arm/sys/OSAtomic_resolvers.c

   1 /*
   2  * Copyright (c) 2010 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * This holds the C versions of OSAtomic.s resolver functions, used by
  26  * everyone except dyld.
  27  */
  28
  29 #include <arm/arch.h>
  30 #if defined(_ARM_ARCH_7) && !defined(VARIANT_DYLD)
  31
  32 #include <stdlib.h>
  33 #include <machine/cpu_capabilities.h>
  34 #include <mach/machine.h>
  35
  36 #define makeResolver_up_mp(name) \
  37         void name ## $VARIANT$up(void); \
  38         void name ## $VARIANT$mp(void); \
  39         void* name ## Resolver(void) __asm__( "_" #name ) ; \
  40         void* name ## Resolver(void) { \
  41                 __asm__(".symbol_resolver _" #name); \
  42                 /* return MP variant functions on kNumCPUs > 1 */ \
  43                 if ((_get_cpu_capabilities() & kUP) == 0) { \
  44                         return name ## $VARIANT$mp; \
  45                 } \
  46                 return name ## $VARIANT$up; \
  47         }
  48
  49 #define makeResolver_up_mp_wfe(name) \
  50         void name ## $VARIANT$up(void); \
  51         void name ## $VARIANT$mp(void); \
  52         void name ## $VARIANT$wfe(void); \
  53         void* name ## Resolver(void) __asm__( "_" #name ) ; \
  54         void* name ## Resolver(void) { \
  55                 __asm__(".symbol_resolver _" #name); \
  56                 int caps = _get_cpu_capabilities(); \
  57                 /* return WFE variant if we will get woken up */ \
  58                 if ((caps & (kHasEvent | kUP)) == kHasEvent) { \
  59                         return name ## $VARIANT$wfe; \
  60                 } \
  61                 /* return MP variant functions on kNumCPUs > 1 */ \
  62                 else if ((caps & kUP) == 0) { \
  63                         return name ## $VARIANT$mp; \
  64                 } \
  65                 return name ## $VARIANT$up; \
  66         }
  67
  68 #include "OSAtomic_resolvers.h"
  69
  70 #else // defined _ARM_ARCH_7 && !defined VARIANT_DYLD
  71
  72 typedef int emptyFilesArentCFiles;
  73
  74 #endif // defined _ARM_ARCH_7 && !defined VARIANT_DYLD