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/*========================== begin_copyright_notice ============================
Copyright (C) 2022 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#define sizeofbits(val) (8 * sizeof(val))
// === --------------------------------------------------------------------===
// === Bitfield accessors
// === --------------------------------------------------------------------===
ushort getBits16(ushort value, uint startBit, uint width)
{
ushort value_aligned = value >> startBit;
ushort mask = USHRT_MAX >> (sizeofbits(ushort) - width);
return value_aligned & mask;
}
uint getBits32(uint value, uint startBit, uint width)
{
uint value_aligned = value >> startBit;
uint mask = UINT_MAX >> (sizeofbits(uint) - width);
return value_aligned & mask;
}
ulong getBits64(ulong value, uint startBit, uint width)
{
ulong value_aligned = value >> startBit;
ulong mask = ULONG_MAX >> (sizeofbits(ulong) - width);
return value_aligned & mask;
}
// === --------------------------------------------------------------------===
// === Bitfield setters
// === --------------------------------------------------------------------===
//
// Example for startBit=2, width=3
// slotWidthMask = 00000111
// valueSlitMask = 11100011
ushort setBits16(ushort value, ushort slot, uint startBit, uint width)
{
ushort slotWidthMask = USHRT_MAX >> (sizeofbits(ushort) - width);
ushort valueSlitMask = ~(slotWidthMask << startBit);
return (value & valueSlitMask) | ((slot & slotWidthMask) << startBit);
}
uint setBits32(uint value, uint slot, uint startBit, uint width)
{
uint slotWidthMask = UINT_MAX >> (sizeofbits(uint) - width);
uint valueSlitMask = ~(slotWidthMask << startBit);
return (value & valueSlitMask) | ((slot & slotWidthMask) << startBit);
}
ulong setBits64(ulong value, ulong slot, uint startBit, uint width)
{
ulong slotWidthMask = ULONG_MAX >> (sizeofbits(ulong) - width);
ulong valueSlitMask = ~(slotWidthMask << startBit);
return (value & valueSlitMask) | ((slot & slotWidthMask) << startBit);
}
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