198 lines
5.3 KiB
C
198 lines
5.3 KiB
C
/***************************************************************************
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* Copyright 2007 - 2009 VMware, Inc. All rights reserved.
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***************************************************************************/
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/*
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* @VMKAPIMOD_LICENSE@
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*/
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/*
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***********************************************************************
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* Bits */ /**
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* \addtogroup Lib
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* @{
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* \defgroup Bits Bit Manipulation
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*
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* Utility interfaces for bit shifting, flipping, etc.
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*
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* @{
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***********************************************************************
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*/
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#ifndef _VMKAPI_BITS_H_
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#define _VMKAPI_BITS_H_
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/** \cond never */
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#ifndef VMK_HEADER_INCLUDED_FROM_VMKAPI_H
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#error This vmkapi file should never be included directly but only via vmkapi.h
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#endif
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/** \endcond never */
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/*
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***********************************************************************
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* vmk_CPUToBE64 -- */ /**
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*
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* \brief Convert an unsigned 64 bit unsigned integer in the
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* CPU native endian format into a big endian 64 bit
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* unsigned integer.
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*
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* \param[in] x Value to swap
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*
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* \return Swapped value.
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*
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* \sa vmk_BE64ToCPU
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*
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***********************************************************************
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*/
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static inline vmk_uint64
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vmk_CPUToBE64(vmk_uint64 x)
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{
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#if defined(__x86_64__) && defined(__GNUC__)
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if (!__builtin_constant_p(x)) {
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__asm__ ("bswapq %0"
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: "=r" (x)
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: "0" (x));
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return x;
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}
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#endif
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return ((x >> 56) & VMK_CONST64U(0x00000000000000FF)) |
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((x >> 40) & VMK_CONST64U(0x000000000000FF00)) |
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((x >> 24) & VMK_CONST64U(0x0000000000FF0000)) |
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((x >> 8) & VMK_CONST64U(0x00000000FF000000)) |
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((x << 8) & VMK_CONST64U(0x000000FF00000000)) |
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((x << 24) & VMK_CONST64U(0x0000FF0000000000)) |
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((x << 40) & VMK_CONST64U(0x00FF000000000000)) |
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((x << 56) & VMK_CONST64U(0xFF00000000000000));
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}
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/*
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***********************************************************************
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* vmk_BE64ToCPU -- */ /**
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*
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* \brief Convert an unsigned 64 bit unsigned integer in the
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* big endian format into a 64 bit unsigned integer in
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* the native CPU endian format.
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*
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* \param[in] x Value to swap
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*
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* \return Swapped value.
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*
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* \sa vmk_CPUToBE64
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*
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***********************************************************************
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*/
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static inline vmk_uint64
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vmk_BE64ToCPU(vmk_uint64 x)
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{
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return vmk_CPUToBE64(x);
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}
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/*
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***********************************************************************
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* vmk_CPUToBE32 -- */ /**
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*
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* \brief Convert an unsigned 32 bit unsigned integer in the
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* CPU native endian format into a big endian 32 bit
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* unsigned integer.
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*
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* \param[in] x Value to swap
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*
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* \return Swapped value.
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*
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* \sa vmk_BE32ToCPU
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*
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***********************************************************************
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*/
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static inline vmk_uint32
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vmk_CPUToBE32(vmk_uint32 x)
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{
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#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
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if (!__builtin_constant_p(x)) {
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__asm__ ("bswap %0"
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: "=r" (x)
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: "0" (x));
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return x;
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}
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#endif
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return ((x >> 24) & 0x000000ff) | ((x >> 8) & 0x0000ff00) |
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((x << 8) & 0x00ff0000) | ((x << 24) & 0xff000000);
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}
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/*
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***********************************************************************
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* vmk_BE32ToCPU -- */ /**
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*
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* \brief Convert an unsigned 32 bit unsigned integer in the
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* big endian format into a 32 bit unsigned integer in
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* the native CPU endian format.
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*
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* \param[in] x Value to swap
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*
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* \return Swapped value.
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*
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* \sa vmk_CPUToBE32
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*
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***********************************************************************
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*/
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static inline vmk_uint32
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vmk_BE32ToCPU(vmk_uint32 x)
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{
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return vmk_CPUToBE32(x);
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}
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/*
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***********************************************************************
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* vmk_CPUToBE16 -- */ /**
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*
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* \brief Convert an unsigned 16 bit unsigned integer in the
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* CPU native endian format into a big endian 16 bit
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* unsigned integer.
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*
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* \param[in] x Value to swap
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*
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* \return Swapped value.
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*
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* \sa vmk_BE16ToCPU
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*
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***********************************************************************
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*/
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static inline vmk_uint16
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vmk_CPUToBE16(vmk_uint16 x)
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{
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#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
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if (!__builtin_constant_p(x)) {
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int bits = 8;
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__asm__ ("rolw %%cl, %0"
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: "=r" (x)
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: "0" (x), "c" (bits));
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return x;
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}
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#endif
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return ((x >> 8) & 0x00ff) | ((x << 8) & 0xff00);
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}
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/*
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***********************************************************************
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* vmk_BE16ToCPU -- */ /**
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*
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* \brief Convert an unsigned 16 bit unsigned integer in the
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* big endian format into a 16 bit unsigned integer in
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* the native CPU endian format.
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*
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* \param[in] x Value to swap
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*
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* \return Swapped value.
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*
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* \sa vmk_CPUToBE16
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*
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***********************************************************************
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*/
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static inline vmk_uint16
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vmk_BE16ToCPU(vmk_uint16 x)
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{
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return vmk_CPUToBE16(x);
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}
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#endif /* _VMKAPI_BITS_H_ */
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/** @} */
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/** @} */
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