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         .global cris_spin_trylock
  10
  11         .text
  12
  13 cris_spin_lock:
  14         clearf  p
  15 1:      test.b  [$r10]
  16         beq     1b
  17         clearf  p
  18         ax
  19         clear.b [$r10]
  20         bcs     1b
  21         clearf  p
  22         ret
  23         nop
  24
  25 cris_spin_trylock:
  26         clearf  p
  27 1:      move.b  [$r10], $r11
  28         ax
  29         clear.b [$r10]
  30         bcs     1b
  31         clearf  p
  32         ret
  33         movu.b  $r11,$r10