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https://opencores.org/ocsvn/c0or1k/c0or1k/trunk
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/*
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* Copyright (C) 2009 Bahadir Balban
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*/
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#include
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#include
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/*
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* These use the same lock word for both being granted
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* exclusive access to the word, and for storing lock values.
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*/
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BEGIN_PROC(__l4_mutex_lock)
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mov r2, #-2
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1:
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swp r1, r2, [r0]
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cmp r1, r2
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beq 1b
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@ Grabbed the lock,
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add r1, r1, #1 @ now increment its value
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str r1, [r0] @ Store and finish
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cmp r1, #L4_MUTEX_LOCKED @ Have we locked it?
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moveq r0, #L4_MUTEX_SUCCESS
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movne r0, #L4_MUTEX_CONTENDED
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mov pc, lr
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END_PROC(__l4_mutex_lock)
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BEGIN_PROC(__l4_mutex_unlock)
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mov r2, #-2
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mov r1, #L4_MUTEX_UNLOCKED
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1:
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swp r3, r2, [r0]
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cmp r3, r2
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beq 1b
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@ Grabbed the lock
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str r1, [r0] @ Now store unlocked value and finish
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mov r0, r3 @ Get the value of contenders
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mov pc, lr
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END_PROC(__l4_mutex_unlock)
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