122 lines
3.0 KiB
C++
122 lines
3.0 KiB
C++
/******************************************************************************/
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/* Mednafen Sony PS1 Emulation Module */
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/******************************************************************************/
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/* masmem.h:
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** Copyright (C) 2012-2016 Mednafen Team
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** as published by the Free Software Foundation; either version 2
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** of the License, or (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software Foundation, Inc.,
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** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __MDFN_PSX_MASMEM_H
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#define __MDFN_PSX_MASMEM_H
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// address must not be >= size specified by template parameter, and address must be a multiple of the byte-size of the
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// unit(1,2,4) being read(except for Read/WriteU24, which only needs to be byte-aligned).
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//
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template<unsigned size, bool big_endian> //, unsigned pre_padding_count, unsigned post_padding_count>
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struct MultiAccessSizeMem
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{
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//uint8 pre_padding[pre_padding_count ? pre_padding_count : 1];
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union
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{
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uint8 data8[size];
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uint64 alignment_dummy[1];
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};
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//uint8 post_padding[post_padding_count ? post_padding_count : 1];
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template<typename T>
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INLINE T Read(uint32 address)
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{
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return MDFN_deXsb<big_endian, T, true>(data8 + address);
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}
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template<typename T>
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INLINE void Write(uint32 address, T value)
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{
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MDFN_enXsb<big_endian, T, true>(data8 + address, value);
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}
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INLINE uint8 ReadU8(uint32 address)
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{
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return Read<uint8>(address);
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}
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INLINE uint16 ReadU16(uint32 address)
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{
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return Read<uint16>(address);
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}
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INLINE uint32 ReadU32(uint32 address)
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{
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return Read<uint32>(address);
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}
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INLINE uint32 ReadU24(uint32 address)
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{
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uint32 ret;
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if(!big_endian)
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{
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ret = ReadU8(address) << 0;
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ret |= ReadU8(address + 1) << 8;
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ret |= ReadU8(address + 2) << 16;
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}
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else
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{
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ret = ReadU8(address) << 16;
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ret |= ReadU8(address + 1) << 8;
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ret |= ReadU8(address + 2) << 0;
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}
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return(ret);
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}
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INLINE void WriteU8(uint32 address, uint8 value)
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{
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Write<uint8>(address, value);
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}
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INLINE void WriteU16(uint32 address, uint16 value)
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{
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Write<uint16>(address, value);
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}
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INLINE void WriteU32(uint32 address, uint32 value)
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{
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Write<uint32>(address, value);
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}
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INLINE void WriteU24(uint32 address, uint32 value)
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{
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if(!big_endian)
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{
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WriteU8(address + 0, value >> 0);
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WriteU8(address + 1, value >> 8);
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WriteU8(address + 2, value >> 16);
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}
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else
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{
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WriteU8(address + 0, value >> 16);
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WriteU8(address + 1, value >> 8);
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WriteU8(address + 2, value >> 0);
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}
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}
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};
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#endif
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