22 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 
  27         .file   "atomic.s"
  28 
  29 #include <sys/asm_linkage.h>
  30 
  31 /*
  32  * ATOMIC_BO_ENABLE_SHIFT can be selectively defined by processors
  33  * to enable exponential backoff. No definition means backoff is
  34  * not desired i.e. backoff should be disabled.
  35  * By default, the shift value is used to generate a power of 2
  36  * value for backoff limit. In the kernel, processors scale this
  37  * shift value with the number of online cpus.
  38  */
  39 
  40 #if defined(_KERNEL)
  41         /*
  42          * Legacy kernel interfaces; they will go away (eventually).

  43          */
  44         ANSI_PRAGMA_WEAK2(cas8,atomic_cas_8,function)
  45         ANSI_PRAGMA_WEAK2(cas32,atomic_cas_32,function)
  46         ANSI_PRAGMA_WEAK2(cas64,atomic_cas_64,function)
  47         ANSI_PRAGMA_WEAK2(caslong,atomic_cas_ulong,function)
  48         ANSI_PRAGMA_WEAK2(casptr,atomic_cas_ptr,function)
  49         ANSI_PRAGMA_WEAK2(atomic_and_long,atomic_and_ulong,function)
  50         ANSI_PRAGMA_WEAK2(atomic_or_long,atomic_or_ulong,function)
  51         ANSI_PRAGMA_WEAK2(swapl,atomic_swap_32,function)
  52 
  53 #ifdef ATOMIC_BO_ENABLE_SHIFT
  54 
  55 #if !defined(lint)
  56         .weak   cpu_atomic_delay
  57         .type   cpu_atomic_delay, #function
  58 #endif  /* lint */
  59 
  60 /*
  61  * For the kernel, invoke processor specific delay routine to perform
  62  * low-impact spin delay. The value of ATOMIC_BO_ENABLE_SHIFT is tuned

  22 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 
  27         .file   "atomic.s"
  28 
  29 #include <sys/asm_linkage.h>
  30 
  31 /*
  32  * ATOMIC_BO_ENABLE_SHIFT can be selectively defined by processors
  33  * to enable exponential backoff. No definition means backoff is
  34  * not desired i.e. backoff should be disabled.
  35  * By default, the shift value is used to generate a power of 2
  36  * value for backoff limit. In the kernel, processors scale this
  37  * shift value with the number of online cpus.
  38  */
  39 
  40 #if defined(_KERNEL)
  41         /*
  42          * Legacy kernel interfaces; they will go away the moment our closed
  43          * bins no longer require them.
  44          */
  45         ANSI_PRAGMA_WEAK2(cas8,atomic_cas_8,function)
  46         ANSI_PRAGMA_WEAK2(cas32,atomic_cas_32,function)
  47         ANSI_PRAGMA_WEAK2(cas64,atomic_cas_64,function)
  48         ANSI_PRAGMA_WEAK2(caslong,atomic_cas_ulong,function)
  49         ANSI_PRAGMA_WEAK2(casptr,atomic_cas_ptr,function)
  50         ANSI_PRAGMA_WEAK2(atomic_and_long,atomic_and_ulong,function)
  51         ANSI_PRAGMA_WEAK2(atomic_or_long,atomic_or_ulong,function)
  52         ANSI_PRAGMA_WEAK2(swapl,atomic_swap_32,function)
  53 
  54 #ifdef ATOMIC_BO_ENABLE_SHIFT
  55 
  56 #if !defined(lint)
  57         .weak   cpu_atomic_delay
  58         .type   cpu_atomic_delay, #function
  59 #endif  /* lint */
  60 
  61 /*
  62  * For the kernel, invoke processor specific delay routine to perform
  63  * low-impact spin delay. The value of ATOMIC_BO_ENABLE_SHIFT is tuned