arch/cris/arch-v32/lib/spinlock.S

   1 ;; Core of the spinlock implementation
   2 ;;
   3 ;; Copyright (C) 2004 Axis Communications AB.
   4 ;;
   5 ;; Author: Mikael Starvik
   6
   7
   8         .global cris_spin_lock
   9         .type   cris_spin_lock,@function
  10         .global cris_spin_trylock
  11         .type   cris_spin_trylock,@function
  12
  13         .text
  14
  15 cris_spin_lock:
  16         clearf  p
  17 1:      test.b  [$r10]
  18         beq     1b
  19         clearf  p
  20         ax
  21         clear.b [$r10]
  22         bcs     1b
  23         clearf  p
  24         ret
  25         nop
  26
  27         .size   cris_spin_lock, . - cris_spin_lock
  28
  29 cris_spin_trylock:
  30         clearf  p
  31 1:      move.b  [$r10], $r11
  32         ax
  33         clear.b [$r10]
  34         bcs     1b
  35         clearf  p
  36         ret
  37         movu.b  $r11,$r10
  38
  39         .size   cris_spin_trylock, . - cris_spin_trylock
  40