76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
// -*- C++ -*-
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// VisualBoyAdvance - Nintendo Gameboy/GameboyAdvance (TM) emulator.
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// Copyright (C) 1999-2003 Forgotten
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// Copyright (C) 2004 Forgotten and the VBA development team
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2, or(at your option)
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// 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,
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// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#ifndef VBA_PORT_H
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#define VBA_PORT_H
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// swaps a 16-bit value
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static inline u16 swap16(u16 v)
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{
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return (v<<8)|(v>>8);
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}
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// swaps a 32-bit value
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static inline u32 swap32(u32 v)
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{
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return (v<<24)|((v<<8)&0xff0000)|((v>>8)&0xff00)|(v>>24);
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}
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#ifdef WORDS_BIGENDIAN
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#if defined(__GNUC__) && defined(__ppc__)
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#define READ16LE(base) \
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({ unsigned short lhbrxResult; \
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__asm__ ("lhbrx %0, 0, %1" : "=r" (lhbrxResult) : "r" (base) : "memory"); \
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lhbrxResult; })
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#define READ32LE(base) \
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({ unsigned long lwbrxResult; \
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__asm__ ("lwbrx %0, 0, %1" : "=r" (lwbrxResult) : "r" (base) : "memory"); \
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lwbrxResult; })
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#define WRITE16LE(base, value) \
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__asm__ ("sthbrx %0, 0, %1" : : "r" (value), "r" (base) : "memory")
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#define WRITE32LE(base, value) \
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__asm__ ("stwbrx %0, 0, %1" : : "r" (value), "r" (base) : "memory")
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#else
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#define READ16LE(x) \
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swap16(*((u16 *)(x)))
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#define READ32LE(x) \
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swap32(*((u32 *)(x)))
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#define WRITE16LE(x,v) \
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*((u16 *)x) = swap16((v))
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#define WRITE32LE(x,v) \
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*((u32 *)x) = swap32((v))
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#endif
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#else
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#define READ16LE(x) \
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*((u16 *)x)
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#define READ32LE(x) \
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*((u32 *)x)
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#define WRITE16LE(x,v) \
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*((u16 *)x) = (v)
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#define WRITE32LE(x,v) \
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*((u32 *)x) = (v)
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#endif
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#endif
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