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125 lines
2.2 KiB
125 lines
2.2 KiB
// TITLE("Byte Swap Functions")
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//++
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//
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// Copyright (c) 1998 Intel Corporation
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// Copyright (c) 1997 Microsoft Corporation
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//
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// Module Name:
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//
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// byteswap.s
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//
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// Abstract:
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//
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// This module implements functions to perform byte swapping operations.
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//
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// Author:
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//
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// William Cheung (v-willc) 30-Nov-1998
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//
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// Environment:
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//
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// User or Kernel mode.
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//
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// Revision History:
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//
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//--
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#include "ksia64.h"
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SBTTL("RtlUshortByteSwap")
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//++
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//
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// USHORT
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// RtlUshortByteSwap(
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// IN USHORT Source
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// )
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//
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// Routine Description:
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//
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// The RtlUshortByteSwap function exchanges bytes 0 and 1 of Source
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// and returns the resulting USHORT.
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//
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// Arguments:
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//
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// Source (a0[0..15]) - 16-bit value to byteswap.
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//
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// Return Value:
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//
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// The 16-bit integer result is returned as the function value
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// in v0[0..15].
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//
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//--
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LEAF_ENTRY(RtlUshortByteSwap)
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shl t0 = a0, 48
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;;
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mux1 v0 = t0, @rev
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br.ret.sptk brp
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LEAF_EXIT(RtlUshortByteSwap)
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SBTTL("RtlUlongByteSwap")
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//++
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//
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// ULONG
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// RtlUlongByteSwap(
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// IN ULONG Source
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// )
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//
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// Routine Description:
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//
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// The RtlUlongByteSwap function exchanges byte pairs 0:3 and 1:2 of
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// Source and returns the the resulting ULONG.
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//
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// Arguments:
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//
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// Source (a0[0..31]) - 32-bit value to byteswap.
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//
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// Return Value:
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//
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// The 32-bit integer result is returned as the function value
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// in v0[0..31].
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//
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//--
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LEAF_ENTRY(RtlUlongByteSwap)
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shl t0 = a0, 32
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;;
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mux1 v0 = t0, @rev
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br.ret.sptk brp
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LEAF_EXIT(RtlUlongByteSwap)
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SBTTL("RtlUlonglongByteSwap")
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//++
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//
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// ULONG
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// RtlUlonglongByteSwap(
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// IN ULONGLONG Source
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// )
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//
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// /*++
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//
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// Routine Description:
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//
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// The RtlUlonglongByteSwap function exchanges byte pairs 0:7, 1:6, 2:5,
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// and 3:4 of Source and returns the resulting ULONGLONG.
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//
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// Arguments:
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//
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// Source (a0[0..63]) - 64-bit value to byteswap.
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//
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// Return Value:
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//
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// Swapped 64-bit value.
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//
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//--
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LEAF_ENTRY(RtlUlonglongByteSwap)
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mux1 v0 = a0, @rev
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br.ret.sptk brp
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LEAF_EXIT(RtlUlonglongByteSwap)
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