satip-axe/kernel/arch/cris/arch-v32/lib/spinlock.S
2015-03-26 17:24:57 +01:00

34 lines
420 B
ArmAsm

;; Core of the spinlock implementation
;;
;; Copyright (C) 2004 Axis Communications AB.
;;
;; Author: Mikael Starvik
.global cris_spin_lock
.global cris_spin_trylock
.text
cris_spin_lock:
clearf p
1: test.b [$r10]
beq 1b
clearf p
ax
clear.b [$r10]
bcs 1b
clearf p
ret
nop
cris_spin_trylock:
clearf p
1: move.b [$r10], $r11
ax
clear.b [$r10]
bcs 1b
clearf p
ret
movu.b $r11,$r10