[abd9401] | 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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