* The same, but do the conversion in situ, ie. put the value back to addr. */ |
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94 | #define __arch__swab16s(addr) st_le16(addr,*addr) |
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95 | #define __arch__swab32s(addr) st_le32(addr,*addr) |
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96 | |
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97 | #endif /* __GNUC__ */ |
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98 | |
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99 | #endif /* _PPC_BYTEORDER_H */ |
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