56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
#ifndef PORT_H
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#define PORT_H
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// swaps a 16-bit value
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static inline u16 swap16(u16 v)
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{
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return (v<<8)|(v>>8);
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}
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// swaps a 32-bit value
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static inline u32 swap32(u32 v)
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{
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return (v<<24)|((v<<8)&0xff0000)|((v>>8)&0xff00)|(v>>24);
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}
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#ifdef WORDS_BIGENDIAN
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#if defined(__GNUC__) && defined(__ppc__)
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#define READ16LE(base) \
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({ unsigned short lhbrxResult; \
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__asm__ ("lhbrx %0, 0, %1" : "=r" (lhbrxResult) : "r" (base) : "memory"); \
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lhbrxResult; })
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#define READ32LE(base) \
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({ unsigned long lwbrxResult; \
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__asm__ ("lwbrx %0, 0, %1" : "=r" (lwbrxResult) : "r" (base) : "memory"); \
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lwbrxResult; })
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#define WRITE16LE(base, value) \
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__asm__ ("sthbrx %0, 0, %1" : : "r" (value), "r" (base) : "memory")
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#define WRITE32LE(base, value) \
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__asm__ ("stwbrx %0, 0, %1" : : "r" (value), "r" (base) : "memory")
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#else
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#define READ16LE(x) \
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swap16(*((u16 *)(x)))
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#define READ32LE(x) \
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swap32(*((u32 *)(x)))
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#define WRITE16LE(x,v) \
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*((u16 *)x) = swap16((v))
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#define WRITE32LE(x,v) \
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*((u32 *)x) = swap32((v))
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#endif
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#else
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#define READ16LE(x) \
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*((u16 *)x)
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#define READ32LE(x) \
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*((u32 *)x)
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#define WRITE16LE(x,v) \
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*((u16 *)x) = (v)
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#define WRITE32LE(x,v) \
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*((u32 *)x) = (v)
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#endif
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#endif // PORT_H
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