osfmk/arm/counter.c

   1 /* * Copyright (c) 2020 Apple Inc. All rights reserved.
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   3  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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  12  * terms of an Apple operating system software license agreement.
  13  *
  14  * Please obtain a copy of the License at
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  17  * The Original Code and all software distributed under the License are
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  26  */
  27
  28 #include <kern/assert.h>
  29 #include <kern/cpu_data.h>
  30 #include <kern/counter.h>
  31 #include <kern/zalloc.h>
  32 #include <machine/atomic.h>
  33 #include <machine/machine_routines.h>
  34 #include <machine/cpu_number.h>
  35
  36 OS_OVERLOADABLE
  37 void
  38 counter_add(scalable_counter_t *counter, uint64_t amount)
  39 {
  40         os_atomic_add(zpercpu_get(*counter), amount, relaxed);
  41 }
  42
  43 OS_OVERLOADABLE
  44 void
  45 counter_inc(scalable_counter_t *counter)
  46 {
  47         os_atomic_inc(zpercpu_get(*counter), relaxed);
  48 }
  49
  50 OS_OVERLOADABLE
  51 void
  52 counter_dec(scalable_counter_t *counter)
  53 {
  54         os_atomic_dec(zpercpu_get(*counter), relaxed);
  55 }
  56
  57 /*
  58  * NB: On arm, the preemption disabled implementation is the same as
  59  * the normal implementation. Otherwise we would need to enforce that
  60  * callers never mix the interfaces for the same counter.
  61  */
  62 OS_OVERLOADABLE
  63 void
  64 counter_add_preemption_disabled(scalable_counter_t *counter, uint64_t amount)
  65 {
  66         counter_add(counter, amount);
  67 }
  68
  69 OS_OVERLOADABLE
  70 void
  71 counter_inc_preemption_disabled(scalable_counter_t *counter)
  72 {
  73         counter_inc(counter);
  74 }
  75
  76 OS_OVERLOADABLE
  77 void
  78 counter_dec_preemption_disabled(scalable_counter_t *counter)
  79 {
  80         counter_dec(counter);
  81 }