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Public API Reference

csutil/threading/atomicops_gcc_ppc.h
00001 /*
00002   Copyright (C) 2006 by Marten Svanfeldt
00003 
00004   This library is free software; you can redistribute it and/or
00005   modify it under the terms of the GNU Lesser General Public
00006   License as published by the Free Software Foundation; either
00007   version 2 of the License, or (at your option) any later version.
00008 
00009   This library is distributed in the hope that it will be useful,
00010   but WITHOUT ANY WARRANTY; without even the implied warranty of
00011   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012   Library General Public License for more details.
00013 
00014   You should have received a copy of the GNU Library General Public
00015   License along with this library; if not, write to the Free
00016   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 */
00018 
00019 #ifndef __CS_CSUTIL_ATOMICOPS_GCC_PPC_H__
00020 #define __CS_CSUTIL_ATOMICOPS_GCC_PPC_H__
00021 
00022 #ifndef DOXYGEN_RUN
00023 
00024 namespace CS
00025 {
00026 namespace Threading
00027 {
00028   class AtomicOperationsPPCGCC
00029   {
00030   public:
00031     inline static int32 Set (int32* target, int32 value)
00032     {
00033       __asm__ __volatile__
00034         (
00035         "       lwsync \n"
00036         "1:     lwarx   %0,0,%2 \n"
00037         "       dcbt     0,%2 \n"
00038         "       stwcx.  %3,0,%2 \n"
00039         "       bne-    1b\n"
00040         "       isync \n"
00041         : "=&r" (value), "=m" (*(unsigned int *)target)
00042         : "r" (target), "r" (value), "m" (*(unsigned int *)target)
00043         : "cc", "memory"
00044         );
00045       return value;
00046     }
00047 
00048     inline static void* Set (void** target, void* value)
00049     {
00050 #if CS_PROCESSOR_SIZE == 32
00051       return (void*)Set ((int32*)target, (int32)value);
00052 #elif CS_PROCESSOR_SIZE == 64
00053       __asm__ __volatile__
00054         (
00055         "       lwsync \n"
00056         "1:     ldarx   %0,0,%2 \n"
00057         "       dcbt     0,%2 \n"
00058         "       stdcx.  %3,0,%2 \n"
00059         "       bne-    1b\n"
00060         "       isync \n"
00061         : "=&r" (value), "=m" (*(unsigned int *)target)
00062         : "r" (target), "r" (value), "m" (*(unsigned int *)target)
00063         : "cc", "memory"
00064         );
00065       return value;
00066 #endif
00067     }
00068 
00069     inline static int32 CompareAndSet (int32* target, int32 value,
00070       int32 comparand)
00071     {
00072       int32 prev;
00073 
00074       __asm__ __volatile__ (
00075       "       lwsync \n"
00076       "1:     lwarx   %0,0,%2\n"
00077       "       cmpw    0,%0,%3\n"
00078       "       bne-    2f\n"
00079       "       dcbt     0,%2 \n"
00080       "       stwcx.  %4,0,%2\n"
00081       "       bne-    1b\n"
00082       "       isync     \n"
00083       "2:"
00084       : "=&r" (prev), "=m" (*target)
00085       : "r" (target), "r" (comparand), "r" (value), "m" (*target)
00086       : "cc", "memory");
00087       return prev;
00088     }
00089 
00090     inline static void* CompareAndSet (void** target, void* value,
00091       void* comparand)
00092     {
00093 #if CS_PROCESSOR_SIZE == 32
00094       return (void*)CompareAndSet ((int32*)target, (int32)value, 
00095         (int32)comparand);
00096 #elif CS_PROCESSOR_SIZE == 64
00097       void* prev;
00098 
00099       __asm__ __volatile__ (
00100         "       lwsync \n"
00101         "1:     ldarx   %0,0,%2\n"
00102         "       cmpd    0,%0,%3\n"
00103         "       bne-    2f\n"
00104         "       dcbt     0,%2 \n"
00105         "       stdcx.  %4,0,%2\n"
00106         "       bne-    1b\n"
00107         "       isync     \n"
00108         "2:"
00109         : "=&r" (prev), "=m" (*target)
00110         : "r" (target), "r" (comparand), "r" (value), "m" (*target)
00111         : "cc", "memory");
00112       return prev;
00113 #endif
00114     }
00115 
00116     inline static int32 Increment (int32* target, int32 incr = 1)
00117     {
00118       int32 prev;
00119 
00120       __asm__ __volatile__ (
00121         "       lwsync \n"
00122         "1:     lwarx   %0,0,%1\n"
00123         "       addc    %0,%0,%2\n"
00124         "       stwcx.  %0,0,%1\n"
00125         "       bne-    1b\n"
00126         "       isync     \n"        
00127         : "=&r" (prev)
00128         : "r" (target), "r" (incr)
00129         : "cc", "memory");
00130       return prev;
00131     }
00132 
00133     inline static int32 Decrement (int32* target)
00134     {
00135       return (int32)Increment (target, -1);
00136     }
00137   };
00138 }
00139 }
00140 
00141 #endif // DOXYGEN_RUN
00142 
00143 #endif // __CS_CSUTIL_ATOMICOPS_GCC_PPC_H__

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