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40 lines
1.2 KiB
C++
40 lines
1.2 KiB
C++
/* descriptor.cpp
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Copyright (c) 2013, Nikolaj Schlej. All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHWARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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*/
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#include "descriptor.h"
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// Calculate address of data structure addressed by descriptor address format
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// 8 bit base or limit
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UINT8* calculateAddress8(UINT8* baseAddress, const UINT8 baseOrLimit)
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{
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return baseAddress + baseOrLimit * 0x10;
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}
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// 16 bit base or limit
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UINT8* calculateAddress16(UINT8* baseAddress, const UINT16 baseOrLimit)
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{
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return baseAddress + baseOrLimit * 0x1000;
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}
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// Calculate offset of region using its base
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UINT32 calculateRegionOffset(const UINT16 base)
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{
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return base * 0x1000;
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}
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//Calculate size of region using its base and limit
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UINT32 calculateRegionSize(const UINT16 base, const UINT16 limit)
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{
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if (limit)
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return (limit + 1 - base) * 0x1000;
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return 0;
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} |