diff options
Diffstat (limited to 'arch/cris/arch-v32/lib/spinlock.S')
| -rw-r--r-- | arch/cris/arch-v32/lib/spinlock.S | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/cris/arch-v32/lib/spinlock.S b/arch/cris/arch-v32/lib/spinlock.S new file mode 100644 index 00000000..fe610b9d --- /dev/null +++ b/arch/cris/arch-v32/lib/spinlock.S @@ -0,0 +1,40 @@ +;; Core of the spinlock implementation +;; +;; Copyright (C) 2004 Axis Communications AB. +;; +;; Author: Mikael Starvik + + + .global cris_spin_lock + .type cris_spin_lock,@function + .global cris_spin_trylock + .type cris_spin_trylock,@function + + .text + +cris_spin_lock: + clearf p +1: test.b [$r10] + beq 1b + clearf p + ax + clear.b [$r10] + bcs 1b + clearf p + ret + nop + + .size cris_spin_lock, . - cris_spin_lock + +cris_spin_trylock: + clearf p +1: move.b [$r10], $r11 + ax + clear.b [$r10] + bcs 1b + clearf p + ret + movu.b $r11,$r10 + + .size cris_spin_trylock, . - cris_spin_trylock + |