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-rw-r--r--arch/cris/arch-v32/lib/spinlock.S33
1 files changed, 33 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
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--- /dev/null
+++ b/arch/cris/arch-v32/lib/spinlock.S
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+;; 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.d [$r10]
+ beq 1b
+ clearf p
+ ax
+ clear.d [$r10]
+ bcs 1b
+ clearf p
+ ret
+ nop
+
+cris_spin_trylock:
+ clearf p
+1: move.d [$r10], $r11
+ ax
+ clear.d [$r10]
+ bcs 1b
+ clearf p
+ ret
+ move.d $r11,$r10
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