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[/] [c0or1k/] [trunk/] [src/] [arch/] [arm/] [v5/] [atomic.S.ARM] - Diff between revs 2 and 6
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Rev 6 |
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/*
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* Copyright (C) 2010 B Labs
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*
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* Author: Bahadir Balban
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*/
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#include INC_ARCH(asm.h)
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/*
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* Atomically and destructively reads a byte. E.g.
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* byte is read and zero is written back. This is
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* useful on reading irq counts
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*
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* @r0 = byte address
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*/
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BEGIN_PROC(l4_atomic_dest_readb)
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mov r1, #0
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swpb r2, r1, [r0]
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mov r0, r2
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mov pc, lr
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END_PROC(l4_atomic_dest_readb)
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