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[DDK]: Add MEMORY_BARRIER missing from ioaccess.h.
svn path=/trunk/; revision=46067
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@ -41,6 +41,8 @@ extern "C" {
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#define WRITE_PORT_USHORT(p, v) __outword (H2I(p), (v))
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#define WRITE_PORT_ULONG(p, v) __outdword (H2I(p), (v))
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#define MEMORY_BARRIER()
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#elif defined(_PPC_) || defined(_MIPS_) || defined(_ARM_)
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#define READ_REGISTER_UCHAR(r) (*(volatile UCHAR * const)(r))
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